WO2003104892A1 - 画像投射装置及び画像投射方法 - Google Patents
画像投射装置及び画像投射方法 Download PDFInfo
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- WO2003104892A1 WO2003104892A1 PCT/JP2003/007372 JP0307372W WO03104892A1 WO 2003104892 A1 WO2003104892 A1 WO 2003104892A1 JP 0307372 W JP0307372 W JP 0307372W WO 03104892 A1 WO03104892 A1 WO 03104892A1
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- area
- intrusion
- light
- image projection
- detection
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2086—Security or safety means in lamp houses
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
Definitions
- the present invention relates to a technique for sufficiently taking safety measures in an image projection device and an image projection method configured using a high-intensity light source.
- a safety mechanism is indispensable.However, the provision of such a mechanism complicates the projection optical system, etc., or causes a significant increase in the cost of the device. If it occurs, it may be a factor that hinders its spread. In addition, delays in the operation of safety mechanisms are not allowed, and promptness is required for intrusion detection.
- the present invention provides an image projection apparatus having a function of projecting and displaying an image on a screen, improving safety when a human body or the like enters a projection range of irradiation light, and, for that purpose, has a complicated configuration.
- the task is to avoid the need for such changes. Disclosure of the invention
- an image projection device includes: a detection wave source provided on a surface of a device main body facing a screen or on a screen; And a reflected wave detecting means for detecting a reflected wave reflected by the monitoring area after a detection wave is emitted to a monitoring area located at a distance from the monitor area.
- the detection level by the reflected wave detecting means is set to a predetermined threshold or It is configured to detect intrusion into the monitoring space surrounded by the detection wave based on the result of comparison with the reference range.
- the image projection method defines a monitoring area located outside the projection area on the screen located at a distance from the image projection apparatus, A detection wave is emitted from a detection wave source provided on a front surface of the image projection device, and a reflected wave from the monitoring area is emitted. Detecting the intrusion into the surveillance space surrounded by the detection wave, and blocking the light irradiated toward the projection area or reducing the intensity of the light according to the intrusion state.
- a detection wave source facing the screen is provided, and a reflected wave emitted from the detection wave source and reflected on the monitoring area is detected, thereby making it possible to easily enter the monitoring space. Can be detected with. Then, when intrusion into the monitoring space is detected, it is possible to prevent the human body from being exposed to danger by blocking the irradiation light to the projection area or reducing the light intensity.
- FIG. 1 is a schematic diagram showing a basic configuration example of an image projection device according to the present invention.
- FIG. 2 is an explanatory diagram exemplifying each projection area and monitoring area on the screen.
- FIG. 3 is a diagram for explaining the intensity distribution of a detection wave applied to the periphery of the screen.
- FIG. 4 is a flowchart for explaining safety measures in the image projection apparatus.
- FIG. 5 is a diagram for describing a configuration example of the image projection device, and is a diagram illustrating an example of the arrangement of the projector device and the screen unit.
- FIG. 6 is a front view of the projector device shown in FIG.
- FIGS. 7A to 7D are diagrams illustrating an example of an infrared irradiation unit.
- FIGS. 8A to 8B are diagrams illustrating an irradiation example of the infrared irradiation unit.
- FIG. 9 is a diagram showing a configuration example of a projection system.
- FIG. 10 is a flowchart showing a processing example of the intrusion detection and danger prevention control unit.
- FIG. 11 is a graph showing an example of elapse of time with respect to the power level of laser light.
- FIG. 12 is a graph illustrating the relationship between the infrared intensity and the distance.
- FIG. 13A to FIG. 13C are diagrams for explaining a method of setting a projection range and a monitoring area of a detection wave.
- FIG. 14 is a diagram showing another example of the configuration of the projection system.
- FIGS. 15A to 15B are diagrams showing the positional relationship between the projector device shown in FIG. 14 and the screen.
- FIG. 16 is a flowchart illustrating an alarm operation in the projector device of FIG.
- FIG. 17 is an explanatory diagram exemplifying a detection area of the second detection means for detecting intrusion into the second monitoring space.
- FIG. 18 is an explanatory view exemplifying another detection area for the second detection means.
- FIG. 19 is an explanatory diagram exemplifying a detection area when an ultrasonic sensor is used as the first detection means for detecting intrusion into the first monitoring space.
- FIG. 20 is an explanatory diagram showing another example of the first detecting means.
- An object of the present invention is to guarantee safety in an image projection apparatus by immediately blocking light or reducing light intensity when an obstacle enters a projection area of irradiation light (laser light or the like).
- FIG. 1 schematically shows an example of a basic configuration of an image projection device according to the present invention, and shows an example of a device using a laser light source (eg, a laser projector device).
- the image projection device 1 includes a light source la for displaying an image by projecting onto a projection area 3 on a screen 2 located at a fixed distance from the device main body, and a projection unit 1b including a projection lens.
- a configuration is known that includes a laser light source (a laser light source for each color of RGB) and an optical module (modulation means), and has a function of projecting an image on the screen 2 using laser light.
- the optical module is equipped with a modulator and an optical system for modulating each color of RGB laser light according to the image signal.
- the laser light is modulated according to the image signal.
- the scanning (sweep) is performed by a galvanomira or the like that constitutes the above.
- the optical module includes a projection optical system including an objective lens for projecting the laser light of each color onto the screen 2 , and the laser light of each color swept by the optical scanning means is used to project the laser light of each color.
- the light is irradiated on the screen 2 via the optical system.
- the present invention is not limited to a projector device that modulates illumination light with a video signal and projects it on a screen, but can be applied to projector devices having various configurations.
- the light source la a configuration using a discharge lamp or a light emitting tube having high light intensity or luminance can be cited.
- a laser light source compared with the case using a projection tube, etc. It has excellent characteristics in terms of brightness and color reproducibility, and easily modulates video signals.
- a laser light source is used as described above, take safety measures against the intrusion of the human body, etc. from the projection section 1b into the irradiation light passage area from the projection section 1b toward the projection area 3 on the screen. It is necessary (for example, to block laser light or reduce the light intensity).
- a rectangular frame “LA” indicated by a solid line on the screen 2 indicates an outer frame of the laser light projection area 3, and an image is projected and displayed in the area.
- a safety mechanism is provided for detecting the intrusion into the set area (monitoring space) using the detected wave.
- the reflected wave of the detected wave is detected.
- the intrusion detection means using the detection wave is provided with a detection wave source 1c and a reflected wave detection means 1d.
- the detection wave source 1c is provided on the front surface of the device main body facing the screen 2 or on the screen.
- a safe light source such as a light emitting diode (LED) is used as an infrared light source or an infrared light source. Can be used (there is no safety problem if infrared light enters the viewer's eyes).
- a detection wave 4 (see a two-dot chain line in FIG. 1) emitted from the detection wave source 1 c is irradiated toward the screen 2.
- a rectangular frame IR indicated by a broken line on the screen 2 indicates a projection area of the detection wave. In this example, it is a quadrilateral area located outside the laser light projection area 3 and slightly larger than the area.
- the reason that the size (angle of view) of the detection wave projection area (rectangular frame IR) is set to be larger than that of the laser light projection area 3 is that a viewer or the like enters the projection area 3 before entering. This is because of the need to detect that.
- the reflected wave detecting means Id is provided for detecting the reflected wave of the detected wave from the screen. That is, from the detection source 1 c to the outside of the projection area 3 After a detection wave is emitted to a predetermined area (see monitoring area 6 in FIG. 2) located at a distance, the reflected wave reflected by the area is detected.
- a detection wave is emitted to a predetermined area (see monitoring area 6 in FIG. 2) located at a distance
- an imaging element a CCD type, a CM-S type image sensor, or the like
- the reflected wave sensor may be used as the reflected wave sensor.
- the detection wave source 1c and the reflected wave detection means 1d are arranged around a projection unit 1b provided on the surface facing the screen 2 (the front surface of the device body). As shown in this example, if the configuration is such that the reflected wave detection means 1 d is located near the projection unit 1 b and the detection wave source 1 c is arranged so as to surround them, the size and size of the device can be reduced. It is advantageous for conversion.
- the reflected wave detection means 1 d by providing the reflected wave detection means 1 d near the projection unit 1 b, it is possible to reduce the probability of occurrence of erroneous detection or the like (for example, the reflected wave detection means I d is used for the projection unit 1 b If it is too far away, detection unrelated to the projection will be performed, and if the intrusion detection responds to this, there is a risk that the safety mechanism will be activated unnecessarily.) In addition, by using a method such as modulating the detection wave, it is possible to increase the detection accuracy or prevent erroneous detection.
- FIG. 2 exemplifies a relationship between a projection area 3 of a laser beam, a projection area 5 of a detection wave (indicated by a broken line), and a monitoring area 6 on the screen 2.
- the monitoring area 6 is set at a position substantially corresponding to the projection area 5, but the width of the monitoring area 6 is narrower than the projection area 5.
- the monitoring area 6 is composed of four areas 6A to 6D each having a predetermined width corresponding to each side of the rectangular frame (quadrilateral), but is not limited thereto.
- the present invention can be implemented in various forms using the monitoring area.
- area 6A is the left side of the quadrilateral
- area 6B is the upper side of the quadrilateral
- area 6C is the right side of the quadrilateral
- area 6 D constitutes the lower side of the quadrilateral.
- Monitoring is performed based on the acquired data relating to the range (detection range) detected by the reflected wave detection means 1d corresponding to each of the regions. For example, in the case of using an infrared light or infrared reflected wave sensor, an image sensor, or the like, intrusion monitoring is performed by a process using pixel data constituting a detection image of each component area.
- the intrusion speed expected from the movement of the human body and the intrusion of the human body and obstacles are detected. Is determined based on the relationship with the time required until the laser beam is cut off or dimmed afterwards (that is, if this distance is too short, the laser beam will not be cut off or dimmed after intrusion detection It is necessary to set the distance (interval) appropriately because there is a possibility that the monitoring area 6 will be lost.)
- the monitoring area 6 for example, the following forms are available.
- image projection is performed in a state where the projection area 3 is located in the high reflectivity area of the screen 2, and is usually slightly smaller than its maximum size (the size of the white background). Therefore, the positions of the areas 6A to 6D are set on the outer periphery of the projection area 3. In other words, while the high reflectivity range on the screen 2 can be used as it is, the presence of the monitoring area 6 affects the image size of the projection area 3 and the display range is slightly narrowed.
- a retroreflective sheet or the like is pasted on the periphery of the screen (black background, etc.) and this area is used as a monitoring area, so that an image can be displayed on the entire screen.
- the monitoring area 6 is set to a size and position larger than the projection area 3 based on the measured value of the distance from the image projection device 1 to the screen 2 and the F value of the projection lens. In that case, instead of irradiating the irradiation light with high light intensity to the projection area 3 first, first irradiate the irradiation light with sufficient brightness for the eyes to the projection area 3 and observe the angle of view.
- the size and position of the monitoring area 6 are set.
- FIG. 3 schematically shows the intensity distribution of the detected wave.
- a graph curve 7 showing the intensity distribution represents the intensity of the detected wave in the direction indicated by arrow L, and the direction orthogonal to the direction. Indicates the position on the screen 2.
- the detection wave is emitted from the outer shape of the projection area 3 to the outside of the area at a distance indicated by “W”, but slightly wider than the width of the monitoring area 6 (6 A to 6 D width).
- the intensity is substantially constant at a predetermined level or higher, and the intensity gradually decreases toward the inside or outside of the screen 2 from the range.
- the width of the monitoring area 6 is too large compared to the width of the projection area 5, the lower part of the detected wave intensity will fall on the monitoring area 6, causing the intensity to become unstable or necessary for detection. Problems such as insufficient SZN (signal-to-noise) ratio occur.
- the width of the monitoring area 6 is within a substantially constant level range within the projection area 5 of the detection wave when the intensity of the detection wave is equal to or higher than a predetermined level when viewed from the direction facing the screen 2. It is preferable to set so as to fall within (flat area). Next, the monitoring process will be described.
- Each component area of the monitoring area is monitored as an image detected by the reflected wave detecting means Id, for example.
- the intensity of the reflected wave shall be indicated according to the specified gradation expression.
- the detected wave is applied to the projection area 5 on the screen 2 and reflected by the screen, and the intensity of the reflected wave is recognized as data of each pixel constituting the detection image of the monitoring area.
- the reference range of the reflected wave intensity based on the pixel data is set in advance, and the actual reflected wave intensity is Inspection detection can be determined by examining whether or not it is within the reference range. If the reference range is stipulated to be 70 to 120, the actual reflected wave intensity is less than the reference range (0 to 69) or exceeds the reference range (121 to 255) ), It is recognized that the detected wave is blocked at the pixel indicating the data, or conversely, it is too bright.
- the predetermined number of pixels for example, 6 pixels or more out of the 1200 pixels related to the monitoring area
- the change in the detected value of the reflected wave intensity based on each pixel data is caused by the detection wave being interrupted by the intrusion of a human body or an obstacle or by directly reflecting the detection wave.
- the detection level by the reflected wave detection means 1d is compared with a predetermined threshold value or reference range, and based on the comparison result, it is possible to detect intrusion into the monitoring space surrounded by the detection wave.
- This “detection” includes not only the presence or absence of a human body or an object, but also the detection of the size or the moving direction. As described above, it is effective to detect not a whole detected image but a part of an image corresponding to a monitoring area by level comparison, and does not require complicated and time-consuming image processing.
- the reflected wave detecting means J ⁇ d is the monitoring area 6 (6 A to 6
- the reflected wave detecting means 1 d measures the intensity of the reflected wave from the screen 2 at each pixel in the monitoring area 6, and for example, the intensity of the detected wave reflected by the invasion of a human body or an obstacle is determined by the When there is no such intrusion, it detects that the reflected wave intensity differs from the screen or reflective member (retroreflective sheet, etc.). Then, when an abnormality including a decrease or increase in intensity is detected in any of the monitoring areas, irradiation light (eg, laser light) is cut off or dimmed.
- irradiation light eg, laser light
- FIG. 4 is a flowchart for explaining an example of safety measures for the image projection device 1.According to the present algorithm, it is sufficient for human eyes until the safety of laser beam projection is confirmed. By performing projection with laser light of a safe intensity, it is possible to prevent an accident when a person accidentally enters the projection range of the laser light.
- (S 6) Irradiate laser light with specified brightness.
- the laser light is cut off or dimmed, and the intensity of the laser light is reduced to a safe level as in (S 2). descend.
- the intensity of the illuminating light is reduced to a level that is not dangerous to the human body until it is confirmed that no intrusion into the surveillance space surrounded by the detection wave, especially no human intrusion, is detected. It is desirable to control the projector so that the intensity of the illuminating light is increased to the specified level after image projection is performed and safety is sufficiently confirmed. Then, after confirming that no human body or obstacle has entered the monitoring space in the image projection device 1, the user (operator of the device) confirms that no human body or obstacle has entered the projection area 3 just in case. It is possible to further enhance safety by first increasing the projecting power of irradiation light by inserting a dedicated switch after confirmation.
- the above (S2) to (S4) can be performed manually or automatically, but automation is preferable from the viewpoint of user convenience.
- the previous adjustment and setting status are stored in the storage means in the device together with the conditions at that time (projection angle of view, projection distance, etc.), and when the device is started next time, the previous storage information can be obtained from the current status. It is preferable to check with the information. For example, when the collation result is acceptable (that is, when there is not much difference from the previous state), the process proceeds from the above (S2) to (S5). Is configured so that adjustments and settings are restarted from the beginning.
- FIGS. 5 to 20 An example of a projector device having functions of intrusion detection and danger prevention will be described with reference to FIGS. 5 to 20. It should be noted that a form in which a human enters the area where the projected light beam (laser light) passes is detected, and a form in which the light ray is prevented from entering the human eye or a form in which the light intensity is reduced to such a degree that there is no danger. It can be applied to
- FIG. 5 is a perspective view showing a projector device main body and a screen.
- the projector device has a device main body 1A and an image pickup means 100 such as a CCD image sensor mounted thereon. (Corresponding to the above-mentioned reflected wave detecting means 1d).
- a screen 40 is arranged in front of the projector device, and a projection area 42 of an image is defined on the surface of the screen 40.
- a rectangular monitoring area 46 is formed in a peripheral area 44 of the area. Stipulated.
- the monitoring area 46 is composed of monitoring areas 46A to 46D corresponding to the respective sides of the quadrilateral.
- FIG. 6 is a front view of the apparatus main body 1A, showing a projection lens 32, imaging means 100, and infrared irradiation means 120 (120A to 120D).
- a projection lens 32 is located at the center of the front of the main unit 1A, and an image is projected from the projection lens 32 onto a projection area 42 on the screen 40. (The projection lens 32 adjusts the focal length. It is possible.)
- Infrared irradiating means 120 is located at the peripheral edge of the front surface of the apparatus main body 1A.
- FIG. 7A to 7D illustrate one of the infrared irradiation parts (12 OA).
- FIG. 7A is a front view
- FIG. 7B is a side view showing one light emitting element.
- 7C and 7D are explanatory diagrams of the infrared irradiation angle.
- Each of the infrared irradiation sections 120A to 120D has the same configuration, and as shown in FIG. 7A, a plurality of light emitting elements (for example, infrared Are arranged in two stages in the direction perpendicular to the longitudinal direction (vertical direction in the figure).
- each light emitting diode is provided with a correction lens “LN S” on the front surface thereof.
- LN S correction lens
- the divergence angle (elevation angle) with respect to the optical axis direction in the vertical plane including the optical axis of the correction lens is set to 2 °.
- the divergence angle with respect to the optical axis direction in the horizontal plane is set to 34 °, and the divergence angle is set to the monitoring area (for example, 46 A) corresponding to each infrared ray irradiation unit. Irradiates with infrared light.
- each infrared irradiating section is the same.
- four sides are compared with infrared irradiating sections 120 A and 120 C located on the long side of the quadrilateral.
- Infrared irradiating sections 120B and 120D located on the short side of the shape may use a small number of elements.
- a tilt mechanism is provided for each infrared irradiator so that the irradiation angle toward the screen 40 can be adjusted manually or automatically.
- the irradiation direction and range of the infrared irradiation units 120A to 120D are adjusted. It is preferable to adjust the focal length of the projection lens 32 or the like.
- Projection devices are often used in various situations.For example, when the projection distance is 3 m and the projection lens 32 and the projection area 42 of the screen 40 are in a horizontal positional relationship, Various situations are possible, such as when the projection distance is 5 m and the projection image is emitted upward from the projection lens 32 to the projection area 42 (the direction and focal length of the projection lens 32 can be adjusted.
- 8A to 8B are diagrams for explaining the irradiation direction and irradiation width related to the infrared irradiation section, and taking the infrared irradiation section 120A as an example, the side orthogonal to the vertical plane. This shows a state of entanglement.
- the vertical and horizontal divergence angles and infrared irradiation width can be adjusted and set according to the distance between the main unit 1A and the screen 40.
- infrared irradiation The light path from the unit 120A (infrared light beam) is converted into a substantially parallel light beam to irradiate the monitoring area 46A.
- Fig. 8B the infrared irradiation unit 1
- the intensity distribution of the infrared rays radiated to the peripheral area 44 of the screen by each infrared irradiating section is as described in FIG.
- the graph curve 7 in FIG. 3 represents the intensity of infrared rays
- the monitoring area 46 is located within the range on the screen 40 corresponding to the range of the intensity peak (flat portion).
- the value of the distance ⁇ W '' is 10 cm
- the width of each monitoring area 46 A to 46 D can be the same, or the width can be changed individually as needed It is.
- the imaging unit 100 captures an image of the screen 40 including the monitoring area 46, and a filter is provided on the front of the imaging unit 100 to transmit only infrared components during normal operation of the projector device.
- the infrared rays reflected from the area including the area 46 are detected (however, it is necessary to remove the filter in the adjustment step described later).
- the infrared image (detected image by infrared light transmitted through the filter) detected by the imaging means 100 is subjected to signal processing by an intrusion detection and danger prevention control unit 110 described later.
- FIG. 9 is a block diagram showing an example of the configuration of the projection system.
- the power supply device 130 supplies power to the infrared irradiation units 120A to 120D, and receives commands from the intrusion detection and danger prevention control unit 110 and supplies them to each infrared irradiation unit. Power to be applied can be changed. Thereby, it is possible to adjust and set the output level of the light emitting element group constituting each infrared irradiation unit.
- the intrusion detection and danger prevention control unit 110 constitutes intrusion detection means, and is configured using, for example, a computer (including a memory and a display device), a dedicated circuit, and the like.
- the light modulation unit 10 includes a light source unit 12, an illumination light generation unit 14, and a spatially modulated light generation unit 16.
- the light source section 12 has a green laser diode LD (G), a blue laser diode LD (B), and a red laser diode LD (R), and each laser diode is supplied with power from a power supply device 52 of a power supply system 50. Then, the laser beam of each color is emitted.
- G green laser diode LD
- B blue laser diode
- R red laser diode
- the power supply system 50 includes a power supply device 52 for outputting a voltage and a current for driving the laser to the light source section 12 and a regi- ure unit 54. It is configured so that the output level of the power supply unit 52 can be adjusted. (For output adjustment, the output from the power supply unit 52 is output to the light source unit 12 according to the command of the intrusion detection and danger prevention control unit 110. Current, etc., can be arbitrarily adjusted over the range from zero to the maximum allowable value.)
- the illumination light generators 14 are provided to receive the R, G, and B laser beams emitted from the light source unit 12 and generate parallel illumination light, respectively.
- the green illumination optical units LG (G) and blue It has an illumination optical section LG (B) and a red illumination optical section LG (R).
- the spatially modulated light generator 16 includes light modulating means.
- a one-dimensional light modulating element called a grating light valve (GLV) is used.
- the element is configured using a phase diffraction grating capable of electrically controlling light on / off (used for digital image display).
- a GLV (G) for green, a GLV (B) for blue, and a GLV (R) for red are provided for each color light from the illumination light generation unit 14, respectively. Also has the Compiler "MX".
- the GLV of each color has a value corresponding to the video signal (VID EO) processed by the signal processor 60.
- the drive signals for modulation are supplied from the driver circuits 64, respectively, and the light from the illumination light generation unit 14 is modulated according to the video signal VIDE # and output.
- the complier “M X” is a unit (image combining unit) for combining light of each color GLV, and the output light is emitted to the light adjustment unit 20 at the subsequent stage.
- the light adjusting section 20 has an Offner relay optical system 22 and a diffuser optical system 24 and adjusts image light from the spatially modulated light generating section 16.
- the light projecting unit 30 located downstream of the light adjusting unit 20 includes a projection lens 32 and a scanner 34, and constitutes a means for projecting an image on a screen.
- a projection screen 40 is arranged in front of the light projection unit 30, and an image corresponding to the video signal VIDEO is projected on the screen 40 by a scanner 34 provided with a deflecting unit such as a galvano mirror.
- the scanner 34 is disposed after the projection lens 32.
- the scanner 34 may be arranged in various forms such as a configuration in which the positional relationship between the two is reversed (a configuration in which enlarged projection is performed after scanning). Can be implemented.
- the signal processing section 60 includes a video signal processing section 62, a driver circuit 64, an overall control section 66, and a scanner control section 68.
- the video signal processing unit 62 receives a video signal VIDEO from a video source device (computer, recording / reproducing device, etc.) (not shown), and outputs each GLV of the spatially modulated light generation unit 16 via a driver circuit 64. Signal processing is performed to control and generate a signal that modulates the illumination light (laser light). Then, the driver circuit 64 receives the output signal of the video signal processing unit 62, sends out a drive signal to each color GLV, and drives each element.
- a video signal VIDEO from a video source device (computer, recording / reproducing device, etc.) (not shown) (not shown) (not shown), and outputs each GLV of the spatially modulated light generation unit 16 via a driver circuit 64. Signal processing is performed to control and generate a signal that modulates the illumination light (laser light). Then, the driver circuit 64 receives the output signal of the video signal processing unit 62, sends out a drive signal to each color GLV, and drives each element.
- the scanner controller 68 is provided for controlling the rotation of the scanner 34, and is under the control of the overall controller 66.
- the entire system control unit 66 controls the scanner in accordance with a signal from the driver circuit 64. It issues commands to the control unit 68 and supervises overall video signal processing and projection control.
- FIG. 10 is a flowchart showing an example of the processing in the intrusion detection and danger prevention control unit 110.
- the processing steps S1 to S6 are as follows.
- (S 1) to (S 5) relate to the initial adjustment, and (S 6) is set when the apparatus is started up and used after the initial adjustment.
- (S 2) and (S 3) both show steps related to laser beam irradiation adjustment, and at (S 2) “class 1” irradiation level, the intensity was reduced to a level that was safe enough for the eyes.
- the irradiation level of “Class 3R” in (S3) is the intensity used in the normal operation of the projector device (see “JISC6802” for the laser safety standard).
- S1 to S6 will be described with reference to FIG.
- FIG. 11 illustrates the time change on the horizontal axis with time and the vertical axis on the irradiation level of the laser beam.
- T2 is as follows.
- ⁇ "T3" when a human body or obstacle begins to enter the monitored space
- T 2 Intrusion time of the human body and obstacles into the monitoring space ( ⁇ 2> ⁇ 1)
- APR Au to Power Reduction
- ⁇ N means the operating state of the mechanism
- ⁇ FF means the release of blocking of the laser beam after the operation of the mechanism.
- step S1 the operator operates the power switch 140 (see FIG. 9) of the projector device to turn on the switch at time t1 and instructs the projector device to start.
- power is supplied to each unit of the projector device.
- the illumination is performed in a state where there is no video. (However, in this state, the light is always projected from the projection lens 32 onto the projection area 42 correctly. Note that this is not the case.)
- the irradiation level (power) of the laser light is increased to class 1. That is, at time t1, when a signal indicating that the power switch 140 is on is input to the intrusion detection and danger prevention control unit 110, power control for the light source unit 12 is performed. Laser light with class 1 power is emitted. Then, the position adjustment on the screen is performed. Immediately after the main unit 1A of the projector device and the screen 40 are installed, the infrared irradiation units 120A to 120D and the monitoring area 46A to Infrared rays directed toward 46D do not always correctly illuminate the intended location.
- the focal length of the projection lens 32 is adjusted by means or automatically as necessary.
- the direction of the main unit 1A and the projection lens are set so that the light from the projection lens 32 is applied to the area corresponding to the projection area 42 in the screen 40. 3 Adjust the focal length and so on. Then, after the position of the projection area 42 on the screen 40 is determined, the irradiation area on the screen from each infrared irradiator 120 A to 120 D and each monitoring area 46 A to 46 D The two are aligned so that and have the corresponding positional relationship.
- the adjustment of the projection distance, the display position, the image size, etc., the alignment between the infrared irradiation range and the monitoring area, etc. were performed using the imaging means 100 and the projection lens 32 onto the screen 40.
- the projected light and the projected light of the light emitting diode constituting each infrared irradiating unit an image is taken as reflected light thereof, and the image signal is input to the intrusion detection and danger prevention control unit 110, and signal processing is performed here.
- the infrared transmission filter visible light cut filter
- FIG. 12 is a graph illustrating the relationship between the power of an infrared LED and the distance.
- cornea contact Keru for direct eye exposure MPE Maximum Permiss ible Exposure
- the wavelength lambda 8 8 0 nm
- the irradiation time t 3 X 1 0- 4 seconds (0 . when 3m s)
- 0. 7 is 3 3m WZcm 2
- the power of the infrared light in the monitoring area 46 is about 0 15 mWZcm 2
- the infrared light in the monitoring area 46 is The irradiation width is 5 cm.
- the power of infrared light in the monitoring area 46 is about 0.05 4 mWZ cm 2 , and the infrared irradiation width in the monitoring area 46 is 5 cm.
- Figures 13A to 13C show the adjustment and confirmation of the positional relationship between each projection area by the infrared irradiation unit 120A to 120D and the monitoring area 46A to 46D. It is a figure for explaining processing.
- the imaging result of the imaging means 100 stored in the memory of the intrusion detection and danger prevention control unit 110 is illustrated.
- the display state is displayed on a display device that does not have an infrared irradiation unit 120A to 120D to check the irradiation state of the monitoring areas 46A to 46D.
- Fig. 13A shows the initial state immediately after the projection area 42 is set.
- the numerical value indicates that they are separated from each other.
- the imaging means 100 captures an image of the reflection of the light of the infrared irradiating units 120A to 120D applied to the screen 40 through an infrared transmission filter.
- the width of the monitoring area is 5 cm, and the width direction corresponds to data for 6 pixels, and the length of each area 46 A and 46 C in the longitudinal direction of the monitoring area 46 shown in the figure.
- each pixel data is represented, for example, as data of 256 gradations.
- the intrusion detection and danger prevention control unit 110 processes the imaging data input from the imaging means 100 0 by signal processing, and sets pixel data relating to the projection range 46 a to 46 d to a threshold value, for example, 50 at 2
- the pixel data of 50 or more is distinguished as a logical value of ⁇ 1 '' and the pixel data of less than 50 as a logical value of ⁇ 0 '', and the projection area 42 and the projection range 46 a to 46 d are distinguished. Display on the display screen. that time.
- the distance between the projection area 42 and the projection units 46a to 46d is calculated and displayed as distances d1 to d4.
- the W value is set to 10 cm, and therefore, the tilt angles of the infrared irradiators 120 A to 120 D are adjusted so that the distances dl to d 4 are all about 10 cm. .
- Fig. 13B shows a state in which the light from the infrared irradiators 120A and 120C is projected onto the areas 46A and 46C, which are 10cm away from the upper and lower edges of the projection area 42. Indicates that the adjustment has been made. Also, Fig. 13C shows that the light from the infrared irradiating sections 120B and 120D is projected into the areas 46B and 46D, which are 10cm apart from the left and right edges of the projection area 42. This indicates that the projector has been adjusted to the projected state.
- W 10 cm is merely an example, and it is needless to say that it is necessary to appropriately set the position of the infrared light and the projection range of the infrared light and the monitoring area according to a change in the angle of view due to zooming. .
- the laser power of class 1 at time t 2 rises to class 3 R ( at time t 2, It is necessary to set the APR to operate and enable the function of the safety mechanism.
- the reflected light (infrared light) relating to each of the monitoring areas 46A to 46D is received by the imaging means 100.
- the intrusion detection and danger prevention control unit 110 acquires the detection level of the reflected light imaged by the imaging unit 100 from the pixel data, compares the level with the reference range, and determines whether the level is within the allowable range. Check whether or not. For example, Assuming that each pixel data is represented by 256 gradations, the data is binarized by comparison with a threshold value. Pixel data above the threshold is a logical value
- the detection level of the image sensor (CCD type image sensor) with respect to various reflecting surfaces was the value shown in Table 1 below.
- the above threshold value is preferably determined according to the material used for the screen 40.For example, if the material of the screen 40 is a white mat screen, white paper, or the like, it may be set to about 55. For example, it can be distinguished from Japanese skin, which is one of the intrusion detection targets.
- the passing range of the infrared light projected from the infrared irradiating unit 120A to 120D toward each of the monitoring areas 46A to 46D (the truncated pyramid detection range) Test to check the passage of obstacles to
- obstacles are put in and out of the detection range surrounded by the infrared light, and based on the detected image data of the imaging means 100 relating to the monitoring areas 46A to 46D.
- test method for each monitoring area, a person's finger or an object such as a glossy black ruler is taken in and out of the detection range, and the detection signal level is reduced. Check.
- the intrusion detection and danger prevention control unit 110 performs control so as to emit an audible alarm when an obstacle enters the above detection range (an output signal is sent to an alarm device not shown). ). As a result, the operator can hear and confirm that the failure has been normally detected.
- the intrusion detection and danger prevention control unit 110 can display a part corresponding to an obstacle in a display device (not shown) in red or the like, if necessary. For the area, the detected image is displayed in, for example, white.)
- the intrusion detection and danger prevention control unit 110 can also store the data at this time in a memory.
- the intrusion detection and danger prevention control unit 110 drives the power supply unit 5 Very low power from 2 to the light source 1 2 It is desirable to reduce the power to a lower level or to stop the power supply from the power supply unit 52 to the light source unit 12.
- the operator gives an instruction to the intrusion detection and danger prevention control unit 110 using an operation input means (operation switch or the like) (not shown).
- the intrusion detection and danger prevention control unit 110 will send the power from the power supply device 130 to the infrared irradiation means 120 Power supply to the system can be stopped.
- a warning is issued when an intruder enters the detection range, regardless of the state of power supply from the power supply unit 52 to the light source unit 12, as long as the power switch 140 is on.
- the intrusion detection and danger prevention control unit 110 can keep the power supply device 130 from supplying power to the infrared irradiating means 120 so that the alarm can always be output.
- the driver circuit 64 transmits the video signal to the spatially modulated light generation unit 16.
- a drive signal corresponding to VIDEO is output, and the overall control unit 66 controls the scanner 34 via the scanner control unit 68.
- Information indicating that the normal projection operation has been started is sent from the overall control unit 66 to the intrusion detection and danger prevention control unit 110, and a region corresponding to the above detection range (hereinafter referred to as an “intrusion prohibition region”) )) It is always detected whether or not a person or an obstacle has entered.
- This detection method is the same as the method described in step S4 above.
- the intrusion detection and danger prevention control unit 110 detects the intruder in the intrusion prohibited area. When this is done, it is preferable to take the following measures.
- the intrusion detection and danger prevention control unit 110 can output a warning sound or a warning message.
- the danger prevention process performed by the intrusion detection and danger prevention control unit 110 differs depending on the state when an intruder enters the intrusion prohibited area.
- the penetration time of a linear intruder is 0.05. If the penetration speed is half (lmZs), the penetration time of a linear intruder is 0.10 seconds. In the case of humans, since the width is wider than that of a linear object, the penetration time is from 0.05 to 0.1 seconds.
- noise is unavoidable in the image data captured by the imaging means 100, and there is a possibility that an erroneous determination that an intruder has momentarily and partially entered the intrusion prohibited area may be made. Yes (In such a case, there is no need to perform sensitive judgment processing.)
- stepwise prevention processing according to the result of multiplication of the intrusion duration and the size of the intrusion area.
- the “intrusion continuation time” here means the time during which the intrusion into the intrusion prohibited area continues.
- the size of the intrusion area means the size of the intrusion area
- the reflected light level of each of the monitoring areas 46 A to 46 D detected in 100 deviates from a predetermined reference range, the area of that part (for example, the number of pixels having data below the threshold value is reduced). Equivalent).
- Table 2 below shows the “intrusion state indication value” defined by the product of the continuous intrusion time and the size of the intrusion area (area of the intrusion part, etc.), and the intrusion detection and danger prevention control unit 11 1 This is an example of the content of processing performed by 0. Table 2
- the processing of the intrusion detection and danger prevention control unit 110 according to the intrusion situation is not limited to the above example, and various processing methods are possible. Methods or methods of making judgments based only on the size of the intrusion area (invasion area), or methods of making judgments by taking into account other factors, etc., are available.
- the above processing can prevent humans from injuring the human body when they enter the no-entry area. Safety measures are taken.
- tilt angle tilt angle
- step S6 In the normal monitoring state of step S6, it is assumed that infrared rays are continuously emitted from each infrared irradiating section 120A to 120D to each monitoring area 46A to 46D of the screen 40.
- Irradiation may be performed at time intervals at which an intruder can be detected in the intrusion prohibited area (for example, infrared irradiation to the monitoring area 46 is performed intermittently at intervals of several milliseconds) You can also.)
- the infrared irradiation means 120 irradiates the infrared rays from all the monitoring areas 46 A to 46 D has been described.However, for example, the position of the area 46 A is high, and If there is no possibility of intrusion in consideration of the range, it is not necessary to irradiate the area with infrared rays.
- a monitoring area 46 is provided outside the projection area 42 on the screen, and a system for monitoring entry into the intrusion prohibited area is assumed. However, another monitoring area is provided outside the monitoring area. It is possible to strengthen the monitoring system by setting the area and multiplexing the monitoring space (duplicate, triple, etc.), and such an embodiment will be described below.
- Fig. 14 is a block diagram showing an example of the configuration of the projection system. The basic elements are the same as those in Fig. 9. ), And only the differences are listed below in a bulleted list.
- the monitoring area is doubled, and the inner area (first monitoring space or
- the first alarm processing unit 70 is responsible for the first monitoring zone
- the second alarm processing unit 80 is responsible for the outer area (the second monitoring space or the second monitoring zone) and the intrusion into each monitoring space. Detect each of them and perform alarm processing according to the status and status of intrusion.
- the first alarm processing unit 70 has first detection means 72 and first alarm means 74.
- the first detection means 72 detects intrusion of a human body or the like
- the first alarm means 7 4 outputs an alarm and changes the laser light intensity (reduced or zero).
- the second alarm processing section 80 has a second detection means 82 and a second alarm means 84, and when the intrusion of a human body or the like is detected by the second detection means 82, the second alarm means 8 4 outputs an alarm.
- FIGS. 15A to 15B are schematic diagrams showing the positional relationship between the main body 1B of the projector device and the screen 40
- FIG. 15A is a perspective view showing the state of projection light
- FIG. 15B is a cross-sectional view when viewed from a direction (side) orthogonal to the projection direction.
- the image projected from the light projection unit 30 of the main unit 1B onto the screen 40 is scanned by the scanner 34 of the light projection unit 30 and projected onto the projection area 42 on the screen.
- the passage area 42 S of the light (image light) projected from the light projection unit 30 to the projection area 42 will be referred to as an “image light passage space area”.
- the first monitoring space (or zone) shall consist of the following areas.
- First monitoring area A monitoring area located on the outer periphery of the projection area 42 (similar to the above-described monitoring area 46, and its width is exaggerated in the figure).
- First spatial monitoring area spatial area located outside (outer circumference) of the video light passing space 42 S (space area located around the video light output from the light projection unit 30) S)
- the second monitoring space (or zone) shall consist of the following areas.
- “Second monitoring area” outer area of the first monitoring area 46 or the outer area 90 including the first monitoring area 46 (the area indicated by the broken line in FIG. 15A)
- “Second space monitoring area” outer area of the first space monitoring area 46S or a space area 90S including the first space monitoring area 46S (see Fig. 15B).
- the first detection means 72 is configured such that a human body or an object enters the first space monitoring area 46 S, or that these are continuously present. Is detected. Then, the first alarm unit 74 outputs an alarm based on the detection information from the first detection unit 72 and controls the power supply to the light source unit 12.
- the second detection means 82 detects that a human body or an object has entered the second space monitoring area 90S, or that they are continuously present. Then, the second alarm means 84 outputs an alarm based on the detection information from the second detection means 82.
- FIG. 16 is a flowchart showing an example of the alarm process, and the process is performed according to the following steps.
- step S11 the light source unit 12 is driven with the specified voltage from the power supply unit 52 in FIG. 14, and the image light modulated by the spatially modulated light generation unit 16 according to the image signal VIDEO is generated.
- the light is projected from the light projection unit 30 to a projection area 42 on the screen 40.
- step S12 the second detection means 82 detects whether a human body or the like has entered the second space monitoring area 90S. That is, when intrusion or presence of a human body or the like is detected, the process proceeds to step S13, and an alarm process is performed by the second alarm unit 84.
- the alarm processing for example, an audio message such as "Please move away from the projection area because it is dangerous" is output (because the message can be heard even when the viewer is not gazing at the projection area 42). Viewers can detect danger in advance. This encourages the intruder to evade.
- the second warning signal is output from the second warning means 84 to the overall control section 66 so that the overall control section 66 can process the video signal.
- a warning message signal and a warning figure signal are superimposed on the video signal VIDEO in the unit 62 and output to the driver circuit 64, and the image is displayed on the projection area 42 via the spatially modulated light generation unit 16 (This allows the viewer to detect the danger in advance by a warning display on the projection area 42 or the above-mentioned voice message.)
- Step S14 the intrusion into the first space monitoring area 46S is detected by the first detection means 72.
- the process proceeds to step S15, where the first alarm is issued.
- Step 74 performs the first alarm processing.
- the first alarm means 74 turns off the output voltage of the power supply device 52 via the regulator 54 so as not to emit the laser beam from the light source unit 12. This protects the viewer's eyes.
- a voice message stating “Stop the device because it is dangerous” is output (the reason why the projector device is stopped is understood by the viewer.).
- the first alarm means 74 lowers the output of the power supply 52 through the relay 54 to reduce the intensity of the laser light to a safe level, so that the viewer's eyes can be watched. May be protected. At this time, it is preferable to give a voice message such as "Danger to the eyes and darken it" so that the viewer can understand the reason for the decrease in the projected light.
- the first alarm signal is output to the overall control unit 66, and the overall control unit 66 sends an image signal to an external device that outputs the video signal VIDEO as necessary.
- a request to stop the output of the signal VIDEO can be made, and the projection by the projector device can be stopped.
- the restart of the projector device after the first alarm means 74 operates can be performed by resetting the regulator 54 by an operation of the operator.
- the overall control unit 66 requests the external device for the video signal when the projector device is restarted by the operator.
- the laser light is blocked or the light is blocked.
- safety measures can be taken without lowering the operation rate of the projector device compared to one-step intrusion detection. it can.
- the first detection means 72 detects intrusion into the first space monitoring area 46S within a predetermined time from the time when the second alarm means 84 operates
- the above alarm processing is performed by the first alarm means 74.
- the erroneous detection or malfunction of the first detection means 72 or the influence of the noise component relating to the detection of the first space monitoring area 46S is reduced, and the first alarm means 74 operates frequently to increase the usage of the projector device. Can be prevented.
- the second detection means 82 includes the following forms.
- thermography device A mode using a heat sensing sensor used in a thermography device or the like.
- an image sensor (CCD sensor or the like) can be used for the first detection means 72, but a form in which this is shared with the second detection means 82 is of course also possible.
- a single pyroelectric sensor can also detect the state of intrusion into the first space monitoring area 46S (the pyroelectric sensor serves as first and second detection means). Further, the use of the pyroelectric sensor can also detect that a human body enters the image light passage space area 42S.
- a plurality of pyroelectric sensors having relatively narrow directivity can be used.
- a plurality of circular frames shown in FIG. 18 represent detection areas by the respective pyroelectric sensors, and their directivity distributions are schematically shown below the figure.
- seven pyroelectric sensors are used and arranged near the light projection unit 30 so as to direct the lower, right, and left sides of the second space monitoring area 90S, respectively. Since it is impossible for a human to approach the upper part of the second space monitoring area 90S, it is not necessary to provide a pyroelectric sensor for directing this part.
- the figure shows an example of the intensity distribution of the directivity with three waveforms, but so strict conditions are required for the directivity. Therefore, it is only necessary to point outside the first space monitoring area 46 S or a range including the area 46 S. Also in this case, in order to avoid the frequent operation of the second alarm means 84 due to malfunction or noise, the second alarm means 84 is required to be activated when the pyroelectric sensor continuously detects a human body for a predetermined time or more.
- the alarm means 84 may be configured to operate.
- two pyroelectric sensors are used in combination, for example, two pyroelectric sensors are arranged side by side to form a set, and the difference between their detection signals is calculated. It is possible to detect the moving direction of the human body according to the sign (Sat).
- a pyroelectric sensor pair By using such a pyroelectric sensor pair and arranging the lower, right, and left sides of the second space monitoring area 90S so as to be directed, and using it as a differential pyroelectric sensor, A human body that enters the space monitoring area 90S can be detected.
- the temperature (body temperature) of a human body can be detected and display and control can be performed according to the temperature. For example, when the temperature detected by the heat sensor is within the human body temperature range (34 to 40 degrees), it is determined that the human body is in the second space monitoring area 90S, and the second alarm is issued. Means 84 operates.
- the detection area of the heat sensor can be defined in the same manner as the pyroelectric sensor. It is also possible to share with the first detecting means 72, and one heat sensing sensor is provided in the vicinity of the light projecting unit 30 and is located in the first space monitoring area 46S as the first detecting means 72. It can be used to detect a human body, and even a human body in the image light passage space area 42S.
- the first monitoring area 46 and the first space monitoring area 46 S are included as detection areas, and the second monitoring area 90 and A plurality (for example, about four) of ultrasonic sensors that do not include the second space monitoring area 90S as a detection area are used (each ultrasonic sensor is provided near the light projection unit 30).
- the ultrasonic sensor has a transmission / reception unit, generates ultrasonic waves by applying a voltage to the piezoelectric element, and receives the ultrasonic waves. Then, an electric signal corresponding to the amplitude of the received ultrasonic wave is output.
- the ultrasonic wave is output from the ultrasonic sensor and the screen 40
- the screen advances toward the screen 40 including the first monitoring area 46 of the first embodiment, and the reflected wave reflected on the screen 40 is received by the ultrasonic sensor.
- the level of the reflected wave is low or the reflected wave is low. It is determined by not being detected.
- a plurality of optical sensors and linear sensors are arranged along the first monitoring area 46 of the screen 40.
- the light from the light source unit 12 is sufficient from the periphery of the light projection unit 30 toward the first monitoring area 46.
- a light-emitting element group LED, etc.
- LED light-emitting element group
- an object or a human body that blocks an optical path formed between the light emitting element group and the light receiving element group can be detected.
- a configuration in which a group of infrared light emitting elements is arranged in the first monitoring area 46 and the light emitted from them is detected by the optical sensor of the projector device main body may be mentioned.
- the first monitoring area 46 is defined in the screen 40 on the outer periphery of the projection area 42, but if the first monitoring area 46 is located outside the projection area 42, It does not need to be located inside the screen 40. Also, the example in which the second monitoring area 90 is located outside the screen 40 has been described above. The viewing area 90 can be located in the screen 40 together with the first monitoring area 46.
- the detection wave infrared light or infrared light
- the detection wave used for detecting the intrusion of a human body or an obstacle is not visually recognized by the viewer, and therefore has the disadvantage of affecting the projected image on the screen and deteriorating the image quality. Absent. Also, there is no danger to the human body due to the influence of the detection wave itself.
- the present invention it is suitable for miniaturization of the device.
- the width of a monitoring area can be set to the minimum necessary limit, and the detection processing Easy and quick.
- the influence on a human body can be suppressed by restricting irradiation light, and sufficient safety measures can be taken.
- ADVANTAGE OF THE INVENTION in application to the image projection apparatus provided with the light modulation means, it is effective in improving safety and reliability.
- the present invention by controlling the power supplied to the light source, the light intensity can be surely regulated. According to the present invention, it is possible to control the light output level in detail according to the degree of the intrusion state, and it is effective for preventing erroneous detection.
- intrusion detection processing is easy and does not require complicated image processing or the like.
- the intensity of irradiation light is suppressed until safety is confirmed, so that high security can be guaranteed.
- a multiple monitoring system is effective in strengthening safety measures.
Abstract
Description
Claims
Priority Applications (3)
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KR1020047001967A KR100947147B1 (ko) | 2002-06-10 | 2003-06-10 | 화상 투사 장치 및 화상 투사 방법 |
US10/486,055 US7364309B2 (en) | 2002-06-10 | 2003-06-10 | Image projector and image projecting method |
EP03736137A EP1513008A4 (en) | 2002-06-10 | 2003-06-10 | IMAGE PROJECTOR AND IMAGE PROJECTION METHOD |
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JP2002169238 | 2002-06-10 | ||
JP2002-169238 | 2002-06-10 |
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WO2003104892A1 true WO2003104892A1 (ja) | 2003-12-18 |
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PCT/JP2003/007372 WO2003104892A1 (ja) | 2002-06-10 | 2003-06-10 | 画像投射装置及び画像投射方法 |
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Also Published As
Publication number | Publication date |
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US20050128578A1 (en) | 2005-06-16 |
EP1513008A4 (en) | 2006-04-19 |
KR100947147B1 (ko) | 2010-03-12 |
EP1513008A1 (en) | 2005-03-09 |
KR20050005393A (ko) | 2005-01-13 |
US7364309B2 (en) | 2008-04-29 |
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