CA2480510A1 - A programmable light beam shape altering device using programmable micromirrors - Google Patents

A programmable light beam shape altering device using programmable micromirrors

Info

Publication number
CA2480510A1
CA2480510A1 CA002480510A CA2480510A CA2480510A1 CA 2480510 A1 CA2480510 A1 CA 2480510A1 CA 002480510 A CA002480510 A CA 002480510A CA 2480510 A CA2480510 A CA 2480510A CA 2480510 A1 CA2480510 A1 CA 2480510A1
Authority
CA
Canada
Prior art keywords
shape
light
image
stage
performer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002480510A
Other languages
French (fr)
Other versions
CA2480510C (en
Inventor
William Hewlett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Light and Sound Design Ltd Great Britain
Original Assignee
Light & Sound Design, Ltd.
William Hewlett
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Light & Sound Design, Ltd., William Hewlett filed Critical Light & Sound Design, Ltd.
Publication of CA2480510A1 publication Critical patent/CA2480510A1/en
Application granted granted Critical
Publication of CA2480510C publication Critical patent/CA2480510C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7458—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • F21S10/007—Lighting devices or systems producing a varying lighting effect using rotating transparent or colored disks, e.g. gobo wheels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G02B26/0841—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD the reflecting element being moved or deformed by electrostatic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S359/00—Optical: systems and elements
    • Y10S359/90—Methods

Abstract

A digital micromirror device ("DMD") is used to alter the shape of light that is projected onto a stage. The DMD selectively reflects some light, thereby shaping the light that is projected onto the stage. The control for the alteration is controlled by an image. That image can be processed, thereby carrying out image processing effects on the shape of the light that is displayed. One preferred application follows the shape of the performer and illuminates the performer using a shape that adaptively follows the performer's image. This results in a shadowless follow spot

Claims (41)

1. A method of projecting an intensity - modulated scene on a stage, comprising:
determining a factor of modulation;
translating the factor into a duty cycle, each portion of the duty cycle being a time shorter than a human eye's persistence of vision;
alternately projecting the scene onto the stage, and some other image less than the scene onto the stage at alternate times defined by said duty cycle, so that persistence of vision averages the total light impinging on the scene.
2. A method of operating a gobo, comprising:
defining a gobo shape using a software-based system, to provide a computer file indicative of an image of the gobo shape; and using the computer file indicative of the image of the gobo shape to project an image of light on the stage.
3. The method as in claim 2, wherein said defined shape is a stencil, and the image is light that is within the stencil shape.
4. The method as in claim 2, wherein a complement of said defined shape is used to project the image.
5. The method as in claim 2, wherein said defining comprises carrying out an image processing operation on the image to change a shape of the gobo being displayed, the shape being changed each time the image processing operation occurs.
6. The method as in claim 5, wherein said image processing operation is one of an edge effects processing;
an image shape processing; and a duty cycle processing operation.
7. The method as in claim 5, further comprising defining slices of time at which different image-processed images are to be displayed, and displaying incremental changes of the image processing software at said defined times.
8. The method as in claim 2, further comprising changing the image in software, and displaying the changed image as it is changed.
9. The method as in claim 2, wherein said using comprises commanding a reflector to a first position to pass light to the stage, and commanding a reflector,to a second position to reflect light away from the stage.
10. The method as in claim 2, wherein said image processing operation includes rotation of the defined shape.
11. The method as in claim 2, wherein said image processing operation includes morphing of the defined shape from a first shape to a second shape.
12. The method as in claim 2, wherein said image processing operation includes forming an edge of the image which has a different gray scale value than another part of the image.
13. The method as in claim 2, wherein said image processing operation comprises modifying a color of the defined shape.
14. The method as in claim 2, wherein said image processing operation comprises strobing the defined shape on and off to change an intensity thereof.
15. The method as in claim 2, wherein said defining a gobo shape comprises:
monitoring a shape of the performer on the stage;
forming an image which approximates the shape of the performer on the stage, and wherein said using comprises using said image to shape a spot which is projected on the stage, so that a spot is formed which approximates the shape of the performer on the stage.
16. A method of shaping a light beam for a stage lighting device, comprising:
forming a light beam of a first shape;
defining a second shape as an object of morphing; and morphing the shape of the light beam from the first shape to the second shape.
17. The method as in claim 16, wherein the shape of said light beam is changed from said first shape to said second shape through intermediate shapes between said first shape and said second shape at defined time slices between a beginning time of the morphing and an ending time of the morphing.
18. The method as in claim 16, wherein said forming and morphing comprises passing the light beam through an array of selectively alterable reflection devices, some elements of the array selectively reflecting parts of the light beam.
19. A method of forming a gobo effect in a stage lighting device using duty cycle modulation, comprising:
defining a shape of light to be displayed; and adjusting some portion of the shape of said light to be displayed by displaying said portion at a duty cycle less than one, said duty cycle having a frequency greater than a persistence of vision of the human eye.
20. The method as in claim 19, wherein said duty cycle is greater than 60 hertz.
21. The method as in claim 19, wherein said adjusting is a dimming effect, and wherein the shape is projected to a stage, and then not projected to the stage, a ratio between a time of projection and non-projection defining said duty cycle.
22. The method as in claim 19, wherein said effect is an edge graying, and wherein said portion is an edge portion of the shape which is displayed at the duty cycle, while other portions of the shape are displayed substantially continuously.
23. A stage lighting spot light apparatus, comprising:
a first element which determines a shape of a performer on the stage and produces a digital representation indicative thereof;
a memory, storing said digital representation;
a light shape altering device, in a path of a beam of light, said light shape altering device altering a shape of said beam of light to substantially conform with contents of said digital representation in said memory.
24. The apparatus as in claim 23, wherein said first element includes a image acquiring camera.
25. The apparatus as in claim 24, wherein said light shape altering device includes a plurality of movable mirrors, which are controlled to a first position toy pass light away from the stage, and a second position to pass light to the stage.
26. The apparatus as in claim 23, wherein said first element includes a camera and a digitizing element .which digitizes an output of said camera.
27. The apparatus as in claim 23, wherein said:first element comprises an image correlating processor, correlating over an image of the stage to determine a shape of the performer in the image, and which converts the shape of the performer to the digital representation indicative thereof, and stores said digital representation in said memory.
28. The apparatus as in claim 27, wherein said memory is a video RAM.
29. The apparatus as in claim 27, further comprising a tracking element which tracks a position of the performer, and further comprising a movable light which moves to follow the position of the performer tracked by said tracking element.
30. The apparatus as in claim 29, wherein said first element further includes a camera, and wherein said camera has a common axis of rotation with said. movable light.
31. A method of lighting a performer on a stage, comprising:
obtaining an image of a portion of the stage which includes the performer;
processing said image to determine a shape of the performer in said image;
forming a digital representation of said shape; and using said digital representation to form a beam having the shape of the performer, to thereby project a light in the shape of the performer.
32. The method as in claim 31, wherein said processing comprises correlating the shape of the performer over the image.
33. The method as in claim 31, wherein said using comprises selectively reflecting light away from the stage.
34. A method of illuminating a stage performer, comprising:
obtaining information indicative of a shape of the performer on the stage within a field of view of a light beam projecting device;
adjusting said information to slightly shrink an outline of the shape and to form modified information; and using said modified information to alter a shape of light being projected to thereby project a beam of light having the shape of the performer.
35. The method as in claim 34, wherein said altering the shape of light comprises:
providing an array of movable mirrors which can move in response to a signal applied thereto;
processing said information to form said information into an array of signals to be mapped to said array of movable mirrors; and said micromirrors being responsive to said array of signal to control the states thereof and thereby selectively reflect light to the stage and reflect light away from the stage, depending on a state of an applied signal.
36. The method as in claim 34, wherein said obtaining comprises obtaining an image of a scene and processing said scene to determine the shape of the performer therewithin;
and translating said shape to digital information indicative thereof.
37. A method of forming a shadowless spot light, comprising:
analyzing an image of a stage including the performer thereon to determine a shape of the performer on the stage;
and using a digital element to adjust a shape of light projected onto the stage to conform with said shape.
38. The method as in claim 37, further comprising slightly shrinking the shape of the performer prior to adjusting the shape of light.
39. A heat-controlled gobo device, comprising:
a light projector, a gobo device in the path of said light projector, said gobo device allowing only light of a specified shape to pass; and a heat sink device, located in a location to receive the light which is not allowed to pass by said gobo device.
40. The heat-controlled gobo device as in claim 39, wherein said gobo device includes an array of selectively movable mirrors, and said heat sink device comprises a heat sink in a path where said mirrors can reflect unwanted light to said heat sink.
41. A light shape altering device, having elements which selectively modify light, comprising:
a light beam producing element, producing a light beam which is projected along a path;
a digital micromirror device, having a plurality of elements arranged in an array, each element defining a portion of an image, and each element being separately controllable between a first state which reflects to a desired object of illumination and a second state which reflects light away from the desired object of illumination;
projection optics, optically in series with the plurality of direction reflecting devices and the light beam, receiving light from those devices which are passing light in the first direction, and passing the light from those devices to a the desired object;
a controller which obtains a desired shape for a light beam;
a memory element, storing a digital image representation therein of said desired shape, said memory element connected to control said digital micromirror device in a way such that reflecting states of the elements of said digital micromirror device are controlled to conform to said digital image representation in the memory element.
CA2480510A 1996-02-07 1997-02-07 A programmable light beam shape altering device using programmable micromirrors Expired - Fee Related CA2480510C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/598,077 1996-02-07
US08/598,077 US5828485A (en) 1996-02-07 1996-02-07 Programmable light beam shape altering device using programmable micromirrors
CA002245842A CA2245842C (en) 1996-02-07 1997-02-07 A programmable light beam shape altering device using programmable micromirrors

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002245842A Division CA2245842C (en) 1996-02-07 1997-02-07 A programmable light beam shape altering device using programmable micromirrors

Publications (2)

Publication Number Publication Date
CA2480510A1 true CA2480510A1 (en) 1997-08-14
CA2480510C CA2480510C (en) 2010-11-16

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
CA2480510A Expired - Fee Related CA2480510C (en) 1996-02-07 1997-02-07 A programmable light beam shape altering device using programmable micromirrors
CA002245842A Expired - Fee Related CA2245842C (en) 1996-02-07 1997-02-07 A programmable light beam shape altering device using programmable micromirrors

Family Applications After (1)

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Country Status (8)

Country Link
US (5) US5828485A (en)
EP (8) EP1445637A3 (en)
JP (3) JP3793577B2 (en)
AU (1) AU1845497A (en)
CA (2) CA2480510C (en)
DE (4) DE69739508D1 (en)
DK (3) DK1447702T3 (en)
WO (1) WO1997029396A1 (en)

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