WO1997005560A1 - Extended working range dataform reader with reduced power consumption - Google Patents
Extended working range dataform reader with reduced power consumption Download PDFInfo
- Publication number
- WO1997005560A1 WO1997005560A1 PCT/US1996/012184 US9612184W WO9705560A1 WO 1997005560 A1 WO1997005560 A1 WO 1997005560A1 US 9612184 W US9612184 W US 9612184W WO 9705560 A1 WO9705560 A1 WO 9705560A1
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- WIPO (PCT)
- Prior art keywords
- dataform
- gain
- reader
- control circuitry
- module
- Prior art date
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Classifications
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- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
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Definitions
- the invention relates to dataform readers and methods for reading dataforms including barcodes, such as ID and 2D codes, and other dataforms such as matrix codes. More particularly, the invention relates to dataform readers and methods which achieve high resolution imaging of the dataforms with reduced power consumption.
- Bar codes and matrix codes are forms of "dataforms", which for present purposes are defined to include all arrangements whereby data is fixed in some form of machine readable copy.
- dataforms include one and two dimensional bar codes (e.g. UPC, Cl 28, PDF417, etc.), matrix codes (e.g. Maxicode, Data Matrix, Code 1, etc.) and graphic codes, as well as words and numbers and other symbols, which may be printed or etched on paper, plastic cards and metallic and other items.
- Dataforms may be printed in invisible ink, magnetically recorded via magnetic stripes or magnetic ink fonts, electromagnetically recorded via RF tags, engraved, stamped, tattooed (on skin) , formed by ion doping (for semiconductor wafers) or biochemical binding, etc.
- data originally encoded is recovered for further use in a variety of ways.
- a printed bar code may be optically scanned to derive reflectance values which are digitized, stored in buffer memory and subsequently decoded to recover the data encoded in the bar code.
- an image is typically acquired and stored as pixel values for further processing.
- An image of a bar code or matrix code existing as a graphic image can be acquired by use of a CCD reader, a laser scanner or other suitable device which is capable of distinguishing between different reflective values of light reflected data cells and synchronizing the data cell format for a particular dataform.
- a bar code typically comprises black or dark colored bar type elements printed on a white or light colored background area, with white or light colored spaces between the elements of the bar code.
- the spaces are typically the same color as the background area, but may be of a different light color in this example.
- the elements of a bar code or matrix code are white or light colored and are defined by black or darker colored spaces and background area.
- illumination may result in a dark on light relationship in one orientation and a light on dark relationship in a different orientation.
- pixel values representing reflective values of light (“light” being defined as encompassing the entire electromagnetic spectrum for present purposes)
- pixel values representative of reflective values may be based upon reflection of sound waves or other mediums from a dataform of an appropriate configuration.
- reflective values may typically be stored as pixel values in an image buffer memory or other storage medium in bit map or other form which, while representative of pixel values for an image, may utilize any appropriate data storage format.
- Laser barcode scanners operate by projecting a narrow laser beam of light which form ⁇ an intensely illuminated spot on the barcode. Oscillating mirrors continually redirect the laser beam so that the spot moves in a sweeping pattern or a raster pattern.
- a sweeping pattern refers to oscillation of the beam along the horizontal axis without any vertical oscillation.
- a raster pattern refers to a rapid oscillation along the horizontal axis and a slower oscillation along the vertical axis so that raster pattern appears to be a sweeping pattern moving up and down.
- a photodetector collects illumination from the entire target area.
- the moving, or flying spot When the moving, or flying spot is incident on a highly reflective portion of the barcode, such as a white background, light reflected from the spot is incident on the photosensor. When the flying spot is incident on a less reflective portion of the barcode, such as a black bar, less light is reflected towards the photodetector.
- a laser scanner does not have an internal synchronization mechanism.
- the laser scanner calculates the laser spot's relative horizontal position based on known self-synchronizing patterns in the ID barcode. This can be referred to as a code self-synchronized system.
- a raster pattern laser scanner can read 2D stacked barcode such as PDF-417 because PDF-417 has particular row indicator patterns which are recognizable and used by the scanner for vertical synchronization. This system has very little rotation angle tolerance, because the scanner can not recognize a row indicator pattern or other codeword pattern unless the spot sweeps across the entire pattern.
- a laser scanner can not read 2D matrix codes such as the Maxicode and the Datamatrix because such codes do not have row indicator patterns for vertical synchronization.
- the 1-dimensional CCD reader operates by imaging a long and thin target area onto a one-dimensional photodetector array rather than scanning a spot of illumination across the barcode symbol. If the reader is positioned relative to a ID barcode so that the imaged target area falls relatively across the barcode, then the barcode can be decoded based on the run-length sequences of grayscale value ⁇ derived from the pixels on which each bar and space of the code is imaged. Similar to the laser scanner, the ID CCD has no vertical synchronization and must rely on row indicator patterns for vertical synchronization. More recently, the CCD reader concept has been extended to two-dimensional CCD readers such as the TEC contact reader made by Tokyo Electric Company.
- a two dimensional CCD reader images an area onto a two- dimensional array of photodetectors.
- Such a device is capable of reading matrix codes because the 2-dimensional pixel array provides both horizontal and vertical synchronization.
- This reader is too large and bulky for practical use in a portable terminal. Furthermore, the device consumes too much power for battery powered portable use.
- Current 2-dimensional CCD readers have an image capture system that includes a board camera which continually produces a composite video signal representative of the target area. When a reading session begins, a portion of the video signal is selected for decoding. Because the board camera continually generates a video signal, it consumes approximately 1-2 watts of power. Such consumption would drain typical batteries in less than 1 hour of operation.
- Current image capture configurations do not provide for the board camera to be shut down between reading sessions.
- Current art board cameras require over 600ms latency time to generate a gain corrected and properly exposed composite video signal after power up. Most of the time is required to automatically adjust the gain control and exposure period through closed loop analog feed back circuitry. Therefore, if each read session required powering up the board camera, the read session would be longer than 600ms. Because of customer expectations for a rapid response time, a read session should be under 300ms. Therefore the board camera can not be shut down between read sessions.
- Current art gain control systems include an analog integration circuit that receives the analog video signal from the photosensor array and generates a voltage signal. The voltage signal is input to analog gain adjustment circuitry which adjusts the gain amplifier accordingly. Closed loop analog circuits require in excess of 500ms from power up to reach equilibrium wherein a gain corrected ⁇ ignal i ⁇ produced.
- Current art exposure control systems also include an analog integration circuit that receives the analog video signal from the photosensor array. The output signal is input to exposure timing circuitry which adjusts the exposure period for the sensor array.
- the exposure control system also requires in excess of 500ms from power up to reach equilibrium and properly expose the sensor array.
- such module be of a size and shape comparable to current laser scanners so that it is mechanically retrofittable into devices that currently include a laser scanner. Further yet it is desirable that such reader module be electrically compatible with current laser scanners so that it is electrically retrofittable into devices that currently include a laser scanner.
- a portable dataform reader module is provided with a size and shape comparable to current laser scan modules.
- the reader include ⁇ a board camera that is turned off between dataform reading sessions to achieve low power consumption.
- the reader in accordance with this invention includes open loop gain control circuitry that provides an initial gain setting (after power up) equal to the gain setting stored in a memory from the previous read session. After capturing the first field of image data, the correct gain is calculated. If the gain value is used and the correct value is close, then image field is used for decoding. If not close, a new field is captured with the correct setting. In either case, the most recent correct value is stored in memory for later use. This system provides for correct gain being achieved within 1-3 fields after power up corresponding to a 50ms latency time.
- an open loop exposure control system provides an initial exposure period equal to the exposure period stored in memory from the previous read session. After capturing the first field of image data, the correct exposure is calculated. If the exposure period is u ⁇ ed and the correct value is close, then image field is used for decoding. If not close, a new field is captured with the correct setting. In either case, the most recent correct value is stored in memory for later use.
- This system provides for correct exposure being achieved within 1-3 fields after power up corresponding to a 50ms latency time.
- an open loop exposure control ⁇ y ⁇ tem is provided which sets the exposure period to the period used for the most recent read se ⁇ sion at power up. Again, if incorrect, the sy ⁇ tem provides an incremental adjustment ⁇ o that proper expo ⁇ ure can be obtained within 1 to 3 fields after power up.
- the reader includes a large F# optic assembly that provide ⁇ a working range from about 2.5" to at lea ⁇ t 8.5" in front of the reader while maintaining a broad field of view.
- the reader is capable of capturing a high signal to noi ⁇ e ratio image in under .01 ⁇ econd ⁇ thereby making the reader highly tolerant to hand jitter.
- the reader is provided with an efficient high intensity uniform illumination module.
- the illumination module includes a printed circuit board a ⁇ sembly including a plurality of surface mount LEDs secured to the front side of a printed circuit board.
- the board i ⁇ bonded into a cavity in the backside of a durable acrylic lens array.
- the lens array operates to direct uniform and inten ⁇ e illumination towards a target area in front of the reader.
- the illumination module has an aperture in the center and the reader module is positioned to gather light reflected from the target area through the aperture. This configuration assures illumination directed from the lens array of the reader module is aligned with the field of view of the reader module.
- the reader module includes circuitry that emulates the output of a laser scan module making it retrofitable into devices that current include a laser scanner.
- a data collection system in another a ⁇ pect of thi ⁇ invention, includes the reader module in accordance with this invention.
- the dataform reading ⁇ ystem is intended for complete portable use and includes a spread ⁇ pectrum radio which operates to couple the reader with a computer throughout an IEEE 802.11 compatible network.
- the spread spectrum radio can be used to transmit decoded dataform data, photographic image data in a compres ⁇ ed format, or compre ⁇ sed data files representing voice messages.
- the dataform reader include ⁇ u ⁇ er interface devices such a ⁇ a keyboard, display, touch panel, microphone and speaker which operate with various circuit ⁇ to improve the functionality of the reader.
- Figure 1 show ⁇ a perspective view of a dataform reader module in accordance with this invention.
- Figures 2 show ⁇ a flowchart of the operation of the open loop gain control 25 ⁇ ystem in accordance with this invention.
- Figure 3 show ⁇ a flowchart of the open loop expo ⁇ ure control system in accordance with this invention.
- Figure 4 show ⁇ a diagrammatic top view of the reader module in accordance with thi ⁇ invention.
- Figure 5 how ⁇ an exploded per ⁇ pective view of the illumination module of thi ⁇ mvention.
- Figure 6 how ⁇ a ⁇ ide cro ⁇ ⁇ ectional view of the illumination module of this invention.
- Figure 7 show ⁇ a ⁇ tate chart of the operation of the power control circuitry in accordance with thi ⁇ invention.
- Figure 8 how ⁇ a perspective view of a portable data collection sy ⁇ tem in 10 accordance with thi ⁇ invention.
- Figure 9 how ⁇ a per ⁇ pective view of an alternative portable data collection ⁇ y ⁇ tem according to thi ⁇ invention.
- Figure 10 how ⁇ a cut away ⁇ ide view of the dataform reader of figure 8.
- Figure 11 shows a block diagram of the voice mail system according to the present invention.
- FIG. 13 how ⁇ a wireless headset in accordance with this invention.
- the dataform reader module 10 of this invention is shown generally in figure 1.
- the module includes camera assembly 26 and control and decoder board 56.
- the camera as ⁇ embly 26 compri ⁇ es a board camera assembly (shown as a three board assembly) 62 which includes a two dimen ⁇ ional photo ⁇ en ⁇ or array 60.
- the camera as ⁇ embly 26 al ⁇ o include ⁇ an optic a ⁇ embly 58 for focusing an image of a dataform in a target area onto the sensor array 60 and camera housing 64 which shroud ⁇ ambient light from the photosensor array 60 and positions the optic assembly 58 such that the photosensor array is substantially at the image plane.
- the board camera 62 include ⁇ an input port for a power signal which provides operating power for generating a composite video signal.
- An additional gain input port is connected to the gain adjustment circuitry to bypa ⁇ s the analog gain circuitry and an additional exposure input port is connected to the exposure timing circuitry to bypass the analog exposure control circuitry.
- the control and decoder board 56 includes digital gain control circuitry which may be embodied in code executed by the microprocessor 51.
- Figure 2 shows a flow chart of the operation of the gain control circuitry. Box 200 repre ⁇ ent ⁇ initial power up of the board camera. At power up, the gain control circuitry ⁇ ets the gain value to the gain setting used during the previous dataform reading se ⁇ ion 202.
- the gain circuitry will provide a digital value to an Digital-to-Analog (D/A) converter which ⁇ upplies a voltage signal to the gain adjustment circuitry on the board camera.
- D/A Digital-to-Analog
- Box 204 represent ⁇ the capture of a field of image data. Ba ⁇ ed on the gain value u ⁇ ed and the resultant field of image data, a correct gain value i ⁇ calculated based on a look up table at 206. The new value is stored in memory for the next field capture at 208. If the difference between the gain value used and the calculated value is less than a threshold at 210, the field is u ⁇ ed for decoding at 212. Alternatively, if the difference i ⁇ greater than the thre ⁇ hold, then the system returns to 202 to capture another field at the calculated value.
- a gain corrected video ⁇ ignal can be achieved in 1-3 fields after power. Thi ⁇ corre ⁇ pond ⁇ to a 10-50ms latency time.
- the control and decoder board 56 also includes digital exposure control circuitry which may be embodied in code executed by the microproce ⁇ or.
- Figure 3 shows ⁇ a flow chart of the operation of the expo ⁇ ure control circuitry.
- Box 214 repre ⁇ ent ⁇ initial power up of the board camera.
- the expo ⁇ ure control circuitry ⁇ ets the exposure period to the period stored in memory from the previous dataform reading session 216.
- the exposure control circuitry will provide a digital value to a D/A converter which supplies voltage signals to the exposure adjustment circuits on the board camera.
- Box 218 represents the capture of a field of image data. Based on the gain value used and the resultant field of image data, a correct exposure period is calculated based on a look up table at 220.
- the new value is stored in memory for the next field capture at 222. If the difference between the exposure period used and the calculated value i ⁇ le ⁇ than a threshold at 224, the field is u ⁇ ed for decoding at 226. Alternatively, if the difference is greater than the threshold, then the system returns to 216 to capture another field at the calculated value. Because the exposure control system provides an initial exposure setting tied to a previously correct exposure setting and for incrementally adjusting the expo ⁇ ure period after evaluation of a field of image data, a properly expo ⁇ ed video ⁇ ignal can be achieved in 1-3 field ⁇ after power. Thi ⁇ corresponds to a 10-50ms latency time.
- control and decoder board 56 also includes image processing circuitry, embodied in code operable by microprocessor 51, which is operative to decode the dataform in the image area.
- image processing circuitry embodied in code operable by microprocessor 51, which is operative to decode the dataform in the image area.
- An appropriate decoder system is described in US Patent Application Attorney Docket No. 92100 filed May 17, 1995, and US Patent Application Atorney Docket No. 92115 filed May 31, 1995, the contents of both application ⁇ are hereby incorporated by reference.
- Other decoder systems known in the art are also contemplated by this invention.
- the decoded result ⁇ are made available to other proce ⁇ ing circuitry (discussed later) through a data transfer link 53.
- the control and decoder board 56 further includes laser module emulation circuitry embodied in code executable by microprocessor 51.
- the emulation circuitry operates to encode the decoded result ⁇ in a standard 1-dimensional barcode format, ⁇ uch as code 39, and output a square wave signal emulating the square wave signal of a laser scanner module scanning the 1-dimen ⁇ ional code. It should be appreciated that this feature provides for electrical compatibility with a laser scanner module while providing the capability of reading an assortment of dataforms including 2-dimensional matrix code ⁇ .
- the square wave signal is made available for further proces ⁇ ing through data transfer link 53.
- the device in addition to capturing the image of a dataform, can be used to photograph an object in the target area.
- an operator can use the reader module to photograph a damaged product and also capture an image of a dataform a ⁇ sociated with the damaged product.
- the decoder board will transfer a digital image, such as a bit map, of the image via data transfer link 53. While figure 1 shows the reader module of this invention embodied in a camera assembly 26 and a control and decoder board 54, figure 14 shows a single board embodiment.
- FIG. 1 show ⁇ the reader module 10 of thi ⁇ invention embodied in a camera a ⁇ embly 26 and a control and decoder board 56
- figure 4 shows the cutaway top view of camera assembly 26 with icroproces ⁇ or 51, data transfer link 53, and associated circuitry for performing the open loop gain control, open loop exposure control, decoding and other above mentioned function ⁇ integrated into the board camera assembly 62.
- the performance of the dataform reader module is enhanced by providing an optic system with an extended working range. Based on the position between the optic assembly and the photosen ⁇ or array, there exi ⁇ t ⁇ a be ⁇ t focus position S2 in front of the optic as ⁇ embly 58 at which an image of the object in the object field 66 will be sharpe ⁇ t on the ⁇ en ⁇ or array 60. The image gradually degrade ⁇ as the object is moved towards the near field cut off distance SI and a far field cut off distance S3.
- the optic assembly 58 also has a field of view 68 which is wide enough to image large dataforms at the far field S3 and still provide a large image of a small dataform located at the near field SI.
- the optical assembly 58 has a working range from about 2.5" to at least 8.5" from the front surface of the optical assembly 86, with best focu ⁇ di ⁇ tance being at 5.5".
- the preferred field of view corre ⁇ pond ⁇ to a target ⁇ urface 5 inche ⁇ long by 3.75 inche ⁇ wide at 8.5" from len ⁇ surface 86.
- An optical sy ⁇ tem that will meet the ⁇ e performing requirement ⁇ include a ⁇ ymmetrical len ⁇ structure.
- Two substantially identical lenses 82 and 84 will be positioned with mirrored symmetry about the aperture 90.
- Surface 86 is aspherical having a magnitude and shape defined as an even asphere having a radius of curvature of 1.5298mm, a conic constant of -0.019890, a 6th order aspheric deformation coefficient of 0.0096mm, an 8th order coefficient of -0.0057, and a 10th order coefficient of 0.0023.
- the surface 88 is a spherical surface with a radius of curvature of 1.6004mm.
- the aperture 90 measures 0.3606mm and is po ⁇ itioned between the len ⁇ e ⁇ 82 and 84 a ⁇ shown to provide the optical as ⁇ embly an F#13.
- the len ⁇ diameter is not critical to this invention.
- pla ⁇ tic optic ⁇ i ⁇ Another benefit of pla ⁇ tic optic ⁇ i ⁇ that the co ⁇ t ⁇ associated with grinding aspherical surface ⁇ on gla ⁇ s optics is avoided.
- An aspherical surface is easily formed by injection molding a plastic optic. While the above optic system provides the desired attributes of the invention, tho ⁇ e ⁇ killed in the art are able to provide other optics with similar performance characteri ⁇ tic ⁇ .
- Becau ⁇ e the de ⁇ ired working range and field of view of the reader of this invention dictate that the optic system must have a large F# (F#5.6 or greater), the photosensor array exposure period and illuminator sy ⁇ tem for the reader mu ⁇ t provide for adequate expo ⁇ ure of the photo ⁇ ensor array.
- the exposure period must be .01 second ⁇ or le ⁇ s, which is substantially les ⁇ than current CCD reader ⁇ . Therefore, the illumination system of this invention mu ⁇ t provide adequate illumination to accommodate the large F# and short expo ⁇ ure time.
- Proper expo ⁇ ure of the ⁇ en ⁇ or array requires an object field illumination of 0.3 lux as ⁇ uming an expo ⁇ ure period of .03 ⁇ econd ⁇ and an F#1.2. To determine the proper object field illumination of the preferred embodiment for a 0.01 second exposure period and an F#l
- module 28 includes a lens array 24 and a printed circuit board assembly 40.
- the printed circuit board as ⁇ embly 40 includes a plurality of surface mount LEDs 46 secured to a printed circuit board 54.
- Printed circuit board 54 includes printed conductors and power lead 72 operative for supplying power to the LEDs 46.
- a suitable surface mount LED is produced by the Marktech Corporation of Latham, NY, as Part No. MTSM735K-UR or MTSM745KA-UR. Each provides illumino ⁇ ity of 285 med over an illumination field of about 68°.
- the ⁇ mall footprint of the LED 46 provide ⁇ for twelve to be placed in a row mea ⁇ uring less than 1.5".
- the printed circuit board a ⁇ embly 54 includes 24 LED 46 in two rows providing 6840 med of uniform illumination over a 68° field.
- the lens array 24 include ⁇ a plurality of expo ⁇ ure illuminator len ⁇ element ⁇ 30 all of which are po ⁇ itioned in front of an LED 46.
- the expo ⁇ ure illuminator len ⁇ element ⁇ 30 direct the 68° field of illumination from each LED into a ⁇ maller uniform illumination field corre ⁇ ponding to the field of view of the optic (about 50°) .
- FIG 6 which shows a cross section of the assembled illumination module 28, it can be seen that each exposure lens cell 30 ha ⁇ an inner len ⁇ ⁇ urface 42 and a focal point 80.
- the lens cell acts as a light directing element rather than an imaging element thereby avoiding hot spot ⁇ in the target area and providing a highly uniform illumination.
- the 68° field of illumination from each LED 46 i ⁇ gathered by each len ⁇ cell 30 and directed into a field corre ⁇ ponding to the optical system field of view which is smaller than 68°.
- lens cell ⁇ 30 overlap there is "cross talk" between the optical surfaces such that illumination from one LED may be directed toward ⁇ the target area by a cell associated with another LED. 6840 med of illumination, over an illumination field corre ⁇ ponding to the optic field of view, will provide an illumination inten ⁇ ity in excess of 106 lux at the far field cut-off distance of 8.5".
- two targeting lens elements 34 po ⁇ itioned over two targeting LEDs 47 project two pencils of targeting illumination 107, forming hot spots, into the target area at angles corresponding to the optical systems field of view 68.
- the hot spots are visible to the operator and facilitate positioning of the portable dataform hand held reader so that the target dataform is within the field of view of the optical sy ⁇ tem.
- the lens array 24 forms the front surface of the illumination module protecting the printed circuit board as ⁇ embly 40 from phy ⁇ ical impact a ⁇ well a ⁇ from dirt, moi ⁇ ture and other harmful element ⁇ found in the environment.
- the len ⁇ array 24 is preferably molded of an impact resistant acrylic or other suitable material that has a high illumination transmittivity and durability necessary for the environment in which a portable hand held dataform reader is operated.
- a conformal coating is applied to the board assembly 40 and the assembly is bonded into a cavity in the back of the lens array 24 with a cynoacrolate, UV curing or ⁇ tructural adhesive.
- the illumination module 28 may be secured to the front of the camera housing 64 by inserting four screw ⁇ through the four hole ⁇ 57 in the reader module and threading them into the co-axially aligned holes 59 in the camera housing 64.
- the module includes power savings circuitry designed to operated with a two position manually activated trigger.
- the trigger may be either a two position trigger (released and pulled) or a three position trigger (released, fir ⁇ t position and second position) .
- the circuitry controls operation of the board camera 62 and the illumination module 28 during a read ⁇ e ⁇ ion.
- Figure 7 shows a state chart repre ⁇ entative of the power control circuitry. When in the off state 228 power is not supplied to either the illumination module or the board camera.
- the microprocessor provides for the targeting illuminators to be on and the board camera and exposure illuminators to be off.
- the system enters the dataform read state 232.
- the dataform read state has two sub-states, exposure 234 and decode 236.
- the exposure state 234 the targeting illuminators are off while the exposure illuminators and board camera are operational.
- the system After capture of an image, the system enters the decode sub- ⁇ tate 236, wherein, the expo ⁇ ure illuminators and board camera are off while the targeting illuminators are on to assist the operator in holding the reader in position in case a second image needs to be captured. If a ⁇ uccessful decode occurs, the sy ⁇ tem returns to the off state 228. If the trigger is relea ⁇ ed, the ⁇ ystem returns to the targeting state 230 and off state 228. A time out can also cau ⁇ e the ⁇ ystem to return to the off state without a succe ⁇ ful decode.
- the ⁇ ystem can operate in two embodiments.
- a trigger pull causes the ⁇ ystem to enter the targeting state 230. Releasing the trigger cause ⁇ the ⁇ ystem to enter the dataform read state 234.
- the exposure sub-state 234 and the decode sub-state 236, operate similar to the three position trigger embodiment.
- a time out will cause the ⁇ y ⁇ tem to return to the off state.
- a trigger pull may cause the ⁇ y ⁇ tem to enter a fully automatic read ⁇ tate 238.
- the system will automatically enter targeting sub- ⁇ tate 230 for a period of time and then enter the dataform read ⁇ tate 232. Operation of the dataform read ⁇ tate i ⁇ the ⁇ ame a ⁇ the above di ⁇ cu ⁇ ed embodiments.
- a trigger relea ⁇ e will cause the sy ⁇ tem to return to the off ⁇ tate 228.
- Figure ⁇ 8 and 9 show two embodiments of a portable data collection sy ⁇ tem in accordance with this invention.
- the housing shown in figure 8 is generally a gun shaped device 11 with a housing 12, forming an upper enclosure, and a handle portion 14 extending below the upper enclosure.
- the housing is constructed of a suitable impact resi ⁇ tant plastic that provides both durability and light weight.
- a plurality of key switches 22 and a display screen 32 with an overlaying touch panel 44 are visible on the upper surface.
- the system 11 shown in figure 9 is generally a palm sized device configured to be held in the palm of the operators hand.
- a multi-position trigger switch 16 to initiate a dataform reading session is located at the center of the upper surface to enable activation by the operator's thumb.
- control and decoder board 56 is coupled to a main control board 31 which includes microprocessor 13 for further processing the data tran ⁇ ferred from the control and decoder board 56 to the main control board 31 via data transfer link 53.
- the main control board 31 includes a serial output port coupled to a connector on the housing operative to transfer the decoded data or image data to a remote terminal through a cable connection (not ⁇ hown) .
- the connector may be a traditional pin connector to which a mating connector is secured.
- the connector may be conductive contact surfaces 333 on the exterior of the housing 12 which align with mating contact surfaces when the device is placed in a docking station.
- the sy ⁇ tem include ⁇ a spread spectrum radio board 33 providing a wireles ⁇ link between the main control board 31 and a remote ho ⁇ t computer.
- External antenna 46 a ⁇ shown in figure 10, or internal antenna 47 as shown in figure 11, operate to improve reception.
- the spread spectrum board 33 include ⁇ digital and analog circuitry for tran ⁇ mitting and receiving data in a wireless network such a ⁇ an IEEE 802.11 compatible direct ⁇ equence ⁇ pread spectrum or frequency hopping spread spectrum network.
- the radio should not operate during a dataform reading ⁇ ession and a dataform reading session should not start during communication to limit peak current draw. Therefore, the radio and the circuitry controlling the dataform reading se ⁇ sion provide blocking signals to each other to assure that power i ⁇ not being drawn simultaneously.
- the blocking signal from the radio to the dataform reading circuitry will prevent the initiation of a reading se ⁇ ion.
- the ⁇ e ⁇ sion will be delayed until the signal desists.
- the blocking signal from the dataform reading circuitry to the radio will prevent the radio from sending or receiving data packets.
- the network transmi ⁇ sion protocol must be ⁇ uch that the radio in the portable dataform reader has complete control over when to transmit a packet and when it can receive a data packet.
- One such network protocol is the reverse poll protocol as de ⁇ cribed in US Patent 5,276,680 and a ⁇ signed to Telesystems S/W Inc. , the entire contents of which is hereby incorporated by reference.
- the portable device radio may transmit data packets to a network acce ⁇ point at any time, subject to the carrier frequency being free.
- the acces ⁇ point can only ⁇ end a packet to the portable device within a time window following receipt of a packet from the portable device.
- An image compression algorithm useful to reduce the size of a digital image file is the two-dimensional wavelet transform as described in A 64kb/s Video Code Using the 2-D Wavelet Transform by A.S. Lewis and G. Knowles, published in IEEE Computer Society Press, Order Number 2202.
- the HARC wavelet transform system available from Houston Advance Research Center in Houston Texas, can be used to compress the photographic image before it is tran ⁇ mitted with an image compre ⁇ ion ratio of up to 400:1.
- the data collection sy ⁇ tem of this invention includes a voice mail proces ⁇ ing board 37 so that the operator may verbally communicate with others through the spread ⁇ pectrum network.
- a block diagram of the voice mail circuitry is shown which may be embodied in a microprocessor system or voice mail processing board 33 and terminal control board 31.
- a voice message is input through an audio input circuit 92 which can include an internal microphone or a port for connection to an external microphone which will be discussed in more detail later.
- a digitizer/compres ⁇ ion module 94 will create a digital data file representative of the audio input.
- the message control unit 98 will prompt the operator to identify the addressee.
- the prompt may take the form of an audible signal to the operator through the audio output circuit 100 (discu ⁇ ed later) , or a display screen message.
- the operator In a time window following the prompt, the operator must identify the addressee. This can be done through the keyboard 22 or touch panel 44 (shown in figures 8-9) . Alternatively, the addressee may be identified by audio input. In this embodiment, voice recognition circuitry 102 will operate to convert the audio signal to a digital address.
- the mes ⁇ age control unit 98 will add the address to the message and relay the message to the spread spectrum transceiver for broadcast to the addressee. It should be appreciated that the voice mail sy ⁇ tem could require operator identification of the addre ⁇ see before or after input of the message.
- the mes ⁇ age control unit 98 operate ⁇ to receive data files repre ⁇ entative of incoming voice mail mes ⁇ age ⁇ and ⁇ tore ⁇ such me ⁇ sages in memory 96. Upon receipt of an incoming mes ⁇ age, the control unit 98 notifie ⁇ the operator of receipt through the audio output circuit 100, the display screen or a dedicated illuminator.
- control unit 98 Upon an operator prompt to output the voice mail mes ⁇ age, the control unit 98 will retrieve the data file from memory. A decompression module will convert the data file to an analog signal and audio output circuitry, which may include a speaker or a port for a remote speaker or headset will output the mes ⁇ age. The operator prompt to output the me ⁇ age may be through the keyboard 22, touch panel 44 or the voice input circuit 92.
- the voice mail unit of this invention can optionally store the message for later playback or erase the mes ⁇ age.
- the mes ⁇ age may be forwarded or re ⁇ ponded to.
- the control unit will prompt the operator to input the various permutations of these options. If the mes ⁇ age i ⁇ stored, the digital data file will remain in memory 96. If forwarded, the data file, or a copy, will be appropriately addre ⁇ sed and transmitted to the spread radio 33.
- the identity of the addre ⁇ of the response message is known and the control unity 98 prompts the operator to input a respon ⁇ e me ⁇ sage.
- the digital data file representative thereof is sent by the ⁇ pread radio.
- the ⁇ peaker 50 and the microphone 52 are preferably po ⁇ itioned ⁇ o that the reader may be held along the ⁇ ide of the operators face like a telephone set for communication.
- the speaker and microphone are embodied in a wireles ⁇ head ⁇ et.
- the headset includes a headband 115 for holding the device on an operator ⁇ head, a speaker 117 positioned near the operators ear and a microphone 119 positioned near the operator ⁇ mouth.
- a microradio module and power ⁇ ource are located in a housing 121 attached to the headset.
- the housing includes a similar micro-radio embodied on board 35 for transcieving audio ⁇ ignals with the headset.
- the micro-radio operates on a narrow band modulation ⁇ cheme wherein the band i ⁇ aligned in a null of the frequency ⁇ pectrum of the ⁇ pread ⁇ pectrum radio.
- the micro-radio can function as a wireles ⁇ peripheral port ⁇ o that the operator may print a dataform label without phy ⁇ ically connecting the data collection ⁇ y ⁇ tem to a printer.
- Printer ⁇ or other peripheral devices with similar micro-radio boards may be placed throughout the installation in which the data collection system is operated. When an operator approaches the peripheral device with the system, a hand shake sequence is initiated and a wireless link is established. Data may then be printed out on the peripheral device.
- the power source 48 provide for operation over an extended period of time without requiring recharging.
- the power ⁇ ource 48 could be any rechargeable cell
- the flexible sheet form factor is such that the cells may be folded and placed in areas of the housing which are of inadequate space for traditional cylindrical cells.
- the polymer sheet cell ⁇ 48 are advantageou ⁇ ly ⁇ hown along the ⁇ urface of the hou ⁇ ing interior wherein the polymer cell ⁇ al ⁇ o function to reduce unwanted EMS.
- the lithium polymer cell ⁇ are rechargeable and provide about 3 time ⁇ the energy density as the NiCad cell ⁇ and do not suffer the NiCad crystallization that produces the degenerative memory effect.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CA002200476A CA2200476C (en) | 1995-07-25 | 1996-07-25 | Extended working range dataform reader with reduced power consumption |
JP9507718A JPH10507560A (en) | 1995-07-25 | 1996-07-25 | Low power extension work area data form reader |
EP96926765A EP0782734B1 (en) | 1995-07-25 | 1996-07-25 | Extended working range dataform reader with reduced power consumption |
AU66796/96A AU699237B2 (en) | 1995-07-25 | 1996-07-25 | Extended working range dataform reader with reduced power consumption |
MXPA/A/1997/001398A MXPA97001398A (en) | 1995-07-25 | 1997-02-24 | Reader of data form of extended work regime with reduced power consumption |
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US08/507,607 | 1995-07-25 | ||
US08/507,607 US5815200A (en) | 1994-07-26 | 1995-07-25 | Extended working range dataform reader with reduced power consumption |
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WO1997005560A1 true WO1997005560A1 (en) | 1997-02-13 |
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PCT/US1996/012184 WO1997005560A1 (en) | 1995-07-25 | 1996-07-25 | Extended working range dataform reader with reduced power consumption |
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EP (1) | EP0782734B1 (en) |
JP (1) | JPH10507560A (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP0782734B1 (en) | 2004-05-12 |
AU6679696A (en) | 1997-02-26 |
CA2200476C (en) | 2003-12-16 |
EP0782734A4 (en) | 2000-12-06 |
CA2200476A1 (en) | 1997-02-13 |
US5811774A (en) | 1998-09-22 |
EP0782734A1 (en) | 1997-07-09 |
JPH10507560A (en) | 1998-07-21 |
MX9701398A (en) | 1998-03-31 |
AU699237B2 (en) | 1998-11-26 |
US5815200A (en) | 1998-09-29 |
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