US20150193644A1 - Decodable indicia reading terminal with combined illumination - Google Patents
Decodable indicia reading terminal with combined illumination Download PDFInfo
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- US20150193644A1 US20150193644A1 US14/660,970 US201514660970A US2015193644A1 US 20150193644 A1 US20150193644 A1 US 20150193644A1 US 201514660970 A US201514660970 A US 201514660970A US 2015193644 A1 US2015193644 A1 US 2015193644A1
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- light bar
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
- G06K7/10732—Light sources
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10554—Moving beam scanning
- G06K7/10564—Light sources
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
Definitions
- a decodable indicia reading terminal comprising a laser-based scanner, an imager-based scanner, a central processing unit (CPU), and an illumination assembly.
- the laser-based scanner can include a laser source, a photo-detector, and an analog-to-digital (A/D) converter.
- the laser source can be configured to emit a laser beam onto a substrate bearing decodable indicia.
- the photo-detector can be configured to receive a beam of a variable intensity reflected by the decodable indicia, and to output a first analog signal representative of the variable intensity.
- the A/D converter can be configured to convert the first analog signal into a first digital signal.
- FIG. 3 illustrates a component diagram of a laser-based scanner which can be incorporated in one embodiment of the indicia reading terminal
- a product 1030 having decodable indicia 1032 may be scanned by the bi-optic scanner 1014 . If the decodable indicia 1032 is located on the bottom of the product 1030 , one or more of the scan lines projected through the horizontal-scanning window 1020 can traverse the decodable indicia for decoding. If the decodable indicia 1032 is located on the side of the product, then an image of the decodable indicia can be captured by the imager-based scanner 1028 and processed for decoding.
- laser scanner 12 can include various interface circuits allowing CPU 84 to communicate with various circuits of scanner 12 including first interface circuit 88 coupled to laser source control circuit 60 and system bus 90 , second interface circuit 92 coupled to motor control circuit 72 , and third interface circuit 94 coupled to electrical power input unit 96 .
- image sensor assembly 1000 can also include a number of peripheral devices such as display 150 for displaying such information as image frames captured with use of image sensor assembly 100 , keyboard 152 , pointing device 154 , and trigger 156 which may be used to make active signals for activating frame readout and/or certain decoding processes.
- peripheral devices such as display 150 for displaying such information as image frames captured with use of image sensor assembly 100 , keyboard 152 , pointing device 154 , and trigger 156 which may be used to make active signals for activating frame readout and/or certain decoding processes.
- the decodable indicia reading terminal of A1, wherein said first wavelength reflects a state of said decodable indicia reading terminal.
- A3. The decodable indicia reading terminal of A1, wherein said indicator light bar can be in one of: ON state and OFF state, said state reflecting a state of said decodable indicia reading terminal.
- A4. The decodable indicia reading terminal of A1, wherein said imager based scanner further comprises a Bayer pattern filter.
- A12 The decodable indicia reading terminal of A1, wherein said illumination light bar is configured to pulse with a pre-defined frequency;
Abstract
A decodable indicia reading terminal can comprise a laser-based scanner, an imager-based scanner, a central processing unit (CPU), and an illumination assembly. The illumination assembly can include an indicator light bar and an illumination light bar. The ON/OFF state and color of the indicator light bar can reflect the state of the decodable indicia reading terminal. The illumination light bar can be configured to generate a high intensity illumination for illuminating the substrate bearing the decodable indicia. The wavelength of the light generated by the indicator light bar can be substantially equal to the wavelength of the light generated by the illumination light bar, and the light generated by the illumination light bar can have a very low perceived intensity.
Description
- The present application claims the benefit of U.S. patent application Ser. No. 13/174,333 for a Decodable Indicia Reading Terminal with Combined Illumination filed Jun. 30, 2011 (and published Jan. 3, 2013 as U.S. Patent Application Publication No. 2013/0001312), now U.S. Pat. No. 8,985,459. Each of the foregoing patent application, patent publication, and patent is hereby incorporated by reference in its entirety.
- This invention relates generally to decodable indicia reading terminals and, more specifically, to optical indicia reading terminals comprising a laser scanner.
- The use of optical indicia, such as bar code symbols, for product and article identification is well known in the art. Presently, various types of indicia reading terminals have been developed, such as hand-held bar code scanners, hands-free scanners, bi-optic in-counter scanners, and mobile computers such as personal digital assistants (PDAs).
- One common type of scan engine found in hand-held and retail scanners is the laser-based scan engine, which uses a focused laser beam to sequentially scan the bars and spaces of a bar code symbol pattern to be read. As the laser beam is scanned across the bar code symbol, a portion of the reflected light beam is collected by optics within the scanner. The collected light signal can subsequently be focused upon a photo-detector within the scanner. The photo-detector can, in one example, generate an analog electrical signal which can be converted into a digital signal representative of the bar code symbol.
- Another common type of indicia reading terminal is the digital imager, which includes 1D (linear) imagers and 2D (area) imagers. Digital imagers typically utilize light emitting diodes (LEDs) and a lens to focus the image of the bar code onto a multiple pixel image sensor, which is often provided by a complementary metal-oxide semiconductor (CMOS) image sensor that converts light signals into electric signals. The LEDs simultaneously illuminate all of the bars and spaces of a bar code symbol with light of a specific wavelength in order to capture an image for recognition and decoding purposes.
- In one embodiment, there is provided a decodable indicia reading terminal comprising a laser-based scanner, an imager-based scanner, a central processing unit (CPU), and an illumination assembly. The laser-based scanner can include a laser source, a photo-detector, and an analog-to-digital (A/D) converter. The laser source can be configured to emit a laser beam onto a substrate bearing decodable indicia. The photo-detector can be configured to receive a beam of a variable intensity reflected by the decodable indicia, and to output a first analog signal representative of the variable intensity. The A/D converter can be configured to convert the first analog signal into a first digital signal. The imager-based scanner can include a multiple pixel image sensor, an imaging lens, and an A/D converter. The imaging lens can be configured to focus an image of the decodable indicia on the image sensor. The A/D converter can be configured to convert into a second digital signal a second analog signal read out of the image sensor and representative of light incident on the image sensor. The CPU can be configured to output a decoded message data corresponding to the decodable indicia by processing the first digital signal and/or the second digital signal. The illumination assembly can include an indicator light bar and an illumination light bar. The ON/OFF state and color of the indicator light bar can reflect the state of the decodable indicia reading terminal. The illumination light bar can be located spatially close to the indicator light bar and can be configured to generate a high intensity illumination for illuminating the substrate bearing the decodable indicia. The wavelength of the light generated by the indicator light bar can be substantially equal to the wavelength of the light generated by the illumination light bar, and the light generated by the illumination light bar can have a very low perceived intensity.
- The features described herein can be better understood with reference to the drawings described below. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the drawings, like numerals are used to indicate like parts throughout the various views.
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FIG. 1 schematically illustrates one embodiment of a decodable indicia reading terminal; -
FIG. 2 schematically illustrates one embodiment a point-of-sale workstation comprising a decodable indicia reading terminal; -
FIG. 3 illustrates a component diagram of a laser-based scanner which can be incorporated in one embodiment of the indicia reading terminal; -
FIG. 4 illustrates a component diagram of an imager-based scanner which can be incorporated in one embodiment of the indicia reading terminal. - One of the key challenges for bar code scanning and imaging is the requirement of intense illumination. The magnitude of illumination intensity is directly correlated to the motion tolerance performance of the bar code scanning device. Current product development of the hybrid (laser/imaging) bi-optic devices demands that the embedded imager perform with extremely high motion tolerance but yield the lowest illumination intensity possible.
- In one embodiment, there is provided a decodable
indicia reading terminal 10 schematically shown inFIG. 1 . The decodableindicia reading terminal 10 can include afirst scanning window 18 and asecond scanning window 20. Thefirst scanning window 18 can be positioned in a first section 4 of scanningterminal housing 8, while thesecond scanning window 20 can be positioned in asecond section 6 of scanningterminal housing 8. As illustrated, thefirst scanning window 18 andsecond scanning window 20 can be substantially orthogonal to each other. In some embodiments, thefirst scanning window 18 andsecond scanning window 20 may be arranged side by side, or thefirst scanning window 18 andsecond scanning window 20 may be arranged at an angle less than 90° with respect to each other. - In a further aspect, the decodable
indicia reading terminal 10 can comprise a laser-based scanner which can be located behind thefirst scanning window 18 or thesecond scanning window 20. - In a further aspect, the decodable
indicia reading terminal 10 can further comprise a one-dimensional (1D) or two-dimensional (2D) imager-based scanner which can be located behind one of the scanningwindows - In one embodiment, the decodable indicia reading terminal can be incorporated into a point-of-sale workstation used by retailers to process purchase transactions involving products bearing decodable indicia, e.g., a UPC symbol, as shown in
FIG. 2 . The point-of-sale workstation 1010 can include ahorizontal countertop 1012 for placement of products to be scanned. A decodable indicia reading terminal provided by abi-optic scanner 1014 can be mounted within thecountertop 1012. The bi-opticscanner 1014 can include a horizontally-disposedhousing portion 1016 and a vertically disposedhousing portion 1018 which can project from one end of the horizontally-disposed housing portion in a substantially orthogonal manner. - In one embodiment, the horizontally-disposed
housing portion 1012 can comprise a first laser-based indicia scanner and the vertically-disposedhousing portion 1018 can comprise a second laser-based indicia scanner and an imager-based scanner. Thecountertop 1012 can include an optically transparent (e.g., glass) horizontal-scanning window 1020 which can be mounted flush with the checkout counter, and can be covered by an imagingwindow protection plate 1022 having a pattern ofapertures 1024 a. These apertures 1024 permit the projection of a plurality of vertical illumination planes from the first laser-based scanner located beneath the horizontal-scanning window 1020. The vertically-disposedhousing portion 1018 of the bi-opticscanner 1014 can further include a vertical-scanning window 1026 behind which the second laser-based scanner 1027 and the imager-based scanner 1028 can be housed. - In another embodiment, a second imager-based scanner can be disposed behind the
horizontal scanning window 1020. A skilled artisan would appreciate the fact that other ways of disposing the scanners and scanning windows are within the scope of this disclosure. - A
product 1030 havingdecodable indicia 1032 may be scanned by the bi-opticscanner 1014. If thedecodable indicia 1032 is located on the bottom of theproduct 1030, one or more of the scan lines projected through the horizontal-scanning window 1020 can traverse the decodable indicia for decoding. If thedecodable indicia 1032 is located on the side of the product, then an image of the decodable indicia can be captured by the imager-based scanner 1028 and processed for decoding. - As used herein, “decodable indicia” is intended to denote a representation of a message, such as the representation in a bar code symbology of a character string comprising alphanumeric and non-alphanumeric characters. Decodable indicia can be used to convey information, such as the identification of the source and the model of a product, for example in a UPC bar code that comprises twelve encoded symbol characters representing numerical digits.
- In one embodiment, the
workstation 1010 can further include a radio frequency identification (RFID)reader 1034; acredit card reader 1036; a wide-area wireless (WIFI)interface 1038 including RF transceiver andantenna 1040 for connecting to the TCP/IP layer of the Internet as well as one or more storing and processing relational database management system (RDBMS)server 1042; a Bluetooth 2-way communication interface 1044 including RF transceivers andantenna 1046 for connecting to Bluetooth-enabled hand-held scanners, imagers, PDAs, portable computers and the like 1048, for control, management, application and diagnostic purposes. Theworkstation 1010 can further include an electronicweight scale module 1050 employing one or more load cells positioned centrally below the system's structurally rigid platform for bearing and measuring substantially all of the weight of objects positioned on the horizontal-scanning window 1020 orwindow protection plate 1022, and generating electronic data representative of measured weight of such objects. - The bi-optic scanner configuration described herein supra is exemplary, and is not limited to a construction having horizontal and vertical scan windows. In another embodiment, a bi-optic scanner can include a single scan window, with a laser-based scanner and an imager-based scanner disposed behind it. A skilled artisan would appreciate the fact that other arrangements of the laser-based scanner and imager-based scanner within the housing of the decodable indicia reading terminal and relative to one or more scanning windows are within the scope of this disclosure.
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FIG. 3 illustrates a component diagram of a laser-based scanner which can be incorporated in one embodiment of theindicia reading terminal 10 ofFIG. 1 . The laser-based scanner 12 can comprise alens assembly 54, which can include a fixed lens, a variable position lens holder adapted for use with a moveable lens system, or a variable focus fluid lens, for example. The laser scanner 12 can further comprise alaser source 56 which can emit a laser beam. Thelaser source 56 can be coupled to a lasersource control circuit 60. Light from thelaser source 56 can be shaped by the collimatingoptics 62 and thelens assembly 54. The combination of thelaser source 56 and thecollimating optics 62 can be regarded as alaser diode assembly 64. The laser beam emitted by thelaser source 56 can illuminate thesubstrate 28, which in one embodiment can bear thedecodable indicia 30. Ascanning mirror reflector 68 disposed within the optical path of the laser beam emitter by thelaser source 56 can oscillate to direct the laser beam across the entire surface to be scanned.Reflector 68 can be driven by ascan motor 70 which can be coupled to controlcircuit 72. - The laser beam emitted by the
laser source 56 can reflect off theproduct 28 and then travel back to the photo-detector assembly 76. In the example wherein theproduct 28 includes a bar code, the incident laser light can be reflected by areas of dark and white bands. The reflected beam can thus have variable intensity representative of the bar code pattern. Photo-detector assembly 76 including photo-detector 78 and analog-to-digital (A/D)converter 80 can receive the reflected beam of variable intensity, generate an analog signal corresponding to the reflected beam, and convert it to a digital signal representative of the beam intensity for storage intomemory 82 where it can be processed byCPU 84 in accordance with a program stored in thenon-volatile memory 86, provided in a particular example by an EPROM. - For attempting to decode a bar code symbol,
CPU 84 can process a digital signal corresponding to the reflected laser beam to determine a spatial pattern of dark cells and light cells and can then convert each light and dark cell pattern determined into a character of character string via table lookup, and finally can output a decoded message data corresponding to the decodable indicia. - In a further aspect, laser scanner 12 can include various interface
circuits allowing CPU 84 to communicate with various circuits of scanner 12 includingfirst interface circuit 88 coupled to lasersource control circuit 60 andsystem bus 90,second interface circuit 92 coupled tomotor control circuit 72, andthird interface circuit 94 coupled to electrical power input unit 96. - Referring now to
FIG. 4 , described is a component diagram of an imager-based scanner which can be incorporated in one embodiment of theindicia reading terminal 10 ofFIG. 1 . The imager-based scanner 98 can comprise a multiple pixel image sensor assembly 100, or optical imager, such as a CCD image sensor or a CMOS image sensor. - The image sensor assembly 100 can include an
image sensor 102 comprising a multiplepixel image sensor 104 having pixels arranged in rows and columns of pixels,column circuitry 106, androw circuitry 108. Associated with theimage sensor 102 can beamplifier circuitry 110, and an A/D converter 112 which can convert image information in the form of analog signals read out of multiplepixel image sensor 104 into image information in the form of digital signals.Image sensor 102 can also have an associated timing andcontrol circuit 114 for use in controlling, e.g., the exposure period ofimage sensor 102, and/or gain applied to theamplifier 110. Thenoted circuit components circuit 116. - In one embodiment, image sensor integrated
circuit 116 can incorporate a Bayer pattern filter, andCPU 118 prior to subjecting a frame to further processing can interpolate pixel values for development of a monochrome frame of image data. - In the course of operation of the image sensor assembly 100, image signals can be read out of
image sensor 102, converted, and stored into a system memory such asRAM 120. Amemory 122 of image sensor assembly 100 can includeRAM 120, a nonvolatile memory such asEPROM 124, and astorage memory device 126 such as may be provided by a flash memory or a hard drive memory. In one embodiment, image sensor assembly 100 can includeCPU 118 which can be adapted to read out image data stored inmemory 122 and subject such image data to various image processing algorithms. Image sensor assembly 100 can include a direct memory access unit (DMA) 128 for routing image information read out fromimage sensor 102 that has been subject to conversion toRAM 120. In another embodiment, image sensor assembly 100 can employ a system bus providing for bus arbitration mechanism (e.g., a PCI bus) thus eliminating the need for a central DMA controller. A skilled artisan would appreciate that other embodiments of the system bus architecture and/or direct memory access components providing for efficient data transfer between theimage sensor 102 andRAM 120 are within the scope of this disclosure. - In a further aspect, the image sensor assembly 100 can include an
imaging lens assembly 130 for focusing an image of thedecodable indicia 30 ontoimage sensor 102. Imaging light rays can be transmitted about anoptical axis 132.Lens assembly 130 can be controlled with use of lensassembly control circuit 144. Lensassembly control circuit 144 can send signals tolens assembly 130, e.g., for changing a focal length and/or a best focus distance oflens assembly 130. - The image sensor assembly 100 can further include a
filter module 140 that comprises one or more optical filters, as well as in some embodiments anactuator assembly 142 that is coupled generally to the filter module, such as to the optical filters. Thefilter module 140 can be located on either side of theimaging lens assembly 130. Likewise, one or more of the optical filters within thefilter module 140 can be disposed on one or more surfaces of theimaging lens assembly 130 and/or theimage sensor 102.Filter module 140 can be controlled with use of a filtermodule control circuit 148, which can be coupled to theactuator assembly 142. - Although not incorporated in the illustrated embodiments, image sensor assembly 1000 can also include a number of peripheral devices such as
display 150 for displaying such information as image frames captured with use of image sensor assembly 100,keyboard 152, pointingdevice 154, and trigger 156 which may be used to make active signals for activating frame readout and/or certain decoding processes. - Image sensor assembly 100 can include various interface circuits for coupling several of the peripheral devices to system address/data bus (system bus)
bus 158, for communication withsecond CPU 118 also coupled tosystem bus 158. Image sensor assembly 100 can includeinterface circuit 160 for coupling image sensor timing and control circuit timing andcontrol circuit 114 tosystem bus 158,interface circuit 162 for coupling the lensassembly control circuit 144 tosystem bus 158,interface circuit 164 for coupling the illuminationassembly control circuit 146 tosystem bus 158,interface circuit 166 for coupling thedisplay 150 tosystem bus 158,interface circuit 168 forcoupling keyboard 152, pointingdevice 154, and trigger 156 tosystem bus 158, andinterface circuit 170 for coupling the filtermodule control circuit 148 tosystem bus 158. - In a further aspect, image sensor assembly 100 can include one or more I/O interfaces 172, 174 for providing communication with external devices (e.g., a cash register server, a store server, an inventory facility server, a image sensor assembly 100, a local area network base station, a cellular base station). I/O interfaces 172, 174 can be interfaces of any combination of known computer interfaces, e.g., Ethernet (IEEE 802.3), USB, IEEE 802.11, Bluetooth, CDMA, and GSM.
- In order to capture an image by the imager-based scanner 98, the decodable indicia bearing substrate generally needs to be illuminated with a high intensity illumination in order to decrease the required exposure time. While integration of an imager-based scanner into a laser scanner-based system can compensate for known laser-based scanner shortcomings and improve the overall scanning performance, the illumination requirement can present a challenge, since a typical end user of the decodable indicia reading terminal can be accustomed to low intensity light emitted by traditional laser-based scanners, and hence presence of additional intense light source can cause end user's distraction resulting in reduced customer satisfaction.
- In one embodiment, the decodable
indicia reading terminal 10 can include anillumination assembly 134 that can comprise anillumination light bar 136 for generating an illumination pattern substantially corresponding to the field of view of the image sensor assembly 100, and an indicatorlight bar 138. Each ofillumination light bar 136 and indicator light bar indicatorlight bar 138 can include one or more LEDs. Theillumination assembly 134 comprisingillumination light bar 136 and indicator light bar indicatorlight bar 138 can be controlled by an illuminationassembly control circuit 146. - The ON/OFF state and color of the indicator light bar can reflect the state of the decodable indicia reading terminal. In one embodiment, the indicator light bar can remain lit whenever the bi-optic scanner is powered on. In one embodiment, the state and/or color of the indicator light bar can change responsive to scanning decodable indicia (e.g., a bar code). In one example, the indicator light bar can constantly emit red light to indicate the powered state of the bi-optic scanner, and can switch to blinking red light responsive to scanning decodable indicia. A skilled artisan would appreciate the fact that other modes of indicator light bar functioning are within the scope of this disclosure.
- In one embodiment, the illumination light source can be “camouflaged” by locating the
illumination light bar 136 spatially close to the indicatorlight bar 138 which already exists in a typical laser scanner-based system, as best viewed inFIG. 1 . Theoptics 141 which in one embodiment can be incorporated in thelight bar housing 143 can include both diffusing and directing optical properties. - In a further aspect, the
light bar optics 141 can diffuse the light emitted by the light bars 136, 138 across thehorizontal surface 145 of the decodable indicia reading terminal'shousing 8. In one embodiment, the face of thehorizontal surface 145 can be textured in order to further diffuse and soften the light emitted by thelight sources - In one embodiment, the decodable indicia reading terminal can further comprise an additional set of light bar optics 147 provided by cylindrical or wedge shaped lenses that can further disperse the light emitted by the
light sources horizontal surface 145, so that any observable side view of the light emitted by thelight sources - In a further aspect, the
illumination light source 136 can emit light of the red spectrum region, where the human eye is less responsive as compared to the green spectrum region. In one embodiment, the indicatinglight source 138 and theillumination light source 136 can emit light of the same wavelength, so that the color of the illumination light emitted by theillumination light source 136 could not be distinguished by the user of the decodable indicia reading terminal from the color of the indicating light emitted by the indicatinglight source 138. - In a further aspect, the illumination light LEDs can be pulsed with a pre-defined frequency in order to shorten the LED duty cycle. In one embodiment, the frequency of illumination pulses can be equal to the imager frame rate. In a further aspect, the pulse duration can be minimized. In one embodiment, the pulse duration can be equal to the imager integration time. In another embodiment, the pulse duration can be shorter than the imager integration time. In a yet another embodiment, the pulse duration can be shorter than a typical human eye integration time. In an illustrative embodiment, the illumination pulse frequency can be 60 cycles per second, each pulse having duration of 100 μs, thus producing a duty cycle of approximately 1.5%.
- The “camouflaged” illumination light source can produce illumination with perceived intensity being very low, thus improving user experience and increasing user satisfaction.
- A sample of systems and methods that are described herein follows:
- A1. A decodable indicia reading terminal comprising:
- a laser-based scanner disposed within a housing, said laser-based scanner including a laser source configured to emit a laser beam onto a substrate bearing decodable indicia, a photo-detector configured to receive a second beam of a variable intensity reflected by said decodable indicia and to output a first analog signal representative of said variable intensity, and a first analog-to-digital (A/D) converter configured to convert said first analog signal into a first digital signal representative of said first analog signal;
- an imager-based scanner disposed within said housing, said imager-based scanner including a multiple pixel image sensor, an imaging lens configured to focus an image of said decodable indicia on said image sensor, and a second A/D converter configured to convert into a second digital signal a second analog signal read out of said image sensor, said second analog signal representative of light incident on said image sensor, said second digital signal representative of said second analog signal;
- a central processing unit (CPU) configured to output a decoded message data corresponding to said decodable indicia by processing at least one of: said first digital signal, said second digital signal;
- an illumination assembly including an indicator light bar configured to emit first light having a first wavelength, and an illumination light bar configured to generate an illumination having a high intensity for illuminating said substrate, by emitting second light having a second wavelength;
- wherein said first wavelength is substantially equal to said second wavelength; and
- wherein said second light has a low perceived intensity.
- A2. The decodable indicia reading terminal of A1, wherein said first wavelength reflects a state of said decodable indicia reading terminal.
A3. The decodable indicia reading terminal of A1, wherein said indicator light bar can be in one of: ON state and OFF state, said state reflecting a state of said decodable indicia reading terminal.
A4. The decodable indicia reading terminal of A1, wherein said imager based scanner further comprises a Bayer pattern filter.
A5. The decodable indicia reading terminal of A1, wherein said illumination bar is located spatially close to said indicator light bar.
A6. The decodable indicia reading terminal of A1, wherein said illumination assembly further includes optics having diffusing and directing optical properties.
A7. The decodable indicia reading terminal of A1, wherein said illumination assembly further includes optics having diffusing and directing optical properties, said optics provided by one or more cylindrical- or wedge-shaped lens.
A8. The decodable indicia reading terminal of A1, wherein said indicator light bar includes one or more light-emitting diodes (LEDs).
A9. The decodable indicia reading terminal of A1, wherein said illumination light bar includes one or more LEDs.
A10. The decodable indicia reading terminal of A1, wherein said illumination light bar is configured to pulse with a pre-defined frequency.
A11. The decodable indicia reading terminal of A1, wherein said illumination light bar is configured to pulse with a frequency equal to a frame rate of said image sensor.
A12. The decodable indicia reading terminal of A1, wherein said illumination light bar is configured to pulse with a pre-defined frequency; and - wherein a duration of pulses is equal to an integration time of said image sensor.
- A13. The decodable indicia reading terminal of A1, wherein said illumination light bar is configured to pulse with a pre-defined frequency; and
- wherein a duration of pulses is shorter than an integration time of said image sensor.
- A14. The decodable indicia reading terminal of A1, wherein said illumination light bar is configured to pulse with a pre-defined frequency; and
- wherein a duration of pulses is shorter than an integration time of a typical human eye.
- While the present invention has been described with reference to a number of specific embodiments, it will be understood that the true spirit and scope of the invention should be determined only with respect to claims that can be supported by the present specification. Further, while in numerous cases herein wherein systems and apparatuses and methods are described as having a certain number of elements it will be understood that such systems, apparatuses and methods can be practiced with fewer than the mentioned certain number of elements. Also, while a number of particular embodiments have been described, it will be understood that features and aspects that have been described with reference to each particular embodiment can be used with each remaining particularly described embodiment.
Claims (20)
1. A decodable indicia reading terminal comprising:
an illumination assembly comprising:
an indicator light bar configured to emit first light having a first wavelength; and
an illumination light bar configured to generate illumination for illuminating a surface bearing an indicia by emitting second light having a second wavelength;
a central processing unit (CPU) configured to decode the indicia; and
optics for diffusing the first light;
wherein the first wavelength is substantially equal to the second wavelength; and
wherein the indicator light bar is located spatially close to the illumination light bar such that the indicator light bar camouflages the illumination light bar.
2. The decodable indicia reading terminal of claim 1 , comprising a laser-based scanner for generating a first signal representative of light reflected from the indicia, wherein the CPU is configured to decode the indicia based on the first signal.
3. The decodable indicia reading terminal of claim 1 , comprising an imager-based scanner for generating a second signal representative of an image of the indicia, wherein the CPU is configured to decode the indicia based on the second signal.
4. The decodable indicia reading terminal of claim 1 , comprising:
a laser-based scanner for generating a first signal representative of light reflected from the indicia through a horizontal window, wherein the CPU is configured to decode the indicia based on the first signal; and
an imager-based scanner for generating a second signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the second signal.
5. The decodable indicia reading terminal of claim 1 , comprising:
a laser-based scanner for generating a first signal representative of light reflected from the indicia through a horizontal window, wherein the CPU is configured to decode the indicia based on the first signal;
a first imager-based scanner for generating a second signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the second signal; and
a second imager-based scanner for generating a third signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the third signal.
6. The decodable indicia reading terminal of claim 1 , wherein:
the decodable indicia reading terminal is configured so that the indicator light bar is capable of being in an on state while the illumination bar is in an off state; and
the indicator light bar changes the color emitted and/or its state responsive to scanning indicia.
7. The decodable indicia reading terminal of claim 1 , comprising a horizontal surface that is textured to diffuse the first light and the second light.
8. A decodable indicia reading terminal comprising:
a light bar housing;
an illumination assembly comprising:
an indicator light bar within the light bar housing configured to emit first light having a first wavelength; and
an illumination light bar within the light bar housing configured to generate illumination for illuminating a surface bearing an indicia by emitting second light having a second wavelength;
a central processing unit (CPU) configured to decode the indicia; and
optics for diffusing the first light;
wherein the first wavelength is substantially equal to the second wavelength; and
wherein the indicator light bar is located spatially close to the illumination light bar such that the indicator light bar camouflages the illumination light bar.
9. The decodable indicia reading terminal of claim 8 , comprising a laser-based scanner for generating a first signal representative of light reflected from the indicia, wherein the CPU is configured to decode the indicia based on the first signal.
10. The decodable indicia reading terminal of claim 8 , comprising an imager-based scanner for generating a second signal representative of an image of the indicia, wherein the CPU is configured to decode the indicia based on the second signal.
11. The decodable indicia reading terminal of claim 8 , comprising:
a laser-based scanner for generating a first signal representative of light reflected from the indicia through a horizontal window, wherein the CPU is configured to decode the indicia based on the first signal; and
an imager-based scanner for generating a second signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the second signal.
12. The decodable indicia reading terminal of claim 8 , comprising:
a laser-based scanner for generating a first signal representative of light reflected from the indicia through a horizontal window, wherein the CPU is configured to decode the indicia based on the first signal;
a first imager-based scanner for generating a second signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the second signal; and
a second imager-based scanner for generating a third signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the third signal.
13. The decodable indicia reading terminal of claim 8 , wherein:
the decodable indicia reading terminal is configured so that the indicator light bar is capable of being in an on state while the illumination bar is in an off state; and
the indicator light bar changes the color emitted and/or its state responsive to scanning indicia.
14. The decodable indicia reading terminal of claim 8 , comprising a horizontal surface that is textured to diffuse the first light and the second light.
15. A decodable indicia reading terminal comprising:
an illumination assembly comprising:
an indicator light bar configured to emit first light having a first wavelength; and
an illumination light bar configured to generate illumination for illuminating a surface bearing an indicia by emitting second light having a second wavelength;
a central processing unit (CPU) configured to decode the indicia; and
optics for diffusing the first light;
wherein the first wavelength is substantially equal to the second wavelength;
wherein the indicator light bar is located spatially close to the illumination light bar such that the indicator light bar camouflages the illumination light bar; and
wherein the indicator light bar is responsive to a scanning of decodable indicia.
16. The decodable indicia reading terminal of claim 15 , comprising an imager-based scanner for generating a second signal representative of an image of the indicia, wherein the CPU is configured to decode the indicia based on the second signal.
17. The decodable indicia reading terminal of claim 15 , comprising:
a laser-based scanner for generating a first signal representative of light reflected from the indicia through a horizontal window, wherein the CPU is configured to decode the indicia based on the first signal; and
an imager-based scanner for generating a second signal representative of an image of the indicia captured through a vertical window, wherein the CPU is configured to decode the indicia based on the second signal.
18. The decodable indicia reading terminal of claim 15 , wherein:
the decodable indicia reading terminal is configured so that the indicator light bar is capable of being in an on state while the illumination bar is in an off state; and
the indicator light bar changes the color emitted and/or its state responsive to scanning indicia.
19. The decodable indicia reading terminal of claim 15 , comprising a horizontal surface that is textured to diffuse the first light and the second light.
20. The decodable indicia reading terminal of claim 15 , wherein the illumination light bar is activated using illumination pulses with an illumination pulse being active during an integration time of the imager-based scanner.
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US13/174,333 US8985459B2 (en) | 2011-06-30 | 2011-06-30 | Decodable indicia reading terminal with combined illumination |
US14/660,970 US20150193644A1 (en) | 2011-06-30 | 2015-03-18 | Decodable indicia reading terminal with combined illumination |
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US13/174,333 Expired - Fee Related US8985459B2 (en) | 2011-06-30 | 2011-06-30 | Decodable indicia reading terminal with combined illumination |
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