US20220100977A1 - Bioptic barcode reader - Google Patents
Bioptic barcode reader Download PDFInfo
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- US20220100977A1 US20220100977A1 US17/545,642 US202117545642A US2022100977A1 US 20220100977 A1 US20220100977 A1 US 20220100977A1 US 202117545642 A US202117545642 A US 202117545642A US 2022100977 A1 US2022100977 A1 US 2022100977A1
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- 238000003384 imaging method Methods 0.000 claims abstract description 94
- 238000005286 illumination Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Classifications
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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
- G06K7/10821—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 further details of bar or optical code scanning devices
- G06K7/1096—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 further details of bar or optical code scanning devices the scanner having more than one scanning window, e.g. two substantially orthogonally placed scanning windows for integration into a check-out counter of a super-market
-
- 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
- G06K7/10574—Multiple sources
-
- 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
- G06K7/10594—Beam path
- G06K7/10683—Arrangement of fixed elements
- G06K7/10702—Particularities of propagating elements, e.g. lenses, mirrors
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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
-
- 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
- G06K7/10821—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 further details of bar or optical code scanning devices
- G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms
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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
- G06K7/10821—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 further details of bar or optical code scanning devices
- G06K7/10861—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 further details of bar or optical code scanning devices sensing of data fields affixed to objects or articles, e.g. coded labels
Definitions
- Bioptic barcode readers traditionally use a camera/sensor and split the camera/sensor's field-of-view between vertical and horizontal windows, which creates a variety of challenges that must be solved through careful arrangement of the internal components.
- the fields-of-view through the vertical and horizontal windows are intrinsically tied together to the same camera/sensor, the options of how to arrange the internal components can be limited.
- the field-of-view through the horizontal window is tilted towards the tower/upper housing portion so that a portion of the field-of-view is not illuminated and cuts off a portion of the field-of-view.
- a substantial portion (10%) of the field-of-view through the horizontal window is typically lost because it is not illuminated without causing internal reflection issues.
- the present invention is a bioptic barcode reader having a housing having a lower housing portion with an upper surface facing a product scanning region and an upper housing portion extending above the lower housing portion.
- a generally horizontal window is positioned at the upper surface of the lower housing portion and is configured to allow a first light to pass between the product scanning region and an interior region of the housing.
- a generally upright window is positioned in the upper housing portion and is configured to allow a second light to pass between the product scanning region and the interior region of the housing.
- An illumination assembly has an illumination field-of-view and an imaging assembly, including an image sensor, has an imaging field-of-view with a centerline that is directed at an angle relative to the upper surface.
- a mirror arrangement is positioned within the interior region and is configured to split the imaging field-of-view along a horizontal axis into a first portion and a second portion, redirect the first portion of the imaging field-of-view through the generally upright window, and redirect the second portion of the imaging field-of-view and the illumination field-of-view through the generally horizontal window such that the second portion of the imaging field-of-view is uniformly covered by the illumination field-of-view at the generally horizontal window.
- the present invention is a bioptic barcode reader having a housing having a lower housing portion with an upper surface facing a product scanning region and an upper housing portion extending above the lower housing portion.
- a generally horizontal window is positioned at the upper surface of the lower housing portion and is configured to allow a first light to pass between the product scanning region and an interior region of the housing.
- a generally upright window is positioned in the upper housing portion and is configured to allow a second light to pass between the product scanning region and the interior region of the housing.
- An illumination assembly including a light emitting diode, has an illumination field-of-view and an imaging assembly, including an image sensor, has an imaging field-of-view with a centerline that is directed at an angle relative to the upper surface.
- a mirror arrangement is positioned within the interior region and includes a splitter mirror, a first mirror, and a second mirror.
- the splitter mirror is positioned directly in a first path of a first portion of the imaging field-of-view and is configured to split the imaging field-of-view along a horizontal axis and redirect the first portion of the imaging field-of-view from the first path to a second path towards the second mirror.
- the first mirror is positioned directly in a third path of a second portion of the imaging field-of-view and directly in a fourth path of the illumination field-of-view and is configured to redirect the second portion of the imaging field-of-view and the illumination field-of-view through the generally horizontal window such that the second portion of the imaging field-of-view is uniformly covered by the illumination field-of-view at the generally horizontal window and a reflection of the light emitting diodes is located outside of the second portion of the imaging field-of-view in the product scanning region.
- the second mirror is positioned directly in the second path and is configured to redirect the first portion through the generally upright window.
- FIG. 1 illustrates a side perspective view of an example bioptic barcode reader
- FIG. 2 illustrates a top view of the example barcode reader of FIG. 1 ;
- FIG. 3A is a cross-sectional view of the barcode reader of FIG. 2 taken along line A-A with a first example configuration of illumination and imaging assemblies;
- FIG. 3B is an enlarged view of a portion of the barcode reader of FIG. 3A ;
- FIG. 4A is a cross-sectional view of the barcode reader of FIG. 2 taken along line A-A with a second example configuration of illumination and imaging assemblies;
- FIG. 4B is an enlarged view of a portion of the barcode reader of FIG. 4A ;
- FIG. 5A is a cross-sectional view of the barcode reader of FIG. 2 taken along line A-A with a third example configuration of illumination and imaging assemblies;
- FIG. 5B is an enlarged view of a portion of the barcode reader of FIG. 5A ;
- FIG. 6A is a cross-sectional view of the barcode reader of FIG. 2 taken along line A-A with a fourth example configuration of illumination and imaging assemblies;
- FIG. 6B is an enlarged view of a portion of the barcode reader of FIG. 6A ;
- FIG. 7A is a cross-sectional view of the barcode reader of FIG. 2 taken along line A-A with a fifth example configuration of illumination and imaging assemblies;
- FIG. 7B is an enlarged view of a portion of the barcode reader of FIG. 7A .
- bioptic barcode readers where the centerline of the field-of-view of the camera/sensor is angled from horizontal, or the plane of the upper surface of the housing, at a specific angle to address the issues encountered by typical bioptic barcode readers.
- the fields-of-view through the vertical and horizontal windows should be located to maximize coverage of the windows.
- the field-of-view through the horizontal window should fill the window and provide good coverage from the far end of the window up to 5 inches above the upper surface and the field-of-view through the vertical window should fill the window as much as possible and also provide good coverage from the upper surface to 5 inches above the upper surface at the middle of the horizontal window.
- the illumination system should cover each of the fields-of-view uniformly both at the horizontal and vertical windows and up to 5 inches away from the windows.
- reflections of the illumination system should not be visible in the field-of-view of the camera/sensor.
- the internal path traveled by the fields-of-view should be such that the camera/sensor is focused near the upper surface of the horizontal window and focuses approximately 1-2 inches from the vertical window.
- the field-of-view of the camera/sensor through the horizontal window can be tilted so that it is not clipped by the tower, so the field-of-view of the camera/sensor is uniformly illuminated, and so the reflection of the illumination assembly is not within the field-of-view of the camera/sensor.
- This also allows the field-of-view of the camera/sensor to be split unevenly to allow for a larger portion of the field-of-view of the camera/sensor to be directed out of the vertical window, which allows the field-of-view through the vertical window to see higher above the upper surface and cover more of the vertical window. More uniformity of illumination, larger and non-clipped fields-of-view through the horizontal and vertical windows, and avoidance of reflections of the illumination assembly within the camera/sensor field-of-view results in a much better performing bioptic barcode reader.
- Bioptic barcode reader 10 can be configured to be supported by a workstation, such as a checkout counter at a POS of a retail store, and has a product scanning region 150 .
- Bioptic barcode reader 10 has a housing 100 with a lower housing portion 110 and an upper housing portion 135 that extends above lower housing portion 110 .
- Lower housing portion 110 has an upper surface 115 that faces product scanning region 150 and has a proximal end 120 proximate upper housing portion 135 and a distal end 125 that is generally parallel to and opposite proximal end 120 .
- a generally horizontal window 130 is positioned at upper surface 115 of lower housing portion 110 and is configured to allow a first light to pass between product scanning region 150 and an interior region 105 of housing 100 .
- Horizontal window 130 has a length L that extends from proximal end 120 of upper surface 115 towards distal end 125 and a width W that extends perpendicular to and is greater than length L. In the example shown, length L is approximately 4 inches and width W is approximately 4 1 ⁇ 2 inches.
- a generally upright window 140 is positioned in upper housing portion 135 and is configured to allow a second light to pass between product scanning region 150 and interior region 105 of housing 100 . The first and second lights intersect to define product scanning region 150 of bioptic barcode reader 10 where a product can be scanned for sale at the POS.
- bioptic barcode reader 10 is shown with a first example configuration of internal components.
- a printed circuit board 200 is positioned in interior region 105 of housing 100 and is oriented perpendicular (generally vertical) to upper surface 115 (generally horizontal).
- An illumination assembly 205 having an illumination field-of-view 210 , is mounted on printed circuit board 200 and can include one or more light emitting diodes or any other light source appropriate for a given application.
- An imaging assembly 225 having an imaging field-of-view 230 , has an image sensor 240 that is also mounted on printed circuit board 200 .
- Imaging field-of-view 230 of imaging assembly 225 has a centerline 235 that is directed at an angle a relative to upper surface 115 , which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees.
- imaging lens 250 of imaging assembly 225 has a central axis 255 that is parallel to and offset from a central axis 245 of image sensor 240 to redirect the field-of-view of image sensor 240 to imaging field-of-view 230 .
- a mirror arrangement 300 is also positioned within interior region 105 of housing 100 , is configured to divide imaging field-of-view 230 , and includes a splitter mirror 305 , first mirror 310 , and second mirror 315 .
- Splitter mirror 305 is positioned directly in a first path P 1 of first portion 231 of imaging field-of-view 230 and is configured to split imaging field-of-view 230 , preferably along a horizontal axis, into a first portion 231 and a second portion 232 .
- Splitter mirror 305 redirects first portion 231 through upright window 140 by redirecting first portion 231 from first path P 1 to a second path P 2 towards second mirror 315 .
- Second mirror 315 is positioned directly in second path P 2 and is configured to redirect first portion 231 of imaging field-of-view 230 through upright window 140 .
- First mirror 310 is positioned directly in a third path P 3 of second portion 232 of imaging field-of-view 230 and in a fourth path P 4 of illumination field-of-view 210 and is configured to redirect second portion 232 of imaging field-of-view 230 and illumination field-of-view 210 through horizontal window 130 , such that second portion 232 of imaging field-of-view 230 is uniformly covered by illumination field-of-view 210 at horizontal window 130 .
- splitter, first, and second mirrors 305 , 310 , 315 are planar mirrors, however, mirror arrangement 300 can various alternative configurations.
- first mirror 310 and/or second mirror 315 could be concave or convex mirrors, or multiple planar mirrors could be used, to reflect multiple fields-of-view through horizontal window 130 and upright window 140 , respectively.
- splitter mirror 305 could be a concave or convex mirror, or multiple planar mirrors could be used, to divide second path P 2 of first portion 231 into multiple fields-of-view that are directed towards multiple second mirrors and through upright window 140 .
- bioptic barcode reader 10 is shown with a second example configuration of internal components.
- printed circuit board 200 is positioned in interior region 105 of housing 100 and is oriented perpendicular to upper surface 115 .
- Illumination assembly 205 and imaging assembly 225 are mounted on printed circuit board 200 .
- Mounting illumination assembly 205 and image sensor 240 of imaging assembly 225 on the same printed circuit board 200 minimized cost and complexity for bioptic barcode reader 10 .
- Centerline 235 of imaging field-of-view 230 is directed at angle a relative to upper surface 115 , which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees.
- image sensor 240 is mounted on printed circuit board 200 at angle a relative to printed circuit board 200 .
- Mirror arrangement 300 in this example is the same as described above.
- bioptic barcode reader 10 is shown with a third example configuration of internal components.
- printed circuit board 200 is positioned in interior region 105 of housing 100 .
- Illumination assembly 205 and imaging assembly 225 are mounted on printed circuit board 200 .
- Mounting illumination assembly 205 and image sensor 240 of imaging assembly 225 on the same printed circuit board 200 minimized cost and complexity for bioptic barcode reader 10 .
- Centerline 235 of imaging field-of-view 230 is directed at angle a relative to upper surface 115 , which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees.
- printed circuit board 200 is aligned at angle a relative to an axis that is perpendicular to upper surface 115 .
- Mirror arrangement 300 in this example is the same as described above.
- bioptic barcode reader 10 is shown with a fourth example configuration of internal components.
- printed circuit board 200 is positioned in interior region 105 of housing 100 and is oriented perpendicular to upper surface 115 .
- Illumination assembly 205 and imaging assembly 225 are mounted on printed circuit board 200 .
- Mounting illumination assembly 205 and image sensor 240 of imaging assembly 225 on the same printed circuit board 200 minimized cost and complexity for bioptic barcode reader 10 .
- Centerline 235 of imaging field-of-view 230 is directed at angle a relative to upper surface 115 , which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees.
- imaging assembly 225 includes a prism 260 that is positioned in front of imaging lens 250 to redirect imaging field-of-view 230 at angle a.
- Mirror arrangement 300 in this example is the same as described above.
- bioptic barcode reader 10 is shown with a fifth example configuration of internal components.
- a first printed circuit board 200 A is positioned in interior region 105 of housing 100 and is aligned perpendicular to upper surface 115 and a second printed circuit board 200 B is positioned in interior region 105 and is aligned at angle a relative to an axis perpendicular to upper surface 115 .
- Illumination assembly 205 is mounted on first printed circuit board 200 A and imaging assembly 225 is mounted on second printed circuit board 200 B such that centerline 235 of imaging field-of-view 230 is directed at angle a relative to upper surface 115 , which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees.
- Mirror arrangement 300 in this example is the same as described above.
- second portion 232 of imaging field-of-view 230 that exits through horizontal window 130 is moved away from upper housing portion 135 and no longer intersects upper housing portion 135 , so that more of second portion 232 is available for scanning at greater distances from upper surface 115 .
- a reflection 215 of the light emitting diode(s) or other light source of illumination assembly is still located outside of second portion 232 in product scanning region 150 , which again provides more useful scanning area in second portion 232 .
- a includes . . . a”, “contains . . . a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises, has, includes, contains the element.
- the terms “a” and “an” are defined as one or more unless explicitly stated otherwise herein.
- the terms “substantially”, “essentially”, “approximately”, “about” or any other version thereof, are defined as being close to as understood by one of ordinary skill in the art, and in one non-limiting embodiment the term is defined to be within 10 %, in another embodiment within 5 %, in another embodiment within 1 % and in another embodiment within 0 . 5 %.
- the term “coupled” as used herein is defined as connected, although not necessarily directly and not necessarily mechanically.
- a device or structure that is “configured” in a certain way is configured in at least that way, but may also be configured in ways that are not listed.
- processors such as microprocessors, digital signal processors, customized processors and field programmable gate arrays (FPGAs) and unique stored program instructions (including both software and firmware) that control the one or more processors to implement, in conjunction with certain non-processor circuits, some, most, or all of the functions of the method and/or apparatus described herein.
- processors or “processing devices” such as microprocessors, digital signal processors, customized processors and field programmable gate arrays (FPGAs) and unique stored program instructions (including both software and firmware) that control the one or more processors to implement, in conjunction with certain non-processor circuits, some, most, or all of the functions of the method and/or apparatus described herein.
- FPGAs field programmable gate arrays
- unique stored program instructions including both software and firmware
- an embodiment can be implemented as a computer-readable storage medium having computer readable code stored thereon for programming a computer (e.g., comprising a processor) to perform a method as described and claimed herein.
- Examples of such computer-readable storage mediums include, but are not limited to, a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a ROM (Read Only Memory), a PROM (Programmable Read Only Memory), an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory) and a Flash memory.
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Abstract
Description
- This application is a continuation of U.S. patent application Ser. No. 17/017,416, filed on Sep. 10, 2020, and incorporated herein by reference in its entirety.
- Bioptic barcode readers traditionally use a camera/sensor and split the camera/sensor's field-of-view between vertical and horizontal windows, which creates a variety of challenges that must be solved through careful arrangement of the internal components. However, since the fields-of-view through the vertical and horizontal windows are intrinsically tied together to the same camera/sensor, the options of how to arrange the internal components can be limited. In typical bioptic readers that split the camera/sensor's field-of-view, the field-of-view through the horizontal window is tilted towards the tower/upper housing portion so that a portion of the field-of-view is not illuminated and cuts off a portion of the field-of-view. In addition, a substantial portion (10%) of the field-of-view through the horizontal window is typically lost because it is not illuminated without causing internal reflection issues.
- In an embodiment, the present invention is a bioptic barcode reader having a housing having a lower housing portion with an upper surface facing a product scanning region and an upper housing portion extending above the lower housing portion. A generally horizontal window is positioned at the upper surface of the lower housing portion and is configured to allow a first light to pass between the product scanning region and an interior region of the housing. A generally upright window is positioned in the upper housing portion and is configured to allow a second light to pass between the product scanning region and the interior region of the housing. An illumination assembly has an illumination field-of-view and an imaging assembly, including an image sensor, has an imaging field-of-view with a centerline that is directed at an angle relative to the upper surface. A mirror arrangement is positioned within the interior region and is configured to split the imaging field-of-view along a horizontal axis into a first portion and a second portion, redirect the first portion of the imaging field-of-view through the generally upright window, and redirect the second portion of the imaging field-of-view and the illumination field-of-view through the generally horizontal window such that the second portion of the imaging field-of-view is uniformly covered by the illumination field-of-view at the generally horizontal window.
- In another embodiment, the present invention is a bioptic barcode reader having a housing having a lower housing portion with an upper surface facing a product scanning region and an upper housing portion extending above the lower housing portion. A generally horizontal window is positioned at the upper surface of the lower housing portion and is configured to allow a first light to pass between the product scanning region and an interior region of the housing. A generally upright window is positioned in the upper housing portion and is configured to allow a second light to pass between the product scanning region and the interior region of the housing. An illumination assembly, including a light emitting diode, has an illumination field-of-view and an imaging assembly, including an image sensor, has an imaging field-of-view with a centerline that is directed at an angle relative to the upper surface. A mirror arrangement is positioned within the interior region and includes a splitter mirror, a first mirror, and a second mirror. The splitter mirror is positioned directly in a first path of a first portion of the imaging field-of-view and is configured to split the imaging field-of-view along a horizontal axis and redirect the first portion of the imaging field-of-view from the first path to a second path towards the second mirror. The first mirror is positioned directly in a third path of a second portion of the imaging field-of-view and directly in a fourth path of the illumination field-of-view and is configured to redirect the second portion of the imaging field-of-view and the illumination field-of-view through the generally horizontal window such that the second portion of the imaging field-of-view is uniformly covered by the illumination field-of-view at the generally horizontal window and a reflection of the light emitting diodes is located outside of the second portion of the imaging field-of-view in the product scanning region. The second mirror is positioned directly in the second path and is configured to redirect the first portion through the generally upright window.
- The accompanying figures, where like reference numerals refer to identical or functionally similar elements throughout the separate views, together with the detailed description below, are incorporated in and form part of the specification, and serve to further illustrate embodiments of concepts that include the claimed examples, and explain various principles and advantages of those embodiments.
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FIG. 1 illustrates a side perspective view of an example bioptic barcode reader; -
FIG. 2 illustrates a top view of the example barcode reader ofFIG. 1 ; -
FIG. 3A is a cross-sectional view of the barcode reader ofFIG. 2 taken along line A-A with a first example configuration of illumination and imaging assemblies; -
FIG. 3B is an enlarged view of a portion of the barcode reader ofFIG. 3A ; -
FIG. 4A is a cross-sectional view of the barcode reader ofFIG. 2 taken along line A-A with a second example configuration of illumination and imaging assemblies; -
FIG. 4B is an enlarged view of a portion of the barcode reader ofFIG. 4A ; -
FIG. 5A is a cross-sectional view of the barcode reader ofFIG. 2 taken along line A-A with a third example configuration of illumination and imaging assemblies; -
FIG. 5B is an enlarged view of a portion of the barcode reader ofFIG. 5A ; -
FIG. 6A is a cross-sectional view of the barcode reader ofFIG. 2 taken along line A-A with a fourth example configuration of illumination and imaging assemblies; -
FIG. 6B is an enlarged view of a portion of the barcode reader ofFIG. 6A ; -
FIG. 7A is a cross-sectional view of the barcode reader ofFIG. 2 taken along line A-A with a fifth example configuration of illumination and imaging assemblies; and -
FIG. 7B is an enlarged view of a portion of the barcode reader ofFIG. 7A . - Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the present invention.
- The apparatus and method components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the disclosed examples so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.
- The examples disclosed herein relate to bioptic barcode readers where the centerline of the field-of-view of the camera/sensor is angled from horizontal, or the plane of the upper surface of the housing, at a specific angle to address the issues encountered by typical bioptic barcode readers.
- When configuring the fields-of-view in a bioptic barcode reader, there are four main factors to consider: (1) field-of-view placement; (2) illumination uniformity; (3) internal reflection avoidance; and (4) internal path length. First, the fields-of-view through the vertical and horizontal windows should be located to maximize coverage of the windows. The field-of-view through the horizontal window should fill the window and provide good coverage from the far end of the window up to 5 inches above the upper surface and the field-of-view through the vertical window should fill the window as much as possible and also provide good coverage from the upper surface to 5 inches above the upper surface at the middle of the horizontal window. Second, the illumination system should cover each of the fields-of-view uniformly both at the horizontal and vertical windows and up to 5 inches away from the windows. Third, reflections of the illumination system (e.g., light emitting diodes) should not be visible in the field-of-view of the camera/sensor. Fourth, the internal path traveled by the fields-of-view should be such that the camera/sensor is focused near the upper surface of the horizontal window and focuses approximately 1-2 inches from the vertical window.
- In typical bioptic barcode readers, where the centerlines of the camera/sensor field-of-view and the illumination field-of-view are horizontal or parallel to the upper surface, all of these factors are not addressed. For example, in these bioptic barcode readers the illumination through the horizontal window is not uniform across the field-of-view of the camera/sensor through the horizontal window and the field-of-view of the camera/sensor through the horizontal window is clipped at the tower side of the horizontal window. While tilting the mirror that directs the field-of-view of the camera/sensor upward may allow the illumination to more uniformly cover the field-of-view of the camera/sensor at the horizontal window, doing so also moves the reflection of the illumination assembly within the field-of-view of the camera/sensor, causing internal reflection issues.
- By tilting the field-of-view of the camera/sensor as described herein, the field-of-view of the camera/sensor through the horizontal window can be tilted so that it is not clipped by the tower, so the field-of-view of the camera/sensor is uniformly illuminated, and so the reflection of the illumination assembly is not within the field-of-view of the camera/sensor. This also allows the field-of-view of the camera/sensor to be split unevenly to allow for a larger portion of the field-of-view of the camera/sensor to be directed out of the vertical window, which allows the field-of-view through the vertical window to see higher above the upper surface and cover more of the vertical window. More uniformity of illumination, larger and non-clipped fields-of-view through the horizontal and vertical windows, and avoidance of reflections of the illumination assembly within the camera/sensor field-of-view results in a much better performing bioptic barcode reader.
- Referring to
FIGS. 1 and 2 , an examplebioptic barcode reader 10 is shown that can be configured to be supported by a workstation, such as a checkout counter at a POS of a retail store, and has aproduct scanning region 150.Bioptic barcode reader 10 has ahousing 100 with alower housing portion 110 and anupper housing portion 135 that extends abovelower housing portion 110.Lower housing portion 110 has anupper surface 115 that facesproduct scanning region 150 and has aproximal end 120 proximateupper housing portion 135 and adistal end 125 that is generally parallel to and oppositeproximal end 120. A generallyhorizontal window 130 is positioned atupper surface 115 oflower housing portion 110 and is configured to allow a first light to pass betweenproduct scanning region 150 and aninterior region 105 ofhousing 100.Horizontal window 130 has a length L that extends fromproximal end 120 ofupper surface 115 towardsdistal end 125 and a width W that extends perpendicular to and is greater than length L. In the example shown, length L is approximately 4 inches and width W is approximately 4 ½ inches. A generallyupright window 140 is positioned inupper housing portion 135 and is configured to allow a second light to pass betweenproduct scanning region 150 andinterior region 105 ofhousing 100. The first and second lights intersect to defineproduct scanning region 150 ofbioptic barcode reader 10 where a product can be scanned for sale at the POS. - Referring to
FIGS. 3A and 3B ,bioptic barcode reader 10 is shown with a first example configuration of internal components. In the example shown, a printedcircuit board 200 is positioned ininterior region 105 ofhousing 100 and is oriented perpendicular (generally vertical) to upper surface 115 (generally horizontal). Anillumination assembly 205, having an illumination field-of-view 210, is mounted on printedcircuit board 200 and can include one or more light emitting diodes or any other light source appropriate for a given application. Animaging assembly 225, having an imaging field-of-view 230, has animage sensor 240 that is also mounted on printedcircuit board 200. Mountingillumination assembly 205 andimage sensor 240 ofimaging assembly 225 on the same printedcircuit board 200 minimized cost and complexity forbioptic barcode reader 10. Imaging field-of-view 230 ofimaging assembly 225 has acenterline 235 that is directed at an angle a relative toupper surface 115, which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees. In this example,imaging lens 250 ofimaging assembly 225 has acentral axis 255 that is parallel to and offset from acentral axis 245 ofimage sensor 240 to redirect the field-of-view ofimage sensor 240 to imaging field-of-view 230. - A
mirror arrangement 300 is also positioned withininterior region 105 ofhousing 100, is configured to divide imaging field-of-view 230, and includes asplitter mirror 305,first mirror 310, andsecond mirror 315.Splitter mirror 305 is positioned directly in a first path P1 offirst portion 231 of imaging field-of-view 230 and is configured to split imaging field-of-view 230, preferably along a horizontal axis, into afirst portion 231 and asecond portion 232.Splitter mirror 305 redirectsfirst portion 231 throughupright window 140 by redirectingfirst portion 231 from first path P1 to a second path P2 towardssecond mirror 315.Second mirror 315 is positioned directly in second path P2 and is configured to redirectfirst portion 231 of imaging field-of-view 230 throughupright window 140.First mirror 310 is positioned directly in a third path P3 ofsecond portion 232 of imaging field-of-view 230 and in a fourth path P4 of illumination field-of-view 210 and is configured to redirectsecond portion 232 of imaging field-of-view 230 and illumination field-of-view 210 throughhorizontal window 130, such thatsecond portion 232 of imaging field-of-view 230 is uniformly covered by illumination field-of-view 210 athorizontal window 130. As shown, splitter, first, andsecond mirrors mirror arrangement 300 can various alternative configurations. For example,first mirror 310 and/orsecond mirror 315 could be concave or convex mirrors, or multiple planar mirrors could be used, to reflect multiple fields-of-view throughhorizontal window 130 andupright window 140, respectively. In addition,splitter mirror 305 could be a concave or convex mirror, or multiple planar mirrors could be used, to divide second path P2 offirst portion 231 into multiple fields-of-view that are directed towards multiple second mirrors and throughupright window 140. - Referring to
FIGS. 4A and 4B ,bioptic barcode reader 10 is shown with a second example configuration of internal components. In the example shown, printedcircuit board 200 is positioned ininterior region 105 ofhousing 100 and is oriented perpendicular toupper surface 115.Illumination assembly 205 andimaging assembly 225 are mounted on printedcircuit board 200. Mountingillumination assembly 205 andimage sensor 240 ofimaging assembly 225 on the same printedcircuit board 200 minimized cost and complexity forbioptic barcode reader 10.Centerline 235 of imaging field-of-view 230 is directed at angle a relative toupper surface 115, which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees. In this example, to tilt imaging field-of-view 230 at angle a,image sensor 240 is mounted on printedcircuit board 200 at angle a relative to printedcircuit board 200.Mirror arrangement 300 in this example is the same as described above. - Referring to
FIGS. 5A and 5B ,bioptic barcode reader 10 is shown with a third example configuration of internal components. In the example shown, printedcircuit board 200 is positioned ininterior region 105 ofhousing 100.Illumination assembly 205 andimaging assembly 225 are mounted on printedcircuit board 200. Mountingillumination assembly 205 andimage sensor 240 ofimaging assembly 225 on the same printedcircuit board 200 minimized cost and complexity forbioptic barcode reader 10.Centerline 235 of imaging field-of-view 230 is directed at angle a relative toupper surface 115, which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees. In this example, to tilt imaging field-of-view 230 at angle a, printedcircuit board 200 is aligned at angle a relative to an axis that is perpendicular toupper surface 115.Mirror arrangement 300 in this example is the same as described above. - Referring to
FIGS. 6A and 6B ,bioptic barcode reader 10 is shown with a fourth example configuration of internal components. In the example shown, printedcircuit board 200 is positioned ininterior region 105 ofhousing 100 and is oriented perpendicular toupper surface 115.Illumination assembly 205 andimaging assembly 225 are mounted on printedcircuit board 200. Mountingillumination assembly 205 andimage sensor 240 ofimaging assembly 225 on the same printedcircuit board 200 minimized cost and complexity forbioptic barcode reader 10.Centerline 235 of imaging field-of-view 230 is directed at angle a relative toupper surface 115, which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees. In this example, to tilt imaging field-of-view 230 at angle a,imaging assembly 225 includes aprism 260 that is positioned in front ofimaging lens 250 to redirect imaging field-of-view 230 at angle a.Mirror arrangement 300 in this example is the same as described above. - Referring to
FIGS. 7A and 7B ,bioptic barcode reader 10 is shown with a fifth example configuration of internal components. In the example shown, a first printedcircuit board 200A is positioned ininterior region 105 ofhousing 100 and is aligned perpendicular toupper surface 115 and a second printedcircuit board 200B is positioned ininterior region 105 and is aligned at angle a relative to an axis perpendicular toupper surface 115.Illumination assembly 205 is mounted on first printedcircuit board 200A andimaging assembly 225 is mounted on second printedcircuit board 200B such thatcenterline 235 of imaging field-of-view 230 is directed at angle a relative toupper surface 115, which is preferably greater than or equal to 0.5 degrees and less than or equal to 5.0 degrees.Mirror arrangement 300 in this example is the same as described above. - In all of the examples shown in
FIGS. 3-7 and described above, by tilting imaging field-of-view 230 at angle a,second portion 232 of imaging field-of-view 230 that exits throughhorizontal window 130 is moved away fromupper housing portion 135 and no longer intersectsupper housing portion 135, so that more ofsecond portion 232 is available for scanning at greater distances fromupper surface 115. In addition, even though thesecond portion 232 of imaging field-of-view 230 that exits throughhorizontal window 130 is moved away fromupper housing portion 135, areflection 215 of the light emitting diode(s) or other light source of illumination assembly is still located outside ofsecond portion 232 inproduct scanning region 150, which again provides more useful scanning area insecond portion 232. - In the foregoing specification, specific embodiments have been described. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the invention as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of present teachings. Additionally, the described embodiments/examples/implementations should not be interpreted as mutually exclusive, and should instead be understood as potentially combinable if such combinations are permissive in any way. In other words, any feature disclosed in any of the aforementioned embodiments/examples/implementations may be included in any of the other aforementioned embodiments/examples/implementations. Moreover, no steps of any method disclosed herein shall be understood to have any specific order unless it is expressly stated that no other order is possible or required by the remaining steps of the respective method. Also, at least some of the figures may or may not be drawn to scale.
- The benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential features or elements of any or all the claims. The legal scope of the property right is defined solely by the appended claims including any amendments made during the pendency of this application and all equivalents of those claims as issued.
- Moreover, in this document, relational terms such as first and second, top and bottom, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” “has”, “having,” “includes”, “including,” “contains”, “containing” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, has, includes, contains a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “comprises . . . a”, “has . . . a”, “includes . . . a”, “contains . . . a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises, has, includes, contains the element. The terms “a” and “an” are defined as one or more unless explicitly stated otherwise herein. The terms “substantially”, “essentially”, “approximately”, “about” or any other version thereof, are defined as being close to as understood by one of ordinary skill in the art, and in one non-limiting embodiment the term is defined to be within 10%, in another embodiment within 5%, in another embodiment within 1% and in another embodiment within 0.5%. The term “coupled” as used herein is defined as connected, although not necessarily directly and not necessarily mechanically. A device or structure that is “configured” in a certain way is configured in at least that way, but may also be configured in ways that are not listed.
- It will be appreciated that some embodiments may be comprised of one or more generic or specialized processors (or “processing devices”) such as microprocessors, digital signal processors, customized processors and field programmable gate arrays (FPGAs) and unique stored program instructions (including both software and firmware) that control the one or more processors to implement, in conjunction with certain non-processor circuits, some, most, or all of the functions of the method and/or apparatus described herein. Alternatively, some or all functions could be implemented by a state machine that has no stored program instructions, or in one or more application specific integrated circuits (ASICs), in which each function or some combinations of certain of the functions are implemented as custom logic. Of course, a combination of the two approaches could be used.
- Moreover, an embodiment can be implemented as a computer-readable storage medium having computer readable code stored thereon for programming a computer (e.g., comprising a processor) to perform a method as described and claimed herein. Examples of such computer-readable storage mediums include, but are not limited to, a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a ROM (Read Only Memory), a PROM (Programmable Read Only Memory), an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory) and a Flash memory. Further, it is expected that one of ordinary skill, notwithstanding possibly significant effort and many design choices motivated by, for example, available time, current technology, and economic considerations, when guided by the concepts and principles disclosed herein will be readily capable of generating such software instructions and programs and ICs with minimal experimentation.
- The patent claims at the end of this patent application are not intended to be construed under 35 U.S.C. § 112(f) unless traditional means-plus-function language is expressly recited, such as “means for” or “step for” language being explicitly recited in the claim(s).
- The Abstract is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, it can be seen that various features are grouped together in various embodiments for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separately claimed subject matter.
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US20190188434A1 (en) * | 2017-12-18 | 2019-06-20 | Symbol Technologies, Llc | Bi-optic barcode reader |
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US20080283603A1 (en) * | 2007-05-14 | 2008-11-20 | Peter Barron | Barcode scanner operator interface |
US20130181051A1 (en) * | 2012-01-13 | 2013-07-18 | Bryan L. Olmstead | Two-plane optical code reader for acquisition of multiple views of an object |
US9018545B2 (en) * | 2012-09-28 | 2015-04-28 | Symbol Technologies, Inc. | Arrangement for and method of preventing overhanging weighing platter of scale from tipping at product checkout system and method of mounting and removing the weighing platter without tools |
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US20100102129A1 (en) * | 2008-10-29 | 2010-04-29 | Symbol Technologies, Inc. | Bar code reader with split field of view |
US20190188434A1 (en) * | 2017-12-18 | 2019-06-20 | Symbol Technologies, Llc | Bi-optic barcode reader |
US11210481B1 (en) * | 2020-09-10 | 2021-12-28 | Zebra Technologies Corporation | Bioptic barcode reader |
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