CA2406616A1 - Scanner utilizing light pipe with diffuser - Google Patents
Scanner utilizing light pipe with diffuser Download PDFInfo
- Publication number
- CA2406616A1 CA2406616A1 CA002406616A CA2406616A CA2406616A1 CA 2406616 A1 CA2406616 A1 CA 2406616A1 CA 002406616 A CA002406616 A CA 002406616A CA 2406616 A CA2406616 A CA 2406616A CA 2406616 A1 CA2406616 A1 CA 2406616A1
- Authority
- CA
- Canada
- Prior art keywords
- light
- light source
- diffuser
- waveguide
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- G06K7/10742—Photodetector array or CCD scanning including a diffuser for diffusing the light from the light source to create substantially uniform illumination of the target record carrier
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Toxicology (AREA)
- General Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Planar Illumination Modules (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Credit Cards Or The Like (AREA)
- Holo Graphy (AREA)
Abstract
A scanner that can include a light source (3810) emitting light through a light pipe (3820) to a detector array. The light pipe can include a reflecti ve surface (3822) and a diffuser (3824). The reflective surface can reflect lig ht (3815), directly or indirectly towards the diffuser and the diffuser can diffuse the light out of the light pipe. The light pipe can further include a reflective groove that reflects ligth from the reflective surface towards th e diffuser. The diffuser can diffuse the light to an object that reflects the light to the detector array. The object may be a bar code, paper money, or a ny other object that can be scanned. The diffuser may be a variable diffuser.</ SDOAB>
Claims (42)
1. A device for scanning light comprising:
a light source emitting light;
a light pipe located in a path of light emitted from the light source, the light pipe including a reflective surface and a diffuser, the reflective surface reflecting the light towards the diffuser and the diffuser diffusing the light out of the light pipe; and a detector array receiving light emitted from the light source.
a light source emitting light;
a light pipe located in a path of light emitted from the light source, the light pipe including a reflective surface and a diffuser, the reflective surface reflecting the light towards the diffuser and the diffuser diffusing the light out of the light pipe; and a detector array receiving light emitted from the light source.
2. The device for scanning light according to claim 1, wherein the light pipe further includes a reflective groove, wherein the reflective surface reflects light towards the diffuser via the reflective groove and the reflective groove reflects the light towards the diffuser.
3. The device for scanning light according to claim 1, further comprising an object, wherein the object reflects light from the diffuser towards the detector array.
4. The device for scanning light according to claim 3, wherein the object comprises at least one of a bar code, a document, a credit card, a check, a travelers check, a machine vision object and currency.
5. The device for scanning light according to claim 3, further comprising a focusing lens, wherein the focusing lens focuses the light reflected from the object towards the detector array.
6. The device for scanning light according to claim 2, wherein the light source comprises a surface mount light emitting diode.
7. The device for scanning light according to claim 1, wherein the diffuser comprises at least one of a variable diffuser and a non-lambertian diffuser in combination with prismatic structures.
8. A device for diffusing light comprising:
a holographic medium; and a diffusion pattern that gradually varies in diffusion angle across the holographic medium.
a holographic medium; and a diffusion pattern that gradually varies in diffusion angle across the holographic medium.
9. The device for diffusing light according to claim 8, wherein the angle is at least one of 45° and 135°.
10. The device for diffusing light according to claim 8, wherein the diffusion pattern can comprise a plurality of diffusion patterns with different diffusion angles, the plurality of diffusion patterns overlapping each other to create the gradually varying diffusion pattern across the holographic medium.
11. The device for diffusing light according to claim 10, wherein the plurality of diffusion patterns overlap each other by about 10 percent of the area of each diffusion pattern.
12. The device for diffusing light according to claim 10, wherein the diffusion pattern varies asymmetrically across an axis of the holographic medium.
13. The device for diffusing light according to claim 10, wherein the diffusion pattern varies linearly across an axis of the holographic medium.
14. The device for diffusing light according to claim 10, further comprising at least one of an elevator floor number display, a roadside sign, an airport departure sign, a store sign, an exit sign, architectural lighting, a gas station sign, an automotive display, a cockpit display, a medical sensor, sensor illumination, a source for a sensor in machine vision, a global positioning system unit, bank terminal, machine vision, a toy and an industrial application that contains the holographic medium.
15. A system for manufacturing a variable diffuser master comprising:
a light source projecting light;
a mask in the path of the light projected from the light source; and an opening in the mask, the opening being variable in size and the opening passing the light through the mask.
a light source projecting light;
a mask in the path of the light projected from the light source; and an opening in the mask, the opening being variable in size and the opening passing the light through the mask.
16. The system for manufacturing a variable diffuser master according to claim 15, further comprising a plate wherein the opening in the mask passes light through the mask to the plate.
17. The device for manufacturing a variable diffuser master according to claim 16, wherein the light source sequentially projects light through the opening in the mask onto overlapping portions of the plate.
18. The device for manufacturing a variable diffuser master according to claim 16, wherein the light source sequentially projects light through the opening in the mask onto overlapping portions of the plate along an axis.
19. The device for manufacturing a variable diffuser master according to claim 16, further comprising a cylindrical lens in the path of the light projected from the light source
20. The device for manufacturing a variable diffuser master according to claim 16, further comprising a blocker located on the opposite side of the mask from the light source, the blocker also being located in the path of the light projected from the light source and the blocker blocking some of the light projected from the light source.
21. The device for manufacturing a variable diffuser master according to claim 17, further comprising:
a first shield located in the path of the light projected from the light source; and an opening in the first shield, the opening in the first shield allowing some of the light projected from the light source to pass through the opening.
a first shield located in the path of the light projected from the light source; and an opening in the first shield, the opening in the first shield allowing some of the light projected from the light source to pass through the opening.
22. The device for manufacturing a variable diffuser master according to claim 21, further comprising:
a second shield located on the opposite side of the mask from the light source, the second shield also being located in the path of the light projected from the light source; and an opening in the second shield, the opening in the second shield allowing some of the light projected from the light source to pass through the opening.
a second shield located on the opposite side of the mask from the light source, the second shield also being located in the path of the light projected from the light source; and an opening in the second shield, the opening in the second shield allowing some of the light projected from the light source to pass through the opening.
23. The device for manufacturing a variable diffuser master according to claim 21, wherein the second shield is located a distance from at least one of the mask and the light source, and the distance changes with each of the overlapping portions of the plate.
24. The device for manufacturing a variable diffuser master according to claim 17, wherein the mask and the opening of the second shield change in size with each of the overlapping portions of the plate.
25. A method of manufacturing a variable diffuser master comprising:
placing a plate in front of a light source; and sequentially emitting light from a light source onto overlapping portions of the plate.
placing a plate in front of a light source; and sequentially emitting light from a light source onto overlapping portions of the plate.
26. The method of manufacturing a variable diffuser master according to claim 25, further comprising:
placing a mask with an opening in the mask in between the plate and the light source; and varying the size of the opening in the mask with each sequential emission of light.
placing a mask with an opening in the mask in between the plate and the light source; and varying the size of the opening in the mask with each sequential emission of light.
27. The method of manufacturing a variable diffuser master according to claim 26, further comprising:
placing a blocker in between the mask and the plate; and varying the size of the blocker with at least one of the sequential emissions of light.
placing a blocker in between the mask and the plate; and varying the size of the blocker with at least one of the sequential emissions of light.
28. The method of manufacturing a variable diffuser master according to claim 27, further comprising:
placing an shield with an opening in the shield in between the blocker and the plate; and varying a size of the opening in the shield with each sequential emission of light.
placing an shield with an opening in the shield in between the blocker and the plate; and varying a size of the opening in the shield with each sequential emission of light.
29. The method of manufacturing a variable diffuser master according to claim 26, further comprising varying a distance of the plate from the light source with each sequential emission of light.
30. A device for sensing light comprising:
a waveguide;
a light source located on one side of the waveguide, the light source emitting light through the waveguide;
means for collimating the light; and a light detector detecting light provided by the light source through the waveguide.
a waveguide;
a light source located on one side of the waveguide, the light source emitting light through the waveguide;
means for collimating the light; and a light detector detecting light provided by the light source through the waveguide.
31. The device for sensing light according to claim 30, wherein the means for collimating light comprises a collimating lens located in between the light source and the waveguide, the collimating lens collimating light provided from the light source through the waveguide, the waveguide preserving the collimation of the light as the light passes through the waveguide.
32. The device for sensing light according to claim 31, further comprising a printed circuit board, the light source and the light detector both being located on the printed circuit board.
33. The device for sensing light according to claim 30, further comprising an encoder, the encoder being located in between the detector and the waveguide.
34. The device for sensing light according to claim 33, wherein the encoder comprises an encoder disk.
35. The device for sensing light according to claim 30, wherein the waveguide has a first metalized end, a second metalized end and a side containing facets, the first metalized end located at an opposite end of the waveguide from the second metalized end.
36. The device for sensing light according to claim 35, wherein the first metalized end and the second metalized end are at an angle in the range of 30 to 50 degrees from the side containing facets.
37. The device for sensing light according to claim 30, wherein the light detector is located adjacent to the same side of the waveguide as the light source.
38. The device for sensing light according to claim 30, wherein the means for collimating light comprises a variable diffuser.
39. A device for sensing light comprising:
a waveguide;
a light source located adjacent to one side of the light pipe, the light source emitting light to the waveguide;
an encoder;
a light detector, the light detector detecting light provided by the light source through the waveguide and the encoder.
a waveguide;
a light source located adjacent to one side of the light pipe, the light source emitting light to the waveguide;
an encoder;
a light detector, the light detector detecting light provided by the light source through the waveguide and the encoder.
40. A device for distributing light, comprising:
light pipe; and a variable diffuser located on the light pipe.
light pipe; and a variable diffuser located on the light pipe.
41. A device for scanning light comprising:
a light source emitting light;
a waveguide located in a path of light emitted from the light source, the waveguide including a reflective surface and a diffuser, the reflective surface reflecting the light towards the diffuser and the diffuser diffusing the light out of the waveguide;
and a detector array receiving light emitted from the light source through the waveguide.
a light source emitting light;
a waveguide located in a path of light emitted from the light source, the waveguide including a reflective surface and a diffuser, the reflective surface reflecting the light towards the diffuser and the diffuser diffusing the light out of the waveguide;
and a detector array receiving light emitted from the light source through the waveguide.
42. The device for scanning light according to claim 3, wherein the object comprises at least one system of a set of systems including a bar code, a document, a credit card, a check, a travelers check, a machine vision object and currency so as to minimize the at least one system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2708355A CA2708355C (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US51724000A | 2000-03-02 | 2000-03-02 | |
| US09/517,240 | 2000-03-02 | ||
| PCT/US2001/006399 WO2001065469A1 (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2708355A Division CA2708355C (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2406616A1 true CA2406616A1 (en) | 2001-09-07 |
| CA2406616C CA2406616C (en) | 2010-09-28 |
Family
ID=24058972
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2708355A Expired - Fee Related CA2708355C (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
| CA2406616A Expired - Fee Related CA2406616C (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2708355A Expired - Fee Related CA2708355C (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1266342A4 (en) |
| JP (1) | JP2003525472A (en) |
| KR (1) | KR100933386B1 (en) |
| CN (1) | CN1327383C (en) |
| AU (1) | AU2001238715A1 (en) |
| CA (2) | CA2708355C (en) |
| TW (1) | TW501359B (en) |
| WO (1) | WO2001065469A1 (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328610C (en) | 2001-08-06 | 2007-07-25 | Mei公司 | Document validator subassembly |
| US7874487B2 (en) * | 2005-10-24 | 2011-01-25 | Cognex Technology And Investment Corporation | Integrated illumination assembly for symbology reader |
| US7604174B2 (en) | 2003-10-24 | 2009-10-20 | Cognex Technology And Investment Corporation | Method and apparatus for providing omnidirectional lighting in a scanning device |
| US9070031B2 (en) | 2003-10-24 | 2015-06-30 | Cognex Technology And Investment Llc | Integrated illumination assembly for symbology reader |
| US7823783B2 (en) | 2003-10-24 | 2010-11-02 | Cognex Technology And Investment Corporation | Light pipe illumination system and method |
| US7823789B2 (en) | 2004-12-21 | 2010-11-02 | Cognex Technology And Investment Corporation | Low profile illumination for direct part mark readers |
| US9536124B1 (en) | 2003-10-24 | 2017-01-03 | Cognex Corporation | Integrated illumination assembly for symbology reader |
| US7163149B2 (en) | 2004-03-02 | 2007-01-16 | Symbol Technologies, Inc. | System and method for illuminating and reading optical codes imprinted or displayed on reflective surfaces |
| WO2005086071A2 (en) * | 2004-03-02 | 2005-09-15 | Symbol Technologies, Inc. | System and method for reading optical codes imprinted on or displayed on reflective surfaces |
| US9292724B1 (en) | 2004-12-16 | 2016-03-22 | Cognex Corporation | Hand held symbology reader illumination diffuser with aimer optics |
| US7617984B2 (en) | 2004-12-16 | 2009-11-17 | Cognex Technology And Investment Corporation | Hand held symbology reader illumination diffuser |
| KR20060129117A (en) | 2005-06-10 | 2006-12-15 | 삼성전자주식회사 | Apparatus for controlling in microwave oven using a bar-code and method the same |
| WO2011033013A1 (en) * | 2009-09-17 | 2011-03-24 | Roche Diagnostics Gmbh | High-density barcodes for medical consumables |
| US8450708B2 (en) | 2010-06-02 | 2013-05-28 | Symbol Technologies, Inc. | Arrangement for and method of generating uniform distributed illumination pattern for imaging reader |
| CN101893759B (en) * | 2010-07-14 | 2012-07-11 | 世大光电(深圳)有限公司 | Optics monitoring system and electronic device comprising same |
| CN102122000A (en) * | 2010-12-16 | 2011-07-13 | 山东新北洋信息技术股份有限公司 | Slice-like medium detector and slice-like medium processor |
| CN102865999B (en) * | 2011-07-08 | 2015-03-04 | 中国科学院微电子研究所 | LED optical characteristic detection method and detection device |
| US8876006B2 (en) | 2012-10-25 | 2014-11-04 | Symbol Technologies, Inc. | Compact imaging module with adjustable aiming pattern and arrangement for and method of spatially adjusting the aiming pattern |
| CN103279729B (en) * | 2013-05-21 | 2016-01-20 | 苏州斯普锐智能系统有限公司 | A kind of barcode scanner with shading part |
| CN105022979B (en) * | 2015-07-27 | 2018-01-16 | 深圳市民德电子科技股份有限公司 | Imaging system and the image recognition device that light-supplementing system optical axis is in that angle is set |
| US10502618B2 (en) | 2016-12-03 | 2019-12-10 | Waymo Llc | Waveguide diffuser for light detection using an aperture |
| US11003875B2 (en) * | 2018-11-01 | 2021-05-11 | Cognex Corporation | Handheld ID-reading system with integrated illumination assembly |
| US11120236B1 (en) * | 2020-02-27 | 2021-09-14 | Zebra Technologies Corporation | Optical arrangement in machine vision system with diffusive and direct illumination for DPM indicia |
| US12060991B1 (en) | 2023-11-17 | 2024-08-13 | Brady Worldwide, Inc. | Light pipe with uniform and segmented light outputs for barcode-reading devices |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58168076A (en) * | 1982-03-30 | 1983-10-04 | Fujitsu Ltd | Formation of phase type hologram |
| CA1268969A (en) * | 1986-01-15 | 1990-05-15 | Sanford Cobb, Jr. | Totally internally reflecting light conduit |
| US4787688A (en) * | 1987-09-28 | 1988-11-29 | Eastman Kodak Company | Hologon and method of manufacturing a hologon |
| EP0479490A3 (en) | 1990-10-02 | 1992-08-12 | Physical Optics Corporation | Volume holographic diffuser |
| US5756981A (en) * | 1992-02-27 | 1998-05-26 | Symbol Technologies, Inc. | Optical scanner for reading and decoding one- and-two-dimensional symbologies at variable depths of field including memory efficient high speed image processing means and high accuracy image analysis means |
| US5586212A (en) * | 1994-07-06 | 1996-12-17 | Hewlett-Packard | Optical wave guide for hand-held scanner |
| US5770847A (en) | 1994-12-23 | 1998-06-23 | Spectra-Physics Scanning Systems, Inc. | Bar code reader with multi-focus lens |
| US5838403A (en) * | 1996-02-14 | 1998-11-17 | Physical Optics Corporation | Liquid crystal display system with internally reflecting waveguide for backlighting and non-Lambertian diffusing |
| US5956080A (en) * | 1996-04-25 | 1999-09-21 | Sanyo Electric Co., Ltd. | Printing face inspecting apparatus |
| JPH10190956A (en) * | 1996-12-24 | 1998-07-21 | Rohm Co Ltd | Linear light source device, light transmission member used therefor, and image reader provided with linear light source employing the light transmission member |
| GB9724781D0 (en) * | 1997-11-24 | 1998-01-21 | Ncr Int Inc | Visual displays |
| JPH11242120A (en) * | 1998-02-25 | 1999-09-07 | Sharp Corp | Element hologram panel and reproduced image generator using the panel |
| JP2000261865A (en) * | 1999-03-04 | 2000-09-22 | Koito Ind Ltd | Remote controller of washing device |
| JP2001033851A (en) * | 1999-07-21 | 2001-02-09 | Olympus Optical Co Ltd | Stroboscopic device |
-
2001
- 2001-02-27 EP EP01911199A patent/EP1266342A4/en not_active Withdrawn
- 2001-02-27 TW TW090104563A patent/TW501359B/en not_active IP Right Cessation
- 2001-02-27 AU AU2001238715A patent/AU2001238715A1/en not_active Abandoned
- 2001-02-27 KR KR1020027011464A patent/KR100933386B1/en not_active IP Right Cessation
- 2001-02-27 JP JP2001564088A patent/JP2003525472A/en active Pending
- 2001-02-27 CA CA2708355A patent/CA2708355C/en not_active Expired - Fee Related
- 2001-02-27 CN CNB01808527XA patent/CN1327383C/en not_active Expired - Fee Related
- 2001-02-27 CA CA2406616A patent/CA2406616C/en not_active Expired - Fee Related
- 2001-02-27 WO PCT/US2001/006399 patent/WO2001065469A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1327383C (en) | 2007-07-18 |
| EP1266342A1 (en) | 2002-12-18 |
| AU2001238715A1 (en) | 2001-09-12 |
| KR100933386B1 (en) | 2009-12-22 |
| CA2708355C (en) | 2012-05-29 |
| EP1266342A4 (en) | 2005-03-30 |
| CA2406616C (en) | 2010-09-28 |
| KR20020081382A (en) | 2002-10-26 |
| TW501359B (en) | 2002-09-01 |
| CA2708355A1 (en) | 2001-09-07 |
| WO2001065469A1 (en) | 2001-09-07 |
| CN1426570A (en) | 2003-06-25 |
| JP2003525472A (en) | 2003-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20150227 |