WO2004057521B1 - Optical code reader having variable depth of field - Google Patents

Optical code reader having variable depth of field

Info

Publication number
WO2004057521B1
WO2004057521B1 PCT/US2003/040459 US0340459W WO2004057521B1 WO 2004057521 B1 WO2004057521 B1 WO 2004057521B1 US 0340459 W US0340459 W US 0340459W WO 2004057521 B1 WO2004057521 B1 WO 2004057521B1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
image
field
optical element
assembly
Prior art date
Application number
PCT/US2003/040459
Other languages
French (fr)
Other versions
WO2004057521A2 (en
WO2004057521A3 (en
Inventor
Paul Dvorkis
Alex Breytman
Mark Krichever
Brad Carlson
Tsi David Shi
Original Assignee
Symbol Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Symbol Technologies Inc filed Critical Symbol Technologies Inc
Priority to CA002508602A priority Critical patent/CA2508602C/en
Priority to AT03797063T priority patent/ATE456104T1/en
Priority to DE60331105T priority patent/DE60331105D1/en
Priority to EP03797063A priority patent/EP1584061B1/en
Priority to AU2003297990A priority patent/AU2003297990B2/en
Publication of WO2004057521A2 publication Critical patent/WO2004057521A2/en
Publication of WO2004057521A3 publication Critical patent/WO2004057521A3/en
Publication of WO2004057521B1 publication Critical patent/WO2004057521B1/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/14—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by 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
    • G06K7/0004—Hybrid readers
    • 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
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • 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
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G06K7/10376—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable
    • G06K7/10386—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable the interrogation device being of the portable or hand-handheld type, e.g. incorporated in ubiquitous hand-held devices such as PDA or mobile phone, or in the form of a portable dedicated RFID reader
    • 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
    • G06K7/10792—Special measures in relation to the object to be scanned
    • G06K7/10801—Multidistance reading
    • G06K7/10811—Focalisation

Abstract

Several optical systems for imaging engines of imaging optical code readers are disclosed. Each optical system includes the abilities to change the depth of field of the imaging field and to adjust a focus quality of the imaging field. The disclosed structures for changing the depth of field of the disclosed optical systems allow for the automatic or manual selection of one of a plurality of depths of field.

Claims

AMENDED CLAIMS[received by the International Bureau on 02 August 2004 (02.08.04); Original claims 1-26 replaced by new claims 1-25 (8 pages).]
1. An optical system for an optical code reader including an image sensor, the optical system comprising: an optical assembly including at least one optical element located in an optical path of the code reader for impinging an image of an optical code onto the image sensor; an image focusing assembly in operative communication with the at least one optical element and the image sensor for adjusting the position and/or orientation of the at least one optical element and/or the image sensor for adjusting a focus quality of the image; and an image modification assembly having an image modification device selectively moveable among a plurality of positions, wherein each position modifies the depth of field of said image impinged onto the image sensor and wherein said image modification device is transversely or rotationally moveable with respect to the optical path.
2. The optical system of claim 1, wherein the image modification device is an optical wedge having a first thickness corresponding to a first depth of field and a second thickness corresponding to a second depth of field.
3. The optical system of claim 1, wherein the image modification device is an optical wedge having a plurality of thicknesses each corresponding to a particular depth of field.
29
4. The optical system of claim 1, wherein the image modification assembly comprises a manually actuated trigger assembly operatively coupled to the image modification device for moving the image modification device to one of the plurality of positions while substantially simultaneously imaging the optical code.
5. The optical system of claim 1, wherein the image modification assembly further comprises a switch for selectively switching the image modification device among
the plurality of positions.
6. The optical system of claim 1, wherein the image focusing assembly is in operative communication with an actuator capable of controlling the position of the image modification device for adjusting the depth of field and focus quality of the image.
7. The optical system of claim 1 , wherein the image focusing assembly is capable of moving at least one of the at least one optical element and the image sensor along an optical beam path for adjusting the focus quality of the image.
8. The optical system of claim 1, further comprising a processing unit for generating and transmitting an output signal to at least one of the image modification device and the image focusing assembly for automatically controlling at least one parameter of the optical system.
30
9. An optical system for an optical code reader including an image sensor
comprising: an optical assembly including an optical element located in an optical path of the code reader for impinging an image of an optical code onto the image sensor; an image modification assembly including an optical wedge having a first thickness defining a near depth of field and a second thickness defining a far depth of field, said optical wedge being selectively moveable between the first and second positions such that a portion of said optical wedge is positioned substantially perpendicular to an optical path for modifying the depth of field of said image impinged onto the image sensor, said optical path being unobstructed from said optical wedge to said image sensor when said portion of said optical wedge is positioned substantially perpendicular to said optical path; and an image focusing assembly for moving the optical element and the image sensor
for adjusting a focus quality of the image onto the image sensor.
10. The optical system of claim 9, wherein the image focusing assembly controls the image modification assembly for controlling the depth of field.
11. The optical system of claim 9, wherein the image focusing assembly controls the position and/or orientation of the image sensor for controlling the focus quality of the image.
12. An optical system for an optical code reader including an image sensor comprising: an optical assembly including an optical element located in an optical path of the code reader for impinging an image of an optical code onto the image sensor; an image modification assembly including an adjustable aperture assembly having a first diameter defining a near depth of field and a second diameter defining a far depth of field, said aperture assembly being selectively moveable between the first and second positions for modifying the depth of field of said image impinged onto the image sensor, wherein a point of an aperture defined by said adjustable aperture assembly is aligned with a substantially straight optical path, and wherein one endpoint of said substantially straight optical path intercepts the image sensor; and an image focusing assembly for moving the optical element and the image sensor for adjusting a focus quality of the image onto the image sensor.
13. The optical system of claim 12, wherein the image focusing assembly controls the image modification assembly for controlling the depth of field.
14. The optical system of claim 12, wherein the image focusing assembly controls the position and/or orientation of the image sensor for controlling the focus quality of the image.
32
15. An optical system for an optical code reader comprising: first and second lens assemblies having respective first and second depths of field, and respective first and second input optical axes; at least one optical element having a transmissive state and a reflective state positioned in at least the first input optical axis to provide incident light from the first lens assembly to an image sensor when the at least one optical element is in the transmissive state and to provide incident light from the second lens assembly to the image sensor when the at least one optical element is in the reflective state; and a control circuit assembly for applying a voltage to the at least one optical element for switching the at least one optical element between the transmissive and reflective states to switch between the first and second depths of field.
16. An optical code reading system comprising: a photo sensor employing an array of cells for producing electrical signals responsive to an image directed to said sensor; an optical system for focusing one of at least two images corresponding to at least two depths of field which do not completely overlap to the photo sensor, the optical system including at least one moveable optical element capable of being transversely or rotationally moveable with respect to an optical path and being positioned substantially perpendicular to the optical path for switching between said depths of field, said optical element having at least two different thicknesses corresponding to the at least two depths of field, said optical path being unobstructed from said moveable optical element to said
33 image sensor when said moveable optical element is positioned substantially perpendicular to said optical path; means for controlling said optical element to switch between the depths of field; and means for decoding data from the electrical signals corresponding to an optical code contained in at least one of the images focused on the photo sensor.
17. The optical code reading system of Claim 16, wherein the optical system includes at least one lens through which an input optical path of the system passes and wherein the at least two thicknesses of the moveable optical element traverse the optical path for switching between said fields of view.
18. An imaging system for reading an optical code comprising: a photo sensor employing an array of cells for producing electrical signals
responsive to an image directed to said sensor; an optical system for directing images to the photo sensor, wherein the optical system includes an optical element for switching between at least two states to vary the optical properties of the image directed to the photo sensor, wherein the optical element is an optical wedge having at least two different thicknesses corresponding to the at least two states, said optical element capable of being transversely or rotationally moveable with respect to an optical path and being positioned substantially perpendicular to the optical path, said optical path being unobstructed from said optical element to said image
34 sensor when said optical element is positioned substantially perpendicular to said optical
path; and means for controlling the optical wedge to select an image of the optical code that is readily decodable.
19. The imaging system of Claim 18, wherein the optical element is switched
between the at least two states to provide at least two different depths of field.
20. The imaging system of Claim 18, wherein the optical element is switched between the at least two states to provide at least two different focal distances.
21. The imaging system of Claim 18, further comprising automatic focusing means for controlling at least one of the optical system and the photo sensor for focusing the image.
22. The imaging system of Claim 18, wherein the at least two different thicknesses have a difference of approximately 0.7mm.
23. An imaging system for reading an optical code comprising: a photo sensor employing an array of cells for producing electrical signals responsive to an image directed to said sensor; an optical system for directing images to the photo sensor, wherein the optical system includes at least one electrically operative optical element for electronically
35 switching between at least two states to vary the optical properties of the image directed to the photo sensor, wherein the at least one optical element is at least one electronic mirror; and means for controlling the at least one electronic mirror to select an image of the optical code that is readily decodable.
24. The imaging system of Claim 23, wherein the at least one optical element is switched between the at least two states to provide different depths of field.
25. The imaging system of Claim 23, wherein the at least one optical element is switched between the at least two states to provide different focal distances.
36
PCT/US2003/040459 2002-12-18 2003-12-17 Optical code reader having variable depth of field WO2004057521A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002508602A CA2508602C (en) 2002-12-18 2003-12-17 Optical code reader having variable depth of field
AT03797063T ATE456104T1 (en) 2002-12-18 2003-12-17 OPTICAL CODE READER WITH VARIABLE DEPTH OF FOCUS
DE60331105T DE60331105D1 (en) 2002-12-18 2003-12-17 OPTICAL CODELESER WITH VARIABLE DEEP SHARP
EP03797063A EP1584061B1 (en) 2002-12-18 2003-12-17 Optical code reader having variable depth of field
AU2003297990A AU2003297990B2 (en) 2002-12-18 2003-12-17 Optical code reader having variable depth of field

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US43451902P 2002-12-18 2002-12-18
US60/434,519 2002-12-18
US10/405,812 US7025271B2 (en) 2002-12-18 2003-04-02 Imaging optical code reader having selectable depths of field
US10/405,812 2003-04-02

Publications (3)

Publication Number Publication Date
WO2004057521A2 WO2004057521A2 (en) 2004-07-08
WO2004057521A3 WO2004057521A3 (en) 2004-09-30
WO2004057521B1 true WO2004057521B1 (en) 2004-12-16

Family

ID=32599816

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/040459 WO2004057521A2 (en) 2002-12-18 2003-12-17 Optical code reader having variable depth of field

Country Status (7)

Country Link
US (1) US7025271B2 (en)
EP (1) EP1584061B1 (en)
AT (1) ATE456104T1 (en)
AU (1) AU2003297990B2 (en)
CA (1) CA2508602C (en)
DE (1) DE60331105D1 (en)
WO (1) WO2004057521A2 (en)

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Also Published As

Publication number Publication date
ATE456104T1 (en) 2010-02-15
EP1584061B1 (en) 2010-01-20
WO2004057521A2 (en) 2004-07-08
AU2003297990A1 (en) 2004-07-14
AU2003297990B2 (en) 2010-07-01
EP1584061A2 (en) 2005-10-12
US20040118918A1 (en) 2004-06-24
CA2508602C (en) 2008-09-30
DE60331105D1 (en) 2010-03-11
CA2508602A1 (en) 2004-07-08
US7025271B2 (en) 2006-04-11
WO2004057521A3 (en) 2004-09-30

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