WO2005041556A3 - Light pipe illumination system and method - Google Patents

Light pipe illumination system and method Download PDF

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Publication number
WO2005041556A3
WO2005041556A3 PCT/US2004/034389 US2004034389W WO2005041556A3 WO 2005041556 A3 WO2005041556 A3 WO 2005041556A3 US 2004034389 W US2004034389 W US 2004034389W WO 2005041556 A3 WO2005041556 A3 WO 2005041556A3
Authority
WO
WIPO (PCT)
Prior art keywords
field
illumination
light pipe
light
camera
Prior art date
Application number
PCT/US2004/034389
Other languages
French (fr)
Other versions
WO2005041556A2 (en
Inventor
Carl W Gerts Iii
William H Equitz
Justin Testa
Sateesh Nadabar
Original Assignee
Cognex Tech & Investment Corp
Carl W Gerts Iii
William H Equitz
Justin Testa
Sateesh Nadabar
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 Cognex Tech & Investment Corp, Carl W Gerts Iii, William H Equitz, Justin Testa, Sateesh Nadabar filed Critical Cognex Tech & Investment Corp
Publication of WO2005041556A2 publication Critical patent/WO2005041556A2/en
Publication of WO2005041556A3 publication Critical patent/WO2005041556A3/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • 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
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • 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
    • G06K2007/10485—Arrangement of optical elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2207/00—Other aspects
    • G06K2207/1011—Aiming

Abstract

A system and method is provided for illuminating a subject using a light pipe that transmits light from a source, such as an LED ring illuminator to an outlet that directs the light appropriately as either bright field illumination, dark field illumination or both. The light pipe can include concentric cylinders, typically with a bright field illu­minator nested within a dark field illuminator. The tip of the dark field illuminator may be angled so as to internally reflect light inwardly toward the central optical axis of a camera at a low angle. The tip can be located near the focal plane of the camera for the desired field of view. The field of view of the camera sensor can be modified to reject data outside of a illumination field of a particular shape. This illumination field can be created by shaping the light pipe in a predetermined form that projects the modified illumination field. Likewise, a set of aiming illuminators (in, for example, a noticeable color) can be provided around the perimeter of the light pipe to delineate outer boundaries of the illumination field or area of interest. These approaches facilitate better aiming of the sensor into the desired area of interest so that it is illuminated and/or acquired most-fully.
PCT/US2004/034389 2003-10-24 2004-10-18 Light pipe illumination system and method WO2005041556A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/693,626 US7823783B2 (en) 2003-10-24 2003-10-24 Light pipe illumination system and method
US10/693,626 2003-10-24

Publications (2)

Publication Number Publication Date
WO2005041556A2 WO2005041556A2 (en) 2005-05-06
WO2005041556A3 true WO2005041556A3 (en) 2005-06-30

Family

ID=34522441

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/034389 WO2005041556A2 (en) 2003-10-24 2004-10-18 Light pipe illumination system and method

Country Status (2)

Country Link
US (5) US7823783B2 (en)
WO (1) WO2005041556A2 (en)

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US8770483B2 (en) 2014-07-08
US20050087601A1 (en) 2005-04-28
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US20120118967A1 (en) 2012-05-17
US20110024504A1 (en) 2011-02-03

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