WO2004092926A3 - Light wedge for illuminating a platen in a print scanner - Google Patents

Light wedge for illuminating a platen in a print scanner Download PDF

Info

Publication number
WO2004092926A3
WO2004092926A3 PCT/US2004/009707 US2004009707W WO2004092926A3 WO 2004092926 A3 WO2004092926 A3 WO 2004092926A3 US 2004009707 W US2004009707 W US 2004009707W WO 2004092926 A3 WO2004092926 A3 WO 2004092926A3
Authority
WO
WIPO (PCT)
Prior art keywords
light
platen
wedge
illumination
illuminating
Prior art date
Application number
PCT/US2004/009707
Other languages
French (fr)
Other versions
WO2004092926A2 (en
Inventor
George W Mcclurg
Dean J Fedele
Original Assignee
Cross Match Technologies Inc
George W Mcclurg
Dean J Fedele
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 Cross Match Technologies Inc, George W Mcclurg, Dean J Fedele filed Critical Cross Match Technologies Inc
Publication of WO2004092926A2 publication Critical patent/WO2004092926A2/en
Publication of WO2004092926A3 publication Critical patent/WO2004092926A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings

Abstract

Light wedges that reflect light internally and produce diffuse light for uniformly illuminating a platen in a print scanner are presented. In one example, a light wedge has a first surface that receives light emitted from an illumination source and a second surface that limits specular reflections. The light wedge transmits light from the illumination source toward the platen, whereby uniform illumination is provided to the platen. In another example, a light wedge has an illumination surface that receives light emitted from the illumination source, a first surface that limits specular reflections, and a second surface that acts as a diffuser. The second surface reflects light out of the light wedge toward the platen, whereby uniform illumination is provided to the platen.
PCT/US2004/009707 2003-04-09 2004-03-31 Light wedge for illuminating a platen in a print scanner WO2004092926A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/409,156 2003-04-09
US10/409,156 US6867850B2 (en) 2002-01-17 2003-04-09 Light wedge for illuminating a platen in a print scanner

Publications (2)

Publication Number Publication Date
WO2004092926A2 WO2004092926A2 (en) 2004-10-28
WO2004092926A3 true WO2004092926A3 (en) 2005-02-24

Family

ID=33298292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/009707 WO2004092926A2 (en) 2003-04-09 2004-03-31 Light wedge for illuminating a platen in a print scanner

Country Status (2)

Country Link
US (2) US6867850B2 (en)
WO (1) WO2004092926A2 (en)

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Also Published As

Publication number Publication date
WO2004092926A2 (en) 2004-10-28
US20050057742A1 (en) 2005-03-17
US7586591B2 (en) 2009-09-08
US6867850B2 (en) 2005-03-15
US20030206287A1 (en) 2003-11-06

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