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Publication numberWO2004092926 A3
Publication typeApplication
Application numberPCT/US2004/009707
Publication date24 Feb 2005
Filing date31 Mar 2004
Priority date9 Apr 2003
Also published asUS6867850, US7586591, US20030206287, US20050057742, WO2004092926A2
Publication numberPCT/2004/9707, PCT/US/2004/009707, PCT/US/2004/09707, PCT/US/4/009707, PCT/US/4/09707, PCT/US2004/009707, PCT/US2004/09707, PCT/US2004009707, PCT/US200409707, PCT/US4/009707, PCT/US4/09707, PCT/US4009707, PCT/US409707, WO 2004/092926 A3, WO 2004092926 A3, WO 2004092926A3, WO-A3-2004092926, WO2004/092926A3, WO2004092926 A3, WO2004092926A3
InventorsDean J Fedele, George W Mcclurg
ApplicantCross Match Technologies Inc, Dean J Fedele, George W Mcclurg
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
Light wedge for illuminating a platen in a print scanner
WO 2004092926 A3
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.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US6240200 *29 Aug 199729 May 2001Barry M. WendtOptical fingerprint imager with improved optics
US6259108 *9 Oct 199810 Jul 2001Kinetic Sciences Inc.Fingerprint image optical input apparatus
US6414749 *14 Dec 19992 Jul 2002Mitsubishi Denki Kabushiki KaishaUneven-pattern reading apparatus
US6485981 *28 Jul 199926 Nov 2002Ciencia, Inc.Method and apparatus for imaging and documenting fingerprints
US6643390 *19 Apr 20004 Nov 2003Polaroid CorporationCompact fingerprint identification device
Classifications
International ClassificationH04N1/04, G06K9/00, G06T1/00, A61B5/117, G06K9/74, G06F, G06K9/20
Cooperative ClassificationG06K9/2036, G06K9/00046
European ClassificationG06K9/20E, G06K9/00A1G
Legal Events
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