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Technology Stocks : Identix (IDNX) -- Ignore unavailable to you. Want to Upgrade?

To: steve who wrote (25374)	12/18/2003 8:20:57 PM
From: steve	Read Replies (1) \| Respond to of 26039

Apparatus and method for electronically acquiring December 18, 2003 6:36pm U.S. Patents Patent Number 6665427 Issue Date 2003 12 16 Assignee Identix, Inc. Inventor(s) Keagy, John M. Pinkhasik, Naum Muzil, Alexander State/Country CA Title Apparatus and method for electronically acquiring fingerprint image with low cost removable platen and separate imaging device Abstract In one embodiment, a fingerprint sensing system includes a sheet prism having a sensing surface and a number of prismlets positioned opposite to the sensing surface. Each prismlet has an entrance surface and an exit surface, and is adjacent to another prismlet. The width of the sheet is more than ten times the maximum thickness of any one of the prismlets. When a finger is positioned on the sensing surface, a portion of the radiation entering a number of the entrance surfaces and incident at the sensing surface is reflected through total internal reflection. The reflected radiation emits from a number of the exit surfaces to create an image of the fingerprint. In another embodiment, the system further includes a second sheet prism stacked together with the previously described sheet prism. The second sheet prism has a flat surface and a number of prismlets positioned opposite to the flat surface, which faces the prismlets of the previously described sheet prism. The image formed with two sheet prisms can have lower distortion. In yet another embodiment, the fingerprint sensing system is incorporated into a flat-profile package using mirrors to fold radiation and to compress the height of the package. Exmp. Claim 1 Ex Claim text A fingerprint sensing system comprising: a sheet prism having a sensing surface, a plurality of rigid prismlets positioned opposite to the sensing surface, each prismlet having an entrance surface and an exit surface, each prismlet being adjacent to another prismlet, the width of the sheet being more than ten times the maximum thickness of any one of the prismlets; such that when a finger is positioned on the sensing surface, a portion of illumination radiation illuminating the system, entering a plurality of the entrance surfaces and incident at the sensing surface is reflected through total internal reflection and emitted from a plurality of the exit surfaces to create an image of the fingerprint. hoovers.com steve