Fingerprint image input device having an image sensor with openings
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United States of America Patent
Stats
-
Aug 29, 1995
Grant Date -
N/A
app pub date -
May 11, 1994
filing date -
May 13, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A two-dimensional image sensor 12 having openings 28 through which light can pass is formed on a transparent substrate 21 and combined with a planar light source 11 and an optical element 13 which defines optical paths. The optical element 13 is formed by combining one of a diffraction grating, a microlens and a specular surface of V-shaped grooves with a collected fiber member formed from bundled optical fibers having light shielding side faces so as to allow the transfer of an image. The profiles of these components are determined so that light may be focused upon a finger contacting area on the center line between the openings 28 and photo-sensitive elements 24 of the sensor 12.
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