Fingerprint image input device having an image sensor with openi

Details Fingerprint image input device having an image sensor with openi Fingerprint image input device having an image sensor with openi

1994-05-11

1995-08-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

25022711, 356 71, G06K 500

Patent

active

054462908

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.

REFERENCES:
patent: 4206441 (1980-06-01), Kondo
patent: 4358677 (1982-11-01), Ruell et al.
Okumura et al., "Fingerprint Sensor Using Light-Separation Method with Silicon Rubber", Autumn Meeting of the Applied Physics Society of Japan, 18P-N-14, Jan. 1992.

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