Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-12-26
1997-06-03
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
382127, G06K 1100
Patent
active
056357230
ABSTRACT:
A fingerprint image input apparatus comprises a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance, a two-dimensional image sensor capable of allowing the light to pass through, and an optical part for guiding light from the plane light source, having passed the two-dimensional image sensor, to a finger and guiding light reflected at the finger to the photoelectric converting element. The two-dimensional image sensor includes a plurality of pixels arranged in a matrix form. A bias power source for supplying a bias voltage to the individual pixels, a scanning circuit for outputting a scan signal to the pixels and a first detecting circuit for detecting photoelectric data signals from the pixels are connected to those pixels via bias lines, scan lines and data lines. Connected to the bias lines are a signal generator for generating a finger detection signal to detect the contact of a finger with the optical part and a signal detecting circuit for detecting a change in the finger detection signal. A switch controller outputs a control signal in accordance with a finger detection mode and a fingerprint image input mode. According to the control signal, first and second switch circuits control the connection between the signal generator and the second detecting circuit.
REFERENCES:
patent: 4429413 (1984-01-01), Edwards
patent: 4577345 (1986-03-01), Abramov
patent: 5325442 (1994-06-01), Knapp
patent: 5429006 (1995-07-01), Tamovi
patent: 5446290 (1995-08-01), Fujieda et al.
Fujieda Ichiro
Kaneko Setsuo
Giles Alan L.
NEC Corporation
Westin Edward P.
LandOfFree
Fingerprint image input apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fingerprint image input apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fingerprint image input apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-393266