Contact image sensor utilizing differential voltage pickoff

Details Contact image sensor utilizing differential voltage pickoff Contact image sensor utilizing differential voltage pickoff

1995-09-22

1998-03-03

Faile, Andrew

Television

Camera, system and detail

Combined image signal generator and general image signal...

345245, H04N 5335, H04N 964

Patent

active

057240949

ABSTRACT:
A contact image sensing system that eliminates the use of npn phototransistors. The device comprises a plurality of sensing elements, a like number of dummy sensing elements, control and drive clocks, a digital scanning shift register, and a differential amplifier. The device operates by sequentially reading the voltage output of the sensors, then comparing that output with the output of the dummy sensors so that any noise or offset in the signal can be cancelled by a differential amplifier.

REFERENCES:
patent: 3949162 (1976-04-01), Malueg
patent: 4916307 (1990-04-01), Nishibe et al.
patent: 5268764 (1993-12-01), Kihara et al.
patent: 5268765 (1993-12-01), Yamashita

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