High performance contact image sensor

Details High performance contact image sensor High performance contact image sensor

1996-03-06

1998-07-21

Stoll, Thomas I.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358483, 2502081, H04N 104

Patent

active

057841780

ABSTRACT:
A contact image sensor is provided with a modified photodevice module and method of operation. The photodevice modules convert the video signals created by the sensed lights from an electrical charge to electrical voltage immediately upon stimulation of the photodevice, and hold the electrical voltage at another element in the photodevice module so that the voltage can be immediately output when the shift register output switch is turned on. A dark current elimination circuit is also provided and includes a light-shielded photodevice which produces a dark current reference signal representative of the expected dark current in the photodevices of the photodevice modules. This dark current reference signal is used to adjust the electrical charge created by the light stimulation of the photodevice.

REFERENCES:
patent: 4511804 (1985-04-01), Ozawa
patent: 4831454 (1989-05-01), Tamka et al.
patent: 4866291 (1989-09-01), Shimada et al.
patent: 5214272 (1993-05-01), Ueno
patent: 5408113 (1995-04-01), Kanno et al.
patent: 5514989 (1996-05-01), Sato et al.

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