Image sensor having photodiodes of improved response to low inte

Details Image sensor having photodiodes of improved response to low inte Image sensor having photodiodes of improved response to low inte

1991-03-15

1992-03-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358209, 35821311, 2502081, 2502083, H04N 530, H04N 5335

Patent

active

050937278

ABSTRACT:
A one dimensional image sensor is disclosed which has a series of photodiodes to be electrically scanned by voltages developed by a sawtooth voltage for generating electric outputs representative of incident optical energy. The scanning voltages for the photodiodes have so far risen beyond their predetermined saturation points with each ramp of the sawtooth voltage, deteriorating the image sensor response to low intensity optical input in particular. This weakness of the prior art is overcome by providing a bias source which generates a periodically varying bias voltage having a series of ramps that are opposite in the direction of progress to the ramps of the sawtooth voltage.

REFERENCES:
patent: 3418652 (1968-12-01), Brooks
patent: 3432670 (1969-03-01), Dym
patent: 3448275 (1969-06-01), Hall
patent: 4461956 (1984-07-01), Hatanaka
patent: 4785191 (1988-11-01), Ondris
patent: 5006702 (1991-04-01), Kakinuma

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