Image sensing device

Details Image sensing device Image sensing device

1983-11-30

1987-03-24

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 315

Patent

active

046529276

ABSTRACT:
An image sensing device permits stable black level control by including therein image sensor driving circuit arranged to form an idle read signal immediately after each line portion of output is produced from an image sensor. The device includes a circuit for holding the idle read signal during a horizontal blanking period. A clamping circuit is included for clamping the output of the holding circuit at a predetermined reference potential. Finally, a reference potential forming circuit is arranged to form a reference potential using the signal level of a light shielded part of the image sensor.

REFERENCES:
patent: 4293877 (1981-10-01), Tsunekawa
patent: 4455576 (1984-06-01), Hashimoto et al.
patent: 4498105 (1985-02-01), Crawshaw
Chai, et al, "Noise Compensator . . . ", IBM Tech. Disclosure Bull., vol. 16, No. 4, Sep. 73, p. 1099.

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