Exposure control device

Details Exposure control device Exposure control device

1991-02-05

1991-11-12

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821399, H04N 5238

Patent

active

050652486

ABSTRACT:
An exposure control device includes a first exposure control circuit which is arranged to keep constant an average signal level of an image signal corresponding to the whole of an image sensing plane, and a second exposure control circuit which is arranged to compensate the average signal level according to the level of an image signal corresponding to a light measuring area set in a part of the image sensing plane. The second exposure control circuit has a response characteristic arranged to have its exposure control action performed at a slower response speed than the first exposure circuit.

REFERENCES:
patent: 4409472 (1983-10-01), Kimura
patent: 4427996 (1984-01-01), Tamura
patent: 4535364 (1985-08-01), Hirobe
patent: 4825293 (1989-04-01), Kobayashi et al.
patent: 4884144 (1989-11-01), Jinnai et al.

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