Image input apparatus for resetting the amount of exposure from

Details Image input apparatus for resetting the amount of exposure from Image input apparatus for resetting the amount of exposure from

1988-08-11

1990-10-16

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358210, H04N 5238

Patent

active

049639862

ABSTRACT:
An image input apparatus having a lens unit and a photoelectric transducer and includes an automatic exposure circuit for controlling an amount of exposure onto the photoelectric transducer so that it becomes a predetermined standard value, a correction circuit for modifying the standard value, and a reset circuit for converting a correction value corrected by the correction circuit into the aforementioned standard value. Also provided is a controller for selecting a first mode for modifying data representing an amount of light exposure on the photoelectric transducer, and a second mode for modifying data representing a focal length of the lens unit. The reset circuit further includes a common increase/decrease change-over switch for increasing and decreasing corresponding data in each mode selected by the controller.

REFERENCES:
patent: 3417198 (1968-12-01), Loyd
patent: 4120004 (1978-10-01), Coutta
patent: 4225886 (1980-09-01), Smith
patent: 4326221 (1982-04-01), Mallos et al.
patent: 4543609 (1985-09-01), Smith

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