Document scanning device

Details Document scanning device Document scanning device

1986-10-29

1988-10-18

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 14E, 355 69, 355 55, G03B 2774

Patent

active

047791217

ABSTRACT:
A document scanning device such as a copier has defined within itself a point at which the brightness of an original document is detected and a separate point at which the document is scanned. The level of light exposure given to the document is controlled according to the detected brightness. The distance between the aforementioned two points is set with the delay time of an exposure control circuit taken into account. The delay time is set according to the fastest scanning speed of the device and is increased by means of a delay circuit if the scanning speed is deceased.

REFERENCES:
patent: 4636063 (1987-01-01), Takai et al.

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