Automatic exposure control for a photocopying machine

Details Automatic exposure control for a photocopying machine Automatic exposure control for a photocopying machine

1982-08-03

1984-07-17

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

353 3R, 353 14R, 118691, 430 30, G03G 1500

Patent

active

044602707

ABSTRACT:
An automatic exposure control method for a photocopying machine is disclosed herein. A sensor is periodically interposed in the light path of the photocopier, which samples the intensity of the light produced by the light producing system. This intensity is compared with a signal representative of the optimum light intensity for the photosensitive drum, and the light source is controlled by inputting the resulting intensity control signal to a voltage regulated light source control device.

REFERENCES:
patent: 3926518 (1975-12-01), Berry et al.
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4215930 (1980-08-01), Miyakawa et al.
patent: 4284344 (1981-08-01), Okamoto et al.
patent: 4390266 (1983-06-01), Uchida

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