Exposure control device for a photocopier

Details Exposure control device for a photocopier Exposure control device for a photocopier

1981-01-21

1982-10-19

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 68, 355 69, G03G 1500

Patent

active

043547583

ABSTRACT:
According to an exposure control device for a photocopier of the present invention, a voltage corresponding to the voltage applied to an exposure lamp is produced by a dummy load circuit and a wave shaper. The light reflected by the manuscript is detected by a photodetector and is converted into a voltage. The output voltage of the wave shaper and the output voltage of the detector are added by an adding switch. The added output voltage and the reference voltage are input to an error amplifier and are compared. The output signal of the error amplifier is input to a trigger pulse generator. The trigger pulse generator supplies a trigger pulse to a thyristor connected to the exposure lamp for controlling the amount of light of the exposure lamp.

REFERENCES:
patent: 3743405 (1973-07-01), Morse et al.
patent: 3926518 (1975-12-01), Berry et al.
patent: 4124295 (1978-11-01), Gardiner
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4239374 (1980-12-01), Tatsumi et al.

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