Detector circuit for electrophotographic copier

Details Detector circuit for electrophotographic copier Detector circuit for electrophotographic copier

1976-08-02

1978-06-20

Pellinen, A. D.

Photocopying

Including fiber optics

250548, 323 21, 340259, 355 41, G03G 2100

Patent

active

040958876

ABSTRACT:
In electrophotographic copying apparatus utilizing a photoconductive belt having markings regularly spaced apart on its back side for control of the copying operations by moving past a detector comprising a light source and a photoelement to generate signal pulses, the detector is made to perform reliably notwithstanding variations of the sensitivity of the photoelement, or of the light emission, by the provision of a circuit for emitting a detector signal proportional to the amount of light sensed by the photoelement together with a signal modifying circuit that maintains an output signal level corresponding to the average value of the detector signal and a control circuit responsive to the output signal level for controlling the intensity of the light source.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 3359483 (1967-12-01), Biard
patent: 3740563 (1973-06-01), Reichard
patent: 3743405 (1973-07-01), Morse et al.
patent: 3926625 (1975-12-01), VAN DER Sterren
patent: 3947117 (1976-03-01), Basu et al.

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