Multiple copy and transparency detector with illumination contro

Details Multiple copy and transparency detector with illumination contro Multiple copy and transparency detector with illumination contro

1983-08-15

1986-03-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250223R, G01J 132

Patent

active

045770964

ABSTRACT:
A sheet detector having an emitter (lamp), detector (phototransistor), operational amplifier and an RC network. As contamination is deposited on the emitter or detector, a feedback loop provides more drive to the lamp providing sufficient drive to hold the emitter of the phototransistor at its desired stage. As a first copy paper is passed between the emitter and detector, the RC network of a common mode operational amplifier detects a change and generates an output. As a subsequent sheet enters the system, the transmissibility abruptly changes again causing the common mode operational amplifier to provide a subsequent pulse indicating the presence of a multiple feed.

REFERENCES:
patent: 3396965 (1968-08-01), Dennis et al.
patent: 3778051 (1973-12-01), Allen et al.
patent: 3882308 (1975-05-01), Daughton et al.
patent: 3932755 (1976-01-01), Sagawa
patent: 4097731 (1978-06-01), Krause et al.
patent: 4352013 (1982-09-01), Fasig et al.
patent: 4406996 (1983-09-01), Oka

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