Dirt insensitive optical paper path sensor

Details Dirt insensitive optical paper path sensor Dirt insensitive optical paper path sensor

1984-09-27

1987-06-02

Grimley, A. T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

355 14SH, 271265, 271259, 271263, G03G 1500, E04G 1706

Patent

active

046706470

ABSTRACT:
The present invention is concerned with a self-adjusting document sensor compensating for degradation of the sensor system. A suitable light source and a detector are provided, the output of the detector being fed into an amplifier whose gain depends upon a feedback signal. Periodically, the output of the amplifier is compared to a reference. If the output of the amplifier falls below the reference, a pulse is sent to a ripple counter whose digital output is fed back to the amplifier to change the gain of the amplifier. If the detector is an unbiased photodiode operating in the transconductance mode, the leakage currents and their subsequent effect on output with amplifier gain changes will be minimized.

REFERENCES:
patent: 3789215 (1984-01-01), Penny
patent: 4097731 (1978-06-01), Krause et al.
patent: 4097732 (1978-06-01), Krause et al.
patent: 4133008 (1979-01-01), Tisue

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