Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-07-23
1994-12-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250561, 358498, H01J 4014
Patent
active
053713532
ABSTRACT:
In an image forming apparatus, the passage of paper is detected by light and compact optical sensor apparatus including a plurality of light emitting devices, a plurality of optical sensor units, each of which includes an optical sensor disposed so as to receive the light from the light emitting device and an output circuit for selectively outputting a signal from the optical sensor, and a control unit connected to the optical sensor units through common cables. The output circuit of each optical sensor unit passes the sensor signal from the optical sensor of the unit to an output terminal or outputs the signal to one of the terminals of the unit, according to a selection signal generated at the control unit for exclusively designating the optical sensor units. Since each optical sensor unit outputs the sensor signal only when selected, all optical sensor units can use a common output cables, thereby reducing the weight and the size of the apparatus.
REFERENCES:
patent: 4864651 (1989-09-01), Ogiwara et al.
patent: 4985636 (1991-01-01), Fukui et al.
patent: 5053616 (1991-10-01), Trett
Le Que T.
Nelms David C.
OKI Electric Industry Co., Ltd.
Rabin Steven M.
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