Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-07-11
1991-07-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214A, H01J 4014
Patent
active
050346016
ABSTRACT:
A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes. The photoelectric switch includes a support circuit external of the integrated circuit for supporting the various functions provided via the first to fourth pins and two additional pins used in providing operating power.
REFERENCES:
patent: 4614866 (1986-09-01), Liss et al.
patent: 4940889 (1990-07-01), Ono et al.
Astex Co., Ltd.
Nelms David C.
Takenaka Electronic Ind. Co. Ltd.
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