Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1990-07-11
1991-10-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
250211J, G02B 2700
Patent
active
050598090
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: 3535532 (1970-10-01), Merryman
patent: 4520381 (1985-05-01), Moriguchi et al.
patent: 4739174 (1988-04-01), Nagano
patent: 4757190 (1988-07-01), Ando et al.
Astex Co., Ltd.
Nelms David C.
Shami K.
Takenaka Electronic Industrial Co., Ltd.
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