Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1981-05-11
1984-02-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250221, 340556, H01J 4014
Patent
active
044343639
ABSTRACT:
A photoelectric switching apparatus includes a light transmitter part having a first built in oscillator and a detachable light transmitter circuit driven by the first oscillator. A detachable light emitter is provided for emitting light in response to a signal from the light transmitter circuit. A light receiver part includes a photoelectric transducer for converting a light signal incident thereon to a converted electric signal and a second oscillator which is separate from the light transmitter part and can be connected to the light transmitter circuit when the light transmitter circuit and the light emitter together are detached from the first oscillator. The light receiver part has a D-flip-flop which reads input data based on the converted electric signal by utilizing an output signal of the first oscillator as its clock pulse. The first oscillator issues an output signal which is substantially synchronous with the converted electric signal to the D-flip-flop by utilizing a signal based on the converted electric signal when the light transmitter circuit and the light emitter are detached from the first oscillator. The first oscillator issues an output signal which drives the light transmitter circuit, to the D-flip-flop when the light transmitter is connected to the first oscillator.
REFERENCES:
patent: 3704461 (1972-11-01), Rose et al.
patent: 3924253 (1975-12-01), Marino
patent: 4068222 (1978-01-01), Treviranus
patent: 4266124 (1981-05-01), Weber et al.
patent: 4272762 (1981-06-01), Geller et al.
Fukutake Katsuhiko
Miyazaki Masaharu
Uyama Seiichi
Yorifuji Yuki
Matsushita Electric & Works Ltd.
Nelms David C.
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