Photo-coupler switch with delay function using a fluorescent sub

Details Photo-coupler switch with delay function using a fluorescent sub Photo-coupler switch with delay function using a fluorescent sub

1988-12-14

1989-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250229, 2504581, 341 31, 357 19, G01D 534

Patent

active

048475084

ABSTRACT:
A photo-coupler with delay function includes a fluorescent substance, a light-emitting diode disposed at one end of the fluorescent substance and a phototransistor disposed at the other end of the fluorescent substance. While a light emitted from the light-emitting diode is impinging on the fluorescent substance, it emits a fluorescence. The fluorescent substance emits a phosphorescence after an emission from the light-emitting diode is interrupted. In this arrangement, when the fluorescent substance is displaced with an operating plate, the light intermittently emitted from the light-emitting diode impinges on the fluorescent substance. The phototransistor selectively detects the light intermittently emitted from the light-emitting diode, the fluorescence and the phosphorescence both continuously emitted from the fluorescent substance.

REFERENCES:
patent: 3684827 (1972-08-01), Parry
patent: 4247211 (1981-01-01), Behrendt et al.
patent: 4306148 (1981-12-01), Ringwall et al.
patent: 4378968 (1983-04-01), Ely et al.
patent: 4429219 (1984-01-01), Yochum et al.
patent: 4521685 (1985-06-01), Rebman
patent: 4617461 (1986-10-01), Subbarao et al.
patent: 4641026 (1987-02-01), Garcia, Jr.
patent: 4692612 (1987-09-01), Havel

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