| 摘要 |
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.
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