JPS6159456B
A smoke detector includes a light-emitting circuit, a light-receiving circuit, a smoke detecting space between the light-emitting and receiving circuits, and an amplifier circuit connected to the light-receiving circuit amplifying the output of the light-receiving circuit at an output terminal. An o...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A smoke detector includes a light-emitting circuit, a light-receiving circuit, a smoke detecting space between the light-emitting and receiving circuits, and an amplifier circuit connected to the light-receiving circuit amplifying the output of the light-receiving circuit at an output terminal. An output comparison circuit is provided having an input terminal connected to the output terminal of the amplifier circuit and a voltage memory circuit is connected to another input terminal of the output comparison circuit. A detector circuit has one input terminal connected to the memory circuit and another input terminal connected to the output terminal of the comparison circuit, and a fire alarm circuit is connected to the detector circuit for operating an alarm when smoke from a fire fills such space between the light-emitting and receiving circuits, whereby contamination due to time and environmental factors has a minimal adverse effect on the detection of smoke in such space. |
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