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US 5,673,027 AGranted
Smoke detector, adjustment apparatus and test apparatus for such a smoke detector
AssigneeNohmi Bosai Ltd.
InventorToshikazu Morita
Life of this patent
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AssigneeNohmi Bosai Ltd.
InventorToshikazu Morita
Estimating the term…
An inexpensive smoke detector having excellent general versatility and reliability allows for an increase in a range of selecting light emitting devices used for such smoke detectors and allows for reductions in the number of processes and adjustment equipment, thereby reducing costs and avoiding human adjustment errors. The smoke detector includes an A/D conversion circuit for measuring an output from a photo transistor which receives a light output of at least a light emitting diode used for smoke detection. A MPU generates a signal for driving the light emitting diode, based on a value measured by the A/D conversion circuit. The smoke detector also includes an EEPROM. A D/A conversion circuit adjusts a light emission quantity of the light emitting diode based on a value read from the EEPROM. The smoke detector further includes a voltage/current conversion circuit.
A smoke detector comprising light emitting means having at least a light emitting device used for a smoke detection and light receiving means for receiving a light output from said light emitting device, said smoke detector further comprising:
A smoke detector comprising light emitting means having light emitting devices used for a smoke detection and testing, and light receiving means for selectively receiving a light output from each of said light emitting devices, said smoke detector further comprising:
A smoke detector comprising light emitting means having at least a light emitting device used for testing and light receiving means for receiving a light output from said light emitting device, said smoke detector further comprising:
Dependencies are inferred from the claim text.