Smoke detector, adjustment apparatus and test apparatus for such a smoke detector
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United States of America Patent
Stats
-
Sep 30, 1997
Grant Date -
N/A
app pub date -
Dec 13, 1994
filing date -
Dec 16, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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