Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-01-08
1988-07-12
Orsino, Jr., Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340628, 340587, 250565, 250574, G08B 1710
Patent
active
047573066
ABSTRACT:
A separation type light blocking smoke detector detects smoke present between a light emitting section and a light receiving section spaced therefrom by detecting blocking of light between the light emitting section and the light receiving section. The detector includes a light emitting section driving circuit, a counting circuit, and a storage circuit. The light emitting section driving circuit changes the emission intensity of the light emitting section in accordance with a predetermined changing mode for every repetitive cycle. The counting circuit includes a first comparator and an updating signal generator, and counts a physical amount corresponding to a period during which an output from the light emitting section falls in a predetermined range for each repetitive changing cycle. The storage circuit includes a second comparator and an AND gate, and stores a count value of the counting circuit in an arbitrary repetitive cycle. The count value stored in the storage circuit and that from the counting circuit are compared by a third comparator.
REFERENCES:
patent: 4308531 (1981-12-01), Yamamoto
patent: 4586026 (1986-04-01), Braig
patent: 4638304 (1987-01-01), Kimura
Jackson Jill D.
Nittan Co., Ltd.
Orsino Jr. Joseph A.
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