Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-07-05
2005-07-05
Nguyen, Hung (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S628000, C340S629000, C340S577000, C340S578000
Reexamination Certificate
active
06914535
ABSTRACT:
A light scattering type smoke sensor comprising a holder with openings embedded with light emitting part and light detecting part respectively, which do not protrude into the smoke detection chamber. The optical axis of light emitting part intersects at a predetermined first angle α in the horizontal direction with the optical axis of the light detecting part at a predetermined second angle β in the vertical direction. The optical axis of the light emitting part and optical axis of the light detecting part further comprise a configuration angle δ in the range of 90˜120 degrees used as the supplementary angle for the scattering angle θ. Accordingly, the smoke detection part is further constituted in a thin-shaped light scattering smoke sensor which enables the setup of a scattering angle with no directivity in the smoke influx to the smoke detection chamber.
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European Search Report.
Dohi Manabu
Honma Hiroshi
Matsukuma Hidenari
Shima Hiroshi
Blank Rome LLP
Hochiki Corporation
Nguyen Hung
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