Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-12-19
2006-12-19
Nguyen, Hung (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S630000, C340S539110, C340S556000, C340S583000, C340S686600
Reexamination Certificate
active
07151460
ABSTRACT:
A smoke detection device for use in a portable device such as a mobile terminal. The smoke detection device comprises a light emitter and a light detector disposed on different locations on the portable device so that when smoke or an intruding object is presence in the light path of the light emitter outside the device housing, it causes the light emitted by the light emitter to be scattered or reflected. When the light detector senses the scattered or reflected light, it can cause an alarm signal to be produced by the portable device. The emitted light can be in the infrared region so that the detection is independent of the ambient light. Alternatively, the light emitter is operated in a pulsed mode. Additional light emitter and light detectors can be disposed on the portable device for proximity sensing in addition to smoke detection.
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Kaikuranta Terho
Mäkelä Jakke
Nguyen Hung
Ware Fressola Van Der Sluys & Adolphson LLP
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