| 摘要 |
PROBLEM TO BE SOLVED: To effectively arrange a humidity sensor in a structure for detecting the fire of a fire sensor. SOLUTION: In the fire sensor, which is provided with a light emitting element, a light receiving element for generating a light reception output based on light emission from the light emitting element, and an almost cylindrical dark box having a labyrinth structure in the periphery by forming a detection block between them, the humidity sensor is arranged inside the dark box and outside the visual field of the light emitting element. Thus, the humidity sensor can be provided from generating any noise light to the light receiving element, and from being any obstacle to any operation to obtain a fire detection output. COPYRIGHT: (C)2005,JPO&NCIPI
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