| 摘要 |
PROBLEM TO BE SOLVED: To provide a smoke sensor wherein the workability of assembling of a smoke detection part body, an insect net and a labyrinth is improved to improve productivity. SOLUTION: This smoke sensor has the smoke detection part body 5 detecting smoke flowing into a chamber, the labyrinth 6 shielding light from the outside such that the light is not directly entered into the chamber, and the tube-like insect net 11 surrounding the periphery of the labyrinth 6. Radially narrowed guide parts 15 guiding the insect net 11, and radially projected ribs 16 firmly holding the insect net 11 are continuously provided in the vertical direction of the peripheral end of the labyrinth 6. By a fitting structure of protrusions and protrusion reception holes, the labyrinth 6 installed with the insect net 11 is assembled to the smoke detection part body 5 without aligning the protrusions with the protrusion reception holes and is relatively rotated to fit the labyrinth 6 in the smoke detection part body 5 in a position where the protrusions face to the protrusion reception holes. COPYRIGHT: (C)2004,JPO&NCIPI
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