| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fire sensor capable of preventing brightness decrease of the light emitted from an emitting surface of a light guide. <P>SOLUTION: The fire sensor includes a base attached to an installation plane and a main body 2 which is detachably attached to the base. The main body 2 is constituted of: a detector 3 for detecting occurrence of a fire; a light emitting element 6; a light guide 7 that allows the light from the light emitting element 6 to enter from an incidence plane 7a and go out from an emitting surface; a body 5 for storing the detector 3, the light emitting element 6, and the light guide 7; and a cover 8 engaged with the body 5. The light guide 7 is formed with a reflection plane 7c for reflecting the light entering through the incidence plane 7a toward the emitting surface side. The body 5 is formed with a window hole for exposing the emitting surface of the light guide 7. The cover 8 is formed with protrusion pieces 8 m which are deformable in a thickness direction at positions opposing the light guide 7 in a state being engaged with the body 5. Each of the protrusion pieces 8 m is formed with a projection 9 being opposite to the reflection plane 7c of the light guide 7 at the body 5 side. <P>COPYRIGHT: (C)2013,JPO&INPIT |
