Scattered light-type smoke detection apparatus

Abstract

[Problem to be Solved] To provide a scattered light-type smoke detection apparatus in which internally scattered light in a smoke detection space can be suppressed to improve the S/N ratio. [Solution] A scattered light-type smoke detection apparatus 1 includes: a smoke detection space 20 that is provided in a light-shielded area that is light-shielded from the outside, into which smoke particles flow from the outside; a light emitter 30 for emitting detection light toward the smoke detection space 20; and a light receiver 40 for receiving scattered light caused by detection light emitted by the light emitter 30 and scattered by smoke particles flowing into the smoke detection space 20, wherein the scattered light-type smoke detection apparatus 1 includes an internally scattered light suppressing means for transmitting and guiding part or the whole of detection light emitted by the light emitter 30 and passing through the smoke detection space 20 to a predetermined area or the outside of the light-shielded area to suppress internally scattered light within the light-shielded area.

Dependencies are inferred from the claim text.