PHOTOELECTRIC SMOKE DETECTOR

PROBLEM TO BE SOLVED: To provide a photoelectric smoke detector capable of suppressing erroneous detection due to stray light such as scattering light.SOLUTION: A photoelectric smoke detector includes: a housing 21 having a plurality of labyrinth form wall parts arranged side by side via a gap which allows a smoke to inflow from the outside and blocks light from the outside; a light emission part for emitting light to the interior of the housing 21; a light receiving part for detecting scattering light due to the smoke which inflows to the interior; and a reflection part for reflecting the light emitted from the light emission part. Cover members 25B, 26B covering one of the light emission part and the light receiving part and matching surfaces 25b, 26b between the light emission part and a storage part for storing one of the light emission part and the light receiving part are formed in such a manner so as not to interfere an optical axis A1 of the light emission part or an optical axis A2 of the light receiving part.SELECTED DRAWING: Figure 3 【課題】散乱光等の迷光による誤検出を抑制できる光電式煙感知器を提供する。【解決手段】外部からの煙を流入させると共に外部からの光を遮断するように間隙を介して並置された複数のラビリンス状の壁部を備えたハウジング２１と、ハウジング２１の内部に光を照射する発光部と、内部に流入した煙による散乱光を検知する受光部と、発光部から照射される光を反射する反射部と、を備えた光電式煙感知器であって、発光部および受光部の何れかを覆うカバー部材２５Ｂ，２６Ｂと、発光部および受光部の何れかを収容する収容部との合わせ目２５ｂ，２６ｂが、発光部の光軸Ａ１、或いは、受光部の光軸Ａ２に干渉しないように形成してある。【選択図】図３