SMOKE DETECTOR

To provide a smoke detector capable of preventing an erroneous detection by preventing steam from flowing into a smoke detection unit.SOLUTION: In a smoke detector 1 comprising: a smoke detection unit 4 having a light emitting element and a light receiving element; and a smoke flow path 5 for conducting smoke into the smoke detection unit 4, in which smoke is detected by that the light receiving element receives light of the light emitting element scattered by the smoke conducted into the smoke detection unit 4, the smoke detector further comprises a Peltier element 7 for cooling and heating the smoke flow path 5; and the smoke detector is configured such that when the Peltier element 7 is controlled to a cooling side, a water content of the steam flowing into the smoke flow path 5 can be condensed or frozen, and when the Peltier element 7 is controlled to a heating side, the water produced by the condensation is evaporated, or the ice produced by the freezing is melted or evaporated after melting so that it can be discharged from the smoke flow path.SELECTED DRAWING: Figure 1 【課題】湯気が検煙部内に流入することを防止し、誤検知を防止可能な煙感知器を提供する。【解決手段】発光素子と、受光素子と、を有する検煙部４と、検煙部４へと煙を導入するための煙流路５と、を備え、検煙部４に導入された煙によって散乱した該発光素子の光を受光素子が受光することで煙検知を行う煙感知器１において、煙流路５を冷却及び加熱をするためのペルチェ素子７を更に備えており、ペルチェ素子７が冷却側に制御された際には、煙流路５に流入した湯気の水分を凝結又は凍結可能に、ペルチェ素子７が、加熱側に制御された際には、該凝結によって生じた水を蒸発若しくは該凍結によって生じた氷を融解又は融解後蒸発させて該煙流路より排出可能に構成する。【選択図】図１