LIGHT TYPE DETECTOR

To provide a light type detector capable of eliminating the effect on the amount of received light due to factors unrelated to the progress of optical axis adjustment.SOLUTION: In a light type detector, by disabling a light projecting unit 111B and a light receiving unit 121B in conjunction with the opening of a cover during optical axis adjustment, modulated light R2 is not produced, so that a tool such as a screwdriver or the hand of an optical axis adjuster do not block the modulated R2 when an optical axis adjustment unit 113 and an optical axis adjustment unit 123 are operated. Thus, there occurs no fluctuation in the amount of received light due to factors unrelated to the progress of optical axis adjustment, and the complexity of optical axis adjustment can be eliminated.SELECTED DRAWING: Figure 2 【課題】光軸調整の進度に関係の無い要因による受光量への影響を除去する光線式検知装置を提供する。【解決手段】光線式検知装置において、光軸調整時にカバーを開けることに連動して投光部１１１Ｂや受光部１２１Ｂを無効とすることにより、変調光Ｒ２が生じなくなるため光軸調整部１１３や光軸調整部１２３を操作する際にドライバーなどの工具や光軸調整者の手が変調光Ｒ２を遮ることがなくなり、光軸調整の進度に関係の無い要因による受光量の変動が発生せず、光軸調整の煩雑さが解消される。【選択図】図２