Patent ID: 9165448
Filing Date: 2015-10-20
Classification: G01N,G08B

Abstract:
1. A smoke detector, comprising: a main body; a light emitting section; a light receiving section; a smoke detecting section, an aperture member for narrowing the light emitted from the light emitting section, wherein the aperture member is configured to be mounted to a receiving portion provided to the main body, and comprises a lower surface portion formed into an arc shape, wherein the receiving portion of the main body comprises a bottom surface portion formed into a shape corresponding to the arc shape of the lower surface portion of the aperture member so as to be brought into contact with the lower surface portion of the aperture member, and wherein the aperture member comprises a light passage opening formed so that the light passage opening is decentered from a center position in the upper, lower, left, and right directions of the aperture member, but a center position thereof substantially matches with a position of a center of curvature of the arc shape of the lower surface portion.