Smoke detector

摘要

An aperture member (15) is configured to be mounted to a receiving portion (22) provided to a main body (2), and includes a lower surface portion (15a) formed into an arc shape. The receiving portion (22) of the main body (2) includes a bottom surface portion (22a) formed into a shape corresponding to the arc shape of the lower surface portion (15a) of the aperture member (15) so as to be brought into contact with the lower surface portion (15a) of the aperture member (15). The aperture member (15) includes a light passage opening (15e) formed so that a center position (15ea) thereof substantially matches with a position of a center of curvature of the arc shape of the lower surface portion (15a).

主权项

1. A smoke detector, comprising:
a main body; a light emitting section; a light receiving section; a smoke detecting section,
the smoke detector being configured to detect smoke or contaminants in such a manner that the light receiving section receives scattered light generated when light emitted from the light emitting section is scattered in the smoke detecting section due to particles of the smoke or the contaminants; and 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.