| 摘要 |
PURPOSE: A photoelectric smoke detector is provided to form a plurality of apertures without cost rise by using a molding structure in molding a resin. CONSTITUTION: A photoelectric smoke detector includes a receiving part of a light emitting device and apertures(61,62). The receiving part of the light emitting device receives a light emitting diode as the light emitting device. The apertures are installed in a front part of the receiving part of the light emitting device. The apertures have different lengths from the light emitting diode. A diameter of a width direction of the apertures is increased in proportion to a distance from the light emitting diode. |
