Patent ID: 9046624
Filing Date: 2015-06-02
Classification: G01V

Abstract:
1. An infrared security sensor device for detecting a change in a detection signal level, caused by the interception of infrared rays of light, to detect an object and then issuing a warning, which sensor device comprises: a light projector for projecting infrared rays of light for object detection purpose; a light receiver for receiving the projected infrared rays of light and then outputting a detection signal; and an optical axis adjusting unit for adjusting a projecting light direction of the light projector and a receiving light direction of the light receiver; in which the light projector comprises a light projecting power control unit for controlling the light receiving sensitivity of the light receiver by switching the light projecting power of such light projector to one of a plurality of steps on the basis of the level of the detection signal and a status determining unit for determining one of an optical axis adjustment status and an alarm status; in which the light projecting power control unit includes a manual adjusting sector and for manually adjusting the switching of the steps of the light projecting power during an optical axis adjustment and an automatic adjusting sector for automatically adjusting the switching of the steps of the light projecting power during the optical axis adjustment; and in which the light projector is provided with an adjustment selecting sector capable of selectively selecting one of the manual adjusting sector and the automatic adjusting sector, the stepwise switching of the light projecting power is manually adjusted, for each of the steps in dependence on distance between the light projecting unit and the light receiving unit by the manual adjusting sector during the optical axis adjustment, and the automatic adjusting sector, successively with the manual adjusting sector, automatically adjusts the light receiving sensitivity in dependence on the detection signal level for each step.