LIGHT SOURCE MODULE, RANGING DEVICE, AND CONTROL METHOD

The present invention accurately detects a damage, peeling, and the like of a diffusion plate. A light source module according to an embodiment is provided with: a light source (121); a housing (125) accommodating the light source and having an emission opening through which light emitted from the light source is emitted; a cover member (125) provided in the emission opening of the housing and transmissive to the light emitted from the light source; a waveguide (126, 127) for guiding part of the light emitted from the light source in a direction different from a travelling direction of the light emitted from the light source; a detecting unit (131) for detecting a light amount of the light guided through the waveguide; and a drive unit (120) which drives the light source on the basis of the light amount detected by the detecting unit. 本申请准确地检测扩散板的损坏、剥离等。根据实施例的光源模块包括光源(121)；壳体(125)，容纳光源并包括发射开口，从光源发射的光通过发射开口发射；盖构件(125)，设置在壳体的发射开口处，从光源发射的光通过盖构件透射；波导(126，127)，将从光源发射的光的一部分引导到与从光源发射的光的行进方向不同的方向上；检测单元(131)，检测经由波导引导的