Control device, distance measuring device, and control method

A distance measuring device comprising:

• a light projecting unit that emits pulsed emission light;
• a light receiving unit in which a plurality of pixels each detecting incidence of photons is arranged;
• a detection unit that detects an echo with respect to the emission light based on a physical quantity of the photons output from each of the pixels;
• a determination unit that, in a case where a saturated echo in which the echo is saturated for a predetermined time or more is detected by the detection unit, determines an invalidation section such that a start time point of the invalidation section invalidating the pixel that has detected the saturated echo is set as a start time point of the saturated echo and the invalidation section gradually decreases every time the emission light is emitted;
• and
• a pixel control unit that invalidates the pixel according to the determined invalidation section and causes the light projecting unit to emit the emission light.