MODEL-USE LIGHT RECEIVING DEVICE, MODEL, AND MODEL-USE SIGNAL LIGHT DETECTION METHOD

摘要

A light receiving device (7) comprising a sensor (10) for outputting a signal correlated with a light incident to a detection surface (10a), and a light-transmittable light receiving element (8) provided oppositely to the detection surface. The light receiving element is provided with a recessed portion (22) in the surface thereof opposite to the surface facing the detection surface. The wall surface (24) of the recessed portion reflects a ray of light L2 from the side direction of the detection surface toward the detection surface (10a).