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

摘要

A light receiving device 7 includes a sensor 10 for outputting a signal correlating to incident light on a detection surface 10a and a light receiving element 8 disposed in confrontation with the detection surface and capable of transmitting light. The light receiving element has a recessed portion 22 on the opposite surface of the surface confronting the detection surface. A wall surface 24 of the recessed portion reflects the light beam L2 from a lateral direction of the detection surface toward the detection surface 10a.