| 摘要 |
PROBLEM TO BE SOLVED: To control dispersion of light quantity of signal light made incident on a signal light incident end even if a positional relation between an incident position and an exit position of the signal light are relatively changed, by making a signal light emitting part control an emitting direction of the signal light made to exit from an end edge by a signal according to a position of signal light incident part. SOLUTION: Emitting angle control elements 26-28 receive a signal according to a position of, for example, a signal light incident part 17, on which a signal light is made incident, of three signal light incident parts 17-19. When this positional signal is inputted, for example, to an emitting angle control element 26, the emitting angle control element 26 controls an emitting direction of the signal light so that the signal light emitted from a signal light emitting part 23 is propagated toward a photo detector 32. Moreover, when a signal light is received from the signal light incident part 18 or 19, a positional signal according to the signal light incident parts 18, 19 is inputted to the emitting angle control elements 26-28, and the signal light reaching the signal light emitting parts 23-25 is controlled in the emitting angle by the emitting light control elements 26-28 so as to be propagated toward the photo detectors 32-34. |
