| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-emitting and receiving device in which variation in the photocurrent generated from light-emitting elements can be minimized.SOLUTION: The light-emitting and receiving device includes a light-emitting part 10 having a light-emitting element 15 not having a single directivity, and a light-receiving part 20 having a light-receiving element 25 receiving a light beam irradiated from the light-emitting element 15, where the optical axis of the light-emitting part 10 is matched with the optical axis of the light-receiving part 20. A case for supporting any one or both of the light-emitting part 10 and light-receiving part 20 rotatably about the optical axis is provided. With such an arrangement, even if the light-receiving side directivity central axis and the light-emitting side directivity central axis are not aligned, the light-receiving side directivity central axis B and the light-emitting side directivity central axis A are aligned substantially, by operating an operation part 40 exposed from the case 31 through an aperture 39 so as to rotate any one or both of the light-emitting part 10 and light-receiving part 20. |
