| 摘要 |
A proximity sensor includes a circuit board provided with a processing circuit, a light emitting device mounted on the surface of the circuit board, and a light-transmitting cylindrical light guide surrounding the portion of the circuit board having the light emitting device mounted thereon and guiding the outgoing light from the light emitting device to be emitted to outside. The cylindrical light guide includes the first light emitting surface as the first light outgoing region causing the light emitted from the light emitting device to pass therethrough and directly emitting the light to outside, a reflective surface reflecting the light emitted from the light emitting device to guide the light through the cylindrical light guide in the circumferential direction, and the second light emitting surface as the second light outgoing region emitting, to outside, the light reflected on the reflective surface and propagated through the cylindrical light guide. |
