OPTICAL SPACE SIGNAL TRANSMITTER

摘要

PURPOSE:To receive a reflected light from a wall efficiently by receiving the light with an optical reception unit whose light collection capability is improved for the light from a planer direction only. CONSTITUTION:An optical transmission unit 11 has a radiation distribution with a strong radiation intensity in a direction almost along a plane 18 tying the optical transmission unit 11 and an optical reception unit 13 and the optical reception unit 13 has a light collection characteristic with a high light collection efficiency from a direction along the plane 18. Even when an obstacle 19 such as a person or an object shuts the optical transmission unit 11 and the optical reception unit 13, the light radiating in an oblique direction along the plane 18 is reflected in a wall face 20 and received efficiently by the optical reception unit 13 having the high light collection efficiency from the direction along the plane 18 by providing the radiation distribution to the optical transmission unit 11 and the light collection characteristic to the optical reception unit 13 in this way. Thus, the optical space signal transmission is attained even with the obstacle 19.