| 摘要 |
PURPOSE:To align the optical axes of transmitter receivers with each other by supplying light beams from plural light sources to one-terminal sides of respective optical fibers, bundling other-terminal sides of those optical fibers and forming light sources for propagation, and using one of them as a visible light source. CONSTITUTION:A large-diameter lens 2 is provided to an opening part at one end of a housing 1 and near infrared modules 4a-4f are installed in the housing 1 on a circumference having its center at the optical axis of a plane 3 distant from the focal plane of the lens 2. Then plural light sources 4a-4f and plural optical fibers 6a-6f which guide light from those light sources are provided and the optical fibers are bundled (bundle 8) closely to form a light guide; and the light beams from this light guide are propagated (projection beam 10) in a space through one lens system 2 and the visible light source is used as the light source corresponding to the center optical fiber among the optical fibers 6a-6f which are bundled most closely. Consequently, the optical axes of the transmitter receivers are aligned with each other.
|
