PURPOSE: To obtain a light beam spread along a non-planar basic conical surface which is parallel to the curvature of the earth by redirecting a light beam emitted from a light source fixed to a chassis to an omnidirectional basic field in the horizontal direction and making the transmitter horizontal in a self- aligning way.
CONSTITUTION: A transmitter 10 is constituted principally of a light source 27 and a reflecting device 28 and flatly mounted on a tripod 12. The light source 27 emits a parallel light beam to the bottom section of the reflecting device 28 and the device 28 redirects the parallel light beam downward into a light beam spread along a non-planar basic conical surface 14. The light beam from the light source 27 is adjusted so that the light beam can be made incident on the truncated conical surface 103 of a weight 102 by using a steering window 44 and a parallel lens assembly 70 and the axial line of the parallel light beam is calibrated so that the axial line can be aligned with that of the surface 103 by using four receivers 15 arranged at regular intervals from the center of a basic cone 14. Therefore, the light beam of the cone 14 can be obtained from a housing 94, because the transmitter 10 is of a self-horizontal type within the error range near the vertical line.
JIYOSEFU EFU RANDOO
TETSUDO ERU TEIICHI
ROORENSU JIEI MEIYAASU
SEODOA JIEI MAAKUREI
| JPS6295418A | 1987-05-01 | |||
| JPS61217716A | 1986-09-27 | |||
| JPS61205818A | 1986-09-12 |