PURPOSE: To reduce the light which leaks out of an optical housing by providing a reconverging lens which reconverges light from an optical filter and guides it to a projection part on an optical axis between a sector and the projection part nearby the sector.
CONSTITUTION: When a motor 23 is driven by a power source 2, the sector 22 begins to rotate and a tungsten electric bulb as a light source 6 illuminates and its light is converged through the half-lens 16 and a condenser lens 17 of an optical transmission part 18 and guided to the optical filter 28 of the sector 22 along the optical axis L1-L1. Then, the light from the optical transmission part 18 is intermitted by the sensor 22 to obtain AC-like light, and the optical filter 28 selects wavelength to pass. Further, this light is guided to the reconverging lens 30 and light which is diverged while guided from the optical filter 28 to the mirror 32 is converged right behind the optical filter 28, so that the light is guided to the mirror 32. Thus, the light leaking out of the optical housing 15 is reduced, and consequently the quantity of light supplied to the mirror 32 increases.
ARAI MICHIO
SUGIYAMA KIYOTAKA
| JPS56108940A | 1981-08-28 | |||
| JPS54143198A | 1979-11-08 |