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    • 3. 发明专利
    • SOLAR GUIDE
    • JPS6481104A
    • 1989-03-27
    • JP23709387
    • 1987-09-24
    • YAMAZAKI TAMIOYAMADA HIROE
    • YAMAZAKI TAMIOYAMADA HIROE
    • F21V9/04F21S11/00F21V8/00
    • PURPOSE: To efficiently send out only visible light of good quality, by a simple structure equipped with a condenser lens, a lens control part, an optical ray selector and an optical fiber. CONSTITUTION: A control part 2 supports a plastic Fresnel lens 1 with heat ray cutoff plating applied, and drives a pulse motor for angle control 3, 4 so as to face it toward the sunlight. Light condensed by the lens 1 is sent to an optical fiber 7 by an optical path 6. A selector 5 is placed there to send only visible light to the optical fiber 7. The selector consists of a cold mirror 20 which transmits a heat ray, an infrared ray and an ultra violet ray and reflects the visible light and a heat ray cutoff filter 19 to transmit the visible light only. The cold mirror 20 has a recessed surface and effectively sends light to the optical fiber 7. The outside of the optical fiber 7 is covered by black polyethylene with about 50 pieces bundled. As for a light generating part 8 at the end, in accordance with the purpose, a spot diameter can be changed by an adjusting lens 9 for instance, and illumination can be changed by a color filter 10. By this structure, optical energy can be effectively taken out and utilized by adequately inducing the sunlight.