| 摘要 |
PURPOSE: A prism blind which can be used as an indirect lighting device by using a principle of refraction is provided to reduce illumination energy by using solar energy as illumination energy. CONSTITUTION: A prism blind which can be used as an indirect lighting device by using a principle of refraction is composed like next. A prism rotation controller(1) and a worm(2) are integrally composed. A worm gear(3) and a prism(4) are integrally composed. If the rotation controller revolves, the worm revolves and the prism, integrally formed with the worm gear, revolves using the rotation of the worm gear which is meshed with the worm. One face of the prism is made of an opaque part(5) in order to blind sun light. |
