| 摘要 |
PURPOSE:To improve the light transmission efficiency and to miniaturize a curved-face mirror by contacting closely a refraction body of Fresnel shape where an irradiated light is refracted so as to be approached in the vertical direction to a low part reflecting plane of the curved-face mirror. CONSTITUTION:The optical axis of the light collecting device is tilted respectively by nearly 30 deg. to the east and west and each optical axis is tilted respectively by the latitude at its position from the zenith so as to arrange the lenses as the sunlight collecting lenses for use in the morning and afternoon. Further, the curved-face mirror M is arranged at the back side of both lenses so as to form the image of the sunlight to the light of the light transmission duct always within a prescribed range. The refraction body K of Fresnel shape where the irradiated light is refracted so as to approach in the vertical direction is adhered closely to the lower reflecting face of the curved-face mirror M. Then, the light is incident to the refraction body K of the curved-face mirror M from the condenser lens, the light is reflected on the curved-face mirror M and made incident again in the refraction body K, refracted and irradiated and made incident to the light transmission duct, thereby miniaturizing the curved-face mirror M and improving the light transmission efficiency. |
