| 摘要 |
PURPOSE:To provide a condensing device wherein a beam of incident light can be condensed on a solar cell irrespective of the position of the sun and a movement means such as a tracking device or the like is not required as well as the efficiency and the cost of power generation are enhanced. CONSTITUTION:A triangle-shaped prism (refractive index: 1.5) 1 is used, and a solar cell (refractive index: 3.5) 3 is attached and bonded to one of the sides (a condensing face) 1a of the sides enclosing right angle via a matching member 2. A mirror 4 is formed on an oblique side 1c on the other side of a triangle, The refractive index of the matching member 2 is set within a range of 1.5 to 3.5 so that a critical angle is not caused at boundary faces at the individual members 1, 2, 3. In addition, since a critical angle to the air from the side of the prism at a light-receiving face 1b is at 41.8 deg., a prism angle theta0 is set at 21 deg., and an angle of incidence thetan with reference to the light-receiving face of a beam of light which is reflected totally by the mirror and proceeds at the inside of the prism is set to be always larger than the critical angle. Thereby, at whichever angle an angle of incidence thetai on the prism is, the beam of light incident on the inside is reflected properly and repeatedly between the mirror and the light-receiving face and reaches the condensing face. |
