| 摘要 |
A photovoltaic unit can minimally reduce a displacement of focus positions from solar cells and prevent a decrease in power generation efficiency even if elastic behaviors of a Fresnel lens sheet and a base plate on which solar cells are arranged due to changes in temperature and humidity are different. The photovoltaic unit includes an integrated multiple Fresnel lens sheet (1) and a base plate (2) on which solar cells (3) are arranged adjacent to the focus positions of individual Fresnel lenses (11). The multiple Fresnel lens sheet (1) is fixed to the base plate (2) by a lens sheet fixing element (5) at a lens sheet fixing portion (51) adjacent to the center of gravity of the sheet. |
