| 摘要 |
Provided are an optical element and a concentrated photovoltaic device that are able, even in environments in which there are large variations in temperature, to prevent warpage, and stress deformation in the optically functional pattern formed on the element surface. The optical element (4) of the concentrating solar power device (1) is for concentrating solar light, and includes: a glass substrate (5); and a sheet-like molded body (6) that comprises an organic resin, has one surface that has a Fresnel lens pattern (6a), and another surface that is bonded to the glass substrate (5). The sheet-like formed body (6) has: a tensile elastic modulus of 1500MPa or less; a linear expansion coefficient of 7.0x10-5/°C or below; an average transmittance of 85% or more, in a wavelength band of 350-1850nm at a thickness of 400µm; and a haze value of 1.0% or less. |
