Kuraray Co., Ltd.

Koji Abe

Katsuhiro Fujita

Shinji Hiramatsu

A method of producing an optical element, which includes a glass substrate and a sheet-like formed body, is provided. The sheet-like formed body is formed of an organic resin, one surface of which has a fresnel lens pattern and the other surface of which is bonded to the glass substrate. The sheet-like formed body is a thermoplastic polymer composition. A bonding surface of the sheet-like formed body facing the glass substrate is treated by irradiating active energy. A bonding surface of the glass substrate facing the sheet-like formed body is bonded to the bonding surface of the sheet-like formed body by using a silane coupling agent as a crosslinking agent.

Method of producing glass base material laminate, method of producing optical element, optical element, and concentrating photovoltaic device

Provided are an optical element and a concentrating photovoltaic device which are each capable of preventing warpage and deformation of an optical functional pattern formed in a surface thereof due to stress even in an environment with extreme temperature changes. An optical element () of a concentrating photovoltaic device () concentrating sunlight includes: a glass substrate () and a sheet-like molded body () which is made of an organic resin and includes a Fresnel lens pattern () in a surface and has the other surface bonded to the glass substrate (). The sheet-like molded body () has a tensile elastic modulus of 1500 MPa or less, a linear expansion coefficient of 7.0&#xd7;10/&#xb0; C. or less, an average transmittance of 85% or more in a wavelength range from 350 to 1850 nm at a thickness of 400 &#x3bc;m, and a haze value of 1.0% or less.

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Kamisu, Japan

Koji Abe