The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 2017
Filed:
Jul. 09, 2013
Kuraray Co., Ltd., Kurashiki-shi, JP;
KURARAY CO., LTD., Kurashiki-shi, JP;
Abstract
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 7.0×10/° C. or less, an average transmittance of 85% or more in a wavelength range from 350 to 1850 nm at a thickness of 400 μm, and a haze value of 1.0% or less.