Kuraray Co., Ltd.

Youji Ono

Makoto Toyohara

Ichiro Matsuzaki

Katsuhiko Hayashi

Tatsuya Ueda

Fumikazu Endo

Yutaka Aoyama

Yasuhisa Komatubara

Toshiei Kiriu

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 and a base plate on which solar cells are arranged adjacent to the focus positions of individual Fresnel lenses. The multiple Fresnel lens sheet is fixed to the base plate by a lens sheet fixing element at a lens sheet fixing portion adjacent to the center of gravity of the sheet.

Photovoltaic equipment

A design method for an optical sheet for solar concentration and an optical sheet for solar concentration obtained by means of the design method are disclosed. The design method is characterized in that, for a resin optical sheet for solar concentration containing an ultraviolet absorber in a base material thereof, an amount of the ultraviolet absorber to be contained in the base material is determined such that: in an accelerated degradation test by means of a metal-halide-lamp weathering test (device specification: JTM G 01:2000, Japan Testing Machinery Association), decrease in average transmittance in a wavelength range of 400 nm to 1850 nm after testing for an irradiation time Tsatisfies the following equation (1)&#x3c4;(0)+&#x3c4;()&#x3e;&#x3c4;(0)+&#x3c4;()&#x2003;&#x2003;(1)and that decrease in transmittance at each of wavelengths in the wavelength range from a corresponding initial value after testing for the irradiation time Tis not greater than 10%. Tis the accelerated test time required corresponding to the actual location of use. The optical sheet of the present invention is capable of efficiently concentrating light without decrease in transmittance while being used for a long time in an environment with a large amount of ultraviolet radiation.

Fresnel lens sheet for solar concentration and design method therefor

Provided is a surface light emitter that supplies light using a light guide method, and ensures transparency by lowering a haze value in a thickness direction at the time when a light source is turned off, and enables highly efficient light emission by using plate-surface transversal radiant emitted light at the time when the light source is on. A surface light emitter () including light diffusing particles guides light in a length direction of the light guide while scattering the light in the thickness direction of the light guide while scattering the light in the thickness direction of the light guide, and a calculated value (m/%) obtained by dividing a luminance attenuation coefficient E (m) by a haze value (%) per 5 (mm) thickness of the light guide is greater than or equal to 0.55 (m/%) and less than or equal to 10.0 (m/%).

Light emitter

A method and an apparatus for producing a pattern forming sheet efficiently. The method and apparatus for producing a sheet having a first pattern formed on at least one side by a first roll forming die and a second pattern formed by a second roll forming die is characterized in that the rotational angular speeds of the first and second roll forming dies are substantially equalized and relative positional variation of the first and second patterns is substantially minimized by synchronizing the phases of the periodic positional variation caused by the rotation of the rolls.

Forming sheet, lenticular lens sheet production method, and their production apparatus

A method for the manufacture of a Fresnel lens sheet is disclosed. The Fresnel lens sheet have arranged thereon a multiplicity of sawtooth-like Fresnel lenses composed of a Fresnel lens surface demonstrating a convex lens function and a rise surface located between the adjacent Fresnel lens surfaces. This sheet has a layer containing a light-diffusing material or a light-absorbing material on the rise surfaces. The method comprises the steps of, coating a photoresist on the Fresnel lens surfaces and rise surfaces, and forming the layer containing a light-diffusing material or a light-absorbing material on the rise surfaces by exposing the photoresist at mutually different light exposure doses per unit surface area on the Fresnel lens surfaces and rise surfaces.

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Tainai, Japan

Youji Ono