Kuraray Co., Ltd.

Kazunori Hirose

Ichiro Matsuzaki

Etsuo Nakazato

Makoto Toyohara

Yoshihiro Oda

Kazuo Baba

The present invention aims at providing a manufacturing method for an optical sheet capable of manufacturing a thin optical sheet of a uniform thickness distribution with a high thickness accuracy, and high shaping/transferring performances, and an optical sheet manufactured by using the manufacturing method. A manufacturing method for an optical sheet according to the present invention includes passing a resin discharged from a die between a touch roll and a shaping roll under pressure.

Method for producing optical sheet

A Fresnel lens sheet which is bright due to a small light quantity loss, is restricted in speckles and ghosts, does not produce moires, and can be used in an inexpensive transmitting screen, wherein the sheet satisfies the diffusion characteristics of the following expressions (1) and (2), or the following expressions (3), (4) and (5). &#x3b3;/&#x3b1;&#x2266;2.8 (1) &#x3b6;/&#x3b1;&#x2266;6 (2), where &#x3b1; is viewing half value angle, &#x3b3; viewing 1/10 value angle, and &#x3b6; viewing 1/100 value angle. 2.0&#xb0;&#x2266;&#x3b1;&#x2266;5.5&#xb0; (3), where &#x3b1; is viewing half value angle, &#x3b3;&#x2266;12&#xb0; (4), where &#x3b3; is viewing 1/10 value angle, &#x3b6;&#x2266;18&#xb0; (5), where &#x3b6; is viewing 1/100 value angle.

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Niigata, Japan

Kazunori Hirose