Kuraray Co., Ltd.

Masashi Hirai

Masaru Karai

Atsushi Uchida

The present invention provides a diffuser plate and a method for producing a diffuser plate that can improve variations in luminance of transmitted light or reflected light in a simple structure and that enable easy design and production. The diffuser plate according to the present invention is a diffuser plate where a plurality of microlenses are placed on a principal surface, wherein a phase difference generation part is inserted between the plurality of microlenses and the principal surface, the plurality of microlenses have two or more types of lens shapes, and the number of microlenses having the two or more types of lens shapes is determined so that a quantity ratio of the two or more types of lens shapes is a specific value, each of the lens shape types is selected corresponding to each of coordinates on the principal surface in which centers of undersurfaces of the plurality of microlenses are placed, and an angle range in which the diffuse light intensity is substantially uniform is in a range of +10% to &#x2212;10% of a desired angle range.

Diffuser plate and method for producing diffuser plate

The present invention provides a method for designing a light diffusion pattern with which a light diffusion pattern to exhibit desired light diffusion properties can be designed depending on a few systematic procedures. The method includes a lens data preparation step of preparing lens data having desired light diffusion properties, a placement step of placing a plurality of lens data () prepared in the lens data preparation step in a predetermined region (), a cutting step of, when an overlap () of lenses () occurs in the placement step, cutting out a part () of a lens shape to eliminate the overlap (), and a repositioning step of replicating a shape of the cutout part () and repositioning it to another place.

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Kamisu, Japan

Masashi Hirai