Kuraray Co., Ltd.

Koji Ishida

Masaru Karai

Atsushi Uchida

A diffuser plate capable of achieving excellent appearance quality when an image is projected. A transmissive diffuser plate including a microlens angle modulation distribution group provided on at least one of a light incident surface and a light emitting surface is provided. A microlens angle modulation distribution group includes a plurality of microlenses and an angle modulation part having an angle modulation distribution for angle-modulating a direction of main light emitted from each of the plurality of microlenses. When a ratio &#x3bb;/P of a wavelength &#x3bb; [&#x3bc;m] of the main light to an average arrangement period P [&#x3bc;m] of the microlens is denoted by &#x3b8; [rad], and when the direction of the main light emitted from each of the plurality of microlenses is modulated by a modulation angle &#x3b1; [rad], a ratio &#x3b1;/&#x3b8; of the modulation angle &#x3b1; to &#x3b8; satisfies 0.1&#x3c;&#x3b1;/&#x3b8;&#x3c;10.0.

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Kamisu, Japan

Koji Ishida