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AssigneeDai Nippon Printing Co., Ltd.
InventorsMasanori Umeya, Masachika Watanabe, Minoru Azakami
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The present invention provides an optical diffusion device, which can exhibit discontinuously different optical properties only in desired regions without creating any difference in grades and/or breaks, facilitate control of the optical diffusion properties, and prevent the occurrence of the stray light, as well as provides a projection screen and a design member, both using the optical diffusion device. An exemplary optical diffusion device according to this invention includes a base, and a cholesteric liquid crystal polymer layer provided on the base and composed of a plurality of diffusion regions arranged on a plane. A diffusion angle of one of the diffusion regions (e.g., first diffusion regions) of the cholesteric liquid crystal polymer layer is different from a diffusion angle of another of the diffusion regions (e.g., second diffusion regions).
An optical diffusion device, comprising:
A projection screen including an optical diffusion device,
A design member including an optical diffusion device,
A security medium including an optical diffusion device,
Dependencies are inferred from the claim text.