Light transmission sheet, rear projection type projector, light transmission sheet manufacturing device, program, and computer-readable medium
AssigneeSeiko Epson Corporation
InventorMasafumi Sakaguchi
Life of this patent
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Abstract
To eliminate ghosts caused by retroreflection of projected light and obtain high resolution images. Fine irregularities 5 are randomly formed on the plane of incidence 2a of a Fresnel lens sheet 2 with little space between them. The glossiness (Gs 60°) of the fine irregularities 5 formed by such a random pattern is equal or less than 35%. The fine irregularities 5 are in a semispherical shape, the level difference is about 10 μm, and the maximum diameter is about 50 μm. Projected light L is scattered by the fine irregularities 5 at the plane of incidence 2a, subjected to vector resolution, and has its optical intensity weakened, so that retroreflection light can be prevented.
Claims15
A light transmission sheet for use in a rear projection type projector, comprising:
- a sheet defining fine irregularities on a surface of incidence to which projected light for an image enters, a glossiness (Gs 60°) of the surface of incidence with the fine irregularities being equal to or less than 35%.
Dependencies are inferred from the claim text.