Fresnel lens sheet and rear projection screen
First Claim
1. A Fresnel lens sheet having a light-receiving surface on which light emitted by a light source falls, and a light-emitting surface from which the light emitted by the light source is emitted, said Fresnel lens sheet comprising:
- a plurality of prism groups, each including a plurality of prisms, each having a totally reflecting surface that reflects incident light totally toward the light-emitting surface;
wherein the light-receiving surface on the side of the light source is divided into a predetermined specific region and another region, and the prisms in the predetermined specific region have a height bigger than that of the prisms in another region.
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Accused Products
Abstract
A Fresnel lens sheet has a light-receiving surface and a light-emitting surface. The light-receiving surface is provided with a plurality of prism groups, each including a plurality of straight or circular prisms. Each of the prisms of the prism groups has a total reflection surface that reflects incident light totally toward a viewing side. The height of the prisms formed in a predetermined specific region in the light-receiving surface of the Fresnel lens sheet is bigger than that of the prisms in another region.
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Citations
13 Claims
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1. A Fresnel lens sheet having a light-receiving surface on which light emitted by a light source falls, and a light-emitting surface from which the light emitted by the light source is emitted, said Fresnel lens sheet comprising:
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a plurality of prism groups, each including a plurality of prisms, each having a totally reflecting surface that reflects incident light totally toward the light-emitting surface;
wherein the light-receiving surface on the side of the light source is divided into a predetermined specific region and another region, and the prisms in the predetermined specific region have a height bigger than that of the prisms in another region. - View Dependent Claims (2, 4, 5, 6, 7, 8, 10)
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3. A Fresnel lens sheet having a light-receiving surface on which light emitted by a light source falls, and a light-emitting surface from which the light emitted by the light source is emitted, said Fresnel lens sheet comprising:
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a plurality of prism groups, each including a plurality of prisms, each having a totally reflecting surface that reflects incident light totally toward the light-emitting surface;
wherein the light-receiving surface on the side of the light source is divided into a predetermined specific region and another region, and the prisms in the predetermined specific region have a width smaller than that of the prisms in another region. - View Dependent Claims (9)
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11. A rear projection screen comprising a Fresnel lens sheet having a light-receiving surface on which light emitted by a light source falls, and a light-emitting surface from which the light emitted by the light source is emitted;
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wherein a plurality of prism groups, each including a plurality of prisms, each having a totally reflecting surface that reflects incident light totally toward the light-emitting surface are formed in the light-receiving surface, the light-receiving surface on the side of the light source is divided into a predetermined specific region and another region, and the prisms in the predetermined specific region have a height bigger than that of the prisms in another region. - View Dependent Claims (13)
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12. A rear projection screen comprising a Fresnel lens sheet having a light-receiving surface on which light emitted by a light source falls, and a light-emitting surface from which the light emitted by the light source is emitted;
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wherein a plurality of prism groups, each including a plurality of prisms each having a totally reflecting surface that reflects incident light totally toward the light-emitting surface are formed in the light-receiving surface, the light-receiving surface on the side of the light source is divided into a predetermined specific region and another region, and the prisms in the predetermined specific region have a width smaller than that of the prisms in another region.
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Specification