Transmission type projection screen
First Claim
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1. A transmission type projection screen having a single or a plurality of lens sheets for condensing and diffusing light, comprising:
- lens sheet means having a front side directed to a viewer and a rear side directed to a light source;
a plurality of lenses provided on the rear surface of said lens sheet means at mutually spaced relation along said rear surface, said lenses condensing, on said front side, light received from the light source such that said front side will have dim parts which do not receive the light condensed by said lenses and bright parts which do receive the light condensed by said lenses;
at least one adhesive layer contacting said front side of said lens sheet means only at said dim parts; and
a continuous transparent protective film attached to said front side of said lens sheet means via only said at least one adhesive layer,whereby air-gaps are formed between said bright parts and said transparent protective film.
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Abstract
A transmission type projection screen is provided with a transparent film attached adhesively to only opaque or shading parts formed on top surfaces of ridges provided on the front surface of a lens sheet. The lens sheet is provided on its rear surface with a plurality of lenses for condensing light projected by a light source. The shading parts do not receive the light condensed by the plurality of lenses. The film protects the front surface of the lens sheet of the screen, and prevents scattering of the lens sheet in fragments when the lens sheet is cracked.
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Citations
16 Claims
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1. A transmission type projection screen having a single or a plurality of lens sheets for condensing and diffusing light, comprising:
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lens sheet means having a front side directed to a viewer and a rear side directed to a light source; a plurality of lenses provided on the rear surface of said lens sheet means at mutually spaced relation along said rear surface, said lenses condensing, on said front side, light received from the light source such that said front side will have dim parts which do not receive the light condensed by said lenses and bright parts which do receive the light condensed by said lenses; at least one adhesive layer contacting said front side of said lens sheet means only at said dim parts; and a continuous transparent protective film attached to said front side of said lens sheet means via only said at least one adhesive layer, whereby air-gaps are formed between said bright parts and said transparent protective film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification