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US 4,232,939 AGranted
Screen with high luminance and wide angle
OwnerTomoo Kikuchiinventor
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OwnerTomoo Kikuchiinventor
Estimating the term…
This invention relates to a reflector type screen suitable for use in a daylight room and which provides high luminance and a wide range of diffusion, wherein a specular surface is provided by an aluminum coating formed by vacuum evaporation on one side of a base plate of a transparent thermoplastic resin, and said specular surface is lined with a thin sheet of a flexible synthetic resin such as polyvinyl chloride thereby to protect the specular surface and to facilitate the subsequent processing. A transparent diffusing specular layer having a sandblast surface is formed on the other side of the base plate, and then lenticulars having a convex surface are formed in continuous rows by rolling with due caution not to damage the sandblast surface. The diffusing layer is prepared to have relatively low diffusing performance, e.g. 10 to 20%, thereby providing high luminance for viewers and a wide range of diffusion in the transverse direction.
A screen with high luminance and wide diffusing performance which comprises:
The method of forming a screen with wide diffusing performance which comprises providing a transparent thermoplastic resin sheet, vacuum evaporating a specular surface on one side of the resin sheet, forming lenticulars having convex surfaces in continuous vertical rows of the other side of the resin sheet and forming a diffusing layer of low diffusing performance on the convex surfaces of the lenticulars.
The method of using a screen with high luminance and wide diffusing performance which comprises projecting light from a source through a diffusing layer of low diffusing performance and partially reflecting the light by the diffusing layer, passing the light which passes through the diffusing layer through convex lenticular surfaces arranged in continuous vertical rows, redirecting the light with the lenticular surfaces, passing the redirected light to a thermoplastic resin sheet having a specular surface formed by vacuum evaporation on a side thereof opposite the convex lenticular surfaces, reflecting the light from a sheet through the continuous lenticular surfaces and through the diffusing layer and diffusing a part of the reflected light by the diffusion layer.
Dependencies are inferred from the claim text.