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US 3,996,051 AGranted
Controlled angle viewing screens by interference techniques
AssigneeRCA Corporation
InventorDietrich Meyerhofer
Life of this patent
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Abstract
A rear projection viewing screen combining high efficiency and uniformity of illumination with predetermined scattering characteristics is constructed through interference techniques. The viewing screen functions as a combination lens and appropriate diffuser.
Claims7
A method for producing a controlled angle viewing screen by interference techniques, said method comprising the step of:
- exposing a hardened, sensitized gelatin film with incident light which has been passed through an area of a diffusing medium having a given linear dimension which medium is located at a given distance from said film such that said given linear dimension subtends a preselected angle in the range of 15.degree. to 40.degree. on said film, said incident light being coherent to the extent that all the light impinging on any given point of said film has a substantially fixed phase relationship.
Dependencies are inferred from the claim text.