US3705757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear projection screen
Assignee: Polacoat Inc
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Filing: 1971-04-05
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Granted: 1972-12-12
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Expires: 1991-04-05
Abstract
Abstract A rear projection screen which is essentially free from scintillation, said screen being composed of two essentially parallel screen surfaces lying in closely spaced apart relation, one of said surfaces comprising a refraction lens system composed of lens defining transparent articles contained in a plastic carrier coating, the other surface of said screen comprising either a second refractive lens system or a light transmissive matte surface which acts as a refractive system, said systems each acting to disperse light passing therethrough at different wave lengths to individually produce scintillation effects, said two systems jointly acting to counterbalance their respective scintillation effects to provide a screen which is essentially free from scintillation.
Inventors
- 👤 Douglas B Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:39
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; Y; Y10; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A rear projection screen comprising a pair of essentially parallel light transmissive screen surfaces lying in closely spaced apart relation, each of said surfaces comprising a refractive system acting to disperse light passing therethrough at different wave lengths and individually acting to produce scintillation effects, said two systems jointly acting to counterbalance their respective scintillation effects to provide a screen which is essentially free from scintillation, at least one of said refractive systems comprises a plastic carrier layer containing lens defining particles, said system having a refractive index of from about 1.43 to about 1.60.
Claim 2
Dependent Claim
95 words
A rear projection screen comprising a pair of essentially parallel light transmissive screen surfaces lying in closely spaced apart relation, each of said surfaces comprising a refractive system acting to disperse light passing therethrough at different wave lengths and individually acting to produce scintillation effects, said two systems jointly acting to counterbalance their respective scintillation effects to provide a screen which is essentially free from scintillation, at least one of said refractive systems comprises a plastic carrier layer containing lens defining particles, said system having a refractive index of from about 1.43 to about 1.60.
Claim 3
Dependent Claim
20 words
The screen claimed in claim 1 wherein both of said refractive systems comprise plastic carrier layers containing lens defining particles.
Claim 4
Dependent Claim
35 words
The screen claimed in claim 2 wherein said refractive systems are spaced apart by a distance of from about .015 to about .125 inch, the distance decreasing as the refractive index of the systems increases.
Claim 5
Dependent Claim
29 words
The screen claimed in claim 3 wherein said refractive systems are formed on the opposite surfaces of a transparent sheet which serves as a spacer for the refractive systems.
Claim 6
Dependent Claim
37 words
The screen claimed in claim 3 wherein said refractive systems are each formed on a separate transparent sheet which are juxtaposed with the refractive systems facing each other and the sheets spaced apart by an interposed mask.
Claim 7
Dependent Claim
26 words
The screen claimed in claim 1 wherein the other of said refractive systems comprises a matte surface having from about 75 to 80 percent light transmission.
Claim 8
Dependent Claim
40 words
The screen claimed in claim 6 wherein said refractive systems are spaced apart by a distance of from about 0.010 to about 0.125 inch, the distance decreasing as the refractive index of the system containing the lens defining particles increases.
Claim 9
Dependent Claim
29 words
The screen claimed in claim 7 wherein said refractive systems are formed on the opposite surfaces of a transparent sheet which serves as a spacer for the said systems.
Claim 10
Dependent Claim
96 words
A rear projection screen comprising an opposing pair of essentially parallel light transmissive screen surfaces spaced apart by a distance of from about 0.015 inch to about 0.125 inch, each of said screen surfaces comprising a refractive system composed of a plastic carrier layeR having a thickness of from about 0.0025 to about 0.005 inch and containing lens defining particles having a particle size of from about 5 to about 40 microns, said systems having a refractive index of from about 1.43 to about 1.60, the spacing between said systems varying inversely with their refractive index.
Claim 11
Dependent Claim
96 words
A rear projection screen comprising an opposing pair of essentially parallel light transmissive screen surfaces spaced apart by a distance of from about 0.015 inch to about 0.125 inch, each of said screen surfaces comprising a refractive system composed of a plastic carrier layeR having a thickness of from about 0.0025 to about 0.005 inch and containing lens defining particles having a particle size of from about 5 to about 40 microns, said systems having a refractive index of from about 1.43 to about 1.60, the spacing between said systems varying inversely with their refractive index.
Claim 12
Dependent Claim
132 words
A rear projection screen comprising a transparent opposing pair of essentially parallel light transmissive screen surfaces spaced apart by a distance of from about 0.010 inch to about 0.125 inch, one of said screen surfaces comprising a refractive system composed of a plastic carrier layer having a thickness of from about 0.0025 to about 0.005 inch and containing lens defining particles having a particle size of from about 5 to about 40 microns, said system having a refractive index of from about 1.43 to about 1.60, the other of said systems comprising a matte surface having from about 75 percent to about 80 percent light transmission, the spacing between sand systems as determined by the thickness of said transparent sheet varying inversely with the refractive index of said first named refractive system.
Claim 13
Dependent Claim
132 words
A rear projection screen comprising a transparent opposing pair of essentially parallel light transmissive screen surfaces spaced apart by a distance of from about 0.010 inch to about 0.125 inch, one of said screen surfaces comprising a refractive system composed of a plastic carrier layer having a thickness of from about 0.0025 to about 0.005 inch and containing lens defining particles having a particle size of from about 5 to about 40 microns, said system having a refractive index of from about 1.43 to about 1.60, the other of said systems comprising a matte surface having from about 75 percent to about 80 percent light transmission, the spacing between sand systems as determined by the thickness of said transparent sheet varying inversely with the refractive index of said first named refractive system.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |