US4053208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear projection screens
Assignee: Fujifilm Holdings Corp
•
Filing: 1976-02-03
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Granted: 1977-10-11
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Expires: 1996-02-03
Abstract
Abstract A rear projection screen produced by providing surface irregularity directly on at least one side of a light diffusion layer containing at least one light scattering material selected from the group consisting of one or more waxes, one or more crystalline polymers or a mixture thereof.
Inventors
- 👤 Hisatoyo Kato
- 👤 Junji Miyahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
42 words
A rear projection screen comprising a diffusion layer containing at least one light scattering material selected from the group consisting of wax and crystalline polymers wherein a micro-optical surface irregularity is provided directly on at least one side of said diffusion layer.
Claim 2
Dependent Claim
42 words
A rear projection screen comprising a diffusion layer containing at least one light scattering material selected from the group consisting of wax and crystalline polymers wherein a micro-optical surface irregularity is provided directly on at least one side of said diffusion layer.
Claim 3
Dependent Claim
23 words
The rear projection screen according to claim 1, wherein the wax is selected from the group consisting of natural wax, and petroleum wax.
Claim 4
Dependent Claim
30 words
The rear projection screen according to claim 1, wherein the crystalline polymer is selected from the group consisting of polyolefins, polystyrenes, polycarbonates, polyesters, polyamides, polyurethanes, polyvinyl alcohols, esters, and ethers.
Claim 5
Dependent Claim
21 words
The rear projection screen according to claim 1, wherein the diffusion layer composed of wax further contains a wax reforming agent.
Claim 6
Dependent Claim
25 words
The rear projection screen according to claim 4, wherein the wax reforming agent is selected from the group consisting of natural resins and synthetic resins.
Claim 7
Dependent Claim
30 words
The rear projection screen according to claim 4, wherein the wax reforming agent is selected from the group consisting of an ethylene-vinyl acetate copolymer, polyisobutylene, polybutene, rosin, and atactic polypropylene.
Claim 8
Dependent Claim
33 words
The rear projection screen according to claim 4, wherein the wax reforming agent is added in an amount of 0.1 to 20% by weight of the total weight of the wax and additives.
Claim 9
Dependent Claim
17 words
The rear projection screen according to claim 1, wherein the surface irregularity comprises a micro-optical element structure.
Claim 10
Dependent Claim
26 words
The rear projection screen according to claim 8, wherein the size of each micro-optical element as a pitch ranges between about 0.05 and about 2 mm.
Claim 11
Dependent Claim
17 words
The rear projection screen according to claim 8, wherein the surface irregularity is a Fresnel lens structure.
Claim 12
Dependent Claim
17 words
The rear projection screen according to claim 8, wherein the surface irregularity is a lenticular lens structure.
Claim 13
Dependent Claim
17 words
The rear projection screen according to claim 8, wherein the surface irregularity is a V groove structure.
Claim 14
Dependent Claim
33 words
The rear projection screen according to claim 1, wherein a Fresnel lens structure is provided on one side of the diffusion layer and a lenticular lens structure is provided on the other side.
Claim 15
Dependent Claim
18 words
The rear projection screen according to claim 1, wherein the diffusion layer is bonded to a transparent support.
Claim 16
Dependent Claim
17 words
The rear projection screen according to claim 14, wherein the transparent support is an acrylic resin plate.
Claim 17
Dependent Claim
15 words
The rear projection screen according to claim 1, wherein the wax is a synthetic wax.
Claim 18
Dependent Claim
36 words
The rear projection screen according to claim 16, wherein the molecular weight of the synthetic wax is not more than about 5,000, and the melt index of the synthetic wax is not less than about 1,000.
Claim 19
Dependent Claim
23 words
The rear projection screen according to claim 1, wherein the thickness of the diffusion plate ranges between about 0.1 mm and 10 mm.
Claim 20
Dependent Claim
22 words
The rear projection screen according to claim 16, wherein the thickness of the diffusion plate ranges between 0.1 mm and 10 mm.
Claim 21
Dependent Claim
18 words
The rear projection screen according to claim 8 wherein the surface irregularity consists essentially of a micro-optical element.
Claim 22
Dependent Claim
17 words
The rear projection screen according to claim 8 wherein the surface irregularity consists of a micro-optical element.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |