US4361382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Translucent projection screen for rear-type image projection system and process for fabricating the same
Assignee: Panasonic Holdings Corp
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Filing: 1981-01-22
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Granted: 1982-11-30
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Expires: 2001-01-22
Abstract
Abstract A translucent projection screen for a rear-type image projection system comprising a flat plate or sheet of transparent resin into which are uniformly dispersed or distributed spherical glass beads, which are light diffusing materials. Such screen as described above is fabricated by dispersing or distributing spherical glass beads into a transparent resin, extruding and cutting the resin into pellets and forming these pellets into a flat plate or sheet by compression molding. A translucent projection screen having a Fresnel lens surface and a lenticular lens surface can be also molded by one step.
Inventors
- 👤 Keisuke Miyoshi
- 👤 Kenshiro Sumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:23
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A translucent projection screen for a rear-type image projection system comprising a flat plate or sheet of a transparent resin having spherical glass beads uniformly dispersed therein as light diffusing materials.
Claim 2
Dependent Claim
31 words
A translucent projection screen for a rear-type image projection system comprising a flat plate or sheet of a transparent resin having spherical glass beads uniformly dispersed therein as light diffusing materials.
Claim 3
Dependent Claim
23 words
A translucent projection screen for a rear-type image projection system as set forth in claim 1 wherein said resin is an acrylic resin.
Claim 4
Dependent Claim
28 words
A translucent projection screen for a rear-type image projection system as set forth in claim 1 wherein said glass beads are from 5 to 63 microns in diameter.
Claim 5
Dependent Claim
55 words
A process for fabricating translucent projection screens for rear-type image projection system characterized by dispersing spherical glass beads, which are light diffusing materials, into a transparent resin, extruding said resin and cutting the extruded resin into pellets, and placing a plurality of pellets in a mold and compressing them into a flat plate or sheet.
Claim 6
Dependent Claim
55 words
A process for fabricating translucent projection screens for rear-type image projection system characterized by dispersing spherical glass beads, which are light diffusing materials, into a transparent resin, extruding said resin and cutting the extruded resin into pellets, and placing a plurality of pellets in a mold and compressing them into a flat plate or sheet.
Claim 7
Dependent Claim
15 words
A process as set forth in claim 4 wherein said resin is an acrylic resin.
Claim 8
Dependent Claim
21 words
A process as set forth in claim 4 wherein said spherical glass beads are from 5 to 63 microns in diameter.
Claim 9
Dependent Claim
71 words
A process as set forth in claim 4 wherein the upper and lower mold halves for compression molding of said glass bead containing resin are formed with a pattern of a Fresnel lens and a pattern of a lenticular lens, respectively, so that one surface of the molded translucent projection screen is in the form of a Fresnel lens and the other surface is in the form of a lenticular lens.
Claim 10
Dependent Claim
13 words
A product prepared by the process of claim 4, 5, 6, or 7.
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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |