US4927233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear projection screen
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-03-06
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Granted: 1990-05-22
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Expires: 2009-03-06
Abstract
Abstract A screen medium of a rear projection screen is formed on its incidence surface with lenticular lenses, and on its viewing surface with lenticular lenses in light focusing area and with grooves and ridges in no-light focusing areas. Each of the grooves is bordered by the ridges and filled therein a ink so as to form an ambient light absorbing layer.
Inventors
- 👤 Yasuaki Nakanishi
- 👤 Masao Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:02
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
In a rear projection screen having an incidence surface upon which projection light rays impinge, and a viewing surface on which a projected image is visible, comprising lenticular lenses formed on said incidence surface for focusing the projection light rays on said viewing surface within light focusing areas other than no-light focusing areas, lenticular lenses formed on said viewing surface in said light focusing areas; and ambient light absorbing layers formed on said viewing surface in said no-light focusing areas, the improvement wherein each of said no-light focusing areas is formed therein with an ink filling groove and has ridges on both sides of the groove, each of said ridges having top edge, ink is filled in said groove in each no-light focusing area so as to form each of said ambient light absorbing layers having both side edges reaching the top edges of said ridges, whereby the both side edges of each of said light absorbing layers define straight border lines extending therealong.
Claim 2
Dependent Claim
164 words
In a rear projection screen having an incidence surface upon which projection light rays impinge, and a viewing surface on which a projected image is visible, comprising lenticular lenses formed on said incidence surface for focusing the projection light rays on said viewing surface within light focusing areas other than no-light focusing areas, lenticular lenses formed on said viewing surface in said light focusing areas; and ambient light absorbing layers formed on said viewing surface in said no-light focusing areas, the improvement wherein each of said no-light focusing areas is formed therein with an ink filling groove and has ridges on both sides of the groove, each of said ridges having top edge, ink is filled in said groove in each no-light focusing area so as to form each of said ambient light absorbing layers having both side edges reaching the top edges of said ridges, whereby the both side edges of each of said light absorbing layers define straight border lines extending therealong.
Claim 3
Dependent Claim
18 words
A rear projection screen claimed in claim 1, wherein each of said ridges has a flat top surface.
Claim 4
Dependent Claim
19 words
A rear projection screen claimed in claim 1, wherein each of said ridges has a lens shaped top surface.
Claim 5
Dependent Claim
18 words
A rear projection screen claimed in claim 1, wherein each of said ridges has a cylindrical top surface.
Claim 6
Dependent Claim
19 words
A rear projection screen claimed in claim 1, wherein each of said ridges has a triangular shape top surface.
Claim 7
Dependent Claim
22 words
A rear projection screen claimed in claim 1, wherein said lenticular lenses on said viewing surface are composed of mat finished surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |