US5803567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection-type display device
Assignee: Sony Corp
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Filing: 1996-10-18
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Granted: 1998-09-08
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Expires: 2016-10-18
Abstract
Abstract A projection-type display device includes an image projector and a screen, in which image projector is for projecting image light rays and the screen is disposed on a side to which the image light rays are projected from the image projector. The screen is formed of a Fresnel lens sheet with one side thereof facing the image projector and a lenticular sheet disposed on the other side of the Fresnel lens sheet for transmitting the image light rays that are formed into a picture on the screen. The Fresnel lens sheet has a fixed focal length in a region from the center of the Fresnel lens sheet to a prescribed distance and focal lengths gradually decreasing toward the outer periphery of the Fresnel lens sheet in a region exceeding the prescribed distance.
Inventors
- 👤 Yasuaki Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7408; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
123 words
A projection-type display device comprising: an image projector for projecting image light rays; and a screen being disposed on a side of said image projector to which said image light rays are projected and including a Fresnel lens sheet with one side thereof facing said image projector and a lenticular sheet disposed on the other side of said Fresnel lens sheet for transmitting said image light rays that are formed into a picture on said screen, wherein said Fresnel lens sheet has a fixed local length in a region extending a predetermined distance from a center of said Fresnel lens sheet and having focal lengths gradually decreasing toward the outer periphery of said Fresnel lens sheet in a region exceeding said predetermined distance.
Claim 2
Dependent Claim
123 words
A projection-type display device comprising: an image projector for projecting image light rays; and a screen being disposed on a side of said image projector to which said image light rays are projected and including a Fresnel lens sheet with one side thereof facing said image projector and a lenticular sheet disposed on the other side of said Fresnel lens sheet for transmitting said image light rays that are formed into a picture on said screen, wherein said Fresnel lens sheet has a fixed local length in a region extending a predetermined distance from a center of said Fresnel lens sheet and having focal lengths gradually decreasing toward the outer periphery of said Fresnel lens sheet in a region exceeding said predetermined distance.
Claim 3
Dependent Claim
69 words
A projection-type display device according to claim 1, wherein said predetermined distance is at least one of a distance from said center of said Fresnel lens sheet to a point corresponding to an upper edge of a projected image on said Fresnel lens sheet and a distance from said center of said Fresnel lens sheet to a point corresponding to a lower edge of said picture on said screen.
Claim 4
Dependent Claim
21 words
A projection-type display device according to claim 1, wherein said lenticular sheet includes vertical black stripes formed thereon at prescribed intervals.
Claim 5
Dependent Claim
95 words
A projection-type display device comprising: an image projector for projecting image light rays; and a screen being disposed on a side of said image projector to which said image light rays are projected and including a Fresnel lens sheet with one side thereof facing said image projector and a lenticular sheet disposed on the other side of said Fresnel lens sheet for transmitting said image light rays into a picture on said screen, wherein said Fresnel lens sheet has focal lengths gradually decreasing from a center of said lens sheet toward an outer periphery thereof.
Claim 6
Dependent Claim
95 words
A projection-type display device comprising: an image projector for projecting image light rays; and a screen being disposed on a side of said image projector to which said image light rays are projected and including a Fresnel lens sheet with one side thereof facing said image projector and a lenticular sheet disposed on the other side of said Fresnel lens sheet for transmitting said image light rays into a picture on said screen, wherein said Fresnel lens sheet has focal lengths gradually decreasing from a center of said lens sheet toward an outer periphery thereof.
Claim 7
Dependent Claim
21 words
A projection-type display device according to claim 4, wherein said lenticular sheet includes vertical black stripes formed thereon at prescribed intervals.
Claim 8
Dependent Claim
91 words
A projection apparatus comprising: a housing; a screen including a Fresnel lens sheet and a lenticular sheet and being disposed at a front of said housing; a reflector disposed inside said housing at a rear portion thereof; an image source; and a projection lens, wherein said Fresnel lens sheet has a fixed focal length in a region extending from a center of said Fresnel lens sheet to a predetermined distance and focal lengths gradually decreasing toward an outer periphery of said Fresnel lens sheet in a region exceeding said predetermined distance.
Claim 9
Dependent Claim
91 words
A projection apparatus comprising: a housing; a screen including a Fresnel lens sheet and a lenticular sheet and being disposed at a front of said housing; a reflector disposed inside said housing at a rear portion thereof; an image source; and a projection lens, wherein said Fresnel lens sheet has a fixed focal length in a region extending from a center of said Fresnel lens sheet to a predetermined distance and focal lengths gradually decreasing toward an outer periphery of said Fresnel lens sheet in a region exceeding said predetermined distance.
Claim 10
Dependent Claim
71 words
A projection apparatus according to claim 6, wherein said predetermined distance is at least one of a distance from said center of said Fresnel lens sheet to a point corresponding to an upper edge of a projected image on said Fresnel lens sheet and a distance from said center of said Fresnel lens sheet to a point corresponding to a lower edge of said projected image on said Fresnel lens sheet.
Claim 11
Dependent Claim
16 words
A projection apparatus according to claim 6, wherein said image source comprises a cathode ray tube.
Claim 12
Dependent Claim
29 words
A projection apparatus according to claim 6, wherein said image source comprises three cathode ray tubes respectively corresponding to a red signal, a green signal and a blue signal.
Claim 13
Dependent Claim
16 words
A projection apparatus according to claim 6, wherein said image source comprises a liquid crystal panel.
Claim 14
Dependent Claim
29 words
A projection apparatus according to claim 6, wherein said image source comprises three liquid crystal panels respectively corresponding to a red signal, a green signal and a blue signal.
Claim 15
Dependent Claim
20 words
A projection apparatus according to claim 6, wherein said lenticular sheet includes vertical black stripes formed thereon at prescribed intervals.
Claim 16
Dependent Claim
66 words
A projection apparatus comprising: a housing; a screen including a Fresnel lens sheet and a lenticular sheet and being disposed at a front of said housing; a reflector disposed inside said housing at a rear portion thereof; an image source; and a projection lens, wherein said Fresnel lens sheet has focal lengths gradually decreasing from a center of said lens sheet toward an outer periphery thereof.
Claim 17
Dependent Claim
66 words
A projection apparatus comprising: a housing; a screen including a Fresnel lens sheet and a lenticular sheet and being disposed at a front of said housing; a reflector disposed inside said housing at a rear portion thereof; an image source; and a projection lens, wherein said Fresnel lens sheet has focal lengths gradually decreasing from a center of said lens sheet toward an outer periphery thereof.
Claim 18
Dependent Claim
16 words
A projection apparatus according to claim 13, wherein said image source comprises a cathode ray tube.
Claim 19
Dependent Claim
29 words
A projection apparatus according to claim 13, wherein said image source comprises three cathode ray tube respectively corresponding to a red signal, a green signal and a blue signal.
Claim 20
Dependent Claim
16 words
A projection apparatus according to claim 13, wherein said image source comprises a liquid crystal panel.
Claim 21
Dependent Claim
29 words
A projection apparatus according to claim 13, wherein said image source comprises three liquid crystal panels respectively corresponding to a red signal, a green signal and a blue signal.
Claim 22
Dependent Claim
20 words
A projection apparatus according to claim 13, wherein said lenticular sheet includes vertical black stripes formed thereon at prescribed intervals.
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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) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |