Patent US5074644A successfully refreshed from Google Patents.
US5074644A
Expired / Lapsed
US
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Rear projection television
Assignee: Pioneer Corp
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Filing: 1991-01-14
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Granted: 1991-12-24
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Expires: 2011-01-14
Abstract
Abstract A rear-projection television has a transmission type two-layer screen made up of a Fresnel lens and a lenticular lens stacked together. Between the two lenses is interposed a transparent protective sheet which protects the lenses from wear or score, which would otherwise result from rubbing due to vibrations during shipping. The use of a transparent protective sheet sandwiched between the two lenses permits a series of adjustments and a final inspection on the TV to be made with the product screen mounted in the cabinet. This eliminates the need to mount a jig screen identical with the product screen in place of the latter during the adjustments, reducing the overall amount of time spent in the manufacturing process.
Inventors
- 👤 Motoharu Hirai
- 👤 Katuzi Suzuki, deceased
- 👤 Toru Yokoo
- 👤 Hideki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:15
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; G; G03; G03B; G03B21/00; G03B21/10; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
A rear projection type television set with a double-layer translucent screen, comprising: a Fresnel lens having a grooved surface; a lenticular lens having a grooved surface confronting said grooved surface of said Fresnel lens; and means for preventing contact between said Fresnel lens and said lenticular lens during vibration of said television set, wherein said means for preventing contact comprises spacer means for maintaining a gap between said lenses and a transparent sheet-like member removably disposed in said gap; and means for enabling a user of said television set to remove said transparent sheet-like member without disassembly of said television set, wherein said means for enabling comprises an opening through which said transparent sheet-like member can be pulled out by said user.
Claim 2
Dependent Claim
122 words
A rear projection type television set with a double-layer translucent screen, comprising: a Fresnel lens having a grooved surface; a lenticular lens having a grooved surface confronting said grooved surface of said Fresnel lens; and means for preventing contact between said Fresnel lens and said lenticular lens during vibration of said television set, wherein said means for preventing contact comprises spacer means for maintaining a gap between said lenses and a transparent sheet-like member removably disposed in said gap; and means for enabling a user of said television set to remove said transparent sheet-like member without disassembly of said television set, wherein said means for enabling comprises an opening through which said transparent sheet-like member can be pulled out by said user.
Claim 3
Dependent Claim
42 words
A rear projection type television set as claimed in claim 1, wherein said transparent sheet-like member is disposed between said Fresnel and said lenticular lenses with a portion of said sheet extending to the exterior of said television set through said opening.
Claim 4
Dependent Claim
24 words
A rear-projection type television set as claimed in claim 1, wherein said transparent sheet-like member is a transparent sheet made of two-axis oriented polypropylene.
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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |