US4181918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television receiver projection system
Assignee: Individual
•
Filing: 1978-04-07
•
Granted: 1980-01-01
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Expires: 1998-04-07
Abstract
Abstract An economical system for magnifying and projecting the image generated on a television receiver cathode ray tube employs a vertical deflection reversing switch to invert and laterally reverse the image, and a three element lens within a light-proof projection chamber to re-invert, magnify and project the image onto a forward projection type reflective screen. The projection chamber utilizes a white diffuse reflective surface upon its inner walls to increase the intensity of the projected image without visibly reducing the resolution of the image. The system also utilizes a cylindrical lens assembly to provide a simplified focusing arrangement.
Inventors
- 👤 Robert E. Warman
- 👤 Cortland R. Dusseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:44
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
257 words
For use in combination with a television set having a conventional cathode ray tube with an exposed face surrounded by a forwardly protruding structural flange and a base of generally rectangular configuration which is normally disposed on a support surface: a projection body comprising the substantially integral combination of a flat base member, means defining an inclined television set support surface above the flat base member and a projection enclosure having first and second longitudinally opposite open ends and disposed over a portion of the inclined support surface, one of the open ends being configured to receive and fit closely around the structural flange of the television set, and a lateral ridge on the means defining the inclined surface to receive and abut the base of the television set when placed on the inclined surface, the ridge being longitudinally spaced from the plane of the open end of the projection enclosure nearest the ridge such that the television set may be placed on the inclined surface with the face of the cathode ray tube projecting into the projection enclosure and the base abutting the ridge so as to secure the television set in the projection position without the use of fasteners, such as clamps or screws; a lens system secured within the projection enclosure for projecting an image from the cathode ray tube surface onto a remote screen; and switch means for connection with the vertical deflection plates of the cathode ray tube to invert the image of the television screen for projection through said lens system.
Claim 2
Dependent Claim
257 words
For use in combination with a television set having a conventional cathode ray tube with an exposed face surrounded by a forwardly protruding structural flange and a base of generally rectangular configuration which is normally disposed on a support surface: a projection body comprising the substantially integral combination of a flat base member, means defining an inclined television set support surface above the flat base member and a projection enclosure having first and second longitudinally opposite open ends and disposed over a portion of the inclined support surface, one of the open ends being configured to receive and fit closely around the structural flange of the television set, and a lateral ridge on the means defining the inclined surface to receive and abut the base of the television set when placed on the inclined surface, the ridge being longitudinally spaced from the plane of the open end of the projection enclosure nearest the ridge such that the television set may be placed on the inclined surface with the face of the cathode ray tube projecting into the projection enclosure and the base abutting the ridge so as to secure the television set in the projection position without the use of fasteners, such as clamps or screws; a lens system secured within the projection enclosure for projecting an image from the cathode ray tube surface onto a remote screen; and switch means for connection with the vertical deflection plates of the cathode ray tube to invert the image of the television screen for projection through said lens system.
Claim 3
Dependent Claim
23 words
Apparatus as defined in claim 1 further including a curved projection screen disposed in spaced relationship to the end of the projection enclosure.
Claim 4
Dependent Claim
29 words
Apparatus as defined in claim 1 wherein the projection enclosure is of a light interior color so as to intensify and enhance the projection of the television screen image.
References Cited (Backward Citations)
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Cited
US2119102A
Cited
US2805411A
Cited
US2512553A
Cited
US3800085A
Cited
US3949167A
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US3944734A
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US4058837A
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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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |