US3800085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible direct viewing/projection t-v system
Assignee: MARIA W DE
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Filing: 1972-10-20
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Granted: 1974-03-26
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Expires: 1992-10-20
Abstract
Abstract A converter attachable to a standard television set whereby the set, when the converter is disconnected, may be directly viewed in the usual manner, but when the converter is operating, functions to produce a properly-oriented bright image in an enlarged scale on a remote screen. The converter consists of an optical accessory mountable over the front face of the set and an inverting switch connected to the vertical deflection circuit of the set. The optical accessory includes a housing that masks the face of the cathode ray display tube, the housing containing a high-speed objective. The objective is constituted by a field flattener lens fixedly positioned adjacent the outwardly curved face of the cathode ray tube and serving optically to flatten the curved field on the cathode ray screen, and a movable lens barrel for projecting the flattened image field onto a remote screen. The barrel is axially shiftable relative to the field flattener lens for purpose of focusing the projected image at various distances for different screen dimensions. An inverting switch, when activated, causes the luminous image appearing on the cathode ray screen to invert and to be reversed whereby the image projected on the remote screen is properly erected.
Inventors
- 👤 T Shannon
- 👤 Maria W De
- 👤 M Ambats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:44
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7408; G; G02; G02B; G02B13/00; G02B13/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
222 words
A converter for transforming a standard direct view television receiver into a video theatre, said receiver including a cathode ray display tube provided with a vertical deflection yoke and a vertical deflection amplifier for supplying a scanning voltage to said yoke, said converter comprising: A. a demountable accessory enclosed in a housing attachable to the front face of the receiver to mask the face of The tube, said accessory including an objective that substantially covers the field of view to project an enlarged image onto a remote screen whose effective area is several times larger than that of the tube, said objective having lens elements optically forming an inverted image, and B. an image inverting switch interposable in the vertical deflection circuit of said receiver between said vertical deflection yoke and said vertical deflection amplifier thereof, said switch in one position supplying said scanning voltage to said yoke in the same polarity as in the absence of said switch to provide a normal image on said cathode ray tube for direct viewing, said switch in a second position reversing the polarity of said scanning voltage to provide an image on said tube which is upside down and reversed from left to right whereby as a result of the optical inversion introduced by said objective, the image on said screen is properly erected.
Claim 2
Dependent Claim
222 words
A converter for transforming a standard direct view television receiver into a video theatre, said receiver including a cathode ray display tube provided with a vertical deflection yoke and a vertical deflection amplifier for supplying a scanning voltage to said yoke, said converter comprising: A. a demountable accessory enclosed in a housing attachable to the front face of the receiver to mask the face of The tube, said accessory including an objective that substantially covers the field of view to project an enlarged image onto a remote screen whose effective area is several times larger than that of the tube, said objective having lens elements optically forming an inverted image, and B. an image inverting switch interposable in the vertical deflection circuit of said receiver between said vertical deflection yoke and said vertical deflection amplifier thereof, said switch in one position supplying said scanning voltage to said yoke in the same polarity as in the absence of said switch to provide a normal image on said cathode ray tube for direct viewing, said switch in a second position reversing the polarity of said scanning voltage to provide an image on said tube which is upside down and reversed from left to right whereby as a result of the optical inversion introduced by said objective, the image on said screen is properly erected.
Claim 3
Dependent Claim
28 words
A converter as set forth in claim 1, wherein said remote screen is aluminized and has a slight concavity to optimize screen brightness in high ambient light conditions.
Claim 4
Dependent Claim
30 words
A converter as set forth in claim 1, wherein said objective is a high-speed objective whose f-number is at least about f: 1.5 and having a substantial field of view.
Claim 5
Dependent Claim
17 words
A converter as set forth in claim 1, wherein said inverter switch is a double-pole, double-throw switch.
Claim 6
Dependent Claim
81 words
A converter as set forth in claim 1, wherein the face of said cathode ray tube produces an outwardly curved field and said objective includes a field flattener lens fixedly disposed at the rear end of said housing and adjacent said face, said field flattener lens being adapted optically to correct for the curved field, said objective including a lens assembly which is axially shiftable within said housing relative to said field flattener lens to focus the image onto said screen.
Claim 7
Dependent Claim
22 words
A converter as set forth in claim 5, wherein said lens assembly includes an anamorphic lens to provide a wide screen presentation.
Claim 8
Dependent Claim
32 words
A converter as set forth in claim 5, wherein said objective is constituted by lens elements fabricated of plastic material having optical properties and a light permeability which exceeds that of glass.
Claim 9
Dependent Claim
158 words
A projection television system comprising: A. a television receiver including a cathode-ray display tube having a vertical deflection yoke and a vertical deflection amplifier for supplying a scanning current to said yoke to produce an image on said tube which is upside down and reversed from left to right, and B. an optical accessory attached to the front face of the receiver to mask the face of the tube, said accessory including an objective that substantially covers the field of view to project an enlarged image onto a remote screen whose effective area is several times larger than that of the tube, said objective having optical elements forming an inverted image whereby as a result of the optical inversion introduced by said objective, the image on said screen is properly erected, said objective having a high-speed whose f-number is at least about f: 1.5 and being formed of a plastic material whose light permeability exceeds that of glass.
Claim 10
Dependent Claim
158 words
A projection television system comprising: A. a television receiver including a cathode-ray display tube having a vertical deflection yoke and a vertical deflection amplifier for supplying a scanning current to said yoke to produce an image on said tube which is upside down and reversed from left to right, and B. an optical accessory attached to the front face of the receiver to mask the face of the tube, said accessory including an objective that substantially covers the field of view to project an enlarged image onto a remote screen whose effective area is several times larger than that of the tube, said objective having optical elements forming an inverted image whereby as a result of the optical inversion introduced by said objective, the image on said screen is properly erected, said objective having a high-speed whose f-number is at least about f: 1.5 and being formed of a plastic material whose light permeability exceeds that of glass.
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |