US4208676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television projection system
Assignee: Individual
•
Filing: 1978-01-17
•
Granted: 1980-06-17
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Expires: 1998-01-17
Abstract
Abstract A television projection system for producing an enlarged television image on a projection screen positionally located at a remote point from a standard television set. A tubular housing is mounted adjacent to a cathode ray tube screen of the television set. The tubular housing extends in a longitudinal direction and includes a first end having a lens tube housing displaceably movable with respect to the overall tubular housing. The lens tube housing contains a single plano-convex lens element which is utilized for enlarging the image produced from the cathode ray tube screen onto the remotely located projection screen. A switching element comprising a double throw, double pole switch is mounted on the television set and electrically coupled to the vertical deflection circuit in order to provide a vertically inverted and transversely reversed image. The inverted and reversed image is passed through the plano-convex lens where it is inverted and reversed to provide an appropriate image on the projection screen.
Inventors
- 👤 Leonard J. Berwick
- 👤 Jay I. Weiss
- 👤 Norman M. Besden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7408
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
241 words
A television projection system for producing an enlarged television image at a remote area displaced from a screen of a cathode ray tube within a television set, said screen portraying a standard image for viewing, comprising: (a) shroud means extending in a longitudinal direction having a decreasing cross-sectional area in a plane substantially normal said longitudinal direction throughout at least a portion of said longitudinal extension; said shroud means being (1) displaceable from said television set for viewing said standard image, and, (2) adjacently located with respect to said television screen for viewing said enlarged television image; (b) optical enlarging means displaceably mounted to a first end of said shroud means, said shroud means having a second end longitudinally displaced from said first end and adapted to be positionally located adjacent said cathode ray tube screen, said optical enlarging means including a single lens element for projecting said enlarged image to said remote area, said single lens element being mounted within a lens tube housing longitudinally displaceable with respect to said first end of said shroud means; and, (c) switch inversion means electrically actuatable external said television set and connected to a vertical deflection circuit of said television set having (1) a first setting for providing an image on said screen which is vertically inverted and reversed in a transverse direction to said longitudinal direction; and (2) a second setting for providing said standard image on said cathode ray tube screen.
Claim 2
Dependent Claim
241 words
A television projection system for producing an enlarged television image at a remote area displaced from a screen of a cathode ray tube within a television set, said screen portraying a standard image for viewing, comprising: (a) shroud means extending in a longitudinal direction having a decreasing cross-sectional area in a plane substantially normal said longitudinal direction throughout at least a portion of said longitudinal extension; said shroud means being (1) displaceable from said television set for viewing said standard image, and, (2) adjacently located with respect to said television screen for viewing said enlarged television image; (b) optical enlarging means displaceably mounted to a first end of said shroud means, said shroud means having a second end longitudinally displaced from said first end and adapted to be positionally located adjacent said cathode ray tube screen, said optical enlarging means including a single lens element for projecting said enlarged image to said remote area, said single lens element being mounted within a lens tube housing longitudinally displaceable with respect to said first end of said shroud means; and, (c) switch inversion means electrically actuatable external said television set and connected to a vertical deflection circuit of said television set having (1) a first setting for providing an image on said screen which is vertically inverted and reversed in a transverse direction to said longitudinal direction; and (2) a second setting for providing said standard image on said cathode ray tube screen.
Claim 3
Dependent Claim
24 words
The television projection system as recited in claim 1 where said shroud means substantially linearly decreases in said cross-sectional area in said longitudinal direction.
Claim 4
Dependent Claim
29 words
The television projection system as recited in claim 1 where said shroud means includes a roughened inner wall surface for increasing absorption of said portion of said electromagnetic spectrum.
Claim 5
Dependent Claim
24 words
The television projection system as recited in claim 2 where said shroud means includes a trapezoidal volume contour throughout said decreasing cross-sectional area portion.
Claim 6
Dependent Claim
29 words
The television projection system as recited in claim 4 where said shroud means includes a substantially black inner wall surface coating for absorbing a portion of the electromagnetic spectrum.
Claim 7
Dependent Claim
28 words
The television projection system as recited in claim 1 where said shroud means includes a substantially constant cross-sectional area portion in a plane substantially normal said longitudinal direction.
Claim 8
Dependent Claim
55 words
The television projection system as recited in claim 6 where said lens tube housing includes a tube wall dimension in said longitudinal direction of less than a predetermined length, said predetermined length providing a non-intercepting linear path from all points on said cathode ray tube screen through a substantially central point of said lens element.
Claim 9
Dependent Claim
41 words
The television projection system as recited in claim 6 where said lens tube housing includes a cross-sectional area in a plane substantially normal said longitudinal direction, said lens tube housing cross-sectional area being substantially less than said shroud means cross-sectional area.
Claim 10
Dependent Claim
20 words
The television projection system as recited in claim 8 where said lens tube housing is substantially circular in cross-sectional area.
Claim 11
Dependent Claim
30 words
The television projection system as recited in claim 9 where said lens tube housing includes a substantially black inner wall surface coating for absorbing a portion of the electromagnetic spectrum.
Claim 12
Dependent Claim
30 words
The television projection system as recited in claim 9 where said lens tube housing includes a roughened inner wall surface for increasing absorption of a portion of the electromagnetic spectrum.
Claim 13
Dependent Claim
19 words
The television projection system as recited in claim 1 where said single lens element is a plano-convex lens element.
Claim 14
Dependent Claim
21 words
The television projection system as recited in claim 12 where said plano-convex lens element includes approximately a seventeen inch focal length.
Claim 15
Dependent Claim
20 words
The television projection system as recited in claim 13 where said single lens element is formed of a plastic material.
Claim 16
Dependent Claim
17 words
The television projection system as recited in claim 14 where said single lens element is injection molded.
Claim 17
Dependent Claim
31 words
The television projection system as recited in claim 1 where said switch inversion means is electrically coupled between a vertical deflection yoke and a vertical deflection amplifier of said television set.
Claim 18
Dependent Claim
32 words
The television projection system as recited in claim 16 where said first setting of said switch inversion means provides an electrical cross-connection between said vertical deflection yoke and said vertical deflection amplifier.
Claim 19
Dependent Claim
20 words
The television projection system as recited in claim 17 where said switch inversion means is a double-pole, double-throw switch member.
Claim 20
Dependent Claim
179 words
A television projection system for providing an enlarged television image on a remotely located projection screen, comprising: (a) a tubular housing extending in a longitudinal direction having a decreasing cross-sectional area in said longitudinal direction, said tubular housing having a second end adapted to be (1) located adjacent a cathode ray tube screen of a television receiver for viewing said enlarged television image, and (2) displaceable from said cathode ray screen for viewing a standard television image; (b) a lens tube housing insertable within a first end of said tubular housing, said lens tube housing being reversibly displaceable in said longitudinal direction; (c) a single lens element secured within said lens tube housing, said single lens element for magnifying an image from said television screen in a vertically inverted and horizontally reversed manner; and, (d) switch inversion means actuatable external said television receiver and electrically connected to a vertical deflection circuit of said television receiver for vertically inverting and horizontally reversing said image from said screen of said television receiver prior to said image passage to said lens element.
Claim 21
Dependent Claim
179 words
A television projection system for providing an enlarged television image on a remotely located projection screen, comprising: (a) a tubular housing extending in a longitudinal direction having a decreasing cross-sectional area in said longitudinal direction, said tubular housing having a second end adapted to be (1) located adjacent a cathode ray tube screen of a television receiver for viewing said enlarged television image, and (2) displaceable from said cathode ray screen for viewing a standard television image; (b) a lens tube housing insertable within a first end of said tubular housing, said lens tube housing being reversibly displaceable in said longitudinal direction; (c) a single lens element secured within said lens tube housing, said single lens element for magnifying an image from said television screen in a vertically inverted and horizontally reversed manner; and, (d) switch inversion means actuatable external said television receiver and electrically connected to a vertical deflection circuit of said television receiver for vertically inverting and horizontally reversing said image from said screen of said television receiver prior to said image passage to said lens element.
Claim 22
Dependent Claim
25 words
The television projection system as recited in claim 19 where said decreasing cross-sectional area of said tubular housing is substantially linear in said longitudinal direction.
Claim 23
Dependent Claim
27 words
The television projection system as recited in claim 10 where said lens tube housing is slidably displaceable in said longitudinal direction with respect to said tubular housing.
Claim 24
Dependent Claim
34 words
The television projection system as recited in claim 21 where said lens tube housing is cylindrical in contour having a circular cross-sectional area substantially less than said decreasing cross-sectional area of said tubular housing.
Claim 25
Dependent Claim
29 words
The television projection system as recited in claim 19 where said single lens element is a plano-convex lens having a lens axis line passing substantially in said longitudinal direction.
Claim 26
Dependent Claim
25 words
The television projection system as recited in claim 23 where said single lens element includes a focal length within the approximate range of 5.0-20.0 inches.
Claim 27
Dependent Claim
21 words
The television projection system as recited in claim 24 where said single lens element includes a focal length approximating 17.0 inches.
Claim 28
Dependent Claim
20 words
The television projection system as recited in claim 23 where said single lens element is formed of a plastic material.
Claim 29
Dependent Claim
22 words
The television projection system as recited in claim 26 where said single lens element is formed of a methyl methacrylate polymer composition.
Claim 30
Dependent Claim
19 words
The television projection system as recited in claim 27 where said single lens element is formed by injection molding.
Claim 31
Dependent Claim
20 words
The television projection system as recited in claim 23 where said single lens element is formed of a glass composition.
References Cited (Backward Citations)
US2186570A
Cited
US2287307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |