Patent US4717248A successfully refreshed from Google Patents.
US4717248A
Expired / Lapsed
US
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Display system
Assignee: Individual
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Filing: 1985-10-03
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Granted: 1988-01-05
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Expires: 2005-10-03
Abstract
Abstract This system is designed for video displays that are used for television presentation or film projection, so as to reduce eyestrain, glare from light reflections, and will increase contrast and apparent brightness, making the presentations more readable, and will reduce all potentially harmful radiation effects from the cathode ray tube, which may be cumulative. Primarily, the system consists of an elevated cathode ray tube in the display housing, which produces its image on an inner frontal plane mirror where the image is projected onto and inner spherical morror that reflects the image through a housing cover glass to be seen by the user.
Inventors
- 👤 Joseph LaRussa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:51
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/023; G02B30/00; G02B30/50; G02B30/56; H; H04; H04N; H04N5/00; H04N5/74; H04N5/7408
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
162 words
A display system, comprising, a computer housing, a cathode ray tube positioned in said housing, a plane mirror secured in said housing, focusing means secured in said housing, for cooperation with said plane mirror to project and magnify an image produced by said cathode ray tube, for causing said image to appear a distance of approximately three feet from an observer and having a magnification of approximately three and a half times, and a cover glass secured in said housing for said observer to view said image, approximately six and a quarter inches being provided between said plane mirror and said cathode ray tube and approximately twelve and a half inches being provided between said plane mirror and said focusing means, said focuing means being a spherical mirror and including approximately a thirty six inch radius of curvature and cooperating with said plane mirror and said cathode ray tube to place said image said distance of approximately three feet from an observer.
Claim 2
Dependent Claim
162 words
A display system, comprising, a computer housing, a cathode ray tube positioned in said housing, a plane mirror secured in said housing, focusing means secured in said housing, for cooperation with said plane mirror to project and magnify an image produced by said cathode ray tube, for causing said image to appear a distance of approximately three feet from an observer and having a magnification of approximately three and a half times, and a cover glass secured in said housing for said observer to view said image, approximately six and a quarter inches being provided between said plane mirror and said cathode ray tube and approximately twelve and a half inches being provided between said plane mirror and said focusing means, said focuing means being a spherical mirror and including approximately a thirty six inch radius of curvature and cooperating with said plane mirror and said cathode ray tube to place said image said distance of approximately three feet from an observer.
Claim 3
Dependent Claim
45 words
The combination as set forth in claim 1, wherein said spherical mirror and said plane mirror cooperate with each other and reflect said image of said cathode ray tube to its normal left to right orientation without reversing said image on said cathode ray tube.
Claim 4
Dependent Claim
61 words
The combination as set forth in claim 2, wherein said cathode ray tube projects said image onto said plane mirror and said plane mirror reflects said image onto the arcuate concave surface of said spherical mirror, and said image is viewed by said observer through said cover glass that is secured in an opening provided in the front of said housing.
Claim 5
Dependent Claim
88 words
The combination as set forth in claim 3, wherein said cover glass is anti-reflection coated and is angularly inclined downward for further reducing the possibility of room objects and said observer himself being reflected back visibly, and all internal surfaces of said housing are blackened for eliminating stray reflections off of said cathode ray tube, and said cathode ray tube, said plane mirror, and said spherical mirror are fixed at angles in said housing that optically eliminate trapezoidal distortion as occurs in off-axis use of said spherical mirror.
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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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |