US4399455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television viewer
Assignee: Individual
•
Filing: 1981-06-18
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Granted: 1983-08-16
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Expires: 2001-06-18
Abstract
Abstract A viewing system for use with a cathode ray tube display comprising an objective lens which focuses the display image onto a limited light diverging screen having orthogonally arranged lenticular lenses on its opposite planar surfaces and which diverts the projected light to produce an image of maximum brightness in a hypothetical ellipse having a major dimension of six inches and minor dimension of two inches at a viewing distance of sixteen inches.
Inventors
- 👤 Luis W. Alvarez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:57
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
208 words
A viewing system for use by a single viewer of a single electronic display comprising a projection lens having an aperture, a limited, light diverging screen viewed by the viewer, the screen having a Fresnel lens means incorporated therein with a front face and a rear face which optically faces the projection lens, wherein the projection lens projects the light image from the single electronic display onto the Fresnel lens means, the Fresnel lens means comprising a first set of parallel, straight lens Fresnel lens elements on the rear face and a second set of parallel, straight line Fresnel lens elements on the front face which are arranged orthogonal to the first elements, at least some of said first and second elements being contoured to act as a combined simple field lens for focusing an image of the projection lens aperture at an exit pupil located at a predetermined viewing distance from the screen while simultaneously spreading the image over an oval shaped area having predetermined minor and major axial dimensions and which is contained in a plane, parallel to the screen and located at the predetermined viewing distance from the screen, with substantially all of the light image passing through the projection lens hitting the exit pupil.
Claim 2
Dependent Claim
208 words
A viewing system for use by a single viewer of a single electronic display comprising a projection lens having an aperture, a limited, light diverging screen viewed by the viewer, the screen having a Fresnel lens means incorporated therein with a front face and a rear face which optically faces the projection lens, wherein the projection lens projects the light image from the single electronic display onto the Fresnel lens means, the Fresnel lens means comprising a first set of parallel, straight lens Fresnel lens elements on the rear face and a second set of parallel, straight line Fresnel lens elements on the front face which are arranged orthogonal to the first elements, at least some of said first and second elements being contoured to act as a combined simple field lens for focusing an image of the projection lens aperture at an exit pupil located at a predetermined viewing distance from the screen while simultaneously spreading the image over an oval shaped area having predetermined minor and major axial dimensions and which is contained in a plane, parallel to the screen and located at the predetermined viewing distance from the screen, with substantially all of the light image passing through the projection lens hitting the exit pupil.
Claim 3
Dependent Claim
39 words
A viewing system as recited in claim 1 wherein the projection lens is bifurcated into separate halves and further comprising a rotatable, color filter wheel mounted to rotate in a plane located between the halves of the projection lens.
Claim 4
Dependent Claim
24 words
A viewing system as recited in claim 2 wherein the bifurcated projection lens comprises a pair of Cook triplet lenses taken back to back.
Claim 5
Dependent Claim
18 words
A viewing system as recited in claim 2 wherein the bifurcated objective lens comprises a double Gauss lens.
Claim 6
Dependent Claim
31 words
A viewing system as recited in claim 1 wherein the predetermined viewing distance is sixteen inches and the predetermined minor and major axial dimensions are two inches and six inches, respectively.
Claim 7
Dependent Claim
60 words
A viewing system as recited in claim 1 further comprising a rotatable, color filter wheel mounted to rotate in a plane which is perpendicular to, and intersected by the optical axis, with the diameter of the wheel being smaller than the height of the screen, and with the term height being taken in respect to a viewer of the screen.
Claim 8
Dependent Claim
31 words
A viewing system as recited in claim 1 wherein the predetermined viewing distance is sixteen inches and the predetermined minor and major axial dimensions are two inches and six inches, respectively.
Claim 9
Dependent Claim
22 words
A viewing system as recited in claim 1 wherein the maximum width of the straight line Fresnel lens elements is 0.0047 inches.
Claim 10
Dependent Claim
88 words
A viewing system as recited in claim 1 in combination with a field sequential, cathode ray tube display means for displaying black and white images in a predetermined sequence corresponding to predetermined colored images and further comprising a rotating color wheel having a plurality of individual colored segments, the rotating wheel being synchronized in its rotation with the predetermined color fields being displayed and being located near the projection lens such that the display image passes through the corresponding colored individual segments of the wheel as it rotates.
Claim 11
Dependent Claim
35 words
The combination recited in claim 9 wherein the diameter of the color wheel does not exceed the height of the screen, with the term height being taken with respect to the viewer of the screen.
Claim 12
Dependent Claim
70 words
A viewing system as recited in claim 1 wherein both the first and second sets of Fresnel lens elements are stepped grooves, the risers of which have plane front surfaces, are of progressively decreasing slope toward the center of the rear and front faces of the screen, face away from the center of the rear and front faces of the screen, and have superimposed thereon a concave cylindrical lens surface.
Claim 13
Dependent Claim
70 words
A viewing system as recited in claim 1 wherein both the first and second sets of Fresnel lens elements are stepped grooves, the risers of which have plane front surfaces, are of progressively decreasing slope toward the center of the rear and front faces of the screen, face away from the center of the rear and front faces of the screen, and have superimposed thereon a convex cylindrical lens surface.
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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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |