US4004093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Truncated Schmidt optical systems for projecting color television pictures
Assignee: Tinsley Laboratories Inc
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Filing: 1975-12-12
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Granted: 1977-01-18
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Expires: 1995-12-12
Abstract
Abstract A plurality of Schmidt optical systems is clustered together by truncating mutually adjacent edges of mirrors and correcting lenses which comprise individual Schmidt systems. By clustering individual systems together, keystone distortion is minimized.
Inventors
- 👤 Bradley H. Oland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:54
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A compact Schmidt optical system for projecting color television pictures from cathode ray tubes onto a screen comprising, a plurality of individual Schmidt optical systems adjacently clustered together, each Schmidt optical system comprising, (a) a curved mirror positioned for receiving an image from a respective cathode ray tube and projecting said images toward a screen for common registration with other projected images, and (b) a corrector lens spaced between the curved mirror and the screen, said corrector lens shaped to reduce spherical aberration in said image, each adjacent curved mirror and each adjacent corrector lens having adjacent parallel edges, said edges being chords truncating mirror and lens bodies to permit clustering of adjacent Schmidt optical systems.
Claim 2
Dependent Claim
116 words
A compact Schmidt optical system for projecting color television pictures from cathode ray tubes onto a screen comprising, a plurality of individual Schmidt optical systems adjacently clustered together, each Schmidt optical system comprising, (a) a curved mirror positioned for receiving an image from a respective cathode ray tube and projecting said images toward a screen for common registration with other projected images, and (b) a corrector lens spaced between the curved mirror and the screen, said corrector lens shaped to reduce spherical aberration in said image, each adjacent curved mirror and each adjacent corrector lens having adjacent parallel edges, said edges being chords truncating mirror and lens bodies to permit clustering of adjacent Schmidt optical systems.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1 wherein said curved mirrors have a circular shape with spaced, opposed chords truncating said circular shape.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1 wherein said corrector lenses have a circular shape with spaced, opposed chords truncating said circular shape.
Claim 5
Dependent Claim
16 words
The apparatus of claim 1 wherein adjacent clustered curved mirrors are formed on a single substrate.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1 wherein adjacent corrector lenses are formed on a single substrate.
Claim 7
Dependent Claim
34 words
The apparatus of claim 1 wherein said curved mirrors and reflector lenses have a circular shape with spaced, opposed chords truncating said circular shape for side-by-side placement of adjacent mirrors and adjacent corrector lenses.
Claim 8
Dependent Claim
64 words
The apparatus of claim 6 wherein the number of Schmidt optical systems clustered together is three, with a central system, an upper system and a lower system, said central system having a second axis which is orthogonal to a screen, said upper system and said lower system having respective first and third axes, making acute angles with said second axis of less than 4°.
Claim 9
Dependent Claim
12 words
The apparatus of claim 7 wherein said acute angle is approximately 2.9°.
References Cited (Backward Citations)
US1124253A
Cited
US2999126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |