US4974089A
Expired / Lapsed
US
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Television camera apparatus using gradient index rod lens
Assignee: Litton Marine Systems Inc
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Filing: 1989-01-18
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Granted: 1990-11-27
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Expires: 2009-01-18
Abstract
Abstract A gradient index rod lens is utilized to focus the intensified output image from an image intensifier onto the sensor surface of a focal plane array assembly through the window or filter of the focal plane array assembly.
Inventors
- 👤 Lawrence H. Gilligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:20
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/50; H04N23/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
Low light level television camera sensor apparatus comprising: image intensifier means for providing an intensified image, gradient index rod lens means light coupled to said image intensifier means for focussing said intensified image from said image intensifier means onto a predetermined plane, a focal plane array assembly having a focal plane array sensor surface at said predetermined plane such that said gradient index rod lens means focuses said intensified image on said sensor surface and a transparent window disposed between said gradient index rod lens means and said focal plane array sensor surface, said gradient index rod lens means focussing said intensified image on said surface through said window.
Claim 2
Dependent Claim
109 words
Low light level television camera sensor apparatus comprising: image intensifier means for providing an intensified image, gradient index rod lens means light coupled to said image intensifier means for focussing said intensified image from said image intensifier means onto a predetermined plane, a focal plane array assembly having a focal plane array sensor surface at said predetermined plane such that said gradient index rod lens means focuses said intensified image on said sensor surface and a transparent window disposed between said gradient index rod lens means and said focal plane array sensor surface, said gradient index rod lens means focussing said intensified image on said surface through said window.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 wherein said window is cemented to said surface.
Claim 4
Dependent Claim
37 words
The apparatus of claim 1 wherein said image intensifier means, said gradient index rod lens means and said focal plane array means are disposed with respect to each other so that image magnification or reduction is effected.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein said gradient index rod lens means comprises a monolithic gradient index rod lens.
Claim 6
Dependent Claim
20 words
The apparatus of claim 1 wherein said gradient index rod lens means comprises an array of gradient index rod lenses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |