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US3942008A
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Thermal imaging device
Assignee: United States Department of the Army
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Filing: 1974-12-23
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Granted: 1976-03-02
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Expires: 1994-12-23
Abstract
Abstract A unique imaging device operating in the far infrared is provided by utilng fiber optic techniques. The system is used to improve the performance of photoconductive and thermoresistive type retinas.
Inventors
- 👤 Clifford F. Eve
- 👤 Max Garbuny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/458; H01J29/86; H01J29/89; H01J29/892; H01J31/00; H01J31/08; H01J31/49
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
In a far infrared image converter with a lens system defining an image plane a photosensitive element comprising: a bundle of optical fibers each having a first end face in said image plane and a second end face in a resolving plane; and a single continuous planar electrical heat detecting retina mounted in parallel relationship to said resolving plane and spaced less than 0.1 mm from all of said second end faces.
Claim 2
Dependent Claim
72 words
In a far infrared image converter with a lens system defining an image plane a photosensitive element comprising: a bundle of optical fibers each having a first end face in said image plane and a second end face in a resolving plane; and a single continuous planar electrical heat detecting retina mounted in parallel relationship to said resolving plane and spaced less than 0.1 mm from all of said second end faces.
Claim 3
Dependent Claim
72 words
A converter according to claim 1 wherein: at least a portion of said fibers are transparent to far infrared and coated with a material having a coating with index of refraction n 2 related to the index of refraction n 1 of the fiber by the relation sin θ m = √n 1 2 - n 2 2 , where θ m is the half angle of view of said lens system.
Claim 4
Dependent Claim
38 words
A converter according to claim 1 wherein said bundle contains: a first plurality of fibers transparent to far infrared; and a second plurality of fibers opaque to far infrared, said opaque fibers separating each of said transparent fibers.
Claim 5
Dependent Claim
35 words
A converter according to claim 1 wherein said retina comprises: a layer of insulating material, transparent to IR, facing said end faces of said fibers; and a layer of smoke attached to said insulating layer.
Claim 6
Dependent Claim
48 words
A converter according to claim 1 wherein said retina comprises: a layer of insulating smoke attached to the second end faces of said fibers; a layer of gold black attached to said layer of smoke; and a layer of semi-conducting smoke attached to said layer of gold black.
Claim 7
Dependent Claim
37 words
A converter according to claim 1 wherein said retina comprises: a layer of gold black attached to the second end faces of said fibers; and a layer of semiconducting smoke attached to said layer of gold black.
Claim 8
Dependent Claim
16 words
A converter according to claim 3 wherein: said opaque fibers are smaller than said transparent fibers.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |