US3941999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic focus pulse gated system
Assignee: United States Department of the Army
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Filing: 1975-04-01
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Granted: 1976-03-02
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Expires: 1995-04-01
Abstract
Abstract An improved active type of infrared viewing system is provided using pulseated techniques which displays the complete Z (range) axis simultaneously and provides uniform image intensity at all ranges.The invention described herein may be manufactured, used, and licensed by of for the Government for governmental purposes without the payment to me of any royalty thereon.
Inventors
- 👤 Thomas E. Moyers, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:39
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/08; G01S17/10; G01S17/18; G01S17/88; G01S17/89; H01J2229/00; H01J2229/89; H01J2229/8926
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
In an image viewing system having a pulse gated image intensifier tube, an integral source of synchronized illumination, a variable delay means for said gating pulse, means to generate said gating pulse and a manually focussed objective lens, the improvement comprising: automatic means for continuously varying the effective focal length of said objective lens and the delay of said delay means in concert.
Claim 2
Dependent Claim
63 words
In an image viewing system having a pulse gated image intensifier tube, an integral source of synchronized illumination, a variable delay means for said gating pulse, means to generate said gating pulse and a manually focussed objective lens, the improvement comprising: automatic means for continuously varying the effective focal length of said objective lens and the delay of said delay means in concert.
Claim 3
Dependent Claim
36 words
An image intensifier according to claim 1 wherein said automatic means continuously varies the dielectric constant of a preselected path length which is equal for all light rays from said illuminator passing through said objective lens.
Claim 4
Dependent Claim
55 words
An image intensifier according to claim 1 wherein said automatic means includes a first solid dielectric member having portions of various thicknesses parallel to the light rays from said illuminator passing through said objective lens; and drive means for moving said first member so that said portions appear alternately in the path of said rays.
Claim 5
Dependent Claim
52 words
An image intensifier according to claim 3 wherein: the thickness of said member varies linearly in the direction of motion of said member; and a second member having a thickness varying in inverse relationship to said first member is placed in fixed relationship to and in the path of said light rays.
Claim 6
Dependent Claim
21 words
An image intensifier according to claim 1 wherein said automatic means simultaneously varies the overall intensity level of said intensifier tube.
Claim 7
Dependent Claim
21 words
An image intensifier according to claim 2 wherein said automatic means simultaneously varies the overall intensity level of said intensifier tube.
Claim 8
Dependent Claim
21 words
An image intensifier according to claim 3 wherein said automatic means simultaneously varies the overall intensity level of said intensifier tube.
Claim 9
Dependent Claim
21 words
An image intensifier according to claim 4 wherein said automatic means simultaneously varies the overall intensity level of said intensifier tube.
References Cited (Backward Citations)
US3682553A
Cited
US3903451A
Cited
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 |