US4019084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyroelectric vidicon having a protective covering on the pyroelectric target
Assignee: Philips North America LLC
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Filing: 1975-10-02
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Granted: 1977-04-19
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Expires: 1995-10-02
Abstract
Abstract In a pyroelectric vidicon, the target is covered with a layer of vacuum compatible material which has a high secondary emission coefficient, a low first cross-over and low conductivity to prevent decomposition of the target.
Inventors
- 👤 Thomas H. Conklin
- 👤 Barry M. Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:24
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/458
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
In a pyroelectric vidicon including an evacuated envelope having a pyroelectric target at one end and an electron gun at the other end for scanning a surface of the target, said target consisting of a material which is unstable in a vacuum and decomposes upon heating and selected from the group consisting of tri-glycine sulfate, tri-glycine fluoberylliate and alanine tri-glycine sulfate, the improvement wherein the surface of said target exposed to the vacuum is covered with a protective coating of a vacuum compatible material having a relatively high secondary emission coefficient, a low first cross-over and a low conductivity, said latter material being selected from the group consisting of Al 2 O 3 , Si 3 N 4 and Si O x , x being between 1 and 2.
Claim 2
Dependent Claim
129 words
In a pyroelectric vidicon including an evacuated envelope having a pyroelectric target at one end and an electron gun at the other end for scanning a surface of the target, said target consisting of a material which is unstable in a vacuum and decomposes upon heating and selected from the group consisting of tri-glycine sulfate, tri-glycine fluoberylliate and alanine tri-glycine sulfate, the improvement wherein the surface of said target exposed to the vacuum is covered with a protective coating of a vacuum compatible material having a relatively high secondary emission coefficient, a low first cross-over and a low conductivity, said latter material being selected from the group consisting of Al 2 O 3 , Si 3 N 4 and Si O x , x being between 1 and 2.
Claim 3
Dependent Claim
34 words
A pyroelectric vidicon as claimed in claim 1 wherein the material of the pyroelectric target is tri-glycine sulfate and said vacuum compatible material is Si O x , x being between 1 and 2.
References Cited (Backward Citations)
US3725711A
Cited
US3928768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |