Patent US3873872A successfully refreshed from Google Patents.
US3873872A
Expired / Lapsed
US
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Pyroelectric vidicon
Assignee: Philips North America LLC
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Filing: 1974-05-16
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Granted: 1975-03-25
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Expires: 1994-05-16
Abstract
Abstract A strain free electrically-conductive support for a target of a pyroelectric vidicon employs several metal bodies which are liquid at the ambient temperature to provide a floating mounting for the target. The metal body is a eutectic of indium and gallium which is liquid at the ambient temperature and has a very low vapor pressure in vacuum even at higher operating temperatures.
Inventors
- 👤 Thomas Henry Conklin
- 👤 Richard Liebert
- 👤 Leonard Berandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:17
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A television camera tube comprising an envelope having a window at one end which is transparent to infra-red radiation, a pyroelectric target element disposed to receive on one surface thereof a thermal image and produce on an opposite surface a charge image corresponding to said thermal image, means within said envelope including a cathode for producing an electron beam, means to scan the surface of said target having the charge image with said electron beam to periodically reduce areas of said surface to cathode potential, and means to support said target free of strain on said window, said latter means comprising an annular layer of a first electrically conductive metal which adheres to said window and a plurality of spaced metal bodies on opposite sides of said target each constituted of a second metal which adheres to said first metal and a third metal which forms a eutectic with the second metal having a melting point below about 16* C, said eutectic flowing around the edge of said target whereby said target is floatingly supported by said metal bodies.
Claim 2
Dependent Claim
179 words
A television camera tube comprising an envelope having a window at one end which is transparent to infra-red radiation, a pyroelectric target element disposed to receive on one surface thereof a thermal image and produce on an opposite surface a charge image corresponding to said thermal image, means within said envelope including a cathode for producing an electron beam, means to scan the surface of said target having the charge image with said electron beam to periodically reduce areas of said surface to cathode potential, and means to support said target free of strain on said window, said latter means comprising an annular layer of a first electrically conductive metal which adheres to said window and a plurality of spaced metal bodies on opposite sides of said target each constituted of a second metal which adheres to said first metal and a third metal which forms a eutectic with the second metal having a melting point below about 16* C, said eutectic flowing around the edge of said target whereby said target is floatingly supported by said metal bodies.
Claim 3
Dependent Claim
16 words
A television camera tube as claimed in claim 1 in which the metal bodies are spheres.
Claim 4
Dependent Claim
20 words
A television camera tube as claimed in claim 1 in which the spheres are a eutectic of indium and gallium.
Claim 5
Dependent Claim
16 words
A television camera tube as claimed in claim 3 in which the target is triglycine sulfate.
Claim 6
Dependent Claim
17 words
A television camera tube as claimed in claim 4 in which the first metal layer is chromium.
References Cited (Backward Citations)
US3385991A
Cited
US3662825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |