Patent US4068145A successfully refreshed from Google Patents.
US4068145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated elastic support and clamping means for resistance heaters and emitter tip of electron gun
Assignee: Jeol Ltd
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Filing: 1976-12-20
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Granted: 1978-01-10
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Expires: 1996-12-20
Abstract
Abstract An electron gun having a thermionic emitter held by boron carbide heating members or the like, supported by electroconductive members which have additional elastic positioning members arranged to nullify the emitter shift and other effects caused by heat distortion.
Inventors
- 👤 Seiichi Nakagawa
- 👤 Youichi Shibuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:03
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J29/00; H01J29/02; H01J29/04; H01J29/46; H01J29/48; H01J29/484; H01J3/00; H01J3/02; H01J3/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A thermal emission type electron gun comprising: a. an emitter tip (1) being a material capable of electron emission when heated; b. electrical resistance means (2a,3a) abutting said emitter tip for heating said emitter tip; c. means for clamping said heating means (9,11) against said emitter tip and supporting said heating means and tip within the gun; and, d. elastic support means for pressing said clamping means against the heating means and emitter tip comprising elastic biasing means (18, 19) fixed to the clamping means at a location spaced from the emitter tip where the temperature of the clamping means is substantially lower than near the tip and an insulating means (22,23) wedged between the elastic biasing means and the clamping means applying pressure to the clamping means near the emitter tip whereby heat expansion of the clamping means is absorbed by the elastic biasing means.
Claim 2
Dependent Claim
146 words
A thermal emission type electron gun comprising: a. an emitter tip (1) being a material capable of electron emission when heated; b. electrical resistance means (2a,3a) abutting said emitter tip for heating said emitter tip; c. means for clamping said heating means (9,11) against said emitter tip and supporting said heating means and tip within the gun; and, d. elastic support means for pressing said clamping means against the heating means and emitter tip comprising elastic biasing means (18, 19) fixed to the clamping means at a location spaced from the emitter tip where the temperature of the clamping means is substantially lower than near the tip and an insulating means (22,23) wedged between the elastic biasing means and the clamping means applying pressure to the clamping means near the emitter tip whereby heat expansion of the clamping means is absorbed by the elastic biasing means.
Claim 3
Dependent Claim
20 words
A thermal emission type electron gun as defined in claim 1, wherein said emitter tip is made of lanthanum hexaboride.
Claim 4
Dependent Claim
20 words
A thermal emission type electron gun as defined in claim 1, therein said heating means is made of pyrolytic graphite.
Claim 5
Dependent Claim
20 words
A thermal emission type electron gun as defined in claim 1, wherein said heating means is made of boron carbide.
Claim 6
Dependent Claim
48 words
A thermal emission type electron gun as defined in claim 1, wherein said means for clamping comprise inner extensions (9,11) and outer extensions (11,12), said inner extensions holding said means for heating and said outer extensions guiding the insulating means wedge between the biasing means and outer extensions.
References Cited (Backward Citations)
US3478244A
Cited
US3532923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |