US3775630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun device of field emission type
Assignee: Hitachi Ltd
•
Filing: 1972-07-18
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Granted: 1973-11-27
•
Expires: 1992-07-18
Abstract
Abstract An electron gun device of the field emission type comprising an electron emitting cathode tip, a filament for heating the cathode tip, an anode, and a charged particle emitting electrode, in which charged particles are emitted from the electrode and bombard the anode surface to outgas the anode.
Inventors
- 👤 Y Minamikawa
- 👤 T Komoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:32
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/021
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
In an electron gun device of the field emission type including a cathode tip of a needle shape, a filament for heating said cathode tip, an anode, and means for applying an electric voltage between said cathode tip and said anode to establish an electric field therebetween which causes electrons to be emitted from said cathode tip toward said anode, the improvement comprising means for emitting a beam of charged particles toward the surface of said anode, means for supporting said charged particle emission means, and power source means for supplying a required power to said charged particle emitting means.
Claim 2
Dependent Claim
100 words
In an electron gun device of the field emission type including a cathode tip of a needle shape, a filament for heating said cathode tip, an anode, and means for applying an electric voltage between said cathode tip and said anode to establish an electric field therebetween which causes electrons to be emitted from said cathode tip toward said anode, the improvement comprising means for emitting a beam of charged particles toward the surface of said anode, means for supporting said charged particle emission means, and power source means for supplying a required power to said charged particle emitting means.
Claim 3
Dependent Claim
20 words
An electron gun device according to claim 1, wherein said charged particle emitting means includes an electrode for emitting electrons.
Claim 4
Dependent Claim
31 words
An electron gun device according to claim 2, further comprising a voltage source connected between said electrode and said anode for applying accelerating voltage for electrons emitted from said electrode therebetween.
Claim 5
Dependent Claim
23 words
An electron gun device according to claim 3, wherein said supporting means is so constructed as to support said electrode and said filament.
References Cited (Backward Citations)
US3678333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |