US5201681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of emitting electrons
Assignee: Canon Inc
•
Filing: 1992-03-09
•
Granted: 1993-04-13
•
Expires: 2012-03-09
Abstract
Abstract A method of emitting electrons by applying a voltage between a voltage application electrode and a target to be irradiated with the electrons emitted from an electron emission electrode with a conical portion in an electron emission device. The voltage application electrode is formed to oppose the electron emission electrode so as to sandwich an insulating layer therebetween and the target. A charge of the electron emission electrode which is lost by electron emission during an electron emission operation is supplied after the electron emission operation is completed.
Inventors
- 👤 Masahiko Okunuki
- 👤 Akira Suzuki
- 👤 Isamu Shimoda
- 👤 Tetsuya Kaneko
- 👤 Takeo Tsukamoto
- 👤 Toshihiko Takeda
- 👤 Takao Yonehara
- 👤 Takeshi Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:20
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/022; H01J9/025; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042; H01J3/00; H01J3/02; H01J3/021; H01J3/022; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/127; H01J2201/00; H01J2201/30; H01J2201/304; H01J2201/30446
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A method of emitting electrons by applying a voltage between a voltage application electrode and a target to be irradiated with the electrons emitted from an electron emission electrode with a conical portion in an electron emission device comprising said electron emission electrode, the voltage application electrode formed to oppose the electron emission electrode so as to sandwich an insulating layer therebetween and the target, wherein a charge of the electron emission electrode which is lost by electron emission during an electron emission operation is supplied after the electron emission operation is completed.
Claim 2
Independent Claim
93 words
A method of emitting electrons by applying a voltage between a voltage application electrode and a target to be irradiated with the electrons emitted from an electron emission electrode with a conical portion in an electron emission device comprising said electron emission electrode, the voltage application electrode formed to oppose the electron emission electrode so as to sandwich an insulating layer therebetween and the target, wherein a charge of the electron emission electrode which is lost by electron emission during an electron emission operation is supplied after the electron emission operation is completed.
Claim 3
Dependent Claim
23 words
A method of emitting electrons according to claim 1, wherein the electron emission electrode is supplied with the charge in a pulse form.
Claim 4
Dependent Claim
23 words
A method of emitting electrons according to claim 2, wherein the electron emission quantity is changed by varying an interval of the pulses.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |