US4954744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-emitting device and electron-beam generator making use
Assignee: Canon Inc
•
Filing: 1989-05-24
•
Granted: 1990-09-04
•
Expires: 2009-05-24
Abstract
Abstract An electron-emitting device comprises electrodes mutually opposingly provided on the surface of a substrate, and an electron-emitting area provided between the electrodes, wherein a conductive film having an electrical resistance greater than that of said electron-emitting area and not more than 10 10 Ω/square is provided on the surface of the substrate at least at the peripheral area of the electron-emitting area in the state that it is electrically connected to said electrodes.
Inventors
- 👤 Hidetoshi Suzuki
- 👤 Ichiro Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:12
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/316
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
An electron-emitting device, comprising electrodes mutually opposingly provided in the surface of a substrate, and an electron-emitting area provided between said electrodes, wherein a conductive film having an electrical resistance greater than that of said electron-emitting area and not more than 10 10 Ω/square is provided on the surface of the substrate at least at the peripheral area of said electron-emitting area in the state that is electrically connected to said electrodes.
Claim 2
Dependent Claim
72 words
An electron-emitting device, comprising electrodes mutually opposingly provided in the surface of a substrate, and an electron-emitting area provided between said electrodes, wherein a conductive film having an electrical resistance greater than that of said electron-emitting area and not more than 10 10 Ω/square is provided on the surface of the substrate at least at the peripheral area of said electron-emitting area in the state that is electrically connected to said electrodes.
Claim 3
Dependent Claim
40 words
The electron-emitting device according to claim 1, wherein said conductive film comprises a deposited film comprising a boride, a carbide, a nitride, a metal, a metal oxide, a semiconductor, or carbon, and having a specific resistance of ρ<1×10 4 Ω·cm.
Claim 4
Dependent Claim
53 words
The electron-emitting device according to claim 2, wherein said conductive film has a film thickness t (cm) represented by the following relationship (1): ρ/R.sub.d >t>ρ·10.sup.-10 ( 1) wherein ρ represents specific resistance (Ω·cm) of the material used in said conductive film, and R d represents a sheet resistance (Ω/square) of said electron-emitting area.
Claim 5
Dependent Claim
38 words
The electron-emitting device according to claim 1, wherein said conductive film comprises a coated film comprising a boride, a carbide, a nitride, a metal oxide, a semiconductor, or carbon, and having a specific resistance of ρ≧1×10 4 Ω·cm.
Claim 6
Dependent Claim
39 words
The electron-emitting device according to claim 1, wherein said electron-emitting area has an electrical resistance of from 1×10 4 to 1×10 7 Ω/square and said conductive film has an electrical resistance of from 1×10 8 to 1×10 10 Ω/square.
Claim 7
Dependent Claim
13 words
The electron-emitting device according to claim 1, wherein said substrate comprises an insulator.
Claim 8
Dependent Claim
81 words
An electron-base generator, comprising electrodes mutually opposingly provided on the surface of a substrate; an electron-emitting area provided between said electrodes; a conductive film having an electrical resistance greater than that of said electron-emitting area and not more than 10 10 Ω/square, provided on the surface of the substrate at least at the peripheral area of said electron-emitting area in the state that it is electrically connected to said electrodes; and an electric source for applying a voltage between said electrodes.
Claim 9
Dependent Claim
81 words
An electron-base generator, comprising electrodes mutually opposingly provided on the surface of a substrate; an electron-emitting area provided between said electrodes; a conductive film having an electrical resistance greater than that of said electron-emitting area and not more than 10 10 Ω/square, provided on the surface of the substrate at least at the peripheral area of said electron-emitting area in the state that it is electrically connected to said electrodes; and an electric source for applying a voltage between said electrodes.
Claim 10
Dependent Claim
40 words
The electron-beam generator according to claim 7, wherein said conductive film comprises a deposited film comprising a boride, a carbide, a nitride, a metal, a metal oxide, a semiconductor, or carbon, and having a specific resistance of ρ<1×10 4 Ω·cm.
Claim 11
Dependent Claim
53 words
The electron-beam generator according to claim 8, wherein said conductive film has a film thickness t (cm) represented by the following relationship (1): ρ/R.sub.d >t>ρ·10.sup.-10 ( 1) wherein ρ represents specific resistance (Ω·cm) of the material used in said conductive film, and R d represents a sheet resistance (Ω/square) of said electron-emitting area.
Claim 12
Dependent Claim
38 words
The electron-beam generator according to claim 7, wherein said conductive film comprises a coated film comprising a boride, a carbide, a nitride, a metal oxide, a semiconductor, or carbon, and having a specific resistance of ρ≧1×10 4 Ω·cm.
Claim 13
Dependent Claim
39 words
The electron-beam generator according to claim 7, wherein said electron-emitting area has an electrical resistance of from 1×10 4 to 1×10 7 Ω/square and said conductive film has an electrical resistance of from 1×10 8 to 1×10 10 Ω/square.
Claim 14
Dependent Claim
13 words
The electron-beam generator according to claim 7, wherein said substrate comprises an insulator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |