US5650795A
Expired / Lapsed
US
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Electron source and manufacture method of same, and image forming device and manufacture method of same
Assignee: Canon Inc
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Filing: 1993-12-23
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Granted: 1997-07-22
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Expires: 2013-12-23
Abstract
Abstract In an electron source comprising a base plate and an electron emitting element disposed on the base plate, the electron emitting element includes a plurality of electron emitting portions electrically connected in parallel, the electrical connection being made through a thermally cut-off member. After forming the plurality of electron emitting portions, their electron emission characteristics are checked and, for that electron emitting portion on which the electron emission characteristic has been found not normal, the electrical connection is cut off. Alternatively, the electron emitting element includes an electron emitting portion connected to a voltage supply through a thermally cut-off member, and an electron emitting portion forming film which includes a thermally connecting member. In this case, after cutting off the electrical connection in that electron emitting portion on which the electron emission characteristic has been found not normal, the electron emitting portion forming film is connected to the voltage supply for forming another electron emitting portion in the film. With such an electron source and an image forming device using the electron source, a production yield and image quality are improved.
Inventors
- 👤 Yoshikazu Banno
- 👤 Seishiro Yoshioka
- 👤 Ichiro Nomura
- 👤 Hidetoshi Suzuki
- 👤 Tetsuya Kaneko
- 👤 Toshihiko Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:09
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/04; H01J1/00; H01J1/02; H01J1/30; H01J1/316
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
60 words
An electron source comprising a base plate and an electron emitting element disposed on said base plate, wherein: said electron emitting element includes a plurality of electron emitting portions electrically connected in parallel through a wire, said wire being connected to each of said electron emitting portions via a thermally activated connection cut-off member that is eradicated upon being heated.
Claim 2
Dependent Claim
60 words
An electron source comprising a base plate and an electron emitting element disposed on said base plate, wherein: said electron emitting element includes a plurality of electron emitting portions electrically connected in parallel through a wire, said wire being connected to each of said electron emitting portions via a thermally activated connection cut-off member that is eradicated upon being heated.
Claim 3
Dependent Claim
47 words
An electron source according to claim 1, wherein said electron emitting element is arranged such that a plurality of conductive films including electron emitting portions are electrically connected in parallel between electrodes, said electrodes and said conductive films being connected through the thermally activated connection cut-off members.
Claim 4
Dependent Claim
19 words
An electron source according to claim 1, wherein said electron emitting element is a surface conduction electron emitting element.
Claim 5
Dependent Claim
21 words
An electron source according to claim 1, wherein said electron emitting element is disposed plural in number on said base plate.
Claim 6
Dependent Claim
32 words
An electron source according to claim 1, wherein said source includes means for modifying a drive signal applied to said electron emitting element depending on the number of said electron emitting portions.
Claim 7
Dependent Claim
45 words
An electron source according to claim 1, wherein said electron emitting element includes plural electron emitting segments, and means for modifying drive signals applied to said electron emitting segments depending on the number of the electron emitting portions in each of said electron emitting segments.
Claim 8
Dependent Claim
55 words
An electron source according to claim 1, wherein said source includes memory means for storing the number of the electron emitting portions electrically connected to said wire in said electron emitting element, and means for modifying a drive signal applied to said electron emitting element in accordance with the information stored in said memory means.
Claim 9
Dependent Claim
65 words
An electron source according to claim 1, wherein said source includes said electron emitting element plural in number, memory means for storing the number of the electron emitting portions electrically connected to said wire in each of said electron emitting elements, and means for modifying drive signals applied to said electron emitting elements per element in accordance with the information stored in said memory means.
Claim 10
Dependent Claim
55 words
An image forming device comprising an electron source according to any one of claims 1-8, an image forming member for producing an image upon irradiation of an electron beam emitted from said electron source, and modulation means for modulating said electron beam irradiated to said image forming member in accordance with an input image signal.
Claim 11
Dependent Claim
21 words
An electron source according to claim 1, wherein a scattering preventive member is provided between said thermally activated connection cut-off members.
Claim 12
Dependent Claim
20 words
An electron source according to claim 1, wherein each of said thermally activated connection cut-off members has a notched portion.
Claim 13
Dependent Claim
89 words
An electron source comprising a base plate and an electron emitting element disposed on said base plate, wherein: said electron emitting element includes an electron emitting portion connected to voltage supply means through a wire, said wire being connected to the electron emitting portion via a thermally activated connection cut-off member that is eradicated upon being heated, and an electron emitting portion forming film with a thermally activated connecting member that forms a connection between the electron emitting portion forming film and the voltage supply means upon being heated.
Claim 14
Dependent Claim
89 words
An electron source comprising a base plate and an electron emitting element disposed on said base plate, wherein: said electron emitting element includes an electron emitting portion connected to voltage supply means through a wire, said wire being connected to the electron emitting portion via a thermally activated connection cut-off member that is eradicated upon being heated, and an electron emitting portion forming film with a thermally activated connecting member that forms a connection between the electron emitting portion forming film and the voltage supply means upon being heated.
Claim 15
Dependent Claim
48 words
An electron source according to claim 12, wherein said electron emitting element includes, between electrodes, a conductive film connected to said electrodes through said thermally activated connection cut-off member and including said electron emitting portions, and said electron emitting portion forming film with said thermally activated connecting member.
Claim 16
Dependent Claim
27 words
An electron source according to claim 13, wherein said thermally activated connecting member is disposed between one of said electrodes and said electron emitting portion forming film.
Claim 17
Dependent Claim
19 words
An electron source according to claim 12, wherein said electron emitting element is a surface conduction electron emitting element.
Claim 18
Dependent Claim
21 words
An electron source according to claim 12, wherein said electron emitting element is disposed plural in number on said base plate.
Claim 19
Dependent Claim
35 words
An electron source according to claim 12, wherein said source includes means for modifying a drive signal applied to said electron emitting element in accordance with an electron emission characteristic of said electron emitting element.
Claim 20
Dependent Claim
45 words
An electron source according to claim 12, wherein said source includes said electron emitting element plural in number, and means for modifying drive signals applied to said electron emitting elements per element in accordance with differences in electron emission characteristics of said electron emitting elements.
Claim 21
Dependent Claim
57 words
An image forming device comprising an electron source according to any one of claims 12 to 18, an image forming member for producing an image upon irradiation of an electron beam emitted from said electron source, and modulation means for modulating said electron beam irradiated to said image forming member in accordance with an input image signal.
Claim 22
Dependent Claim
116 words
A manufacture method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, comprising the steps of: forming a plurality of electron emitting portions electrically connected in parallel through a wire, said wire being connected to each of said electron emitting portions via a thermally activated connection cut-off member that is eradicated upon being heated, on said base plate, checking said plurality of electron emitting portions to detect electron emission characteristics, and cutting off, by heating said thermally activated connection cut-off member, said electrical connection in that electron emitting portion on which said electron emission characteristic has been found not normal as a result of said checking step.
Claim 23
Dependent Claim
116 words
A manufacture method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, comprising the steps of: forming a plurality of electron emitting portions electrically connected in parallel through a wire, said wire being connected to each of said electron emitting portions via a thermally activated connection cut-off member that is eradicated upon being heated, on said base plate, checking said plurality of electron emitting portions to detect electron emission characteristics, and cutting off, by heating said thermally activated connection cut-off member, said electrical connection in that electron emitting portion on which said electron emission characteristic has been found not normal as a result of said checking step.
Claim 24
Dependent Claim
34 words
A manufacture method for an electron source according to claim 20, wherein said step of forming said electron emitting portions includes a step of subjecting electron emitting portion forming films to an electrification process.
Claim 25
Dependent Claim
68 words
A manufacture method for an image forming device comprising an electron source, an image forming member for producing an image upon irradiation of an electron beam emitted from said electron source, and modulation means for modulating said electron beam irradiated to said image forming member in accordance with an input image signal, wherein said electron source is fabricated by said manufacture method according to claim 20 or 21.
Claim 26
Dependent Claim
35 words
A manufacture method for an electron source according to claim 20, wherein said step of forming said electron emitting portion includes a step of subjecting said electron emitting portion forming film to an electrification process.
Claim 27
Dependent Claim
174 words
A manufacture method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, comprising the steps of: forming an electron emitting portion connected to voltage supply means through a wire, said wire being connected to said electron emitting portion via a thermally activated connection cut-off member that is eradicated upon being heated, forming an electron emitting portion forming film with a thermally activated connecting member that forms a connection between said electron emitting portion forming film and said voltage supply means upon being heated on said base plate, checking said electron emitting portion to detect an electron emission characteristic, cutting off, by heating said thermally activated connection cut-off member, said connection in that electron emitting portion on which said electron emission characteristic has been found not normal as a result of said checking step, connecting, by heating said thermally activated connecting member, said electron emitting portion forming film to said voltage supply means, and forming an electron emitting portion in said electron emitting portion forming film.
Claim 28
Dependent Claim
174 words
A manufacture method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, comprising the steps of: forming an electron emitting portion connected to voltage supply means through a wire, said wire being connected to said electron emitting portion via a thermally activated connection cut-off member that is eradicated upon being heated, forming an electron emitting portion forming film with a thermally activated connecting member that forms a connection between said electron emitting portion forming film and said voltage supply means upon being heated on said base plate, checking said electron emitting portion to detect an electron emission characteristic, cutting off, by heating said thermally activated connection cut-off member, said connection in that electron emitting portion on which said electron emission characteristic has been found not normal as a result of said checking step, connecting, by heating said thermally activated connecting member, said electron emitting portion forming film to said voltage supply means, and forming an electron emitting portion in said electron emitting portion forming film.
Claim 29
Dependent Claim
68 words
A manufacture method for an image forming device comprising an electron source, an image forming member for producing an image upon irradiation of an electron beam emitted from said electron source, and modulation means for modulating said electron beam irradiated to said image forming member in accordance with an input image signal, wherein said electron source is fabricated by said manufacture method according to claim 24 or 23.
Claim 30
Dependent Claim
123 words
A repairing method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, said electron emitting element having a plurality of electron emitting portions electrically connected in parallel through a wire, said wire being connected to each of said electron emitting portions via a thermally activated connection cut-off member that is eradicated upon being heated, comprising the steps of: checking said plurality of electron emitting portions to detect an electron emission characteristic which is not normal; and cutting off, by heating said thermally activated connection cut-off member, the electrical connection of the electron emitting portion of which the electron emission characteristic has been found to be not normal as a result of said checking step.
Claim 31
Dependent Claim
123 words
A repairing method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, said electron emitting element having a plurality of electron emitting portions electrically connected in parallel through a wire, said wire being connected to each of said electron emitting portions via a thermally activated connection cut-off member that is eradicated upon being heated, comprising the steps of: checking said plurality of electron emitting portions to detect an electron emission characteristic which is not normal; and cutting off, by heating said thermally activated connection cut-off member, the electrical connection of the electron emitting portion of which the electron emission characteristic has been found to be not normal as a result of said checking step.
Claim 32
Dependent Claim
27 words
A repairing method according to claim 26, wherein said plurality of electron emitting portions are formed by subjecting electron emitting portion forming films to an electrification process.
Claim 33
Dependent Claim
69 words
A repairing method for an image forming device comprising an election source, an image forming member for producing an image upon irradiation of an electron beam emitted from said electron source, and modulation means for modulating said electron beam irradiated to said image forming member in accordance with an input image signal, wherein said electron source is repaired by the repairing method according to claim 26 or claim 27.
Claim 34
Dependent Claim
181 words
A repairing method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, said electron emitting element having an electron emitting portion connected to voltage supply means through a wire, said wire being connected to said electron emitting portion via a thermally activated connection cut-off member that is eradicated upon being heated, and an electron emitting portion forming film with a thermally activated connecting member that forms a connection between said electron emitting portion forming film and said voltage supply means upon being heated, comprising the steps of: checking said electron emitting portion to detect an electron emission characteristic which is not normal; cutting off by heating said thermally activated connection cut-off member, the electrical connection of the electron emitting portion of which the electron emission characteristic has been found to be not normal as a result of said checking step; connecting, by heating said thermally activated connecting member, said electron emitting portion forming film to said voltage supply means; and forming an electron emitting portion in said electron emitting portion forming film.
Claim 35
Dependent Claim
181 words
A repairing method for an electron source comprising a base plate and an electron emitting element disposed on said base plate, said electron emitting element having an electron emitting portion connected to voltage supply means through a wire, said wire being connected to said electron emitting portion via a thermally activated connection cut-off member that is eradicated upon being heated, and an electron emitting portion forming film with a thermally activated connecting member that forms a connection between said electron emitting portion forming film and said voltage supply means upon being heated, comprising the steps of: checking said electron emitting portion to detect an electron emission characteristic which is not normal; cutting off by heating said thermally activated connection cut-off member, the electrical connection of the electron emitting portion of which the electron emission characteristic has been found to be not normal as a result of said checking step; connecting, by heating said thermally activated connecting member, said electron emitting portion forming film to said voltage supply means; and forming an electron emitting portion in said electron emitting portion forming film.
Claim 36
Dependent Claim
26 words
A repairing method according to claim 29, wherein said electron emitting portion is formed by subjecting an electron emitting portion forming film to an electrification process.
Claim 37
Dependent Claim
69 words
A repairing method for an image forming device comprising an electron source, an image forming member for producing an image upon irradiation of an electron beam emitted from said electron source, and modulation means for modulating said electron beam irradiated to said image forming member in accordance with an input image signal, wherein said electron source is repaired by the repairing method according to claim 29 or claim 30.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-07-21 | 2001-01-20 | 2001-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-21 | 2005-01-20 | 2005-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-21 | 2009-01-20 | 2009-07-22 | $7700.00 | Window Closed / Lapsed |