US3852637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun structure with unipotential and bipotential lens
Assignee: Hitachi Ltd
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Filing: 1972-01-25
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Granted: 1974-12-03
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Expires: 1992-01-25
Abstract
Abstract An electron gun structure having a main focusing lens including a unipotential electron lens and a bipotential electron lens, the unipotential and bipotential electron lenses serving as a single main electron lens having a larger effective aperture thereby greatly reducing aberration.
Inventors
- 👤 E Yamazaki
- 👤 H Kanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:01
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J3/029; H01J29/00; H01J29/46; H01J29/48; H01J29/488
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
In an electron gun structure having a plurality of electrodes for focusing an electron beam on a screen, the improvement comprising a main focusing lens assembly comprising first electrode means for forming a unipotential electron lens and second electrode means for forming a bipotential electron lens.
Claim 2
Dependent Claim
46 words
In an electron gun structure having a plurality of electrodes for focusing an electron beam on a screen, the improvement comprising a main focusing lens assembly comprising first electrode means for forming a unipotential electron lens and second electrode means for forming a bipotential electron lens.
Claim 3
Dependent Claim
88 words
The electron gun structure as defined in claim 1, wherein said first electrode means includes first, second and third electrodes and said second electrode means includes said third electrode and a fourth electrode, said first, second, third and fourth electrodes being arranged on a common axis in order, said first and third electrodes being electrically connected to each other and supplied with a common high potential and each of said second and fourth electrodes being supplied with a potential lower than that of said first and third electrodes.
Claim 4
Dependent Claim
28 words
The electron gun structure as defined in claim 2, wherein said second and fourth electrodes are electrically connected to each other and are supplied with a common potential.
Claim 5
Dependent Claim
24 words
The electron gun structure as defined in claim 2, wherein said second and fourth electrodes are supplied with individual potentials different from each other.
Claim 6
Dependent Claim
88 words
The electron gun structure as defined in claim 1, wherein said first electrode means includes second, third and fourth electrodes and said second electrode means includes a first electrode and said second electrode, said first, second, third and fourth electrodes being arranged on a common axis in order, said second and fourth electrodes being electrically connected to each other and supplied with a common high potential and each of said first and third electrodes being supplied with a potential lower than that of said second and fourth electrodes.
Claim 7
Dependent Claim
28 words
The electron gun structure as defined in claim 5, wherein said first and third electrodes are electrically connected to each other and are supplied with a common potential.
Claim 8
Dependent Claim
24 words
The electron gun structure as defined in claim 5, wherein said first and third electrodes are supplied with individual potentials different from each other.
Claim 9
Dependent Claim
20 words
The electron gun structure as defined in claim 2, wherein said third and fourth electrodes are of substantially equal diameter.
Claim 10
Dependent Claim
20 words
The electron gun structure as defined in claim 5, wherein said first and second electrodEs are of substantially equal diameter.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |