Patent US3932786A successfully refreshed from Google Patents.
US3932786A
Expired / Lapsed
US
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Electron gun with a multi-element electron lens
Assignee: RCA Licensing Corp
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Filing: 1974-11-29
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Granted: 1976-01-13
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Expires: 1994-11-29
Abstract
Abstract The disclosed apparatus is a multiple beam electron gun having a wide focusing lens gap. The lens gap has a plurality of metal elements, spaced therein, each successive element of which has a successively greater voltage applied to it. The application of the voltages creates an electrostatic field which focuses a plurality of beams generated by the gun.
Inventors
- 👤 Francis Joseph Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:48
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503; H01J29/488
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
In an electron gun structure for producing and directing at least one electron beam along a beam path, said gun including a cathode, a control grid electrode, a screen grid electrode, a first accelerating and focusing electrode and a second accelerating and focusing electrode, spaced respectively along the beam path, the improvement comprising: a plurality of spaced electrode plates positioned between said first focusing and accelerating electrode and said second focusing and accelerating electrode for expanding the focusing lens fields in the path of the beam, each plate having an aperture therethrough aligned with said beam path; supporting means connecting said electrode plates; and resistive means attached at one end to said first accelerating and focusing electrode and at a second end to said second focusing and accelerating electrode and attached to said spaced electrode plates at spaced points between the ends of said resistive means, said resistive means being on said support means.
Claim 2
Dependent Claim
154 words
In an electron gun structure for producing and directing at least one electron beam along a beam path, said gun including a cathode, a control grid electrode, a screen grid electrode, a first accelerating and focusing electrode and a second accelerating and focusing electrode, spaced respectively along the beam path, the improvement comprising: a plurality of spaced electrode plates positioned between said first focusing and accelerating electrode and said second focusing and accelerating electrode for expanding the focusing lens fields in the path of the beam, each plate having an aperture therethrough aligned with said beam path; supporting means connecting said electrode plates; and resistive means attached at one end to said first accelerating and focusing electrode and at a second end to said second focusing and accelerating electrode and attached to said spaced electrode plates at spaced points between the ends of said resistive means, said resistive means being on said support means.
Claim 3
Dependent Claim
43 words
The device as in claim 1 wherein said device includes: a plurality of cathodes for producing a plurality of electron beams; and each of said spaced electrode plates having a plurality of apertures therethrough, each aperture being aligned with a respective beam path.
Claim 4
Dependent Claim
16 words
The device as in claim 1 wherein said resistive means comprises a thin film cermet resistor.
Claim 5
Dependent Claim
22 words
The device as in claim 1 wherein the cathode, electrodes and electrode plates are mounted between a plurality of parallel support rods.
Claim 6
Dependent Claim
18 words
The device as in claim 4 wherein the resistive means is mounted on one of said support rods.
Claim 7
Dependent Claim
30 words
The device as in claim 5 wherein the resistive means comprises a thin film cermet resistor bonded to a substrate, said substrate being mounted on one of said support rods.
Claim 8
Dependent Claim
31 words
The device as in claim 1 wherein said spaced electrode plates are connected to the resistive means so that the resistance between said spaced electrode plates is proportional to their spacing.
Claim 9
Dependent Claim
31 words
The device as in claim 1 wherein said spaced electrode plates are connected to the resistive means so that the resistance between said spaced electrode plates is disproportional to their spacing.
References Cited (Backward Citations)
US2143390A
Cited
US2859378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |