US3894261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No-crossover electron gun
Assignee: Raytheon Co
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Filing: 1973-07-09
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Granted: 1975-07-08
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Expires: 1993-07-09
Abstract
Abstract This invention relates to an electron gun for use in storage, scan converter and vidicon type tubes which have a storage target. This electron gun is characterized by a beam of electrons having an energy distribution approaching that of a ''''MaxwellBoltzman'''' distribution characteristic of the cathode temperature. This energy distribution of the beam electrons is generally achieved by avoiding the crossing over of the beam through the use of a diode accelerating and control section with an apertured control grid operating at a positive potential with respect to the cathode.
Inventors
- 👤 Rayard R Corson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:07
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/46; H01J29/48; H01J29/488
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
An electron gun consisting of a cathode assembly including a metallic sleeve having a closed end at one extremity thereof thereby to provide a planar surface, and electron emissive material on said planar surface, and a heating element within said sleeve for heating said electron emissive surface; a cupshaped electrode disposed concentrically about and substantially coextensive with said sleeve with a centrally disposed aperture surrounding said planar surface means for providing a control electrode having an aperture therein disposed adjacent and parallel to said planar surface for producing an electron beam; and means for providing a plurality of cylindrical accelerating elements about the path of said electron beam.
Claim 2
Dependent Claim
108 words
An electron gun consisting of a cathode assembly including a metallic sleeve having a closed end at one extremity thereof thereby to provide a planar surface, and electron emissive material on said planar surface, and a heating element within said sleeve for heating said electron emissive surface; a cupshaped electrode disposed concentrically about and substantially coextensive with said sleeve with a centrally disposed aperture surrounding said planar surface means for providing a control electrode having an aperture therein disposed adjacent and parallel to said planar surface for producing an electron beam; and means for providing a plurality of cylindrical accelerating elements about the path of said electron beam.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |