Patent US4829276A successfully refreshed from Google Patents.
US4829276A
Expired / Lapsed
US
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Optimal periodic permanent magnet structure for electron beam focusing tubes
Assignee: United States Department of the Army
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Filing: 1987-03-30
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Granted: 1989-05-09
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Expires: 2007-03-30
Abstract
Abstract In the preferred embodiment a plurality of toroidally shaped magnets of slar size and configuraton are placed in a stack side-by-side in coaxial alignment. Alternate magnets in the stack are magnetized so that the magnetic dipole moment of each is oriented in the radial direction. An axial magnetized toroidal magnet is disposed between each pair of adjacent radially magnetized magnets. The magnetic orientation of the succesive toroidal magnets of the stack rotates continually in one direction in increments of 90° or π/2 radians from the magnet at one end of the stack to that at the other end.
Inventors
- 👤 Herbert A. Leupold
- 👤 Arthur Tauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:20
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/0873; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
A periodic permanent magnet (PPM) structure for the magnetic focusing of the electron beams of electron tube devices comprising a plurality of toroidally shaped permanent magnets of similar size and configuration, said magnets being in coaxial alignment, said magnets being radially magnetized so that the magnetic dipole moment of each is oriented in the radial direction, the magnetic dipole moments of said magnets continually alternating from a radial inward direction to a radial outward direction to a radial inward direction along the longitudinal axis of the stack of permanent magnets, and a toroidally shaped permanent magnet having an axially directed magnetic dipole moment diposed between each pair of adjacent radially magnetized permanent magnets.
Claim 2
Dependent Claim
113 words
A periodic permanent magnet (PPM) structure for the magnetic focusing of the electron beams of electron tube devices comprising a plurality of toroidally shaped permanent magnets of similar size and configuration, said magnets being in coaxial alignment, said magnets being radially magnetized so that the magnetic dipole moment of each is oriented in the radial direction, the magnetic dipole moments of said magnets continually alternating from a radial inward direction to a radial outward direction to a radial inward direction along the longitudinal axis of the stack of permanent magnets, and a toroidally shaped permanent magnet having an axially directed magnetic dipole moment diposed between each pair of adjacent radially magnetized permanent magnets.
Claim 3
Dependent Claim
28 words
A PPM structure as defined in claim 1 wherein the axially directed dipole moments continually alternates in direction along the longitudinal axis of the stack of permanent magnets.
Claim 4
Dependent Claim
39 words
A PPM structure as defined in claim 2 wherein the magnetic orientation of the successive toroidal magnets of the stack rotates continually in one direction in increments of π/2 radians from one end of the stack to the other.
Claim 5
Dependent Claim
49 words
A charged particle beam focusing structure comprising a plurality of similarly sized and shaped toroidal magnets each having a predetermined magnetic dipole moment, said magnets stacked coaxially side-by-side forming a tube so that the magnetic dipole moment of each of said magnets is transverse to each adjacent magnetic orientation.
Claim 6
Dependent Claim
49 words
A charged particle beam focusing structure comprising a plurality of similarly sized and shaped toroidal magnets each having a predetermined magnetic dipole moment, said magnets stacked coaxially side-by-side forming a tube so that the magnetic dipole moment of each of said magnets is transverse to each adjacent magnetic orientation.
Claim 7
Dependent Claim
27 words
A focusing structure as defined in claim 4 wherein the magnetic dipole moment of each of said magnets is substantially perpendicular to each adjacent magnetic dipole moment.
Claim 8
Dependent Claim
29 words
A focusing structure as defined in claim 5 wherein the magnetic dipole moment rotates evenly in 90° increments from one magnet to the next in the stack of magnets.
Claim 9
Dependent Claim
25 words
A focusing structure as defined in claim 4 wherein said magnets are formed of a samarium cobalt SmCo 5 or Sm 2 Co 17 composition.
Claim 10
Dependent Claim
112 words
Apparatus for performing magnetic focusing of electron beams in traveling wave tubes and the like comprising: a stack of substantially equally sized toroid shaped permanent magnets abutted end-to-end along their axis of symmetry, said stack comprising: a first plurality of toroids having a magnetic orientation substantially colinear with the axis of symmetry; and a second plurality of toroids having a magnetic orientation which is radial with respect to said axis of symmetry, said first and second plurality of toroids being alternated with each other and arranged so that the magnetic orientation of the toroids within said stack rotates evenly in π/2 increments from one end of said stack to the other end.
Claim 11
Dependent Claim
112 words
Apparatus for performing magnetic focusing of electron beams in traveling wave tubes and the like comprising: a stack of substantially equally sized toroid shaped permanent magnets abutted end-to-end along their axis of symmetry, said stack comprising: a first plurality of toroids having a magnetic orientation substantially colinear with the axis of symmetry; and a second plurality of toroids having a magnetic orientation which is radial with respect to said axis of symmetry, said first and second plurality of toroids being alternated with each other and arranged so that the magnetic orientation of the toroids within said stack rotates evenly in π/2 increments from one end of said stack to the other end.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |