GB1480716A - Field shaping magnet structure - Google Patents
Field shaping magnet structureInfo
- Publication number
- GB1480716A GB1480716A GB45422/75A GB4542275A GB1480716A GB 1480716 A GB1480716 A GB 1480716A GB 45422/75 A GB45422/75 A GB 45422/75A GB 4542275 A GB4542275 A GB 4542275A GB 1480716 A GB1480716 A GB 1480716A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- central region
- substantially uniform
- away
- closer together
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
- H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
1480716 Cathode-ray tubes; magnets RAYTHEON CO 31 Oct 1975 [1 Nov 1974] 45422/75 Headings H1D and H1P A magnet structure for producing a region of substantially uniform magnetic field includes a pair of polepieces spaced apart along an axis and oppositely polarized in a direction perpendicular to the axis, and interconnected by a sequence of alternate magnetic members 84 and non-magnetic layers 82, the magnetic members being so arranged that in the end regions 80a of the structure they are spaced progressively closer together the further they are away from the adjacent polepiece, and in a central region 80c of the structure they are spaced progressively closer together the further they are away from the mid-point of the structure. In the cylindrical structure shown, which produces a substantially uniform field throughout the central region 80c, the oppositely radially magnetized annular permanent magnets 76 and 78 are coupled at their outer peripheries by a cylinder 74 of low reluctance material, e.g. cold rolled steel; the magnetic annuli 84 may be of iron, and the non-magnetic annuli 82 of aluminium or air; and the end regions are separated from the central region by intermediate regions 80b formed by one non-magnetic spacer and a magnetic member of increased axial length. Reference is made to the use of an electromagnet rather than a permanent magnet, and a U-shaped, rather than a cylindrical structure, is also disclosed (Fig. 5, not shown). As shown, the structure may provide the focusing field for a proximity focused image intensifier tube which incorporates a channel electron multiplier element 96.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US520074A US3924210A (en) | 1974-11-01 | 1974-11-01 | Field shaping magnet structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1480716A true GB1480716A (en) | 1977-07-20 |
Family
ID=24071096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB45422/75A Expired GB1480716A (en) | 1974-11-01 | 1975-10-31 | Field shaping magnet structure |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3924210A (en) |
| JP (1) | JPS6044780B2 (en) |
| BE (1) | BE834817A (en) |
| CA (1) | CA1027626A (en) |
| CH (1) | CH604345A5 (en) |
| DE (1) | DE2548439C2 (en) |
| FR (1) | FR2290008A1 (en) |
| GB (1) | GB1480716A (en) |
| IL (1) | IL48228A (en) |
| IT (1) | IT1047775B (en) |
| NL (1) | NL172496C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4646045A (en) * | 1985-03-25 | 1987-02-24 | General Electric Company | Aperture sized disc shaped end caps of a ferromagnetic shield for magnetic resonance magnets |
| DE3929475A1 (en) * | 1989-09-05 | 1991-03-14 | Balzers Hochvakuum | METHOD AND DEVICE FOR DEFLECTING A RAY |
| US5949316A (en) * | 1995-08-24 | 1999-09-07 | The United States Of America As Represented By The Secretary Of The Army | Magnetic reluctor structures and methods |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1147461A (en) * | 1955-01-11 | 1957-11-26 | Philips Nv | Magnetic ring magnet system |
| US2942141A (en) * | 1957-06-06 | 1960-06-21 | Bell Telephone Labor Inc | Magnetic structures for traveling wave tubes |
| NL250375A (en) * | 1959-04-13 | |||
| US3227931A (en) * | 1963-07-18 | 1966-01-04 | Zenith Radio Corp | Permanent-magnet uniform-field-producing apparatus |
| GB1020141A (en) * | 1963-10-04 | |||
| GB1066043A (en) * | 1965-02-19 | 1967-04-19 | Standard Telephones Cables Ltd | Magnet arrangement for travelling wave tubes |
| US3404306A (en) * | 1966-04-06 | 1968-10-01 | Alltronics Inc | Traveling-wave tube focusing field straightener |
-
1974
- 1974-11-01 US US520074A patent/US3924210A/en not_active Expired - Lifetime
-
1975
- 1975-09-29 CA CA236,662A patent/CA1027626A/en not_active Expired
- 1975-10-02 IL IL48228A patent/IL48228A/en unknown
- 1975-10-15 IT IT51785/75A patent/IT1047775B/en active
- 1975-10-22 FR FR7532358A patent/FR2290008A1/en active Granted
- 1975-10-23 BE BE161204A patent/BE834817A/en not_active IP Right Cessation
- 1975-10-29 DE DE2548439A patent/DE2548439C2/en not_active Expired
- 1975-10-31 GB GB45422/75A patent/GB1480716A/en not_active Expired
- 1975-10-31 NL NLAANVRAGE7512795,A patent/NL172496C/en not_active IP Right Cessation
- 1975-10-31 JP JP50131350A patent/JPS6044780B2/en not_active Expired
- 1975-10-31 CH CH1411775A patent/CH604345A5/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IL48228A0 (en) | 1975-12-31 |
| US3924210A (en) | 1975-12-02 |
| FR2290008A1 (en) | 1976-05-28 |
| JPS6044780B2 (en) | 1985-10-05 |
| BE834817A (en) | 1976-02-16 |
| FR2290008B1 (en) | 1980-12-05 |
| IT1047775B (en) | 1980-10-20 |
| NL7512795A (en) | 1976-05-04 |
| JPS5167961A (en) | 1976-06-12 |
| DE2548439C2 (en) | 1985-10-31 |
| CH604345A5 (en) | 1978-09-15 |
| IL48228A (en) | 1978-01-31 |
| CA1027626A (en) | 1978-03-07 |
| DE2548439A1 (en) | 1976-05-06 |
| NL172496C (en) | 1983-09-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |