JPS5583210A - Magnetic unit pole piece - Google Patents
Magnetic unit pole pieceInfo
- Publication number
- JPS5583210A JPS5583210A JP15885978A JP15885978A JPS5583210A JP S5583210 A JPS5583210 A JP S5583210A JP 15885978 A JP15885978 A JP 15885978A JP 15885978 A JP15885978 A JP 15885978A JP S5583210 A JPS5583210 A JP S5583210A
- Authority
- JP
- Japan
- Prior art keywords
- plane
- angle
- pole piece
- magnetic field
- faces
- 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.)
- Granted
Links
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
PURPOSE: To greatly enhance magnetic field uniformity in pole pieces having a logarithmically curved surface by using a special angle θf between its plane and the point of contact.
CONSTITUTION: A pole piece 1 is on core 3 spaced by pure iron spacer 2. The leading edge plane 1a with diameter df faces the opposing pole piece. Outer periphery near the plane 1a is machined in the logarithmically curved surface 1b which is specially calculated, and the angle θf formed by two faces is set to about 2.5W4°. In machining, when the angle θf has reached a specified value, the curved face 1b is cut into either plane face, or conical plane 1c having an angle θf. This structure allows magnetic field distribution to have small and stabilized 2nd and 4th coefficients and each aberration to have minimum dependency on Z. The obtained magnetic field is easy to correct by a device such as a shim coil, thus resulting in an equipment with a highly uniform megnetic field.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53158859A JPS5949681B2 (en) | 1978-12-19 | 1978-12-19 | Pole piece for magnet device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53158859A JPS5949681B2 (en) | 1978-12-19 | 1978-12-19 | Pole piece for magnet device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5583210A true JPS5583210A (en) | 1980-06-23 |
JPS5949681B2 JPS5949681B2 (en) | 1984-12-04 |
Family
ID=15680953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53158859A Expired JPS5949681B2 (en) | 1978-12-19 | 1978-12-19 | Pole piece for magnet device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5949681B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5315279A (en) * | 1990-02-27 | 1994-05-24 | Tdk Corporation | Coil device |
US6211765B1 (en) | 1990-02-27 | 2001-04-03 | Tdk Corporation | Coil device |
KR100423775B1 (en) * | 2002-02-27 | 2004-03-30 | (주)에스시엠아이 | Magnetic pole of electro magnet for forming equalized magnetic field |
-
1978
- 1978-12-19 JP JP53158859A patent/JPS5949681B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5315279A (en) * | 1990-02-27 | 1994-05-24 | Tdk Corporation | Coil device |
US6211765B1 (en) | 1990-02-27 | 2001-04-03 | Tdk Corporation | Coil device |
KR100423775B1 (en) * | 2002-02-27 | 2004-03-30 | (주)에스시엠아이 | Magnetic pole of electro magnet for forming equalized magnetic field |
Also Published As
Publication number | Publication date |
---|---|
JPS5949681B2 (en) | 1984-12-04 |
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