JPH0313659U - - Google Patents
Info
- Publication number
- JPH0313659U JPH0313659U JP7417089U JP7417089U JPH0313659U JP H0313659 U JPH0313659 U JP H0313659U JP 7417089 U JP7417089 U JP 7417089U JP 7417089 U JP7417089 U JP 7417089U JP H0313659 U JPH0313659 U JP H0313659U
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- magnet
- shaped yoke
- hollow
- focus
- 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
Description
第１図は本考案の実施例を示す要部縦断面図、
第２図はフオーカスマグネツトの軸方向位置と中
心磁束密度との関係を示す図、第３図は従来のも
のの一例を示す要部縦断面図である。
１１，１２，１３：永久磁石、２１，２２：ヨ
ーク。
FIG. 1 is a vertical sectional view of the main part showing an embodiment of the present invention.
FIG. 2 is a diagram showing the relationship between the axial position of the focus magnet and the central magnetic flux density, and FIG. 3 is a longitudinal cross-sectional view of a main part showing an example of a conventional one. 11, 12, 13: permanent magnet, 21, 22: yoke.
Claims (1)
円筒状の永久磁石の端面に強磁性材料からなる中
空円板状のヨークを同軸的に固着すると共に、永
久磁石の内面に中心磁界調整用のコイルを同軸的
に配設してなるフオーカスマグネツトにおいて、
３個の永久磁石を異極を対向させ、かつ強磁性材
料からなる中空円板状のヨークを介して同軸上に
接続し、 Ｂ１Ｂ３＜Ｂ２ 但しＢ１，Ｂ３：端部の永久磁石の中心磁束密
度 Ｂ２：中間部の永久磁石の中心磁束密度 に形成したことを特徴とするフオーカスマグネ
ツト。 (2) 永久磁石間に介装させる中空円板状のヨー
クが軸と直交する分割平面を有する請求項(1)記
載のフオーカスマグネツト。[Claims for Utility Model Registration] (1) A hollow disk-shaped yoke made of a ferromagnetic material is fixed coaxially to the end face of a hollow cylindrical permanent magnet that is axially magnetized and has magnetic poles on its end face. In addition, in a focus magnet in which a coil for adjusting the central magnetic field is coaxially arranged on the inner surface of a permanent magnet,
Three permanent magnets with different poles facing each other are coaxially connected via a hollow disc-shaped yoke made of ferromagnetic material, and B 1 B 3 <B 2 where B 1 , B 3 : At the end A focus magnet characterized in that the center magnetic flux density of the permanent magnet is B2 : the center magnetic flux density of the permanent magnet in the intermediate part. (2) The focus magnet according to claim (1), wherein the hollow disk-shaped yoke interposed between the permanent magnets has a dividing plane perpendicular to the axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7417089U JPH0313659U (en) | 1989-06-23 | 1989-06-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7417089U JPH0313659U (en) | 1989-06-23 | 1989-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0313659U true JPH0313659U (en) | 1991-02-12 |
Family
ID=31613634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7417089U Pending JPH0313659U (en) | 1989-06-23 | 1989-06-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0313659U (en) |
-
1989
- 1989-06-23 JP JP7417089U patent/JPH0313659U/ja active Pending
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