JPH0315452U - - Google Patents
Info
- Publication number
- JPH0315452U JPH0315452U JP7652389U JP7652389U JPH0315452U JP H0315452 U JPH0315452 U JP H0315452U JP 7652389 U JP7652389 U JP 7652389U JP 7652389 U JP7652389 U JP 7652389U JP H0315452 U JPH0315452 U JP H0315452U
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- center hole
- pair
- yoke plates
- magnetic flux
- 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
- 230000004907 flux Effects 0.000 claims 3
- 238000010894 electron beam technology Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は実施例の電磁フオーカスコイル２１を
示す斜視図、第２図は電磁フオーカスコイル２１
の構成の説明に供する分解図、第３図は電磁フオ
ーカス回路２０の説明に供する回路図、第４図及
び第５図は電磁フオーカスコイル２１の他の実施
例を示す斜視図、第６図はヨークプレートの他の
実施例を示す斜視図、第７図は従来の電磁フオー
カスコイル１０を示す斜視図、第８図は従来の電
磁フオーカスコイル１０の説明に供する断面図、
第９図は従来の電磁フオーカ回路１の説明に供す
る回路図、第１０図は電磁フオーカスコイル１０
内に生ずる磁束φの周波数特性を示す特性曲線図
、第１１図は電磁フオーカスコイル１０の等価回
路を示す略線図である。
２０……電磁フオーカス回路、２１……電磁フ
オーカスコイル、２２，２３ＡＸ，２３ＢＸ，２
４Ｘ……スリツト、２３Ａ，２３Ｂ……ヨークプ
レート、２４……マグネツト、２５……電磁コイ
ル。
FIG. 1 is a perspective view showing the electromagnetic focus coil 21 of the embodiment, and FIG. 2 is a perspective view of the electromagnetic focus coil 21.
3 is a circuit diagram for explaining the electromagnetic focus circuit 20, FIGS. 4 and 5 are perspective views showing other embodiments of the electromagnetic focus coil 21, and FIG. 7 is a perspective view showing another embodiment of the yoke plate, FIG. 7 is a perspective view showing a conventional electromagnetic focus coil 10, and FIG. 8 is a cross-sectional view for explaining the conventional electromagnetic focus coil 10.
FIG. 9 is a circuit diagram for explaining a conventional electromagnetic focuser circuit 1, and FIG. 10 is an electromagnetic focus coil 10.
FIG. 11 is a schematic diagram showing an equivalent circuit of the electromagnetic focus coil 10. FIG. 20... Electromagnetic focus circuit, 21... Electromagnetic focus coil, 22, 23AX, 23BX, 2
4X...slit, 23A, 23B... yoke plate, 24... magnet, 25... electromagnetic coil.
Claims (1)
電磁コイルを巻回し、上記マグネツトの両端面に
一対の環板状のヨークプレートを積層し、中心孔
内に発生した集束磁束によつて当該中心孔を通る
電子ビームを集束させるようにしてなる電磁フオ
ーカスコイルにおいて、 上記マグネツトの一部に上記集束磁束に基づい
て上記マグネツトの中心孔の周囲に生ずる誘導電
流の短絡路を切るように形成された第１のスリツ
トと、 上記一対のヨークプレートの一部に上記集束磁
束に基づいて上記一対のヨークプレートの中心孔
の周囲に生ずる誘導電流の短絡路を切るように形
成された第２及び第３のスリツトと、 を設けたことを特徴とする電磁フオーカスコイ
ル。[Claims for Utility Model Registration] An annular magnet, an electromagnetic coil wound around the inside of the magnet, a pair of annular plate-shaped yoke plates laminated on both end faces of the magnet, and a focused magnetic flux generated in the center hole. Therefore, in an electromagnetic focus coil configured to focus an electron beam passing through the center hole, a short circuit of an induced current generated around the center hole of the magnet is cut in a part of the magnet based on the focused magnetic flux. a first slit formed in the above-mentioned pair of yoke plates, and a first slit formed in a part of the pair of yoke plates so as to cut a short circuit of an induced current generated around the center hole of the pair of yoke plates based on the focused magnetic flux. An electromagnetic focus coil characterized by having second and third slits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7652389U JPH0315452U (en) | 1989-06-29 | 1989-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7652389U JPH0315452U (en) | 1989-06-29 | 1989-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0315452U true JPH0315452U (en) | 1991-02-15 |
Family
ID=31618071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7652389U Pending JPH0315452U (en) | 1989-06-29 | 1989-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0315452U (en) |
-
1989
- 1989-06-29 JP JP7652389U patent/JPH0315452U/ja active Pending
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