JPH01181103U

JPH01181103U -

Info

Publication number: JPH01181103U
Application number: JP7660888U
Authority: JP
Priority date: 1988-06-09
Filing date: 1988-06-09
Publication date: 1989-12-27

Description

[Brief explanation of the drawing]

第１図はこの考案の実施例装置を示す斜視図、
第２図および第３図は実施例装置の互いに異なる
方向の断面図、第４図、第５図、および第６図は
実施例装置における垂直磁束の磁束密度分布を互
いに異なる方向について示す特性線図、第７図は
光磁気記録装置の要部を示す構成図、第８図およ
び第９図は従来装置を示す斜視図および断面図、
第１０図、第１１図、および第１２図は従来装置
における垂直磁束密度の分布を互いに異なる方向
について示す特性線図である。１…電磁石、２…励磁コイル、３…コア、４…
継鉄、４Ａ，４Ｂ…リツプ、５，１５…主磁極、
５Ａ…磁極面、１５Ａ…拡張された磁極面、１５
Ｂ…延出部、１０…垂直磁束、２０…光磁気デイ
スク、２１…情報記録層、３０…光学ヘツド、５
０…微小スポツト。 FIG. 1 is a perspective view showing an embodiment of the device of this invention;
2 and 3 are cross-sectional views of the example device in different directions, and FIGS. 4, 5, and 6 are characteristic lines showing the magnetic flux density distribution of vertical magnetic flux in the example device in different directions. 7 is a configuration diagram showing the main parts of a magneto-optical recording device, FIGS. 8 and 9 are a perspective view and a sectional view showing a conventional device,
FIG. 10, FIG. 11, and FIG. 12 are characteristic diagrams showing the distribution of vertical magnetic flux density in different directions in the conventional device. 1... Electromagnet, 2... Excitation coil, 3... Core, 4...
Yoke, 4A, 4B... lip, 5, 15... main magnetic pole,
5A...Magnetic pole surface, 15A...Extended magnetic pole surface, 15
B... Extension portion, 10... Perpendicular magnetic flux, 20... Magneto-optical disk, 21... Information recording layer, 30... Optical head, 5
0...Minute spot.

Claims

[Scope of utility model registration request]

A yoke of a predetermined length having a groove-shaped cross section with a lip bent so that the end faces of the U-shaped opening side face each other, and a yoke of a predetermined length that protrudes from the bottom of the groove of this yoke toward the opening. A main magnetic pole is formed such that a predetermined gap is maintained between the main magnetic pole and the end surface of the lip, and the rectangular end surface as a magnetic pole surface is substantially flush with the surface of the lip, and the groove surrounding the main magnetic pole is formed. an excitation coil that is wound around a main magnetic pole so as to fit within the main magnetic pole, and is arranged so that the magnetic pole face faces one side of the magneto-optical recording medium, and applies a perpendicular magnetic field to a predetermined area of the information recording section. An electromagnet for an external magnetic field applying device, characterized in that the magnetic pole surface side of the main pole is extended laterally in a brim shape so as to cover an excitation coil, thereby forming an expanded magnetic pole surface.