JPH01146781U

JPH01146781U -

Info

Publication number: JPH01146781U
Application number: JP3476388U
Authority: JP
Priority date: 1988-03-15
Filing date: 1988-03-15
Publication date: 1989-10-11

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す断面正面図、
第２図は拡大要部断面図、第３図は変形例を示す
拡大要部断面図、第４図は他の実施例を示す拡大
要部断面図、第５図は変形例を示す拡大要部断面
図である。第６図は従来例を示す断面正面図であ
る。１……ハブ、２……磁気デイスク、３……回転
軸、４……軸受、５……モータブラケツト、６…
…円筒ボス部、１５……導電性保持部材、１６…
…一端面、１７……間隙、１８……小マグネツト
、１９……磁性材部、２０……空隙部、２１……
磁性流体。 FIG. 1 is a cross-sectional front view showing an embodiment of the present invention;
Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is an enlarged sectional view of the main part showing a modification, Fig. 4 is an enlarged sectional view of the main part showing another embodiment, and Fig. 5 is an enlarged sectional view of the main part showing a modification. FIG. FIG. 6 is a sectional front view showing a conventional example. 1...Hub, 2...Magnetic disk, 3...Rotating shaft, 4...Bearing, 5...Motor bracket, 6...
... Cylindrical boss part, 15 ... Conductive holding member, 16 ...
...One end surface, 17...Gap, 18...Small magnet, 19...Magnetic material part, 20...Gap part, 21...
magnetic fluid.

Claims

[Claims for Utility Model Registration] In a spindle motor in which a rotating shaft 3 is supported by a cylindrical boss portion 6 of a motor bracket 5 via one or more bearings 4 and rotates, one end surface 16 of the rotating shaft 3. A predetermined gap 17
A conductive holding member 15 is provided on the cylindrical boss portion 6 so as to face the one end face 16 and the holding member 1.
A small magnet 18 is provided on either one of the magnets 5 and the other is a magnetic material portion 19, and a magnetic fluid 21 is provided in the gap 20 between the small magnet 18 and the magnetic material portion 19.
A spindle motor characterized by holding.