JPS5852647U

JPS5852647U - electromagnetic drive device

Info

Publication number: JPS5852647U
Application number: JP14930081U
Authority: JP
Inventors: 文昭田辺; 遠藤　渥
Original assignee: ティアック株式会社
Priority date: 1981-10-06
Filing date: 1981-10-06
Publication date: 1983-04-09
Also published as: JPS639862Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の実施例に係わる光学式ビデオディスク
レコーダを示すブロック図、第２図は従来のフォーカス
制御機構の一部を示す断面図、第３図は第２図の一部平
面図、第４図は本考案の実施例に係わるフォー力支制御
機構の一部切断斜視図、第５図は第４図の一部拡大斜視
図、〜第６図は第４図の磁石部分の拡大断面図、第７図
は本考案　　−の別の実施例に係わる回り止め機構の一
部を示す斜視図、第８図は第７図の電磁石の制御方式を
示すブロック図である。Fig. 1 is a block diagram showing an optical video disc recorder according to an embodiment of the present invention, Fig. 2 is a sectional view showing a part of a conventional focus control mechanism, and Fig. 3 is a partial plan view of Fig. 2. , FIG. 4 is a partially cutaway perspective view of the four force support control mechanism according to the embodiment of the present invention, FIG. 5 is a partially enlarged perspective view of FIG. 4, and FIGS. FIG. 7 is an enlarged sectional view, FIG. 7 is a perspective view showing a part of a detent mechanism according to another embodiment of the present invention, and FIG. 8 is a block diagram showing a control system for the electromagnet shown in FIG.

Claims

[Claims for Utility Model Registration] (1) A magnet, a drive coil disposed in a magnetic field applied by the magnet and formed to be displaced in response to changes in current, and a moving direction of the drive coil. a driven body having a cylindrical or columnar shaft extending in the direction of the shaft and coupled to the drive coil so as to be displaced in accordance with the displacement of the drive coil; a support body having a microgap forming surface that surrounds the shaft portion or having a microgap surrounded by the shaft portion; the microgap forming surface of the support body and the shaft portion of the driven body; a gas supply unit that supplies gas to the minute gap so as to maintain a minute gap between the driven body side magnetic attraction or repulsion unit supported by the driven body, and a support supported by the support body; a body-side magnetic attraction or repulsion section, and prevents the driven body from rotating by an attraction or repulsion force generated between the driven body side magnetic attraction or repulsion section and the support body side magnetic attraction or repulsion section; An electromagnetic drive device equipped with a mechanism and. Drive device. (2) The driven body side magnetic attraction or repulsion part is a driven body side permanent magnet having an N pole (!: S pole) in the rotational direction of the driven body, and the support body side magnetic attraction or repulsion part is a driven body side permanent magnet having an N pole (!: S pole) in the rotation direction of the driven body. a first support-side permanent magnet having an N pole disposed opposite to the N pole of the driving body-side permanent magnet; and a second support body-side permanent magnet having an S pole facing the S pole of the driven body-side permanent magnet. The electromagnetic drive device according to claim 1 of the utility model registration claim, which comprises a permanent magnet on the body side.(3) The driven body side magnetic attraction or repulsion part is a magnetic piece protruding in the radial direction of the driven body. The support side attracting or repelling part includes a first electromagnet disposed on one side of the magnetic body piece and the magnetic body, and a magnetic substance disposed on the other side of the body piece and caused by the first electromagnet. 2. The electromagnetic drive device according to claim 1, which comprises a second electromagnet that is energized to attract or repel the magnetic piece in opposition to the attraction or repulsion of the magnetic piece.