JPH01307943A - Magneto-optical recording/reproducing and erasing device - Google Patents
Magneto-optical recording/reproducing and erasing deviceInfo
- Publication number
- JPH01307943A JPH01307943A JP14103788A JP14103788A JPH01307943A JP H01307943 A JPH01307943 A JP H01307943A JP 14103788 A JP14103788 A JP 14103788A JP 14103788 A JP14103788 A JP 14103788A JP H01307943 A JPH01307943 A JP H01307943A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- leakage magnetic
- recording
- disk
- optical
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は光ビームによって情報の記録、再生、及び消
去を行なう光磁気記録再生消去装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical recording/reproducing/erasing device that records, reproduces, and erases information using a light beam.
［従来の技術］
従来このようなものとして、例えば特開昭６１１０４４
４３号公報に記載のものがあるが、ここでは第２図と第
３図を用いて従来装置の一般的な構成を説明する。第２
図は斜視図、第３図は断面構成図である。 図において
、（１）は情報の記録担体となる光ディスク、（２）は
光ディスク（１）を回転させるディスクモータ、（３）
は光ディスク（１）に対し光ビームを用いて情報の記録
、再生、及び消去を行なう光ヘッド、（４）は光ヘッド
（３）の一部を構成し、光ビームを光ディスク（１）の
記録面上に集光する集光レンズ、（５）は集光レンズ（
４）を光ディスク（＋）に垂直な方向（以下フォーカス
方向と呼ぶ）と光ディスク（１）の半径方向（以下トラ
ッキング方向と呼ぶ）の２軸方向に微小駆動する集光レ
ンズアクチュエータ、（６）は情報の記録、及び消去時
に、光ディスク（１）の記録面上の集光スポット部にバ
イアス磁界を印加する励磁素子、（７ａ）（７ｂ）（７
ｃ）（７ｄ） （総称するときは（７））は光ヘッド（
３）ニ取り付けられたベアリング、（８ａ）（８ｂ）
（総称するときは（８））はベアリング（７）と係合し
て光ヘッド（３）を光ディスク（１）の半径方向に移動
可能に支持するガイドレール、（９）は光ヘッド（３）
に取り付けられたりニアモータコイル、（１０ａ）（１
０ｂ） （総称するときは（１０））はりニアモータコ
イル（９）とともに光ヘッド（３）を光ディスク（１）
の半径方向に駆動させるためのりニアモータを構成する
りニアモータ磁気回路、（１１）は装置各構成部品の取
付台となるベースである。[Prior art] Conventionally, as such a device, for example, Japanese Patent Application Laid-Open No. 611044
Although there is a device described in Japanese Patent No. 43, the general configuration of the conventional device will be explained here with reference to FIGS. 2 and 3. Second
The figure is a perspective view, and FIG. 3 is a cross-sectional configuration diagram. In the figure, (1) is an optical disk that serves as an information recording carrier, (2) is a disk motor that rotates the optical disk (1), and (3) is a disk motor that rotates the optical disk (1).
is an optical head that records, reproduces, and erases information on the optical disk (1) using a light beam, and (4) constitutes a part of the optical head (3), and uses the light beam to record information on the optical disk (1). A condensing lens that condenses light onto a surface, (5) is a condensing lens (
4) is a condensing lens actuator that minutely drives the optical disc (+) in two axial directions: the direction perpendicular to the optical disc (+) (hereinafter referred to as the focus direction) and the radial direction of the optical disc (1) (hereinafter referred to as the tracking direction); Excitation elements (7a) (7b) (7) that apply a bias magnetic field to a focused spot on the recording surface of the optical disk (1) when recording and erasing information.
c) (7d) ((7) when used collectively) is an optical head (
3) D-installed bearings, (8a) (8b)
((8) when referred to collectively) is a guide rail that engages with a bearing (7) and supports the optical head (3) so as to be movable in the radial direction of the optical disk (1); (9) is the optical head (3);
Near motor coil, (10a) (1
0b) (Generally referred to as (10)) The optical head (3) is connected to the optical disk (1) along with the linear motor coil (9).
A linear motor magnetic circuit constitutes a linear motor for driving the linear motor in the radial direction, and (11) is a base on which each component of the device is mounted.
次に動作について説明する。Next, the operation will be explained.
光磁気記録は一般に、レーザ光源から出射されるレーザ
光を集光レンズ（４）によって光ディスク（１）の記録
媒体面（磁化層）（以下、記録面と記す） （ｌａ）上
に集光し、媒体温度を上昇せると同時に、励磁素子（６
）によりバイアス磁界を印加し、バイアス磁界方向に磁
化された磁圧を残すことで信号を記録する。消去はこの
逆方向のバイアス磁界を印加することで行なう。光ディ
スク（りは回転中、面振れ（フォーカス方向の振れ）や
トラック振れ（トラッキング方向の振れ）を生じる。集
光レンズアクチュエータ（５）は集光レンズ（４）をボ
イスコイルモータにより、フォーカス方向、トラッキン
グ方向の二方向に微小駆動し、面振れやトラック振れに
追従して光ビームを光ディスク（１）上の所望の位置に
集光させる。またリニアモータコイル（９）とりニアモ
ータ磁気回路（１０）により構成されるリニアモータは
、集光レンズアクチュエータ（５）を搭載した光ヘッド
（３）を光ディスク（１）の半径方向に大きく駆動し、
光ディスク（１）の内周から外周までの記録、再生、及
び消去を可能にする。Magneto-optical recording generally focuses laser light emitted from a laser light source onto a recording medium surface (magnetized layer) (hereinafter referred to as recording surface) (la) of an optical disk (1) using a condensing lens (4). , while increasing the medium temperature, the excitation element (6
), a bias magnetic field is applied, and a signal is recorded by leaving a magnetized magnetic pressure in the direction of the bias magnetic field. Erasing is performed by applying a bias magnetic field in the opposite direction. During rotation of an optical disk, surface wobbling (wobble in the focus direction) and track wobbling (wobble in the tracking direction) occur.The condenser lens actuator (5) moves the condenser lens (4) in the focus direction, The light beam is focused on a desired position on the optical disk (1) by minutely driving in two directions in the tracking direction, following the surface runout and track runout.Also, the linear motor coil (9) and the linear motor magnetic circuit (10) The linear motor configured by drives an optical head (3) equipped with a condensing lens actuator (5) largely in the radial direction of the optical disk (1),
It enables recording, reproduction, and erasing from the inner circumference to the outer circumference of the optical disc (1).
［発明が解決しようとする課題］
従来の光磁気記録再生消去装置は以上のように構成され
ていたので集光レンズアクチュエータ部、リニアモータ
部、及びディスクモータのクランプ部等に用いられてい
る磁気回路から、漏洩磁界が発生しており・ 光デイス
ク記録面上の集光部においても、それらが重ね合わされ
た形で漏洩磁界が存在する。この集光部における漏洩磁
界の記録面に垂直な方向の成分により、記録、及び消去
時に必要なバイアス磁界にオフセットが生じるため、記
録時あるいは消去時のどちらかでオフセットをキャンセ
ルするための余分なバイアス磁界を印加する必要があっ
た。従って、励磁素子の負担が大きくなるという問題が
あった。[Problems to be Solved by the Invention] Since the conventional magneto-optical recording/reproducing/erasing device was constructed as described above, the magnetic A leakage magnetic field is generated from the circuit, and a leakage magnetic field exists in the form of a superposition of these fields at the light condensing section on the optical disk recording surface. This component of the leakage magnetic field in the direction perpendicular to the recording surface in the light condensing section causes an offset in the bias magnetic field necessary for recording and erasing, so an extra It was necessary to apply a bias magnetic field. Therefore, there is a problem in that the load on the excitation element increases.
しかし、従来の光磁気記録再生消去装置では各磁気回路
に組み込まれている永久磁石の極性の組合せを考慮して
いなつかったため、最悪の場合、各磁気回路からの漏洩
磁界の、光デイスク記録面に垂直な方向の成分の向きが
同一となってしまい、バイアス磁界のオフセットが最大
となってしまうという問題があった。これを第４図（ａ
）（ｂ）を用いて説明する。図中、矢印は矢印の向きが
磁Ｗの向き、長さが大きさを表わしているものとする。However, since conventional magneto-optical recording/reproducing/erasing devices do not take into account the combination of polarities of the permanent magnets built into each magnetic circuit, in the worst case, the leakage magnetic field from each magnetic circuit may be applied to the optical disk recording surface. There is a problem in that the directions of the components in the direction perpendicular to the direction become the same, and the offset of the bias magnetic field becomes maximum. This is shown in Figure 4 (a
) (b). In the figure, the direction of the arrow represents the direction of the magnetic W, and the length represents the size.
励磁素子（６）によるバイアス磁界は、記録時（第４図
（ａ））では矢印（１２ａ）、消去時（第４図（＋））
）では矢印（＋２ｂ）のように逆向きに印加される。The bias magnetic field generated by the excitation element (6) is shown by the arrow (12a) during recording (Fig. 4(a)) and by the arrow (12a) during erasing (Fig. 4(+)).
), the voltage is applied in the opposite direction as indicated by the arrow (+2b).
オフセットの原因となる漏洩磁界の、記録面（ｌａ）に
垂直な方向の成分（以後、トータルの漏洩磁界と呼ぶ）
（＋６）は記録、消去に無関係に、図示の向きにかか
り、集光レンズアクチュエータ磁気回路からの漏洩磁界
の、記録面（ｌａ）に垂直な方向の成分く以後、 集
光レンズアクチュエータ漏洩磁界と呼ぶ） （１３）と
、リニアモータ磁気回路からの漏洩磁界の、記録面（１
ａ）に垂直な方向の成分く以後、リニアモータ漏洩磁界
と呼ぶ） （＋４）と、ディスクモータのクランプ部磁
気回路からの８洩磁界の、記録面（ｌａ）に垂直な方向
の成分（以後、ディスククランプ漏洩磁Ｗと呼ぶ） （
１５）との和である。今、集光レンズアクチュエータ漏
洩磁界（１３）とりニアモータ漏洩磁界（１４）とディ
スククランプ漏洩磁界（１５）は同一方向を向いており
、漏洩磁界が農大となっているとすると、第４図（ａＸ
ｂ）かられかるように、消去時には記録面に充分な磁界
（＋７ｂ）が印加できるが、記録時には小さな磁界（１
７ａ） Ｌ／か印加できず、不足分を励磁素子により補
わなければならず、励磁素子の負担が大きく、しいては
装置の小型化が図れないという問題を生じる。The component of the leakage magnetic field that causes offset in the direction perpendicular to the recording surface (la) (hereinafter referred to as the total leakage magnetic field)
(+6) is applied in the direction shown in the figure regardless of recording or erasing, and after the component of the leakage magnetic field from the condenser lens actuator magnetic circuit in the direction perpendicular to the recording surface (la), the condenser lens actuator leakage magnetic field and (13) and the recording surface (1) of the leakage magnetic field from the linear motor magnetic circuit.
(hereinafter referred to as the linear motor leakage magnetic field) (+4), and the component (hereinafter referred to as the linear motor leakage magnetic field) of the 8 leakage magnetic field from the magnetic circuit of the clamp portion of the disk motor in the direction perpendicular to the recording surface (la). , called disk clamp leakage magnetic W) (
15). Now, if we assume that the condensing lens actuator leakage magnetic field (13), the near motor leakage magnetic field (14), and the disk clamp leakage magnetic field (15) are oriented in the same direction, and the leakage magnetic field is at the agricultural university, Fig. 4 (aX
As shown in b), a sufficient magnetic field (+7b) can be applied to the recording surface during erasing, but a small magnetic field (+7b) can be applied during recording.
7a) It is not possible to apply L/, and the shortfall must be compensated for by the excitation element, resulting in a problem that the load on the excitation element is heavy and the device cannot be miniaturized.
この発明は上記のような問題点を解決するためになされ
たものであり、トータルの漏洩磁界を小さく抑えること
により、バイアス磁界のオフセット量を小さく抑え、励
磁素子への負担を小さくすることを目的としている。This invention was made to solve the above-mentioned problems, and aims to reduce the amount of offset of the bias magnetic field and reduce the burden on the excitation element by suppressing the total leakage magnetic field. It is said that
［課題を解決するための手段］
この発明に係わる光磁気記録再生消去装置は、集光レン
ズアクチュエータ、リニアモータ、及びディスクモータ
を構成する各磁気回路からの各漏洩磁界の、記録面に垂
直な成分のうち、２つの成分の和が他の１つの成分と逆
極性となるようにしたものである。[Means for Solving the Problems] A magneto-optical recording/reproducing/erasing device according to the present invention suppresses each leakage magnetic field perpendicular to the recording surface from each magnetic circuit constituting a condensing lens actuator, a linear motor, and a disk motor. Among the components, the sum of two components has a polarity opposite to that of the other component.
［作用］
この発明におけるトータルの漏洩磁界は極めて小さくな
り、バイアス磁界のオフセット量が小さく抑えられ、励
磁素子の負担が軽減される。[Operation] In the present invention, the total leakage magnetic field becomes extremely small, the amount of offset of the bias magnetic field is suppressed to a small value, and the burden on the excitation element is reduced.
［実施例］
以下、この発明の一実施例による光磁気記録再生消去装
置を図について説明する。[Embodiment] Hereinafter, a magneto-optical recording/reproducing/erasing device according to an embodiment of the present invention will be described with reference to the drawings.
第１図（ａ）（１１）は、各々この発明の一実施例によ
る光磁気記録再生消去装置における動作を説明する説明
図であり、集光レンズアクチュエータ漏洩磁界の向きに
対して、リニアモータ漏洩磁界の向きとディスククラン
プ漏洩磁界の向きを逆向きとなるように各永久磁石の極
性を決定し、トータルの漏洩磁界を最小としたものであ
る。なお、第１図（ａ）は記録時を示し、第１図（ｂ）
は消去時を示す。FIGS. 1(a) and (11) are explanatory diagrams for explaining the operation of a magneto-optical recording/reproducing/erasing device according to an embodiment of the present invention. The polarity of each permanent magnet is determined so that the direction of the magnetic field and the direction of the disk clamp leakage magnetic field are opposite to each other, thereby minimizing the total leakage magnetic field. Note that FIG. 1(a) shows the time of recording, and FIG. 1(b)
indicates the time of erasure.
図において、（１）は光ディスク、（４）は婁光レンズ
、（６）は励磁素子、（１２ａＸＩ２ｂ） （総称する
ときは（１２））はバイアス磁界、（１３）は集光レン
ズアクチュエータ漏洩磁界、（１４）はりニアモータ漏
洩磁界、（１５）はディスククランプ漏洩磁界、（１６
）はトータルの漏洩磁界、（１７ａ） （１７ｂ）は記
録面（１ａ）に実際に印加される磁界である。集光レン
ズアクチュエータ漏洩磁界（１３）の向きと、リニアモ
ータ漏洩磁界（１４）、及びディスククランプ漏洩磁界
（１５）の向きとが逆向きであると、重ね合わせの原理
から、お互いに相殺されるため、トータルの漏洩磁界（
１６）は小さく抑えられる。これにより、バイアス磁界
（１２）のオフセラ）ｆｌが小さくなり、記録時、消去
時何れの場合にも、励磁素子に大きな負担を欠けること
なく、記録、及び消去に必要な磁界を記録面に印加する
ことができる。In the figure, (1) is an optical disk, (4) is a light lens, (6) is an excitation element, (12aXI2b) ((12) when referred to collectively) is a bias magnetic field, and (13) is a condensing lens actuator leakage magnetic field. , (14) beam near motor leakage magnetic field, (15) disk clamp leakage magnetic field, (16
) is the total leakage magnetic field, and (17a) and (17b) are the magnetic fields actually applied to the recording surface (1a). If the direction of the condensing lens actuator leakage magnetic field (13) is opposite to the directions of the linear motor leakage magnetic field (14) and the disk clamp leakage magnetic field (15), they cancel each other out due to the principle of superposition. Therefore, the total leakage magnetic field (
16) can be kept small. As a result, the bias magnetic field (12) offset fl becomes small, and the magnetic field necessary for recording and erasing can be applied to the recording surface without placing a large burden on the excitation element during both recording and erasing. can do.
なお、バイアス磁界の向き、漏洩磁界の向きは、上記実
施例の場合にこだわらず、集光レンズアクチュエータ漏
洩磁界、リニアモータ漏洩磁界、及びディスククランプ
漏洩磁界のうち、２つの漏洩磁界の和が他の１つの漏洩
磁界と逆極性となるようにしてもよい。Note that the direction of the bias magnetic field and the direction of the leakage magnetic field are not limited to those in the above embodiment, and the sum of two leakage magnetic fields among the condenser lens actuator leakage magnetic field, linear motor leakage magnetic field, and disk clamp leakage magnetic field is the other. The polarity may be opposite to that of one of the leakage magnetic fields.
さらに、ディスクモータの、ディスククランプ以外の他
の部分や、プランジャ一部の磁気回路等からの漏洩磁界
が問題となる場合は、これらの磁気回路からの漏洩磁界
も加えたトータルの漏洩磁界が最小となるように、各磁
気回路に組み込まれている永久磁石等の極性の絹合せを
決めればよい。Furthermore, if the leakage magnetic field from other parts of the disk motor other than the disk clamp or the magnetic circuit of a part of the plunger becomes a problem, the total leakage magnetic field including the leakage magnetic field from these magnetic circuits should be minimized. It is only necessary to determine the polarity combination of the permanent magnets etc. incorporated in each magnetic circuit so that
［発明の効果］
以上のように、この発明によれば集光レンズアクチュエ
ータ、リニアモータ、及びディスクモータを構成する各
磁気回路からの各漏洩磁界の、記録面に垂直な成分のう
ち、２つの成分の和が他の１つの成分と逆極性となるよ
うにしたので、光デイスク記録面における漏洩磁界の大
きさが小さく抑えられ、これにより、励磁素子への負担
が軽減され、しいては装置の小型化が図れるという効果
がある。[Effects of the Invention] As described above, according to the present invention, two of the components perpendicular to the recording surface of each leakage magnetic field from each magnetic circuit constituting the condenser lens actuator, linear motor, and disk motor are Since the sum of the components has a polarity opposite to that of one other component, the magnitude of the leakage magnetic field on the optical disk recording surface is suppressed to a small level, which reduces the load on the excitation element, which in turn reduces the This has the effect of making it more compact.
第１図（ａＸｂ）は、各々この発明の一実施例による光
磁気記録再生消去装置における動作を説明する説明図、
第２図及び第３図は各々従来の光磁気記録再生消去装置
の一般的な構成を示す斜視図及び断面構成図、並びに第
４図（ａ）（ｈ）は、各々従来の光磁気記録再生消去装
置における動作を説明する説明図である。
図において、（１）は光ディスク、（１ａ）は記録面、
（２）はディスクモータ、（３）は光ヘッド、（４）は
集光レンズ、（５）は集光レンズアクチュエータ、（６
）は励磁素子、（９）はりニアモータコイル、（１０）
はりニアモータ磁気回路、（１２ａ）（１２ｈ）はバイ
アス磁界、（１３）は集光レンズアクチュエータ漏洩磁
界、（１４）はりニアモータ漏洩磁界、（１５）はディ
スククランプ漏洩磁界である。
なお、図中、同一符号は同一または相当部分を示す。FIG. 1 (aXb) is an explanatory diagram illustrating the operation of a magneto-optical recording/reproducing/erasing device according to an embodiment of the present invention;
FIGS. 2 and 3 are a perspective view and a cross-sectional configuration diagram showing the general configuration of a conventional magneto-optical recording/reproducing device, respectively, and FIGS. FIG. 3 is an explanatory diagram illustrating the operation of the erasing device. In the figure, (1) is an optical disk, (1a) is a recording surface,
(2) is a disk motor, (3) is an optical head, (4) is a condensing lens, (5) is a condensing lens actuator, (6)
) is the excitation element, (9) the beam near motor coil, (10)
In the beam near motor magnetic circuit, (12a) and (12h) are bias magnetic fields, (13) is a condensing lens actuator leakage magnetic field, (14) is a beam near motor leakage magnetic field, and (15) is a disk clamp leakage magnetic field. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
スクに対し光ビームを用いて情報の記録、再生及び消去
を行なう光ヘッド、この光ヘッド内に構成され、上記光
ビームの集光を行なう集光レンズを駆動する集光レンズ
アクチュエータ、情報の記録及び消去時に、上記光ディ
スクの記録面に対し、記録面に垂直な方向のバイアス磁
界を印加する励磁素子、並びに上記光ヘッドを上記光デ
ィスクの半径方向に移動させるリニアモータを備えるも
のにおいて、上記集光レンズアクチュエータ、上記リニ
アモータ、及び上記ディスクモータを構成する各磁気回
路からの各漏洩磁界の、上記記録面に垂直な成分のうち
、２つの成分の和が他の１つの成分と逆極性となるよう
にしたことを特徴とする光磁気記録再生消去装置。A disk motor that rotates the optical disk; an optical head that uses a light beam to record, reproduce, and erase information on the optical disk; and a condensing lens that is configured within the optical head and that focuses the light beam. an excitation element that applies a bias magnetic field in a direction perpendicular to the recording surface of the optical disk during recording and erasing of information, and a linear actuator that moves the optical head in the radial direction of the optical disk. In the device equipped with a motor, the sum of two components perpendicular to the recording surface of each leakage magnetic field from each magnetic circuit constituting the condensing lens actuator, the linear motor, and the disk motor is 1. A magneto-optical recording/reproducing/erasing device characterized in that the polarity is opposite to that of one of the components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63141037A JP2576594B2 (en) | 1988-06-07 | 1988-06-07 | Magneto-optical recording / reproduction / erasing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63141037A JP2576594B2 (en) | 1988-06-07 | 1988-06-07 | Magneto-optical recording / reproduction / erasing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01307943A true JPH01307943A (en) | 1989-12-12 |
| JP2576594B2 JP2576594B2 (en) | 1997-01-29 |
Family
ID=15282765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63141037A Expired - Fee Related JP2576594B2 (en) | 1988-06-07 | 1988-06-07 | Magneto-optical recording / reproduction / erasing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2576594B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH064930U (en) * | 1992-06-26 | 1994-01-21 | アルプス電気株式会社 | Head unit for magneto-optical disk |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63214903A (en) * | 1987-03-03 | 1988-09-07 | Olympus Optical Co Ltd | Magnetic circuit for magneto-optical recording and reproducing device |
-
1988
- 1988-06-07 JP JP63141037A patent/JP2576594B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63214903A (en) * | 1987-03-03 | 1988-09-07 | Olympus Optical Co Ltd | Magnetic circuit for magneto-optical recording and reproducing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH064930U (en) * | 1992-06-26 | 1994-01-21 | アルプス電気株式会社 | Head unit for magneto-optical disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2576594B2 (en) | 1997-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4868802A (en) | Magnetooptic recording and erasing head which performs biasing, tracking and focusing | |
| JPH01307943A (en) | Magneto-optical recording/reproducing and erasing device | |
| JPH0232692B2 (en) | ||
| JP2004110971A (en) | Objective lens driving device, optical pickup device, and optical disk device | |
| JPS6332755A (en) | Magneto-optical head | |
| JPH05334749A (en) | Magneto-optical recording / reproducing device | |
| JPH0253201A (en) | Bias magnetic field impressing device | |
| JP3378624B2 (en) | Disk cartridge | |
| JP3500495B2 (en) | Objective lens drive | |
| JPS59231743A (en) | Objective lens drive device | |
| JP2635045B2 (en) | Magneto-optical disk device | |
| JP3351472B2 (en) | Magneto-optical disk recording / reproducing device | |
| JPS58171731A (en) | Disc reproducing device | |
| JPH10208264A (en) | Optical pickup device | |
| JPH06251386A (en) | Magneto-optical disk device, magneto-optical head thereof, and rotating recording medium | |
| JPH03212825A (en) | Focusing and tracking servo actuator | |
| JPH0935294A (en) | Two-axis actuator | |
| JPH10172158A (en) | Objective lens drive | |
| JPH05189825A (en) | Lens actuator and magneto-optical disk apparatus with it | |
| JPS60202551A (en) | Optical head for optical information recording and playback | |
| JPH01204232A (en) | Lens actuator | |
| JPH0362330A (en) | Focusing and tracking servo actuator | |
| JPH0395743A (en) | Magneto-optical recording device | |
| JPH01137445A (en) | Magneto-optical disk device | |
| JPH0676324A (en) | Magnetooptical disk device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |