JPH0253201A - Bias magnetic field impressing device - Google Patents
Bias magnetic field impressing deviceInfo
- Publication number
- JPH0253201A JPH0253201A JP20440288A JP20440288A JPH0253201A JP H0253201 A JPH0253201 A JP H0253201A JP 20440288 A JP20440288 A JP 20440288A JP 20440288 A JP20440288 A JP 20440288A JP H0253201 A JPH0253201 A JP H0253201A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnets
- actuators
- lens
- bias magnetic
- 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
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 claims 1
- 230000020169 heat generation Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 241000277269 Oncorhynchus masou Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は光磁気ディスクにバイアス磁界を印加するバ
イアス磁界印加装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bias magnetic field applying device that applies a bias magnetic field to a magneto-optical disk.
光磁気ディスクは書換え可能な大容量記憶媒体として開
発されたものであり、−面にレーザ光が対物レンズによ
り１〜２ミクロン径に集束させ照射されると共に、他面
にデータの記憶及び消去に応じて極性の異なるバイアス
磁界が印加されるものである。Magneto-optical disks were developed as rewritable large-capacity storage media, and one side is irradiated with a laser beam that is focused to a diameter of 1 to 2 microns using an objective lens, while the other side is used for storing and erasing data. Bias magnetic fields with different polarities are applied accordingly.
第２図は従来のバイアス磁界印加装置の構成を示す模式
的断面図である。図において４は円板状のディスク媒体
であり、該ディスク媒体４は磁性層４ａと基板４ｂとか
らなり、その下面側には半導体レーザ、光検知器及び光
学系からなるレーザａ６及び該レーザ源６から照射され
たレーザ光を磁性層４ａで１〜２ミクロン径に集束する
レンズ５がディスク媒体４の径方向に移動自在となし設
けられている。レンズ５の周囲にはレンズ５を前記径方
向及び上下方向に移動させる駆動手段たるアクチュエー
タ７．７が設けられている。アクチュエータ７．７はア
クセス用コイル７ａ、７ａとアクチュエータ用磁石１ｂ
、１ｂとを備え、それらの相互作用によりレンズ５を上
下及び径方向に駆動している。FIG. 2 is a schematic cross-sectional view showing the configuration of a conventional bias magnetic field applying device. In the figure, 4 is a disk-shaped disk medium, and the disk medium 4 is made up of a magnetic layer 4a and a substrate 4b, and a laser a6 consisting of a semiconductor laser, a photodetector, and an optical system, and the laser source are provided on the lower surface side of the disk medium 4. A lens 5 is provided so as to be movable in the radial direction of the disk medium 4 so that the laser beam irradiated from the disk medium 4 is focused by a magnetic layer 4a to a diameter of 1 to 2 microns. An actuator 7.7 serving as a driving means for moving the lens 5 in the radial direction and in the vertical direction is provided around the lens 5. The actuator 7.7 includes access coils 7a, 7a and actuator magnet 1b.
, 1b, and their interaction drives the lens 5 in the vertical and radial directions.
またディスク媒体４の上面側にはＥ字を９０″時計回り
に回転させた如きの断面形状をなし、その長手方向をデ
ィスク媒体４の径方向となしたコア２が、その幅方向の
中心部を前記レンズ５に対向する位置となすように設け
られている。コア２の中心部にはコイル１が巻回され、
コイル１に通流する電流の方向を、ディスク媒体４への
記録及び消去に応じて切換え、相反する極性の磁界を磁
性層４ａに印加している。Further, on the upper surface side of the disk medium 4, a core 2, which has a cross-sectional shape similar to that of an E letter rotated 90'' clockwise, and whose longitudinal direction is the radial direction of the disk medium 4, is located at the center in the width direction. is provided so as to face the lens 5.A coil 1 is wound around the center of the core 2.
The direction of the current flowing through the coil 1 is switched according to recording and erasing on the disk medium 4, and magnetic fields of opposite polarities are applied to the magnetic layer 4a.
このように構成された従来のバイアス磁界印加装置にあ
っては、アクチュエータ用磁石からの一方向の極性を有
する磁界が数＋Ｏｅあり、これと逆方向の極性のバイア
ス磁界を印加するときにそれのオフセットとして作用す
る。従ってこれを打ち消すために、余分なバイアス磁界
を印加する必要があり、従来の装置にあってはコイル電
流を増加することでこれに対処していたが、この場合コ
イル抵抗弁だけ消費電力が増加するという問題があった
。In the conventional bias magnetic field applying device configured as described above, there are several Oe of magnetic field having one direction polarity from the actuator magnet, and when applying a bias magnetic field with polarity in the opposite direction, Acts as an offset. Therefore, in order to cancel this, it is necessary to apply an extra bias magnetic field, and in conventional devices, this was dealt with by increasing the coil current, but in this case, the power consumption only increases by the coil resistance valve. There was a problem.
この発明は上記の事情によりなされたものであり、アク
チュエータ用磁石からの磁界を打ち消す方向の磁界を発
生させる永久磁石を備えることにより、発熱及び消費電
流を低減させたバイアス磁界印加装置を提供することを
目的とする。The present invention has been made in view of the above circumstances, and provides a bias magnetic field applying device that reduces heat generation and current consumption by including a permanent magnet that generates a magnetic field in a direction that cancels the magnetic field from the actuator magnet. With the goal.
この発明に係るバイアス磁界印加装置は、レンズの駆動
手段から漏洩する磁界を打ち消す方向及び磁界強度を有
する永久磁石を設けたものである。A bias magnetic field applying device according to the present invention is provided with a permanent magnet having a direction and magnetic field strength that cancels out a magnetic field leaking from a lens driving means.
この発明においては、永久磁石から発生する磁界により
、レンズの駆動手段から漏洩する磁界を″打ち消し、コ
イルの消費電流を低減させる。In this invention, the magnetic field generated by the permanent magnet cancels out the magnetic field leaking from the lens driving means, thereby reducing the current consumption of the coil.
以下この発明をその一実施例を示す図面に基づき説明す
る。第１図はこの発明に係るバイアス磁界印加装置の構
造を示す模式的断面図である。図において４は円板状の
ディスク媒体であり、該ディスク媒体４は磁性層４ａと
基板４ｂとからなり、その下面側には、半導体レーザ、
光検知器及び光学系からなるレーザ源６及び該レーザ源
６から照射されたレーザ光を磁性層４ａで１〜２ミクロ
ン径に集束するレンズ５がディスク媒体４の径方向に移
動自在となし設けられている。レンズ５の周囲にはレン
ズ５を前記径方向及び上下方向に移動させる駆動手段た
るアクチュエータ７．７が設けられている。アクチュエ
ータ７．７はアクチュエータ用コイル７ａ、７ａとアク
チュエータ用磁石７ｂ、 ７ｂとを備え、それらの相互
作用によりレンズ５を上下及び径方向に駆動している。The present invention will be explained below based on the drawings showing one embodiment thereof. FIG. 1 is a schematic cross-sectional view showing the structure of a bias magnetic field applying device according to the present invention. In the figure, 4 is a disk-shaped disk medium, and the disk medium 4 consists of a magnetic layer 4a and a substrate 4b, and a semiconductor laser, a
A laser source 6 consisting of a photodetector and an optical system, and a lens 5 that focuses the laser beam irradiated from the laser source 6 to a diameter of 1 to 2 microns on a magnetic layer 4a are provided so as to be movable in the radial direction of the disk medium 4. It is being An actuator 7.7 serving as a driving means for moving the lens 5 in the radial direction and in the vertical direction is provided around the lens 5. The actuator 7.7 includes actuator coils 7a, 7a and actuator magnets 7b, 7b, and their interaction drives the lens 5 in the vertical and radial directions.
またディスク媒体４の上面側にはＥ字を９０°時計回り
に回転させた如き断面形状をなし、その長平方向をディ
スク媒体４の径方向となしたコア２が、その幅方向の中
心部を前記レンズ５に対向する位置となすように設けら
れている。コア２の中心部にはコイル１が巻回されてい
る。またコイル１の下側には棒状永久磁石３，３が設け
られている。この永久磁石３．３の磁界強さ及び方向は
前記アクチュエータ用磁石７ｂ、７ｂの磁界を打ち消す
ように定められている。Further, on the upper surface side of the disk medium 4, a core 2 has a cross-sectional shape similar to that of an E letter rotated 90 degrees clockwise, and the core 2 whose elongate direction is the radial direction of the disk medium 4, has a center portion in the width direction. It is provided at a position facing the lens 5. A coil 1 is wound around the center of the core 2. Further, bar-shaped permanent magnets 3, 3 are provided below the coil 1. The magnetic field strength and direction of this permanent magnet 3.3 are determined so as to cancel the magnetic field of the actuator magnets 7b, 7b.
アクチュエータ用磁石７ｂ、７ｂからは数＋Ｏｅの磁界
が発生しており、永久磁石３はその磁界を打ち消す方向
に磁極を設けている。即ちこの実施例ではＮｉを下向き
としている。A magnetic field of several + Oe is generated from the actuator magnets 7b, 7b, and the permanent magnet 3 is provided with magnetic poles in a direction that cancels out the magnetic field. That is, in this embodiment, Ni is directed downward.
このように構成されたこの発明装置にあっては、対物レ
ンズを駆動するアクチュエータを構成するアクチュエー
タ用磁石からの磁界が、それと逆方向の極性を有する永
久磁石により打ち消されるので、アクチュエータ用磁石
の影響が排除できる。In the device of the invention configured in this manner, the magnetic field from the actuator magnet that constitutes the actuator that drives the objective lens is canceled by the permanent magnet having the opposite polarity, so that the influence of the actuator magnet is eliminated. can be eliminated.
なおこの実施例においてはコアを固定式とし、その長手
力向長さをディスク媒体のトランク全体にバイアス磁界
を印加できるような長さとしたが、この発明はこれに限
るものではなく、コアを光学系と共にディスク媒体の径
方向に移動させ、コア長さを短くしてもよい。In this embodiment, the core is of a fixed type, and its length in the longitudinal direction is set to such a length that a bias magnetic field can be applied to the entire trunk of the disk medium, but the present invention is not limited to this. The core length may be shortened by moving the core along with the system in the radial direction of the disk medium.
またこの実施例ではＥ字型のコアに永久磁石を設けた場
合について説明したが、必ずしもコア形状をＥ字型に限
定するものではなく、また永久磁石の形状、着磁方向も
この実施例に限定するものではない。In addition, although this example describes the case where a permanent magnet is provided in an E-shaped core, the core shape is not necessarily limited to the E-shape, and the shape and magnetization direction of the permanent magnet are also the same as in this example. It is not limited.
以上説明したとおり、この発明においては、対物レンズ
のアクチュエータ用磁石から発生する漏れ磁界を打ち消
す永久磁石を設けているので、漏れ磁界を打ち消すため
の余分なバイアス磁界を印加する必要がなく、発熱及び
消費電力を低減させる効果がある。As explained above, in this invention, since a permanent magnet is provided to cancel the leakage magnetic field generated from the actuator magnet of the objective lens, there is no need to apply an extra bias magnetic field to cancel the leakage magnetic field, and heat generation and This has the effect of reducing power consumption.
第１図はこの発明のバイアス磁界印加装置の一実施例の
構成を示す模式的断面図、第２図は従来のバイアス磁界
印加装置の構成を示す模式的断面図である。
１・・・コイル ２・・・コア ３・・・永久磁石４・
・・ディスク媒体 ７・・・アクチュエータ７ｂ・・・
アクチュエータ用磁石
なお、図中、同一符号は同一、又は相当部分を示す。
代理人 大 岩 増 雄
コイル
コア
、にえ磁石
テ゛１又り媒体
第
■FIG. 1 is a schematic cross-sectional view showing the structure of an embodiment of the bias magnetic field applying device of the present invention, and FIG. 2 is a schematic cross-sectional view showing the structure of a conventional bias magnetic field applying device. 1... Coil 2... Core 3... Permanent magnet 4.
...Disk medium 7...Actuator 7b...
Actuator magnet In the figures, the same reference numerals indicate the same or corresponding parts. Agent Masu Oiwa Coil core, secondary magnet medium 1st ■
Claims (1)
るレンズを電磁気的に駆動する駆動手段を有した光ヘッ
ドと対向して配設されたバイアス磁界印加装置において
、 前記駆動手段から漏洩する磁界を打ち消す べく設けられた永久磁石を備えることを特徴とするバイ
アス磁界印加装置。[Claims] 1. In a bias magnetic field applying device disposed opposite to an optical head having a driving means for electromagnetically driving a lens that focuses coherent light irradiated onto a magneto-optical recording medium. . A bias magnetic field applying device comprising a permanent magnet provided to cancel a magnetic field leaking from the driving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20440288A JPH0253201A (en) | 1988-08-17 | 1988-08-17 | Bias magnetic field impressing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20440288A JPH0253201A (en) | 1988-08-17 | 1988-08-17 | Bias magnetic field impressing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0253201A true JPH0253201A (en) | 1990-02-22 |
Family
ID=16489952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20440288A Pending JPH0253201A (en) | 1988-08-17 | 1988-08-17 | Bias magnetic field impressing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0253201A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0447617A2 (en) * | 1990-03-08 | 1991-09-25 | Pioneer Electronic Corporation | Optical magnetic recording and reproducing system |
| JPH04254904A (en) * | 1991-02-06 | 1992-09-10 | Mitsubishi Electric Corp | Magneto-optical recording and reproducing device |
| EP0885554A2 (en) | 1997-06-17 | 1998-12-23 | Masanobu Fukuoka | Paper/seed-unified planting seed unit and preparation process thereof |
| US5970037A (en) * | 1992-06-08 | 1999-10-19 | Asahi Kogaku Kogyo Kabushiki Kaisha | Magneto-optical disk apparatus |
| JP2002025140A (en) * | 2000-07-05 | 2002-01-25 | Olympus Optical Co Ltd | Magneto-optical disk device |
-
1988
- 1988-08-17 JP JP20440288A patent/JPH0253201A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0447617A2 (en) * | 1990-03-08 | 1991-09-25 | Pioneer Electronic Corporation | Optical magnetic recording and reproducing system |
| US5093816A (en) * | 1990-03-08 | 1992-03-03 | Pioneer Electric Corporation | Optical magnetic recording and reproducing system |
| EP0447617A3 (en) * | 1990-03-08 | 1992-08-19 | Pioneer Electronic Corporation | Optical magnetic recording and reproducing system |
| JPH04254904A (en) * | 1991-02-06 | 1992-09-10 | Mitsubishi Electric Corp | Magneto-optical recording and reproducing device |
| US5970037A (en) * | 1992-06-08 | 1999-10-19 | Asahi Kogaku Kogyo Kabushiki Kaisha | Magneto-optical disk apparatus |
| EP0885554A2 (en) | 1997-06-17 | 1998-12-23 | Masanobu Fukuoka | Paper/seed-unified planting seed unit and preparation process thereof |
| JP2002025140A (en) * | 2000-07-05 | 2002-01-25 | Olympus Optical Co Ltd | Magneto-optical disk device |
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