JPH0413773Y2 - - Google Patents
Info
- Publication number
- JPH0413773Y2 JPH0413773Y2 JP1985177702U JP17770285U JPH0413773Y2 JP H0413773 Y2 JPH0413773 Y2 JP H0413773Y2 JP 1985177702 U JP1985177702 U JP 1985177702U JP 17770285 U JP17770285 U JP 17770285U JP H0413773 Y2 JPH0413773 Y2 JP H0413773Y2
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic pole
- magnetic
- optical head
- recording
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 22
- 230000004907 flux Effects 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000005284 excitation Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Magnetic Heads (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案は光学的に情報を記録再生する光磁気記
録再生装置に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a magneto-optical recording and reproducing device that optically records and reproduces information.
従来の技術
光磁気記録媒体と情報交換を行なう光磁気記録
再生装置は従来より各種の方式が提案されてお
り、特に記録及び消去に必要な補助磁界の発生装
置に関して、特開昭59−119507号に示されてお
り、例えば第３図及び第４図に示すような構造で
ある。１は記録媒体、２は光学ヘツドである。光
学ヘツド２は送り装置（図示せず）によつて第３
図の矢印Ａの方向にアクセスされ、さらに対物レ
ンズ３によつてレーザー光８が記録媒体１の表面
に合焦される様に対物レンズ３の位置を制御する
焦点合わせ機構（図示せず）を有する。この光学
ヘツド２で記録媒体１の表面を矢印Ａの方向に走
査しつつ情報の記録再生をおこなう。４は記録媒
体１の表面に垂直磁界を印加するための磁気回路
である。磁気回路４は記録媒体を挾んで光学ヘツ
ド２と対向する位置に配置され、光学ヘツド２の
アクセス方向に沿つて、光学ヘツド２の走査領域
をカバーするだけの長さをもつた棒状の磁極５
と、この磁極５に巻回された励磁コイル６、及び
磁極５を取り囲むようにした継鉄７とから構成さ
れている。Prior Art Various types of magneto-optical recording and reproducing devices that exchange information with magneto-optical recording media have been proposed in the past, and in particular, a device for generating an auxiliary magnetic field necessary for recording and erasing is disclosed in Japanese Patent Application Laid-open No. 119507/1983. For example, the structure is shown in FIGS. 3 and 4. 1 is a recording medium, and 2 is an optical head. The optical head 2 is moved to the third position by a feeding device (not shown).
A focusing mechanism (not shown) is accessed in the direction of arrow A in the figure and controls the position of the objective lens 3 so that the laser beam 8 is focused by the objective lens 3 on the surface of the recording medium 1. have This optical head 2 scans the surface of the recording medium 1 in the direction of arrow A while recording and reproducing information. 4 is a magnetic circuit for applying a perpendicular magnetic field to the surface of the recording medium 1; The magnetic circuit 4 is disposed at a position facing the optical head 2 with the recording medium in between, and has a rod-shaped magnetic pole 5 having a length sufficient to cover the scanning area of the optical head 2 along the access direction of the optical head 2.
, an excitation coil 6 wound around the magnetic pole 5 , and a yoke 7 surrounding the magnetic pole 5 .
また、磁極５の先端部５ａはくさび状に構成さ
れ、その先端面と継鉄７の媒体対向先端面は同一
平面であり、距離δをもつて記録媒体１に対向さ
れている。 Further, the tip end 5a of the magnetic pole 5 is formed into a wedge shape, and the tip end face and the medium facing end face of the yoke 7 are on the same plane, and are opposed to the recording medium 1 with a distance δ.
上記の構成により、励磁コイル６に通電する
と、第４図に示すφaの様な磁束が流れ記録媒体
１に対して垂直磁界が発生する。この垂直磁界に
よつて情報の記録消去をおこなう。 With the above configuration, when the excitation coil 6 is energized, a magnetic flux like φa shown in FIG. 4 flows and a perpendicular magnetic field is generated with respect to the recording medium 1. Information is recorded and erased by this perpendicular magnetic field.
考案が解決しようとする問題点
しかしながら、従来例の構成による磁気回路に
よると、第４図に示すφbの様な漏れ磁束が大き
くなる。したがつて、レーザー光８の焦点部分で
情報の記録消去に必要な垂直磁界を発生させるた
めには励磁コイルに多大な電流を流す必要があ
り、励磁コイル６の発熱は消費電力等に問題があ
つた。Problems to be Solved by the Invention However, according to the magnetic circuit having the conventional configuration, leakage magnetic flux such as φb shown in FIG. 4 becomes large. Therefore, in order to generate the perpendicular magnetic field necessary for recording and erasing information at the focal point of the laser beam 8, it is necessary to flow a large amount of current through the excitation coil, and the heat generated by the excitation coil 6 causes problems such as power consumption. It was hot.
問題点を解決するための手段
本考案は上記の問題点を解決するため、記録媒
体を所定の位置に装着する装着手段と、記録媒体
面を走査しながら前記記録媒体面にレーザー光を
照射し情報の記録再生を行なう光学ヘツドと、前
記記録媒体面に垂直磁界を印加する磁気回路とを
有し、前記磁気回路は、磁束発生手段と、前記記
録媒体を挾んで前記光学ヘツドと対向し前記光学
ヘツドの走査領域に垂直磁界を印加し得る長さを
有する第１の磁極と、前記記録媒体を挾んで前記
第１の磁極と対向する位置に第２の磁極を有し、
前記第２の磁極には記録媒体上に照射される光ス
ポツトの直径よりもやや広い幅でかつ走査領域を
カバーする長さを有した開口部が設けられ、前記
第１の磁極を記録媒体の記録面に対して垂直な軸
を中心として回動可能としたものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a mounting means for mounting a recording medium in a predetermined position, and a method for irradiating a laser beam onto the surface of the recording medium while scanning the surface of the recording medium. The optical head has an optical head for recording and reproducing information, and a magnetic circuit for applying a perpendicular magnetic field to the surface of the recording medium, and the magnetic circuit includes a magnetic flux generating means, and a magnetic circuit that faces the optical head with the recording medium in between. a first magnetic pole having a length capable of applying a perpendicular magnetic field to a scanning area of an optical head; and a second magnetic pole located at a position opposite to the first magnetic pole with the recording medium sandwiched therebetween;
The second magnetic pole is provided with an opening having a width slightly wider than the diameter of the light spot irradiated onto the recording medium and a length that covers the scanning area, and the opening has a length that covers the scanning area. It is rotatable around an axis perpendicular to the recording surface.
作 用
本発明は上記の構成により、第１の磁極から第
２の磁極に、記録媒体に対して垂直に磁束を印加
することができ、さらに、漏れ磁束の小さな磁気
回路を実現することができる。Effects With the above configuration, the present invention can apply magnetic flux perpendicularly to the recording medium from the first magnetic pole to the second magnetic pole, and furthermore, can realize a magnetic circuit with small leakage magnetic flux. .
実施例
第１図は本考案の光磁気記録再生装置の１実施
例を示す斜視図であり第２図は磁気回路の詳細を
示す断面図である。１は記録媒体で、スピンドル
モーター１０によつて回転駆動される。２は光学
ヘツドで、光学ヘツド駆動装置１２によつて記録
媒体１の半径方向に駆動される。３は対物レンズ
でレーザー光８の焦点が記録媒体１上に結ばれる
様な位置に制御されている。１８は第１の磁極
で、対物レンズ３の駆動される方向に沿つて、対
物レンズ３の駆動される領域をカバーする長さを
有している。第１の磁極１８は、記録媒体１に対
して垂直な方向に、先端部がくさび状の第１の磁
極歯２０を有し、さらに、記録媒体１とほぼ平行
な方向にアーム部１４を有している。６は励磁コ
イルでアーム部１４の回りに巻回されている。２
２は回動軸で、磁気回路本体１６に固定されてお
り、第１の磁極はこの回動軸２２を中心として回
動する。磁気回路本体１６は、記録媒体１を挟ん
で光学ヘツド２に接触しない様に、対物レンズ３
の駆動される方向に、対物レンズ３の駆動される
領域をカバーする長さを持つた第２の磁極２４を
有している。第２の磁極２４には対物レンズ３の
直径よりもやや広い幅を持つた開口部２６が設け
られており、開口部２６は対物レンズ３が記録媒
体１の記録領域の最内周から最外周までを移動し
た場合でも第２の磁極に接触しない様な長さを有
している。さらに、開口部２６には、開口部２６
の内周にそつて記録媒体１に接触しない様に付き
出し部２８が設けられている。Embodiment FIG. 1 is a perspective view showing an embodiment of the magneto-optical recording and reproducing apparatus of the present invention, and FIG. 2 is a sectional view showing details of the magnetic circuit. Reference numeral 1 denotes a recording medium, which is rotationally driven by a spindle motor 10 . Reference numeral 2 denotes an optical head, which is driven in the radial direction of the recording medium 1 by an optical head drive device 12. Reference numeral 3 denotes an objective lens which is controlled to a position such that the laser beam 8 is focused on the recording medium 1. Reference numeral 18 denotes a first magnetic pole, which has a length that covers the area in which the objective lens 3 is driven along the direction in which the objective lens 3 is driven. The first magnetic pole 18 has a first magnetic pole tooth 20 with a wedge-shaped tip in a direction perpendicular to the recording medium 1, and further has an arm portion 14 in a direction substantially parallel to the recording medium 1. are doing. An excitation coil 6 is wound around the arm portion 14. 2
Reference numeral 2 denotes a rotation shaft, which is fixed to the magnetic circuit main body 16, and the first magnetic pole rotates around this rotation shaft 22. The magnetic circuit body 16 is placed between the objective lens 3 and the optical head 2 with the recording medium 1 in between.
It has a second magnetic pole 24 having a length that covers the driven region of the objective lens 3 in the direction in which the objective lens 3 is driven. The second magnetic pole 24 is provided with an opening 26 having a width slightly wider than the diameter of the objective lens 3 . It has such a length that it does not come into contact with the second magnetic pole even if it moves up to the point. Further, the opening 26 has an opening 26
A projecting portion 28 is provided along the inner circumference of the recording medium 1 so as not to contact the recording medium 1.
上記の構成によつて、記録媒体１をスピンドル
モーター１０に装着する場合には、第１の磁極１
８を磁極移動装置３２によつて矢印Ｂの方向に回
動させる。記録媒体１を装着した後に第１の磁極
１８は第２の磁極２４と対向する位置にもどり、
記録媒体１との情報のやりとりが可能になる。磁
極移動装置３２は例えば、電極ソレノイドの様な
ものであつても良い。 With the above configuration, when the recording medium 1 is mounted on the spindle motor 10, the first magnetic pole 1
8 is rotated in the direction of arrow B by the magnetic pole moving device 32. After loading the recording medium 1, the first magnetic pole 18 returns to the position facing the second magnetic pole 24,
Information can be exchanged with the recording medium 1. The magnetic pole moving device 32 may be, for example, an electrode solenoid.
励磁コイル６に通電すると第１の磁極１８から
第２の磁極２４に向かつてφc及びφdの様な磁束
が発生する。このφc及びφdなる磁束は第１の磁
極歯２０から付き出し部２８を通り、磁気回路３
０のなかを流れている。また、励磁コイル６はア
ーム部１４に巻かれているため漏れ磁束も少なく
なる。従つて、従来例の様に多大な電流を流すこ
となくレーザー光８の焦点位置で必要な起磁力を
得ることができる。 When the excitation coil 6 is energized, magnetic fluxes such as φc and φd are generated from the first magnetic pole 18 toward the second magnetic pole 24. These magnetic fluxes φc and φd pass through the protruding portion 28 from the first magnetic pole tooth 20 and pass through the magnetic circuit 3.
Flowing through 0. Furthermore, since the excitation coil 6 is wound around the arm portion 14, leakage magnetic flux is also reduced. Therefore, the necessary magnetomotive force can be obtained at the focal position of the laser beam 8 without flowing a large amount of current as in the conventional example.
考案の効果
本考案は、磁気回路を、記録媒体を挟んで光学
ヘツドと対向し光学ヘツド２の走査領域に垂直磁
界を印加し得る長さを有する第１の磁極と、記録
媒体を挟んで第１の磁極と対向する位置に第２の
磁極を有し、前記第２の磁極には記録媒体上に照
射される光スポツトの直径よりもやや広い幅でか
つ走査領域をカバーする長さを有した開口部が設
けられているので、磁束の流れが開口部中心線に
対してほぼ対称になり、記録媒体に対して垂直磁
界が効率良く印加できる。従つて、多大な電流を
流すことなく必要な起磁力が得られるため、励磁
コイルの発熱等の問題も解消することができる。
さらに、第１の磁極と第２の磁極とを係合してい
る軸を中心として、第１の磁極を記録媒体の記録
面と平行な方向に回動可能に構成しているので、
記録媒体の着脱を容易に行え、かつ薄型化を実現
する光磁気記録再生装置を提供することができ
る。Effects of the Invention The present invention comprises a magnetic circuit including a first magnetic pole that faces the optical head with the recording medium in between and has a length capable of applying a perpendicular magnetic field to the scanning area of the optical head 2, and a second magnetic pole that faces the optical head with the recording medium in between. A second magnetic pole is provided at a position facing the first magnetic pole, and the second magnetic pole has a width slightly wider than a diameter of a light spot irradiated onto a recording medium and a length that covers a scanning area. Since such an opening is provided, the flow of magnetic flux becomes approximately symmetrical with respect to the center line of the opening, and a perpendicular magnetic field can be efficiently applied to the recording medium. Therefore, since the necessary magnetomotive force can be obtained without passing a large amount of current, problems such as heat generation in the excitation coil can be solved.
Furthermore, since the first magnetic pole is configured to be rotatable in a direction parallel to the recording surface of the recording medium about the axis that engages the first magnetic pole and the second magnetic pole,
It is possible to provide a magneto-optical recording and reproducing device that allows the recording medium to be easily attached and detached and that can be made thinner.
第１図は本考案の光磁気記録再生装置の斜視
図、第２図は磁気回路の断面図、第３図は従来例
の磁気回路の斜視図、第４図は従来例の磁気回路
の断面図である。
１……記録媒体、２……光学ヘツド、３……対
物レンズ、４……磁界印加用磁気回路、５……磁
極、６……励磁コイル、７……継鉄、８……レー
ザー光、１０……スピンドルモーター、１２……
光学ヘツド駆動装置、１４……アーム部、１６…
…励磁コイル、１８……第１の磁極、２０……第
１の磁極歯、２２……回動軸、２４……第２の磁
極、２６……開口部、２８……付き出し部、３０
……磁気回路、３２……磁極移動装置。
Fig. 1 is a perspective view of the magneto-optical recording/reproducing device of the present invention, Fig. 2 is a sectional view of a magnetic circuit, Fig. 3 is a perspective view of a conventional magnetic circuit, and Fig. 4 is a sectional view of a conventional magnetic circuit. It is a diagram. DESCRIPTION OF SYMBOLS 1... Recording medium, 2... Optical head, 3... Objective lens, 4... Magnetic circuit for applying a magnetic field, 5... Magnetic pole, 6... Excitation coil, 7... Yoke, 8... Laser light, 10... spindle motor, 12...
Optical head drive device, 14... Arm portion, 16...
... Excitation coil, 18 ... First magnetic pole, 20 ... First magnetic pole tooth, 22 ... Rotation shaft, 24 ... Second magnetic pole, 26 ... Opening, 28 ... Projection, 30
...Magnetic circuit, 32...Magnetic pole moving device.
Claims (1)
記録媒体面を走査しながら前記記録媒体面にレー
ザー光を照射し情報の記録再生を行なう光学ヘツ
ドと、前記記録媒体面に垂直磁界を印加する磁気
回路とを有し、前記磁気回路は、磁束発生手段
と、前記記録媒体を挾んで前記光学ヘツドと対向
し前記光学ヘツドの走査領域に垂直磁界を印加し
得る長さを有する第１の磁極と、前記記録媒体を
挾んで前記第１の磁極と対向する位置に第２の磁
極を有し、前記第２の磁極には記録媒体上に照射
される光スポツトの直径よりもやや広い幅でかつ
走査領域をカバーする長さを持つた開口部が設け
られ、前記第１の磁極を記録媒体の記録面に対し
て垂直な軸を中心として回動可能とした光磁気記
録再生装置。 a mounting means for mounting the recording medium in a predetermined position;
The optical head includes an optical head that performs recording and reproduction of information by irradiating a laser beam onto the recording medium surface while scanning the recording medium surface, and a magnetic circuit that applies a perpendicular magnetic field to the recording medium surface, and the magnetic circuit has a magnetic flux a first magnetic pole facing the optical head with the recording medium in between and having a length capable of applying a perpendicular magnetic field to a scanning area of the optical head; and a first magnetic pole with the recording medium in between. The second magnetic pole has an opening having a width slightly wider than the diameter of the light spot irradiated onto the recording medium and a length that covers the scanning area. A magneto-optical recording/reproducing device, wherein the first magnetic pole is rotatable about an axis perpendicular to the recording surface of the recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985177702U JPH0413773Y2 (en) | 1985-11-19 | 1985-11-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985177702U JPH0413773Y2 (en) | 1985-11-19 | 1985-11-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6285930U JPS6285930U (en) | 1987-06-01 |
| JPH0413773Y2 true JPH0413773Y2 (en) | 1992-03-30 |
Family
ID=31119151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985177702U Expired JPH0413773Y2 (en) | 1985-11-19 | 1985-11-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0413773Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119507A (en) * | 1982-12-27 | 1984-07-10 | Fujitsu Ltd | Photo-magnetic recorder |
| JPS6050702A (en) * | 1983-08-31 | 1985-03-20 | Fujitsu Ltd | Impressing device of bias magnetic field for photomagnetic disk |
| JPS60147949A (en) * | 1984-01-12 | 1985-08-05 | Canon Inc | Photo-electro-magnetic disc device with auxiliary magnetic pole |
-
1985
- 1985-11-19 JP JP1985177702U patent/JPH0413773Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119507A (en) * | 1982-12-27 | 1984-07-10 | Fujitsu Ltd | Photo-magnetic recorder |
| JPS6050702A (en) * | 1983-08-31 | 1985-03-20 | Fujitsu Ltd | Impressing device of bias magnetic field for photomagnetic disk |
| JPS60147949A (en) * | 1984-01-12 | 1985-08-05 | Canon Inc | Photo-electro-magnetic disc device with auxiliary magnetic pole |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6285930U (en) | 1987-06-01 |
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