JP2000173123A - Optical head - Google Patents
Optical headInfo
- Publication number
- JP2000173123A JP2000173123A JP10349484A JP34948498A JP2000173123A JP 2000173123 A JP2000173123 A JP 2000173123A JP 10349484 A JP10349484 A JP 10349484A JP 34948498 A JP34948498 A JP 34948498A JP 2000173123 A JP2000173123 A JP 2000173123A
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- Japan
- Prior art keywords
- magnetic field
- objective lens
- optical head
- recording medium
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光磁気ディスク等
の光磁気記録媒体に対して情報を記録及び再生する光磁
気記録再生装置に関し、特に光学ヘッドに関する。The present invention relates to a magneto-optical recording / reproducing apparatus for recording and reproducing information on a magneto-optical recording medium such as a magneto-optical disk, and more particularly to an optical head.
【０００２】[0002]
【従来の技術】近年、高密度記録による大容量化と高速
アクセスが可能であることから光記録再生装置が注目さ
れているが、中でも一旦記録された情報信号を消去し、
新たな情報信号の再記録を可能とする記録媒体を用いた
装置の研究開発が盛んに行われている。2. Description of the Related Art In recent years, optical recording / reproducing apparatuses have attracted attention because of their high capacity and high-speed access by high-density recording.
Research and development of an apparatus using a recording medium that enables re-recording of a new information signal has been actively performed.
【０００３】この記録媒体への情報の記録方法として、
レーザービーム等の光ビームを対物レンズを通して記録
媒体に集束し、記録媒体上の集光点の温度をキュリー点
まで昇温させることにより記録媒体の保磁力を減少さ
せ、この状態で記録媒体の保磁力以上の磁界を外部より
印加して磁化反転させることで記録する方法がある。As a method for recording information on this recording medium,
A light beam such as a laser beam is focused on a recording medium through an objective lens, and the coercive force of the recording medium is reduced by raising the temperature of the focal point on the recording medium to the Curie point. There is a method of recording by applying a magnetic field higher than the magnetic force from the outside to reverse the magnetization.
【０００４】このような記録方式による光記録再生装置
については、特開平９−１８５８５２公報に開示されて
いる。An optical recording / reproducing apparatus using such a recording system is disclosed in Japanese Patent Application Laid-Open No. 9-185852.
【０００５】以下に図を用いて、従来の光記録再生装置
について説明する。A conventional optical recording / reproducing apparatus will be described below with reference to the drawings.
【０００６】図５は従来の光記録再生装置の光学ヘッド
部分であり、レーザービーム等の光ビーム１２を記録媒
体１１に集束する対物レンズ１３と透光性基板１４上に
形成された磁界を発生させる磁界発生装置１５とが一体
に構成され、記録媒体１１に対して同一面側に配置され
ている。FIG. 5 shows an optical head portion of a conventional optical recording / reproducing apparatus, which generates an objective lens 13 for focusing a light beam 12 such as a laser beam on a recording medium 11 and a magnetic field formed on a light transmitting substrate 14. The magnetic field generating device 15 is integrally formed with the recording medium 11, and is arranged on the same surface side with respect to the recording medium 11.
【０００７】このように構成された光記録再生装置にお
いて、光源から出射された光ビーム１２を対物レンズ１
３により集束して記録媒体１１に照射し、この光ビーム
１２の照射された部分をキュリー点以上に加熱すると共
に、磁界発生装置１５から磁界を印加することで情報信
号の記録を行うものである。In the optical recording / reproducing apparatus thus configured, the light beam 12 emitted from the light source is
3 and irradiates the recording medium 11 with the light, the part irradiated with the light beam 12 is heated above the Curie point, and an information signal is recorded by applying a magnetic field from the magnetic field generator 15. .
【０００８】[0008]
【発明が解決しようとする課題】一般に磁界発生装置
は、記録動作時、コイルへの通電により発熱する。Generally, a magnetic field generating device generates heat by energizing a coil during a recording operation.
【０００９】しかし従来の光学ヘッドでは対物レンズと
透光性基板と磁界発生装置が一体に構成されているた
め、磁界発生装置のコイルの発熱が透過性基板から直接
対物レンズに伝わり、対物レンズ内の温度分布による温
度の高低差から対物レンズの屈折率が変化し、球面収差
を増加させてしまうという問題点があった。However, in the conventional optical head, since the objective lens, the translucent substrate, and the magnetic field generator are integrally formed, the heat generated by the coil of the magnetic field generator is transmitted directly from the transmissive substrate to the objective lens. However, there is a problem that the refractive index of the objective lens changes due to the difference in temperature due to the temperature distribution, and the spherical aberration increases.
【００１０】また、発熱によりコイルの損失が増加し、
磁界効率が悪化するため電力の増加を招き、最悪の場合
にはコイル自体を断線させてしまう恐れもある。In addition, heat loss increases the coil loss,
Since the magnetic field efficiency deteriorates, the power is increased, and in the worst case, the coil itself may be disconnected.
【００１１】本発明は上記問題点を解決するものであっ
て、小型且つ簡単な構成で放熱効果の高い光学ヘッドを
提供することを目的とする。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an optical head having a small and simple structure and having a high heat radiation effect.
【００１２】[0012]
【課題を解決するための手段】請求項１に記載の光学ヘ
ッドは、レーザービーム等の光源からの光ビームを記録
媒体に集束する対物レンズと、前記記録媒体に対して前
記対物レンズと同じ側に配置した磁界発生手段と、を有
する光記録再生装置の光学ヘッドにおいて、前記磁界発
生手段が、前記磁界発生手段で発生する熱を放熱させる
放熱手段上に形成されていることを特徴とする。An optical head according to claim 1, wherein an objective lens for focusing a light beam from a light source such as a laser beam on a recording medium, and the same side of the recording medium as the objective lens. Wherein the magnetic field generating means is formed on a heat radiating means for radiating heat generated by the magnetic field generating means.
【００１３】請求項２に記載の光学ヘッドは、請求項１
に記載の光学ヘッドにおいて、前記放熱手段が、光透過
性を有する基板上に前記光透過性を有する基板よりも熱
伝導率の高い材料で形成されていることを特徴とする。[0013] The optical head according to the second aspect is the first aspect.
Wherein the heat radiating means is formed of a material having a higher thermal conductivity on a light-transmitting substrate than on the light-transmitting substrate.
【００１４】請求項３に記載の光学ヘッドは、請求項１
に記載の光学ヘッドにおいて、前記放熱手段が、光透過
性を有し、且つ、前記対物レンズよりも熱伝導率の高い
基板であることを特徴とする。The optical head according to the third aspect is the first aspect.
Wherein the heat radiating means is a substrate having a light transmitting property and a higher thermal conductivity than the objective lens.
【００１５】請求項４に記載の光学ヘッドは、請求項２
又は請求項３に記載の光学ヘッドにおいて、前記放熱手
段の少なくとも一部が、前記対物レンズを保持する対物
レンズ保持手段と接触していることを特徴とする。The optical head according to the fourth aspect is the second aspect.
Alternatively, in the optical head according to claim 3, at least a part of the heat radiating unit is in contact with an objective lens holding unit that holds the objective lens.
【００１６】請求項５に記載の光学ヘッドは、請求項４
に記載の光学ヘッドにおいて、前記対物レンズ保持手段
が、側面に溝状の切欠き部を有することを特徴とする。The optical head according to the fifth aspect is the fourth aspect.
Wherein the objective lens holding means has a groove-shaped notch on a side surface.
【００１７】[0017]
【発明の実施の形態】以下本発明の実施の形態を図に基
づいて説明する。なお、これらの図において同一の構成
要素には同一の符号を付して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In these drawings, the same components will be described with the same reference numerals.
【００１８】（実施の形態１）図１は本発明の第１の実
施の形態を示す光学ヘッドの断面図、図２はその分解斜
視図である。(Embodiment 1) FIG. 1 is a sectional view of an optical head showing a first embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.
【００１９】図において、１は記録媒体、２は光ビー
ム、３は対物レンズ、４ａは光学ガラスＳＦ８（透光性
基板）、４ｂはＤＬＣ膜（熱伝導層）、７は磁界発生装
置、８はレンズホルダーである。In the figure, 1 is a recording medium, 2 is a light beam, 3 is an objective lens, 4a is an optical glass SF8 (light-transmitting substrate), 4b is a DLC film (heat conductive layer), 7 is a magnetic field generator, 8 Is a lens holder.
【００２０】対物レンズ３は光学ガラスＳＦ８であり、
周囲に放熱溝９が形成されたアルミニウム製のレンズホ
ルダー８に保持されている。The objective lens 3 is an optical glass SF8,
It is held by an aluminum lens holder 8 having a heat radiation groove 9 formed around it.
【００２１】また、光学ガラス４ａは、光学ガラス４ａ
の光ビーム２の光路部以外の領域表面に成膜されたＤＬ
Ｃ膜４ｂの表面の少なくとも一部がレンズホルダー８の
端面１０と接触した状態で保持されている。The optical glass 4a is an optical glass 4a.
Formed on the surface of the region other than the optical path of the light beam 2
At least a part of the surface of the C film 4 b is held in contact with the end face 10 of the lens holder 8.
【００２２】ＤＬＣ４ｂ表面にはコイル５と磁性コア６
で構成された磁界発生装置７がＣＶＤ、ＰＶＤ、粉体塗
布等の既知の薄膜プロセスによって形成されている。The coil 5 and the magnetic core 6 are provided on the surface of the DLC 4b.
Is formed by a known thin film process such as CVD, PVD, powder coating and the like.
【００２３】以下に本実施の形態における光学ヘッドの
情報記録時の動作を説明する。レーザービーム等の光源
から発せられた光ビーム２は、対物レンズ３によって集
束され、記録媒体１に照射される。The operation of the optical head according to the present embodiment when recording information will be described below. A light beam 2 emitted from a light source such as a laser beam is focused by an objective lens 3 and irradiated on a recording medium 1.
【００２４】そして磁界発生装置７によって磁界を発生
させ、その磁界を記録媒体１の光ビーム２が照射されて
いる位置に印加する。Then, a magnetic field is generated by the magnetic field generator 7 and the magnetic field is applied to the recording medium 1 at the position where the light beam 2 is irradiated.
【００２５】このとき磁界発生装置７のコイル５への通
電によって発生した熱は、磁性コア６から光学ガラス４
ａより熱伝導率の高いＤＬＣ膜４ｂを伝ってレンズホル
ダー８の端面１０に伝わり、レンズホルダー８の放熱溝
９から空気中に放熱される。At this time, heat generated by energizing the coil 5 of the magnetic field generator 7 is transferred from the magnetic core 6 to the optical glass 4.
The light is transmitted to the end face 10 of the lens holder 8 through the DLC film 4b having a higher thermal conductivity than a, and is radiated into the air from the heat radiation groove 9 of the lens holder 8.
【００２６】このようにコイル５から発生した熱は、磁
性コア６から光学ガラス４ａに成膜されたＤＬＣ膜、そ
してレンズホルダー８へと伝わるため、コイル５や対物
レンズ３に熱が篭ることが無く、光学ガラス４ａ内の温
度分布および光学ヘッド全体の温度分布を均一化するこ
とができ、対物レンズの屈折率変化による球面収差の増
加を防ぎ、発熱による磁界効率の低下を減少させること
ができる。Since the heat generated from the coil 5 is transmitted from the magnetic core 6 to the DLC film formed on the optical glass 4a and the lens holder 8, the heat may be trapped in the coil 5 and the objective lens 3. In addition, the temperature distribution in the optical glass 4a and the temperature distribution in the entire optical head can be made uniform, an increase in spherical aberration due to a change in the refractive index of the objective lens can be prevented, and a decrease in magnetic field efficiency due to heat generation can be reduced. .
【００２７】尚、本実施例では光学ガラス４ａ上に熱伝
導層としてＤＬＣ膜を使用しているが、他材料として表
１に示すような光学ガラス４ａに比べて熱伝導率の高い
材料を使用してもよい。In this embodiment, a DLC film is used as a heat conductive layer on the optical glass 4a, but a material having a higher thermal conductivity than the optical glass 4a shown in Table 1 is used as another material. May be.
【００２８】[0028]
【表１】 [Table 1]
【００２９】また、レンズホルダー８も光学ガラス４ａ
よりも熱伝導率の高い材料であればアルミニウム以外で
もよい。The lens holder 8 is also made of the optical glass 4a.
A material other than aluminum may be used as long as it has a higher thermal conductivity than that of aluminum.
【００３０】（実施の形態２）図３は本発明の第２の実
施の形態を示す光学ヘッドの断面図、図４はその分解斜
視図である。(Embodiment 2) FIG. 3 is a sectional view of an optical head showing a second embodiment of the present invention, and FIG. 4 is an exploded perspective view thereof.
【００３１】本実施例においては、磁界発生装置７が、
少なくとも表面の一部がレンズホルダー８の端面１０と
接触して保持されるダイヤモンド基板４ｃの表面にＣＶ
Ｄ、ＰＶＤ、粉体塗布等の薄膜プロセスで形成される他
は、実施の形態１と同様の構造である。In this embodiment, the magnetic field generator 7 is
CV is applied to the surface of the diamond substrate 4c at least part of the surface of which is held in contact with the end face 10 of the lens holder 8.
The structure is the same as that of the first embodiment except that it is formed by a thin film process such as D, PVD, powder coating and the like.
【００３２】以下に本実施の形態における光学ヘッドの
情報記録時の動作を説明する。光ビーム２は対物レンズ
３によって集束され記録媒体１に照射される。The operation of the optical head according to the present embodiment when recording information will now be described. The light beam 2 is converged by the objective lens 3 and irradiates the recording medium 1.
【００３３】そして磁界発生装置７によって磁界を発生
させ、その磁界を記録媒体１の光ビーム２が照射されて
いる位置に印加する。Then, a magnetic field is generated by the magnetic field generator 7, and the magnetic field is applied to the recording medium 1 at the position where the light beam 2 is irradiated.
【００３４】このとき磁界発生装置７のコイル５への通
電によって発生した熱は、磁性コア６からダイヤモンド
基板４ｃを伝ってレンズホルダー８の端面１０に伝わ
り、レンズホルダー８の放熱溝９から空気中に放熱され
る。At this time, the heat generated by energizing the coil 5 of the magnetic field generator 7 is transmitted from the magnetic core 6 to the end face 10 of the lens holder 8 via the diamond substrate 4c, and from the heat radiation groove 9 of the lens holder 8 to the air. The heat is dissipated.
【００３５】このようにコイル５から発生した熱は、磁
性コア６からダイヤモンド基板４ｃ、そしてレンズホル
ダー８へと伝わるため、コイル５や対物レンズ３に熱が
篭ることが無く、ダイヤモンド基板４ｃ内の温度分布お
よび光学ヘッド全体の温度分布を均一化することがで
き、対物レンズの屈折率変化による球面収差の増加を防
ぎ、発熱による磁界効率の低下を減少させることができ
る。As described above, the heat generated from the coil 5 is transmitted from the magnetic core 6 to the diamond substrate 4c and then to the lens holder 8, so that the coil 5 and the objective lens 3 are not trapped and the heat inside the diamond substrate 4c The temperature distribution and the temperature distribution of the entire optical head can be made uniform, an increase in spherical aberration due to a change in the refractive index of the objective lens can be prevented, and a decrease in magnetic field efficiency due to heat generation can be reduced.
【００３６】[0036]
【発明の効果】以上のように請求項１、２、３の発明に
よれば、磁界発生装置を放熱手段を有する基板上に形成
したことにより、磁界発生装置の形成された基板内の温
度分布を均一化でき、対物レンズの球面収差の増加の防
止および発熱による磁界効率の低下を減少させることが
できる。As described above, according to the first, second, and third aspects of the present invention, the magnetic field generator is formed on the substrate having the heat radiating means, so that the temperature distribution in the substrate on which the magnetic field generator is formed is provided. Can be made uniform, the increase in spherical aberration of the objective lens can be prevented, and the decrease in magnetic field efficiency due to heat generation can be reduced.
【００３７】また、請求項４の発明によれば、磁界発生
装置で発生した熱をレンズホルダーへ放熱手段を介して
伝えることができるため、放熱効果を高めることができ
る。According to the invention of claim 4, since the heat generated by the magnetic field generator can be transmitted to the lens holder through the heat radiating means, the heat radiating effect can be enhanced.
【００３８】また、請求項５の発明によれば、レンズホ
ルダーが放熱溝を有するため、更に放熱効果を高めるこ
とができる。According to the fifth aspect of the present invention, since the lens holder has the heat radiation groove, the heat radiation effect can be further enhanced.
【図１】本発明の第１の実施の形態を示す断面図であ
る。FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
【図２】本発明の第１の実施の形態を示す分解斜視図で
ある。FIG. 2 is an exploded perspective view showing the first embodiment of the present invention.
【図３】本発明の第２の実施の形態を示す断面図であ
る。FIG. 3 is a sectional view showing a second embodiment of the present invention.
【図４】本発明の第２の実施の形態を示す分解斜視図で
ある。FIG. 4 is an exploded perspective view showing a second embodiment of the present invention.
【図５】従来例を示す断面図である。FIG. 5 is a sectional view showing a conventional example.
１，１１ 記録媒体 ２，１２ 光ビーム ３，１３ 対物レンズ ４ａ 光学ガラス ４ｂ 熱伝導層 ４ｃ 熱伝導基板 ５，１５ コイル ６ 磁性コア ７ 磁界発生装置 ８ レンズホルダー ９ 放熱溝 １０ 端面 １４ 透光性基板 DESCRIPTION OF SYMBOLS 1,11 Recording medium 2,12 Light beam 3,13 Objective lens 4a Optical glass 4b Heat conduction layer 4c Heat conduction substrate 5,15 Coil 6 Magnetic core 7 Magnetic field generator 8 Lens holder 9 Heat radiation groove 10 End face 14 Translucent substrate
Claims (5)
を記録媒体に集束する対物レンズと、前記記録媒体に対
して前記対物レンズと同じ側に配置した磁界発生手段
と、を有する光記録再生装置の光学ヘッドにおいて、 前記磁界発生手段は、前記磁界発生手段で発生する熱を
放熱させる放熱手段上に形成されていることを特徴とす
る光学ヘッド。1. An optical recording / reproducing apparatus comprising: an objective lens for focusing a light beam from a light source such as a laser beam onto a recording medium; and a magnetic field generating means disposed on the same side of the recording medium as the objective lens. The optical head according to claim 1, wherein the magnetic field generating means is formed on a heat radiating means for radiating heat generated by the magnetic field generating means.
上に前記光透過性を有する基板よりも熱伝導率の高い材
料で形成されていることを特徴とする請求項１に記載の
光学ヘッド。2. The optical device according to claim 1, wherein the heat radiating means is formed of a material having a higher thermal conductivity on the light transmitting substrate than on the light transmitting substrate. head.
つ、前記対物レンズよりも熱伝導率の高い基板であるこ
とを特徴とする請求項１に記載の光学ヘッド。3. The optical head according to claim 1, wherein the heat radiating means is a substrate having a light transmitting property and having a higher thermal conductivity than the objective lens.
対物レンズを保持する対物レンズ保持手段と接触してい
ることを特徴とする請求項２又は請求項３に記載の光学
ヘッド。4. The optical head according to claim 2, wherein at least a part of the heat radiating unit is in contact with an objective lens holding unit that holds the objective lens.
の切欠き部を有することを特徴とする請求項４に記載の
光学ヘッド。5. The optical head according to claim 4, wherein the objective lens holding means has a groove-shaped notch on a side surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10349484A JP2000173123A (en) | 1998-12-09 | 1998-12-09 | Optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10349484A JP2000173123A (en) | 1998-12-09 | 1998-12-09 | Optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000173123A true JP2000173123A (en) | 2000-06-23 |
Family
ID=18404063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10349484A Pending JP2000173123A (en) | 1998-12-09 | 1998-12-09 | Optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000173123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100438582B1 (en) * | 2001-12-24 | 2004-07-02 | 엘지전자 주식회사 | Slider head apparatus of magneto-optic recording/reproducing system |
| US7804743B2 (en) * | 2005-04-05 | 2010-09-28 | Hitachi, Ltd. | Thermally assisted magnetic recording head and method of manufacturing the same |
-
1998
- 1998-12-09 JP JP10349484A patent/JP2000173123A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100438582B1 (en) * | 2001-12-24 | 2004-07-02 | 엘지전자 주식회사 | Slider head apparatus of magneto-optic recording/reproducing system |
| US7804743B2 (en) * | 2005-04-05 | 2010-09-28 | Hitachi, Ltd. | Thermally assisted magnetic recording head and method of manufacturing the same |
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