JPS63164028A - Objective lens driver - Google Patents
Objective lens driverInfo
- Publication number
- JPS63164028A JPS63164028A JP31495286A JP31495286A JPS63164028A JP S63164028 A JPS63164028 A JP S63164028A JP 31495286 A JP31495286 A JP 31495286A JP 31495286 A JP31495286 A JP 31495286A JP S63164028 A JPS63164028 A JP S63164028A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- cover
- driving device
- spring
- lens holder
- 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
- 230000005291 magnetic effect Effects 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 229910000889 permalloy Inorganic materials 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 8
- 230000007257 malfunction Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は光学式情報記録再生装置に係り、特にフォー
カス追従、トラッキング追従を行なうための対物レンズ
駆動装置を備えたものに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical information recording/reproducing device, and particularly to one provided with an objective lens driving device for performing focus follow-up and tracking follow-up.
この発明は対物レンズ駆動装置のカバーを軟磁性材料で
構成することによりカバー内から又はカバーの外から磁
気的な影響を防ぎ誤動作のないものを提供すると共に、
そのカバーを磁気回路のヨークや対物レンズを支持する
台として用いることにより部品点数を削減する。The present invention prevents magnetic influences from inside or outside the cover by configuring the cover of the objective lens drive device with a soft magnetic material, and provides an object that does not malfunction.
The number of parts is reduced by using the cover as a stand for supporting the yoke of the magnetic circuit and the objective lens.
第２図Ａは従来の１実施例の上面破断図、同図Ｂはその
Ｇ−Ｇ断面図、同図Ｃは磁気回路と可動部の上面図、同
図りは可動部の斜視図である。第２図Ｃで対物レンズ１
は対物レンズ保持体２に固定され、同じく２に固定され
たフォーカスコイル３及び４個のトラッキングコイル４
がヨーク７及び磁石８からなる磁気間隙中に置かれ、２
はガイド軸６に嵌合している。ガイド軸６は第２図Ｂに
示すようにヨーク７の台に支持されており、さらにこれ
ら全体がカバー１７に覆われている。フォーカスコイル
３及びトラ７キングコイル４に外部より各々フォーカス
信号、トランキング信号を供給すると、電磁気学的にガ
イド軸方向の力とガイド軸を中心とする偶力が発生し、
対物レンズ保持体２を第２図りに示すように光軸方向Ｆ
及び光軸方向と直交方向Ｔに駆動することができる。つ
まり対物レンズを二軸方向に動かすことができる磁気回
路を構成すると共に、ガイド軸６を支持するヨーク７は
鉄、パーマロイ等の軟磁性材料を溶かして型に流し込む
ロストワックス法、又は軟磁性材料を細かく砕いて高温
高圧で固める焼結法等で作られる。FIG. 2A is a top cutaway view of a conventional embodiment, FIG. 2B is a sectional view taken along the line GG, FIG. 2C is a top view of the magnetic circuit and the movable part, and FIG. Objective lens 1 in Figure 2 C
is fixed to the objective lens holder 2, and a focus coil 3 and four tracking coils 4 also fixed to the objective lens holder 2.
is placed in the magnetic gap consisting of the yoke 7 and the magnet 8, and the 2
is fitted into the guide shaft 6. The guide shaft 6 is supported by a base of a yoke 7, as shown in FIG. 2B, and is further covered entirely by a cover 17. When a focus signal and a trunking signal are supplied to the focus coil 3 and tracking coil 4 from the outside, a force in the direction of the guide axis and a couple force centered on the guide axis are generated electromagnetically.
The objective lens holder 2 is moved in the optical axis direction F as shown in the second diagram.
and can be driven in a direction T orthogonal to the optical axis direction. In other words, it constitutes a magnetic circuit that can move the objective lens in two axial directions, and the yoke 7 that supports the guide shaft 6 is made of a lost wax method in which a soft magnetic material such as iron or permalloy is melted and poured into a mold, or a soft magnetic material is used. It is made by sintering, etc., which involves crushing into small pieces and solidifying them under high temperature and pressure.
カバー１７は、ＡＢＳやナイロン等のプラスチック材料
から射出成形により作られる。The cover 17 is made from a plastic material such as ABS or nylon by injection molding.
従来、対物レンズ駆動装置のカバーは上記のようにプラ
スチックから作られるためスピンドルモータや電磁ソレ
ノイド等の磁界が透過し、対物レンズの動きに誤動作を
与えたり、逆に対物レンズ駆動装置の磁気回路がスピン
ドルモータやディスクに悪影響を及ぼし問題となってい
た。Conventionally, the cover of the objective lens drive device is made of plastic as mentioned above, so the magnetic field of the spindle motor or electromagnetic solenoid passes through it, causing malfunctions in the movement of the objective lens, or conversely, damaging the magnetic circuit of the objective lens drive device. This had a negative effect on the spindle motor and disk, causing problems.
本発明は以上のように磁界がカバーの内外に悪影響を及
ぼさないようにし、さらにそのカバーを磁気回路の一部
として、又アクチュエータを支える支持台として積極的
に活用しようとすることを目的としている。As described above, the present invention aims to prevent the magnetic field from having an adverse effect on the inside and outside of the cover, and to actively utilize the cover as a part of the magnetic circuit and as a support base for supporting the actuator. .
ｃ問題点を解決するための手段〕
上記問題を解決するためこの発明は、カバーを鉄、パー
マロイ等の軟磁性材料又はそれを含むプラスチックや合
金で形状することにより行なう。(c) Means for Solving the Problem] In order to solve the above problem, the present invention is implemented by forming the cover from a soft magnetic material such as iron or permalloy, or a plastic or alloy containing the soft magnetic material.
上記のような材料で形成すると、カバー内及びカバー外
からの磁界はカバーにつかまってしまうため透過できな
い。又このカバーは磁界を外にもらさない性質があるた
め磁石を含む磁気回路としても使うことができ、従来の
ヨークを削減することもできる。When the cover is made of the above-mentioned material, magnetic fields from inside and outside the cover are caught by the cover and cannot pass through. Furthermore, since this cover has the property of not allowing the magnetic field to escape, it can also be used as a magnetic circuit including a magnet, and the conventional yoke can be omitted.
以下にこの発明の実施例を図面に基づいて説明する。第
１図Ａは本実施例の上面図、同図ＢはそのＥ−Ｅ断面図
、同図Ｃはその下面図である。第１図Ｂで対物レンズ１
は対物レンズ保持体２に固定され、同じく２に固定され
たフォーカスコイル３及びトラッキングコイル４がカバ
ー゛の一部と磁石８からなる磁気間隙中に置かれ、２は
ガイド軸６に嵌合している。ガイド軸６もカバー１７に
支持され、２をガイド軸方向とガイド軸回りの二軸方向
に案内する。Embodiments of the present invention will be described below based on the drawings. FIG. 1A is a top view of this embodiment, FIG. 1B is a sectional view taken along the line EE, and FIG. 1C is a bottom view thereof. Objective lens 1 in Figure 1B
is fixed to the objective lens holder 2, and a focusing coil 3 and a tracking coil 4, which are also fixed to 2, are placed in a magnetic gap formed by a part of the cover and a magnet 8, and 2 is fitted into the guide shaft 6. ing. The guide shaft 6 is also supported by the cover 17 and guides the guide shaft 2 in the direction of the guide shaft and in two axial directions around the guide shaft.
フォーカスコイル３及びトラッキングコイル４に外部よ
り各々フォーカス信号、トラッキング信号を供給すると
、電磁気学的にガイド軸方向の力とガイド軸を中心とす
る偶力が発生し、対物レンズ保持体２を光軸方向及び光
軸と直交方向に駆動することができる。つまり対物レン
ズを二軸方向に動かすことができる。When a focus signal and a tracking signal are supplied to the focus coil 3 and the tracking coil 4 from the outside, respectively, a force in the direction of the guide axis and a couple force centered on the guide axis are generated electromagnetically, and the objective lens holder 2 is moved along the optical axis. It can be driven in the direction perpendicular to the optical axis. In other words, the objective lens can be moved in two axes.
この実施例の特徴はカバーをパーマロイ、鉄等の軟磁性
材料又はそれを含むプラスチックや合金で形成したため
外部からの磁界の影響がなく、対物レンズ保持体の誤動
作を防ぐことができる。又カバー内部の磁気回路の影響
も外部に及ぼさないので、スピンドルモータやディスク
への悪影響も防ぐことができる。さらに、カバーがガイ
ド軸を支持すると同時に磁石８と共に磁気回路を形成し
ているため、従来ロストワックス法や、焼結法で成形し
°ζいた高価なヨークを省くことができるので低コスト
化へも寄与している。The feature of this embodiment is that the cover is made of a soft magnetic material such as permalloy or iron, or a plastic or alloy containing the same, so that there is no influence of external magnetic fields, and malfunction of the objective lens holder can be prevented. Furthermore, since the magnetic circuit inside the cover does not have any influence on the outside, it is possible to prevent any adverse effects on the spindle motor or the disk. Furthermore, since the cover supports the guide shaft and at the same time forms a magnetic circuit together with the magnet 8, it is possible to eliminate the expensive yoke that was conventionally molded using the lost wax method or sintering method, resulting in lower costs. is also contributing.
この発明は以上説明したように、従来プラスチックで作
られていたカバーをパーマロイ、鉄等の軟磁性材料又は
それを含むプラスチックや合金で形成することにより、
外部からの磁界の影響を受けない又は外部に磁界の影響
を与えない対物レンズ駆動装置を促供することができる
。さらにこのカバーをヨークやアクチュエータ支持台と
して用いることができるので、部品点数を削減する効果
もある。As explained above, this invention enables the cover, which was conventionally made of plastic, to be made of a soft magnetic material such as permalloy or iron, or a plastic or alloy containing the same.
It is possible to provide an objective lens driving device that is not influenced by an external magnetic field or is not influenced by a magnetic field externally. Furthermore, since this cover can be used as a yoke or an actuator support, the number of parts can be reduced.
第１図Ａは本発明の対物レンズ駆動装置の上面図、第１
図Ｂは第１図ＡのＥ−Ｅ断面図、第１図Ｃは第１図Ａの
下面図、第２図Ａは従来の対物レンズ駆動装置の部分破
断図、第２図Ｂは第２図ＡのＧ−Ｇ断面図、第２図Ｃは
第２図Ａからカバーを除いた上面図、第２図りは第２図
Ａの可動部の斜視図である。
１・・・対物レンズ
２・・・対物レンズ保持体
３・・・フォーカスコイル
４・・・トラッキングコイル
５・・・基板
６・・・カイト軸
７・・・ヨーク
８・・・磁石
１７・・・カバー
以上
出願人 セイコー電子工業株式会社
本発明のＴ１１ダＬンズ駈ｅ’ａ置の上面図３１ 図
Ａ
竪１ｅ］ＡのＥ−Ｅ吋面図
第１ 図 Ｂ
第１図Ａの下面図
第１図Ｃ
４Ｌ来の対物しソズ駆やｈＨ置の部分破餌図第２図Ａ
第２図ＡのＧ−Ｇｄ？ｒｉ図
第２図 ＢFIG. 1A is a top view of the objective lens driving device of the present invention.
Figure B is a sectional view taken along line E-E in Figure 1A, Figure 1C is a bottom view of Figure 1A, Figure 2A is a partially cutaway view of a conventional objective lens drive device, and Figure 2B is a cross-sectional view of the conventional objective lens drive device. FIG. 2C is a top view of FIG. 2A with the cover removed, and FIG. 2C is a perspective view of the movable part of FIG. 2A. 1... Objective lens 2... Objective lens holder 3... Focus coil 4... Tracking coil 5... Substrate 6... Kite shaft 7... Yoke 8... Magnet 17...・Cover Applicant Seiko Electronics Co., Ltd. Top view 31 of the T11 dalens cane e'a position of the present invention
A Vertical 1e] E-E back view of A Fig. 1 B Fig. 1 Bottom view of A Fig. 1 C Partial break-up of the 4L objective and hH position Fig. 2 A Fig. 2 A's G-Gd? ri diagram 2nd B
Claims (7)
る対物レンズと、前記対物レンズを保持する対物レンズ
保持体と、前記対物レンズ保持体を弾性的に支える手段
と、前記対物レンズ保持体に固定され対物レンズを光軸
方向及び光軸の直交方向の二軸方向に移動させる力を発
生する２種類のコイルと、前記対物レンズ保持体を二軸
方向に案内する手段と、前記コイルに力を発生させる磁
気回路とからなる対物レンズ駆動装置において、前記対
物レンズ駆動装置をパーマロイ、鉄等の軟磁性材料又は
それを含むプラスチックや合金からなるカバーで覆った
ことを特徴とする対物レンズ駆動装置。(1) An objective lens that focuses light from a light source on a recording surface as a light spot, an objective lens holder that holds the objective lens, means for elastically supporting the objective lens holder, and the objective lens holder. two types of coils that are fixed to the body and generate forces to move the objective lens in two axial directions: an optical axis direction and a direction perpendicular to the optical axis; a means for guiding the objective lens holder in the two axial directions; and the coils. an objective lens drive device comprising a magnetic circuit that generates a force, characterized in that the objective lens drive device is covered with a cover made of a soft magnetic material such as permalloy or iron, or a plastic or alloy containing the same. Drive device.
ことを特徴とする特許請求の範囲第１項記載の対物レン
ズ駆動装置。(2) The objective lens driving device according to claim 1, wherein the magnetic circuit consists of a magnet and a yoke, or only a magnet.
徴とする特許請求の範囲第１項記載の対物レンズ駆動装
置。(3) The objective lens driving device according to claim 1, wherein the magnetic circuit consists of a magnet and a part of the cover.
て１個のガイド軸を用い、又対物レンズ保持体を弾性的
に支える手段としてゴムばねを用いることを特徴とする
特許請求の範囲第１項記載の対物レンズ駆動装置。(4) A single guide shaft is used as a means for guiding the objective lens holder in two axial directions, and a rubber spring is used as a means for elastically supporting the objective lens holder. The objective lens driving device according to item 1.
取りつけられたことを特徴とする特許請求の範囲第４項
記載の対物レンズ駆動装置。(5) The objective lens driving device according to claim 4, characterized in that the base on which the guide shaft and the rubber spring are fixed is attached to the cover.
て板ばね、棒ばね等のばねを用いたことを特徴とする特
許請求の範囲第１項記載の対物レンズ駆動装置。(6) The objective lens driving device according to claim 1, wherein a spring such as a leaf spring or a rod spring is used as a means for guiding the objective lens holder in two axial directions.
けたことを特徴とする特許請求の範囲第６項記載の対物
レンズ駆動装置。(7) The objective lens driving device according to claim 6, characterized in that a spring or a stand to which the spring is fixed is attached to the cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31495286A JPS63164028A (en) | 1986-12-25 | 1986-12-25 | Objective lens driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31495286A JPS63164028A (en) | 1986-12-25 | 1986-12-25 | Objective lens driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63164028A true JPS63164028A (en) | 1988-07-07 |
Family
ID=18059637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31495286A Pending JPS63164028A (en) | 1986-12-25 | 1986-12-25 | Objective lens driver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63164028A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5873224A (en) * | 1995-09-07 | 1999-02-23 | Kubota Corporation | Power transmitting structure for a self-propelling vehicle having a working implement |
| JP2006092654A (en) * | 2004-09-24 | 2006-04-06 | Funai Electric Co Ltd | Actuator for optical pickup |
-
1986
- 1986-12-25 JP JP31495286A patent/JPS63164028A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5873224A (en) * | 1995-09-07 | 1999-02-23 | Kubota Corporation | Power transmitting structure for a self-propelling vehicle having a working implement |
| JP2006092654A (en) * | 2004-09-24 | 2006-04-06 | Funai Electric Co Ltd | Actuator for optical pickup |
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