JPH0727655B2 - Optical system drive - Google Patents
Optical system driveInfo
- Publication number
- JPH0727655B2 JPH0727655B2 JP61008113A JP811386A JPH0727655B2 JP H0727655 B2 JPH0727655 B2 JP H0727655B2 JP 61008113 A JP61008113 A JP 61008113A JP 811386 A JP811386 A JP 811386A JP H0727655 B2 JPH0727655 B2 JP H0727655B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- optical system
- tracking
- coil
- driving device
- 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 - Lifetime
Links
Landscapes
- Lens Barrels (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光学系駆動装置に係り、特にコイルが取り付け
られた光学系保持体と、該コイルを横切るように磁界を
形成する磁気回路形成手段とを有する光学系駆動装置に
関する。The present invention relates to an optical system driving device, and more particularly to an optical system holder to which a coil is attached, and a magnetic circuit forming means for forming a magnetic field across the coil. And an optical system driving device having.
従来の光学系駆動装置として、対物レンズ駆動装置につ
いて説明する。An objective lens driving device will be described as a conventional optical system driving device.
第３図は従来の対物レンズ駆動装置の斜視図である。第
３図に示すように、対物レンズ保持体28は軸受を介し
て、基台21に圧入等によって固着された支持軸26に挿入
されており、また支持軸26の近傍には対物レンズ23及び
この対物レンズ23と略同等の重さの重り29が取り付けら
れている。さらにこの重り29の下には不図示の中立点保
持部材が取り付けられている。対物レンズ保持体28の外
周部にはフォーカス用コイル24が巻回されており、さら
にこのフォーカス用コイル24上にはトラッキング用コイ
ル25b及び不図示のトラッキング用コイル25a（支持軸26
について、トラッキング用コイル25bの反対の位置に取
り付けてある）が取り付けられている。フォーカス用コ
イル24に対向するように、対物レンズ保持体28の外周部
及び内周部の近傍に対向磁極を形成したフォーカス用永
久磁石27a,27bが基台21に固着され、またトラッキング
用コイル25a,25bに対向するように、対物レンズ保持体2
8の外周部近傍にトラッキング用永久磁石22a,22bが固着
される。フォーカス用コイル24とトラッキング用コイル
25a,25bとに流れる電流と各々のコイルに対して形成さ
れる磁界とによって生ずる電磁力によって、対物レンズ
保持体28は支持軸26を中心にして上下摺動，左右回動さ
れる。FIG. 3 is a perspective view of a conventional objective lens driving device. As shown in FIG. 3, the objective lens holder 28 is inserted through a bearing into a support shaft 26 fixed to the base 21 by press fitting or the like, and in the vicinity of the support shaft 26, the objective lens 23 and A weight 29 having substantially the same weight as the objective lens 23 is attached. Further, a neutral point holding member (not shown) is attached under the weight 29. A focusing coil 24 is wound around the outer periphery of the objective lens holder 28, and a tracking coil 25b and a tracking coil 25a (not shown) (support shaft 26) are wound on the focusing coil 24.
Is attached to the position opposite to the tracking coil 25b). Focusing permanent magnets 27a, 27b having opposing magnetic poles formed in the vicinity of the outer peripheral portion and the inner peripheral portion of the objective lens holder 28 so as to face the focusing coil 24 are fixed to the base 21 and the tracking coil 25a. , 25b so that the objective lens holder 2
Tracking permanent magnets 22a and 22b are fixed near the outer peripheral portion of 8. Focus coil 24 and tracking coil
The objective lens holder 28 is vertically slid and horizontally rotated about the support shaft 26 by the electromagnetic force generated by the currents flowing through the coils 25a and 25b and the magnetic fields formed on the respective coils.
上記の対物レンズ駆動装置において、対物レンズ保持体
は従来アルミニウムを使用していた。しかしながら、ア
ルミニウムは導電率が高いのでうず電流が発生して、対
物レンズ保持体28の高周波域における応答性能を悪くし
てしまう。そのために、対物レンズ保持体にスリットを
入れてうず電流の発生を防止する工夫が必要となるが、
対物レンズ保持体の強度が低下してしまう問題点があっ
た。In the above-mentioned objective lens driving device, the objective lens holder has conventionally used aluminum. However, since aluminum has a high conductivity, an eddy current is generated, which deteriorates the response performance of the objective lens holder 28 in the high frequency range. Therefore, it is necessary to make a slit in the objective lens holder to prevent the generation of eddy currents.
There is a problem that the strength of the objective lens holder decreases.
本発明の目的は軽量で電気絶縁性及び剛性の優れた光学
系保持体を提供し、フォーカス制御及びトラッキング制
御の追従性能が優れ、高周波域においても性能の劣化し
ない光学系駆動装置を提供することにある。An object of the present invention is to provide an optical system holder that is lightweight and has excellent electrical insulation and rigidity, and provides an optical system driving device that has excellent tracking performance for focus control and tracking control and that does not deteriorate in high frequency range. It is in.
上記の問題点はコイルが取り付けられた光学系保持体
と、該コイルを横切るように磁界を形成する磁気回路形
成手段とを有する光学系駆動装置において、前記光学系
保持体が、主としてガラス繊維を充填した液晶高分子材
料からなることを特徴とする本発明の光学系駆動装置に
よって解決される。The above problem is an optical system driving device having an optical system holder to which a coil is attached and a magnetic circuit forming means for forming a magnetic field so as to traverse the coil, wherein the optical system holder mainly comprises glass fiber. This is solved by the optical system driving device of the present invention, which is characterized in that the liquid crystal polymer material is filled.
本発明の光学系駆動装置は光学系保持体に主としてガラ
ス繊維を充填した液晶高分子材料を用いたことにより、
導電率を低くし、うず電流の発生を抑え、又剛性を持た
せ且つ軽量化することができる。The optical system driving device of the present invention uses a liquid crystal polymer material mainly filled with glass fiber in the optical system holder,
The conductivity can be lowered, the generation of eddy current can be suppressed, and the rigidity and the weight can be reduced.
以下、本発明の実施例を図面を用いて詳細に説明する。
なお本発明の光学系駆動装置として対物レンズ駆動装置
について説明する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
An objective lens driving device will be described as an optical system driving device of the present invention.
第１図は本発明の対物レンズ駆動装置の一実施例の分解
斜視図である。FIG. 1 is an exploded perspective view of an embodiment of the objective lens driving device of the present invention.
第１図において、対物レンズ保持体１は軸受14を介し
て、支持軸11に挿入される。前記軸受14の近傍には対物
レンズ２及び重量バランスを保つために該対物レンズ２
とほぼ同様の重量の重り12が取り付けられている。対物
レンズ保持体１の外周部にはフォーカス用コイル３が巻
回されており、その下に矩形のトラッキング用コイル4
a,4bが取り付けられている。In FIG. 1, the objective lens holder 1 is inserted into a support shaft 11 via a bearing 14. The objective lens 2 is provided in the vicinity of the bearing 14 and the objective lens 2 for maintaining the weight balance.
A weight 12 of about the same weight as is attached. A focusing coil 3 is wound around the outer periphery of the objective lens holder 1, and a rectangular tracking coil 4 is provided below the focusing coil 3.
a and 4b are attached.
支持軸11は光学ヘッド９に直接圧入等で固着され、光学
ヘッド９に設けられた光学系の光軸との傾きを容易に0.
1゜以下に抑えることができる。また光学ヘッド９には
トラッキング用コイル4a,4bに対向するように、対物レ
ンズ保持体１の外周部近傍にトラッキング用永久磁石7
a,7b,7c,7d及びこれらのトラッキング用永久磁石を挾む
ように非磁性体13が固着される。The support shaft 11 is fixed to the optical head 9 by direct press-fitting or the like so that the inclination with respect to the optical axis of the optical system provided in the optical head 9 can be easily reduced to 0.
It can be kept below 1 °. The optical head 9 has a tracking permanent magnet 7 near the outer peripheral portion of the objective lens holder 1 so as to face the tracking coils 4a and 4b.
A non-magnetic body 13 is fixed so as to sandwich the a, 7b, 7c, 7d and these tracking permanent magnets.
なお、トラッキング用コイル4a及びトラッキング用永久
磁石7a,7bは不図示であるが、支持軸11について、夫々
トラッキング用コイル4b及びトラッキング用永久磁石7
c,7dの反対の位置に取り付けられている。Although the tracking coil 4a and the tracking permanent magnets 7a and 7b are not shown, the tracking coil 4b and the tracking permanent magnet 7 are respectively provided for the support shaft 11.
It is attached at the opposite position of c and 7d.
トラッキング用永久磁石7a〜7d及び非磁性体13の上には
フォーカス用永久磁石6a,6bがフォーカス用コイル３に
対向するように固着される。トラッキング用永久磁石7a
〜7d及びフォーカス用永久磁石6a,6bの対向磁極として
ヨーク8a,8bが、対物レンズ保持体１の内周部の近傍で
且つ内周部と対向するように固着される。フォーカス用
コイル３とトラッキング用コイル4a,4bは別々に取り付
けられているので、フォーカス用永久磁石6a,6b及びト
ラッキング用永久磁石7a〜7dとヨーク8a,8bとの間隔は
より狭くなり磁束密度が増している。Focusing permanent magnets 6a and 6b are fixed on the tracking permanent magnets 7a to 7d and the non-magnetic body 13 so as to face the focusing coil 3. Tracking permanent magnet 7a
˜7d and yokes 8a, 8b as opposite magnetic poles of the focusing permanent magnets 6a, 6b are fixed near the inner peripheral portion of the objective lens holder 1 so as to face the inner peripheral portion. Since the focusing coil 3 and the tracking coils 4a and 4b are separately attached, the spacing between the focusing permanent magnets 6a and 6b and the tracking permanent magnets 7a to 7d and the yokes 8a and 8b becomes narrower, and the magnetic flux density becomes smaller. It is increasing.
トラッキング用永久磁石7a〜7d、ヨーク8a,8b、非磁性
体13は直接光学ヘッド９に接着剤等で取り付けられる。The tracking permanent magnets 7a to 7d, the yokes 8a and 8b, and the nonmagnetic body 13 are directly attached to the optical head 9 with an adhesive or the like.
対物レンズ保持体１の中立点保持は光学ヘッド９に固着
された中立点保持ゴム５によって行われる。対物レンズ
保持体１は保持範囲内で左右回動及び上下摺動可能であ
る。The neutral point holding of the objective lens holder 1 is performed by the neutral point holding rubber 5 fixed to the optical head 9. The objective lens holder 1 can be rotated left and right and vertically slidable within a holding range.
第２図は対物レンズ保持体を組み込んだ場合の対物レン
ズ駆動装置のAA′方向の縦断面図である。FIG. 2 is a vertical sectional view in the AA ′ direction of the objective lens driving device when the objective lens holder is incorporated.
第２図に示すように、フォーカス用永久磁石6a,6bとト
ラッキング用永久磁石7a,7cとにおいて異極同志で平行
に載置するとそれぞれのコイルに対して垂直に磁界が発
生せず、フォーカス制御及びトラッキング制御ができな
くなるので、同極同志を平行に載置してある。フォーカ
ス用永久磁石6a,6bとトラッキング用永久磁石7b,7dにお
いても同様に載置される。トラッキング用永久磁石7a,7
b,7c,7dの間は非磁性体13を載置し磁界の乱れを防ぐ。
本実施例においては、トラッキング用コイル4a,4b2つに
対してトラッキング用永久磁石7a〜7d4つを設けた例を
示したが、トラッキング用コイル４つに対してトラッキ
ング用永久磁石２つを設けた場合にも適用できる。As shown in FIG. 2, when the focusing permanent magnets 6a and 6b and the tracking permanent magnets 7a and 7c are placed in parallel with each other with different polarities, a magnetic field is not generated perpendicularly to each coil, and focus control is performed. Since the tracking control cannot be performed, the same poles are placed in parallel. The focusing permanent magnets 6a and 6b and the tracking permanent magnets 7b and 7d are similarly placed. Tracking permanent magnets 7a, 7
A non-magnetic body 13 is placed between b, 7c and 7d to prevent disturbance of the magnetic field.
In this embodiment, an example in which four tracking permanent magnets 7a to 7d are provided for the two tracking coils 4a and 4b has been shown, but two tracking permanent magnets are provided for the four tracking coils. It can also be applied in cases.
対物レンズ保持体１はフォーカスサーボ、トラッキング
サーボをかけるために、フォーカスコイル、トラッキン
グコイルに電流をより多く流し駆動パワーを上げる、対
物レンズ保持体自身の重りを軽くする、対物レンズ保持
体自身の剛性を上げる等の必要がある。In order to apply focus servo and tracking servo to the objective lens holder 1, more current is passed through the focus coil and tracking coil to increase drive power, the weight of the objective lens holder is reduced, and the rigidity of the objective lens holder itself is increased. It is necessary to raise it.
本発明の光学系駆動装置の対物レンズ保持体１は、ガラ
ス繊維を強化材として、ガラス繊維を充填した液晶高分
子材料に対して30〜40重量％入れることにより、軽量で
剛性と電気的絶縁性の優れた対物レンズ保持体を提供す
るものである。The objective lens holder 1 of the optical system driving device of the present invention is lightweight and has rigidity and electrical insulation by incorporating glass fiber as a reinforcing material in an amount of 30 to 40% by weight with respect to the liquid crystal polymer material filled with glass fiber. An objective lens holder having excellent properties is provided.
液晶高分子材料とは、溶融相において液晶性を示す高分
子材料であり、一般にLCP（Liguid Cryatal Polymer）
と呼ばれる。具体的には、例えば全芳香族ポリエステ
ル，芳香族ポリアゾメチン，芳香脂肪族ポリエステル，
芳香族ポリエステルカーボネート，全芳香族又は非全芳
香族ポリエステルアミド等が用いられる。A liquid crystal polymer material is a polymer material that exhibits liquid crystallinity in the molten phase, and is generally LCP (Liguid Cryatal Polymer).
Called. Specifically, for example, wholly aromatic polyester, aromatic polyazomethine, araliphatic polyester,
Aromatic polyester carbonates, wholly aromatic or non-all aromatic polyesteramides, etc. are used.
第１表にアルミニウムとガラス繊維30重量％入り液晶高
分子材料の特性表を示した。Table 1 shows the characteristics of the liquid crystal polymer material containing aluminum and 30% by weight of glass fiber.
第１表のように、ガラス繊維入り液晶高分子材料はアル
ミニウムと比べて、比重が小さく、比強度が大きいの
で、軽量で剛性の要求される光学系保持体に適する。ま
た電気的絶縁性についても、抵抗値が1015〜1016（Ω・
cm）程度の範囲にあり、うず電流はほぼ問題とならな
い。As shown in Table 1, the liquid crystal polymer material containing glass fiber has a smaller specific gravity and a larger specific strength as compared with aluminum, and thus is suitable for an optical system holder that is lightweight and requires rigidity. Regarding electrical insulation, the resistance value is 10 15 to 10 16 (Ω ・
The eddy current is not a problem.
ガラス繊維の割合は30重量％未満であると、ガラス繊維
が少ないために曲げ強度が低下し、また40重量％を超え
ると、液晶高分子材料が少なくなり、ガラス繊維が有効
に寄与しなくなるために同様に曲げ強度が低下する。If the proportion of glass fiber is less than 30% by weight, the bending strength is reduced due to the small amount of glass fiber, and if it exceeds 40% by weight, the amount of liquid crystal polymer material becomes small and the glass fiber does not contribute effectively. Similarly, the bending strength decreases.
本発明の光学系駆動装置に用いる光学系保持体は、ガラ
ス繊維を充填した液晶高分子材料よりなるものはもちろ
ん、これに可塑剤，染顔料，安定剤等を適宜加えたもの
も含まれる。The optical system holder used in the optical system driving device of the present invention includes not only those made of a liquid crystal polymer material filled with glass fiber but also those to which a plasticizer, a dye / pigment, a stabilizer and the like are appropriately added.
〔発明の効果〕 以上詳細に説明したように、本発明の光学系駆動装置に
よれば、軽量で電気的絶縁性と剛性の優れた光学系保持
体を提供し、フォーカス制御及びトラッキング制御の追
従性能が優れ、高周波域においても性能の劣化しない光
学系駆動装置を提供することができる。 [Effects of the Invention] As described in detail above, according to the optical system driving device of the present invention, it is possible to provide an optical system holder that is lightweight and has excellent electrical insulation and rigidity, and to follow focus control and tracking control. It is possible to provide an optical system driving device that has excellent performance and does not deteriorate in high frequency range.
第１図は本発明の対物レンズ駆動装置の一実施例の分解
斜視図である。 第２図は対物レンズ保持体を組み込んだ場合の対物レン
ズ駆動装置AA′方向の縦断面図である。 第３図は従来の対物レンズ駆動装置の斜視図である。 １……対物レンズ保持体、6a,6b……フォーカス用永久
磁石、7a,7b,7c,7d……トラッキング用永久磁石、8a,8b
……ヨーク、９……光学ヘッド、11……支持軸、13……
非磁性体。FIG. 1 is an exploded perspective view of an embodiment of the objective lens driving device of the present invention. FIG. 2 is a vertical sectional view in the direction of the objective lens driving device AA 'when the objective lens holder is incorporated. FIG. 3 is a perspective view of a conventional objective lens driving device. 1 ... Objective lens holder, 6a, 6b ... Focusing permanent magnet, 7a, 7b, 7c, 7d ... Tracking permanent magnet, 8a, 8b
...... Yoke, 9 ...... Optical head, 11 ...... Support shaft, 13 ......
Non-magnetic material.
フロントページの続き (72)発明者 鈴木 康夫 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (56)参考文献 実開 昭60−93122（ＪＰ，Ｕ)Front Page Continuation (72) Inventor Yasuo Suzuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References Shokai Sho 60-93122 (JP, U)
Claims (1)
該コイルを横切るように磁界を形成する磁気回路形成手
段とを有する光学系駆動装置において、前記光学系保持
体が、主としてガラス繊維を充填した液晶高分子材料か
らなることを特徴とする光学系駆動装置。1. An optical system holder to which a coil is attached,
An optical system driving device having a magnetic circuit forming means for forming a magnetic field across the coil, wherein the optical system holder is mainly made of a liquid crystal polymer material filled with glass fiber. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61008113A JPH0727655B2 (en) | 1986-01-20 | 1986-01-20 | Optical system drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61008113A JPH0727655B2 (en) | 1986-01-20 | 1986-01-20 | Optical system drive |
Related Child Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9361095A Division JPH10214429A (en) | 1997-12-26 | 1997-12-26 | Objective lens holder |
| JP9361094A Division JPH10214428A (en) | 1997-12-26 | 1997-12-26 | Optical system drive |
| JP36109397A Division JPH10214427A (en) | 1997-12-26 | 1997-12-26 | Rotating sliding objective lens drive |
| JP36109297A Division JPH10214426A (en) | 1997-12-26 | 1997-12-26 | Objective lens drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62167629A JPS62167629A (en) | 1987-07-24 |
| JPH0727655B2 true JPH0727655B2 (en) | 1995-03-29 |
Family
ID=11684236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61008113A Expired - Lifetime JPH0727655B2 (en) | 1986-01-20 | 1986-01-20 | Optical system drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0727655B2 (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5710641A (en) * | 1980-06-24 | 1982-01-20 | Sumitomo Chem Co Ltd | Wholly aromatic copolyester resin composition |
| JPS5750332A (en) * | 1980-09-05 | 1982-03-24 | Matsushita Electric Ind Co Ltd | Focus actuator |
| JPS58155635U (en) * | 1982-04-14 | 1983-10-18 | 株式会社日立製作所 | Objective lens drive device |
| JPS58185402A (en) * | 1982-04-20 | 1983-10-29 | Osaka Gas Co Ltd | Method for increasing temperature of carbon monoxide converter |
| US4581399A (en) * | 1982-09-30 | 1986-04-08 | Celanese Corporation | Method for the melt processing of thermotropic liquid crystal polymers |
| JPS6093122U (en) * | 1983-11-30 | 1985-06-25 | ソニー株式会社 | optical pick up |
| JPS60138743A (en) * | 1983-12-27 | 1985-07-23 | Toshiba Corp | Objective lens driver |
| JPS60182025A (en) * | 1984-02-28 | 1985-09-17 | Toshiba Corp | Objective lens driver of optical information processing unit |
| JPS60168117U (en) * | 1984-04-16 | 1985-11-08 | 日本電信電話株式会社 | optical fiber unit |
-
1986
- 1986-01-20 JP JP61008113A patent/JPH0727655B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62167629A (en) | 1987-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |