JPH0770081B2 - Objective lens drive - Google Patents
Objective lens driveInfo
- Publication number
- JPH0770081B2 JPH0770081B2 JP2178892A JP17889290A JPH0770081B2 JP H0770081 B2 JPH0770081 B2 JP H0770081B2 JP 2178892 A JP2178892 A JP 2178892A JP 17889290 A JP17889290 A JP 17889290A JP H0770081 B2 JPH0770081 B2 JP H0770081B2
- Authority
- JP
- Japan
- Prior art keywords
- drive coil
- lens holder
- wire
- objective lens
- recess
- 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
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、光ピックアップに用いる対物レンズ駆動装
置、特にその駆動コイルの支持構造に関する。Description: TECHNICAL FIELD The present invention relates to an objective lens driving device used for an optical pickup, and particularly to a support structure for a driving coil thereof.
［従来の技術］ 第４図は従来の対物レンズ駆動装置の平面図である。[Prior Art] FIG. 4 is a plan view of a conventional objective lens driving device.
同図において、レンズホルダ（１）に保持された対物レ
ンズ（２）は、レンズホルダ（１）がシャフト（３）を
支点として変位するため、レンズホルダ（１）と一体に
変位する。レンズホルダ（１）には、バランサ（４）
と、駆動コイル（５）が支持されている。この駆動コイ
ル（５）の自由辺（5f）は、ヨーク（６）とマグネット
（７）とからなる磁気回路中に配置されている。シャフ
ト（３）及びヨーク（６）は、アクチュエータベース
（８）に取り付けられている。In the figure, the objective lens (2) held by the lens holder (1) is displaced together with the lens holder (1) because the lens holder (1) is displaced with the shaft (3) as a fulcrum. The lens holder (1) includes a balancer (4).
And the drive coil (5) is supported. The free side (5f) of the drive coil (5) is arranged in the magnetic circuit composed of the yoke (6) and the magnet (7). The shaft (3) and the yoke (6) are attached to the actuator base (8).
第５図は第４図のＡ−Ａ断面図、第６図は第４図のＣ−
Ｃ矢視側面図である。5 is a sectional view taken along line AA of FIG. 4, and FIG. 6 is taken along line C- of FIG.
It is a C arrow side view.
両図から明らかなように、駆動コイル（５）の自由辺
（5f）は、ヨーク（６）とマグネット（７）との間に形
成される空隙Ｇ内に挿入され、マグネット（７）との間
の小空隙ｇを保つよう配置される。その結果、駆動コイ
ル（５）の自由辺（5f）はマグネット（７）による磁束
Ｂと直交する配置となる。ここで駆動コイル（５）の自
由辺（5f）に紙面表側から裏側に向う電流Ｉを流すと、
フレミングの左手の法則による力Ｆ＝BIlが発生し、自
由辺（5f）はこの力Ｆを第５図上方向に受ける。これに
よりレンズホルダ（１）が上方向に動かされ、対物レン
ズ（２）がフォーカス方向に移動されることになる。As is clear from both figures, the free side (5f) of the drive coil (5) is inserted into the gap G formed between the yoke (6) and the magnet (7), and the free side (5f) is separated from the magnet (7). It is arranged so as to keep a small gap g therebetween. As a result, the free side (5f) of the drive coil (5) is arranged orthogonal to the magnetic flux B generated by the magnet (7). When a current I flowing from the front side to the back side of the drawing is passed through the free side (5f) of the drive coil (5),
A force F = BIl is generated by Fleming's left-hand rule, and the free side (5f) receives this force F in the upward direction in FIG. As a result, the lens holder (1) is moved upward, and the objective lens (2) is moved in the focus direction.
なお、ここでｌは駆動コイル（５）の有効長である。ま
た、駆動コイル（５）に流す電流の方向に逆にすると、
レンズホルダ（１）ひいては対物レンズ（２）は逆に下
向きに移動する。Here, l is the effective length of the drive coil (5). Also, if the direction of the current flowing through the drive coil (5) is reversed,
On the contrary, the lens holder (1) and thus the objective lens (2) move downward.
［発明が解決しようとする課題］ このような動作において、駆動コイル（５）の自由辺
（5f）に高域共振が加わった場合には、第７図に示され
るように大きな変形力（5a）が加わり、自由辺（5f）を
大きく変形させてしまうことがあった。また、第８図に
示されるように、レンズホルダ（１）へ駆動コイル
（５）を接着固定する際に接着剤（11）の一部の厚みが
厚くなる等により、マグネット（７）との空隙ｇが不均
一になってしまうことがあった。[Problems to be Solved by the Invention] In such an operation, when high frequency resonance is applied to the free side (5f) of the drive coil (5), a large deformation force (5a ) Was added, and the free side (5f) could be greatly deformed. Further, as shown in FIG. 8, when the drive coil (5) is fixedly adhered to the lens holder (1), a part of the adhesive (11) becomes thicker so that the magnet (7) and The voids g were sometimes non-uniform.
このように、従来の対物レンズ駆動装置においては、十
分な駆動力を得るために磁束を大きな値としかつ駆動コ
イルとマグネットとの間の空隙を小さく取る必要があっ
た。このため駆動コイルの支持不良による動作不安定や
損傷をもたらすことがあり、また高域共振時に駆動コイ
ルが大きな変形をすることがあった。As described above, in the conventional objective lens driving device, in order to obtain a sufficient driving force, the magnetic flux needs to have a large value and the gap between the driving coil and the magnet needs to be small. As a result, instability or damage may be caused due to poor support of the drive coil, and the drive coil may be largely deformed during high-frequency resonance.
この発明は、かかる課題を解決するためになされたもの
で、駆動コイルのマグネット側への飛び出しを防止し、
かつ駆動コイルの高域共振特性を改善した対物レンズ駆
動装置を提供することを目的とする。The present invention has been made to solve the above problems, and prevents the drive coil from jumping out to the magnet side.
Another object of the present invention is to provide an objective lens driving device in which the high frequency resonance characteristic of the driving coil is improved.
［課題を解決するための手段］ この発明に係る対物レンズ駆動装置は、対物レンズを保
持し、アクチュエータベースに対して少なくとも上下に
移動可能であり、外周に凹部を有するレンズホルダと、
このレンズホルダの凹部に一方の極が位置し、レンズホ
ルダ凹部の外に他方の極が位置するよう、アクチュエー
タベースに対して固定された磁気回路手段と、磁気回路
手段の極のうちレンズホルダ凹部内の極の回りを取り巻
くように巻かれ、自由辺が前記マグネット部材の両極間
に位置するようレンズホルダ凹部に対して固定された駆
動コイルと、レンズホルダ凹部両端のレンズホルダ外周
面に設けられた複数の取付部と、レンズホルダ凹部両端
の取付部の間に、駆動コイルの巻き方向とほぼ等しい方
向に沿って張りわたされ、駆動コイルの自由辺をレンズ
ホルダ方向に押止するワイヤと、ワイヤを駆動コイルの
自由辺に固定する接着補強層と、を有するものである。[Means for Solving the Problem] An objective lens driving device according to the present invention holds a lens, is movable at least up and down with respect to an actuator base, and has a lens holder having a recess on the outer periphery.
Magnetic circuit means fixed to the actuator base so that one pole is located in the recess of the lens holder and the other pole is located outside the recess of the lens holder, and the lens holder recess of the poles of the magnetic circuit means A drive coil wound around the inner pole and fixed to the lens holder recess so that the free side is located between both poles of the magnet member, and provided on the outer peripheral surface of the lens holder at both ends of the lens holder recess. A wire that is stretched between the plurality of mounting portions and the mounting portions at both ends of the concave portion of the lens holder along a direction substantially equal to the winding direction of the drive coil, and presses the free side of the drive coil in the lens holder direction. And an adhesive reinforcement layer for fixing the wire to the free side of the drive coil.
［作用］ この発明の対物レンズ駆動装置においては、駆動コイル
の自由辺がワイヤの引張力によって押止される。これに
より、駆動コイルのマグネット側への飛び出しが阻止さ
れる。[Operation] In the objective lens driving device of the present invention, the free side of the driving coil is stopped by the pulling force of the wire. This prevents the drive coil from jumping out to the magnet side.
また、駆動コイル自由辺には、ワイヤが接着補強層によ
って固定される。これにより、駆動コイルの剛性が高め
られる。この結果、駆動コイルの自由辺の端部が自由端
でなくなるため、共振点が高域に上げられ、高域共振特
性が向上する。Further, the wire is fixed to the free side of the drive coil by the adhesive reinforcing layer. This increases the rigidity of the drive coil. As a result, the end of the free side of the drive coil is not a free end, so that the resonance point is raised to a high range and the high range resonance characteristic is improved.
［実施例］ 次に、図に示す実施例によってこの発明を更に詳細に説
明する。[Embodiment] Next, the present invention will be described in more detail with reference to an embodiment shown in the drawings.
第１図（ａ）においては、レンズホルダ（１）に駆動コ
イル（５）を取り付けた状態が示されている。この発明
においては、特に、レンズホルダ（１）の駆動コイル自
由辺支持端（1b）に取付部（９）が設けられ、駆動コイ
ル（５）の自由辺（5f）の外面に取付部（９）に取り付
けられたワイヤ（10）が張られ、所定のテンションが加
えられている。ワイヤ（10）はテンションが加えられる
ことにより、レンズホルダ（１）のコイル取付面（1a）
に対して駆動コイル（５）を押し付ける。FIG. 1 (a) shows a state where the drive coil (5) is attached to the lens holder (1). In the present invention, in particular, the attachment portion (9) is provided on the drive coil free side supporting end (1b) of the lens holder (1), and the attachment portion (9) is provided on the outer surface of the free side (5f) of the drive coil (5). ) Is attached to the wire (10) and a predetermined tension is applied. The tension is applied to the wire (10), so that the coil mounting surface (1a) of the lens holder (1)
Press the drive coil (5) against.
第１図（ｂ）には、駆動コイル（５）の自由辺（5f）の
側面が示されている。この図においては、ワイヤ（10）
は、接着補強層（12）によって、駆動コイル（５）の自
由辺（5f）に接着固定されている。FIG. 1 (b) shows the side surface of the free side (5f) of the drive coil (5). In this figure, the wire (10)
Is adhesively fixed to the free side (5f) of the drive coil (5) by an adhesive reinforcement layer (12).
このように構成された本実施例の対物レンズ駆動装置に
よれば、駆動コイル（５）は、レンズホルダ（１）のコ
イル取付面（1a）に対して押えつけられ、更にワイヤ
（10）が接着補強層（12）によって固定されることによ
って剛性が高められるため、第１図（ａ）に示す−ｙ方
向への駆動コイル（５）の飛び出しが防止される。According to the objective lens driving device of the present embodiment having such a configuration, the driving coil (5) is pressed against the coil mounting surface (1a) of the lens holder (1), and the wire (10) is further attached. Since the rigidity is increased by being fixed by the adhesion reinforcing layer (12), the drive coil (5) is prevented from protruding in the -y direction shown in Fig. 1 (a).
また、この実施例によれば、駆動コイル（５）には、ワ
イヤ（10）が接着補強層（12）によって固着されるの
で、剛性が格段に高まる。これにより、第３図に示すよ
うに、駆動コイル（５）の高域共振による変形量（5b）
は十分小さくなり、レンズホルダ（１）の変形が十分小
さくなり、対物レンズ（２）への影響をなくすことがで
きる。Further, according to this embodiment, since the wire (10) is fixed to the drive coil (5) by the adhesive reinforcing layer (12), the rigidity is remarkably increased. As a result, as shown in FIG. 3, the deformation amount (5b) due to the high frequency resonance of the drive coil (5).
Is sufficiently small, the deformation of the lens holder (1) is sufficiently small, and the influence on the objective lens (2) can be eliminated.
上記の実施例においては、ワイヤ（10）を左右の取付部
（９）間に一本ずつ張った例を示したが、これに限定さ
れるものではなく、他の張り方をしても良い。In the above embodiment, the wire (10) is stretched one by one between the left and right mounting portions (9), but the present invention is not limited to this, and other tensioning methods may be used. .
例えば第２図（ａ）には、４個設けた取付部（９）に、
ワイヤ（10）をＸ字状に交差させて張った例が示されて
いる。For example, in FIG. 2 (a), four mounting parts (9) are provided,
An example is shown in which the wire (10) is stretched across in an X shape.
第２図（ｂ）には、４個の取付部（９）間に、ワイヤ
（10）をＺ字状に張った例が示され、第２図（ｃ）では
６個設けた取付部（９）に対してジグザグ状にワイヤ
（10）を張った例が示されている。FIG. 2 (b) shows an example in which a wire (10) is stretched in a Z shape between four mounting portions (9), and in FIG. 2 (c), six mounting portions ( An example in which a wire (10) is stretched in a zigzag shape with respect to 9) is shown.
また、第２図（ｄ）においては、四個設けた取付部
（９）の左右の取付部（９）間にそれぞれ二重にワイヤ
（10）を張った例が示されている。In addition, FIG. 2 (d) shows an example in which the wires (10) are doubled between the left and right mounting portions (9) of the four mounting portions (9).
なお、ワイヤ（10）の材質は、銅線、アルミ線、銅クラ
ッドアルミ線、リン青銅線、鋼線、またはビニル線な
ど、一定のテンションに耐えられるものであれば何でも
良い。The wire (10) may be made of any material such as copper wire, aluminum wire, copper clad aluminum wire, phosphor bronze wire, steel wire, or vinyl wire as long as it can withstand a certain tension.
［発明の効果］ 以上説明した通り、本発明によれば、対物レンズ駆動装
置の駆動コイルの自由辺をワイヤによって押止し、ワイ
ヤを接着補強層によって駆動コイルに固定する構造によ
り、駆動コイルの外側への飛び出し、ひいてはマグネッ
トとの接触を防ぐことができると共に、駆動コイルの高
域共振特性の向上するという効果が得られる。[Effects of the Invention] As described above, according to the present invention, the structure in which the free side of the drive coil of the objective lens drive device is stopped by the wire and the wire is fixed to the drive coil by the adhesive reinforcing layer, It is possible to prevent the protrusion to the outside and the contact with the magnet as well as to improve the high-frequency resonance characteristic of the drive coil.
【図面の簡単な説明】 第１図（ａ）はこの発明の一実施例による対物レンズ駆
動装置の駆動コイル部平面図、第１図（ｂ）は同じくこ
の発明の一実施例による駆動コイル部の側面図、第２図
（ａ）、第２図（ｂ）、第２図（ｃ）、第２図（ｄ）は
それぞれこの発明によるワイヤの張り方の異なる実施例
を示す駆動コイル部側面図、第３図はこの発明による駆
動コイル部の高域共振特性の説明図、第４図は従来の対
物レンズ駆動装置の平面図、第５図は従来装置の駆動コ
イル部縦断面図、第６図は従来装置の駆動コイル部側面
図、第７図は従来装置の駆動コイルの高域共振特性の説
明図、第８図は従来装置における駆動コイルの飛び出し
を示す説明図である。 図において、（１）はレンズホルダ、（２）は対物レン
ズ、（３）はシャフト、（４）はバランサ、（５）は駆
動コイル、（６）はヨーク、（７）はマグネット、
（８）はアクチュエータベース、（９）は取付部、（1
0）はワイヤ、（11）は接着剤、（12）は接着補強層で
ある。 なお、各図中同一符号は同一または相当部分を示す。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a plan view of a drive coil portion of an objective lens driving device according to an embodiment of the present invention, and FIG. 1 (b) is a drive coil portion according to an embodiment of the present invention. 2 (a), 2 (b), 2 (c), and 2 (d) are side views of the drive coil section showing different embodiments of the wire tension according to the present invention. 3 and 4 are explanatory views of the high-frequency resonance characteristic of the drive coil unit according to the present invention, FIG. 4 is a plan view of a conventional objective lens driving device, and FIG. 5 is a vertical cross-sectional view of the drive coil unit of the conventional device. FIG. 6 is a side view of a drive coil portion of a conventional device, FIG. 7 is an explanatory view of a high frequency resonance characteristic of a drive coil of the conventional device, and FIG. 8 is an explanatory view showing protrusion of the drive coil in the conventional device. In the figure, (1) is a lens holder, (2) is an objective lens, (3) is a shaft, (4) is a balancer, (5) is a drive coil, (6) is a yoke, (7) is a magnet,
(8) is the actuator base, (9) is the mounting part, (1
0) is a wire, (11) is an adhesive, and (12) is an adhesive reinforcing layer. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
て少なくとも上下に移動可能であり、外周に凹部を有す
るレンズホルダと、 このレンズホルダの凹部に一方の極が位置し、レンズホ
ルダ凹部の外に他方の極が位置するよう、アクチュエー
タベースに対して固定された磁気回路手段と、 磁気回路手段の極のうちレンズホルダ凹部内の極の回り
を取り巻くように巻かれ、自由辺が前記マグネット部材
の両極間に位置するようレンズホルダ凹部に対して固定
された駆動コイルと、 レンズホルダ凹部両端のレンズホルダ外周面に設けられ
た複数の取付部と、 レンズホルダ凹部両端の取付部の間に、駆動コイルの巻
き方向とほぼ等しい方向に沿って張りわたされ、駆動コ
イルの自由辺をレンズホルダ方向に押止するワイヤと、 ワイヤを駆動コイルの自由辺に固定する接着補強層とを
備える対物レンズ駆動装置。1. An objective lens, a lens holder that holds the objective lens, is movable at least up and down with respect to an actuator base, and has a recess on the outer periphery, and one pole is located in the recess of the lens holder. , The magnetic circuit means fixed to the actuator base so that the other pole is located outside the lens holder recess, and the magnetic circuit means is wound so as to surround the pole in the lens holder recess among the poles of the magnetic circuit means, A drive coil fixed to the lens holder recess so that the free side is located between both poles of the magnet member, a plurality of mounting parts provided on the lens holder outer peripheral surface at both ends of the lens holder recess, and It is stretched between the mounting parts along a direction that is almost equal to the winding direction of the drive coil, and stops the free side of the drive coil in the lens holder direction. An objective lens driving device comprising: a wire, a bonding reinforcing layer for securing the wire to the free side of the drive coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2178892A JPH0770081B2 (en) | 1990-07-06 | 1990-07-06 | Objective lens drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2178892A JPH0770081B2 (en) | 1990-07-06 | 1990-07-06 | Objective lens drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0467439A JPH0467439A (en) | 1992-03-03 |
| JPH0770081B2 true JPH0770081B2 (en) | 1995-07-31 |
Family
ID=16056521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2178892A Expired - Lifetime JPH0770081B2 (en) | 1990-07-06 | 1990-07-06 | Objective lens drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0770081B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6912182B2 (en) | 2001-08-22 | 2005-06-28 | Funai Electric Co., Ltd. | Actuator for an optical pickup apparatus and method of producing an actuator for an optical pickup apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06319294A (en) * | 1993-09-10 | 1994-11-15 | Nippon Parusumootaa Kk | Five-phase stepping motor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5144081U (en) * | 1974-09-30 | 1976-04-01 | ||
| JPS5219201A (en) * | 1975-08-05 | 1977-02-14 | Agency Of Ind Science & Technol | Method of binding armature coils |
-
1990
- 1990-07-06 JP JP2178892A patent/JPH0770081B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6912182B2 (en) | 2001-08-22 | 2005-06-28 | Funai Electric Co., Ltd. | Actuator for an optical pickup apparatus and method of producing an actuator for an optical pickup apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0467439A (en) | 1992-03-03 |
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