JPH0746423B2 - Objective lens actuator - Google Patents
Objective lens actuatorInfo
- Publication number
- JPH0746423B2 JPH0746423B2 JP60005225A JP522585A JPH0746423B2 JP H0746423 B2 JPH0746423 B2 JP H0746423B2 JP 60005225 A JP60005225 A JP 60005225A JP 522585 A JP522585 A JP 522585A JP H0746423 B2 JPH0746423 B2 JP H0746423B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- optical axis
- contact
- lens cell
- movable body
- 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)
- Mounting And Adjusting Of Optical Elements (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
【発明の詳細な説明】 （技術分野） 本発明は対物レンズアクチュエータに関し、より詳細に
は光ディスク装置に適用しうる対物レンズアクチュエー
タに関するものである。TECHNICAL FIELD The present invention relates to an objective lens actuator, and more particularly to an objective lens actuator applicable to an optical disk device.
（従来技術） 従来、第４図に示す如き構成の対物レンズアクチュエー
タ及び光ピックアップの組立体たる光ピックアップ装置
がある。(Prior Art) Conventionally, there is an optical pickup device which is an assembly of an objective lens actuator and an optical pickup having a configuration as shown in FIG.
その概要を説明すると、光ピックアップ１に対し対物レ
ンズアクチュエータ２がボルト3,4で締付け固定されて
いる。対物レンズアクチュエータ２は略円筒状のハウジ
ング５内に組立てられている。即ち、ハウジング５の内
壁には環状の永久磁石MGを充填された断面略Ｃ字状のヨ
ーク６が固着されており、このヨーク６に生起する磁束
と鎖交する如く可動体としての円筒状ボビン（以下、単
にボビンという）７のコイルＣが位置している。To explain the outline, the objective lens actuator 2 is fixed to the optical pickup 1 with bolts 3 and 4. The objective lens actuator 2 is assembled in a substantially cylindrical housing 5. That is, a yoke 6 having a substantially C-shaped cross section filled with an annular permanent magnet MG is fixed to the inner wall of the housing 5, and a cylindrical bobbin serving as a movable body is interlinked with a magnetic flux generated in the yoke 6. A coil C of 7 (hereinafter, simply referred to as a bobbin) is located.
ボビン７はその中央部に形成された中空部7aの中心が光
ピックアップ１の光軸Ｌ−Ｌに合わせてその上・下端部
を各々上板ばね8,下板ばね９にてヨーク６に支持されて
おり、これら板ばねの撓みに応じて該光軸Ｌ−Ｌ方向に
進退移動できる。The bobbin 7 has a hollow portion 7a formed at the center thereof whose center is aligned with the optical axis L-L of the optical pickup 1 and its upper and lower ends are supported by the yoke 6 by an upper leaf spring 8 and a lower leaf spring 9, respectively. It is possible to move back and forth in the optical axis L-L direction according to the bending of these leaf springs.
さらに、このボビン７の上部円板状の面7bには光軸を中
心とする同心円上等間隔に３個所、支持円板11を貫通し
てボルトが螺合されており、面7bと支持円板11間には伸
張性のコイルばねSCが巻回されている。なお、繁雑を避
けるためこのボルトを１本だけ符号10で示し、他の２本
は省略してある。Further, on the upper disk-shaped surface 7b of the bobbin 7, bolts are screwed through the support disk 11 at three positions on a concentric circle centered on the optical axis at equal intervals. A stretchable coil spring SC is wound between the plates 11. In order to avoid complication, only one of these bolts is indicated by reference numeral 10 and the other two are omitted.
このコイルばねSCの働きにより、支持円板11は略水平状
に保持されている。支持円板11の中心部には、対物レン
ズを保持した対物レンズセル12が固定されており、従っ
てボルト10及び他の２個所のボルト（図示されず）の締
め加減を調節すれば光軸Ｌ−Ｌと対物レンズセル12の光
軸L1-L1の方向を合わせる等の調節をなし得る。つま
り、対物レンズセル12は角度調整自在である。By the action of this coil spring SC, the support disk 11 is held in a substantially horizontal shape. An objective lens cell 12 holding an objective lens is fixed to the center of the support disk 11, and therefore the optical axis L can be adjusted by adjusting the tightening of the bolt 10 and two other bolts (not shown). -L and the direction of the optical axis L 1 -L 1 of the objective lens cell 12 can be adjusted. That is, the objective lens cell 12 is adjustable in angle.
一方、前記ヨーク６とコイルＣとの組合せは駆動源とし
ての一種のリニアモータを構成し、コイルＣに対する電
流の印加状況に応じて板ばねを撓ませ、対物レンズセル
12をボビン７とともに光軸方向に駆動し、所謂フォーカ
シング制御を行なうことができる。On the other hand, the combination of the yoke 6 and the coil C constitutes a kind of linear motor as a driving source, and the leaf spring is bent in accordance with the current application state to the coil C, and the objective lens cell
By driving 12 together with the bobbin 7 in the optical axis direction, so-called focusing control can be performed.
このような構成において、加工精度誤差、組立誤差など
により、例えば第４図に示す如く光ピックアップの光軸
Ｌ−Ｌと対物レンズセル光軸L1-L1との平行はでている
ものの両光軸間にずれδ１が生じたり、或いは上記両光
軸の方向が平行でなかったりすることがある。In such a configuration, machining accuracy error, and the like assembly error, for example, the fourth those out parallel to the optical axis L-L and the objective lens cell optical axis L 1 -L 1 of the optical pickup as shown in FIG both A shift δ 1 may occur between the optical axes, or the directions of both optical axes may not be parallel.
上記前者の場合についてはボルト10などの締め加減を調
整しても光軸の方向がずれるだけでそれ以上修正のしよ
うがなく、上記後者の場合についてはボルト10などの締
め加減を調整することにより上記両光軸を平行にするこ
とはできるものの、対物レンズの主点が必ずしも光軸Ｌ
−Ｌ上にないため結局、第５図に示す如く上記両光軸間
にずれδ２を生じてしまうという問題がある。In the former case, even if the tightening or tightening of the bolt 10 etc. is adjusted, the direction of the optical axis will be misaligned and there will be no further correction.In the latter case, by adjusting the tightening or tightening of the bolt 10 etc. Although both optical axes can be made parallel, the principal point of the objective lens is not always the optical axis L.
Since it is not on -L, there is a problem that a deviation δ 2 is eventually generated between the both optical axes as shown in FIG.
このように対物レンズと光ピックアップの両光軸にずれ
があると、光強度分布にずれが生ずるので光ピックアッ
プ装置による情報の書き込み、読み取り性能に悪影響が
及ぶこととなる。When the optical axes of the objective lens and the optical pickup are deviated in this way, the light intensity distribution is deviated, which adversely affects the writing and reading performance of information by the optical pickup device.
（目的） したがって、この発明の目的は光ピックアップの光軸と
対物レンズの光軸とを容易に合致させることのできる対
物レンズアクチュエータを提供することにある。(Object) Therefore, it is an object of the present invention to provide an objective lens actuator which can easily match the optical axis of an optical pickup with the optical axis of an objective lens.
（構成） 本発明は上記の目的を達成させるため、対物レンズセル
にて保持した対物レンズを可動体と共に少なくとも光軸
方向に駆動する駆動源を備え、前記可動体に対して前記
対物レンズを角度調整自在とした対物レンズアクチュエ
ータであって、前記対物レンズアクチュエータと一体的
に組み立てられる光ピックアップの光軸上に対物レンズ
の主点を位置させ、前記可動体に凹部を形成して該凹部
に前記対物レンズセルの一端側全体を入り込ませ、か
つ、前記凹部内における前記可動体に対する前記対物レ
ンズセルの接触部が前記主点を中心として、前記凹部に
形成された球面状の面又はテーパ面を案内面として回動
されるように、前記接触部の接触状態を線接触又は前記
球面状の面との球面接触による面接触にするとともに適
宜の回動位置にて一体的に保持する保持手段を具備した
ことを特徴としたものである。(Structure) In order to achieve the above object, the present invention includes a drive source for driving an objective lens held by an objective lens cell together with a movable body in at least an optical axis direction, and the objective lens is angled with respect to the movable body. An adjustable objective lens actuator, wherein a principal point of the objective lens is located on an optical axis of an optical pickup integrally assembled with the objective lens actuator, a concave portion is formed in the movable body, and the concave portion is formed in the concave portion. The entire one end side of the objective lens cell is allowed to enter, and the contact portion of the objective lens cell with respect to the movable body in the concave portion has a spherical surface or a tapered surface formed in the concave portion with the principal point as the center. In order to rotate as a guide surface, the contact state of the contact portion is changed to a line contact or a surface contact by spherical contact with the spherical surface and an appropriate rotation position. It is characterized in that it is provided with a holding means for integrally holding it in a stationary position.
以下、本発明の一実施例に基づいて具体的に説明する。Hereinafter, a specific description will be given based on an embodiment of the present invention.
なお、以下の説明図では繁雑さを避けるため、混同のお
それのないものについては、第４図、第５図におけるも
のと同一の符号を用いていることを付記しておく。In addition, in order to avoid complexity in the following explanatory drawings, it should be noted that the same reference numerals as those in FIGS. 4 and 5 are used for those that are not confused.
第１図において、ボビン70の上部には対物レンズセル12
との接触部である球面13が形成されている。この球面13
の曲率中心Ｏは光ピックアップの光軸Ｌ−Ｌ上に位置す
るように設定されている。このように設定することは機
械加工並びに組立上比較的容易である。In FIG. 1, the objective lens cell 12 is provided above the bobbin 70.
A spherical surface 13 that is a contact portion with is formed. This sphere 13
The center of curvature O is set so as to be located on the optical axis L-L of the optical pickup. Setting in this way is relatively easy in terms of machining and assembly.
この球面13に対物レンズセル12の底部である円形の輪郭
部を全周、均等に接触させると、この対物レンズセル12
の中心に装着されている対物レンズの主点が曲率中心Ｏ
に一致する。これは、対物レンズセル12内における対物
レンズの取付精度を予め出しておけば比較的簡単に可能
である。When the circular contour which is the bottom of the objective lens cell 12 is evenly contacted with the spherical surface 13 all around, the objective lens cell 12
The principal point of the objective lens mounted at the center of the
Matches This is possible relatively easily if the mounting accuracy of the objective lens in the objective lens cell 12 is given in advance.
但し、対物レンズの光軸と光ピックアップの光軸Ｌ−Ｌ
との方向にずれを生じることは起こり得る。However, the optical axis of the objective lens and the optical axis of the optical pickup LL
It is possible that deviations occur in the directions of and.
このずれを修正するにはボルト10などの締め具合を調整
すればよい。ボルト10などの締め具合を調整すれば、対
物レンズセル12は球面13を案内面として揺動するもの
の、主点が光ピックアップの光軸上にありかつ、球面13
の曲率中心Ｏと一致しているので両光軸の方向ずれを修
正しても従来技術の如く両光軸の間隔にずれを生ずるよ
うなことはない。To correct this deviation, adjust the tightening of the bolt 10 and the like. Although the objective lens cell 12 oscillates with the spherical surface 13 as a guide surface if the tightening degree of the bolt 10 or the like is adjusted, the principal point is on the optical axis of the optical pickup and the spherical surface 13
Since it coincides with the center O of curvature, even if the direction deviation of both optical axes is corrected, there is no deviation in the distance between both optical axes as in the prior art.
調整作業が終了した場合、ボルト10などの締め加減はそ
の調整終了状態のまま保持される。従って、コイルばね
SCやボルト10などは対物レンズセル12を適宜の回動位置
に保持する固定手段としての一例として機能している。When the adjustment work is completed, the tightening or tightening of the bolt 10 or the like is maintained in the adjustment completed state. Therefore, the coil spring
The SC, the bolt 10, and the like function as an example of a fixing unit that holds the objective lens cell 12 at an appropriate rotation position.
上記の如き効果は、対物レンズセルの下端を凸状の球面
とし、ボビンの上端を凹状テーパ面として組合わせても
得ることができる。The above effects can also be obtained by combining the lower end of the objective lens cell with a convex spherical surface and the upper end of the bobbin with a concave tapered surface.
第２図はその一例を示したもので、対物レンズセル120
の下端には凸状の球面130が、又、これと接触すべきボ
ビン700の上端には凹状のテーパ面140が形成されてい
る。FIG. 2 shows an example of the objective lens cell 120.
A convex spherical surface 130 is formed on the lower end of the bobbin 700, and a concave tapered surface 140 is formed on the upper end of the bobbin 700 to be in contact therewith.
球面130の曲率中心Ｏは対物レンズセル120の主点に合致
し、かつ、光ピックアップの光軸が上記主点を通るよう
に設定されていることは勿論である。上記のほか、対物
レンズセルと、ボビンの対物レンズセル接触部との両方
が対物レンズセルの主点を中心とした凹凸の球面で係合
するように構成することもできる。It goes without saying that the center of curvature O of the spherical surface 130 is set so as to match the principal point of the objective lens cell 120 and the optical axis of the optical pickup passes through the principal point. In addition to the above, both the objective lens cell and the objective lens cell contact portion of the bobbin can be configured to engage with each other by a spherical surface having an unevenness centered on the principal point of the objective lens cell.
この例では、対物レンズセル120を適宜の回動位置に固
定する手段として、不動部材14に螺入されていて先端が
球面130の直上縁部を３点で押圧するように設定された
ボルト10′,10″（他の一本は図示を省略してある）が
用いられている。In this example, as a means for fixing the objective lens cell 120 at an appropriate rotation position, a bolt 10 that is screwed into the immovable member 14 and whose tip is set to press the edge immediately above the spherical surface 130 at three points. ′, 10 ″ (the other one is not shown) is used.
なお、固定手段としては上記例に限らず、第３図に示す
如き例もある。つまり、対物レンズセル120をボビン700
に板ばね15で支持し、この板ばね15を撓ませて球面130
をテーパ面140に押しあてつつ対物レンズセル120の適宜
の回動位置を定め、その位置における上記球面とテーパ
面との接触部位を接着剤（例えばエポキシ樹脂など）で
固定するのである。The fixing means is not limited to the above example, but may be an example as shown in FIG. That is, the objective lens cell 120 is replaced with the bobbin 700.
It is supported by a leaf spring 15 on the
While pressing the taper surface 140, the appropriate rotation position of the objective lens cell 120 is determined, and the contact portion between the spherical surface and the taper surface at that position is fixed with an adhesive (for example, epoxy resin).
第２図の実施例では、上記の如く接着の後、ボルト1
0′,10″や不動部材を取り外してもよく、重量を軽減で
きる効果がある。In the embodiment shown in FIG. 2, the bolt 1 is attached after bonding as described above.
It is possible to remove 0 ', 10 "and the immovable member, which has the effect of reducing the weight.
（効果） 本発明では対物レンズセル下端とボビン上端とを均等圧
で係合すれば自動的に光ピックアップの光軸上に対物レ
ンズ主点が位置することになり、かつ、光ピックアップ
光軸と対物レンズ光軸とを球面を案内にして容易に一致
させることができる。(Effect) In the present invention, if the lower end of the objective lens cell and the upper end of the bobbin are engaged with each other with equal pressure, the objective lens principal point is automatically positioned on the optical axis of the optical pickup, and The optical axis of the objective lens can be easily matched with the spherical surface as a guide.
第１図乃至第３図は各々、本発明の一実施例である対物
レンズアクチュエータの要部断面図、第４図は従来技術
に係る光ピックアップ装置の要部断面図、第５図は同上
図における対物レンズセルの調整態様を説明した部分断
面図である。 10,10′、10″……ボルト、12,120……対物レンズセ
ル、13,130……球面、Ｏ……曲率中心、Ｌ−Ｌ……光ピ
ックアップの光軸、SC……コイルばね。1 to 3 are cross-sectional views of an essential part of an objective lens actuator according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of an essential part of an optical pickup device according to a conventional technique, and FIG. 4 is a partial cross-sectional view illustrating an adjustment mode of the objective lens cell in FIG. 10, 10 ', 10 "... bolt, 12, 120 ... objective lens cell, 13, 130 ... spherical surface, O ... center of curvature, LL ... optical axis of optical pickup, SC ... coil spring.
Claims (1)
可動体と共に少なくとも光軸方向に駆動する駆動源を備
え、前記可動体に対して前記対物レンズを角度調整自在
とした対物レンズアクチュエータであって、 前記対物レンズアクチュエータと一体的に組み立てられ
る光ピックアップの光軸上に対物レンズの主点を位置さ
せ、前記可動体に凹部を形成して該凹部に前記対物レン
ズセルの一端側全体を入り込ませ、かつ、前記凹部内に
おける前記可動体に対する前記対物レンズセルの接触部
が前記主点を中心として、前記凹部に形成された球面状
の面又はテーパ面を案内面として回動されるように、前
記接触部の接触状態を線接触又は前記球面状の面との球
面接触による面接触にするとともに適宜の回動位置にて
一体的に保持する保持手段を具備したことを特徴とする
対物レンズアクチュエータ。1. An objective lens actuator, comprising a drive source for driving an objective lens held by an objective lens cell together with a movable body in at least an optical axis direction, the angle of the objective lens being adjustable with respect to the movable body. Then, the principal point of the objective lens is positioned on the optical axis of the optical pickup that is integrally assembled with the objective lens actuator, a concave portion is formed in the movable body, and the entire one end side of the objective lens cell is inserted into the concave portion. And the contact portion of the objective lens cell with respect to the movable body in the concave portion is rotated about the principal point with a spherical surface or a tapered surface formed in the concave portion as a guide surface. Holding means for making the contact state of the contact portion linear contact or surface contact by spherical contact with the spherical surface and integrally holding at a proper rotation position. An objective lens actuator, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60005225A JPH0746423B2 (en) | 1985-01-16 | 1985-01-16 | Objective lens actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60005225A JPH0746423B2 (en) | 1985-01-16 | 1985-01-16 | Objective lens actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61165832A JPS61165832A (en) | 1986-07-26 |
| JPH0746423B2 true JPH0746423B2 (en) | 1995-05-17 |
Family
ID=11605246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60005225A Expired - Lifetime JPH0746423B2 (en) | 1985-01-16 | 1985-01-16 | Objective lens actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0746423B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59223954A (en) * | 1983-06-03 | 1984-12-15 | Matsushita Electric Ind Co Ltd | light pick up |
-
1985
- 1985-01-16 JP JP60005225A patent/JPH0746423B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61165832A (en) | 1986-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |