JPH0490506A - Rotary mirror device for tracking - Google Patents
Rotary mirror device for trackingInfo
- Publication number
- JPH0490506A JPH0490506A JP20602990A JP20602990A JPH0490506A JP H0490506 A JPH0490506 A JP H0490506A JP 20602990 A JP20602990 A JP 20602990A JP 20602990 A JP20602990 A JP 20602990A JP H0490506 A JPH0490506 A JP H0490506A
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- tracking
- reflecting mirror
- thin plate
- plate spring
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000000452 restraining effect Effects 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は5例λば光デイスク装置の光学ヘッドにおいて
、光ビームスポットを光ディスクのトラックに追従させ
るために用いられるトラッキング用回動ミラー装置に関
するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a rotating mirror device for tracking used in an optical head of an optical disk device, for example, for making a light beam spot follow a track of an optical disk. It is something.
[従来の技術]
従来、この種のトラッキング用回動ミラー装置には、反
射ミラーを回動可能に保持するため、シリコン等のゴム
部材の一端をミラー保持部材上に接着焼付けて支持部材
としたものが知られている。また、第8図、第9図に示
すように、反射ミラー1を保持するミラー保持部材2を
薄板ばね3又はワイヤで支持することにより、反射ミラ
ー1を駆動コイル4により駆動し、かつミラー保持部材
2の回動中心を規定するための剛体から成るピボット軸
5を設けた方式のものが提案されている。[Prior Art] Conventionally, in this type of rotating mirror device for tracking, in order to rotatably hold the reflecting mirror, one end of a rubber member such as silicone is bonded and baked onto the mirror holding member to serve as a supporting member. something is known. Further, as shown in FIGS. 8 and 9, by supporting the mirror holding member 2 that holds the reflecting mirror 1 with a thin plate spring 3 or a wire, the reflecting mirror 1 can be driven by the drive coil 4 and the mirror can be held. A system has been proposed in which a pivot shaft 5 made of a rigid body is provided to define the center of rotation of the member 2.
[発明が解決しようとする課題]
前述の従来例のうち、前者のゴム部材を支持部材とする
方式はゴム部材特有の永久変形を伴うヒステリシスによ
り、回動角が駆動コイルに流す電流に対し非線形性を有
すること、及びゴム部材のロット間における機械的特性
のばらつきがあること等に原因して制御が複雑になり、
かつ中立位置及び回動中心を規定し難い等の問題を有し
ている。また、後者のピボット軸5を用いる方式のもの
は、反射ミラーlの回動中心を一方向に押し出す張力及
び非結合力による摩擦力が発生するので、その共振周波
数を高め周波数特性を乱してしまう等の欠点を有してい
る。[Problems to be Solved by the Invention] Among the conventional examples described above, in the former method in which a rubber member is used as a support member, the rotation angle is non-linear with respect to the current flowing through the drive coil due to hysteresis accompanied by permanent deformation peculiar to the rubber member. Control becomes complicated due to the characteristics of rubber parts and variations in mechanical properties between lots of rubber parts.
Further, there are problems such as difficulty in defining the neutral position and center of rotation. In addition, the latter method using the pivot shaft 5 generates frictional force due to tension and uncoupling force that push the center of rotation of the reflecting mirror l in one direction, which increases the resonance frequency and disturbs the frequency characteristics. It has drawbacks such as being easily stowed away.
本発明の目的は、ミラー保持部材を支持する薄板ばねに
張力を掛けずに反射ミラーの並進運動を規制できるよう
にして、反射ミラーの回動姿勢をより確実なものとし、
かつミラー保持部材に起因する共振周波数を低(抑えて
トラッキングの周波数帯域を拡大し、データの記録再生
を高速で行えるようにしたトラッキング用回動ミラ〜装
置を提供することにある。An object of the present invention is to make it possible to regulate the translational movement of a reflecting mirror without applying tension to the thin plate spring that supports the mirror holding member, thereby making the rotating posture of the reflecting mirror more reliable;
Another object of the present invention is to provide a rotating mirror device for tracking that can reduce the resonance frequency caused by the mirror holding member, expand the tracking frequency band, and perform data recording and reproduction at high speed.
[課題を解決するための手段]
上述の目的を達成するために、本発明に係るトラッキン
グ用回動ミラー装置においては、光ビームスポットを情
報記録媒体の光ディスクの半径方向に駆動させるトラッ
キング用回動ミラー装置であって、反射ミラーを保持す
るミラー保持部材を薄板ばねにより回動自在に支持し、
前記薄板ばねの平面部を前記反射ミラーの反射面に重ね
合わせるようにし、前記薄板ばねを前記平面部と薄板ば
ね支持部材への取付部との間で(びれさせて前記回動の
ための捩り部を形成し、前記薄板ばねの平面部に背面か
ら当接し、前記反射ミラーの回動方向に対しては剛性が
小さな弾性部材を設けたことを特徴とするものである。[Means for Solving the Problems] In order to achieve the above-mentioned object, a tracking rotating mirror device according to the present invention includes a tracking rotating mirror device that drives a light beam spot in the radial direction of an optical disk of an information recording medium. A mirror device in which a mirror holding member for holding a reflecting mirror is rotatably supported by a thin plate spring,
The flat part of the thin plate spring is overlapped with the reflective surface of the reflective mirror, and the thin plate spring is bent between the flat part and the attachment part to the thin plate spring support member to prevent twisting for the rotation. The present invention is characterized in that an elastic member is provided, which forms a portion, contacts the flat portion of the thin plate spring from the back side, and has low rigidity with respect to the rotating direction of the reflecting mirror.
[作用コ
上述の構成を有するトラッキング用回動ミラー装置は、
所望の回動方向の剛性を小さくした形状の弾性部材が、
反射ミラーの回動中心を規定すると共に、薄板ばねに張
力を掛けることなく反射ミラーの並進運動を規制する。[Operations] The rotating mirror device for tracking having the above-mentioned configuration is
The elastic member has a shape with reduced rigidity in the desired direction of rotation,
To define the center of rotation of a reflecting mirror and to regulate the translational movement of the reflecting mirror without applying tension to a thin plate spring.
[実施例]
本発明を第1図〜第7図に図示の実施例に基づいて詳細
に説明する。[Example] The present invention will be described in detail based on the example illustrated in FIGS. 1 to 7.
第1図は薄板ばねによって反射ミラーを懸架した型式の
トラッキング用回動ミラー装置に適用した実施例の側面
図、第2図はその斜視図である。FIG. 1 is a side view of an embodiment applied to a rotating mirror device for tracking in which a reflecting mirror is suspended by a thin plate spring, and FIG. 2 is a perspective view thereof.
反射ミラーIOはその反射面の背面をミラー保持部材1
1に張り付けることにより保持され、ミラー保持部材1
1は薄板ばね12により懸架して保持されている。ミラ
ー保持部材11の側面の廻りには駆動コイル13が巻回
され、コイル13を挟み込むようにしてその両側にヨー
ク14、中継ヨーク15が設けられており、ヨークI4
.15間に永久磁石16が介在されている。薄板ばね1
2は第3図に示すように、ミラー保持部材11への取付
部12a、薄板ばね12を支持するための2個の取付部
12b、及び反射ミラー10を回動するための2個の捩
り部12cから成り、この捩り部12cは取付部12a
と取付部12bとの間をくびれさせて架橋状態とし、捩
り部12cの幅及び薄板ばね12の板厚を変えることに
よって捩り剛性を変化させ、−次の捩り共振周波数を変
化させることが可能とされている。反射ミラー10の回
動はヨーク14、中継ヨーク15、磁石16で構成され
る磁気回路と駆動コイル13による駆動によって行われ
、薄板ばねI2の2つの捩り部12cが回動中心となる
。The reflective mirror IO has a mirror holding member 1 on the back side of its reflective surface.
The mirror holding member 1 is held by sticking it to the mirror holding member 1.
1 is suspended and held by a thin plate spring 12. A drive coil 13 is wound around the side surface of the mirror holding member 11, and a yoke 14 and a relay yoke 15 are provided on both sides of the coil 13 so as to sandwich the coil 13.
.. A permanent magnet 16 is interposed between the magnets 15 and 15 . Thin spring 1
2, as shown in FIG. 3, a mounting portion 12a for attaching to the mirror holding member 11, two mounting portions 12b for supporting the thin plate spring 12, and two torsion portions for rotating the reflecting mirror 10. 12c, and this twisted part 12c is the mounting part 12a.
and the attachment part 12b to create a bridged state, and by changing the width of the torsion part 12c and the thickness of the thin plate spring 12, it is possible to change the torsional rigidity and change the next torsional resonance frequency. has been done. The reflection mirror 10 is rotated by a magnetic circuit including a yoke 14, a relay yoke 15, and a magnet 16, and driven by a drive coil 13, and the two torsion portions 12c of the thin plate spring I2 serve as centers of rotation.
反射ミラー10の回動中心を規定し、並進運動を規制す
る手段として、ミラー保持部材11のミラー取付部の背
面つまり薄板ばね13の取付部12aの背面に、POM
やナイロン等の合成樹脂材料等で造られ、先端を第4図
に示すようなピボット部材17が第5図に示すように接
合されている。このピボット部材17は先端部を平面部
17aとし、回動中心となる部分をヒンジ部17bとし
、このヒンジ部17bにかなりの幅を持たせて、反射ミ
ラー10の回動方向の剛性を極く小さくした弾性部材と
されている。As a means for defining the center of rotation of the reflecting mirror 10 and regulating the translational movement, a POM is installed on the back surface of the mirror mounting portion of the mirror holding member 11, that is, on the back surface of the mounting portion 12a of the thin plate spring 13.
The pivot member 17 shown in FIG. 4 is connected to the tip of the pivot member 17 as shown in FIG. 5. This pivot member 17 has a flat part 17a at its tip and a hinge part 17b at the center of rotation.The hinge part 17b is given a considerable width to maximize the rigidity of the reflecting mirror 10 in the direction of rotation. It is a small elastic member.
例えば、駆動コイル13に電流が流れると、第1図にお
いて反射ミラー10の反射面に直交する方向に力が発生
するが、この力は駆動コイル13が薄板ばね12により
ミラー保持部材11を介して拘束されているので、薄板
ばね12の捩り部12cを中心とするモーメント力に変
換され、反射ミラー10はねじり部12cを中心に回動
する。反射ミラー1oの回動中心がピボット部材17に
より規定されると共に、反射ミラー10の反射面と直交
する方向に生ずる力による反射ミラーlOの並進運動を
、薄板ばね12に張力を掛けることなく規制することが
できる。For example, when a current flows through the drive coil 13, a force is generated in a direction perpendicular to the reflective surface of the reflection mirror 10 in FIG. Since it is restrained, it is converted into a moment force centered on the torsion portion 12c of the thin plate spring 12, and the reflecting mirror 10 rotates around the torsion portion 12c. The center of rotation of the reflective mirror 1o is defined by the pivot member 17, and the translational movement of the reflective mirror 10 due to a force generated in a direction perpendicular to the reflective surface of the reflective mirror 10 is regulated without applying tension to the thin plate spring 12. be able to.
以上は、形状効果を用いて所望の回動方向の剛性を小さ
くした例であるが、これを第6図、第7図に示すように
、薄板ばね12を弾性部材18を介在して棒状のピボッ
ト軸19により支持することによって同様な効果を得る
ことができる。ここでは、ピボット軸19を薄板ばね1
2の取付部12aに接着した例えば室温加硫型のシリコ
ンゴム等の弾性部材18により、ミラー保持部材11又
は薄板ばね12に張力を掛けることなく、反射ミラー1
0の並進運動を規制するようにしている。なお、この場
合のピボット軸19の先端は球状になっているが、反射
ミラー10の回動中心の規定をより確実にするため、ナ
イフェツジ状にしてもよい。The above is an example in which the rigidity in the desired direction of rotation is reduced using the shape effect, and as shown in FIGS. A similar effect can be obtained by supporting the pivot shaft 19. Here, the pivot shaft 19 is connected to the thin plate spring 1.
An elastic member 18 made of room temperature vulcanizable silicone rubber or the like is bonded to the mounting portion 12a of the mirror 1 without applying tension to the mirror holding member 11 or the thin plate spring 12.
The translational movement of 0 is regulated. Although the tip of the pivot shaft 19 in this case is spherical, it may be shaped like a knife in order to more reliably define the center of rotation of the reflecting mirror 10.
[発明の効果]
以上説明したように本発明に係るトラッキング用回動ミ
ラー装置は、反射ミラーの回動姿勢をより確実なものと
し、かつ反射ミラー支持部材に起因する捩り共振周波数
を低く抑圧できるため、トラッキングの周波数帯域が拡
大し、その結果データの記録・再生の高速化が可能にな
る。[Effects of the Invention] As explained above, the rotating mirror device for tracking according to the present invention can make the rotating posture of the reflecting mirror more reliable, and suppress the torsional resonance frequency caused by the reflecting mirror support member to a low level. Therefore, the tracking frequency band is expanded, and as a result, it becomes possible to speed up data recording and reproduction.
図面第1図〜第7図は本発明に係るトラッキング用回動
ミラー装置の実施例を示し、第1図は側面図、第2図は
斜視図、第3図は薄板ばねの平面図、第4図はピボット
部材の斜視図、第5図は一部を切欠した斜視図、第6図
は第2の実施例の薄板ばねの正面図、第7図は一部を切
欠した斜視図であり、第8図は従来例の斜視図、第9図
はその一部を切欠した平面図である。
符号10は反射ミラー、11はミラー保持部材、12は
薄板ばね、13は駆動コイル、14はヨーク、15は中
継ヨーク、16は磁石、17はピボット部材、18は弾
性部材、19はピボット軸である。1 to 7 show an embodiment of the rotating mirror device for tracking according to the present invention, in which FIG. 1 is a side view, FIG. 2 is a perspective view, FIG. 3 is a plan view of a thin plate spring, and FIG. 4 is a perspective view of the pivot member, FIG. 5 is a partially cutaway perspective view, FIG. 6 is a front view of the thin plate spring of the second embodiment, and FIG. 7 is a partially cutaway perspective view. , FIG. 8 is a perspective view of the conventional example, and FIG. 9 is a partially cutaway plan view thereof. 10 is a reflecting mirror, 11 is a mirror holding member, 12 is a thin plate spring, 13 is a drive coil, 14 is a yoke, 15 is a relay yoke, 16 is a magnet, 17 is a pivot member, 18 is an elastic member, and 19 is a pivot shaft. be.
Claims (1)
径方向に駆動させるトラッキング用回動ミラー装置であ
って、反射ミラーを保持するミラー保持部材を薄板ばね
により回動自在に支持し、前記薄板ばねの平面部を前記
反射ミラーの反射面に重ね合わせるようにし、前記薄板
ばねを前記平面部と薄板ばね支持部材への取付部との間
でくびれさせて前記回動のための捩り部を形成し、前記
薄板ばねの平面部に背面から当接し、前記反射ミラーの
回動方向に対しては剛性が小さな弾性部材を設けたこと
を特徴とするトラッキング用回動ミラー装置。1. A rotating mirror device for tracking that drives a light beam spot in the radial direction of an optical disk of an information recording medium, in which a mirror holding member that holds a reflecting mirror is rotatably supported by a thin plate spring, and a flat portion is superimposed on the reflective surface of the reflective mirror, and the thin plate spring is constricted between the flat portion and an attachment portion to the thin plate spring support member to form a torsion portion for the rotation; A rotating mirror device for tracking, characterized in that an elastic member is provided which abuts the plane portion of the thin plate spring from the back side and has small rigidity with respect to the rotating direction of the reflecting mirror.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2206029A JP2988979B2 (en) | 1990-08-03 | 1990-08-03 | Rotating mirror device for tracking |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2206029A JP2988979B2 (en) | 1990-08-03 | 1990-08-03 | Rotating mirror device for tracking |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0490506A true JPH0490506A (en) | 1992-03-24 |
JP2988979B2 JP2988979B2 (en) | 1999-12-13 |
Family
ID=16516720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2206029A Expired - Fee Related JP2988979B2 (en) | 1990-08-03 | 1990-08-03 | Rotating mirror device for tracking |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2988979B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003046639A1 (en) * | 2001-11-27 | 2003-06-05 | Olympus Corporation | Light deflecting device |
-
1990
- 1990-08-03 JP JP2206029A patent/JP2988979B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003046639A1 (en) * | 2001-11-27 | 2003-06-05 | Olympus Corporation | Light deflecting device |
EP1369733A1 (en) * | 2001-11-27 | 2003-12-10 | Olympus Optical Co., Ltd. | Light deflecting device |
EP1369733A4 (en) * | 2001-11-27 | 2007-04-25 | Olympus Corp | Light deflecting device |
US7286273B2 (en) | 2001-11-27 | 2007-10-23 | Olympus Optical Co., Ltd. | Light deflecting device |
Also Published As
Publication number | Publication date |
---|---|
JP2988979B2 (en) | 1999-12-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |