JPS62165739A - Optical system driver - Google Patents
Optical system driverInfo
- Publication number
- JPS62165739A JPS62165739A JP623986A JP623986A JPS62165739A JP S62165739 A JPS62165739 A JP S62165739A JP 623986 A JP623986 A JP 623986A JP 623986 A JP623986 A JP 623986A JP S62165739 A JPS62165739 A JP S62165739A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- objective lens
- support
- optical axis
- optical
- 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
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- 238000013016 damping Methods 0.000 claims abstract description 15
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- 238000010586 diagram Methods 0.000 description 2
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- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber 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〕
本発明は光学系駆動装置に係り、特に光デイスク装置等
の光学式情報記録再生装置に好適に利用でき、光学系を
光軸方向及び光軸に垂直方向に移動させる光学系駆動装
置に関する。Detailed Description of the Invention [Industrial Application Field] The present invention relates to an optical system driving device, and is particularly suitable for use in optical information recording and reproducing devices such as optical disk devices. This invention relates to an optical system drive device that moves an optical system in a direction perpendicular to an axis.
近年、情報化社会の発達に伴って、大量の情報を蓄積し
、所望の情報を短時間で記録あるいは再生することがで
きる光学式情報記録再生装置の研究及び開発がさかんに
行われている。In recent years, with the development of the information society, research and development of optical information recording and reproducing devices that can store a large amount of information and record or reproduce desired information in a short time have been actively conducted.
以下、光学式情報記録再生装置の例として光デイスク装
置について説明する。An optical disk device will be described below as an example of an optical information recording/reproducing device.
一般に光デイスク装置においては、情報記録媒体上に幅
１〜２μｍ、長さ１〜３μｍ程度の情報ビットが形成さ
れている。この情報ピントから情報を再生するには、ま
ず光ビームを対物レンズにより微小スポットに集光し、
情報ビ・ノドに照射する。このとき情報ビットの有無に
より、情報記録媒体からの反射光あるいは透過光が光学
的に変化する。この変化を光検出器で検出することによ
り、情報ビットに対応した再生信号を得ることができる
。Generally, in an optical disk device, information bits having a width of about 1 to 2 μm and a length of about 1 to 3 μm are formed on an information recording medium. To reproduce information from this information focus, first, a light beam is focused on a minute spot using an objective lens.
Irradiates information to the throat. At this time, the reflected light or transmitted light from the information recording medium optically changes depending on the presence or absence of information bits. By detecting this change with a photodetector, a reproduced signal corresponding to the information bit can be obtained.
このような光デイスク装置においては、情報記録媒体上
の情報ビア）列を微小スポ・ノドが常に正６′ｍに走査
されていることが、掻めて重要である。In such an optical disk device, it is extremely important that the minute spot/nod always scan the information via row on the information recording medium in a regular 6' direction.
そのために情報記録媒体の反り等に伴なう焦点ずれを補
正するオートフォーカス機能及び情報記録媒体の偏心等
に伴なう照射位置ずれを補正するオートトラッキング機
能が必要となる。For this purpose, an autofocus function that corrects a focus shift caused by warpage of the information recording medium and an autotracking function that corrects an irradiation position shift caused by eccentricity of the information recording medium are required.
このオートフォーカス機能及びオートトラッキング機能
を実現する方法として、対物レンズをばね状構造体で支
持し、電磁コイルと永久磁石とによる電磁力の効果を用
いた駆動方法があり、この駆動方法が光デイスク装置の
対物レンズ駆動装置にとられていた。As a method of realizing this autofocus function and autotracking function, there is a driving method that supports the objective lens with a spring-like structure and uses the effect of electromagnetic force from an electromagnetic coil and a permanent magnet. It was taken by the objective lens drive device of the device.
第５図は従来の対物レンズ駆動装置の斜視図である。FIG. 5 is a perspective view of a conventional objective lens driving device.
第５図に示すように、基台３７にはコの字型のヨーク３
８が固着されており、このヨーク３８の内側に永久磁石
３４及びヨーク３３が固着される。As shown in FIG. 5, the base 37 has a U-shaped yoke 3.
A permanent magnet 34 and a yoke 33 are fixed inside the yoke 38.
支持ばね２７，２８の一端はヨーク３日に、他端は断面
が略正方形をした中継板３５の基台３７に対する垂直面
に固着される。支持ばね２５，２６の一端は中継板３５
の基台３７に対する上下面に、他端は対物レンズ３９を
有する対物レンズ保持体２４に固着される。対物レンズ
３９はレーザー光を情報記録媒体面上に集光させるもの
である。前記支持ばね２５，２６の間にはコイル３２が
固着される。このコイル３２は前記ヨーク３３と非接触
で且つ、ヨーク３３を取り巻くように設けられる。対物
レンズ保持体２４の支持ばね２５，２６が固着された面
と反対の面にはコイル３ｏが固着される。基台３７に、
永久磁石２９が固着されたコの字型のヨーク３１が固着
され、前記コイル３０は永久磁石２９と相対し、ヨーク
３１の一方の立設部を取り巻くように設けられる。基台
３７の対物レンズ３９と対向する部分は貫通孔３６があ
けられている。One end of the support springs 27, 28 is fixed to the yoke 3, and the other end is fixed to a surface perpendicular to the base 37 of a relay plate 35 having a substantially square cross section. One end of the support springs 25 and 26 is connected to the relay plate 35.
The other end is fixed to the objective lens holder 24 having the objective lens 39 on the upper and lower surfaces relative to the base 37 . The objective lens 39 focuses the laser beam onto the surface of the information recording medium. A coil 32 is fixed between the support springs 25 and 26. This coil 32 is provided so as not to be in contact with the yoke 33 and to surround the yoke 33. A coil 3o is fixed to a surface of the objective lens holder 24 opposite to the surface to which the support springs 25 and 26 are fixed. On the base 37,
A U-shaped yoke 31 to which a permanent magnet 29 is fixed is fixed, and the coil 30 is provided so as to face the permanent magnet 29 and surround one of the upright portions of the yoke 31. A through hole 36 is formed in a portion of the base 37 facing the objective lens 39.
以上の構成の従来の対物レンズ駆動装置のトラッキング
制御は、永久磁石３４とヨーク３８とヨーク３３とで磁
気回路を構成し、永久磁石３４とヨー１３３との間で形
成される磁界とコイル３２に流す電流とで電磁力を発生
させ、対物レンズ保持体２４を基台３７と平行方向に移
動させることによって行われる。Tracking control of the conventional objective lens drive device with the above configuration is performed by configuring a magnetic circuit with the permanent magnet 34, the yoke 38, and the yoke 33. This is performed by generating an electromagnetic force with a flowing current and moving the objective lens holder 24 in a direction parallel to the base 37.
また、フォーカス制御は、永久磁石２９とヨーク３１と
で磁気回路を構成し、永久磁石２９とヨーク３１との間
で形成される磁界とコイル３０に流す電流とで電磁力を
発生させ、対物レンズ保持体２４を基台３７と垂直方向
に移動させることによって行われる。In addition, focus control is performed by configuring a magnetic circuit with a permanent magnet 29 and a yoke 31, and generating an electromagnetic force with a magnetic field formed between the permanent magnet 29 and the yoke 31 and a current flowing through the coil 30. This is done by moving the holder 24 in a direction perpendicular to the base 37.
対物レンズ保持体２４の中立点保持は支持ばね２５．２
６．２７．２８によって行われる。The neutral point of the objective lens holder 24 is maintained by a support spring 25.2.
6.27.28.
しかしながら、上記従来の対物レンズ駆動においては、
高周波領域でフォーカス制御及びトラッキング制御を行
う際に、対物レンズ保持体が板状の支持ばねで保持され
ているために、支持ばねに副共振が発生し、精度の良い
フォーカスサーボ及びトラッキングサーボができなくな
る問題点があった。However, in the conventional objective lens drive described above,
When performing focus control and tracking control in a high frequency range, since the objective lens holder is held by a plate-shaped support spring, sub-resonance occurs in the support spring, making it impossible to perform accurate focus servo and tracking servo. There was a problem that would go away.
上記の問題点は、光学系を保持した光学系保持体と、互
いに回動及び摺動可能な支持軸及び軸受を前記光学系の
光軸方向に２組並設して成り、前記光学系保持体を光軸
に垂直な方向に移動可能に支持する第１の支持手段と、
弾性部材及び制振部材から成り前記第１の支持手段に接
続されて前記光学系保持体を光軸方向に移動可能に支持
する第２の支持手段と、前記光学系保持体を光軸方向及
び光軸に垂直な方向に移動させる駆動手段とから成る本
発明の光学系駆動装置によって解決される。The above problem is solved by an optical system holder that holds an optical system, and two sets of support shafts and bearings that are mutually rotatable and slidable and arranged in parallel in the optical axis direction of the optical system. a first support means that supports the body movably in a direction perpendicular to the optical axis;
a second support means, which is made of an elastic member and a vibration damping member and is connected to the first support means and supports the optical system holder movably in the optical axis direction; This problem is solved by the optical system driving device of the present invention, which comprises a driving means for moving the optical system in a direction perpendicular to the optical axis.
本発明の光学系駆動装置は、上記の構成とすることによ
り、光学系保持体の光軸と垂直な方向については、バネ
性を有する支持手段の支持なしに移動させることにより
、光学系保持体の振動をなくすことができ、一方、光軸
方向は第２の支持手段の変形を伴なうがこの第２の支持
手段を制振部材と弾性部材とで構成することにより光学
系保持体の振動の減衰時間を短縮することができる。The optical system drive device of the present invention has the above-described configuration, and by moving the optical system holder in the direction perpendicular to the optical axis of the optical system holder without the support of the supporting means having spring properties, the optical system holder can be On the other hand, in the optical axis direction, the second support means is deformed, but by configuring the second support means with a damping member and an elastic member, the vibration of the optical system holder can be eliminated. The vibration damping time can be shortened.
以下、本発明の実施例を図面を用いて詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
なお、本発明の光学系駆動装置として、対物レンズ駆動
装置を例にとって説明を行うものとする。Note that an explanation will be given by taking an objective lens driving device as an example of the 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を示す
斜視図である。FIG. 1 is a perspective view showing an embodiment of the objective lens driving device of the present invention.
第１図に示すように、対物レンズ保持体２は、外周部に
コイル１８が巻回された円柱部材２０と、この円柱部材
２０の上部に設けられ、レーザー光を情報記録媒体上に
集光する対物レンズ１を有する柱状の対物レンズ保持部
材２２と、この対物レンズ保持部材２２の側面に設けら
れ、対物レンズ１の光軸方向（第１図図示のＹ方向、以
下Ｙ方向とする）と垂直な方向（第１図図示のＸ方向、
以下Ｘ方向とする）に２個の円筒形の軸受３，４を有す
る軸受保持部材２１からなる。Ｌ字形形状をなす基台１
９には円筒形状の永久磁石１７が固着されており、この
永久磁石１７の内周部と円柱部材２０に巻回されたフォ
ーカス用コイル１８とが対向するように、対物レンズ保
持体２が配置されている。As shown in FIG. 1, the objective lens holder 2 includes a cylindrical member 20 around which a coil 18 is wound, and is provided on the upper part of the cylindrical member 20 to focus a laser beam onto an information recording medium. A columnar objective lens holding member 22 having an objective lens 1 that is attached to the columnar objective lens holding member 22 is provided on the side surface of this objective lens holding member 22, and is provided in the optical axis direction of the objective lens 1 (the Y direction shown in FIG. 1, hereinafter referred to as the Y direction). Vertical direction (X direction shown in Figure 1,
It consists of a bearing holding member 21 having two cylindrical bearings 3 and 4 in the X direction (hereinafter referred to as the X direction). Base 1 having an L-shape
A cylindrical permanent magnet 17 is fixed to 9, and the objective lens holder 2 is arranged so that the inner peripheral part of this permanent magnet 17 and the focusing coil 18 wound around the cylindrical member 20 face each other. has been done.
軸受保持部材２１に保持された軸受３，４は内面が潤滑
性を有する様に加工が施こされ、互いに平行となるよう
に設けられる。軸受３，４には、回転可能かつ摺動可能
に支持軸５，６ （以下軸５゜６と記す）が嵌通される
。第２図は軸５の斜視図であり、軸５は軸受３と接触す
る部分５ａにテフロン系の樹脂がコーティーングされて
おり、これによって軸受３との軸摩擦の低減を図ってい
る。The bearings 3 and 4 held by the bearing holding member 21 are machined so that their inner surfaces have lubricating properties, and are arranged parallel to each other. Support shafts 5 and 6 (hereinafter referred to as shafts 5 and 6) are fitted into the bearings 3 and 4 so as to be rotatable and slidable. FIG. 2 is a perspective view of the shaft 5. The shaft 5 has a portion 5a that contacts the bearing 3 coated with Teflon resin, thereby reducing shaft friction with the bearing 3.
なお、軸６は軸５と同構造である。本実施例では第１の
支持手段は軸５．６と軸受３，４とから構成される。軸
５．６の端部にはガイド７．８及び９．１０が設けられ
、軸受保持部材２１のＸ方向の移動を規制している。各
ガイド７．８．９゜１０の外周上の一部には、基台１９
の立設部に一端が固着された第２の支持手段（以下、単
に支持手段と記す）１１．１２．１３．１４の他端が接
続されている。なおこの支持手段１１，１２．１３．１
４の詳細については後述する。Note that the shaft 6 has the same structure as the shaft 5. In this embodiment, the first support means consist of a shaft 5.6 and bearings 3, 4. Guides 7.8 and 9.10 are provided at the end of the shaft 5.6 to restrict movement of the bearing holding member 21 in the X direction. A part of the outer circumference of each guide 7.8.9゜10 has a base 19.
The other end of second support means (hereinafter simply referred to as support means) 11, 12, 13, and 14 is connected to the upright portion of the support means (hereinafter simply referred to as support means). Note that this support means 11, 12.13.1
The details of 4 will be described later.
軸受保持部材２１の対物レンズ保持部材２２が固着され
た面の反対面には略矩形状のコイル１６が固着されてい
る。このコイル１６に対向するように、永久磁石１５が
背板２３に固着され、この背板２３は基台１９に固着さ
れる。A substantially rectangular coil 16 is fixed to the surface of the bearing holding member 21 opposite to the surface to which the objective lens holding member 22 is fixed. A permanent magnet 15 is fixed to a back plate 23 so as to face this coil 16, and this back plate 23 is fixed to a base 19.
次に上記構成の対物レンズ駆動装置の動作について説明
する。Next, the operation of the objective lens drive device having the above configuration will be explained.
まず、トラッキング制御はコイル１６のＹ方向に流す電
流と永久磁石１５との電磁力によって、対物レンズ保持
体２を、軸受３，４を介して軸５゜６上でＸ方向に摺動
させることによって行われる。First, tracking control involves sliding the objective lens holder 2 in the X direction on the axis 5°6 via the bearings 3 and 4 using the current flowing in the Y direction of the coil 16 and the electromagnetic force of the permanent magnet 15. carried out by.
この時、軸受３，４と軸５，６との摩擦が少ないために
支持手段１１〜１４はほとんど変形しない。At this time, since there is little friction between the bearings 3, 4 and the shafts 5, 6, the supporting means 11-14 are hardly deformed.
すなわち、トラッキング駆動は支持手段１１〜１４にほ
とんど影響を及ぼさないために、高周波域において、不
用な副共振等の発生が抑えられ、精度の良いトラッキン
グサーボをかけることができる。That is, since the tracking drive has almost no effect on the supporting means 11 to 14, occurrence of unnecessary sub-resonance etc. is suppressed in the high frequency range, and highly accurate tracking servo can be applied.
また、フォーカス制御はコイル１８に流す電流と永久磁
石１７により発生する磁界との電磁力によってＹ方向に
対物レンズ保持体２を移動させることによって行われる
。この時対物レンズ保持体２は軸受３，４を介して軸５
，６上を、軸受３゜４の軸線を中心として回動しながら
、且つ支持手段１１〜１４の変形を伴いながら移動する
。その際対物レンズ保持体２は４本の支持手段１１〜１
４によって支持されているために、支持手段と対物レン
ズ保持体とが所謂平行リングを構成し、対物レンズ１の
光軸倒れは発生しない。Further, focus control is performed by moving the objective lens holder 2 in the Y direction using the electromagnetic force of the current flowing through the coil 18 and the magnetic field generated by the permanent magnet 17. At this time, the objective lens holder 2 is connected to the shaft 5 via bearings 3 and 4.
, 6, while rotating about the axis of the bearing 3.degree. 4, and with deformation of the supporting means 11-14. In this case, the objective lens holder 2 has four supporting means 11 to 1.
4, the support means and the objective lens holder form a so-called parallel ring, and the optical axis of the objective lens 1 does not tilt.
本発明の対物レンズ駆動装置においては支持手段１１〜
１４を、ワイヤー等の弾性部材とゴム等の制振部材とか
ら構成する。第３図は支持手段１１の斜視図であり、弾
性部材１１ａを軸として、その周囲に制振部材１１ｂを
形成する。In the objective lens driving device of the present invention, the supporting means 11 to
14 is composed of an elastic member such as a wire and a vibration damping member such as rubber. FIG. 3 is a perspective view of the support means 11, in which a damping member 11b is formed around the elastic member 11a as an axis.
第４図は支持手段１１の振動の減衰特性を示す図であり
、（ａｌは弾性部材１１ａのみの場合を示し、（ｂ）は
制振部材１１ｂを設けた場合を示す。FIG. 4 is a diagram showing the vibration damping characteristics of the support means 11, (al shows the case where only the elastic member 11a is provided, and (b) shows the case where the damping member 11b is provided.
第４図に示したように、支持手段１１の振動の減衰特性
は著しく改善される。すなわち支持部材１１ａの弾性力
によって生ずる振動は制振部材１１ａによって抑制され
振動は早く減衰する。なお、支持手段１２〜１４は支持
手段１１と同構造である。上記本発明の対物レンズ装置
の支持手段を用いることにより、高周波動作時における
対物レンズ１の光軸方向の副共振の発生が抑えられ、フ
ォーカスサーボを安定化させることができる。As shown in FIG. 4, the vibration damping properties of the support means 11 are significantly improved. That is, vibrations caused by the elastic force of the support member 11a are suppressed by the damping member 11a, and the vibrations are quickly damped. Note that the supporting means 12 to 14 have the same structure as the supporting means 11. By using the supporting means of the objective lens device of the present invention, the occurrence of sub-resonance in the optical axis direction of the objective lens 1 during high frequency operation can be suppressed, and focus servo can be stabilized.
制振部材としては、天然系ゴム、シリコーンゴム、クロ
ロブレン、スチレンゴム、ニトリルゴム等の合成ゴム等
の高分子材料が用いられる。また弾性部材の材料として
は弾性を有する鋼材等が適している。As the vibration damping member, polymeric materials such as natural rubber, silicone rubber, chloroprene, styrene rubber, synthetic rubber such as nitrile rubber, etc. are used. Further, as the material for the elastic member, steel having elasticity or the like is suitable.
本発明は以上の実施例に限らず種々の変形が可能である
。例えば、前述の装置において、軸を対物レンズ保持体
に、軸受を支持手段に固定してもかまわない。The present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above-described apparatus, the shaft may be fixed to the objective lens holder and the bearing may be fixed to the support means.
以上、詳細に説明したように、本発明の光学系駆ｖＪ装
置によれば、光学系保持体をバネ性を有する支持手段の
支持なしに軸受の長さ方向に移動させるので、光軸に垂
直な方向の光学系保持体の振動を抑えることができ、ま
た光軸方向に支持する支持手段を制振部材と弾性部材と
で構成することにより、光軸方向の光学系保持体の振動
の減衰時間を短縮することができるので、光学系保持体
の駆動時の副共振の発生を防ぎ、精度の良いトラッキン
グサーボ、及びフォーカスサーボが可能となる。As described above in detail, according to the optical system drive vJ device of the present invention, the optical system holder is moved in the longitudinal direction of the bearing without the support of the supporting means having spring properties, so that it is perpendicular to the optical axis. The vibration of the optical system holder in the direction of the optical axis can be suppressed, and the vibration of the optical system holder in the direction of the optical axis can be damped by configuring the support means that supports the optical system in the direction of the optical axis with a damping member and an elastic member. Since the time can be shortened, the occurrence of sub-resonance during driving of the optical system holder can be prevented, and highly accurate tracking servo and focus servo can be performed.
第１図は本発明の対物レンズ駆動装置の一実施例を示す
斜視図である。
第２図は上記実施例に用いられる軸の斜視図である。
第３図は上記実施例に用いられる支持手段の斜視図であ
る。
第４図は支持手段の振動減衰特性を示す図である。
第５図は従来の対物レンズ駆動装置の斜視図である。
１・一対物レンズ、２一対物レンズ保持体、３゜４・−
・軸受、５，６−・−軸、７． ８． ９． １０−ガ
イド、１１． １２． １３． １４−＝支持手段、Ｉ
ｌａ・・−弾性部材、１ ｌ ｂ−制振部材、１９−基
台。
代理人 弁理士 山 下 穣 平
第３図
第４図FIG. 1 is a perspective view showing an embodiment of the objective lens driving device of the present invention. FIG. 2 is a perspective view of the shaft used in the above embodiment. FIG. 3 is a perspective view of the support means used in the above embodiment. FIG. 4 is a diagram showing the vibration damping characteristics of the support means. FIG. 5 is a perspective view of a conventional objective lens driving device. 1.1 objective lens, 21 objective lens holder, 3゜4・-
・Bearing, 5, 6-...-axis, 7. 8. 9. 10-Guide, 11. 12. 13. 14-=supporting means, I
la...-elastic member, 1 l b-damping member, 19-base. Agent Patent Attorney Johei YamashitaFigure 3Figure 4
Claims (1)
可能な支持軸及び軸受を前記光学系の光軸方向に２組並
設して成り、前記光学系保持体を光軸に垂直な方向に移
動可能に支持する第１の支持手段と、弾性部材及び制振
部材から成り前記第１の支持手段に接続されて前記光学
系保持体を光軸方向に移動可能に支持する第２の支持手
段と、前記光学系保持体を光軸方向及び光軸に垂直な方
向に移動させる駆動手段とから成る光学系駆動装置。An optical system holder holding an optical system, and two sets of support shafts and bearings that can rotate and slide relative to each other are arranged in parallel in the optical axis direction of the optical system, and the optical system holder is held perpendicular to the optical axis. a first support means that supports the optical system holder movably in the direction of the optical axis; and a second support means that is connected to the first support means and is made of an elastic member and a vibration damping member and supports the optical system holder so as to be movable in the optical axis direction. An optical system driving device comprising: a supporting means; and a driving means for moving the optical system holder in an optical axis direction and in a direction perpendicular to the optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP623986A JPH0619842B2 (en) | 1986-01-17 | 1986-01-17 | Optical system drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP623986A JPH0619842B2 (en) | 1986-01-17 | 1986-01-17 | Optical system drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62165739A true JPS62165739A (en) | 1987-07-22 |
| JPH0619842B2 JPH0619842B2 (en) | 1994-03-16 |
Family
ID=11632953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP623986A Expired - Lifetime JPH0619842B2 (en) | 1986-01-17 | 1986-01-17 | Optical system drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619842B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5204567A (en) * | 1990-07-09 | 1993-04-20 | Asmo Co., Ltd. | Brushless motor with resilient shaft end-play absorber |
| US5311489A (en) * | 1989-10-13 | 1994-05-10 | Canon Kabushiki Kaisha | Optical head for recording, reproducing, or erasing information having fixed and movable head units |
-
1986
- 1986-01-17 JP JP623986A patent/JPH0619842B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311489A (en) * | 1989-10-13 | 1994-05-10 | Canon Kabushiki Kaisha | Optical head for recording, reproducing, or erasing information having fixed and movable head units |
| US5204567A (en) * | 1990-07-09 | 1993-04-20 | Asmo Co., Ltd. | Brushless motor with resilient shaft end-play absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0619842B2 (en) | 1994-03-16 |
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