JPS6187227A - Objective actuator for optical head - Google Patents
Objective actuator for optical headInfo
- Publication number
- JPS6187227A JPS6187227A JP20891484A JP20891484A JPS6187227A JP S6187227 A JPS6187227 A JP S6187227A JP 20891484 A JP20891484 A JP 20891484A JP 20891484 A JP20891484 A JP 20891484A JP S6187227 A JPS6187227 A JP S6187227A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- movable part
- coil
- focusing coil
- actuator
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
- H02K41/0352—Unipolar motors
- H02K41/0354—Lorentz force motors, e.g. voice coil motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/18—Machines moving with multiple degrees of freedom
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光メモリ装置に於ける光学ヘッドに関する。は
らに詳しくは光学へ９ドの先端部である対物レンズアク
チェエータの駆動機構に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical head in an optical memory device. More specifically, the present invention relates to a drive mechanism for an objective lens actuator, which is the tip of an optical lens.
第２図、第３図は従来の光学へラド対物レンズアクチュ
エータの例である。１は軸、２は磁気ヨークでこれに軸
１が固定されている。このヨーク２には軸１を中心にし
て環状の筒状部３が形成されている。４は磁石でありヨ
ーク２の外周に配置はれている。５も環状のヨークであ
り磁石４上に設けられている。非磁性材よりなるボビン
６は、軸１に対して摺動でき、かつ、これを中心に回動
できるよう嵌合でれている。又、このボビン６の外周面
にはフォーカシングコイル７、及びトラッキングコイル
８が夫々形成されている。フォーカシングコイル７は通
常のスピーカーコイルのようにボビン乙に対して軸１を
中心に巻装してあり、トラッキングコイル８は第３図に
示すように枠型に巻装されており、これがフォーカシン
グコイル７上に、これと機械的に一体となってボビン６
上に取付けられている。尚、このコイル８は４箇所に取
付けてあり、夫々の枠型コイル８において、軸１の延長
方向に沿へ方向に延在するコイル部分のうちいずれか一
方が有効部分となり、仙方は無効部分となるよろにヨー
ク５の一部を切欠５αしである。５α、６ａは光ビーム
の一過光、９は対物レンズである。FIGS. 2 and 3 are examples of conventional optical herad objective lens actuators. 1 is a shaft, and 2 is a magnetic yoke to which the shaft 1 is fixed. This yoke 2 has an annular cylindrical portion 3 formed around the shaft 1 . A magnet 4 is arranged around the outer periphery of the yoke 2. 5 is also an annular yoke and is provided on the magnet 4. A bobbin 6 made of a non-magnetic material is fitted so that it can slide on the shaft 1 and rotate about it. Further, a focusing coil 7 and a tracking coil 8 are formed on the outer peripheral surface of the bobbin 6, respectively. The focusing coil 7 is wound around the shaft 1 around the bobbin A like a normal speaker coil, and the tracking coil 8 is wound in a frame shape as shown in Fig. 3, and this is the focusing coil. 7, and mechanically integrated with this bobbin 6.
installed on top. This coil 8 is attached at four locations, and in each frame-shaped coil 8, one of the coil portions extending in the direction of extension of the shaft 1 is an effective portion, and the sac side is an invalid portion. A part of the yoke 5 is cut out 5α so that it becomes a part. Reference numerals 5α and 6a represent the passing light of the light beam, and reference numeral 9 represents an objective lens.
このような構成によれば磁石４により第２図に示すよう
に磁気回路φが構成される。従って、今フォーカシング
コイル７に電流を通ずることにより、この電流方向に応
じてコイルボビン６は上方。According to this configuration, the magnet 4 constitutes a magnetic circuit φ as shown in FIG. Therefore, by passing current through the focusing coil 7, the coil bobbin 6 moves upward according to the direction of the current.
又は下方に移動し、その量は電流量によりきまる。Or it moves downward, the amount of which is determined by the amount of current.
即ち、対物レンズ９を通じたレーザ光のディスクに対す
るフォーカシングが行なわれる。次にトラッキングコイ
ル８に電流を供給する時には、このトラッキングコイル
８の軸１に沿）方向だ延在するコイル部分（有効コイル
部分）に流れる電流に基づいて、このボビン６が軸１を
中心として回動じよちとする力が生ずる。即ち、これに
よりトラ−７キングがなこれる。That is, the laser beam is focused onto the disk through the objective lens 9. Next, when current is supplied to the tracking coil 8, based on the current flowing through the coil portion (effective coil portion) extending in the direction (along the axis 1) of the tracking coil 8, the bobbin 6 is rotated around the axis 1. A force that causes rotation and wobbling is generated. That is, this will result in tracking of 7.
このような構成による対物レンズアクチュエータでは対
物レンズがアクチェエータの中心に設けられた軸を中心
として回転するため、アクチュエータ全体の直径が大き
くなり光ヘッドの不型化には不適である。そこで本発明
ではこのような問題点を解決し、対物レンズアクチュエ
ータの小型薄形化を計り、しいては光ヘッド全体の小型
薄形化を可能とするものである。In an objective lens actuator having such a configuration, the objective lens rotates around an axis provided at the center of the actuator, which increases the diameter of the entire actuator, making it unsuitable for making the optical head compact. Therefore, the present invention solves these problems and makes it possible to make the objective lens actuator smaller and thinner, thereby making it possible to make the entire optical head smaller and thinner.
本発明による対物レンズアクチュエータは対物レンズを
光軸（フォーカス）方向に移動する第１の可動部、及び
ディスクの半径方向（トラフそング）に移動する第２の
可動部、さらには、前記第１、第２の可動部を駆動する
磁気回路からなり、前記第１の可動部に中央に対物レン
ズ、その周辺にＨ長方形のフォーカスコイル、該フォー
カスコイル上には４個のトラッキングコイルを一体で形
成し、前記コイル群を長方形の２辺に平行に置かれた２
つの磁気回路のギャップ内に挿入することによって、ま
た、前記第１の可動部は対物レンズ周辺に設けられた円
筒状突起（ピストン）を、第２の可動部に設けられた円
筒状ガイド（シリンダ）に嵌合することによって直交２
軸のリニアモータを形成し、前記コイル群に流す電流量
、及び、その方向を制御することによって対物レンズの
光軸方向移動、及び、ディスクの半径方向移動を行なう
。The objective lens actuator according to the present invention includes a first movable part that moves the objective lens in the optical axis (focus) direction, a second movable part that moves in the radial direction (trough length) of the disk, and further, the first movable part that moves the objective lens in the optical axis (focus) direction. , consisting of a magnetic circuit that drives a second movable part, an objective lens in the center of the first movable part, an H rectangular focus coil around it, and four tracking coils on the focus coil. The coil group is placed in parallel to two sides of the rectangle.
By inserting the cylindrical protrusion (piston) provided around the objective lens into the gap between the two magnetic circuits, the first movable part can be inserted into the cylindrical guide (piston) provided in the second movable part. ) by fitting the orthogonal 2
A linear motor for the shaft is formed, and by controlling the amount of current flowing through the coil group and its direction, the objective lens is moved in the optical axis direction and the disk is moved in the radial direction.
本発明の上記構成による対物レンズアクヂュエータはフ
レミングの左手の法則によるボイスコイル型リニアモー
タを２謹有し、その１．つは対物レンズの光軸方向にフ
ォーカシングコイルを上下動略せ、また、他のリニアモ
ータはディスクの半径方向にトラッキングコイルを移動
する。前記フォーカシングコイル、及び、トラッキング
コイルは対物レンズと一体化し之第１の可動部に固定さ
れているので対物レンズは直交二方向忙移動する。The objective lens actuator according to the above configuration of the present invention has two voice coil type linear motors according to Fleming's left hand rule, 1. One moves the focusing coil up and down in the direction of the optical axis of the objective lens, and the other linear motor moves the tracking coil in the radial direction of the disk. Since the focusing coil and the tracking coil are integrated with the objective lens and fixed to the first movable part, the objective lens moves in two orthogonal directions.
また、直交２方向の運動は第２の可動部に設けられた円
筒状のガイドにより第１の可動部の運動が規制され、さ
らには第２の可動部は軸と軸受、又は平行板バネによっ
てその運動方向が正しく規制される構成となっている。In addition, the movement of the first movable part in two orthogonal directions is regulated by a cylindrical guide provided on the second movable part, and the second movable part is controlled by a shaft and a bearing or a parallel plate spring. The structure is such that the direction of movement is correctly regulated.
第１図は本発明の分解斜視図、第４図はその中央断面図
である。対物レンズ１０はレンズホルタ゛−１１によっ
て固定され、その周辺には長方形のフォーカシングコイ
ル１２が巻力１れている。またこのフォーカシングコイ
ル上には４個のトラッキングコイル１３が図のように配
置これ、固定これている。請求の範囲で述べた第１の可
動部２５；上記の部分に当り、さらに対物レンズ１０の
周辺には円筒上の突起（ピストン）１４が一体で形成さ
れている。この突起１４は第２の可動部１ｓＫｖ＆けら
れた円筒状のガイド責シリンダ）１６に嵌め合わはれる
。第２の可動部１５には４本の軸１７−固定されており
、その先端は軸受１８に挿入づれる。前記トラッキング
コイル１３．及び、フォーカシングコイル１２は、フォ
ーカシングコイルの二辺に平行に置かれた永久磁石１９
、及びヨーク２０からなる磁気回路のギャップ２１にそ
れぞれ挿入される。今、フォーカシングコイル１２に電
流ｉＦ１、トラッキングコイル１３に電流ｉＴ をそ
れぞれ流すと、その方向は磁界Ｈに垂直となるのでフレ
ミングの左手の法則によりフォーカシングコイルは上下
方向の力を、また、トラッキングコイルは水平方向の力
を受けて各々のコイルが動く。FIG. 1 is an exploded perspective view of the present invention, and FIG. 4 is a central sectional view thereof. The objective lens 10 is fixed by a lens holder 11, and a rectangular focusing coil 12 is wound around it with a winding force of 1. Further, four tracking coils 13 are arranged and fixed on this focusing coil as shown in the figure. The first movable part 25 mentioned in the claims corresponds to the above-mentioned part, and furthermore, a cylindrical projection (piston) 14 is integrally formed around the objective lens 10. This protrusion 14 is fitted into the second movable portion 1sKv&a cut-out cylindrical guide cylinder 16. Four shafts 17 are fixed to the second movable part 15, and their tips are inserted into bearings 18. The tracking coil 13. The focusing coil 12 has permanent magnets 19 placed parallel to two sides of the focusing coil.
, and the gap 21 of the magnetic circuit consisting of the yoke 20. Now, when a current iF1 is applied to the focusing coil 12 and a current iT is applied to the tracking coil 13, their directions are perpendicular to the magnetic field H, so according to Fleming's left hand rule, the focusing coil receives a force in the vertical direction, and the tracking coil receives a force in the vertical direction. Each coil moves in response to a horizontal force.
従って対物レンズの移動はこの運動の合成されたものと
なり、２軸アクチユエータができ上る。運動方向の規制
は第２の可動部に設けた円筒状ガイド１６と、軸１７、
及び軸受１８が行ない、対物レンズの光軸のタオレを防
いでいる。Therefore, the movement of the objective lens is a combination of these movements, resulting in a two-axis actuator. The direction of movement is controlled by a cylindrical guide 16 provided in the second movable part, a shaft 17,
and the bearing 18 prevents the optical axis of the objective lens from becoming distorted.
第５図は本発明の他の実施例を真上から見之図である。FIG. 5 is a view from directly above of another embodiment of the present invention.
対物レンズ１０はレンズホルダー１１に取り付けられ、
レンズホルダーの周囲にはフォーカスコイル１２が巻か
れている。また、その上にはトラッキングコイル１３が
４ケ所固定ばれている。本実施例で特徴となる所は第２
の可動部１５に取りつけられた２枚の板バネ２２であり
、こわは他端が磁気回路のヨーク２０付近に固定されて
いる。図で明らかなように可動部１５は対角状に板バネ
と固定きれている為、紙面で上下方向に微少量平行に動
くことが可能であり、対物レンズの光軸方向（紙面に垂
直方向）には動けない。従−て、第１図の軸と軸受によ
る運動の規制と同じ効果が上られる。The objective lens 10 is attached to a lens holder 11,
A focusing coil 12 is wound around the lens holder. Furthermore, tracking coils 13 are fixed at four locations on top of the coil. The feature of this example is the second
These are two leaf springs 22 attached to the movable part 15 of the holder, and the other end of the stiffener is fixed near the yoke 20 of the magnetic circuit. As is clear from the figure, the movable part 15 is diagonally fixed to the leaf spring, so it can move a small amount parallel to the vertical direction in the plane of the paper, and it can also move in the optical axis direction of the objective lens (in the direction perpendicular to the plane of the paper). ) cannot move. Therefore, the same effect as the movement regulation by the shaft and bearing shown in FIG. 1 can be achieved.
以上述べたように本発明は光ヘッド対物レンズアクチェ
エータに必要な直交２軸の運動を正確に起こすことがで
きる。また、本発明はアクチェエータの小型・薄形化に
最適な設計となっているので、光ヘッド全体の大ききを
少ざくすることができる。ちなみに本発明によるアクチ
ュエータでは幅２５０、奥行１５ｕ１高甥１０關のもの
が試作ぢれており、これを用いた光へ・ラドの総厚も２
０ｎ以下のものとなっている。従って、本発明を用いた
光ヘッドの使用によってハーフコートの極薄形光メモリ
ドライブをまとめることも可能になった。As described above, the present invention can accurately cause the movement of the optical head objective lens actuator in two orthogonal axes. Furthermore, since the present invention has an optimal design for making the actuator smaller and thinner, the overall size of the optical head can be reduced. By the way, an actuator according to the present invention has been prototyped with a width of 250 mm and a depth of 15 mm and a height of 10 mm, and the total thickness of the light beam using this is also 2 mm.
It is 0n or less. Therefore, by using the optical head according to the present invention, it has become possible to assemble a half-coat ultra-thin optical memory drive.
また、本アクチェエータに於て第２の可動部１５の下に
全反射ミラーを固定し、対物レンズのトラッキングの移
動と共にミラーを平行移動ζせればレーザー光は常に対
物レンズの中心を通過する為光軸の移動がなくレンズに
対する光学的な負担の軽いレンズアクチェエータが実現
−ｇれる。In addition, in this actuator, if a total reflection mirror is fixed under the second movable part 15 and the mirror is moved in parallel with the tracking movement of the objective lens, the laser beam always passes through the center of the objective lens. A lens actuator that does not move its axis and places a light optical load on the lens can be realized.
第１図、第４図、第５図は本発明による対物レンズアク
チュエータを示す図である。
第２図、第３図は従来の対物レンズアクチュエータを示
す図である。
１・・・・・・軸
２．２０・・・・・・ヨーク
３・・・・・・筒状部
４．１９・・・・・・磁石
５・・・・・・ヨーク
６・・・・・・ボビン
７．１２・・・・・・フォーカシングコイル８．１３・
・・・・・トラッキングコイル９．１ｏ・・・・・・対
物レンズ
１１ ・・・・・・レンズホルダ
１４・・・・・・円筒状突起
１５・・・・・・可動部
１６・・・・・・ガイド
１７・・・・・・軸
１８・・・・・・軸受
２１・・・・・・磁気ギャップ
２２・・・・・・板バネ
以 上1, 4, and 5 are diagrams showing an objective lens actuator according to the present invention. FIGS. 2 and 3 are diagrams showing conventional objective lens actuators. 1...Axle 2.20...Yoke 3...Cylindrical portion 4.19...Magnet 5...Yoke 6... ...Bobbin 7.12...Focusing coil 8.13.
...Tracking coil 9.1o ...Objective lens 11 ...Lens holder 14 ...Cylindrical projection 15 ...Movable part 16 ... ... Guide 17 ... Shaft 18 ... Bearing 21 ... Magnetic gap 22 ... Leaf spring or more
Claims (3)
第１の可動部、及び、ディスクの半径方向（トラッキン
グ）に移動する第２の可動部、さらには、前記第１、第
２の可動部を駆動する磁気回路からなる対物レンズアク
チュエータに於て、前記第１の可動部は中央に対物レン
ズ、その周辺には長方形のフォーカスコイル、該フォー
カスコイル上には４個のトラッキングコイルを一体で形
成し、前記コイル群を長方形の２辺に平行に置かれた２
つの磁気回路のギャップ内に挿入することによって、ま
た、前記第１の可動部は対物レンズ周辺に設けられた円
筒状突起（ピストン）を、第２の可動部に設けられた円
筒状ガイド（シリンダ）に嵌合することによって、直交
２軸のリニアモータを形成し、前記コイル群に流す電流
量、及びその方向を制御することによって対物レンズの
光軸方向移動、及び、ディスクの半径方向移動を行なう
ことを特徴とする光ヘッド対物レンズアクチュエータ。(1) A first movable part that moves the objective lens in the optical axis (focus) direction, a second movable part that moves in the radial direction (tracking) of the disk, and further the first and second movable parts In an objective lens actuator consisting of a magnetic circuit that drives a part, the first movable part has an objective lens in the center, a rectangular focusing coil around the objective lens, and four tracking coils on the focusing coil. The coil group is placed in parallel to two sides of a rectangle.
By inserting the cylindrical protrusion (piston) provided around the objective lens into the gap between the two magnetic circuits, the first movable part can be inserted into the cylindrical guide (piston) provided in the second movable part. ), a linear motor with two orthogonal axes is formed, and by controlling the amount of current flowing through the coil group and its direction, the objective lens can be moved in the optical axis direction and the disk can be moved in the radial direction. An optical head objective lens actuator characterized by:
ュエータに於て、第２の可動部は複数本の軸とその軸受
によって運動方向が規制されていることを特徴とする光
ヘッド対物レンズアクチュエータ。(2) In the objective lens actuator according to claim 1, the second movable part has a movement direction regulated by a plurality of shafts and their bearings. actuator.
ュエータに於て、第２の可動部は相対する位置に対称に
置かれた２本の板バネによって支えられその運動方向が
規制されていることを特徴とする光ヘッド対物レンズア
クチュエータ。(3) In the objective lens actuator according to claim 1, the second movable part is supported by two leaf springs placed symmetrically at opposite positions, and the direction of movement thereof is regulated. An optical head objective lens actuator characterized by:
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20891484A JPS6187227A (en) | 1984-10-04 | 1984-10-04 | Objective actuator for optical head |
| US06/784,916 US4745589A (en) | 1984-10-04 | 1985-10-04 | Objective lens actuator having movements restricting control means for an optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20891484A JPS6187227A (en) | 1984-10-04 | 1984-10-04 | Objective actuator for optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6187227A true JPS6187227A (en) | 1986-05-02 |
Family
ID=16564205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20891484A Pending JPS6187227A (en) | 1984-10-04 | 1984-10-04 | Objective actuator for optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6187227A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014209142A (en) * | 2013-04-16 | 2014-11-06 | Hoya株式会社 | Drive unit for linearly moving body |
| JP2021076789A (en) * | 2019-11-13 | 2021-05-20 | 新思考電機有限公司 | Lens driving device, camera device, and electronic apparatus |
-
1984
- 1984-10-04 JP JP20891484A patent/JPS6187227A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014209142A (en) * | 2013-04-16 | 2014-11-06 | Hoya株式会社 | Drive unit for linearly moving body |
| JP2021076789A (en) * | 2019-11-13 | 2021-05-20 | 新思考電機有限公司 | Lens driving device, camera device, and electronic apparatus |
| US11470230B2 (en) | 2019-11-13 | 2022-10-11 | New Shicoh Motor Co., Ltd. | Lens driving device, camera device, and electronic apparatus |
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