JPS6255218B2 - - Google Patents
Info
- Publication number
- JPS6255218B2 JPS6255218B2 JP58243289A JP24328983A JPS6255218B2 JP S6255218 B2 JPS6255218 B2 JP S6255218B2 JP 58243289 A JP58243289 A JP 58243289A JP 24328983 A JP24328983 A JP 24328983A JP S6255218 B2 JPS6255218 B2 JP S6255218B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- coil
- information
- track
- tracking
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 description 6
- 239000004020 conductor Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- 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
- G11B7/0927—Electromechanical actuators for lens positioning for focusing only
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、記録媒体にトラツク状に記録された
情報を光学的に読取り再生する装置における情報
検出ヘツドに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information detection head in an apparatus for optically reading and reproducing information recorded in a track shape on a recording medium.
［従来の技術］
情報がトラツク状に記録された記録媒体は、例
えばオーデオデイスク又はビデオデイスクとして
公知である。これらの記録媒体上で情報トラツク
は同心円状又は螺旋状に配置されるのが普通であ
る。このような情報を光学的に読取るための装置
として、記録媒体上に光のスポツトを投影する光
学系と、記録媒体上の情報トラツクと光のスポツ
トとの相対的位置を検出する手段とを具えたもの
は、例えば、特開昭49―10005号公報に記載され
ている。[Prior Art] Recording media on which information is recorded in the form of tracks are known as, for example, audio discs or video discs. On these recording media, the information tracks are usually arranged concentrically or spirally. A device for optically reading such information includes an optical system that projects a spot of light onto a recording medium, and means for detecting the relative position of the information track on the recording medium and the spot of light. This is described, for example, in Japanese Patent Application Laid-open No. 10005/1983.
第３図は前記公知の光学的情報読取装置を概念
的に示すもので、１は記録媒体としてのデイスク
で軸２―２′の回りを回転する。レーザ光源３か
ら放射されるビームは、補助レンズ４，反射鏡５
及び対物レンズ６を経てデイスク上に集光され
る。デイスクの記録された情報によつて、このデ
イスクを透過するか、又は反射する光の強度が変
化するので、光検出器７で光の強度を検出するこ
とにより、デイスクに記録された情報を電気的出
力信号として取出すことができる。 FIG. 3 conceptually shows the above-mentioned known optical information reading device, in which numeral 1 denotes a disk as a recording medium, which rotates around an axis 2-2'. The beam emitted from the laser light source 3 is transmitted through an auxiliary lens 4 and a reflecting mirror 5.
The light passes through the objective lens 6 and is focused onto the disk. The intensity of light transmitted or reflected from the disk changes depending on the information recorded on the disk, so by detecting the intensity of light with the photodetector 7, the information recorded on the disk can be electrically converted. It can be extracted as a physical output signal.
この装置では、光ビーム系をデイスクに対し一
定速度で矢印Ａ方向に移動させてトラツクを大ざ
つぱに追尾させている。情報を正しく読取るため
にレーザ光源３からの光を対物レンズ６によつて
正しくデイスク上に集光させなければならない。
この焦点調節機構は誤差信号検出器８の出力で対
物レンズ６を制御することにより行われる。 In this device, a light beam system is moved in the direction of arrow A at a constant speed with respect to the disk to roughly track the track. In order to read information correctly, the light from the laser light source 3 must be focused correctly onto the disk by the objective lens 6.
This focus adjustment mechanism is performed by controlling the objective lens 6 using the output of the error signal detector 8.
更に、デイスク上に集光される光のスポツト
は、トラツク上に正確に位置決めしなければなら
ない。このため反射鏡５を紙面に垂直な軸の回り
に回動させて光スポツトの位置を制御している。 Furthermore, the spot of light focused on the disk must be precisely positioned on the track. For this reason, the position of the light spot is controlled by rotating the reflecting mirror 5 around an axis perpendicular to the plane of the drawing.
この装置では、反射鏡を小負荷で正確に回動さ
せる必要があり、機構が複雑となると共に対物レ
ンズとして大型、高性能のものが必要となり、全
体として小型、軽量に構成することが困難であつ
た。 In this device, it is necessary to accurately rotate the reflector with a small load, which makes the mechanism complicated and requires a large and high-performance objective lens, making it difficult to make the overall structure compact and lightweight. It was hot.
この反射鏡の回動による不都合を解消するた
め、回動反射鏡を使用しない装置が提案されてい
る。本件の先願である特開昭51―114102号公報に
は、いわゆるスピーカーコイルといわれるつる巻
状に捲回した円筒状の可動コイルを薄板バネで対
物レンズの光軸方向に移動可能に支持し、このコ
イル枠に対物レンズの光軸と直角の一方向にのみ
可撓性を有する薄板バネを介して対物レンズを支
持し、更にこの側方に同様な第２の可動コイルを
その可動軸が対物レンズの光軸と垂直となるよう
に配置し、該可動軸を対物レンズと連結すること
によつて、対物レンズを光軸方向に移動させる焦
点調節だけでなく、これと垂直のデイスクの半径
方向への移動調節も可能としたデイスクプレーヤ
の信号読取制御装置が記載されている。 In order to eliminate the inconvenience caused by the rotation of the reflecting mirror, an apparatus that does not use a rotating reflecting mirror has been proposed. The earlier application in this case, JP-A-51-114102, describes a system in which a cylindrical movable coil wound in a helical shape, called a speaker coil, is supported by a thin plate spring so as to be movable in the optical axis direction of an objective lens. The objective lens is supported on this coil frame via a thin plate spring that is flexible only in one direction perpendicular to the optical axis of the objective lens, and a similar second movable coil is placed on the side of this coil frame so that its movable axis is By arranging the objective lens perpendicularly to the optical axis and connecting the movable axis with the objective lens, it is possible to not only adjust the focus by moving the objective lens in the optical axis direction, but also to adjust the radius of the disk perpendicular to this. A signal reading control device for a disc player is described which also allows movement adjustment in the directions.
［発明が解決しようとする問題点］
デイスクに記録される情報トラツクの幅は１μ
ｍ以下でトラツクの間隔も１μｍ台であるので、
対物レンズの焦点合わせ（以下フオーカシングと
いう）の制御目標は、±1.0μｍ以内とし、光スポ
ツトの位置をトラツクに追随させる（以下トラツ
キングという）制御目標は、±0.1μｍ以内とする
必要がある。[Problem to be solved by the invention] The width of the information track recorded on the disk is 1 μ.
m or less, and the track spacing is on the order of 1 μm, so
The control target for focusing the objective lens (hereinafter referred to as focusing) must be within ±1.0 μm, and the control target for causing the position of the light spot to follow a track (hereinafter referred to as tracking) must be within ±0.1 μm.
このため対物レンズを含む制御のための可動部
分は、小型、軽量であると共に駆動に際し対物レ
ンズの光軸が傾斜しないようにバランスのとれた
形態であることが極めて重要である。 Therefore, it is extremely important that the movable parts for control, including the objective lens, be small and lightweight, and have a well-balanced form so that the optical axis of the objective lens does not tilt during driving.
前記先願に示されたものは、対物レンズをフオ
ーカシングとトラツキングの二方向に制御するも
のであるが、可動コイル型フオーカシング機構に
基本的にはこれと同種の駆動機構を直角に組合せ
てトラツキングを行なうようにしたものであるの
で、次のような問題点がある。 The device shown in the above-mentioned prior application controls the objective lens in two directions, focusing and tracking, but the moving coil focusing mechanism is basically combined with the same type of drive mechanism at right angles to perform tracking. Since this method is designed to be carried out, there are the following problems.
対物レンズをフオーカシングとトラツキングの
二方向に駆動するため、夫々別個の支持、駆動機
構を設けて対物レンズと中間機構を介して連結し
たものであるから、部品点数が多くなると共に、
対物レンズを含む可動部分の重量が大となつて情
報検出ヘツドを小型、軽量に構成することが困難
であつた。 In order to drive the objective lens in two directions, focusing and tracking, separate support and drive mechanisms are provided for each and connected to the objective lens via an intermediate mechanism, which increases the number of parts and
The weight of the movable parts including the objective lens is large, making it difficult to make the information detection head small and lightweight.
［問題点を解決するための手段及び作用］
本発明は、対物レンズと対物レンズをフオーカ
シングとトラツキングの二方向に電磁駆動するた
めの夫々のコイルとを、一体的に構成した対物レ
ンズ保持体に共に固定し、これらが一体となつて
移動可能な可動体を構成するようにしたもので、
フオーカシング用コイルに制御電流が流れると、
該コイルに対物レンズの光軸方向の力が働き、対
物レンズは両コイルを一体的に保持した対物レン
ズ保持体と共に光軸方向に移動し、フオーカシン
グが行われる。トラツキング用コイルに制御電流
が流れると、該コイルの磁気ギヤツプ中にある導
線部分に対物レンズの光軸と直角で且つデイスク
の半径方向の力が働き、対物レンズは対物レンズ
保持体と共に同方向に移動し、トラツキングが行
われる。[Means and effects for solving the problems] The present invention provides an objective lens holder that integrates an objective lens and respective coils for electromagnetically driving the objective lens in two directions, focusing and tracking. They are fixed together and together form a movable body.
When a control current flows through the focusing coil,
A force in the optical axis direction of the objective lens acts on the coil, and the objective lens moves in the optical axis direction together with an objective lens holder that integrally holds both coils, thereby performing focusing. When a control current flows through the tracking coil, a force perpendicular to the optical axis of the objective lens and in the radial direction of the disk acts on the conductive wire in the magnetic gap of the coil, causing the objective lens to move in the same direction as the objective lens holder. movement and tracking.
［実施例］
第１図に本発明の一実施例を示す。対物レンズ
１０１は、対物レンズ鏡筒１０２、円盤状のコイ
ル支持体１０３と円筒状のコイル支持体とを一体
的に取付け固定した対物レンズ保持体の一端に取
付けられている。[Example] FIG. 1 shows an example of the present invention. The objective lens 101 is attached to one end of an objective lens holder in which an objective lens barrel 102, a disk-shaped coil support 103, and a cylindrical coil support are integrally attached and fixed.
このコイル支持体１０３の片側に渦巻状に密に
巻かれたコイル１０３ａを接着剤などにより固定
する。このコイル１０３ａはその導線の一部が永
久磁石１０４ａの磁気ギヤツプに配置され、図示
しないリード線を介しトラツキング用の制御電流
が供給される。対物レンズ鏡筒１０２の他端の円
筒状コイル支持体には、その外周につる巻状に密
に巻かれたコイル１０３ｃを接着剤などにより固
定してある。このコイル１０３ｃは、ベース１１
０に固定された環状の永久磁石１０４ｃの磁気ギ
ヤツプ中に配置され、図示しないリード線を介し
フオーカシング用の制御電流が供給される。以上
のように、対物レンズとこれを駆動するための両
コイルは、一体的に形成された対物レンズ保持体
に共に固定され、円錐バネ１１４の一端を該対物
レンズ保持体に固定し、他端をベース１１０に固
定してある。 A tightly wound spiral coil 103a is fixed to one side of the coil support 103 using an adhesive or the like. A part of the conductive wire of this coil 103a is placed in the magnetic gap of the permanent magnet 104a, and a control current for tracking is supplied through a lead wire (not shown). A cylindrical coil support at the other end of the objective lens barrel 102 has a coil 103c tightly wound around its outer periphery fixed to it with an adhesive or the like. This coil 103c is connected to the base 11
It is placed in a magnetic gap of an annular permanent magnet 104c fixed at zero, and a control current for focusing is supplied through a lead wire (not shown). As described above, the objective lens and both coils for driving the same are fixed together to the objective lens holder formed integrally, one end of the conical spring 114 is fixed to the objective lens holder, and the other end is fixed to the objective lens holder. is fixed to the base 110.
この実施例では、制御電流がコイル１０３ｃに
供給されると、永久磁石１０４ｃの磁場によつて
コイル１０３ｃに対物レンズ１０１の光軸方向の
力が働き、円錐バネ１１４で弾性的に支持された
対物レンズ保持体は、それに固定されたコイルと
共に対物レンズ１０１を矢印Ｃ方向に変位させて
フオーカシングを行なう。また、コイル１０３ａ
に制御電流が供給されると、コイル１０３ａにそ
の導線と直角の矢印Ａ方向の力が働き、対物レン
ズ保持体は円錐バネ１１４でその方向にも弾性的
に支持されているので、矢印Ａ方向に変位してト
ラツキングを行う。 In this embodiment, when a control current is supplied to the coil 103c, a force in the optical axis direction of the objective lens 101 is applied to the coil 103c by the magnetic field of the permanent magnet 104c, and the objective lens 101 is elastically supported by the conical spring 114. The lens holder, together with a coil fixed thereto, displaces the objective lens 101 in the direction of arrow C to perform focusing. In addition, the coil 103a
When a control current is supplied to the coil 103a, a force in the direction of the arrow A perpendicular to the conductor acts on the coil 103a, and since the objective lens holder is elastically supported in that direction by the conical spring 114, the force in the direction of the arrow A is applied to the coil 103a. Tracking is performed by displacing the
第２図は、弾性支持部材の他の例を示すもの
で、渦巻状に巻いた一つの板バネ１１２を用いた
ものである。この板バネ１１２は一端を対物レン
ズ保持体に、また他端をベース１１０に固定した
固定部材１１３に取付けてある。この渦巻状バネ
１１２は密に巻かれていないので、その軸線方向
にもまたそれと直交する方向にも変位可能で、対
物レンズ１０１は第１図の実施例と同様にフオー
カシングとトラツキングが行なわれる。 FIG. 2 shows another example of the elastic support member, which uses one spirally wound leaf spring 112. This leaf spring 112 is attached at one end to the objective lens holder and at the other end to a fixing member 113 fixed to the base 110. Since this spiral spring 112 is not tightly wound, it can be displaced both in the direction of its axis and in a direction perpendicular thereto, and the objective lens 101 performs focusing and tracking in the same manner as in the embodiment of FIG.
また、コイル支持体１０３にトラツキング用コ
イルとは別に、その内側に渦巻状に密に巻いたコ
イルを固定し、そのコイルの導線を両側から挟む
ように永久磁石１０４の磁気ギヤツプを臨ませ、
該永久磁石を対物レンズの光軸と直行する平面内
でトラツキング用永久磁石と互いに直角になるよ
うに配置し、該コイルに制御電流を供給すると、
コイルの導線に直角方向の力が働らき、対物レン
ズを情報トラツクと同一方向の矢印Ｂ方向に変位
させることもできる。 In addition to the tracking coil, a coil tightly wound in a spiral shape is fixed to the inside of the coil support 103 in addition to the tracking coil, and the magnetic gap of the permanent magnet 104 is faced so as to sandwich the conductor of the coil from both sides.
When the permanent magnet and the tracking permanent magnet are arranged at right angles to each other in a plane perpendicular to the optical axis of the objective lens, and a control current is supplied to the coil,
A force in the perpendicular direction acts on the conductor of the coil, and it is also possible to displace the objective lens in the direction of arrow B, which is the same direction as the information track.
［発明の効果］
本発明は、対物レンズと対物レンズをフオーカ
シングとトラツキングの二方向に電磁駆動するた
めの夫々のコイルとを、対物レンズ保持体に共に
固定し、これらを一体に構成するようにしたか
ら、対物レンズとこれを駆動する部材を連結する
中間部材を必要とせず、部品点数が少なく、情報
検出ヘツドを小型に構成できると共に、電磁駆動
される可動部分がフオーカシングとトラツキング
の二方向とも同一の対物レンズ保持体であるの
で、弾性支持部材を夫々別個に設ける必要がな
く、簡潔に構成することが可能となる。[Effects of the Invention] The present invention has a structure in which an objective lens and respective coils for electromagnetically driving the objective lens in two directions of focusing and tracking are fixed together to an objective lens holder, and these are integrally constructed. Therefore, there is no need for an intermediate member that connects the objective lens and the member that drives it, the number of parts is small, the information detection head can be configured in a compact size, and the movable part that is electromagnetically driven can be used in both focusing and tracking directions. Since the objective lens holder is the same, there is no need to provide separate elastic support members, and the structure can be simplified.
第１図は本発明の一実施例を一部断面で示す側
面図、第２図は他の実施例を示す斜視図、第３図
は従来技術の説明図である。
１０１は対物レンズ、１０２は対物レンズ鏡
筒、１０３ａはフオーカシング用コイル、１０３
ｃはトラツキング用コイル、１１２，１１４は弾
性支持体。
FIG. 1 is a side view, partially in section, of one embodiment of the present invention, FIG. 2 is a perspective view of another embodiment, and FIG. 3 is an explanatory diagram of the prior art. 101 is an objective lens, 102 is an objective lens barrel, 103a is a focusing coil, 103
c is a tracking coil, and 112 and 114 are elastic supports.
Claims (1)
対物レンズにより集光される光スポツトにより走
査して読取り再生するもので、記録媒体上の情報
トラツクと光スポツトとの相対的位置を検出し
て、情報トラツクに対して直角をなす横方向と情
報トラツクの面に対して垂直な二方向に互いに独
立して対物レンズを制御する光学的情報読取装置
において、前記対物レンズと該対物レンズを記録
媒体に対して前記の二方向に互いに独立して電磁
駆動するためのコイルとを対物レンズ保持体に対
し一体的に固定し、これらが一体となつて移動可
能な可動体を構成するようにしたことを特徴とす
る光学的情報検出ヘツド。1 Information recorded in a track shape on a recording medium is read and reproduced by scanning with a light spot focused by an objective lens, and the relative position of the information track and the light spot on the recording medium is detected. , an optical information reading device that controls an objective lens independently of each other in two directions, one in a lateral direction perpendicular to the information track and the other in two directions perpendicular to the plane of the information track, wherein the objective lens and the objective lens are connected to a recording medium. and a coil for electromagnetically driving the lens in the two directions independently from each other are integrally fixed to the objective lens holder, and these together constitute a movable body that is movable. An optical information detection head characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24328983A JPS59160833A (en) | 1983-12-23 | 1983-12-23 | Driving device for projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24328983A JPS59160833A (en) | 1983-12-23 | 1983-12-23 | Driving device for projection lens |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50130528A Division JPS5811692B2 (en) | 1975-10-08 | 1975-10-31 | The current state of affairs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59160833A JPS59160833A (en) | 1984-09-11 |
| JPS6255218B2 true JPS6255218B2 (en) | 1987-11-18 |
Family
ID=17101627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24328983A Granted JPS59160833A (en) | 1983-12-23 | 1983-12-23 | Driving device for projection lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59160833A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09115159A (en) * | 1996-11-05 | 1997-05-02 | Olympus Optical Co Ltd | Optical system supporting device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4965845A (en) * | 1972-08-26 | 1974-06-26 | ||
| JPS5255424A (en) * | 1975-10-31 | 1977-05-06 | Olympus Optical Co Ltd | Information detection head of inforamation reader |
-
1983
- 1983-12-23 JP JP24328983A patent/JPS59160833A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4965845A (en) * | 1972-08-26 | 1974-06-26 | ||
| JPS5255424A (en) * | 1975-10-31 | 1977-05-06 | Olympus Optical Co Ltd | Information detection head of inforamation reader |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09115159A (en) * | 1996-11-05 | 1997-05-02 | Olympus Optical Co Ltd | Optical system supporting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59160833A (en) | 1984-09-11 |
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