JPH03141042A - Optical disk player - Google Patents

Optical disk player

Info

Publication number
JPH03141042A
JPH03141042A JP24806290A JP24806290A JPH03141042A JP H03141042 A JPH03141042 A JP H03141042A JP 24806290 A JP24806290 A JP 24806290A JP 24806290 A JP24806290 A JP 24806290A JP H03141042 A JPH03141042 A JP H03141042A
Authority
JP
Japan
Prior art keywords
coil
objective lens
bobbin
optical axis
coils
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
Application number
JP24806290A
Other languages
Japanese (ja)
Other versions
JPH0524570B2 (en
Inventor
Katsuaki Tsurushima
鶴島 克明
Kenji Shintani
賢司 新谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP24806290A priority Critical patent/JPH03141042A/en
Publication of JPH03141042A publication Critical patent/JPH03141042A/en
Publication of JPH0524570B2 publication Critical patent/JPH0524570B2/ja
Granted legal-status Critical Current

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Abstract

PURPOSE:To improve driving efficiency with simple constitution by executing focusing and tracking servo only by an objective lens device consisting of an objective lens, a holding member, a magnetic core, a bobbin, and a coil, etc. CONSTITUTION:A moving part consisting of the objective lens 4 and the bobbin 13, etc., can freely move along the optical axis of the lens 4. Then, the 1st coil 14 wound around the bobbin 13, the 2nd coil consisting of plural rectangular coils 15a and 15b which are attached to the bobbin 13, magnetic cores 16a and 16b constituting a common magnetic circuit which acts to the coils 15a and 15b, and a magnet 17 are provided. One of the winding parts R of the coils 15a and 15b orthogonally crossed with the coil 14 is disposed in a non- magnetic field part and a focusing servo signal is given to the coil 14. By moving the moving part along the optical axis of the lens 4, the focusing servo is executed. By giving a tracking servo signal to the coils 15a and 15b, the moving part is turned to execute the tracking servo.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光ビームを対物レンズを用いてディスク上に集
光させて情報を検出する光学ディスクプレーヤに関する
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc player that detects information by focusing a light beam onto a disc using an objective lens.

〔発明の概要〕[Summary of the invention]

本発明は光ビームを対物レンズを用いてディスク上に集
光させて情報を検出する光学ディスクプレーヤにおいて
、対物レンズとボビン等から成る可動部をこの対物レン
ズの光軸に沿って移動自在であって、かつこの対物レン
ズの光軸から所定長離間した位置を中心として回動自在
に支持する支持手段と、このボビンに巻回された第1の
コイルと、このボビンに取付けられた複数の矩形状コイ
ルから成る第2のコイルと、この第1のコイルとこの第
2のコイルの双方に作用する共通の磁気回路を構成する
磁気コアと磁石とを具備し、この矩形状コイルの第1の
コイルと直交する巻線部の一方を非磁界部に配せしめ、
この第1のコイルにフォーカスサーボ信号を与えこの可
動部をこの対物レンズの光軸に沿って移動させてフォー
カシングサーボを、この第2のコイルにトラッキングサ
ーボ信号を与えこの可動部を回動させてトラッキングサ
ーボを行うようにすることにより、磁気回路の小型化、
省部品化並びに効率向上を図ったものである。
The present invention is an optical disc player that detects information by focusing a light beam onto a disc using an objective lens. a support means rotatably supporting the objective lens at a position spaced a predetermined distance from the optical axis; a first coil wound around the bobbin; and a plurality of rectangular coils attached to the bobbin. A second coil made of a rectangular shaped coil, and a magnetic core and a magnet forming a common magnetic circuit that acts on both the first coil and the second coil. One of the winding parts orthogonal to the coil is placed in the non-magnetic field part,
A focus servo signal is applied to this first coil to move this movable part along the optical axis of this objective lens to operate a focusing servo, and a tracking servo signal is applied to this second coil to rotate this movable part. By implementing tracking servo, the magnetic circuit can be miniaturized.
The aim is to reduce parts and improve efficiency.

〔従来の技術及び発明が解決しようとする課題〕光学デ
ィスクプレーヤにおいては、レーザー光源からの光ビー
ムが対物レンズを通してディスク上に正確に焦点を結ぶ
ようにフォーカシングサーボ〈Fサーボ)を行うと共に
、ディスク上の情報ピット列が対物レンズの光軸と一致
するようにトラッキングサーボ(Tサーボ)を行う。
[Prior Art and Problems to be Solved by the Invention] In an optical disc player, a focusing servo (F servo) is performed so that the light beam from a laser light source is accurately focused on the disc through an objective lens, and the disc Tracking servo (T servo) is performed so that the upper information pit row coincides with the optical axis of the objective lens.

第11!fに第1の従来例装置を示す。この従来例では
レーザー光源(1)からの光ビームがビームスプリッタ
(2)を通じてガルバノミラ−(3)に供給され、この
ガルバノミラ−(3)で反射されて対物レンズ(4)に
供給される。なお(5)は光学ディスク、(6)はディ
スク(5)を回転させるモータである。ここでガルバノ
ミラ−(3)はコイルに供給される信号に応じて反射の
角度が変化され、対物レンズ(4)はコイルに供給され
る信号に応じてディスク(5)との距離が変化される。
11th! The first conventional device is shown in f. In this conventional example, a light beam from a laser light source (1) is supplied to a galvano mirror (3) through a beam splitter (2), reflected by this galvano mirror (3), and supplied to an objective lens (4). Note that (5) is an optical disk, and (6) is a motor that rotates the disk (5). Here, the angle of reflection of the galvanometer mirror (3) is changed according to the signal supplied to the coil, and the distance of the objective lens (4) to the disk (5) is changed according to the signal supplied to the coil. .

さらにディスク(5)からの反射光が対物レンズ(4)
、ガルバノミラ−(3)を通じてビームスプリッタ(2
)に供給され、このビームスプリッタ(2)で反射され
て光検出器(7〕に供給される。そして光検出器(7)
で検出された再生信号が出力端子(8)に出力されると
共に、光検出器(7)の一部で検出されたフォーカシン
グ及びトラッキングのサーボ信号が、対物レンズ(4)
及びガルバノミラ−(3)に供給されて、Fサーボ及び
Tサーボが行われる。
Furthermore, the reflected light from the disk (5) is sent to the objective lens (4).
, beam splitter (2) through galvano mirror (3)
), reflected by this beam splitter (2), and supplied to the photodetector (7).Then, the photodetector (7)
The reproduction signal detected by the is output to the output terminal (8), and the focusing and tracking servo signals detected by a part of the photodetector (7) are output to the objective lens (4).
It is supplied to the galvanometer mirror (3), and F servo and T servo are performed.

すなわち対物レンズ(荀を前後させてFサーボを行うと
共に、ガルバノミラ−(3)の反射方向を変化させてT
サーボを行う。
In other words, by moving the objective lens back and forth to perform F servo, and by changing the reflection direction of the galvanometer mirror (3),
Perform servo.

ところがこの装置の場合、Fサーボを行う対物レンズ(
4)とTサーボを行うガルバノミラ−(3)とが独立の
ために、これらの装置を例えば光軸を一致させて取り付
けるのが困難であり、組み立て時に調整を行うなど作業
が複雑になる。またガルバノミラ−(3)に高域の複共
振が生じやすく、さらにミラー(3)をゴム等で支持し
ているため動作にヒステリシスが出るなど、動作が正確
に行なわれない欠点もあった。
However, in the case of this device, the objective lens (
4) and the galvanomirror (3) that performs the T servo are independent, making it difficult to mount these devices with their optical axes aligned, for example, and making adjustments during assembly complicated. In addition, the galvano mirror (3) tends to produce multiple high-frequency resonances, and since the mirror (3) is supported by rubber or the like, there is hysteresis in the operation, which prevents accurate operation.

上述した欠点を解消できるものとして、フォーカスコイ
ルとトラッキングコイルを各別のボビンに取付けて、個
別の磁気回路内に配し、軸に対し摺動及び回動可能に支
持された対物レンズを上下動させることでFサーボを行
うとともに回動させることでTサーボを行う技術が特開
昭55−117745号公報に開示されている。
As a solution to the above-mentioned drawbacks, the focusing coil and the tracking coil are mounted on separate bobbins and arranged in separate magnetic circuits, and the objective lens, which is supported so as to be slidable and rotatable about the axis, can be moved up and down. JP-A-55-117745 discloses a technique for performing F servo by rotating the shaft and performing T servo by rotating the shaft.

本発明は上述の欠点を除去するとともに磁気回路の小型
化、省部品化並びに効率向上を目的としたものである。
The present invention aims to eliminate the above-mentioned drawbacks, as well as to reduce the size of the magnetic circuit, reduce the number of components, and improve efficiency.

〔課題を解決するための手段〕[Means to solve the problem]

本発明光学ディスクプレーヤは例えば第2図〜第5図に
示す如く光ビームを対物レンズ(4)を用いてディスク
(5)上に集光させて情報を検出する光学ディスクプレ
ーヤにおいて、対物レンズ(4)とボビン(13)等か
ら成る可動部をこの対物レンズ(4)の光軸に沿って移
動自在であって、かつ、この対物レンズ(4)の光軸か
ら所定長離間した位置を中心として回動自在に支持する
支持手段(11)と、このボビン(13)に巻回された
第1のコイル(14)と、このボビン(13)に取付け
られた複数の矩形状コイル(15a)(15b)  か
ら成る第2のコイルと、この第1のコイル(14)とこ
の第2のコイル(15a) (15b)の双方に作用す
る共通の磁気回路を構成する磁気コア(16a)(16
b)  と磁石(17)とを具備し、この矩形状コイル
(15a) (15b)のこの第1のコイル(14)と
直交する巻線部の一方Rを非磁界部に配せしめ、この第
1のコイル(14)にフォーカスサーボ信号を与え、こ
の可動部をこの対物レンズ(4)の光軸に沿って移動さ
せてフォーカシングサーボを、この第2のコイル(15
a) (15b)にトラッキングサーボ信号を与え、こ
の可動部を回動させてトラッキングサーボを行うように
したものである。
The optical disc player of the present invention is an optical disc player that detects information by converging a light beam onto a disc (5) using an objective lens (4), as shown in FIGS. 2 to 5, for example. 4), a bobbin (13), etc., is movable along the optical axis of this objective lens (4), and is centered at a position spaced a predetermined distance from the optical axis of this objective lens (4). a first coil (14) wound around this bobbin (13); and a plurality of rectangular coils (15a) attached to this bobbin (13). (15b) and magnetic cores (16a) (16) constituting a common magnetic circuit that acts on both the first coil (14) and the second coils (15a) (15b).
b) and a magnet (17), one R of the winding part orthogonal to the first coil (14) of the rectangular coils (15a) (15b) is arranged in the non-magnetic field part, and the first A focus servo signal is applied to the first coil (14), and this movable part is moved along the optical axis of this objective lens (4) to activate the focusing servo.
a) A tracking servo signal is applied to (15b), and this movable part is rotated to perform tracking servo.

〔作用〕[Effect]

本発明に依れば対物レンズ(4)、保持部材(11)、
フランジ(12)、ボビン(13)、コイル(14) 
(15a) (15b)等より成る対物レンズ装置(4
)のみでフォーカシングサーボ及びトラッキングサーボ
を行うので、構成が簡単となると共に光軸の一致等も容
易に取ることができ、更にレーザー光源(1)、ビーム
スプリッタ(2)、対物レンズ装置(4’)を直線に配
置することができ、これらを一体に形成することにより
装置の組み立て等を容易にすることができ、また組み立
て時の調整等も不要になる。更に本発明に依れば矩形状
コイル(15a) (15b)のコイル(14)と直交
する巻線部の一方R(リターン部R)を非磁界部に配せ
しめたので、サーボ信号による駆動効率の向上が達成で
きる。
According to the present invention, the objective lens (4), the holding member (11),
Flange (12), bobbin (13), coil (14)
Objective lens device (4) consisting of (15a) (15b) etc.
) performs focusing servo and tracking servo, the configuration is simple and alignment of the optical axes can be easily achieved. ) can be arranged in a straight line, and by forming them integrally, assembly of the device, etc. can be facilitated, and adjustments etc. at the time of assembly are also unnecessary. Furthermore, according to the present invention, one R (return part R) of the winding part orthogonal to the coil (14) of the rectangular coils (15a) (15b) is arranged in the non-magnetic field part, so that the drive efficiency by the servo signal is improved. improvement can be achieved.

〔実施例〕〔Example〕

以下、図面を参照しながら、本発明について説明しよう
The present invention will be described below with reference to the drawings.

まず、第2図は本発明に使用される対物レンズ装置の原
理図を示し、Aは断面図、Bは上面図、Cは巻線の様子
を示す斜視断面図である。
First, FIG. 2 shows the principle of the objective lens device used in the present invention, in which A is a sectional view, B is a top view, and C is a perspective sectional view showing the state of the winding.

この第2図において、対物レンズ(4)がほぼ中心部に
載置される保持部材(11)の周囲にフランジ(12)
が設けられ、このフランジ(12)の周縁部にレンズ(
4)の光軸方向に延長された円筒状のボビン(13)の
一端が接続される。このボビン(13)の周囲に、ボビ
ン(13)を巡るように巻回された第1のコイル(14
)が設けられる。さらにボビン(13)の周囲の互いに
対向する位置にレンズ(4)の光軸方向に巻回された第
2のコイル(15a) (15b)が設けられる。
In FIG. 2, a flange (12) is provided around the holding member (11) on which the objective lens (4) is placed approximately in the center.
is provided, and a lens (
4) is connected to one end of a cylindrical bobbin (13) extending in the optical axis direction. A first coil (14) is wound around the bobbin (13).
) is provided. Further, second coils (15a) (15b) are provided around the bobbin (13) at positions facing each other and wound in the optical axis direction of the lens (4).

またボビン(13)の内側及びコイル(14)、(15
a)(15b) の外側に磁気コア(16a) (16
b)が設けられると共に、コア(16a) (16b)
の所定部に磁石(17)が設けられてコア(16a) 
(16b)間にコイル(14) (15a) (15b
)を貫通する磁場を形成するようにされる。
Also, the inside of the bobbin (13) and the coils (14), (15)
a) (15b) Magnetic core (16a) (16
b) is provided with a core (16a) (16b)
A magnet (17) is provided at a predetermined portion of the core (16a).
(16b) Between the coils (14) (15a) (15b
) to create a magnetic field that penetrates the

また保持部材(11)の周縁部にレンズ(4)の光軸方
向に延長された円筒状のバレル(18)の一端が接続さ
れると共に、内側の磁気コア(16b) の内側にスペ
ーサ(19)が設けられて、バレル(18)の位置規制
が行われる。なお、バレル(18)とボビン(13)と
は同心円状に配置される。
Further, one end of a cylindrical barrel (18) extending in the optical axis direction of the lens (4) is connected to the peripheral edge of the holding member (11), and a spacer (19) is connected to the inner side of the inner magnetic core (16b). ) is provided to regulate the position of the barrel (18). Note that the barrel (18) and the bobbin (13) are arranged concentrically.

そして保持部材(11)において、レンズ(4)が、そ
の光軸が上述のバレル(18)及びボビン〈13)の中
心軸より所定長離間された位置となるように取り付けら
れる。
The lens (4) is attached to the holding member (11) so that its optical axis is spaced a predetermined distance from the central axes of the barrel (18) and bobbin (13).

従ってこの装置において、コイル(14)に電流が流さ
れると、その電流の大きさに応じて、対物レンズ(4)
、保持部材(11)、フランジ(12)、ボビン(13
)、コイル(14)、(15a) (15b)、バレル
〈18)が第2図Aの矢印aのように移動される。
Therefore, in this device, when a current is passed through the coil (14), the objective lens (4) changes depending on the magnitude of the current.
, holding member (11), flange (12), bobbin (13)
), coil (14), (15a) (15b), and barrel (18) are moved as shown by arrow a in FIG. 2A.

またコイル(15a) (15b)に電流が流されると
、その電流の大きさに応じて、上述の対物レンズ(4)
〜バレル(18)が第2図Bの矢印すのようにボビン(
13)の中心を回転軸として回動される。
Furthermore, when a current is passed through the coils (15a) (15b), the objective lens (4)
~The barrel (18) is attached to the bobbin (as shown by the arrow in Figure 2B).
13) is rotated about the rotation axis.

そしてこの場合に、ボビン(13)の中心と対物レンズ
(4)の光軸が所定長離間されているので、レンズ(4
)の光軸は第2図Bの破線のように移動し、光軸が左右
に移動される。
In this case, since the center of the bobbin (13) and the optical axis of the objective lens (4) are separated by a predetermined length, the lens (4)
) moves as shown by the broken line in FIG. 2B, and the optical axis is moved left and right.

すなわちこの装置において、コイル(14)に電流を流
すことによりFサーボを行い、コイル(15a)(15
b)  に電流を流すことによりTサーボを行うことが
できる。
That is, in this device, F servo is performed by passing a current through the coil (14), and the coil (15a) (15
b) T servo can be performed by passing current through.

さらに第3図は本発明に適用される光学ディスクプレー
ヤの構成を示す。
Further, FIG. 3 shows the configuration of an optical disc player to which the present invention is applied.

図においてレーザー光源(1)からの光ビームがビーム
スプリッタ(2)を通じて上述した構成の対物レンズ装
置(4′)に供給される。またディスク(5)からの反
射光が対物レンズ族W (4’)を通じてビームスプリ
フタ(2)に供給され、このビームスプリッタ(2)で
反射されて光検出器(7)に供給される。そして光検出
器(7)の一部で検出されたフォーカシング及びトラッ
キングのサーボ信号が、対物レンズ装置(4′)の上述
したコイル(14)及び(15a) (15b)に供給
される。
In the figure, a light beam from a laser light source (1) is supplied through a beam splitter (2) to an objective lens device (4') configured as described above. Further, reflected light from the disk (5) is supplied to the beam splitter (2) through the objective lens group W (4'), reflected by the beam splitter (2), and supplied to the photodetector (7). Focusing and tracking servo signals detected by a part of the photodetector (7) are supplied to the above-mentioned coils (14), (15a) and (15b) of the objective lens device (4').

こうして光学ディスクプレーヤにおいてフォーカシング
サーボ及びトラッキングサーボが行われるわけであるが
、この構成によれば、対物レンズ装置(4′)のみで2
軸のサーボを行うので、構成が極めて簡単になると共に
、光軸の一致等も容易に取ることができる。
In this way, focusing servo and tracking servo are performed in an optical disc player, but according to this configuration, only the objective lens device (4') can perform two
Since the axis is servoed, the configuration is extremely simple and the optical axes can be easily aligned.

マタカルバノミラーを用いないので、Il[共振ヤヒス
テリシスによる不都合も生じない。
Since no mata carbanomirror is used, there is no inconvenience caused by Il[resonance hysteresis.

さらにレーザー光源、ビームスプリッタ、対物レンズ装
置が直線に配置されるので、これらを−体に形成するこ
とにより、装置の組み立て等を極めて容易にすることが
でき、また組み立て時の調整等も不要になる。更には共
通の磁気回路内に第1のコイル(14)と第2のコイル
(15a) (15b)とを配したので小型化並びに省
部品化が図れる。
Furthermore, since the laser light source, beam splitter, and objective lens device are arranged in a straight line, by forming them in a single body, assembly of the device can be made extremely easy, and there is no need for adjustments during assembly. Become. Furthermore, since the first coil (14) and the second coils (15a) (15b) are arranged in a common magnetic circuit, miniaturization and component saving can be achieved.

そこで第4図は本発明による対物レンズ装置(4′)の
−例である。この図においてコイル(15k>(15b
)  はそれぞれ図示のようにリターン部Rが2分割さ
れ、それぞれ駆動部Mと90度の角度位置1こ配置され
るようにして、全体として直方形に構成する。また少な
くとも磁気コア(1(1)  のコイル(15a) (
15b)のリターン部Rに対向する部分に切欠を設ける
FIG. 4 therefore shows an example of an objective lens arrangement (4') according to the invention. In this figure, the coil (15k>(15b
), the return part R is divided into two parts as shown in the figure, and each part is arranged at one angular position of 90 degrees with respect to the drive part M, so that the whole is formed into a rectangular parallelepiped shape. Also, at least the coil (15a) of the magnetic core (1 (1)) (
A notch is provided in the portion facing the return portion R of 15b).

すなわちコイル(15a) (15b)は第5図の斜視
図に示すように構成されると共に、コア(16a)  
は−点鎖線で示すように切欠が設けられる。
That is, the coils (15a) (15b) are constructed as shown in the perspective view of FIG. 5, and the core (16a)
A notch is provided as shown by a dashed line.

従ってこの構成において、コイル(15a) (15b
)の駆動部Mに同方向の電流が流されると、コイル(1
5a) (15b)と磁気コア(16a) (16b)
間の磁界との間でボビン(13)を回動する方向の力が
発生する。なおこのときリターン部Rには逆方向の電流
が流れるが、このときリターン部Rに対向する部分の磁
気コア(16a)  が切欠かれているので、リターン
部Rには磁界がなく、力は発生しない。即ちリターン部
Rを非磁界部に配したので、サーボ信号による駆動効率
の向上が達成できる。
Therefore, in this configuration, the coil (15a) (15b
), when a current in the same direction is passed through the drive unit M of the coil (1
5a) (15b) and magnetic core (16a) (16b)
A force in the direction of rotating the bobbin (13) is generated between the magnetic field and the magnetic field between the two. At this time, a current flows in the opposite direction in the return part R, but since the magnetic core (16a) in the part facing the return part R is cut out, there is no magnetic field in the return part R, and no force is generated. do not. That is, since the return section R is disposed in the non-magnetic field section, it is possible to improve the drive efficiency using the servo signal.

こうしてこの構成によれば、ボビン(13)が回動され
ることにより、第2図で述べた様に光軸を左右に移動さ
せることができると共に、極めて簡単な構成で装置を実
現することができる。
Thus, according to this configuration, by rotating the bobbin (13), the optical axis can be moved left and right as described in FIG. 2, and the device can be realized with an extremely simple configuration. can.

〔発明の効果〕〔Effect of the invention〕

本発明に依れば対物レンズ(4)、保持部材(11)、
フランジ(12)、ボビ/(13)、コイル(14) 
(15a) (15b)等より成る対物レンズ装置(4
′)のみでフォーカシングサーボ及びトラッキングサー
ボを行うので、構成が簡単となると共に光軸の一致等も
容易に取ることができる利益があり、更にレーザー光源
(1)、ビームスプリッタ(2)、対物レンズ装置(4
′)を直線に配置することができ、これらを一体に形成
することにより装置の組み立て等を容易にすることがで
きる利益があり、また組み立て時の調整等が不要となる
利益がある。更に本発明に依れば矩形状コイル(15a
) (15b)のコイル(14)と直交する巻線部の一
方R(IJターン部R)を非磁界部に配せしめたので、
サーボ信号による駆動効率の向上が達成できる利益があ
る。
According to the present invention, the objective lens (4), the holding member (11),
Flange (12), Bobi/(13), Coil (14)
Objective lens device (4) consisting of (15a) (15b) etc.
Since the focusing servo and tracking servo are performed only with the laser light source (1), beam splitter (2), and objective lens, the configuration is simple and the alignment of the optical axes can be easily achieved. Device (4
') can be arranged in a straight line, and by integrally forming them, there is an advantage that assembly of the device can be facilitated, and there is also an advantage that adjustment etc. at the time of assembly are unnecessary. Furthermore, according to the present invention, a rectangular coil (15a
) Since one R (IJ turn part R) of the winding part orthogonal to the coil (14) in (15b) is arranged in the non-magnetic field part,
There are benefits that can be achieved by improving drive efficiency with servo signals.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来の装置の構成図、第2図、第3図は本発明
の詳細な説明するための図、第4図、第5図は本発明の
一例の構成図である。 (1)はレーザー光源、(2)はビームスプリッタ、(
4)は対物レンズ、(4′)は対物レンズ装置、(7)
は光検出器、(14) (15a) (15b)はコイ
ル、(16a) (16b)は磁気コアである。
FIG. 1 is a block diagram of a conventional apparatus, FIGS. 2 and 3 are diagrams for explaining the present invention in detail, and FIGS. 4 and 5 are block diagrams of an example of the present invention. (1) is a laser light source, (2) is a beam splitter, (
4) is the objective lens, (4') is the objective lens device, (7)
is a photodetector, (14), (15a), and (15b) are coils, and (16a) and (16b) are magnetic cores.

Claims (1)

【特許請求の範囲】[Claims]  光ビームを対物レンズを用いてディスク上に集光させ
て情報を検出する光学ディスクプレーヤにおいて、対物
レンズとボビン等から成る可動部を上記対物レンズの光
軸に沿って移動自在であって、かつ、上記対物レンズの
光軸から所定長離間した位置を中心として回動自在に支
持する支持手段と、上記ボビンに巻回された第1のコイ
ルと、上記ボビンに取付けられた複数の矩形状コイルか
ら成る第2のコイルと、上記第1のコイルと上記第2の
コイルの双方に作用する共通の磁気回路を構成する磁気
コアと磁石とを具備し、上記矩形状コイルの上記第1の
コイルと直交する巻線部の一方を非磁界部に配せしめ、
上記第1のコイルにフォーカスサーボ信号を与え上記可
動部を上記対物レンズの光軸に沿って移動させてフォー
カシングサーボを、上記第2のコイルにトラッキングサ
ーボ信号を与え上記可動部を回動させてトラッキングサ
ーボを行うようにしたことを特徴とする光学ディスクプ
レーヤ。
In an optical disc player that detects information by focusing a light beam on a disc using an objective lens, a movable part consisting of an objective lens, a bobbin, etc. is movable along the optical axis of the objective lens, and , a support means rotatably supporting the objective lens about a position spaced a predetermined distance from the optical axis; a first coil wound around the bobbin; and a plurality of rectangular coils attached to the bobbin. and a magnetic core and a magnet that constitute a common magnetic circuit that acts on both the first coil and the second coil, the first coil being a rectangular coil. One of the winding parts perpendicular to is arranged in the non-magnetic field part,
A focusing servo signal is applied to the first coil to move the movable part along the optical axis of the objective lens to operate a focusing servo, and a tracking servo signal is applied to the second coil to rotate the movable part. An optical disc player characterized by performing tracking servo.
JP24806290A 1990-09-18 1990-09-18 Optical disk player Granted JPH03141042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24806290A JPH03141042A (en) 1990-09-18 1990-09-18 Optical disk player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24806290A JPH03141042A (en) 1990-09-18 1990-09-18 Optical disk player

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP25009694A Division JPH07182673A (en) 1994-09-19 1994-09-19 Optical disc player

Publications (2)

Publication Number Publication Date
JPH03141042A true JPH03141042A (en) 1991-06-17
JPH0524570B2 JPH0524570B2 (en) 1993-04-08

Family

ID=17172639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24806290A Granted JPH03141042A (en) 1990-09-18 1990-09-18 Optical disk player

Country Status (1)

Country Link
JP (1) JPH03141042A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494007A (en) * 1978-01-05 1979-07-25 Olympus Optical Co Ltd Pickup for disc recorder recorded optically with information
JPS5555444A (en) * 1978-10-16 1980-04-23 Hitachi Ltd Optical pickup
JPS5580834A (en) * 1978-12-08 1980-06-18 Thomson Csf Accessing device for track provided in optical recordable and readable medium * and optical system including said device
JPS55117745A (en) * 1979-03-01 1980-09-10 Mitsubishi Electric Corp Disk reproducing device using optical stylus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494007A (en) * 1978-01-05 1979-07-25 Olympus Optical Co Ltd Pickup for disc recorder recorded optically with information
JPS5555444A (en) * 1978-10-16 1980-04-23 Hitachi Ltd Optical pickup
JPS5580834A (en) * 1978-12-08 1980-06-18 Thomson Csf Accessing device for track provided in optical recordable and readable medium * and optical system including said device
JPS55117745A (en) * 1979-03-01 1980-09-10 Mitsubishi Electric Corp Disk reproducing device using optical stylus

Also Published As

Publication number Publication date
JPH0524570B2 (en) 1993-04-08

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