JPH0664752B2 - Light head - Google Patents
Light headInfo
- Publication number
- JPH0664752B2 JPH0664752B2 JP59260073A JP26007384A JPH0664752B2 JP H0664752 B2 JPH0664752 B2 JP H0664752B2 JP 59260073 A JP59260073 A JP 59260073A JP 26007384 A JP26007384 A JP 26007384A JP H0664752 B2 JPH0664752 B2 JP H0664752B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- lens
- focusing
- tracking
- 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.)
- Expired - Lifetime
Links
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
- G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
Landscapes
- Optical Recording Or Reproduction (AREA)
- Mechanical Optical Scanning Systems (AREA)
Description
【発明の詳細な説明】 （技術分野） 本発明は、例えば光学式記録ディスクに記録した情報を
再生したり、このようなディスクに情報を記録するため
の光ヘッドに関するものである。Description: TECHNICAL FIELD The present invention relates to an optical head for reproducing information recorded on an optical recording disc or recording information on such a disc.
（従来技術） 従来、記録媒体上に光スポットを照射する対物レンズ
を、その光軸と平行なフォーカシング方向およびこのフ
ォーカシング方向と直交するトラッキング方向に移動可
能に支持する支持機構と、対物レンズを前記フォーカシ
ング方向およびトラッキング方向に駆動する駆動機構と
を具える光ヘッドは既知であり、例えば特開昭59-10473
3号公報に記載されている。この既知の光ヘッドでは対
物レンズを支持する支持部材とベースとの間にフォーカ
シング方向およびトラッキング方向に直交する方向に延
在するフォーカシング用板ばねとトラッキング用板ばね
とを設け、フォーカシング用板ばねの一端を対物レンズ
支持部材に固定し他端を中継部材に固定すると共にトラ
ッキング用板ばねの一端を中継部材に固定し他端をベー
スに固定して対物レンズをフォーカシング方向及びトラ
ッキング方向に移動可能に支持している。そして、対物
レンズ支持部材のトラッキング方向の両側にトラッキン
グコイルを設けると共に対物レンズの光軸方向の下側に
ボビンを取り付けこのボビンにフォーカシングコイルを
装着し、フォーカシングコイル及びトラッキングコイル
に駆動電流を供給してフォーカシング制御及びトラッキ
ング制御を行なうように構成されている。(Prior Art) Conventionally, a support mechanism for movably supporting an objective lens for irradiating a light spot on a recording medium in a focusing direction parallel to an optical axis of the objective lens and a tracking direction orthogonal to the focusing direction, and the objective lens are described above. An optical head having a driving mechanism that drives in the focusing direction and the tracking direction is known, and is disclosed in, for example, JP-A-59-10473.
It is described in Japanese Patent No. 3 publication. In this known optical head, a focusing leaf spring and a tracking leaf spring that extend in a direction orthogonal to the focusing direction and the tracking direction are provided between the support member that supports the objective lens and the base. One end is fixed to the objective lens support member and the other end is fixed to the relay member, and one end of the leaf spring for tracking is fixed to the relay member and the other end is fixed to the base so that the objective lens can be moved in the focusing direction and the tracking direction. I support you. Then, tracking coils are provided on both sides of the objective lens supporting member in the tracking direction, a bobbin is attached to the lower side of the objective lens in the optical axis direction, a focusing coil is attached to this bobbin, and a driving current is supplied to the focusing coil and the tracking coil. Focusing control and tracking control are performed.
一方、特開昭56-119944号公報の第６〜８図には、磁界
発生手段として永久磁石をベースに固定すると共に、レ
ンズが固定された支持部材（図番56）の側面にフォーカ
シングコイルとトラッキングコイルとを一体的に固定
し、これらフォーカシングコイルと前記トラッキングコ
イルへ記録媒体の面に平行な磁束を差し向けるようにし
た構成が説明されている。On the other hand, in FIGS. 6 to 8 of JP-A-56-119944, a permanent magnet as a magnetic field generating means is fixed to a base, and a focusing coil is provided on a side surface of a supporting member (FIG. 56) to which a lens is fixed. A configuration is described in which the tracking coil is integrally fixed, and the magnetic flux parallel to the surface of the recording medium is directed to the focusing coil and the tracking coil.
しかし、前述の特開昭59-104733号公報並びに特開昭56-
119944号公報開示の構成は、いずれも支持部材の周りを
巻回することによりフォーカシングコイルを支持部材に
固定しているため、光ヘッドの組み立てが複雑となる欠
点がある。However, the above-mentioned JP-A-59-104733 and JP-A-56-104733
Each of the configurations disclosed in Japanese Patent Publication No. 119944 fixes the focusing coil to the support member by winding the support member around the support member, and thus has a drawback that the assembly of the optical head becomes complicated.
かかる欠点を解決したものに、実開昭58-118541号公報
第４〜６図に開示のものがある。One of the solutions to this drawback is disclosed in Japanese Utility Model Laid-Open No. 58-118541, FIGS.
当該公報には、レンズの支持体の周りを巻回すること無
く、フォーカシングコイルとトラッキングコイルとをコ
イル面での接合に基づき両コイルを支持部材に固定した
構成が説明されている。The publication describes a configuration in which both the focusing coil and the tracking coil are fixed to a supporting member by joining the focusing coil and the tracking coil on the coil surface without winding around the supporting body of the lens.
かかる構成では、フォーカシングコイル並びにトラッキ
ングコイルの両コイルを支持部材に例えば接着などで単
に結合すれば固定が完了するから、光ヘッドの組み立て
は前述の特開昭59-104733号公報並びに特開昭56-119944
号公報開示の構成と比較すると著しく簡単となる。In such a configuration, fixing is completed by simply joining both coils of the focusing coil and the tracking coil to the support member by, for example, adhering, so that the optical head is assembled by the above-mentioned Japanese Patent Laid-Open Nos. 59-104733 and 56-56. -119944
This is remarkably simple as compared with the configuration disclosed in the publication.
しかし、かかる構成ではフォーカシングのための電磁力
が当該公報第4,5図の情報トラック方向に関して可動体
の左側面のみで発生するため、可動体の重心位置と電磁
力の発生する位置とが極端に離れた関係となるためフォ
ーカシング駆動は安定性に欠いたものになる欠点があ
る。However, in such a configuration, the electromagnetic force for focusing is generated only on the left side surface of the movable body with respect to the information track direction in FIGS. 4 and 5, and therefore the position of the center of gravity of the movable body and the position where the electromagnetic force is generated are extremely large. Focusing drive has the drawback of lacking stability because of the distant relationship.
（発明の目的） 本発明の目的は上述した欠点を解決した光ヘッドを提供
することを目的とする。(Object of the Invention) It is an object of the present invention to provide an optical head which solves the above-mentioned drawbacks.
（発明の概要） 本発明の光ヘッドは、情報がトラック状に記録された記
録媒体に光源からの光束を支持部材に固定されたレンズ
により収束光として照射しその反射光により前記情報を
読み取るものであって、磁界発生手段をベースに固定
し、前記記録媒体の媒体面に垂直な第１の方向に前記レ
ンズを駆動するための第１のコイルと前記媒体面に平行
で情報トラックを横切る第２の方向に前記レンズを駆動
するための第２のコイルの両コイルを前記支持部材に巻
き付けることなくコイル面での接合に基づき（レンズの
支持部材の周りを巻回することによりコイルを支持部材
に固定するのではなく、例えば導線を予めコイル状に形
成した状態でこのコイル導線を支持部材に結合するなど
の態様をいう）により前記支持部材に固定し、前記レン
ズが前記第１及び前記第２の両コイルと一体となって移
動し得るように構成すると共に前記第１及び前記第２の
両コイルへ前記磁界発生手段から発した前記媒体面に平
行な磁束を差し向けるようにした光ヘッドにおいて、 前記支持部材には前記第１の方向と前記第２の方向の両
方向にほぼ直角な第３の方向に延在した第１の部分と第
２の部分とを有し且つ前記第１の部分と前記第２の部分
とは前記第２の方向に関して空間を挟むように位置さ
れ、更に前記レンズの光軸と前記空間とはほぼ前記第３
の方向に沿って配列されるものであり、前記第１の部分
と前記第２の部分とを貫くと共に前記第２の方向に沿っ
た仮想直線群（前記第１の部分と前記第２の部分の両方
の部分を貫き且つ前記第２の方向に沿った多数の直線か
ら成る束をいう）と交差する位置に前記第１のコイル、
前記第２のコイル並びに前記磁界発生手段をそれぞれ配
置し、両コイルに発生する力を利用して前記レンズを前
記第１の方向と前記第２の方向へ移動するようにしたこ
とを特徴とするものである。(Summary of the Invention) An optical head of the present invention irradiates a recording medium on which information is recorded in a track shape with a light flux from a light source as converged light by a lens fixed to a supporting member and reads the information by reflected light thereof. A magnetic field generating means is fixed to the base, and a first coil for driving the lens in a first direction perpendicular to the medium surface of the recording medium and a first coil that crosses the information track in parallel with the medium surface. The two coils of the second coil for driving the lens in the two directions are not wound around the support member but based on the joining at the coil surface (the coil is supported by winding around the support member of the lens. Fixed to the supporting member by, for example, connecting the coil conducting wire to a supporting member in a state where the conducting wire is previously formed into a coil, and fixing the lens to the lens. It is configured so that it can move integrally with both the first and second coils, and a magnetic flux generated from the magnetic field generating means and parallel to the medium surface is inserted into both the first and second coils. In the optical head configured to be directed, the support member has a first portion and a second portion extending in a third direction substantially perpendicular to both the first direction and the second direction. And the first portion and the second portion are positioned so as to sandwich a space in the second direction, and the optical axis of the lens and the space are substantially the third.
Of the virtual straight line groups (the first portion and the second portion) which are arranged along the second direction and which penetrate the first portion and the second portion. The first coil at a position that intersects with a bundle of straight lines passing through both parts of
The second coil and the magnetic field generating means are respectively arranged, and the lens is moved in the first direction and the second direction by utilizing the force generated in both coils. It is a thing.
（実施例） 第１図〜第３図は本発明による光ヘッドの一例の構成を
示すものであり、第１図は分解斜視図、第２図は一部を
断面で示す平面図、第３図は断面図である。光ディスク
のような記録媒体上に光スポット照射する対物レンズ１
を、対物レンズ支持部材２に装着する。この支持部材２
は例えば軽量な一体成型で作り、対物レンズ１、フォー
カシングコイル及びトラッキングコイルを装着した基板
３及びバランサ４を装着する。(Embodiment) FIGS. 1 to 3 show the structure of an example of an optical head according to the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a plan view partially showing a section, and FIG. The figure is a sectional view. Objective lens 1 for irradiating a light spot on a recording medium such as an optical disc
Is mounted on the objective lens supporting member 2. This support member 2
Is made by, for example, a lightweight integral molding, and the objective lens 1, the substrate 3 on which the focusing coil and the tracking coil are mounted, and the balancer 4 are mounted.
この支持部材２を対物レンズ１の光軸と平行なフォーカ
シング方向Ｆに変位させて光スポットを記録媒体上に集
束させると共に記録媒体上の情報トラック及び光軸と直
交するトラッキング方向Ｔに変位させて光スポットが情
報トラックを追従するようにするために対物レンズ支持
部材２を支持機構を介してベース５に連結する。本例で
はこの支持機構を一対のフォーカシング用板ばね６及び
７と、中継部材８と、一対のトラッキング用板ばね９及
び10とを以って構成する。The support member 2 is displaced in the focusing direction F parallel to the optical axis of the objective lens 1 to focus the light spot on the recording medium and at the same time displaced in the tracking direction T orthogonal to the information track and the optical axis on the recording medium. The objective lens support member 2 is connected to the base 5 via a support mechanism so that the light spot follows the information track. In this example, this support mechanism is composed of a pair of focusing leaf springs 6 and 7, a relay member 8, and a pair of tracking leaf springs 9 and 10.
一対のフォーカシング用板ばね６及び７は、それぞれ２
個の脚部6a及び7aと橋落部6b及び7bとから成る「コの
字」状をしており、フォーカシング方向に見て互いに平
行に対向しながら各脚部6a及び7aがフォーカシング方向
Ｆ及びトラッキング方向Ｔに対して直交する方向に延在
するように各脚部6a及び7aの各端部を４個の押え板11a
〜11dにより支持部材２に固定し、各橋落部6b及び7bを
押え板12a及び12bにより中継部材８に固定する。また、
平板状の一対のトラッキング用板ばね９及び10は、トラ
ッキング方向Ｔに見てある角度αを以って対向しながら
フォーカシング方向Ｆ及びトラッキング方向Ｔとほぼ直
交する方向に延在するようにそれぞれの一端を中継部材
８に形成した左右の溝8a及び8bに装着すると共に他端を
ベース５と一体に形成したポスト13及び14に形成した溝
13a及び14aに装着する。The pair of focusing leaf springs 6 and 7 are respectively 2
The leg portions 6a and 7a and the bridge portions 6b and 7b have a "U" shape, and the leg portions 6a and 7a face each other in parallel with each other when viewed in the focusing direction. Each of the leg portions 6a and 7a is provided with four holding plates 11a so as to extend in a direction orthogonal to the tracking direction T.
It fixes to the support member 2 by 11d, and each bridge part 6b and 7b is fixed to the relay member 8 by the holding plates 12a and 12b. Also,
The pair of flat plate-shaped tracking leaf springs 9 and 10 are arranged so as to extend in a direction substantially orthogonal to the focusing direction F and the tracking direction T while facing each other at an angle α when viewed in the tracking direction T. Grooves formed on the posts 13 and 14 with one end attached to the left and right grooves 8a and 8b formed on the relay member 8 and the other end formed integrally with the base 5.
Attach to 13a and 14a.
このようにして対物レンズ１は中継部材８を介してフォ
ーカシング方向Ｆ及びトラッキング方向Ｔに移動可能に
支持される。In this way, the objective lens 1 is movably supported in the focusing direction F and the tracking direction T via the relay member 8.
次に対物レンズ１をフォーカシング方向Ｆ及びトラッキ
ング方向Ｔへ駆動する駆動機構について説明する。フォ
ーカシングコイルを「ロの字」形状をした１個の偏平コ
イル15で構成し、トラッキングコイルも「ロの字」形状
をした２個の偏平コイル16及び17で構成し、フォーカシ
ングコイル15を基板３の一方の面に装着すると共に、２
個のトラッキングコイル16及び17をトラッキング方向に
並べて基板３の他方の面に装着する。そして、各コイル
を装着した基板３を対物レンズ支持部材２の一部である
第１の部分2Lと第２の部分2Mのそれぞれに形成した溝2a
及び2b間にフォーカシングコイル15及びトラッキングコ
イル16及び17が共にフォーカシング方向Ｆ及びトラッキ
ング方向Ｔに平行になるように装着する。これらフォー
カシングコイル15及びトラッキングコイル16及び17と共
働する磁界を発生する磁界発生部材を、磁性材料より成
るヨーク18と永久磁石19とを以って構成する。ヨーク18
はフォーカシング方向Ｆ及びトラッキング方向Ｔに平行
で互いに対向する２個の脚部18aと18bとを具え、一方の
脚部18aに永久磁石19を固定してヨーク18をベース５に
固定する。さらに、フォーカシングコイル15のトラッキ
ング方向Ｔと平行なコイル部のうち一方のコイル部15a
だけを永久磁石19とヨーク18の脚部18aとが対向する面
内に位置させ、各トラッキングコイル16及び17のフォー
カシング方向Ｔと平行なコイル部のうちそれぞれ一方の
コイル部16a及び17aだけを永久磁石19とヨーク18の脚部
18bとが対向する面内に位置させる。このように構成す
ることにより、各コイルに駆動電流を供給すればフォー
カシングコイル15のコイル部15aがフォーカシング方向
Ｆに作用する力を受け、トラッキングコイル16及び17は
コイル部16a及び17aがトラッキング方向Ｔに作用する力
を受けることになる。Next, a drive mechanism for driving the objective lens 1 in the focusing direction F and the tracking direction T will be described. The focusing coil is composed of one flat coil 15 having a "square" shape, and the tracking coil is also composed of two flat coils 16 and 17 having a "square" shape. Attach to one side of 2 and
The individual tracking coils 16 and 17 are arranged in the tracking direction and mounted on the other surface of the substrate 3. Then, the substrate 3 on which each coil is mounted is formed in each of the first portion 2L and the second portion 2M, which are a part of the objective lens supporting member 2, and the groove 2a is formed.
And 2b, the focusing coil 15 and the tracking coils 16 and 17 are mounted so as to be parallel to the focusing direction F and the tracking direction T. A magnetic field generating member that generates a magnetic field that cooperates with the focusing coil 15 and the tracking coils 16 and 17 is composed of a yoke 18 made of a magnetic material and a permanent magnet 19. York 18
Has two leg portions 18a and 18b which are parallel to each other in the focusing direction F and the tracking direction T and face each other. The permanent magnet 19 is fixed to one leg portion 18a to fix the yoke 18 to the base 5. Further, one coil portion 15a of the coil portions parallel to the tracking direction T of the focusing coil 15 is provided.
Is placed in a plane where the permanent magnet 19 and the leg portion 18a of the yoke 18 face each other, and only one of the coil portions 16a and 17a of the tracking coils 16 and 17 parallel to the focusing direction T is permanent. Leg of magnet 19 and yoke 18
It is located in a plane facing 18b. With this configuration, when a driving current is supplied to each coil, the coil portion 15a of the focusing coil 15 receives a force acting in the focusing direction F, and the tracking coils 16 and 17 have the coil portions 16a and 17a moved in the tracking direction T. You will receive the force that acts on.
今、フォーカシングエラーの大きさ及び方向に応じた振
巾及び極性を有するフォーカシング駆動電流をフォーカ
シングコイル15に流すと、このコイルを通る磁界との相
互作用によりフォーカシングコイル15、したがって対物
レンズ支持部材２及び対物レンズ１はフォーカシング方
向Ｆに力を受け、一対のフォーカシング用板ばね６及び
７の撓みによってフォーカシング方向に変位し、光ビー
ムを記録媒体上に微小な光スポットとして集束させるこ
とができる。この場合、対物レンズ１は中継部材８を支
点にしてフォーカシング方向Ｆに偏移するから、対物レ
ンズ１と中継部材８との間にフォーカシングコイル15を
装着すればフォーカシングコイル15の偏移量は中継部材
８から対物レンズ１までの距離とフォーカシングコイル
15までの距離の比によりほぼ定まるので、フォーカシン
グコイル15の偏移量が小さくても対物レンズ１の偏移量
を大きくすることができる。尚、この場合中継部材８も
フォーカシング用板ばね６及び７を介してフォーカシン
グ方向の力を受けるが、トラッキング用板ばね９及び10
の主平面はフォーカシング方向Ｆと平行となっているた
めこの方向には殆ど変形しないので、中継部材８がフォ
ーカシング方向に変化することはない。Now, when a focusing drive current having a amplitude and a polarity according to the magnitude and direction of the focusing error is passed through the focusing coil 15, the focusing coil 15 and hence the objective lens supporting member 2 and The objective lens 1 receives a force in the focusing direction F, is displaced in the focusing direction by the bending of the pair of focusing leaf springs 6 and 7, and can focus the light beam as a minute light spot on the recording medium. In this case, since the objective lens 1 shifts in the focusing direction F with the relay member 8 as a fulcrum, if the focusing coil 15 is mounted between the objective lens 1 and the relay member 8, the shift amount of the focusing coil 15 is relayed. Distance from member 8 to objective lens 1 and focusing coil
Since it is almost determined by the ratio of the distances up to 15, the deviation amount of the objective lens 1 can be increased even if the deviation amount of the focusing coil 15 is small. In this case, the relay member 8 also receives the force in the focusing direction via the leaf springs 6 and 7 for focusing, but the leaf springs 9 and 10 for tracking are used.
Since the main plane of is parallel to the focusing direction F and is hardly deformed in this direction, the relay member 8 does not change in the focusing direction.
一方、情報トラックに対する光スポットのずれの大きさ
および方向に応じた振幅及び極性を有するトラッキング
駆動電流を一対のトラッキングコイル16及び17に供給す
ると、磁界との相互作用によりトラッキングコイル16,1
7、したがって支持部材２および対物レンズ１はトラッ
キング方向Ｔの力を受け、トラッキング用板ばね９及び
10の撓みによって対物レンズ１はトラッキング方向Ｔに
変位することになる。On the other hand, when a tracking drive current having an amplitude and a polarity depending on the magnitude and direction of the deviation of the light spot with respect to the information track is supplied to the pair of tracking coils 16 and 17, the tracking coils 16 and 1 are caused by the interaction with the magnetic field.
7, therefore the support member 2 and the objective lens 1 receive a force in the tracking direction T, and the tracking leaf spring 9 and
The deflection of 10 causes the objective lens 1 to be displaced in the tracking direction T.
この場合には中継部材８はトラッキング方向Ｔの力を受
けるが、フォーカシング用板ばね6,7の主表面はトラッ
キング方向Ｔに延在しているためこの方向には変位しな
いのでトラッキング方向の力が中継部材８、すなわちト
ラッキング用板ばね９及び10に正確に伝わることにな
る。したがって対物レンズはトラッキング駆動電流に対
応してトラッキング方向Ｔに正確に駆動されることにな
る。In this case, the relay member 8 receives a force in the tracking direction T, but since the main surfaces of the focusing leaf springs 6 and 7 extend in the tracking direction T, they are not displaced in this direction, so that the force in the tracking direction is applied. It is accurately transmitted to the relay member 8, that is, the tracking leaf springs 9 and 10. Therefore, the objective lens is accurately driven in the tracking direction T according to the tracking drive current.
第４図はフォーカシング用板ばね6,7及びトラッキング
用板ばね9,10の構造を示す断面図である。本例では板ば
ねを、ブチルゴムなどの粘弾性シート21の両面にリン青
銅などの弾性シート22及び23を挟持して構成する。この
ような板ばねのダンピング特性はフォーカシング及びト
ラッキング駆動用としてきわめて良好なものとなり、所
望の周波数領域における共振を有効に防止することがで
き、正確な駆動制御を行なうことができる。ただし、本
発明はこのような板ばねにのみ限定されるものではな
い。FIG. 4 is a sectional view showing the structures of the leaf springs 6 and 7 for focusing and the leaf springs 9 and 10 for tracking. In this example, the leaf spring is configured by sandwiching elastic sheets 22 and 23 such as phosphor bronze on both sides of a viscoelastic sheet 21 such as butyl rubber. The damping characteristic of such a leaf spring becomes extremely good for focusing and tracking drive, resonance in a desired frequency range can be effectively prevented, and accurate drive control can be performed. However, the present invention is not limited to such a leaf spring.
第３図に示すように対物レンズ１及びこれを支持する支
持部材２の光軸方向の寸法は小さいので、この下方にプ
リズム20を配置して光源からの光を対物レンズ１へ向け
反射させたり、記録媒体で反射され、対物レンズ１を通
過した光束を受光器へ向け反射させる。このように構成
すると、光ヘッド全体の対物レンズ１の光軸方向に見た
寸法を著しく小さくすることができ、小型化の点できわ
めて有利である。As shown in FIG. 3, since the objective lens 1 and the supporting member 2 supporting the objective lens 1 have small dimensions in the optical axis direction, a prism 20 is arranged below the objective lens 1 to reflect the light from the light source toward the objective lens 1. The light flux reflected by the recording medium and passing through the objective lens 1 is reflected toward the light receiver. According to this structure, the size of the entire optical head when viewed in the optical axis direction of the objective lens 1 can be significantly reduced, which is extremely advantageous in terms of downsizing.
（発明の効果） 本発明の光ヘッドは、情報がトラック状に記録された記
録媒体に光源からの光束を支持部材（例えば前記実施例
の対物レンズ支持部材２）に固定されたレンズにより収
束光として照射しその反射光により前記情報を読み取る
ものであって、磁界発生手段をベースに固定し、前記記
録媒体の媒体面に垂直な第１の方向（前記実施例のＦ方
向）に前記レンズを駆動するための第１のコイルと前記
媒体面に平行で情報トラックを横切る第２の方向（例え
ば前記実施例のＴ方向）に前記レンズを駆動するための
第２のコイルの両コイルを前記支持部材に巻き付けるこ
となくコイル面での接合に基づき前記支持部材に固定
し、前記レンズが前記第１及び前記第２の両コイルと一
体となって移動し得るように構成すると共に前記第１及
び前記第２の両コイルへ前記磁界発生手段から発した前
記媒体面に平行な磁束を差し向けるようにした光ヘッド
において、 前記支持部材には前記第１の方向と前記第２の方向の両
方向にほぼ直角な第３の方向に延在した第１の部分（例
えば前記実施例の第１の部分2L）と第２の部分（例えば
前記実施例の第２の部分2M）とを有し且つ前記第１の部
分と前記第２の部分とは前記第２の方向に関して空間
（例えば前記実施例の第１の部分2Lと第２の部分2Mとの
間の空間部分）を挟むように配置され、更に前記レンズ
の光軸と前記空間とはほぼ前記第３の方向に沿って配列
されるものであり、前記第１の部分と前記第２の部分と
を貫くと共に前記第２の方向に沿った仮想直線群と交差
する位置に前記第１のコイル、前記第２のコイル並びに
前記磁界発生手段をそれぞれ配置し、前記両コイルに発
生する力を利用して前記レンズを前記第１の方向と前記
第２の方向へ移動するようにしたから、前述した従来技
術に比較して小型軽量で且つ安定性のあるフォーカシン
グ駆動ができ、しかも製作が簡単な光ヘッドを実現でき
る利点がある。(Effect of the Invention) In the optical head of the present invention, the light flux from the light source is converged by the lens fixed to the supporting member (for example, the objective lens supporting member 2 of the above-described embodiment) on the recording medium in which information is recorded in a track shape. The magnetic field generating means is fixed to the base, and the lens is moved in the first direction (F direction in the embodiment) perpendicular to the medium surface of the recording medium. Both the first coil for driving and the second coil for driving the lens in a second direction parallel to the medium surface and transverse to the information track (for example, the T direction in the embodiment) are supported. The lens is fixed to the support member based on the joining on the coil surface without being wound around the member, and the lens is configured to be movable integrally with the first and second coils, and the first and front In an optical head in which magnetic flux generated from the magnetic field generating means and parallel to the medium surface is directed to the second both coils, the support member is provided in both the first direction and the second direction. A first portion (eg, the first portion 2L of the above embodiment) and a second portion (eg, the second portion 2M of the above embodiment) extending in a substantially orthogonal third direction, and The first portion and the second portion are arranged so as to sandwich a space (for example, a space portion between the first portion 2L and the second portion 2M of the embodiment) with respect to the second direction, Further, the optical axis of the lens and the space are arranged substantially along the third direction, and penetrate the first portion and the second portion and extend along the second direction. The first coil, the second coil, and the magnetic field generator are arranged at positions intersecting the virtual straight line group. Are arranged respectively, and the lens is moved in the first direction and the second direction by utilizing the force generated in the both coils. There is an advantage that it is possible to realize an optical head that can perform stable focusing drive and is easy to manufacture.
第１図は本発明による光ヘッドの一例の構成を示す分解
斜視図、 第２図及び第３図は同じくその平面図及び断面図、 第４図は板ばねの構成を示す断面図である。 １……対物レンズ、２……対物レンズ支持部材 ３……基板、４……バランサ ５……ベース 6,7……フォーカシング用板ばね ８……中継部材 9,10……トラッキング用板ばね 11,12……押え板、13,14……ポスト 15……フォーカシングコイル 16,17……トラッキングコイル 18……ヨーク、19……永久磁石 20……プリズム、21……粘弾性シート 22,23……弾性シートFIG. 1 is an exploded perspective view showing the structure of an example of an optical head according to the present invention, FIGS. 2 and 3 are plan views and sectional views of the same, and FIG. 4 is a sectional view showing the structure of a leaf spring. 1 ... Objective lens, 2 ... Objective lens supporting member 3 ... Substrate, 4 ... Balancer 5 ... Base 6,7 ... Focusing leaf spring 8 ... Relay member 9, 10 ... Tracking leaf spring 11 , 12 …… Presser plate, 13,14 …… Post 15 …… Focusing coil 16,17 …… Tracking coil 18 …… Yoke, 19 …… Permanent magnet 20 …… Prism, 21 …… Viscoelastic sheet 22,23… … Elastic sheet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石川 和正 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 (72)発明者 杉本 洋一 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 (72)発明者 小林 章兵 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 (72)発明者 武者 徹 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 (56)参考文献 特開 昭59−160835（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumasa Ishikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Yoichi Sugimoto 2-43-2 Hatagaya, Shibuya-ku, Tokyo Within Olympus Optical Co., Ltd. (72) Inventor Shohei Kobayashi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Toru Musha 2-43-2 Hatagaya, Shibuya-ku, Tokyo Within Olympus Optical Co., Ltd. (56) Reference JP-A-59-160835 (JP, A)
Claims (1)
光源からの光束を支持部材に固定されたレンズにより収
束光として照射しその反射光により前記情報を読み取る
ものであって、磁界発生手段をベースに固定し、前記記
録媒体の媒体面に垂直な第１の方向に前記レンズを駆動
するための第１のコイルと前記媒体面に平行で情報トラ
ックを横切る第２の方向に前記レンズを駆動するための
第２のコイルの両コイルを前記支持部材に巻き付けるこ
となくコイル面での接合に基づき前記支持部材に固定
し、前記レンズが前記第１及び前記第２の両コイルと一
体となって移動し得るように構成すると共に前記第１及
び前記第２の両コイルへ前記磁界発生手段から発した前
記媒体面に平行な磁束を差し向けるようにした光ヘッド
において、 前記支持部材には前記第１の方向と前記第２の方向の両
方向にほぼ直角な第３の方向に延在した第１の部分と第
２の部分とを有し且つ前記第１の部分と前記第２の部分
とは前記第２の方向に関して空間を挟むように配置さ
れ、更に前記レンズの光軸と前記空間とはほぼ前記第３
の方向に沿って配列されるものであり、前記第１の部分
と前記第２の部分とを貫くと共に前記第２の方向に沿っ
た仮想直線群と交差する位置に前記第１のコイル、前記
第２のコイル並びに前記磁界発生手段をそれぞれ配置
し、前記両コイルに発生する力を利用して前記レンズを
前記第１の方向と前記第２の方向へ移動するようにした
ことを特徴とする光ヘッド。1. A magnetic field generating means for irradiating a recording medium on which information is recorded in a track shape with a light flux from a light source as convergent light by a lens fixed to a supporting member and reading the information by the reflected light. Fixed to a base, and a first coil for driving the lens in a first direction perpendicular to the medium surface of the recording medium, and the lens in a second direction parallel to the medium surface and crossing the information track. Both coils of the second coil for driving are fixed to the support member based on the joining at the coil surface without being wound around the support member, and the lens is integrated with the first and second coils. An optical head that is configured to be movable by moving the magnetic field and directs magnetic flux parallel to the medium surface emitted from the magnetic field generating means to the first and second coils. The member has a first portion and a second portion extending in a third direction substantially orthogonal to both the first direction and the second direction, and the first portion and the first portion. The second part is arranged so as to sandwich a space in the second direction, and the optical axis of the lens and the space are substantially the third part.
The first coil, the first coil, the second coil being arranged along the direction of the first coil, the first coil, the second coil, the first coil, the second coil, the first coil, and the second coil. A second coil and the magnetic field generating means are respectively arranged, and the lens is moved in the first direction and the second direction by utilizing the force generated in the both coils. Optical head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59260073A JPH0664752B2 (en) | 1984-12-11 | 1984-12-11 | Light head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59260073A JPH0664752B2 (en) | 1984-12-11 | 1984-12-11 | Light head |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3349987A Division JP2539567B2 (en) | 1991-12-10 | 1991-12-10 | Optical head |
| JP5297752A Division JP2793114B2 (en) | 1993-11-29 | 1993-11-29 | Light head |
| JP5297751A Division JP2793113B2 (en) | 1993-11-29 | 1993-11-29 | Light head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61139945A JPS61139945A (en) | 1986-06-27 |
| JPH0664752B2 true JPH0664752B2 (en) | 1994-08-22 |
Family
ID=17342925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59260073A Expired - Lifetime JPH0664752B2 (en) | 1984-12-11 | 1984-12-11 | Light head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0664752B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0229934A (en) * | 1988-07-18 | 1990-01-31 | Toshiba Corp | Objective lens driving device |
| US5199702A (en) * | 1992-03-26 | 1993-04-06 | Xerox Corporation | Sheet transport apparatus |
| US5724337A (en) * | 1993-10-29 | 1998-03-03 | Tdk Corporation | Optical pickup with a compact design |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59160835A (en) * | 1983-12-23 | 1984-09-11 | Olympus Optical Co Ltd | Driving device for projection lens |
| JPH0333936Y2 (en) * | 1984-11-30 | 1991-07-18 |
-
1984
- 1984-12-11 JP JP59260073A patent/JPH0664752B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61139945A (en) | 1986-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4679904A (en) | Lens driving device for an optical pickup unit with simplified construction | |
| JP2684738B2 (en) | Objective lens drive | |
| JPH03104027A (en) | Objective lens driver | |
| JPH08212573A (en) | Driving gear of objective lens of optical pickup | |
| JPH0991723A (en) | Optical head device | |
| JPH0664752B2 (en) | Light head | |
| JP2915891B2 (en) | Light head | |
| JP2539567B2 (en) | Optical head | |
| JPH0110754Y2 (en) | ||
| JP2793113B2 (en) | Light head | |
| JPH06295454A (en) | Optical head | |
| JP2601791B2 (en) | Lens drive | |
| JP3080303B2 (en) | Information reading device | |
| JPH0728581Y2 (en) | Optical head | |
| JPS61296536A (en) | Optical system supporting device | |
| JPH0244337Y2 (en) | ||
| JP2793126B2 (en) | Lens drive | |
| JPH0237129Y2 (en) | ||
| JP3268809B2 (en) | Optical system drive | |
| JP2793127B2 (en) | Lens drive | |
| JPH0426976Y2 (en) | ||
| JPS61139949A (en) | Optical head | |
| JPS61139946A (en) | Optical head | |
| JPH05166212A (en) | Objective lens driving device | |
| JPS60234240A (en) | Objective lens driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |