JPH11259877A - Optical pickup - Google Patents

Optical pickup

Info

Publication number
JPH11259877A
JPH11259877A JP10059611A JP5961198A JPH11259877A JP H11259877 A JPH11259877 A JP H11259877A JP 10059611 A JP10059611 A JP 10059611A JP 5961198 A JP5961198 A JP 5961198A JP H11259877 A JPH11259877 A JP H11259877A
Authority
JP
Japan
Prior art keywords
lens holder
yoke
magnet
optical pickup
arm
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
JP10059611A
Other languages
Japanese (ja)
Other versions
JP3532408B2 (en
Inventor
Atsushi Iwanaga
敦 岩永
Tsutomu Takatani
勉 高谷
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP05961198A priority Critical patent/JP3532408B2/en
Priority to KR1019990007546A priority patent/KR19990077684A/en
Publication of JPH11259877A publication Critical patent/JPH11259877A/en
Application granted granted Critical
Publication of JP3532408B2 publication Critical patent/JP3532408B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/22Apparatus or processes for the manufacture of optical heads, e.g. assembly
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition 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
    • G11B7/0925Electromechanical actuators for lens positioning
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537Optical discs
    • G11B2220/2545CDs

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce unnecessary vibration of an MM(moving magnet) optical pickup by increasing the strength of adhesion between a lens holder and a yoke. SOLUTION: On the back surface of the lens holder 1 made of synthetic resin, a couple of guide grooves 14 are formed extending vertically and step parts 15 are formed on the bottom surfaces of those guide grooves 14. A magnet 5 is fixed to one internal wall surface 3a between the opposite internal wall surfaces 3a and 3b of the yoke 3 and an arm part 12 which projects to the right and left from both flanks of the magnet 5 are formed at both side parts of the other internal wall surface 3. Then both arm parts 12 are inserted into the guide grooves 14 from above the lens holder 1 and made to abut against the step parts 15, and the internal wall surface 3b including both arm parts 12 is adhered to the lens holder 1 to fix the yoke 3 to the lens holder 1. A focus coil 9 and tracking coils 10 and 11, on the other hand', are fitted onto a base 7 as a fixed-side member and the join part of those coils is inserted into the gap between the magnet and the opposite internal wall surface 3b of the yoke 3, thereby allowing magnetic flux from the magnet 5 to the inner wall surface 3b cross a current flowing to each coil.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、コンパクトディス
クやミニディスク等の媒体で情報を記録または再生する
光学式ピックアップに係り、特に、レンズホルダ側に磁
気回路が固定されたムービングマグネット(MM)方式
と呼ばれる光学式ピックアップに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup for recording or reproducing information on or from a medium such as a compact disk or a mini disk, and more particularly to a moving magnet (MM) system in which a magnetic circuit is fixed to a lens holder. Optical pickup called.

【0002】[0002]

【従来の技術】光学式ピックアップは、対物レンズを保
持するレンズホルダと、レンズホルダを複数本のワイヤ
を介して支持する固定側部材と、レンズホルダをフォー
カス方向またはトラッキング方向へ駆動する電磁駆動機
構等を備えており、MM方式の光学式ピックアップの場
合は、レンズホルダに固定された磁気回路と固定側部材
に取り付けられたフォーカスコイルおよびトラッキング
コイルとによって電磁駆動機構が構成されている。
2. Description of the Related Art An optical pickup comprises a lens holder for holding an objective lens, a fixed member for supporting the lens holder via a plurality of wires, and an electromagnetic drive mechanism for driving the lens holder in a focusing direction or a tracking direction. In the case of the MM type optical pickup, an electromagnetic drive mechanism is configured by a magnetic circuit fixed to a lens holder and a focus coil and a tracking coil mounted on a fixed side member.

【0003】図5は従来のMM方式の光学式ピックアッ
プの斜視図、図6は該光学式ピックアップに備えられる
電磁駆動機構を示す説明図である。これらの図において
符号1はレンズホルダを示し、このレンズホルダ1は軽
量化を図るために合成樹脂で成形されており、対物レン
ズ2とヨーク3が取り付けられている。ヨーク3は上端
を開放したU字状の磁性体であり、その開放端にトップ
ヨーク4が接合されて閉磁路を形成している。ヨーク3
の相対向する内壁面3a,3bのうち、一方の内壁面3
aにマグネット5が取り付けられており、他方の内壁面
3bはレンズホルダ1の背面に接着剤を用いて固定され
ている。ヨーク3とトップヨーク4およびマグネット5
によって磁気回路が構成されており、この磁気回路を含
むレンズホルダ1側の構成部品は可動部をなし、レンズ
ホルダ1を4本のワイヤ6を介してベース7の起立部7
aに取り付けることにより、可動部は固定側部材である
ベース7の起立部7aに弾性的に支持されている。
FIG. 5 is a perspective view of a conventional MM type optical pickup, and FIG. 6 is an explanatory view showing an electromagnetic drive mechanism provided in the optical pickup. In these figures, reference numeral 1 denotes a lens holder. The lens holder 1 is formed of a synthetic resin in order to reduce the weight, and an objective lens 2 and a yoke 3 are attached. The yoke 3 is a U-shaped magnetic body having an open upper end, and a top yoke 4 is joined to the open end to form a closed magnetic path. York 3
Of the inner wall surfaces 3a and 3b facing each other,
The magnet 5 is attached to a, and the other inner wall surface 3b is fixed to the back surface of the lens holder 1 using an adhesive. Yoke 3, top yoke 4, and magnet 5
A component on the lens holder 1 side including the magnetic circuit constitutes a movable portion, and the lens holder 1 is connected to the upright portion 7 of the base 7 via four wires 6.
By attaching the movable portion to the movable portion a, the movable portion is elastically supported by the upright portion 7a of the base 7, which is a fixed-side member.

【0004】ベース7上にボビン8を介してフォーカス
コイル9が取り付けられており、このフォーカスコイル
9は対物レンズ2の光軸と直交する方向に枠状に巻回さ
れている。フォーカスコイル9の一部に一対のトラッキ
ングコイル10,11が接着されており、両トラッキン
グコイル10,11は相互に逆向きに巻回されてフォー
カスコイル9と直交する方向に並設されており、隣接す
る有効部分10a,11aに同方向の電流が流れるよう
に結線されている。フォーカスコイル9および両トラッ
キングコイル10,11の接合部分はマグネット5とこ
れに対向するヨーク3の内壁面3b間のギャップ内に挿
入され、マグネット5から内壁面3bに向かう磁束、す
なわち図5に示す座標軸のY方向の磁束が各コイル9,
10,11に流れる電流と交差するようになっている。
したがって、フォーカスコイル9に流れる電流によって
座標軸のZ方向の力が働き、レンズホルダ1は対物レン
ズ2のフォーカス方向、すなわちZ方向に動く。同様に
して、両トラッキングコイル10,11に流れる電流に
よっても座標軸のX方向の力が働き、レンズホルダ1は
対物レンズ2のトラッキング方向に動かされる。
[0004] A focus coil 9 is mounted on a base 7 via a bobbin 8, and the focus coil 9 is wound in a frame shape in a direction orthogonal to the optical axis of the objective lens 2. A pair of tracking coils 10 and 11 are adhered to a part of the focus coil 9, and the two tracking coils 10 and 11 are wound in opposite directions and are arranged side by side in a direction orthogonal to the focus coil 9. The wires are connected so that currents in the same direction flow in adjacent effective portions 10a and 11a. The joint between the focus coil 9 and the tracking coils 10 and 11 is inserted into the gap between the magnet 5 and the inner wall surface 3b of the yoke 3 opposed thereto, and the magnetic flux from the magnet 5 toward the inner wall surface 3b, ie, shown in FIG. The magnetic flux in the Y direction of the coordinate axis is
It intersects with the current flowing through 10 and 11.
Therefore, a force in the Z direction of the coordinate axis acts due to the current flowing through the focus coil 9, and the lens holder 1 moves in the focus direction of the objective lens 2, that is, the Z direction. Similarly, a force in the X direction of the coordinate axis also acts on the current flowing through the tracking coils 10 and 11, and the lens holder 1 is moved in the tracking direction of the objective lens 2.

【0005】[0005]

【発明が解決しようとする課題】ところで、前述した従
来のMM方式の光学式ピックアップでは、ヨーク3に幅
寸法が同一で相対向する一対の内壁面3a,3bを形成
し、一方の内壁面3aに固着したマグネット5から他方
の内壁面3bに向かう磁束がフォーカスコイル9および
両トラッキングコイル10,11に流れる電流と交差す
るように構成されており、ヨーク3の内壁面3a,3b
とマグネット5とはほぼ同一の幅寸法に設定されてい
る。このため、図6に示すように、レンズホルダ1に接
着される内壁面3bの幅寸法L1がフォーカスコイル9
の内径寸法L2よりも小さくなり、レンズホルダ1に対
するヨーク3の接着強度を高めることができず、ヨーク
3がレンズホルダ1から剥離しやすいという問題があ
る。
In the above-mentioned conventional optical pickup of the MM system, a pair of inner walls 3a and 3b having the same width and facing each other are formed on the yoke 3, and one of the inner walls 3a is formed. The magnetic flux from the magnet 5 fixed to the inner surface of the yoke 3 crosses the current flowing through the focus coil 9 and the tracking coils 10 and 11, and the inner wall surfaces 3 a and 3 b of the yoke 3.
And the magnet 5 have substantially the same width. For this reason, as shown in FIG. 6, the width L1 of the inner wall surface 3b adhered to the lens holder 1 is
Is smaller than the inner diameter dimension L2 of the lens holder 1, the adhesive strength of the yoke 3 to the lens holder 1 cannot be increased, and there is a problem that the yoke 3 is easily separated from the lens holder 1.

【0006】また、レンズホルダ1のトラッキング方向
への移動を許容する関係上、ワイヤ6を各コイル9,1
0,11から所定距離だけ離した状態でレンズホルダ1
に連結する必要があるが、上記したように内壁面3bの
幅寸法L1が短いため、ワイヤ6の連結部から内壁面3
bの端部に至る寸法L3は必然的に長くなる。ここで、
レンズホルダ1は合成樹脂で成形されて軽量化が図られ
ているため、ワイヤ6の連結部から内壁面3bの端部間
に介在する成形体は剛性が低く、不要振動を誘発すると
いう問題もある。
In order to allow the lens holder 1 to move in the tracking direction, the wire 6 is connected to each of the coils 9, 1.
The lens holder 1 is separated from the lens holders 0 and 11 by a predetermined distance.
However, since the width L1 of the inner wall surface 3b is short as described above, the inner wall 3
The dimension L3 reaching the end of b is inevitably long. here,
Since the lens holder 1 is molded from a synthetic resin to reduce the weight, the molded body interposed between the connecting portion of the wire 6 and the end of the inner wall surface 3b has low rigidity, and also causes unnecessary vibration. is there.

【0007】[0007]

【課題を解決するための手段】本発明は、ヨークにマグ
ネットの幅方向に沿う端面よりも外側へ突出する腕部を
形成し、この腕部を利用してヨークをレンズホルダに接
着することとする。このような腕部をヨークに形成する
と、コイルに作用する磁束を劣化させることなく、レン
ズホルダに対するヨークの接着面積が十分に確保される
ため、レンズホルダとヨークの接着強度を高めることが
できる。また、ヨークをレンズホルダに接着した状態で
腕部がワイヤの連結部に近づき、この腕部を含むヨーク
は合成樹脂に比べて剛性が高い金属材料(磁性体)で形
成されているため、レンズホルダの変形に起因する不要
振動を低減することができる。
According to the present invention, an arm is formed on a yoke to protrude outward from an end face along a width direction of a magnet, and the yoke is bonded to a lens holder using the arm. I do. When such an arm is formed in the yoke, the adhesive area of the yoke to the lens holder is sufficiently secured without deteriorating the magnetic flux acting on the coil, so that the adhesive strength between the lens holder and the yoke can be increased. Further, the arm approaches the connecting portion of the wire with the yoke adhered to the lens holder, and the yoke including the arm is formed of a metal material (magnetic material) having higher rigidity than synthetic resin. Unnecessary vibration caused by deformation of the holder can be reduced.

【0008】[0008]

【発明の実施の形態】本発明の光学式ピックアップで
は、対物レンズを保持する合成樹脂製のレンズホルダ
と、このレンズホルダを弾性的に支持する固定側部材
と、この固定側部材に取り付けられたコイルと、前記レ
ンズホルダに接着されたヨークと、このヨークに固定さ
れ、前記コイルに流れる電流の方向と交差する方向に磁
束を発生するマグネットとを備えた光学式ピックアップ
において、前記ヨークの前記レンズホルダとの接触面に
腕部を形成し、この腕部を前記マグネットの幅方向に沿
う端面よりも外側へ突出させた。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In an optical pickup according to the present invention, a synthetic resin lens holder for holding an objective lens, a fixed member for elastically supporting the lens holder, and a fixed member attached to the fixed member. An optical pickup, comprising: a coil; a yoke adhered to the lens holder; and a magnet fixed to the yoke and generating a magnetic flux in a direction intersecting a direction of a current flowing through the coil. An arm portion was formed on the contact surface with the holder, and the arm portion was protruded outward from an end surface along the width direction of the magnet.

【0009】前記コイルとしてフォーカスコイルとトラ
ッキングコイルの両方を備えていることが好適である
が、例えば、トラッキング方向への移動を別の駆動手段
を用いて行なう場合は、フォーカスコイルのみであって
も良い。
It is preferable that both the focus coil and the tracking coil are provided as the coil. For example, when the movement in the tracking direction is performed using another driving means, even if only the focus coil is used. good.

【0010】また、前記腕部を前記マグネットの中心軸
に対して両側へ突出形成すると、前記コイルに作用する
磁場の均一性を確保することができる。
Further, when the arm portion is formed so as to protrude to both sides with respect to the center axis of the magnet, uniformity of the magnetic field acting on the coil can be ensured.

【0011】また、前記腕部に小孔を設けると、その分
だけヨークを軽量化することができると共に、マグネッ
トから腕部に向かう漏洩磁束を低減することができる。
When the small hole is provided in the arm, the yoke can be lightened by that much, and the leakage magnetic flux from the magnet toward the arm can be reduced.

【0012】また、前記レンズホルダに前記腕部が挿入
されるガイド溝を設けると、ガイド溝によって腕部の剥
離方向の動きが規制されるため、レンズホルダとヨーク
の接着強度を一層高めることができる。
Further, if a guide groove into which the arm is inserted is provided in the lens holder, the movement of the arm in the peeling direction is regulated by the guide groove, so that the adhesive strength between the lens holder and the yoke can be further increased. it can.

【0013】また、前記ガイド溝に前記腕部の挿入量を
規定する段部を設けると、段部によってレンズホルダと
ヨークの位置精度が自動的に決定されるため、組立作業
性を簡略化することができる。
When a step defining the insertion amount of the arm is provided in the guide groove, the positional accuracy of the lens holder and the yoke is automatically determined by the step, thereby simplifying assembly workability. be able to.

【0014】[0014]

【実施例】実施例について図面を参照して説明すると、
図1は実施例に係る光学式ピックアップの平面図、図2
は該光学式ピックアップの斜視図、図3は該光学式ピッ
クアップに備えられる可動部の斜視図、図4は該可動部
の分解斜視図であり、図5と図6に対応する部分には同
一符号を付してある。
Embodiments will be described with reference to the drawings.
FIG. 1 is a plan view of an optical pickup according to an embodiment, and FIG.
FIG. 3 is a perspective view of the optical pickup, FIG. 3 is a perspective view of a movable portion provided in the optical pickup, and FIG. 4 is an exploded perspective view of the movable portion, and portions corresponding to FIGS. 5 and 6 are the same. The code is attached.

【0015】実施例に係る光学式ピックアップが前述し
た従来例と相違する点は、レンズホルダ1とヨーク3の
接着部分の構成にあり、それ以外の構成は基本的に同様
である。すなわち、図1と図2に示すように、合成樹脂
製のレンズホルダ1には対物レンズ2が取り付けられて
おり、後述するように、このレンズホルダ1の背面にヨ
ーク3が接着固定されている。レンズホルダ1の両側部
に4つの連結部1aが形成されており、4本のワイヤ6
の各両端をこれら連結部1aとベース7の起立部7aに
それぞれ接着することにより、磁気回路を含むレンズホ
ルダ1側の可動部は固定側部材であるベース7の起立部
7aに弾性的に支持されている。このベース7上にはボ
ビン8を介してフォーカスコイル9が取り付けられてお
り、フォーカスコイル9は対物レンズ2の光軸と直交す
る方向に枠状に巻回されている。フォーカスコイル9の
一部に一対のトラッキングコイル10,11が接着され
ており、両トラッキングコイル10,11は相互に逆向
きに巻回されてフォーカスコイル9と直交する方向に並
設されており、隣接する有効部分に同方向の電流が流れ
るように結線されている。フォーカスコイル9および両
トラッキングコイル10,11の接合部分はマグネット
5とこれに対向するヨーク3の内壁面3b間のギャップ
内に挿入され、マグネット5から内壁面3bに向かう磁
束が各コイル9,10,11に流れる電流と交差するよ
うになっており、ヨーク3の開放端にはトップヨーク4
が接合されている。
The optical pickup according to the embodiment differs from the above-described conventional example in the structure of the bonding portion between the lens holder 1 and the yoke 3, and the other structures are basically the same. That is, as shown in FIGS. 1 and 2, an objective lens 2 is attached to a lens holder 1 made of synthetic resin, and a yoke 3 is adhered and fixed to the back of the lens holder 1 as described later. . Four connecting portions 1 a are formed on both sides of the lens holder 1, and four wires 6
The movable portion of the lens holder 1 side including the magnetic circuit is elastically supported by the upright portion 7a of the base 7 which is a fixed side member by adhering both ends of the base member to the connecting portion 1a and the upright portion 7a of the base 7, respectively. Have been. A focus coil 9 is mounted on the base 7 via a bobbin 8, and the focus coil 9 is wound in a frame shape in a direction orthogonal to the optical axis of the objective lens 2. A pair of tracking coils 10 and 11 are adhered to a part of the focus coil 9, and the two tracking coils 10 and 11 are wound in opposite directions and are arranged side by side in a direction orthogonal to the focus coil 9. The wires are connected so that current flows in the same direction in adjacent effective portions. The joint between the focus coil 9 and the tracking coils 10 and 11 is inserted into the gap between the magnet 5 and the inner wall surface 3b of the yoke 3 opposed thereto, and the magnetic flux from the magnet 5 toward the inner wall surface 3b is applied to each of the coils 9, 10 , 11 and the top yoke 4 is connected to the open end of the yoke 3.
Are joined.

【0016】図4に示すように、ヨーク3の相対向する
内壁面3a,3bのうち、レンズホルダ1に接着される
方の内壁面3bの両側部に腕部12が形成されており、
これら腕部12には小孔13が穿設されている。両腕部
12は内壁面3aに取り付けられたマグネット5の中心
軸に対して左右方向に均一に突出しており、両腕部12
を除く内壁面3bの幅寸法とマグネット5の幅寸法はほ
ぼ同じに設定されている。一方、合成樹脂製のレンズホ
ルダ1の背面には上下方向に延びる一対のガイド溝14
が形成されており、これらガイド溝14とワイヤ6の各
連結部1aとは近接した位置にある。両ガイド溝14の
上端は開放されているが、その底面には段部15が形成
されている。
As shown in FIG. 4, arms 12 are formed on both sides of the inner wall surface 3b of the yoke 3 which is bonded to the lens holder 1 among the inner wall surfaces 3a and 3b facing each other.
Small holes 13 are formed in these arms 12. Both arms 12 project uniformly in the left-right direction with respect to the center axis of the magnet 5 attached to the inner wall surface 3a.
The width dimension of the inner wall surface 3b except for the width dimension of the magnet 5 is set to be substantially the same. On the other hand, a pair of guide grooves 14 extending in the vertical direction is provided on the back of the lens holder 1 made of synthetic resin.
Are formed, and the guide groove 14 and each connecting portion 1a of the wire 6 are located at positions close to each other. The upper ends of both guide grooves 14 are open, but a step 15 is formed on the bottom surface.

【0017】図3に示すように、ヨーク3はレンズホル
ダ1の背面に接着剤を用いて固定されるが、その際、両
腕部12をレンズホルダ1の上方からガイド溝14内に
挿入して段部15に突き当てると、両腕部12はガイド
溝14によってレンズホルダ1の左右方向に位置決めさ
れると共に、段部15によってレンズホルダの上下方向
にも位置決めされるため、ヨーク3とレンズホルダ1間
の相対位置を簡単かつ高精度に維持することができる。
また、内壁面3bに両腕部12を形成した分だけレンズ
ホルダ1に対するヨーク3の接着面積が広がり、しか
も、両腕部12はガイド溝14によって剥離方向の動き
が規制されるため、レンズホルダ1とヨーク3の接着強
度を非常に高めることができる。さらに、ヨーク3の腕
部12をワイヤ6の連結部1aに近づけられるため、ヨ
ーク3から連結部1aに至る間に剛性の低い成形体はほ
とんど存在せず、レンズホルダ1の変形に起因する不要
振動を低減することができる。さらにまた、両腕部12
はマグネット5の中心軸に対して左右方向へ突出してい
るため、各コイル9,10,11に作用する磁場の均一
性を確保することができ、しかも、腕部12に小孔13
が穿設されているため、その分だけヨーク3を軽量化す
ることができると共に、マグネット5から腕部12に向
かう漏洩磁束を低減することができる。
As shown in FIG. 3, the yoke 3 is fixed to the back surface of the lens holder 1 using an adhesive. At this time, the arms 12 are inserted into the guide grooves 14 from above the lens holder 1. When the arm 12 is brought into contact with the step 15, the arms 12 are positioned in the left and right directions of the lens holder 1 by the guide grooves 14, and are also positioned in the vertical direction of the lens holder by the steps 15. The relative position between the holders 1 can be easily and accurately maintained.
In addition, the bonding area of the yoke 3 to the lens holder 1 is increased by the amount of the two arms 12 formed on the inner wall surface 3b, and the movement of the two arms 12 in the peeling direction is regulated by the guide grooves 14. The adhesive strength between the first and yoke 3 can be greatly increased. Further, since the arm portion 12 of the yoke 3 can be brought close to the connecting portion 1a of the wire 6, there is almost no molded body having low rigidity from the yoke 3 to the connecting portion 1a. Vibration can be reduced. Furthermore, both arms 12
Projecting in the left-right direction with respect to the center axis of the magnet 5, uniformity of the magnetic field acting on each of the coils 9, 10, 11 can be ensured.
The yoke 3 can be reduced in weight by that amount, and the leakage magnetic flux from the magnet 5 to the arm 12 can be reduced.

【0018】[0018]

【発明の効果】本発明は、以上説明したような形態で実
施され、以下に記載されるような効果を奏する。
The present invention is embodied in the form described above and has the following effects.

【0019】MM方式の光学式ピックアップにおいて、
ヨークにマグネットの幅方向に沿う端面よりも外側へ突
出する腕部を形成し、この腕部を利用してヨークをレン
ズホルダに接着すると、コイルに作用する磁束を劣化さ
せることなく、レンズホルダとヨークの接着強度を高め
ることができ、しかも、ヨークをレンズホルダに接着し
た状態で腕部をワイヤの連結部に近づけられるため、レ
ンズホルダの変形に起因する不要振動を低減することが
できる。
In the optical pickup of the MM system,
By forming an arm on the yoke that protrudes outward from the end face along the width direction of the magnet, and using this arm to adhere the yoke to the lens holder, the magnetic flux acting on the coil is not deteriorated, Since the bonding strength of the yoke can be increased, and the arm can be brought close to the connecting portion of the wire with the yoke bonded to the lens holder, unnecessary vibration due to deformation of the lens holder can be reduced.

【0020】また、前記腕部を前記マグネットの中心軸
に対して両側へ突出形成すると、前記コイルに作用する
磁場の均一性を確保することができる。
Further, when the arm portion is formed so as to protrude to both sides with respect to the center axis of the magnet, uniformity of the magnetic field acting on the coil can be ensured.

【0021】また、前記腕部に小孔を設けると、その分
だけヨークを軽量化することができると共に、マグネッ
トから腕部に向かう漏洩磁束を低減することができる。
Further, when the small hole is provided in the arm portion, the weight of the yoke can be reduced correspondingly, and the leakage magnetic flux from the magnet toward the arm portion can be reduced.

【0022】また、前記レンズホルダに前記腕部が挿入
されるガイド溝を設けると、ガイド溝によって腕部の剥
離方向の動きが規制されるため、レンズホルダとヨーク
の接着強度を一層高めることができる。
If the lens holder is provided with a guide groove in which the arm is inserted, the movement of the arm in the peeling direction is regulated by the guide groove, so that the adhesive strength between the lens holder and the yoke can be further increased. it can.

【0023】また、前記ガイド溝に前記腕部の挿入量を
規定する段部を設けると、段部によってレンズホルダと
ヨークの位置精度が自動的に決定されるため、組立作業
性を簡略化することができる。
If a step is provided in the guide groove to define the insertion amount of the arm, the positional accuracy of the lens holder and the yoke is automatically determined by the step, thereby simplifying the assembly workability. be able to.

【図面の簡単な説明】[Brief description of the drawings]

【図1】実施例に係る光学式ピックアップの平面図であ
る。
FIG. 1 is a plan view of an optical pickup according to an embodiment.

【図2】該光学式ピックアップの斜視図である。FIG. 2 is a perspective view of the optical pickup.

【図3】該光学式ピックアップに備えられる可動部の斜
視図である。
FIG. 3 is a perspective view of a movable section provided in the optical pickup.

【図4】該可動部の分解斜視図である。FIG. 4 is an exploded perspective view of the movable portion.

【図5】従来の光学式ピックアップの斜視図である。FIG. 5 is a perspective view of a conventional optical pickup.

【図6】該光学式ピックアップに備えられる電磁駆動機
構を示す説明図である。
FIG. 6 is an explanatory diagram showing an electromagnetic drive mechanism provided in the optical pickup.

【符号の説明】[Explanation of symbols]

1 レンズホルダ 1a 連結部 2 対物レンズ 3 ヨーク 3a,3b 内壁面 4 トップヨーク 5 マグネット 6 ワイヤ 7 ベース 7a 起立部 9 フォーカスコイル 10,11 トラッキングコイル 12 腕部 13 小孔 14 ガイド 15 段部 1 Lens holder 1a Connecting part 2 Objective lens 3 Yoke 3a, 3b Inner wall surface 4 Top yoke 5 Magnet 6 Wire 7 Base 7a Standing part 9 Focus coil 10, 11 Tracking coil 12 Arm part 13 Small hole 14 Guide 15 Step part

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 対物レンズを保持する合成樹脂製のレン
ズホルダと、このレンズホルダを弾性的に支持する固定
側部材と、この固定側部材に取り付けられたコイルと、
前記レンズホルダに接着されたヨークと、このヨークに
固定され、前記コイルに流れる電流の方向と交差する方
向に磁束を発生するマグネットとを備えた光学式ピック
アップにおいて、 前記ヨークの前記レンズホルダとの接触面に腕部を形成
し、この腕部を前記マグネットの幅方向に沿う端面より
も外側へ突出させたことを特徴とする光学式ピックアッ
プ。
1. A lens holder made of a synthetic resin for holding an objective lens, a fixed side member for elastically supporting the lens holder, a coil attached to the fixed side member,
An optical pickup comprising: a yoke bonded to the lens holder; and a magnet fixed to the yoke and generating a magnetic flux in a direction intersecting a direction of a current flowing through the coil. An optical pickup, wherein an arm portion is formed on a contact surface, and the arm portion is protruded outward from an end surface along a width direction of the magnet.
【請求項2】 前記腕部を前記マグネットの中心軸に対
して両側へ突出形成したことを特徴とする請求項1に記
載の光学式ピックアップ。
2. The optical pickup according to claim 1, wherein said arm portion is formed so as to project to both sides with respect to a center axis of said magnet.
【請求項3】 前記腕部に小孔を設けたことことを特徴
とする請求項1または2に記載の光学式ピックアップ。
3. The optical pickup according to claim 1, wherein a small hole is provided in said arm portion.
【請求項4】 前記レンズホルダに前記腕部が挿入され
るガイド溝を設けたことを特徴とする請求項1〜3のい
ずれかに記載の光学式ピックアップ。
4. The optical pickup according to claim 1, wherein a guide groove into which the arm is inserted is provided in the lens holder.
【請求項5】 前記ガイド溝に前記腕部の挿入量を規定
する段部を設けたことを特徴とする請求項4に記載の光
学式ピックアップ。
5. The optical pickup according to claim 4, wherein a step portion for defining an insertion amount of the arm portion is provided in the guide groove.
JP05961198A 1998-03-11 1998-03-11 Optical pickup Expired - Fee Related JP3532408B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP05961198A JP3532408B2 (en) 1998-03-11 1998-03-11 Optical pickup
KR1019990007546A KR19990077684A (en) 1998-03-11 1999-03-08 Optical pick-up

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP05961198A JP3532408B2 (en) 1998-03-11 1998-03-11 Optical pickup

Publications (2)

Publication Number Publication Date
JPH11259877A true JPH11259877A (en) 1999-09-24
JP3532408B2 JP3532408B2 (en) 2004-05-31

Family

ID=13118229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP05961198A Expired - Fee Related JP3532408B2 (en) 1998-03-11 1998-03-11 Optical pickup

Country Status (2)

Country Link
JP (1) JP3532408B2 (en)
KR (1) KR19990077684A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100713543B1 (en) 2003-12-29 2007-05-02 엘지전자 주식회사 Optical Pick-up actuator
US7272840B2 (en) 2002-08-24 2007-09-18 Samsung Electronics Co., Ltd. Objective lens driving apparatus used with an optical pickup
JP2011018428A (en) * 2008-08-21 2011-01-27 Sanyo Electric Co Ltd Mounting structure of magnetic member, bonding method of magnetic member and magnetic coupling member, pickup apparatus, and disk apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7272840B2 (en) 2002-08-24 2007-09-18 Samsung Electronics Co., Ltd. Objective lens driving apparatus used with an optical pickup
KR100713543B1 (en) 2003-12-29 2007-05-02 엘지전자 주식회사 Optical Pick-up actuator
CN100372003C (en) * 2003-12-29 2008-02-27 Lg电子株式会社 Optical pick-up actuator
JP2011018428A (en) * 2008-08-21 2011-01-27 Sanyo Electric Co Ltd Mounting structure of magnetic member, bonding method of magnetic member and magnetic coupling member, pickup apparatus, and disk apparatus

Also Published As

Publication number Publication date
KR19990077684A (en) 1999-10-25
JP3532408B2 (en) 2004-05-31

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