JPH08235596A - Optical head driving mechanism - Google Patents
Optical head driving mechanismInfo
- Publication number
- JPH08235596A JPH08235596A JP3636795A JP3636795A JPH08235596A JP H08235596 A JPH08235596 A JP H08235596A JP 3636795 A JP3636795 A JP 3636795A JP 3636795 A JP3636795 A JP 3636795A JP H08235596 A JPH08235596 A JP H08235596A
- Authority
- JP
- Japan
- Prior art keywords
- yoke
- sheet metal
- optical head
- information recording
- optical information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Moving Of Heads (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ヘッド駆動機構、よ
り詳細には、リニアモータを利用した光情報記録再生装
置における光ヘッド駆動機構に関し、例えば、光ディス
クドライブ装置の光ヘッド駆動機構に適用されるもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head drive mechanism, and more particularly to an optical head drive mechanism in an optical information recording / reproducing apparatus using a linear motor, and is applied to, for example, an optical head drive mechanism of an optical disk drive device. It is what is done.
【０００２】[0002]
【従来技術】図１３は、従来の光情報記録再生装置の例
を説明するための要部斜視図で（特開平６−４４５８２
号公報参照）、この光情報記録再生装置は、円盤状光情
報記録媒体３０に対し、情報を記録、再生若しくは消去
する光ヘッド３１と、該光ヘッド３１を支持し該光ヘッ
ド３１をその移動方向（ｘ方向）に案内するガイドシャ
フト３２と、前記光ヘッド３１に固定されると共にその
巻回中心軸が該光ヘッド３１の移動方向に対して平行に
配置された駆動コイル３３と、該駆動コイル３３に該駆
動コイル３３の移動方向に対し直角な方向の磁場を与え
る磁気回路３４とを有し、この磁気回路３４は、前記駆
動コイル３３の外側面（若しくは内側面）に対し一定の
空隙を有しかつ該駆動コイル３３の移動方向に対し平行
に配置された永久磁石３５と、該永久磁石３５の一方の
磁極が固定される第１のヨーク３６と、前記永久磁石３
５の他方の磁極と対向して前記駆動コイル３３に磁場を
与える磁気ギャップ４０を形成すると共に、前記第１の
ヨーク３６の前記駆動コイル３３の移動方向両端で前記
第１のヨーク３６と連結される第２のヨーク３７とから
構成されている。更に、上述のごとく構成された光ヘッ
ド駆動機構は、ベース部材３８に取り付けられるが、こ
の取り付けは、ベース部材３８に孔を設けるとともに、
前記第１のヨーク３６の厚み方向（ｙ方向）に締結孔を
設け、これらの孔を通して締結手段３９をｙ方向より挿
入し、第１のヨーク３６を前記ベース部材３８に締結固
定するようにしている。2. Description of the Related Art FIG. 13 is a perspective view of an essential part for explaining an example of a conventional optical information recording / reproducing apparatus (Japanese Patent Laid-Open No. 6-44582).
This optical information recording / reproducing apparatus includes an optical head 31 for recording, reproducing or erasing information on a disc-shaped optical information recording medium 30, and an optical head 31 which supports the optical head 31 and moves the optical head 31. Direction (x direction), a guide shaft 32, a drive coil 33 fixed to the optical head 31 and having a winding center axis arranged parallel to the moving direction of the optical head 31, The coil 33 has a magnetic circuit 34 for applying a magnetic field in a direction perpendicular to the moving direction of the drive coil 33, and the magnetic circuit 34 has a constant gap with respect to the outer surface (or inner surface) of the drive coil 33. And a first magnet 36 to which one magnetic pole of the permanent magnet 35 is fixed, and the permanent magnet 3
A magnetic gap 40 for giving a magnetic field to the drive coil 33 is formed so as to face the other magnetic pole of No. 5, and both ends of the first yoke 36 in the moving direction of the drive coil 33 are connected to the first yoke 36. And a second yoke 37. Further, the optical head drive mechanism configured as described above is attached to the base member 38. This attachment provides a hole in the base member 38 and
Fastening holes are provided in the thickness direction (y direction) of the first yoke 36, and fastening means 39 is inserted from the y direction through these holes to fasten and fix the first yoke 36 to the base member 38. There is.
【０００３】[0003]
【発明が解決しようとする課題】図１３に示した光ヘッ
ド駆動機構においては、リニアモータを構成する磁気回
路３４の第１のヨーク３６が、板金部材にて光情報記録
媒体３０に対し垂直に形成されており、該板金部材に設
けた締結孔を介して第１のヨーク３６をベース部材３８
に固定するようにしている。従って、磁気回路３４を薄
型化する（ｚ方向に小型化する）場合、前記締結孔の直
径よりも薄くすることは不可能であり、実際には、前記
締結孔の周囲の肉厚を充分に確保しないと剛性上問題が
発生するため、前記締結孔の直径と充分な周囲の肉厚と
を加えた厚さ以下には出来ない。In the optical head drive mechanism shown in FIG. 13, the first yoke 36 of the magnetic circuit 34 constituting the linear motor is made of a sheet metal member so as to be perpendicular to the optical information recording medium 30. The first yoke 36 is formed through the fastening hole formed in the sheet metal member and the base member 38.
It is fixed to. Therefore, when making the magnetic circuit 34 thinner (smaller in the z direction), it is impossible to make it thinner than the diameter of the fastening hole, and in reality, the wall thickness around the fastening hole is sufficient. If it is not secured, problems will occur in terms of rigidity, so it cannot be less than the total thickness of the diameter of the fastening hole and a sufficient peripheral wall thickness.
【０００４】また、磁気回路３４を薄型化する場合、薄
型化によるリニアモータの推進力の低下を補うようにす
るために、磁気回路３４の断面積を十分に確保するか、
あるいは、従来に比べ強力な永久磁石３５を使用する必
要がある。図１３に示した従来技術では、磁気回路３４
の断面積を確保するために、複数の板金部材をその厚み
方向（ｙ方向）に重ねて磁気回路３４を形成し、積層方
向（ｙ方向）の板金部材表面に永久磁石３５を取り付け
るようにしている。なお、永久磁石３５を取り付けた面
の反対側の面は、ベース部材３８に面している、つま
り、ベース部材３８と永久磁石３５との間に複数の板金
部材が介在することとなり、板金部材の厚み精度が変動
すると、ベース部材３８に対する永久磁石３５の位置が
大きく変動し、それに伴い、永久磁石３５と駆動コイル
３３との位置関係を正確に規定出来ない。そのため、永
久磁石３５と駆動コイル３３の干渉を防止するのに、磁
気ギャップ４０を大きくとる必要がある。また、駆動コ
イル３３内に挿入される第２のヨーク３７も複数の板金
部材で形成しているため、第２のヨーク３７の板金厚み
方向（ｙ方向）の寸法も正確に規定出来ない。そのた
め、磁気回路３４と駆動コイル３３との干渉を防止する
のに、磁気ギャップ４０を大きくとる必要が生じ、これ
らのため、リニアモータの推力の向上が困難になるとと
もに小型化、薄型化の障害となる。In the case where the magnetic circuit 34 is made thin, is it necessary to secure a sufficient cross-sectional area of the magnetic circuit 34 in order to compensate for the reduction in the propulsive force of the linear motor due to the reduction in thickness?
Alternatively, it is necessary to use the permanent magnet 35 which is stronger than the conventional one. In the prior art shown in FIG. 13, the magnetic circuit 34
In order to secure the cross-sectional area of the sheet metal member, the plurality of sheet metal members are stacked in the thickness direction (y direction) to form the magnetic circuit 34, and the permanent magnet 35 is attached to the surface of the sheet metal member in the stacking direction (y direction). There is. The surface opposite to the surface on which the permanent magnet 35 is attached faces the base member 38, that is, a plurality of sheet metal members are interposed between the base member 38 and the permanent magnet 35, and the sheet metal member is formed. If the thickness accuracy of the permanent magnet 35 fluctuates, the position of the permanent magnet 35 with respect to the base member 38 greatly fluctuates, and accordingly, the positional relationship between the permanent magnet 35 and the drive coil 33 cannot be accurately defined. Therefore, in order to prevent interference between the permanent magnet 35 and the drive coil 33, it is necessary to make the magnetic gap 40 large. Further, since the second yoke 37 inserted into the drive coil 33 is also formed of a plurality of sheet metal members, the dimension of the second yoke 37 in the sheet metal thickness direction (y direction) cannot be accurately defined. Therefore, in order to prevent the interference between the magnetic circuit 34 and the drive coil 33, it is necessary to make the magnetic gap 40 large, which makes it difficult to improve the thrust of the linear motor and obstructs miniaturization and thinning. Becomes
【０００５】また、図１３に示した光ヘッド駆動機構に
おいては、永久磁石３５が固定される第１のヨーク３６
に形成した凹部３６ａと、永久磁石３５と対向し磁気ギ
ャップ４０を形成する第２のヨーク３７に形成した凸部
３７ａとを嵌合して第１のヨーク３６と第２のヨーク３
７とを連結しているが、磁気回路３４を薄型化した場
合、このような凹部３６ａ及び凸部３７ａの形成は困難
になり、第１のヨーク３６に対する第２のヨーク３７の
位置精度、とくに光ヘッド移動方向の軸まわりの傾きの
精度が悪化する。このため、第１のヨーク３６に設けら
れた永久磁石３５と第２のヨーク３７に巻回してある駆
動コイル３３との干渉を防止するには、磁気ギャップ４
０を大きくとる必要が生じ、リニアモータの推力の向上
が困難となるとともに、小型化、薄型化の障害となる。
本発明は、上述のごとき実情に鑑みてなされたもので、
ベース部材（以下フレーム部材）に対する磁気回路の固
定を簡単なものにし、かつ、薄型化、高信頼性化が可能
な光ヘッド駆動機構を提供することを目的としてなされ
たものである。Further, in the optical head drive mechanism shown in FIG. 13, the first yoke 36 to which the permanent magnet 35 is fixed.
The concave portion 36a formed on the first yoke 36 and the second yoke 3 are fitted by fitting the convex portion 37a formed on the second yoke 37 facing the permanent magnet 35 and forming the magnetic gap 40.
However, when the magnetic circuit 34 is made thin, it becomes difficult to form the concave portions 36a and the convex portions 37a, and the positional accuracy of the second yoke 37 with respect to the first yoke 36, especially, The accuracy of inclination around the axis in the moving direction of the optical head deteriorates. Therefore, in order to prevent interference between the permanent magnet 35 provided in the first yoke 36 and the drive coil 33 wound around the second yoke 37, the magnetic gap 4
It becomes necessary to take a large value of 0, which makes it difficult to improve the thrust of the linear motor, and becomes an obstacle to downsizing and thinning.
The present invention has been made in view of the actual situation as described above,
It is an object of the present invention to provide an optical head drive mechanism that can easily fix a magnetic circuit to a base member (hereinafter referred to as a frame member) and can be made thin and highly reliable.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記課題を解
決するために（１）円盤状光情報記録媒体に対し、情報
を記録、再生若しくは消去する光ヘッドと、該光ヘッド
を支持しかつ該光ヘッドをその移動方向に案内するガイ
ドシャフトと、前記光ヘッドに固定されると共にその巻
回中心軸が前記移動方向に対し平行に配置された駆動コ
イルと、該駆動コイルに前記移動方向に対し直角な方向
の磁場を与える磁気回路とを有し、該磁気回路は、前記
駆動コイルの外側面に対し一定の空隙を有し該駆動コイ
ルの移動方向に対し平行に配置された永久磁石と、該永
久磁石の一方の磁極が固定される第１のヨークと、前記
永久磁石の他方の磁極と対向して前記駆動コイルに磁場
を与える磁気ギャップを形成し、前記第１のヨークの前
記光ヘッドの移動方向の両端で前記第１のヨークと連結
される第２のヨークとから構成される光情報記録再生装
置における光ヘッド駆動機構において、前記第１のヨー
クを前記円盤状光情報記録媒体の記録面に対し平行な複
数の板金部材により積層形成し、該複数の板金部材のう
ち少なくとも１枚の板金部材が、他の板金部材と形状の
異なる部分を有し、該形状の異なる部分を光情報記録再
生装置のフレーム部材に固定したことを特徴としたもの
であり、更には、（２）前記（１）において、前記第１
のヨークの前記形状の異なる部分を持たない板金部材
は、前記永久磁石が配置される辺に対向する辺の中央部
近傍に切欠き部を有し、前記第１のヨークの前記形状の
異なる部分を持つ板金部材は、前記切欠き部に相当する
部分に前記形状の異なる部分を有すること、更には、
（３）前記（１）において、前記第１のヨークは、その
両端部に前記第２のヨークと連結するための側ヨークを
一体的に有するコの字型のヨークからなり、そのうちの
前記形状の異なる部分を持たない板金部材は、両端部の
角部に面取り等を有し、残りの前記形状の異なる部分を
持つ板金部材は、前記面取り部に相当する部分に前記形
状の異なる部分を有することを特徴としたものであり、
或いは、（４）円盤状光情報記録媒体に対し、情報を記
録、再生若しくは消去する光ヘッドと、該光ヘッドを支
持しかつ該光ヘッドをその移動方向に案内するガイドシ
ャフトと、前記光ヘッドに固定されると共にその巻回中
心軸が前記移動方向に対し平行に配置された駆動コイル
と、該駆動コイルに前記移動方向に対し直角な方向の磁
場を与える磁気回路とを有し、該磁気回路は、前記駆動
コイルの外側面に対し一定の空隙を有し該駆動コイルの
移動方向に対し平行に配置された永久磁石と、該永久磁
石の一方の磁極が固定される第１のヨークと、前記永久
磁石の他方の磁極と対向して前記駆動コイルに磁場を与
える磁気ギャップを形成し、前記第１のヨークの前記光
ヘッドの移動方向の両端で前記第１のヨークと連結され
る第２のヨークとから構成される光情報記録再生装置に
おける光ヘッド駆動機構において、前記第１のヨークを
前記円盤状光情報記録媒体の記録面に対し平行な複数の
板金部材により積層形成し、該複数の板金部材のうち少
なくとも１枚の板金部材が、他の板金部材と形状の異な
る部分を有し、該形状の異なる部分を前記第２のヨーク
に当接して該第２のヨークの位置を規定したこと、更に
は、（５）前記（４）において、前記第２のヨークを前
記円盤状光情報記録媒体の記録面に対し平行な複数の板
金部材により積層形成し、該複数の板金部材のうち少な
くとも１枚の板金部材が、他の板金部材と形状の異なる
部分を有し、該形状の異なる部分を前記第１のヨークに
当接して前記第２のヨークの位置を規定していること、
更には、（６）前記（１）乃至（５）において、前記駆
動コイルの巻回中心軸に対して直角、かつ、該駆動コイ
ルの移動範囲内の第１のヨーク及び第２のヨークの断面
において、前記第２のヨークの前記円盤状光情報記録媒
体の記録面に対し垂直な方向の厚さは、前記第１のヨー
クと比べ薄く、断面積はほぼ等しくしたこと、更には、
（７）前記（６）において、前記第１のヨークと第２の
ヨークの連結部分は、前記光ヘッドの移動方向に対して
直角方向のほぼ全域にわたり、かつ、前記円盤状光情報
記録媒体の記録面に対し垂直な方向の高さが前記第１の
ヨークとほぼ同じ高さに形成したこと、更には、（８）
前記（１）乃至（７）において、前記光情報記録再生装
置のフレーム部材を磁性材により形成し、該フレーム部
材が前記第１のヨークの一部を構成することを特徴とす
るものである。In order to solve the above problems, the present invention provides (1) an optical head for recording, reproducing or erasing information on a disc-shaped optical information recording medium, and a support for the optical head. A guide shaft for guiding the optical head in the moving direction, a drive coil fixed to the optical head and having a winding center axis arranged in parallel to the moving direction, and the drive coil in the moving direction. A magnetic circuit for applying a magnetic field in a direction perpendicular to the magnetic circuit, the magnetic circuit having a constant air gap with respect to the outer surface of the drive coil, and the permanent magnet arranged parallel to the moving direction of the drive coil. A first yoke to which one magnetic pole of the permanent magnet is fixed, and a magnetic gap facing the other magnetic pole of the permanent magnet to apply a magnetic field to the drive coil. Moving the optical head In an optical head driving mechanism in an optical information recording / reproducing apparatus, which is composed of a second yoke connected to the first yoke at opposite ends, the first yoke is used as a recording surface of the disc-shaped optical information recording medium. Is formed by laminating a plurality of sheet metal members parallel to each other, and at least one sheet metal member of the plurality of sheet metal members has a portion different in shape from other sheet metal members, and the portion different in shape is recorded with optical information. It is characterized in that it is fixed to a frame member of a reproducing apparatus, and further, (2) in the above (1), the first
The sheet metal member not having the different shape portion of the yoke has a cutout portion near the center of the side opposite to the side where the permanent magnet is arranged, and the different shape portion of the first yoke. A sheet metal member having a part having different shapes in a part corresponding to the cutout part,
(3) In the above (1), the first yoke is a U-shaped yoke integrally having side yokes for connecting to the second yoke at both ends thereof, and the shape thereof is one of the above. The sheet metal member having no different portions has chamfers or the like at the corners of both ends, and the remaining sheet metal member having the portions having different shapes has the portions having different shapes in the portions corresponding to the chamfered portions. It is characterized by
Alternatively, (4) an optical head that records, reproduces, or erases information on a disc-shaped optical information recording medium, a guide shaft that supports the optical head and guides the optical head in its moving direction, and the optical head. And a magnetic circuit having a winding center axis arranged parallel to the moving direction and a magnetic circuit for applying a magnetic field in a direction perpendicular to the moving direction to the driving coil. The circuit includes a permanent magnet having a constant air gap with respect to an outer surface of the drive coil and arranged in parallel with a moving direction of the drive coil, and a first yoke to which one magnetic pole of the permanent magnet is fixed. A magnetic gap that faces the other magnetic pole of the permanent magnet and applies a magnetic field to the drive coil, and is connected to the first yoke at both ends of the first yoke in the moving direction of the optical head. With two yokes In the optical head driving mechanism of the optical information recording / reproducing apparatus, the first yoke is laminated by a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium, and the plurality of sheet metal members are formed. At least one of the sheet metal members has a portion having a different shape from the other sheet metal members, and the portion having the different shape is brought into contact with the second yoke to define the position of the second yoke, (5) In (4), the second yoke is laminated by a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium, and at least one of the plurality of sheet metal members is formed. The sheet metal member has a portion different in shape from other sheet metal members, and the portion different in shape is brought into contact with the first yoke to define the position of the second yoke,
Furthermore, (6) In (1) to (5) above, the cross section of the first yoke and the second yoke is perpendicular to the winding center axis of the drive coil and within the moving range of the drive coil. In, the thickness of the second yoke in the direction perpendicular to the recording surface of the disc-shaped optical information recording medium is thinner than that of the first yoke, and the cross-sectional areas are substantially equal.
(7) In (6), the connecting portion of the first yoke and the second yoke covers almost the entire area in a direction perpendicular to the moving direction of the optical head, and the connecting portion of the disc-shaped optical information recording medium is formed. The height in the direction perpendicular to the recording surface is substantially the same as that of the first yoke, and further, (8)
In the above (1) to (7), the frame member of the optical information recording / reproducing apparatus is formed of a magnetic material, and the frame member constitutes a part of the first yoke.
【０００７】[0007]
【作用】請求項１の発明では、磁気回路が第１のヨーク
と第２のヨークとから構成される光ヘッド駆動機構にお
いて、前記第１のヨークを前記円盤状光情報記録媒体に
平行な複数の板金部材により積層形成し、該複数の板金
部材のうち少なくとも１枚の板金部材が、他の板金部材
と形状の異なる部分を有し、該形状の異なる部分を光情
報記録再生装置のフレーム部材に固定することにより、
フレーム部材に対する磁気回路の固定を簡単にし、か
つ、薄型化、高精度化を実現する。請求項２の発明で
は、前記第１のヨークの前記形状の異なる部分を持たな
い板金部材は、前記永久磁石が配置される辺に対向する
辺の中央部近傍に切欠き部を有し、前記第１のヨークの
前記形状の異なる部分を持つ板金部材は、前記切欠き部
に相当する部分に前記形状の異なる部分を有するように
し、フレーム部材に対する磁気回路の固定をスペース効
率良く行う。請求項３の発明では、前記第１のヨーク
は、その両端部に前記第２のヨークと連結するための側
部ヨークを一体的に有するコの字型のヨークからなり、
そのうちの前記形状の異なる部分を持たない板金部材
は、両端部の角部に面取り等を有し、残りの前記形状の
異なる部分を持つ板金部材は、前記面取り部に相当する
部分に前記形状の異なる部分を有するようにし、フレー
ム部材に対する磁気回路の固定をスペース効率良く行
う。請求項４の発明では、磁気回路が第１のヨークと第
２のヨークとから構成される光情報記録再生装置におけ
る光ヘッド駆動機構において、前記第１のヨークを前記
円盤状光情報記録媒体に対し平行な複数の板金部材によ
り積層形成し、該複数の板金部材のうち少なくとも１枚
の板金部材が、他の板金部材と形状の異なる部分を有
し、該形状の異なる部分を前記第２のヨークに当接して
該第２のヨークの位置を規定するようにし、磁気回路を
構成する２つのヨーク間の連結を簡単にし、かつ、薄型
化、高精度化を実現する。請求項５の発明では、前記第
２のヨークを前記円盤状光情報記録媒体に対し平行な複
数の板金部材により積層形成し、該複数の板金部材のう
ち少なくとも１枚の板金部材が、他の板金部材と形状の
異なる部分を有し、該形状の異なる部分を前記第１のヨ
ークに当接して前記第２のヨークの位置を規定するよう
にし、磁気回路を構成する２つのヨーク間の連結を簡単
にし、かつ、薄型化、高精度化を実現する。請求項６の
発明では、前記駆動コイルの巻回中心軸に対して直角、
かつ、該駆動コイルの移動範囲内の第１のヨーク及び第
２のヨークの断面において、前記第２のヨークの前記円
盤状光情報記録媒体の記録面に対して垂直な方向の厚さ
を前記第１のヨークと比べ薄く、断面積をほぼ等しくす
ることにより、リニアモータを薄くし、薄型化を実現す
る。請求項７の発明では、前記第１のヨークと第２のヨ
ークの連結部分が、前記光ヘッドの移動方向対し直角方
向の全域にわたるようにし、かつ、前記円盤状光情報記
録媒体の記録面に対して垂直な方向の高さが前記第１の
ヨークとほぼ同じ高さになるように形成することによ
り、磁気回路を小型化する。請求項８の発明では、前記
光情報記録再生装置のフレーム部材を磁性材により形成
し、該フレーム部材にて前記第１のヨークの一部を構成
することにより、フレーム部材の剛性を上げ、装置の高
信頼性化を図る。According to the invention of claim 1, in the optical head drive mechanism in which the magnetic circuit is composed of the first yoke and the second yoke, the first yokes are arranged in parallel to the disk-shaped optical information recording medium. Of the plurality of sheet metal members, at least one of the plurality of sheet metal members has a portion having a different shape from the other sheet metal members, and the portion having the different shape is a frame member of the optical information recording / reproducing apparatus. By fixing to
A magnetic circuit can be easily fixed to a frame member, and thinning and high accuracy can be realized. In the invention of claim 2, the sheet metal member of the first yoke that does not have the portion having the different shape has a cutout portion in the vicinity of the central portion of the side facing the side where the permanent magnet is arranged, The sheet metal member having the portion having the different shape of the first yoke has the portion having the different shape in the portion corresponding to the cutout portion, so that the magnetic circuit is fixed to the frame member with space efficiency. In the invention of claim 3, the first yoke is a U-shaped yoke integrally having side yokes at both ends thereof for connecting to the second yoke,
Among them, the sheet metal member not having the portion having the different shape has chamfers or the like at the corners of both ends, and the sheet metal member having the remaining portions having the different shape has the above-mentioned shape at the portion corresponding to the chamfered portion. By having different parts, the magnetic circuit is fixed to the frame member in a space-efficient manner. According to a fourth aspect of the present invention, in the optical head drive mechanism of the optical information recording / reproducing apparatus in which the magnetic circuit includes the first yoke and the second yoke, the first yoke is used as the disc-shaped optical information recording medium. A plurality of sheet metal members that are parallel to each other are laminated and formed, and at least one sheet metal member of the plurality of sheet metal members has a portion having a different shape from other sheet metal members, and the portion having the different shape is the second portion. By contacting the yoke to define the position of the second yoke, the connection between the two yokes forming the magnetic circuit is simplified, and the thinning and high accuracy are realized. In the invention of claim 5, the second yoke is formed by laminating a plurality of sheet metal members parallel to the disc-shaped optical information recording medium, and at least one of the plurality of sheet metal members is the other. Connection between two yokes forming a magnetic circuit, having a portion having a shape different from that of the sheet metal member, and contacting the portion having a different shape with the first yoke to define the position of the second yoke. It is easy to realize, thin, and highly accurate. In the invention of claim 6, the drive coil is perpendicular to the winding center axis,
In addition, in the cross section of the first yoke and the second yoke within the moving range of the drive coil, the thickness of the second yoke in the direction perpendicular to the recording surface of the disc-shaped optical information recording medium is By making the linear motor thinner than the first yoke and making the cross-sectional areas approximately the same, the linear motor can be made thinner and thinner. According to a seventh aspect of the present invention, the connecting portion of the first yoke and the second yoke is formed so as to cover the entire area in a direction perpendicular to the moving direction of the optical head, and the recording surface of the disc-shaped optical information recording medium is formed. The magnetic circuit is made smaller by forming the height in the direction perpendicular to the first yoke to be substantially the same as the height of the first yoke. In the invention of claim 8, the frame member of the optical information recording / reproducing apparatus is formed of a magnetic material, and the frame member constitutes a part of the first yoke, whereby the rigidity of the frame member is increased and the apparatus is improved. For higher reliability.
【０００８】[0008]
【実施例】図１は、請求項１の発明を説明するための要
部構成部の斜視図で、図１３に示した従来技術と同様、
光ディスク（円盤状光情報記録媒体）１に対し、情報の
記録、再生若しくは消去を行う光ヘッド２が、２本のガ
イドシャフト３により光ディスク１の半径方向に移動可
能に支持され、光ヘッド２の両側端には、光ヘッド２の
移動方向に平行な軸を中心に巻回された駆動コイル４が
固定され、駆動コイル４の一辺は磁気回路５の磁気ギャ
ップ８内に位置している。永久磁石６により光ヘッド２
の移動方向と直角方向に磁場が与えられており、駆動コ
イル４に電流を供給すると、該駆動コイル４は光ヘッド
移動方向に移動し、光ヘッド２を矢印方向に駆動する。
すなわち、磁気回路５は、駆動コイル４の外側面に対
し、一定の空隙をもって光ヘッド２の移動方向と平行に
配置された永久磁石６と、該永久磁石６の一方の磁極が
固定された外ヨーク(第１のヨーク)７と、前記永久磁石
６の他方の磁極と対向して磁気ギャップ８を形成すると
ともに駆動コイル４内に挿入された内ヨーク(第２のヨ
ーク)９とから構成され、これら外ヨーク７と内ヨーク
９とは、光ヘッドの移動方向の両端部で連結されてい
る。内ヨーク９は光ディスク１の記録面に対して垂直に
複数枚（図示例の場合、９1，９2，９3，９4の４枚）の
板金部材が厚み方向に重ねられて形成され、外ヨーク７
は光ディスク１の記録面に対し平行に複数枚（図示例の
場合、７1，７2，７3，７4の４枚）の板金部材が厚み方
向に重ねられて形成され、更に、外ヨーク７を積層形成
する板金部材のうち内側（図示例の場合、７2，７3の２
枚）の板金部材は、外側（図示例の場合、７1，７4の２
枚）の板金部材と形状が異なる部分７2a，７3aを有し、
該形状が異なる部分７2a，７3aと装置のフレーム部材１
２とがねじ１７により固定されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of the essential parts for explaining the invention of claim 1, and is similar to the prior art shown in FIG.
An optical head 2 for recording, reproducing, or erasing information on an optical disk (disc-shaped optical information recording medium) 1 is supported by two guide shafts 3 so as to be movable in the radial direction of the optical disk 1, and A drive coil 4 wound around an axis parallel to the moving direction of the optical head 2 is fixed to both ends, and one side of the drive coil 4 is located in the magnetic gap 8 of the magnetic circuit 5. Optical head 2 with permanent magnet 6
When a magnetic field is applied in the direction perpendicular to the moving direction of the drive coil and a current is supplied to the drive coil 4, the drive coil 4 moves in the moving direction of the optical head and drives the optical head 2 in the arrow direction.
That is, the magnetic circuit 5 includes a permanent magnet 6 arranged parallel to the moving direction of the optical head 2 with a certain gap on the outer surface of the drive coil 4, and an outer magnetic pole to which one magnetic pole of the permanent magnet 6 is fixed. It is composed of a yoke (first yoke) 7 and an inner yoke (second yoke) 9 which is inserted into the drive coil 4 while forming a magnetic gap 8 facing the other magnetic pole of the permanent magnet 6. The outer yoke 7 and the inner yoke 9 are connected at both ends in the moving direction of the optical head. The inner yoke 9 is formed by stacking a plurality of sheet metal members ( four in the illustrated example, 9 1 , 9 2 , 9 3 , and 9 4 ) in the thickness direction in a direction perpendicular to the recording surface of the optical disc 1. Outer yoke 7
Is formed by stacking a plurality of sheet metal members ( four in the illustrated example, 7 1 , 7 2 , 7 3 , and 7 4 ) in parallel to the recording surface of the optical disc 1 in the thickness direction. Inside of the sheet metal members forming 7 in a stacked manner (in the case of the illustrated example, 7 2 and 7 3 2
The sheet metal member of the sheet is the outside (in the case of the illustrated example, 2 of 7 1 and 7 4 ).
Sheet metal members having different shapes 7 2a and 7 3a ,
The parts 7 2a and 7 3a having different shapes and the frame member 1 of the apparatus
2 and 2 are fixed by screws 17.
【０００９】図２は、図１に示した前記固定部７2a，７
3aとフレーム部材１２との固定部分の断面図で、図２に
示すように、板金部材７2，７3に形成された固定部
７2a，７2bの下部にはフレーム部材１２があり、該フレ
ーム部材１２の面と板金部材７4の面とは同一面にして
あり、また、前記固定部７2aの上部には、ねじ１７の頭
部１７ａが出るが、このねじ１７の頭部１７ａの面と板
金部材７1の面とが同一面になるように形成されてい
る。FIG. 2 shows the fixing portions 7 2a , 7a shown in FIG.
3 is a cross-sectional view of a fixed portion between the frame member 12 and the frame member 12, and as shown in FIG. 2, the frame member 12 is provided below the fixing portions 7 2a and 7 2b formed on the sheet metal members 7 2 and 7 3. The surface of the frame member 12 and the surface of the sheet metal member 7 4 are flush with each other, and the head 17a of the screw 17 is projected above the fixing portion 7 2a . The surface and the surface of the sheet metal member 7 1 are formed so as to be flush with each other.
【００１０】以上の説明から明らかなように、本発明で
は外ヨーク７のフレーム部材１２に対する固定に必要な
高さ方向は外ヨーク７の高さ内に納まり、装置の薄型化
が固定方法によっては制限されない。また、永久磁石６
が板金部材７1〜７4の側端面（加工面）に固定されてお
り、フレーム部材１２と永久磁石６との位置規定に板金
部材の厚み精度が影響せず、板金部材の加工精度で位置
関係が規定されるため、正確な位置規定が可能となり、
従って、磁気ギャップ８を小さくすることが可能とな
り、リニアモータの高精度化、高推力化が可能となる。
また、本実施例では、コの字型の外ヨーク７はコの字型
の板金部材７1〜７4により形成しているため、曲げ加工
は行っていない。従って、加工コストが少なくなり、装
置の低コスト化も可能となる。ここで、外ヨーク７を形
成する複数枚の板金部材７1〜７4を一体に結合する方法
としては、接着、カシメ、溶接等様々な方法が考えら
れ、任意所望の方法が選択可能である。As is apparent from the above description, in the present invention, the height direction required for fixing the outer yoke 7 to the frame member 12 is within the height of the outer yoke 7, and depending on the fixing method, the device can be made thinner. Not limited. In addition, the permanent magnet 6
There is fixed to the side end face of the sheet metal member 7 1-7 4 (processing surface), without affecting the thickness accuracy of the sheet metal member to position defining the frame member 12 and the permanent magnet 6, the position in the machining accuracy of the sheet metal member Since the relationship is specified, it is possible to specify the exact position,
Therefore, the magnetic gap 8 can be reduced, and the linear motor can be made highly accurate and highly thrust.
Further, in this embodiment, the outer yoke 7 of U shape because it has formed by the sheet metal member 7 1-7 4 U-shaped, bending is not performed. Therefore, the processing cost is reduced and the cost of the device can be reduced. Here, various methods such as adhesion, caulking, and welding can be considered as a method of integrally joining the plurality of sheet metal members 7 1 to 7 4 forming the outer yoke 7, and any desired method can be selected. .
【００１１】図３は、請求項２の発明を説明するための
要部平面図で、図３に示すように、板金部材７1には、
永久磁石６が配置される辺に対向する辺の中央部近傍に
ねじ１７の頭部１７ａに対するニゲ部（切欠き部）７1a
（７4a）が形成され、板金部材７2（７3）には前記ニゲ
部７1aに相当する部分に、固定部７2aが形成されてい
る。而して、磁気回路５においては、光ヘッド１２の移
動方向における両端部に最も多く磁力線が流れ、中央部
が最も少ないため、磁気回路中央部の断面積を両端部に
比べて小さくすることが可能であり、従って、板金部材
７1（７4）の中央部の幅を削減し、ニゲ部７1a（７4a）
を形成することが可能となる。[0011] Figure 3 is a fragmentary plan view for explaining a second aspect of the present invention, as shown in FIG. 3, the sheet metal member 71 is
In the vicinity of the central portion of the side opposite to the side where the permanent magnet 6 is arranged, a nigue portion (notch portion) 7 1a for the head 17a of the screw 17 is formed.
(7 4a ) is formed, and the sheet metal member 7 2 (7 3 ) is provided with a fixing portion 7 2a at a portion corresponding to the nig portion 7 1a . Thus, in the magnetic circuit 5, the lines of magnetic force flow most at both ends in the moving direction of the optical head 12 and the central part is the least, so that the cross-sectional area of the central part of the magnetic circuit can be made smaller than that at both ends. It is possible, therefore, the width of the central portion of the sheet metal member 7 1 (7 4 ) is reduced, and the nig portion 7 1a (7 4a ) is reduced.
Can be formed.
【００１２】図４は、図３における前記固定部の断面図
（図３のIV−IV線断面図）で、図４に示すように、板金
部材７3に形成された固定部７3aの下部の板金部材７4に
形成されたニゲ部（７4a）には、フレーム部材１２が位
置し、該フレーム部材１２の下面と下側板金部材７4の
下面とは同一面にしてあり、また、板金部材７2に形成
された固定部７2aの上部に形成された板金部材７1のニ
ゲ部７1aには、ねじ１７の頭部１７ａが位置し、該ねじ
１７の頭部１７ａの面と上部板金部材７1の上面とは同
一面にしてある。このため、外ヨーク７をフレーム部材
１２に固定するのに必要な高さ寸法は外ヨーク７の高さ
内に納まり、装置の薄型化が可能であるとともに、外ヨ
ーク７のフレーム部材１２に対する固定に必要な幅も大
幅に削減され、装置の小型化が可能となる。[0012] Figure 4 is a cross-sectional view of the fixing portion in FIG. 3 (IV-IV line sectional view of FIG. 3), as shown in FIG. 4, the lower portion of the fixing portion 7 3a formed in the sheet metal member 7 3 The frame member 12 is located in the nigue portion (7 4a ) formed on the sheet metal member 7 4 , and the lower surface of the frame member 12 and the lower surface of the lower sheet metal member 7 4 are flush with each other. The head portion 17a of the screw 17 is located in the relief portion 7 1a of the sheet metal member 7 1 formed on the fixed portion 7 2a formed on the sheet metal member 7 2 , and the head 17a of the screw 17 is It is flush with the upper surface of the upper sheet metal member 7 1 . Therefore, the height dimension required for fixing the outer yoke 7 to the frame member 12 is within the height of the outer yoke 7, the device can be thinned, and the outer yoke 7 is fixed to the frame member 12. The width required for the device is also greatly reduced, and the device can be downsized.
【００１３】図５は、請求項３の発明を説明するための
要部平面図で、図５に示すように、板金部材７2，７3の
固定部７2a，７3a（この部分は、同時に、板金部材
７1，７4の切り欠き部でもある）は、コの字型に形成さ
れた板金部材７2，７3の角部に形成されており、板金部
材７1，７4の前記固定部７2a，７3aに対応する部分は面
取りされ、ねじ１７の頭部１７ａに対するニゲ部７1aを
形成されている。而して、外ヨーク７の光ヘッド移動方
向両端部には内ヨーク９と連結するために略直角に延長
する側路が形成されるが、その角部においては、磁力線
の流れがヨークに沿って曲るため、磁力線の流れる方向
に直角な断面積が一定となるようヨークを形成した場
合、角部に面取りあるいはＲの形成が可能となる。従っ
て、板金部材７1，７4を面取り等し、ニゲ部７
1a（７4a）を形成することが可能となる。FIG. 5 is a plan view of an essential part for explaining the invention of claim 3, and as shown in FIG. 5, the fixing parts 7 2a and 7 3a of the sheet metal members 7 2 and 7 3 (this part is at the same time, the sheet metal member 7 1, 7 is also the fourth notches) are formed at the corner portion of the plate member 7 2, 7 3 formed in U-shape, the sheet metal member 7 1, 7 4 The portions corresponding to the fixing portions 7 2a and 7 3a are chamfered to form a nig portion 7 1a for the head 17a of the screw 17. Thus, a side path extending at a substantially right angle is formed at both ends of the outer yoke 7 in the optical head moving direction so as to be connected to the inner yoke 9. At the corners, the flow of magnetic force lines runs along the yoke. Therefore, when the yoke is formed so that the cross-sectional area perpendicular to the direction of the magnetic force lines is constant, it is possible to chamfer or form R at the corners. Therefore, the sheet metal members 7 1 and 7 4 are chamfered and the
It becomes possible to form 1a ( 74a ).
【００１４】図６は、図５に示した前記固定部分の断面
図（図５のVI−VI線断面図）で、図６に示すように、板
金部材７2，７3に形成された固定部７2a，７3aの下部の
板金部材７4に形成されたニゲ部７4aには、フレーム部
材１２が位置し、該フレーム部材１２の面と板金部材７
4の面とは同一面にしてあり、また、板金部材７2に形成
された固定部７2aの上部の板金部材７1に形成されたニ
ゲ部７1aには、ねじ１７の頭部１７ａが位置し、該ねじ
１７の頭部１７ａの面と板金部材７1の面とは同じ高さ
にしてある。このため、外ヨーク７をフレーム部材１２
に固定するのに必要な高さは外ヨーク７の高さ内に納ま
り、装置の薄型化が可能であるとともに、外ヨーク７を
フレーム部材１２に固定するのに必要な幅も大幅に削減
され、装置の小型化が可能となる。FIG. 6 is a sectional view of the fixing portion shown in FIG. 5 (a sectional view taken along the line VI-VI of FIG. 5). As shown in FIG. 6, the fixing members formed on the sheet metal members 7 2 and 7 3 are fixed. The frame member 12 is located in the nigue portion 7 4a formed on the sheet metal member 7 4 below the portions 7 2a and 7 3a , and the surface of the frame member 12 and the sheet metal member 7
4 is the same surface, and the head portion 17a of the screw 17 is attached to the nipping portion 7 1a formed on the sheet metal member 7 1 above the fixing portion 7 2a formed on the sheet metal member 7 2. The surface of the head 17a of the screw 17 and the surface of the sheet metal member 7 1 are located at the same height. Therefore, the outer yoke 7 is attached to the frame member 12
The height required to fix the outer yoke 7 to the frame member 12 can be reduced, and the width required to fix the outer yoke 7 to the frame member 12 can be greatly reduced. It is possible to downsize the device.
【００１５】図７は、請求項４の発明を説明するための
要部斜視図で、図７に示すように、外ヨーク７と内ヨー
ク９との連結部は、外ヨーク７2，７3によって形成され
る凹部７2b，７3bに内ヨーク９によって形成される凸部
９1b〜９4bが嵌合されている。前記内ヨーク９の凸部９
1b〜９4bは、凸形状を持った板金部材９1〜９4を光ディ
スク１の記録面に対し垂直にして、複数枚（図示例の場
合、４枚）重ねて形成したものであり、前記外ヨーク７
は、該外ヨーク７を形成するの板金部材７1〜７4のうち
内側板金部材７2，７3が前記凹部７2b，７3bを形成すべ
く、外側の板金部材７1，７4に比し７1b，７4bの部分だ
け短くなっており、これら４枚の板金部材７1〜７4を光
ディスク１に対して平行に重ねて得られたものである。
従って、リニアモータが薄型化した場合においても、外
ヨーク７2，７3の凹部７2b，７3bは、加工された板金部
材を重ねるだけなので精度良く形成することができ、外
ヨーク７に対する内ヨーク９の位置を正確に規定するこ
とが可能となるとともに、磁気ギャップ８を小さくする
ことが可能となり、リニアモータの薄型化、低コスト化
とともに、高精度化、高推力化が可能となる。FIG. 7 is a perspective view of an essential part for explaining the invention of claim 4, and as shown in FIG. 7, the connecting portion between the outer yoke 7 and the inner yoke 9 is the outer yokes 7 2 , 7 3. protrusions 9 1b to 9 4b formed by the inner yoke 9 is fitted into the recess 7 2b, 7 3b formed by. The convex portion 9 of the inner yoke 9
1b to 9 4b is a sheet metal member 9 to 93 4 having a convex shape in the perpendicular to the recording surface of the optical disk 1, a plurality (in the illustrated example, four) are those formed by overlapping the Outer yoke 7
Of the sheet metal members 7 1 to 7 4 forming the outer yoke 7, the inner sheet metal members 7 2 and 7 3 are formed on the outer sheet metal members 7 1 and 7 4 so as to form the recesses 7 2b and 7 3b. Compared with this, only the portions 7 1b and 7 4b are shorter, and these four sheet metal members 7 1 to 7 4 are obtained by stacking them in parallel with the optical disc 1.
Therefore, even when the linear motor is made thin, the recesses 7 2b and 7 3b of the outer yokes 7 2 and 7 3 can be accurately formed because only the processed sheet metal members are overlapped with each other. The position of the yoke 9 can be accurately defined, and the magnetic gap 8 can be made small, so that the linear motor can be made thinner and the cost can be reduced, and the precision and the thrust can be increased.
【００１６】図８は、請求項５の発明を説明するための
要部斜視図で、図８に示すように、外ヨーク７と内ヨー
ク９との連結部は、外ヨーク７2，７3の凹部７2b，７3b
と内ヨーク９の凸部９2，９3とが嵌合しているものであ
る。前記内ヨーク９の凸部９2b，９3bは、内ヨーク９を
形成する板金部材のうち内側の板金部材９2，９3が、前
記連結部において外側板金部材９1，９4に比し長くなっ
ているものを、光ディスク１に対して平行に重ねて得ら
れたものであり、前記外ヨーク７2，７3の凹部７2b，７
3bは、外ヨーク７を形成する板金部材のうち内側の板金
部材７2，７3が前記連結部において、外側の板金部材７
1，７4に比し７1b，７4bの部分だけ短くなっているもの
を、光ディスク１に対して平行に４枚重ね得られたもの
である。従って、リニアモータを薄型化した場合におい
ても、内ヨーク９の凸部は、加工された板金部材を重ね
るだけなので精度良く形成することができるため、外ヨ
ーク７に対する内ヨーク９の位置を正確に規定すること
が可能となるとともに、磁気ギャップ８を小さくするこ
とが可能となり、リニアモータの薄型化、低コスト化と
ともに、高精度化、高推力化が可能となる。なお、内ヨ
ーク９を形成する板金部材９1〜９4を一体に結合する方
法としては、接着、カシメ、溶接等様々な方法が考えら
れ、任意所望の方法を選択することが可能である。FIG. 8 is a perspective view of an essential part for explaining the invention of claim 5, and as shown in FIG. 8, the connecting portion between the outer yoke 7 and the inner yoke 9 is the outer yokes 7 2 , 7 3. Recesses 7 2b , 7 3b
The convex portions 9 2 and 9 3 of the inner yoke 9 are fitted together. The convex portions 9 2b and 9 3b of the inner yoke 9 are such that the inner sheet metal members 9 2 and 9 3 among the sheet metal members forming the inner yoke 9 are different from the outer sheet metal members 9 1 and 9 4 at the connecting portion. It is obtained by stacking the longer ones in parallel with the optical disc 1, and the recesses 7 2b and 7 of the outer yokes 7 2 and 7 3 are obtained.
3b shows that among the sheet metal members forming the outer yoke 7, the inner sheet metal members 7 2 and 7 3 are at the connecting portion and the outer sheet metal member 7 2
1, 7 what has only short portions of 4 to comparison 7 1b, 7 4b, is obtained parallel overlapping four with respect to the optical disc 1. Therefore, even when the linear motor is made thin, the convex portion of the inner yoke 9 can be accurately formed because the processed sheet metal members are simply stacked, so that the position of the inner yoke 9 with respect to the outer yoke 7 can be accurately set. In addition to being able to specify, the magnetic gap 8 can be made small, and the linear motor can be made thin and low cost, and high accuracy and high thrust can be achieved. As a method of integrally joining the sheet metal members 9 1 to 9 4 forming the inner yoke 9, various methods such as adhesion, caulking, and welding can be considered, and any desired method can be selected.
【００１７】図９，図１０は、請求項６の発明を説明す
るための図で、図９に示すように、外ヨーク７は光ディ
スク１の記録面に対し平行な板金部材７1〜７4を厚み方
向に複数枚（図示例の場合、４枚）重ねて形成されてお
り、板金部材７2，７3の固定部７2a，７3aは、光ヘッド
２の移動方向における両端部近傍に形成されており、板
金部材７1，７4の前記固定部７2a，７3aに対応する部分
を面取り７1a〜７4aしてねじ１７の頭部１７ａに対する
ニゲ部７1aを形成し、更に、外ヨーク７を形成する板金
部材のうち内側の板金部材７2，７3は外側の板金部材７
1，７4と形状が異なり、光ヘッド移動方向両端部で内ヨ
ーク９と連結するための連結部７2b，７3bにおいて板金
部材７1，７4に比べ、７2b（７3b）分だけ短く形成され
た凹部７2b，７3bを有し、また、内ヨーク９は光ディス
ク１の記録面に対し平行な板金部材９2，９3を厚み方向
に２枚重ねて形成されており、光ヘッド移動方向両端部
において、この２枚の板金部材が外ヨーク７2，７3の凹
部７2b，７3bに嵌合されている。FIG. 9, FIG. 10 is a diagram for explaining the invention of claim 6, as shown in FIG. 9, the outer yoke 7 is the recording surface with respect to parallel sheet metal member 7 1-7 4 of the optical disk 1 Are stacked in the thickness direction (4 sheets in the illustrated example), and the fixed portions 7 2a and 7 3a of the sheet metal members 7 2 and 7 3 are located near both ends in the moving direction of the optical head 2. The portions of the sheet metal members 7 1 and 7 4 corresponding to the fixed portions 7 2a and 7 3a are chamfered 7 1a to 7 4a to form a nig portion 7 1a for the head 17a of the screw 17, and , The inner sheet metal members 7 2 and 7 3 among the sheet metal members forming the outer yoke 7 are the outer sheet metal members 7
The shape is different from that of 1 and 7 4 and is 7 2b (7 3b ) in comparison with the sheet metal members 7 1 and 7 4 at the connecting portions 7 2b and 7 3b for connecting to the inner yoke 9 at both ends in the optical head moving direction. has a short recess formed 7 2b, 7 3b, the inner yoke 9 is formed with two-ply in the thickness direction parallel sheet metal member 9 2, 9 3 with respect to the recording surface of the optical disk 1, light The two sheet metal members are fitted into the recesses 7 2b and 7 3b of the outer yokes 7 2 and 7 3 at both ends in the head moving direction.
【００１８】図１０は、図９のＸ−Ｘ線断面図で、図１
０に示すように、内ヨーク９は板金材料９2，９3によっ
て形成されており、外ヨーク７は板金部材７1〜７4によ
って形成されているため、内ヨーク９は外ヨーク７と比
べ薄いが、ほぼ同じ断面積を有し、内ヨーク９の回りに
巻回された駆動コイル４の高さは外ヨーク７とほぼ同じ
となっている。従って、内ヨーク９は外ヨーク７とほぼ
同じ断面積を確保しつつ、リニアモータの高さ方向を外
ヨーク７の高さ内に納めることが出来るため、リニアモ
ータの性能を低下させることなく、装置の薄型化が可能
となる。FIG. 10 is a sectional view taken along line XX of FIG.
As shown in 0, the inner yoke 9 is formed of sheet metal materials 9 2 and 9 3 and the outer yoke 7 is formed of sheet metal members 7 1 to 7 4 , so that the inner yoke 9 is different from the outer yoke 7. Although it is thin, it has almost the same cross-sectional area, and the height of the drive coil 4 wound around the inner yoke 9 is almost the same as that of the outer yoke 7. Therefore, the inner yoke 9 can be accommodated in the height direction of the linear motor within the height of the outer yoke 7 while ensuring the same cross-sectional area as the outer yoke 7, without deteriorating the performance of the linear motor. The device can be made thinner.
【００１９】図１１は、請求項７の発明を説明するため
の図で、図９に示した発明では、外ヨーク７の連結部７
2b（７3b）は該外ヨーク７よりも幅の広い内ヨーク９と
連結するため、その嵌合部の内ヨーク９上面の接合面の
長さＬを内ヨーク９の幅Ｌ′とほぼ同じとしているが、
図１１に示した発明では、外ヨーク７と内ヨーク９の前
記接合面Ｌを内ヨーク９の幅方向全域Ｌ′まで延長し、
長手方向の長さを短くし、外ヨーク７と同じ高さを確保
している。このため、リニアモータは光ヘッド移動方向
において小型化され、装置の小型化が可能となる。FIG. 11 is a view for explaining the invention of claim 7, and in the invention shown in FIG. 9, the connecting portion 7 of the outer yoke 7 is shown.
Since 2b ( 73b ) is connected to the inner yoke 9 having a width wider than that of the outer yoke 7, the length L of the joint surface of the upper surface of the inner yoke 9 at the fitting portion is substantially the same as the width L'of the inner yoke 9. But
In the invention shown in FIG. 11, the joint surface L of the outer yoke 7 and the inner yoke 9 is extended to the entire width direction L ′ of the inner yoke 9,
The length in the longitudinal direction is shortened to ensure the same height as the outer yoke 7. Therefore, the linear motor is downsized in the moving direction of the optical head, and the device can be downsized.
【００２０】図１２は、請求項８の発明を説明するため
の図で、図１２に示すように、フレーム部材１２を磁性
材により形成し、該フレーム部材１２の一部分が外ヨー
ク７の一部を形成している。つまり、外ヨーク７を形成
している板金部材の１枚が、磁性材により形成されたフ
レーム部材１２と結合した状態となっている。図１乃至
図１１で説明した発明では、フレーム部材１２は外ヨー
ク７との干渉を防ぐための外ヨーク７の分をも含んだ大
きな穴を形成する必要があり、そのため、強度が低下
し、剛性上問題となる危険がある。それに対し、図１２
で示した発明では、フレーム部材１２の穴は、外ヨーク
７との接触を防ぐための分小さくなり、高剛性化を可能
とし、装置の高信頼性化が実現できる。FIG. 12 is a view for explaining the invention of claim 8 and, as shown in FIG. 12, the frame member 12 is made of a magnetic material, and a part of the frame member 12 is a part of the outer yoke 7. Is formed. That is, one of the sheet metal members forming the outer yoke 7 is in a state of being connected to the frame member 12 formed of a magnetic material. In the invention described with reference to FIGS. 1 to 11, the frame member 12 needs to be formed with a large hole including the portion of the outer yoke 7 for preventing the interference with the outer yoke 7, which reduces the strength. There is a risk of becoming a problem in terms of rigidity. On the other hand, FIG.
In the invention described in (1), the hole of the frame member 12 is made smaller to prevent contact with the outer yoke 7, so that high rigidity can be achieved and high reliability of the device can be realized.
【００２１】[0021]
【発明の効果】以上の説明から明らかなように本発明に
は以下のような効果がある。 請求項１に対応する効果：第１のヨークを円盤状光情報
記録媒体の記録面に平行な複数の板金部材により積層形
成し、該複数の板金部材のうち少なくとも１つの板金部
材が、他の板金部材と形状の異なる部分を有し、該形状
の異なる部分をもって、光ヘッド駆動機構を光情報記録
再生装置のフレーム部材に固定するようにしたので、フ
レーム部材に対する磁気回路の固定が簡単になり、か
つ、薄型化、高精度化が実現可能となり、装置の低コス
ト化、薄型化、高信頼性化を実現できる。 請求項２に対応する効果：請求項１に対応する効果に加
え、前記第１のヨークの前記形状の異なる部分を持たな
い板金部材は、前記永久磁石が配置される辺に対向する
辺の中央部近傍に切欠き部を有し、前記第１のヨークの
前記形状の異なる部分を持つ板金部材は、前記切欠き部
に相当する部分に前記形状の異なる部分を有するように
したので、フレーム部材に対する磁気回路の固定をスペ
ース効率の良いものにし、装置の小型化を実現できる。 請求項３に対応する効果：請求項１に対応する効果に加
え、前記第１のヨークの前記形状の異なる部分を持たな
いコの字型の板金部材は、該板金部材の角部に面取り等
を有し、前記第１のヨークの前記形状の異なる部分を持
つ板金部材は、前記面取り部に相当する部分に前記形状
の異なる部分を有するようにしたので、フレーム部材に
対する磁気回路の固定をスペース効率の良いものにし、
装置の小型化を実現できる。 請求項４に対応する効果：第１のヨークを円盤状光情報
記録媒体の記録面に対し平行な複数の板金部材により積
層形成し、該複数の板金部材のうち少なくとも１枚の板
金部材が、他の板金部材と形状の異なる部分を有し、該
形状の異なる部分をもって、前記第２のヨークに連結し
て該第２のヨークの位置を規定するようにしたので、磁
気回路を構成する２つのヨーク間の連結が簡単になり、
かつ、薄型化、高精度化が可能となり、装置の低コスト
化、薄型化、高信頼性化を実現できる。 請求項５に対応する効果：請求項４の発明の効果に加
え、前記第２のヨークを前記円盤状光情報記録媒体の記
録面に対し平行な複数の板金部材により積層形成し、該
複数の板金部材のうち少なくとも１枚の板金部材が、他
の板金部材と形状の異なる部分を有し、該形状の異なる
部分をもって、前記第１のヨークに連結して前記第２の
ヨークの位置を規定するようにしたので、磁気回路を構
成する２つのヨーク間の連結が簡単になり、かつ、薄型
化、高精度化が可能となり、装置の低コスト化、薄型
化、高信頼性化を実現できる。 請求項６に対応する効果：請求項１乃至５の発明の効果
に加え、前記駆動コイルの巻回中心軸に対して直角、か
つ、該駆動コイルの移動範囲内の第１のヨーク及び第２
のヨークの断面において、前記第２のヨークの前記円盤
状光情報記録媒体の記録面に対し垂直な方向の厚さを、
前記第１のヨークと比べ薄く、かつ、断面積をほぼ等し
くするようにしたので、リニアモータを薄くでき、装置
の薄型化を実現できる。 請求項７に対応する効果：請求項６の発明の効果に加
え、第１のヨークと第２ヨークの連結部は、前記光ヘッ
ドの移動方向に対して直角方向分の全域にわたり、か
つ、前記連結部分の前記円盤状光情報記録媒体の記録面
に対し垂直な方向の高さを前記第１のヨークとほぼ同じ
高さに形成したので、磁気回路を小型化した光ヘッド駆
動機構提供できる。 請求項８に対応する効果：請求項１乃至７の発明の効果
に加え、前記光情報記録再生装置のフレーム部材を磁性
材により形成し、該フレーム部材が前記第１のヨークの
一部を構成するようにしたので、フレーム部材の剛性を
上げることができ、装置の高信頼性化を図ることができ
る。As is apparent from the above description, the present invention has the following effects. Effect corresponding to claim 1: The first yoke is formed by stacking a plurality of sheet metal members parallel to the recording surface of the disk-shaped optical information recording medium, and at least one of the plurality of sheet metal members is the other. Since the optical head drive mechanism is fixed to the frame member of the optical information recording / reproducing device by having a portion having a shape different from that of the sheet metal member, the fixing of the magnetic circuit to the frame member becomes easy. In addition, thinning and high accuracy can be realized, and cost reduction, thinning, and high reliability of the device can be realized. Effect corresponding to claim 2: In addition to the effect corresponding to claim 1, the sheet metal member of the first yoke that does not have the different shape portion has a center of a side facing the side where the permanent magnet is arranged. Since the sheet metal member having the cutout portion in the vicinity of the cutout portion and having the different shape portion of the first yoke has the different shape portion at the portion corresponding to the cutout portion, the frame member is provided. The magnetic circuit can be fixed to the device with high space efficiency, and the device can be downsized. Effect corresponding to claim 3: In addition to the effect corresponding to claim 1, the U-shaped sheet metal member having no different shape of the first yoke is chamfered at a corner portion of the sheet metal member. Since the sheet metal member having the different shape portion of the first yoke has the different shape portion in the portion corresponding to the chamfered portion, it is possible to fix the magnetic circuit to the frame member in a space. Be efficient,
The size of the device can be reduced. Effect corresponding to claim 4: The first yoke is laminated and formed by a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium, and at least one sheet metal member of the plurality of sheet metal members is formed. Since a portion having a shape different from that of other sheet metal members is provided and the portion having a different shape is connected to the second yoke to define the position of the second yoke, a magnetic circuit is formed. Connection between the two yokes is easy,
In addition, it is possible to reduce the thickness and increase the accuracy, and it is possible to realize the cost reduction, the thickness reduction, and the high reliability of the device. Effect corresponding to claim 5: In addition to the effect of claim 4, the second yoke is formed by laminating a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium. At least one sheet metal member of the sheet metal members has a portion having a different shape from other sheet metal members, and the portion having the different shape is connected to the first yoke to define the position of the second yoke. As a result, the connection between the two yokes forming the magnetic circuit is simplified, and it is possible to reduce the thickness and increase the accuracy of the magnetic circuit, thereby achieving cost reduction, thickness reduction, and high reliability of the device. . Effect corresponding to claim 6: In addition to the effects of the inventions of claims 1 to 5, the first yoke and the second yoke are perpendicular to the winding center axis of the drive coil and within the moving range of the drive coil.
In the cross section of the second yoke, the thickness of the second yoke in the direction perpendicular to the recording surface of the disk-shaped optical information recording medium is
Since the thickness of the linear motor is smaller than that of the first yoke and the cross-sectional areas thereof are substantially equal to each other, the linear motor can be thinned and the device can be thinned. Effect corresponding to claim 7: In addition to the effect of the invention of claim 6, the connecting portion of the first yoke and the second yoke covers the entire area of a direction perpendicular to the moving direction of the optical head, and Since the height of the connecting portion in the direction perpendicular to the recording surface of the disc-shaped optical information recording medium is formed to be substantially the same as that of the first yoke, it is possible to provide an optical head driving mechanism in which the magnetic circuit is downsized. Effect corresponding to claim 8: In addition to the effects of the inventions of claims 1 to 7, the frame member of the optical information recording / reproducing apparatus is formed of a magnetic material, and the frame member constitutes a part of the first yoke. Therefore, the rigidity of the frame member can be increased, and the reliability of the device can be increased.
【図１】 請求項１の発明を説明するための要部構成部
の斜視図である。FIG. 1 is a perspective view of a main component part for explaining the invention of claim 1;
【図２】 図１の要部断面図である。FIG. 2 is a cross-sectional view of a main part of FIG.
【図３】 請求項２の発明を説明するための要部平面図
である。FIG. 3 is a plan view of an essential part for explaining the invention of claim 2;
【図４】 図３の要部断面図である。FIG. 4 is a cross-sectional view of an essential part of FIG.
【図５】 請求項３の発明を説明するための要部平面図
である。FIG. 5 is a main part plan view for explaining the invention of claim 3;
【図６】 図５の要部断面図である。6 is a cross-sectional view of the main parts of FIG.
【図７】 請求項４の発明を説明するための要部構成部
の斜視図である。FIG. 7 is a perspective view of essential parts for explaining the invention of claim 4;
【図８】 請求項５の発明を説明するための要部構成部
の斜視図である。FIG. 8 is a perspective view of essential parts for explaining the invention of claim 5;
【図９】 請求項６の発明を説明するための要部平面図
である。FIG. 9 is a main part plan view for explaining the invention of claim 6;
【図１０】 図９の要部断面図である。10 is a cross-sectional view of the main parts of FIG.
【図１１】 請求項７の発明を説明するための要部平面
図である。FIG. 11 is a plan view of an essential part for explaining the invention of claim 7;
【図１２】 請求項８の発明を説明するための要部構成
部の斜視図である。FIG. 12 is a perspective view of a main component part for explaining the invention of claim 8;
【図１３】 従来技術を説明するための要部構成部の斜
視図である。FIG. 13 is a perspective view of a main component part for explaining a conventional technique.
【符合の説明】 １…光ディスク（円盤状光情報記録媒体）、２…光ヘッ
ド、３…ガイドシャフト、４…駆動コイル、５…磁気回
路、６…永久磁石、７…第１のヨーク（外ヨーク）、７
1〜７4…板金部材、８…磁気ギャップ、９…第２のヨー
ク（内ヨーク）、９1〜９4…板金部材、１２…フレーム
部材、１７…ねじ。[Description of References] 1 ... Optical disc (disc-shaped optical information recording medium), 2 ... Optical head, 3 ... Guide shaft, 4 ... Drive coil, 5 ... Magnetic circuit, 6 ... Permanent magnet, 7 ... First yoke (outer) York), 7
1 to 7 4 ... Sheet metal member, 8 ... Magnetic gap, 9 ... Second yoke (inner yoke), 9 1 to 9 4 ... Sheet metal member, 12 ... Frame member, 17 ... Screw.
Claims (8)
録、再生若しくは消去する光ヘッドと、該光ヘッドを支
持しかつ該光ヘッドをその移動方向に案内するガイドシ
ャフトと、前記光ヘッドに固定されると共にその巻回中
心軸が前記移動方向に対し平行に配置された駆動コイル
と、該駆動コイルに前記移動方向に対し直角な方向の磁
場を与える磁気回路とを有し、該磁気回路は、前記駆動
コイルの外側面に対し一定の空隙を有し該駆動コイルの
移動方向に対し平行に配置された永久磁石と、該永久磁
石の一方の磁極が固定される第１のヨークと、前記永久
磁石の他方の磁極と対向して前記駆動コイルに磁場を与
える磁気ギャップを形成し、前記第１のヨークの前記光
ヘッドの移動方向の両端で前記第１のヨークと連結され
る第２のヨークとから構成される光情報記録再生装置に
おける光ヘッド駆動機構において、前記第１のヨークを
前記円盤状光情報記録媒体の記録面に対し平行な複数の
板金部材により積層形成し、該複数の板金部材のうち少
なくとも１枚の板金部材が、他の板金部材と形状の異な
る部分を有し、該形状の異なる部分を光情報記録再生装
置のフレーム部材に固定することを特徴とする光情報記
録再生装置における光ヘッド駆動機構。1. An optical head for recording, reproducing or erasing information on a disc-shaped optical information recording medium, a guide shaft for supporting the optical head and guiding the optical head in its moving direction, and the optical head. And a magnetic circuit having a winding center axis arranged parallel to the moving direction and a magnetic circuit for applying a magnetic field in a direction perpendicular to the moving direction to the driving coil. The circuit includes a permanent magnet having a constant air gap with respect to an outer surface of the drive coil and arranged in parallel with a moving direction of the drive coil, and a first yoke to which one magnetic pole of the permanent magnet is fixed. A magnetic gap that faces the other magnetic pole of the permanent magnet and applies a magnetic field to the drive coil, and is connected to the first yoke at both ends of the first yoke in the moving direction of the optical head. Like a second yoke In the optical head driving mechanism of the optical information recording / reproducing apparatus, the first yoke is laminated by a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium, and the plurality of sheet metal members are formed. At least one of the sheet metal members has a portion having a different shape from the other sheet metal members, and the portion having the different shape is fixed to a frame member of the optical information recording and reproducing apparatus. Optical head drive mechanism in.
分を持たない板金部材は、前記永久磁石が配置される辺
に対向する辺の中央部近傍に切欠き部を有し、前記第１
のヨークの前記形状の異なる部分を持つ板金部材は、前
記切欠き部に相当する部分に前記形状の異なる部分を有
することを特徴とする請求項１に記載の光情報記録再生
装置における光ヘッド駆動機構。2. The sheet metal member of the first yoke, which does not have the differently shaped portion, has a cutout portion near a central portion of a side opposite to a side where the permanent magnet is arranged, and
2. The optical head drive in an optical information recording / reproducing apparatus according to claim 1, wherein the sheet metal member having the different shape portion of the yoke has the different shape portion in a portion corresponding to the cutout portion. mechanism.
第２のヨークと連結するための側ヨークを一体的に有す
るコの字型のヨークからなり、そのうちの前記形状の異
なる部分を持たない板金部材は、両端部の角部に面取り
等を有し、残りの前記形状の異なる部分を持つ板金部材
は、前記面取り部に相当する部分に前記形状の異なる部
分を有することを特徴とする請求項１に記載の光情報記
録再生装置における光ヘッド駆動機構。3. The first yoke comprises a U-shaped yoke integrally having side yokes for connecting to the second yoke at both ends thereof, and a portion having a different shape among them is formed. The sheet metal member not having has chamfers or the like at the corners of both ends, and the sheet metal member having the remaining portions having different shapes has the portions having different shapes in portions corresponding to the chamfered portions. An optical head drive mechanism in the optical information recording / reproducing apparatus according to claim 1.
録、再生若しくは消去する光ヘッドと、該光ヘッドを支
持しかつ該光ヘッドをその移動方向に案内するガイドシ
ャフトと、前記光ヘッドに固定されると共にその巻回中
心軸が前記移動方向に対し平行に配置された駆動コイル
と、該駆動コイルに前記移動方向に対し直角な方向の磁
場を与える磁気回路とを有し、該磁気回路は、前記駆動
コイルの外側面に対し一定の空隙を有し該駆動コイルの
移動方向に対し平行に配置された永久磁石と、該永久磁
石の一方の磁極が固定される第１のヨークと、前記永久
磁石の他方の磁極と対向して前記駆動コイルに磁場を与
える磁気ギャップを形成し、前記第１のヨークの前記光
ヘッドの移動方向の両端で前記第１のヨークと連結され
る第２のヨークとから構成される光情報記録再生装置に
おける光ヘッド駆動機構において、前記第１のヨークを
前記円盤状光情報記録媒体の記録面に対し平行な複数の
板金部材により積層形成し、該複数の板金部材のうち少
なくとも１枚の板金部材が、他の板金部材と形状の異な
る部分を有し、該形状の異なる部分を前記第２のヨーク
に当接して該第２のヨークの位置を規定していることを
特徴とする光情報記録再生装置における光ヘッド駆動機
構。4. An optical head for recording, reproducing or erasing information on a disc-shaped optical information recording medium, a guide shaft for supporting the optical head and guiding the optical head in its moving direction, and the optical head. And a magnetic circuit having a winding center axis arranged parallel to the moving direction and a magnetic circuit for applying a magnetic field in a direction perpendicular to the moving direction to the driving coil. The circuit includes a permanent magnet having a constant air gap with respect to an outer surface of the drive coil and arranged in parallel with a moving direction of the drive coil, and a first yoke to which one magnetic pole of the permanent magnet is fixed. A magnetic gap that faces the other magnetic pole of the permanent magnet and applies a magnetic field to the drive coil, and is connected to the first yoke at both ends of the first yoke in the moving direction of the optical head. Like a second yoke In the optical head driving mechanism of the optical information recording / reproducing apparatus, the first yoke is laminated by a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium, and the plurality of sheet metal members are formed. At least one of the sheet metal members has a portion having a different shape from the other sheet metal members, and the portion having the different shape is brought into contact with the second yoke to define the position of the second yoke. An optical head drive mechanism in an optical information recording / reproducing apparatus characterized by the above.
録媒体の記録面に対し平行な複数の板金部材により積層
形成し、該複数の板金部材のうち少なくとも１枚の板金
部材が、他の板金部材と形状の異なる部分を有し、該形
状の異なる部分を前記第１のヨークに当接して前記第２
のヨークの位置を規定していることを特徴とする請求項
４に記載の光情報記録再生装置における光ヘッド駆動機
構。5. The second yoke is formed by stacking a plurality of sheet metal members parallel to the recording surface of the disc-shaped optical information recording medium, and at least one sheet metal member of the plurality of sheet metal members is The sheet metal member having a shape different from that of the sheet metal member, and the portion having a shape different from that of the second yoke is brought into contact with the first yoke.
5. The optical head drive mechanism in the optical information recording / reproducing apparatus according to claim 4, wherein the position of the yoke is defined.
角、かつ、該駆動コイルの移動範囲内の第１のヨーク及
び第２のヨークの断面において、前記第２のヨークの前
記円盤状光情報記録媒体の記録面に対し垂直な方向の厚
さは、前記第１のヨークと比べ薄く、断面積はほぼ等し
いことを特徴とする請求項１乃至５いづれかに記載の光
情報記録再生装置における光ヘッド駆動機構。6. The disk shape of the second yoke in a cross section of the first yoke and the second yoke that is perpendicular to the winding center axis of the drive coil and within the moving range of the drive coil. 6. The optical information recording / reproducing apparatus according to claim 1, wherein the thickness of the optical information recording medium in the direction perpendicular to the recording surface is smaller than that of the first yoke, and the cross-sectional areas thereof are substantially equal to each other. Optical head drive mechanism in.
部分は、前記光ヘッドの移動方向に対して直角方向のほ
ぼ全域にわたり、かつ、前記円盤状光情報記録媒体の記
録面に対し垂直な方向の高さが前記第１のヨークとほぼ
同じ高さに形成されていることを特徴とする請求項６に
記載の光情報記録再生装置における光ヘッド駆動機構。7. The connecting portion between the first yoke and the second yoke covers almost the entire area in a direction perpendicular to the moving direction of the optical head, and with respect to the recording surface of the disc-shaped optical information recording medium. 7. The optical head drive mechanism in the optical information recording / reproducing apparatus according to claim 6, wherein the height in the vertical direction is formed to be substantially the same as that of the first yoke.
を磁性材により形成し、該フレーム部材が前記第１のヨ
ークの一部を構成することを特徴とする請求項１乃至７
いづれかに記載の光情報記録再生装置における光ヘッド
駆動機構。8. The frame member of the optical information recording / reproducing apparatus is formed of a magnetic material, and the frame member constitutes a part of the first yoke.
An optical head drive mechanism in any one of the optical information recording / reproducing apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3636795A JPH08235596A (en) | 1995-02-24 | 1995-02-24 | Optical head driving mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3636795A JPH08235596A (en) | 1995-02-24 | 1995-02-24 | Optical head driving mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08235596A true JPH08235596A (en) | 1996-09-13 |
Family
ID=12467873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3636795A Pending JPH08235596A (en) | 1995-02-24 | 1995-02-24 | Optical head driving mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08235596A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998054824A1 (en) * | 1997-05-30 | 1998-12-03 | Iomega Corporation | Laminated steel return path with actuator support features |
| JP2011075674A (en) * | 2009-09-29 | 2011-04-14 | Canon Inc | Lens barrel and imaging apparatus |
-
1995
- 1995-02-24 JP JP3636795A patent/JPH08235596A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6141189A (en) * | 1996-11-15 | 2000-10-31 | Iomega Corporation | Laminated steel return path with actuator support features |
| WO1998054824A1 (en) * | 1997-05-30 | 1998-12-03 | Iomega Corporation | Laminated steel return path with actuator support features |
| JP2011075674A (en) * | 2009-09-29 | 2011-04-14 | Canon Inc | Lens barrel and imaging apparatus |
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