JP3723378B2 - Objective lens drive - Google Patents

Objective lens drive Download PDF

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Publication number
JP3723378B2
JP3723378B2 JP11851999A JP11851999A JP3723378B2 JP 3723378 B2 JP3723378 B2 JP 3723378B2 JP 11851999 A JP11851999 A JP 11851999A JP 11851999 A JP11851999 A JP 11851999A JP 3723378 B2 JP3723378 B2 JP 3723378B2
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Japan
Prior art keywords
objective lens
lens holder
lens
holder
recording medium
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JP11851999A
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JP2000311363A (en
Inventor
千佳士 吉永
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Priority to JP11851999A priority Critical patent/JP3723378B2/en
Priority to KR10-1999-0064307A priority patent/KR100486440B1/en
Publication of JP2000311363A publication Critical patent/JP2000311363A/en
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    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • 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
    • G11B7/0932—Details of sprung supports
    • 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
    • G11B7/0933—Details of stationary parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10227—Other objects, e.g. metallic pieces
    • H05K2201/10265—Metallic coils or springs, e.g. as part of a connection element

Description

【０００１】
【発明の属する技術分野】
本発明は、対物レンズが装着されるレンズホルダーが変位可能に弾性的に支持された対物レンズ駆動装置に関し、特に、信号記録媒体にレンズホルダーが衝突される際に信号記録媒体や対物レンズを保護する構成が施された対物レンズ駆動装置に関する。
【０００２】
【従来の技術】
ディスク等の信号記録媒体に対して光学的に信号の読み取り、あるいは書き込みを行う光学ヘッドにおいては、一般に、対物レンズ駆動装置により対物レンズが装着されるレンズホルダーを駆動して対物レンズによって収束される光ビームの信号記録媒体に対するフォーカス制御及びトラッキング制御を行うようになっており、レンズホルダーが支持ワイヤー等の弾性支持部材によってフレームに対して変位可能に弾性的に支持されている。
【０００３】
その為、フォーカスサーボ導入時における対物レンズの光軸方向への変位や衝撃等によりレンズホルダーが信号記録媒体に衝突し、対物レンズや信号記録媒体を損傷させる危惧がある。
【０００４】
従来、対物レンズ駆動装置としては、対物レンズの周辺にレンズホルダーのどの部位より突端が信号記録媒体に接近するように突部を設け、その突部を信号記録媒体に衝突させることにより対物レンズや信号記録媒体を保護するようにしたものが知られている。
【０００５】
【発明が解決しようとする課題】
ところで、薄型化が図られた光学ヘッドとしては、当然のことながら対物レンズ駆動装置も薄型化が推進されており、このような対物レンズ駆動装置においてはレンズホルダーの厚みの関係からトラッキングコイルの有効長を確保することが困難なためにトラッキングコイルを巻回する範囲を対物レンズの頂点付近まで拡大している。
【０００６】
レンズホルダーには、重量バランスの不均衡やトラッキングコイルの無効部分により発生される駆動力等に起因してトラッキング方向に変位される際に対物レンズの光軸と直交する方向を中心にした有害な回転力が発生する。
【０００７】
これによりレンズホルダーが傾いて変位されると、対物レンズが配置されるレンズホルダーの中央よりレンズホルダーの両脇部分が信号記録媒体に接近することになる。
【０００８】
特に、先に説明した薄型化が図られた光学ヘッドの対物レンズ駆動装置においては、トラッキングコイルを巻回するレンズホルダーの両脇部分の高さが高くなっており、対物レンズの周囲に突部を設けてもその突部の高さを信号記録媒体との確保する距離の点からむやみに高く出来ないので、そのレンズホルダーの両脇部分で信号記録媒体に衝突するという問題が発生した。
【０００９】
【課題を解決するための手段】
本発明は、レンズホルダーのフォーカスコイルが巻回されるボビン部に前記フォーカスコイルの巻回幅を規制するべく上下両側にリム部が形成され、レンズホルダーが対物レンズの光軸方向に変位された際の対物レンズ及び信号記録媒体の保護を行う保護部材を少なくともレンズホルダーの対物レンズを挟んだ両側における前記上側のリム部に係止して前記保護部材をレンズホルダーの各側面にそれぞれ設置し、かつ、前記保護部材を緩衝体により構成し、レンズホルダーを変位可能に弾性的に支持するべくレンズホルダーの各側に配置される複数の支持ワイヤーの少なくとも一部に前記保護部材を接触させて配置する。これによりレンズホルダーの各側面にそれぞれ設置する保護部材を前記上側のリム部により高さ方向の位置決めが行われるようにし、信号記録媒体に衝突される部分を保護部材として対物レンズ及び信号記録媒体を保護するようにすると共に、前記保護部材に接触されて配置される支持ワイヤーを制振させるようにしている。
【００１０】
【実施例】
図１は本発明に係る対物レンズ駆動装置の一実施例を示す平面図、図２は図１に示す対物レンズ駆動装置の側面からの端面図である。
【００１１】
同図において、１は中央に対物レンズ２が装着されたレンズホルダーであり、このレンズホルダー１は対物レンズ２が装着される位置を挟む両側に対物レンズ２の光軸を通る直線に対して線対称となる位置が第１ボビン部及び第２ボビン部となり、その第１ボビン部にフォーカスコイル３ａ及びトラッキングコイル４ａ，４ｂが、第２ボビン部にフォーカスコイル３ｂ及びトラッキングコイル４ｃ，４ｄがそれぞれ対応して巻回されるようになっている。
【００１２】
その為、レンズホルダー１の対物レンズ２が装着される中央部分の下方は、前記第１及び第２ボビン部間が空間になっている。
【００１３】
フォーカスコイル３ａ及び３ｂは一本のコイル線材を連続してそれぞれ第１及び第２ボビン部に対物レンズ２の光軸方向に巻回中心軸を有して略矩形状に巻回されており、互いに直列の接続されている。
【００１４】
また、トラッキングコイル４ａ，４ｂ及び４ｃ，４ｄは一本のコイル線材を連続してそれぞれ一つのボビン部に対して２つずつ対を成して対物レンズ２の光軸方向と直交する巻回中心軸を有して略矩形状に巻回されており、互いに直列に接続されている。
【００１５】
５及び６はレンズホルダー１の第１ボビン部を挟んで互いに同一磁極の一方の磁極面（Ｎ極）が対向するべくそれぞれ配置された第１の一対の永久磁石、７及び８はレンズホルダー１の第２ボビン部を挟んで互いに同一磁極の一方の磁極面（Ｎ極）が対向するべくそれぞれ配置された第２の一対の永久磁石である。
【００１６】
前記第１の永久磁石５及び６にはそれぞれ他方の磁極面（Ｓ極）にそれぞれ外部ヨーク９及び１０が付設されており、前記第２の永久磁石７及び８にはそれぞれ他方の磁極面（Ｓ極）にそれぞれ外部ヨーク１１及び１２が付設されている。
【００１７】
また、前記第１の永久磁石５及び６のそれぞれ一方の磁極面（Ｎ極）には、レンズホルダー１の各永久磁石５及び６の間の中央部分に形成される孔１３内に配置される内部ヨーク１４が対向されており、前記第１の永久磁石５及び６と外部ヨーク９及び１０と内部ヨーク１４とは永久磁石５の一方の磁極面と内部ヨーク１４との間、及び永久磁石６の一方の磁極面と内部ヨーク１４との間にそれぞれ磁気空隙を形成する第１磁気回路部を構成する。
【００１８】
また、前記第２の永久磁石７及び８のそれぞれ一方の磁極面（Ｎ極）には、レンズホルダー１の各永久磁石７及び８の間の中央部分に形成される孔１５内に配置される内部ヨーク１６が対向されており、前記第２の永久磁石７及び８と外部ヨーク１１及び１２と内部ヨーク１６とは永久磁石７の一方の磁極面と内部ヨーク１６との間、及び永久磁石８の一方の磁極面と内部ヨーク１６との間にそれぞれ磁気空隙を形成する第２磁気回路部を構成する。
【００１９】
第１磁気回路部と第２磁気回路部との間は、対物レンズ２の光軸と直交する方向から入射される光ビームを対物レンズ２に向けるべく反射させる反射ミラー（図示せず）が設置される空間となる。
【００２０】
レンズホルダー１の周囲には、外部ヨーク９及び１０、外部ヨーク１０及び１１、外部ヨーク１１及び１２、外部ヨーク１２及び９をそれぞれ連結してレンズホルダー１を囲うフレーム１７ａ〜１７ｄが構成され、フレーム１７ｄからは取付部１８が延設されてその取付部１８で対物レンズ駆動機構が対物レンズ２を除く光学素子が組み込まれる光学ハウジング（図示せず）に取り付けられる。
【００２１】
前記取付部１８には配線基板１９が固定され、その配線基板１９に各一方の端部がハンダ付け固定された４本の支持ワイヤー２０は各他方の端部でレンズホルダー１にハンダ付けにより固定され、それによりレンズホルダー１は各支持ワイヤー２０により変位可能に弾性的に支持されている。
【００２２】
この場合、各支持ワイヤー２０は対物レンズ２を挟んでレンズホルダー１の両側にそれぞれ上下２本が配置されて互いに平行に架設される。そして、レンズホルダー１の各側に配置されるそれぞれ２本の支持ワイヤー２０はそれぞれレンズホルダー１の各側面に取り付けられた各固定板２１及び２２に分かれてその他端がそれぞれハンダ付けされて固定される。
【００２３】
前記各支持ワイヤー２０は、配線基板１９に固定された補助部材２３に形成された溝内にそれぞれ配置され、それらの溝内に充填されるダンプ剤により制振されている。
【００２４】
このように構成される対物レンズ駆動装置は、フォーカシングコイル３ａ及び３ｂに直列にフォーカス制御信号を供給することによりそのフォーカス制御信号に応じてレンズホルダー１を介して対物レンズ２をフォーカス方向に駆動することが出来、トラッキングコイル４ａ乃至４ｄに直列にトラッキング制御信号を供給することによりそのトラッキング制御信号に応じてレンズホルダー１を介して対物レンズ２をトラッキング方向に駆動することが出来る。
【００２５】
次に、このように構成される対物レンズ駆動装置において、本発明の主要構成について図１、図２及びレンズホルダー部分を示した展開斜視図の図３を用いて更に詳細に説明する。
【００２６】
レンズホルダー１の第１ボビン部におけるフォーカスコイル３ａが巻回される部分及び第２ボビン部におけるフォーカスコイル３ｂが巻回される部分には、それぞれ巻回幅を規制するべく上下にリム部が形成され、レンズホルダー１の各側面側のそれぞれの辺の上下各リム部２４ａ，２４ｂ及び２５ａ，２５ｂに切り欠きが形成され、それらの切り欠きの間にはそれぞれフォーカシングコイル３ａ及び３ｂの巻回始端及び巻回終端とトラッキングコイル４ａ〜４ｄの巻回始端及び巻回終端とがそれぞれ独立して絡げられる係止部２６ａ〜２６ｄがレンズホルダー１と一体的に形成されている。
【００２７】
支持ワイヤー２０がハンダ付けされる固定板２１及び２２は、それぞれ対応する切り欠き及び各リム部２４ａ，２４ｂ及び２５ａ，２５ｂに嵌合されてレンズホルダー１の各側面に取り付けられる。
【００２８】
各支持ワイヤー２０が各固定板２１及び２２にハンダ付けにより固定される際に各係止部２６ａ〜２６ｄに絡げられた各巻回端部が一緒にハンダ付けされることによりフォーカシングコイル３ａ，３ｂ及びトラッキングコイル４ａ〜４ｄの各巻回端部はそれぞれ所定の支持ワイヤー２０に接続される。
【００２９】
また、レンズホルダー１の各側面には、それぞれナイロン樹脂により成形される保護部材２７及び２８が装着される。
【００３０】
一方の保護部材２７はリム部２４ａの両角と上側の係止部２６ａの３点により、他方の保護部材２８はリム部２５ａの両角と上側の係止部２６ｃの３点によりそれぞれ係止され、接着剤によりレンズホルダー１の各側面に設置される。
【００３１】
この場合、各リム部２４ａ及び２５ａがそれぞれ保護部材２７及び２８の高さ方向の位置決めを行う位置決め部の働きをし、これにより保護部材２７及び２８はレンズホルダー１における高さ方向の設置位置が確定され、各保護部材２７及び２８の頂点が確実にレンズホルダー１の他の部位より高くなると共に、信号記録媒体との必要な距離が確保される。
【００３２】
このように前記各保護部材２７及び２８がレンズホルダー１の各側面に設置されることによりレンズホルダー１が傾いて変位された場合であってもレンズホルダー１が信号記録媒体に衝突する際には保護部材２７及び２８のいずれかが衝突され、対物レンズ２や信号記録媒体が保護される。
【００３３】
また、上側の各支持ワイヤー２０の一部は保護部材２７及び２８に接触されて配置されるが、保護部材２７及び２８は緩衝体であるので、保護部材２７及び２８には各上側の支持ワイヤー２０を制振させる作用がある。
【００３４】
【発明の効果】
以上述べた如く、本発明は、レンズホルダーの対物レンズを挟んだ両側におけるレンズホルダーのフォーカスコイルが巻回されるボビン部の上側のリム部に保護部材を係止して該保護部材をレンズホルダーの各側面にそれぞれ設置するようにしているので、前記上側のリム部を利用してレンズホルダーの各側面に高さ方向の位置決めを行ってそれぞれ各保護部材が設置され、保護部材により対物レンズ及び信号記録媒体の保護を図ることが出来、この場合、レンズホルダーが傾いて変位される際に効果的に対物レンズ及び信号記録媒体の保護を図ることが出来、また、特に前記保護部材を緩衝体により構成し、レンズホルダーの各側に配置される複数の支持ワイヤーの少なくとも一部に保護部材を接触させて配置するようにしているので、保護部材が有する制振作用により保護部材に接触する支持ワイヤーを制振させることが期待できる。
【図面の簡単な説明】
【図１】本発明に係る対物レンズ駆動装置の一実施例を示す平面図である。
【図２】図１に示す対物レンズ駆動装置の側面からの端面図である。
【図３】本発明の主要構成であるレンズホルダー部分を示した展開斜視図である。
【符号の説明】
１ レンズホルダー
２ 対物レンズ
３ａ，３ｂ フォーカシングコイル
４ａ，４ｂ，４ｃ，４ｄ トラッキングコイル
２０ 支持ワイヤー
２１，２２ 固定板
２４ａ，２４ｂ，２５ａ，２５ｂ リム部
２７，２８ 保護部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an objective lens driving device in which a lens holder on which an objective lens is mounted is elastically supported so as to be displaceable, and in particular, protects a signal recording medium and an objective lens when the lens holder collides with a signal recording medium. The present invention relates to an objective lens driving device provided with the above configuration.
[0002]
[Prior art]
In an optical head that optically reads or writes a signal on a signal recording medium such as a disk, generally, a lens holder on which the objective lens is mounted is driven by an objective lens driving device and converged by the objective lens. The focus control and tracking control of the signal recording medium of the light beam is performed, and the lens holder is elastically supported so as to be displaceable with respect to the frame by an elastic support member such as a support wire.
[0003]
Therefore, there is a risk that the lens holder will collide with the signal recording medium due to displacement or impact of the objective lens in the optical axis direction when the focus servo is introduced, and the objective lens or the signal recording medium may be damaged.
[0004]
Conventionally, as an objective lens driving device, a projection is provided around the objective lens so that the tip of the lens holder approaches the signal recording medium from any part of the lens holder, and the projection is made to collide with the signal recording medium. A recording medium that protects a signal recording medium is known.
[0005]
[Problems to be solved by the invention]
By the way, as an optical head that has been reduced in thickness, it is a matter of course that the objective lens driving device is also being reduced in thickness. In such an objective lens driving device, the tracking coil is effective due to the thickness of the lens holder. Since it is difficult to ensure the length, the range in which the tracking coil is wound is expanded to the vicinity of the vertex of the objective lens.
[0006]
The lens holder has a harmful effect centered on the direction orthogonal to the optical axis of the objective lens when displaced in the tracking direction due to imbalance in weight balance or driving force generated by the invalid portion of the tracking coil. A rotational force is generated.
[0007]
As a result, when the lens holder is tilted and displaced, both side portions of the lens holder approach the signal recording medium from the center of the lens holder where the objective lens is disposed.
[0008]
In particular, in the objective lens driving device for an optical head that has been thinned as described above, the heights of both side portions of the lens holder around which the tracking coil is wound are high, and a protrusion is formed around the objective lens. However, the height of the protrusion cannot be increased unnecessarily from the standpoint of the distance to be secured with the signal recording medium. Therefore, there has been a problem that the both sides of the lens holder collide with the signal recording medium.
[0009]
[Means for Solving the Problems]
In the present invention, rim portions are formed on both the upper and lower sides of the bobbin portion around which the focus coil of the lens holder is wound so as to restrict the winding width of the focus coil, and the lens holder is displaced in the optical axis direction of the objective lens. The protective member for protecting the objective lens and the signal recording medium at the time is locked to the upper rim portion on both sides of the objective lens of at least the lens holder, and the protective member is installed on each side of the lens holder, In addition, the protection member is constituted by a buffer, and the protection member is arranged in contact with at least a part of a plurality of support wires arranged on each side of the lens holder so as to elastically support the lens holder in a displaceable manner. To do. Thus, the protective member installed on each side surface of the lens holder is positioned in the height direction by the upper rim portion, and the objective lens and the signal recording medium are used with the portion colliding with the signal recording medium as the protective member. While protecting, the support wire arrange | positioned in contact with the said protection member is damped.
[0010]
【Example】
FIG. 1 is a plan view showing an embodiment of an objective lens driving device according to the present invention, and FIG. 2 is an end view from the side of the objective lens driving device shown in FIG.
[0011]
In the figure, reference numeral 1 denotes a lens holder having an objective lens 2 mounted in the center. The lens holder 1 is a line with respect to a straight line passing through the optical axis of the objective lens 2 on both sides of the position where the objective lens 2 is mounted. The symmetrical positions are the first bobbin portion and the second bobbin portion, and the focus coil 3a and tracking coils 4a and 4b correspond to the first bobbin portion, and the focus coil 3b and tracking coils 4c and 4d correspond to the second bobbin portion, respectively. Then it is designed to be wound.
[0012]
Therefore, a space between the first and second bobbin portions is a space below the central portion where the objective lens 2 of the lens holder 1 is mounted.
[0013]
The focus coils 3a and 3b are wound in a substantially rectangular shape with a central axis wound in the optical axis direction of the objective lens 2 on the first and second bobbin portions, respectively, continuously from one coil wire. They are connected in series with each other.
[0014]
In addition, the tracking coils 4a, 4b and 4c, 4d are each a winding center perpendicular to the optical axis direction of the objective lens 2 by forming a pair of coil wires in succession for each bobbin portion. It has a shaft, is wound in a substantially rectangular shape, and is connected to each other in series.
[0015]
Reference numerals 5 and 6 denote a first pair of permanent magnets arranged so that one magnetic pole face (N pole) of the same magnetic pole faces each other across the first bobbin portion of the lens holder 1, and 7 and 8 denote the lens holder 1. And a second pair of permanent magnets arranged so that one magnetic pole face (N pole) of the same magnetic pole faces each other across the second bobbin portion.
[0016]
The first permanent magnets 5 and 6 are respectively provided with external yokes 9 and 10 on the other magnetic pole surface (S pole), respectively, and the second permanent magnets 7 and 8 are respectively provided with the other magnetic pole surface ( External yokes 11 and 12 are respectively attached to the S pole).
[0017]
Further, each of the first permanent magnets 5 and 6 has a magnetic pole face (N pole) disposed in a hole 13 formed in a central portion between the permanent magnets 5 and 6 of the lens holder 1. An inner yoke 14 is opposed to the first permanent magnets 5 and 6, the outer yokes 9 and 10, and the inner yoke 14 between one magnetic pole surface of the permanent magnet 5 and the inner yoke 14, and the permanent magnet 6. A first magnetic circuit portion is formed in which a magnetic gap is formed between one of the magnetic pole surfaces and the inner yoke 14.
[0018]
Further, one magnetic pole surface (N pole) of each of the second permanent magnets 7 and 8 is disposed in a hole 15 formed in a central portion between the permanent magnets 7 and 8 of the lens holder 1. An internal yoke 16 is opposed, and the second permanent magnets 7 and 8, the external yokes 11 and 12, and the internal yoke 16 are between one magnetic pole surface of the permanent magnet 7 and the internal yoke 16, and the permanent magnet 8. A second magnetic circuit portion is formed in which a magnetic gap is formed between one of the magnetic pole surfaces and the inner yoke 16.
[0019]
Between the first magnetic circuit unit and the second magnetic circuit unit, a reflection mirror (not shown) that reflects a light beam incident from a direction orthogonal to the optical axis of the objective lens 2 to be directed toward the objective lens 2 is installed. Space.
[0020]
Around the lens holder 1, there are formed frames 17a to 17d surrounding the lens holder 1 by connecting the outer yokes 9 and 10, the outer yokes 10 and 11, the outer yokes 11 and 12, and the outer yokes 12 and 9, respectively. An attachment portion 18 extends from 17d, and the objective lens drive mechanism is attached to an optical housing (not shown) in which optical elements excluding the objective lens 2 are incorporated.
[0021]
A wiring board 19 is fixed to the mounting portion 18, and four support wires 20 each having one end soldered to the wiring board 19 are fixed to the lens holder 1 by soldering at the other end. Thereby, the lens holder 1 is elastically supported by the support wires 20 so as to be displaceable.
[0022]
In this case, two support wires 20 are arranged on both sides of the lens holder 1 with the objective lens 2 interposed therebetween, and are laid in parallel to each other. Each of the two support wires 20 arranged on each side of the lens holder 1 is divided into fixing plates 21 and 22 attached to the respective side surfaces of the lens holder 1, and the other ends thereof are soldered and fixed. The
[0023]
Each of the support wires 20 is disposed in a groove formed in the auxiliary member 23 fixed to the wiring board 19 and is damped by a dumping agent filled in the grooves.
[0024]
The objective lens driving device configured as described above drives the objective lens 2 in the focus direction via the lens holder 1 according to the focus control signal by supplying the focus control signal in series to the focusing coils 3a and 3b. Further, by supplying a tracking control signal in series to the tracking coils 4a to 4d, the objective lens 2 can be driven in the tracking direction via the lens holder 1 in accordance with the tracking control signal.
[0025]
Next, in the objective lens driving apparatus configured as described above, the main configuration of the present invention will be described in more detail with reference to FIGS. 1 and 2 and FIG.
[0026]
A rim portion is formed at the top and bottom of the portion of the first bobbin portion of the lens holder 1 where the focus coil 3a is wound and the portion of the second bobbin portion where the focus coil 3b is wound to restrict the winding width. Notches are formed in the upper and lower rim portions 24a, 24b and 25a, 25b on the respective sides on the side surfaces of the lens holder 1, and the winding start ends of the focusing coils 3a and 3b are respectively provided between the notches. The lens holder 1 is integrally formed with locking portions 26a to 26d in which the winding end and the winding start end and winding end of the tracking coils 4a to 4d are independently wound.
[0027]
The fixing plates 21 and 22 to which the support wire 20 is soldered are respectively fitted to the corresponding notches and the rim portions 24a, 24b and 25a, 25b and attached to the respective side surfaces of the lens holder 1.
[0028]
When the support wires 20 are fixed to the fixing plates 21 and 22 by soldering, the winding end portions entangled with the locking portions 26a to 26d are soldered together, thereby focusing coils 3a and 3b. And each winding end part of tracking coils 4a-4d is connected to predetermined support wire 20, respectively.
[0029]
Further, protective members 27 and 28 formed of nylon resin are attached to the respective side surfaces of the lens holder 1.
[0030]
One protective member 27 is locked by the three points of the rim portion 24a and the upper locking portion 26a, and the other protective member 28 is locked by the corners of the rim portion 25a and the upper locking portion 26c. It is installed on each side of the lens holder 1 with an adhesive.
[0031]
In this case, each of the rim portions 24a and 25a serves as a positioning portion for positioning the protective members 27 and 28 in the height direction, so that the protective members 27 and 28 are positioned in the lens holder 1 in the height direction. As a result, the apexes of the protective members 27 and 28 are surely higher than other portions of the lens holder 1 and a necessary distance from the signal recording medium is secured.
[0032]
As described above, when the protective members 27 and 28 are installed on the side surfaces of the lens holder 1, the lens holder 1 collides with the signal recording medium even when the lens holder 1 is tilted and displaced. One of the protection members 27 and 28 collides, and the objective lens 2 and the signal recording medium are protected.
[0033]
Moreover, although a part of each upper support wire 20 is disposed in contact with the protection members 27 and 28, the protection members 27 and 28 are buffer bodies. 20 has the effect of damping the vibration.
[0034]
【The invention's effect】
As described above, according to the present invention, the protective member is locked to the rim portion on the upper side of the bobbin portion around which the focus coil of the lens holder is wound on both sides of the objective lens of the lens holder. Since each of the protection members is installed by positioning in the height direction on each side surface of the lens holder using the upper rim portion, the protective lens is installed by the protection member. The signal recording medium can be protected. In this case, when the lens holder is tilted and displaced, the objective lens and the signal recording medium can be effectively protected. And the protective member is arranged in contact with at least a part of the plurality of support wires arranged on each side of the lens holder. The support wire in contact with the protective member by the damping action provided in the member can be expected to damping.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of an objective lens driving device according to the present invention.
FIG. 2 is an end view from the side of the objective lens driving device shown in FIG. 1;
FIG. 3 is a developed perspective view showing a lens holder portion which is a main configuration of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lens holder 2 Objective lens 3a, 3b Focusing coil 4a, 4b, 4c, 4d Tracking coil 20 Support wire 21, 22 Fixing plate 24a, 24b, 25a, 25b Rim part 27, 28 Protection member

Claims (1)

対物レンズが装着されたレンズホルダーを対物レンズの光軸方向に駆動して対物レンズによって収束される光ビームのフォーカス制御を行う対物レンズ駆動装置であって、レンズホルダーのフォーカスコイルが巻回されるボビン部に前記フォーカスコイルの巻回幅を規制するべく上下両側にリム部が形成され、レンズホルダーが対物レンズの光軸方向に変位された際の対物レンズ及び信号記録媒体の保護を行う保護部材を少なくともレンズホルダーの対物レンズを挟んだ両側における前記上側のリム部に係止して前記保護部材をレンズホルダーの各側面にそれぞれ設置し、かつ、前記保護部材を緩衝体により構成し、レンズホルダーを変位可能に弾性的に支持するべくレンズホルダーの各側に配置される複数の支持ワイヤーの少なくとも一部に前記保護部材を接触させて配置するようにしたことを特徴とする対物レンズ駆動装置。An objective lens driving device that drives a lens holder equipped with an objective lens in the optical axis direction of the objective lens to perform focus control of a light beam converged by the objective lens, in which a focus coil of the lens holder is wound Protective members for protecting the objective lens and the signal recording medium when the lens holder is displaced in the optical axis direction of the objective lens, with rim portions formed on the upper and lower sides to restrict the winding width of the focus coil on the bobbin portion At least on both sides of the objective lens of the lens holder, the protective member is installed on each side of the lens holder , and the protective member is constituted by a buffer, and the lens holder At least some of the plurality of support wires disposed on each side of the lens holder to elastically support the lens An objective lens driving apparatus is characterized in that as placed in contact with the protective member.
JP11851999A 1999-04-26 1999-04-26 Objective lens drive Expired - Fee Related JP3723378B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11851999A JP3723378B2 (en) 1999-04-26 1999-04-26 Objective lens drive
KR10-1999-0064307A KR100486440B1 (en) 1999-04-26 1999-12-29 Object lens driving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11851999A JP3723378B2 (en) 1999-04-26 1999-04-26 Objective lens drive

Publications (2)

Publication Number Publication Date
JP2000311363A JP2000311363A (en) 2000-11-07
JP3723378B2 true JP3723378B2 (en) 2005-12-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP11851999A Expired - Fee Related JP3723378B2 (en) 1999-04-26 1999-04-26 Objective lens drive

Country Status (2)

Country Link
JP (1) JP3723378B2 (en)
KR (1) KR100486440B1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0748266B2 (en) * 1992-08-31 1995-05-24 ソニー株式会社 Objective lens drive

Also Published As

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KR100486440B1 (en) 2005-04-29
KR20000067846A (en) 2000-11-25
JP2000311363A (en) 2000-11-07

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