JP2751459B2 - Objective lens drive - Google Patents

Objective lens drive

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Publication number
JP2751459B2
JP2751459B2 JP1241395A JP24139589A JP2751459B2 JP 2751459 B2 JP2751459 B2 JP 2751459B2 JP 1241395 A JP1241395 A JP 1241395A JP 24139589 A JP24139589 A JP 24139589A JP 2751459 B2 JP2751459 B2 JP 2751459B2
Authority
JP
Japan
Prior art keywords
objective lens
support
magnetic circuit
coil
tracking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP1241395A
Other languages
Japanese (ja)
Other versions
JPH03104028A (en
Inventor
幸治 三森
英廣 久米
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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Filing date
Publication date
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Application filed by Sony Corp filed Critical Sony Corp
Priority to JP1241395A priority Critical patent/JP2751459B2/en
Publication of JPH03104028A publication Critical patent/JPH03104028A/en
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Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば光源から出射される光ビームを光デ
ィスクの信号記録面に集束せしめる対物レンズを、フォ
ーカス方向及びトラッキング方向あるいはこれら方向の
何れか一方に駆動変位させる対物レンズ駆動装置に関す
る。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an objective lens which focuses a light beam emitted from a light source on a signal recording surface of an optical disc, for example, in a focus direction and a tracking direction, or in any of these directions. The present invention relates to an objective lens driving device for driving and displacing one side.

〔発明の概要〕[Summary of the Invention]

本発明は対物レンズをフォーカス方向、トラッキング
方向に駆動変位させる対物レンズ駆動装置であって、対
物レンズが取付けられる支持体を、対物レンズの取付部
から離れた重心部を中心として所要角度の放射線方向に
延びる複数の線上において可動支持部材により支持した
ことにより、支持体は重心方向で支持されることにな
り、また支持体は磁石とヨークから構成される閉磁路の
磁気回路とコイルとの協動により移動されて対物レンズ
の光軸と平行な方向、即ちフォーカス方向の移動動作が
安定して行われ、また重心点を中心として回動されるこ
とになって対物レンズをその光軸と直交する方向、即ち
トラッキング方向に安定して移動させることができるよ
うにしたものである。
The present invention relates to an objective lens driving device for driving and displacing an objective lens in a focus direction and a tracking direction, wherein a support on which the objective lens is mounted is moved in a radiation direction at a required angle around a center of gravity separated from a mounting portion of the objective lens. Supported by the movable support member on a plurality of lines extending in the direction of gravity, the support will be supported in the direction of the center of gravity, and the support will cooperate with the coil and the magnetic circuit of the closed magnetic circuit composed of the magnet and the yoke. And the moving operation in the direction parallel to the optical axis of the objective lens, that is, in the focus direction, is performed stably, and the objective lens is rotated about the center of gravity to make the objective lens orthogonal to its optical axis. It is possible to stably move in the direction, that is, the tracking direction.

〔従来の技術〕[Conventional technology]

従来、ディスク回転駆動装置に装着されて回転操作さ
れる光ディスクの信号記録面に光ビームを照射し、上記
光ディスクに記録された情報信号を読み取りあるいは上
記光ディスクに所定の情報信号を書き込む手段として光
学ピックアップ装置が用いられている。この光学ピック
アップ装置には、光源としての半導体レーザから出射さ
れた光ビームを光ディスクの信号記録面に集束せしめる
対物レンズを、磁気的な駆動力をもってフォーカス方向
及びトラッキング方向あるいはこれら方向のいずれか一
方に駆動変位させることによって、上記光ビームが光デ
ィスクの信号記録面に合焦して記録トラックを正確に操
作するようになす対物レンズ駆動装置が配設されてい
る。
2. Description of the Related Art Conventionally, an optical pickup is used as a means for irradiating a signal recording surface of an optical disc mounted on a disc rotation driving device and rotating to irradiate a light beam to read an information signal recorded on the optical disc or write a predetermined information signal on the optical disc. The device is used. In this optical pickup device, an objective lens for focusing a light beam emitted from a semiconductor laser as a light source on a signal recording surface of an optical disk is provided in a focus direction and a tracking direction or one of these directions with a magnetic driving force. There is provided an objective lens driving device for performing the driving displacement so that the light beam is focused on the signal recording surface of the optical disk to accurately operate the recording track.

従来用いられている光学ピックアップ装置に適用され
る対物レンズ駆動装置としては第11図に示すように対物
レンズ(1)を支持すると共にフォーカス制御用駆動コ
イル(2)及びトラッキング制御用駆動コイル(3)を
取付けたボビン(4)を基台(5)上に対設したマグネ
ット(6)(6)間に配して基台(5)上に植立された
取付け板(7)の前面左右部位の上下に平行に片持ち状
に横架したバネ性を有する金属性の支持棒(8)で片持
ち状に支持して構成したものが知られている。そしてこ
の構成のものはボビン(4)がフォーカス制御用駆動コ
イル(2)あるいはトラッキング制御用駆動コイル
(3)に駆動電流を供給することにより支持棒(8)の
弾性変位によって移動され、このボビン(4)に支持さ
れた対物レンズ(1)はフォーカス方向及びトラッキン
グ方向に移動される。
As an objective lens driving device applied to a conventionally used optical pickup device, as shown in FIG. 11, an objective lens (1) is supported and a focus control drive coil (2) and a tracking control drive coil (3) are supported. ) Is mounted between the magnets (6) and (6) opposed to the base (5) and the front left and right sides of the mounting plate (7) planted on the base (5). There has been known a configuration in which a metal support bar (8) having a spring property and supported in a cantilever manner is arranged in a cantilever manner in parallel with the upper and lower parts of the body in a cantilever manner. In this structure, the bobbin (4) is moved by the elastic displacement of the support rod (8) by supplying a drive current to the focus control drive coil (2) or the tracking control drive coil (3). The objective lens (1) supported by (4) is moved in the focus direction and the tracking direction.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

ところで、このように構成される対物レンズ駆動装置
では、対物レンズ(1)を取付けたボビン(4)は取付
け板(7)に対して左右に平行な支持棒(8)で支持さ
れているので、ボビン(4)、取付け板(7)及び左右
の支持棒(8)により平面平行リンク状を構成すること
になって、ボビン(4)を上下方向(フォーカス方向)
に安定して支持するには支持棒(8)に強いバネ性が必
要であり、この支持棒(8)のバネ性を強くするとボビ
ン(4)の横方向(トラッキング方向)の移動が円滑に
行なえなくなる不都合がある。
By the way, in the objective lens driving device configured as described above, the bobbin (4) on which the objective lens (1) is mounted is supported by the support rod (8) parallel to the left and right with respect to the mounting plate (7). , The bobbin (4), the mounting plate (7) and the left and right support rods (8) to form a plane parallel link, so that the bobbin (4) is moved up and down (focus direction).
In order to stably support the support rod (8), the support rod (8) needs to have a strong spring property. If the spring property of the support rod (8) is increased, the bobbin (4) moves smoothly in the lateral direction (tracking direction). There is an inconvenience that cannot be performed.

本発明はかかる点に鑑みてなされたもので、簡単な構
成により、対物レンズを取付ける支持体をフォーカス方
向に安定して支持でき、またトラッキング方向に円滑に
移動できるようにした対物レンズ駆動装置を提供するこ
とを目的とする。
The present invention has been made in view of such a point, and has an objective lens driving device that can stably support a support on which an objective lens is mounted in a focus direction and can move smoothly in a tracking direction with a simple configuration. The purpose is to provide.

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

上記目的を達成するために本発明による対物レンズ駆
動装置は、対物レンズが取り付けられた支持体と、上記
対物レンズの取付部から離れた重心部を中心として、対
物レンズの光軸に対して直交する平面にて所定角度の放
射線方向に延びる複数の線上において上記支持体を支持
する可動支持部材と、磁界を発生する磁石とヨークとか
ら構成される閉磁路の磁気回路と、該磁気回路と協動し
て上記支持体を移動するためのコイルとを備えて構成し
たものである。
In order to achieve the above object, an objective lens driving device according to the present invention includes a support on which an objective lens is mounted, and a center of gravity located away from a mounting portion of the objective lens, which is orthogonal to an optical axis of the objective lens. A movable support member for supporting the support on a plurality of lines extending in a radiation direction at a predetermined angle on a plane to be formed, a magnetic circuit of a closed magnetic circuit including a magnet for generating a magnetic field and a yoke, and cooperation with the magnetic circuit. And a coil for moving the support by moving.

〔作用〕[Action]

このように構成することにより対物レンズを取付ける
支持体は可動支持部材により重心方向に支持され、また
重心を中心として回動されることになり、また、支持体
には磁石とヨークから構成される閉磁路の磁気回路とコ
イルとの協動により上下方向及び回動方向の力が作用す
るので支持体は外界からの吸引力が作用することなく安
定状態で円滑に可動支持部材により上下方向に移動又は
回動することになって対物レンズは正確にフォーかす方
向、又はトラッキング方向に移動される。
With this configuration, the support on which the objective lens is mounted is supported in the direction of the center of gravity by the movable support member, and is rotated about the center of gravity. The support is composed of a magnet and a yoke. The vertical and rotational forces are applied by the cooperation of the coil and the magnetic circuit of the closed magnetic circuit, so that the support moves smoothly in the vertical direction by the movable support member in a stable state without any attractive force from the outside. Alternatively, the objective lens is rotated, so that the objective lens is accurately moved in the forcible direction or the tracking direction.

〔実施例〕〔Example〕

以下、第1図乃至第3図を参照して本発明の一実施例
を説明する。
An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

図において(11)は対物レンズで、支持体(12)に取
付けられ、この支持体(12)は可動支持部材(13)によ
り基台(14)に対して上下及び横方向、即ち対物レンズ
(11)の光軸と平行な方向(フォーカス方向)及び光軸
と直交する方向(トラッキング方向)に移動可能に支持
される。
In the drawing, reference numeral (11) denotes an objective lens, which is attached to a support (12). The support (12) is moved vertically and horizontally with respect to the base (14) by a movable support member (13), that is, the objective lens ( It is movably supported in a direction parallel to the optical axis (focus direction) and in a direction perpendicular to the optical axis (tracking direction).

この支持体(12)のレンズ取付部(12a)から離れた
部位の下面側に凹部(12b)が形成されて閉磁路を構成
する磁気回路(15)が配設されている。この磁気回路
は、ヨーク(16)と磁石片(17)から構成され、ヨーク
(16)は略四辺形板部(16a)の各角部から下方へ突出
する脚片部(16b)を有し、磁石片(17)は円筒状で軸
方向に二分割されている。そしてこのヨーク(16)は支
持体(12)に、その脚片部(16b)を凹部(12a)内に突
出させて固着され、板部(16a)の中央部に下方に向け
て固定されて、凹部(12a)の中央に突出される磁性ピ
ン(18)に磁石片(17)を固着することにより磁気回路
(15)が構成される。
A concave portion (12b) is formed on the lower surface of a portion of the support (12) remote from the lens mounting portion (12a), and a magnetic circuit (15) forming a closed magnetic circuit is provided. This magnetic circuit is composed of a yoke (16) and a magnet piece (17), and the yoke (16) has leg pieces (16b) protruding downward from each corner of the substantially quadrangular plate (16a). The magnet piece (17) is cylindrical and is bisected in the axial direction. The yoke (16) is fixed to the support (12) by projecting its leg (16b) into the recess (12a), and is fixed downward to the center of the plate (16a). A magnetic circuit (15) is formed by fixing a magnet piece (17) to a magnetic pin (18) projecting from the center of the concave portion (12a).

このように構成される磁気回路(15)は基台(14)に
固着された駆動コイル(19)に嵌挿対応されて、電磁駆
動手段が構成される。
The magnetic circuit (15) configured as described above is fitted to the drive coil (19) fixed to the base (14) to form an electromagnetic drive means.

駆動コイル(19)は円筒状に巻回されたフォーカスコ
イル(20)の外周面に4個の略四辺形に巻回されたトラ
ッキングコイル(21)を、前述したヨーク(16)の脚片
部(16b)に対応して接合して構成されている。また基
台(14)には図示せざるも駆動コイル(19)のリード配
線及びその端子が配設されている。
The drive coil (19) includes four tracking coils (21) wound in a substantially quadrilateral shape on the outer peripheral surface of a focus coil (20) wound in a cylindrical shape, and leg portions of the above-described yoke (16). It is configured by joining corresponding to (16b). Although not shown, lead wires for the drive coil (19) and terminals thereof are provided on the base (14).

そして、この構成において支持体(12)は磁気回路
(15)を配設した部位の中心部が重心となり、本例にお
いては、この支持体(12)を基台(14)に対して支持す
る可動支持部材(13)を重心部から所要角度(鋭角例え
ば10゜〜30゜)で放射線方向の延長線上において取付け
てある。
In this configuration, the center of the portion where the magnetic circuit (15) is provided becomes the center of gravity of the support (12), and in this example, the support (12) is supported on the base (14). The movable support member (13) is attached at a required angle (a sharp angle, for example, 10 ° to 30 °) from the center of gravity on an extension line in the radiation direction.

この可動支持部材(13)は、本出願人が先に提案(特
願平1−101258号)したものと同様に一端側で支持体
(12)を支持する上下に平行な左右一対のアーム部(13
a),(13b)とその両アーム部(13a),(13b)の他端
側を連結する連結部(13c)とから構成されており、こ
の両アーム部(13a),(13b)が支持体(12)に、前述
した放射線方向の延長線上に位置して固着、即ち支持体
(12)に対して逆ハ字状に固着されており、連結部(13
c)が基台(14)の取付部(14a)に固定される。
The movable support member (13) is composed of a pair of vertically parallel left and right arm portions that support the support body (12) at one end side in the same manner as previously proposed by the present applicant (Japanese Patent Application No. 1-110258). (13
a), (13b) and a connecting portion (13c) connecting the other ends of both arms (13a) and (13b), and both arms (13a) and (13b) are supported. It is fixed to the body (12) on the above-mentioned extension line in the radiation direction, that is, is fixed to the support (12) in an inverted C-shape.
c) is fixed to the mounting portion (14a) of the base (14).

なお、可動支持部材(13)のアーム部は左右一対に限
ることなく三個以上でもよい。
The number of the arm portions of the movable support member (13) is not limited to a pair on the left and right sides, and may be three or more.

このように構成される本例の対物レンズ駆動装置は、
対物レンズ(11)を取付けた支持体(12)は基台(14)
に対して可動支持部材(13)により上下及び横方向の2
軸方向に移動可能に支持され、駆動コイル(19)のフォ
ーカスコイル(20)に所要のフォーカス電流が供給され
ると磁気回路(15)の磁束と協動して支持体(12)に上
下方向の力が作用し、この支持体は支持部材(13)の上
下動作、即ち垂直方向の揺動により対物レンズ(11)の
光軸と平行な方向に駆動変位されて光ビームのフォーカ
シングが行なわれる。また、トラッキングコイル(21)
に所要のトラッキング電流が供給されると支持体(12)
には磁気回路(15)を中心として回転力が作用すること
になって、第3図に示すように支持部材(13)の夫々の
アーム部(13a),(13b)は横方向に動作、即ち水平方
向に揺動することにより支持体(12)は回動され、この
回動中心から離れた部位に取付けられている対物レンズ
(11)はその光軸と直交する方向に駆動変位されて光ビ
ームのトラッキングが行なわれる。
The objective lens driving device of this example configured as above is
The support (12) to which the objective lens (11) is attached is the base (14)
The upper and lower and horizontal directions are
It is movably supported in the axial direction, and when a required focus current is supplied to the focus coil (20) of the drive coil (19), the support coil (12) moves up and down in cooperation with the magnetic flux of the magnetic circuit (15). This support is driven and displaced in the direction parallel to the optical axis of the objective lens (11) by the vertical movement of the support member (13), that is, the vertical swing, thereby focusing the light beam. . The tracking coil (21)
When the required tracking current is supplied to the support (12)
, A rotational force acts on the magnetic circuit (15), and as shown in FIG. 3, the respective arms (13a) and (13b) of the support member (13) operate in the lateral direction. That is, by swinging in the horizontal direction, the support (12) is rotated, and the objective lens (11) attached to a portion distant from the center of rotation is driven and displaced in a direction orthogonal to the optical axis. Tracking of the light beam is performed.

この動作において、支持体(12)は可動支持部材(1
3)により重心方向に支持されるので安定して支持され
て垂直方向に正確に揺動されると共に、重心部を中心と
して安定して水平方向に回動され、また、支持体(12)
にはヨーク(16)と磁石片(17)から構成される閉磁路
の磁気回路(15)と駆動コイル(19)との協動により上
下方向及び回動方向の力が作用するのでレンズ取付け部
(12a)は外界からの吸引力が作用することなく安定状
態で垂直方向及び水平方向に正確に移動されることにな
ってフォーカシング及びトラッキングが正確かつ確実に
行なえることになる。
In this operation, the support (12) is moved by the movable support member (1).
3) It is supported in the direction of the center of gravity, so that it is stably supported and swings accurately in the vertical direction, and is stably rotated in the horizontal direction around the center of gravity, and the support (12)
The vertical and pivotal forces act on the drive coil (19) in cooperation with the magnetic circuit (15) of the closed magnetic path composed of the yoke (16) and the magnet piece (17). (12a) can be accurately and reliably moved in the vertical and horizontal directions in a stable state without any suction force from the outside, so that focusing and tracking can be performed accurately and reliably.

なお、支持体(12)の材質は非磁性材であれば各種の
ものが使用でき、特に軽量のものを用いることが望まし
い。
As the material of the support (12), various materials can be used as long as it is a non-magnetic material, and it is particularly preferable to use a lightweight material.

また、磁気回路(15)の磁石(17)は二分円筒に限ら
ず、連続した円筒に形成し着磁方向を調整すればよい。
Further, the magnet (17) of the magnetic circuit (15) is not limited to a two-part cylinder, but may be formed in a continuous cylinder and the magnetization direction may be adjusted.

第4図は他の実施例を示し、本例における支持体(2
2)は耐熱性を有し剛性の高いABS樹脂等の合成樹脂によ
り匣体状に形成されてその上面側に対物レンズ(11)が
光軸を上下方向にして嵌合保持され、内部には光源とし
ての半導体レーザ、この半導体レーザからの光ビームを
対物レンズに導くビームスプリッタ及び反射ミラー、光
ディスクから反射された戻りビームをビームスプリッタ
を通して検出するフォトディテクタ等の光検出器等から
成る光学ピックアップユニット(22)が内蔵されてお
り、外周にはフォーカスコイル(24)が巻回され、この
コイル(24)上にその各角部に位置して略角形に巻回さ
れたトラッキングコイル(25)が接合等により取付けら
れている。
FIG. 4 shows another embodiment, in which the support (2
2) is made of a heat-resistant and highly rigid synthetic resin such as ABS resin in the shape of a box, and the objective lens (11) is fitted and held on its upper surface with the optical axis up and down. An optical pickup unit including a semiconductor laser as a light source, a beam splitter and a reflection mirror for guiding a light beam from the semiconductor laser to an objective lens, and a photodetector such as a photodetector for detecting a return beam reflected from an optical disk through the beam splitter ( 22) is built-in, and a focus coil (24) is wound around the outer circumference. A tracking coil (25) wound in a substantially rectangular shape at each corner of the focus coil (24) is joined onto this coil (24). And so on.

また、ヨーク(26)は支持体(22)を所要間隔を於い
て囲繞する大きさの枠体として形成され、この内面側に
はフォーカスコイル(24)及びトラッキングコイル(2
5)に対向して磁石(27)が固着されており、この磁石
(27)とヨーク(26)により磁気回路が構成される。
The yoke (26) is formed as a frame having a size surrounding the support (22) at a required interval, and the focus coil (24) and the tracking coil (2)
A magnet (27) is fixed to face 5), and a magnetic circuit is formed by the magnet (27) and the yoke (26).

そして、基台としてのヨーク(26)に対して支持体
(22)を支持する可動支持部材(28)は前述した実施例
と同様に形成されている。
The movable support member (28) for supporting the support (22) with respect to the yoke (26) as a base is formed in the same manner as in the above-described embodiment.

このように、構成される本例においても、前述した実
施例と同様に支持体(22)は上下及び横方向に動作さ
れ、フォーカシング、トラッキング動作が行なわれる。
In this embodiment thus configured, the support (22) is moved up and down and in the horizontal direction to perform focusing and tracking operations, similarly to the above-described embodiment.

以上、本発明の実施例を説明したが本発明はこの実施
例に限定されるものではなく、本発明の趣旨を逸脱しな
い範囲で種々変更できるものである。
Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be variously modified without departing from the gist of the present invention.

〔発明の効果〕〔The invention's effect〕

以上のように本発明によれば対物レンズを取付けられ
た支持体は可動支持部材によりその重心方向において支
持されるので、フォーカシング方向及びトラッキング方
向に安定して移動され、そして、支持体にはヨークと磁
石から構成される閉磁路の磁気回路とコイルとの協動に
より上下方向及び回動方向の力が作用するので、支持体
は外界からの吸引力が作用することなく円滑に駆動され
て対物レンズのフォーカシング及びトラッキングが正確
に行えて、信頼性が著しく向上される。
As described above, according to the present invention, since the support on which the objective lens is mounted is supported by the movable support member in the direction of the center of gravity, it is stably moved in the focusing direction and the tracking direction, and the support has a yoke. The vertical and rotational forces act by the cooperation of the coil and the magnetic circuit of the closed magnetic path composed of the magnet and the support, so that the support is smoothly driven without the attraction force from the outside and acts on the object. The focusing and tracking of the lens can be performed accurately, and the reliability is significantly improved.

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

第1図は本発明による対物レンズ駆動装置の一例の分解
斜視図、第2図は縦断面図、第3図は動作説明図、第4
図は他例の縦断面図、第5図は従来例の斜視図である。 図中、(11)は対物レンズ、(12),(22)は支持体、
(13),(28)は可動支持部材である。
FIG. 1 is an exploded perspective view of an example of an objective lens driving device according to the present invention, FIG. 2 is a longitudinal sectional view, FIG.
The figure is a longitudinal sectional view of another example, and FIG. 5 is a perspective view of a conventional example. In the figure, (11) is an objective lens, (12) and (22) are supports,
(13) and (28) are movable support members.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】対物レンズが取り付けられた支持体と、 上記対物レンズの取付部から離れた重心部を中心とし
て、対物レンズの光軸に対して直交する平面にて所定角
度の放射線方向に延びる複数の線上において上記支持体
を支持する可動支持部材と、 磁界を発生する磁石とヨークとから構成される閉磁路の
磁気回路と、 該磁気回路と協動して上記支持体を移動するためのコイ
ルとを備えた対物レンズ駆動装置。
1. A support on which an objective lens is mounted, and extending in a radiation direction at a predetermined angle on a plane orthogonal to the optical axis of the objective lens, with a center of gravity at a distance from a mounting portion of the objective lens. A movable support member for supporting the support on a plurality of lines; a magnetic circuit of a closed magnetic path composed of a magnet for generating a magnetic field and a yoke; and a movable circuit for moving the support in cooperation with the magnetic circuit. An objective lens driving device including a coil.
JP1241395A 1989-09-18 1989-09-18 Objective lens drive Expired - Lifetime JP2751459B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1241395A JP2751459B2 (en) 1989-09-18 1989-09-18 Objective lens drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1241395A JP2751459B2 (en) 1989-09-18 1989-09-18 Objective lens drive

Publications (2)

Publication Number Publication Date
JPH03104028A JPH03104028A (en) 1991-05-01
JP2751459B2 true JP2751459B2 (en) 1998-05-18

Family

ID=17073642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1241395A Expired - Lifetime JP2751459B2 (en) 1989-09-18 1989-09-18 Objective lens drive

Country Status (1)

Country Link
JP (1) JP2751459B2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01286126A (en) * 1988-05-13 1989-11-17 Alps Electric Co Ltd Compensation driving device for optical pickup

Also Published As

Publication number Publication date
JPH03104028A (en) 1991-05-01

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