JP2709603B2 - Objective lens drive - Google Patents

Objective lens drive

Info

Publication number
JP2709603B2
JP2709603B2 JP63153623A JP15362388A JP2709603B2 JP 2709603 B2 JP2709603 B2 JP 2709603B2 JP 63153623 A JP63153623 A JP 63153623A JP 15362388 A JP15362388 A JP 15362388A JP 2709603 B2 JP2709603 B2 JP 2709603B2
Authority
JP
Japan
Prior art keywords
objective lens
lens holder
support
rubber
support shaft
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 - Fee Related
Application number
JP63153623A
Other languages
Japanese (ja)
Other versions
JPH01320651A (en
Inventor
実透 矢部
昭 橋本
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP63153623A priority Critical patent/JP2709603B2/en
Publication of JPH01320651A publication Critical patent/JPH01320651A/en
Application granted granted Critical
Publication of JP2709603B2 publication Critical patent/JP2709603B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、対物レンズ駆動装置に関するもので、更に
詳しくは、光学式ディスクにおける光スポットのトラッ
クずれや焦点ずれを制御する再生装置又は、記録装置の
対物レンズ駆動装置に関するものである。
Description: BACKGROUND OF THE INVENTION The present invention relates to an objective lens driving device, and more particularly, to a reproducing device or a recording device for controlling a track shift or a focus shift of a light spot on an optical disc. The present invention relates to an objective lens driving device of the device.

[従来の技術] 第2図は従来の対物レンズ駆動装置の平面図、第3図
は第2図のX−Y線に沿う断面図である。図において、
(1)は対物レンズ、(2)はカウンターウェイト、
(3)はレンズホルダで中心部は、可動軸受(4)を介
して支軸(5)に回動自在に軸止されている。(6)は
レンズホルダ(3)を保持する支持ゴム、(7)は焦点
制御用永久磁石、(8a),(8b)はトラック制御用永久
磁石、(9)は支軸(5)と焦点制御用永久磁石(7)
を保持するヨーク、(10)は焦点制御用コイル、(11
a),(11b)はトラック制御コイル、(12a),(12b)
はトラック制御用永久磁石(8a),(8b)の保持を兼ね
たヨークである。これらの各部材によって、レンズホル
ダ(3)を回転させ、軸線方向に駆動する駆動装置を構
成している。更に(13a),(13b),(13c),(13d)
は支持ゴム(6)を固定する支持ゴム固定部で、ヨーク
(12a),(12b)とともに固定台(14)と一体に形成さ
れている。また固定台(14)には穴(15)が設けられて
おり、この穴(15)を抜けて、レーザ光が通るようにな
っている。
[Prior Art] FIG. 2 is a plan view of a conventional objective lens driving device, and FIG. 3 is a sectional view taken along line XY of FIG. In the figure,
(1) is an objective lens, (2) is a counterweight,
(3) is a lens holder, the center of which is rotatably fixed to a support shaft (5) via a movable bearing (4). (6) is a supporting rubber for holding the lens holder (3), (7) is a permanent magnet for focus control, (8a) and (8b) are permanent magnets for track control, and (9) is a support shaft (5) and a focus. Permanent magnet for control (7)
(10) is a focus control coil, (11)
a) and (11b) are track control coils, (12a) and (12b)
Is a yoke which also holds the track control permanent magnets (8a) and (8b). These members constitute a driving device that rotates the lens holder (3) and drives the lens holder in the axial direction. (13a), (13b), (13c), (13d)
Is a supporting rubber fixing portion for fixing the supporting rubber (6), and is formed integrally with the fixing base (14) together with the yokes (12a) and (12b). Further, a hole (15) is provided in the fixing base (14), and the laser light passes through the hole (15).

次にこの作用を説明する。 Next, this operation will be described.

上述のように構成された従来の対物レンズ駆動装置で
は、支軸(5)に筒状の可動軸受け(4)が嵌着されて
いるので、レンズホルダ(3)は支軸(5)の軸線方
向、即ち第3図の矢印(A)方向に摺動自在に支持され
ると共に、第2図の矢印(B)に示す方向に支軸(5)
を中心として回転自在となっている。ここで、焦点制御
用コイル(10)に所要の電流を流すと、レンズホルダ
(3)を矢印(A)方向に移動させて焦点制御を行うこ
とができる。また、対物レンズ(1)は支軸(5)より
所定距離離れた位置でレンズホルダ(3)に固定されて
いるので、トラック制御用コイル(11a),(11b)に所
要の電流を流すことにより、対物レンズ(1)を矢印
(B)方向に回動させてトラック制御を行うことができ
る。また支持ゴム(6)は、矢印(B)方向の中立位置
保持機能を備えているので、トラック制御用コイル(11
a),(11b)への電流通電解除時には、対物レンズ
(1)を中立位置に復帰させる。
In the conventional objective lens driving device configured as described above, since the cylindrical movable bearing (4) is fitted to the support shaft (5), the lens holder (3) is connected to the axis of the support shaft (5). The support shaft (5) is slidably supported in the direction shown by the arrow (A) in FIG. 3, and in the direction shown by the arrow (B) in FIG.
It is freely rotatable around. Here, when a required current flows through the focus control coil (10), the focus control can be performed by moving the lens holder (3) in the direction of the arrow (A). Also, since the objective lens (1) is fixed to the lens holder (3) at a position away from the support shaft (5) by a predetermined distance, it is necessary to supply a required current to the track control coils (11a) and (11b). Thus, the track control can be performed by rotating the objective lens (1) in the direction of the arrow (B). Since the support rubber (6) has a neutral position holding function in the direction of the arrow (B), the track control coil (11
a) When the current supply to (11b) is released, the objective lens (1) is returned to the neutral position.

[発明が解決しようとする課題] 従来の対物レンズ駆動装置は以上のように構成されて
おり、支持ゴム(6)は複数の支持ゴム固定部(13
a),(13b),(13c),(13d)にまたがり取りつけら
れている。このような状態で対物レンズ(1)は、第4
図に示すようにコリメート光(16)のほぼ中心を中立点
として固定されることが望ましいのであるが、支持ゴム
(6)がシリコンゴム等の弾性に富む材料で作られてい
るため、寸法精度、取付精度の管理が困難であって、第
5図に示すように対物レンズ(1)はコリメート光(1
6)の中心からずれた位置を中立点として固定されるこ
とがある。このように、対物レンズ(1)がコリメート
光(16)の中心かからずれた位置を中立点として固定さ
れると、対物レンズ(1)の有効径がコリメート光(1
6)からはみ出してしまうため、集光性能の劣化、記録
・再生信号の振幅の低下、あるいは対物レンズ(1)が
第2図の矢印(B)方向に追従したときのジッタ,焦点
制御用センサー感度及びトラック制御用センサー感度が
中立点を基準にすると、非対称となるという問題が生ず
る。
[Problem to be Solved by the Invention] The conventional objective lens driving device is configured as described above, and the supporting rubber (6) is provided with a plurality of supporting rubber fixing portions (13).
a), (13b), (13c), and (13d). In such a state, the objective lens (1)
As shown in the figure, it is desirable that the collimated light (16) be fixed with the center substantially at the neutral point. However, since the supporting rubber (6) is made of an elastic material such as silicone rubber, the dimensional accuracy is reduced. In addition, it is difficult to control the mounting accuracy, and as shown in FIG.
In some cases, the position offset from the center of 6) is fixed as the neutral point. As described above, when the position of the objective lens (1) deviated from the center of the collimated light (16) is fixed as a neutral point, the effective diameter of the objective lens (1) becomes larger than that of the collimated light (1).
6), the light condensing performance is deteriorated, the amplitude of the recording / reproducing signal is reduced, or the jitter and focus control sensor when the objective lens (1) follows the direction of the arrow (B) in FIG. If the sensitivity and the track control sensor sensitivity are based on the neutral point, there is a problem that the sensitivity is asymmetric.

本発明は、かかる問題点を解決するためになされたも
ので、トラック制御用コイルへの電流通電解除時に、対
物レンズの中立位置をコリメート光の中心に低量的に調
整すことが出来る機構を備えた対物レンズ駆動装置を得
ることを目的とする。
The present invention has been made to solve such a problem, and has a mechanism capable of adjusting the neutral position of the objective lens to the center of the collimated light in a small amount when the current supply to the track control coil is released. It is an object to obtain an objective lens driving device provided with the same.

[課題を解決するための手段] 本発明に係る対物レンズ駆動装置は、対物レンズを保
持し、中心部が支軸に回動自在に軸止されたレンズホル
ダと、該レンズホルダを弾性的に保持する支持ゴムと、
前記支軸を支持する固定台と、該固定台に立設され前記
支持ゴムを保持する複数の支持ゴム固定部と、前記レン
ズホルダを回転かつ軸線方向に上下動させる駆動手段と
を備えたものにおいて、前記複数の支持ゴム固定部の少
なくとも一部を、一端が前記固定台に回動可能に支持さ
れ、他端に設けた偏心軸を前記支持ゴム固定部に嵌入し
た偏心軸機構とし、前記偏心軸を回転することにより前
記支軸を中心に前記対物レンズの位置調整を行うように
したものである。
[Means for Solving the Problems] An object lens driving device according to the present invention holds an objective lens, a lens holder having a center portion rotatably fixed to a support shaft, and an elastically movable lens holder. Support rubber to hold,
A fixed stand that supports the support shaft, a plurality of support rubber fixing portions that stand upright on the fixed stand to hold the support rubber, and a driving unit that rotates the lens holder and moves the lens holder up and down in the axial direction. In at least a part of the plurality of support rubber fixing portion, one end is rotatably supported by the fixing table, an eccentric shaft provided at the other end is an eccentric shaft mechanism fitted into the support rubber fixing portion, By rotating an eccentric shaft, the position of the objective lens is adjusted about the support shaft.

[作 用] 偏心軸機構を回転させることにより、支持ゴム固定部
が定量的な連続変位を起こし、これによってレンズホル
ダーが連続変位をするようになり、レンズホルダー内に
保持された対物レンズの中立位置をコリメート光の中心
に合わせることが容易となる。
[Operation] By rotating the eccentric shaft mechanism, the supporting rubber fixing portion causes a quantitative continuous displacement, thereby causing the lens holder to perform a continuous displacement, and the neutralization of the objective lens held in the lens holder. It is easy to adjust the position to the center of the collimated light.

[実施例] 第1図は本発明の一実施例の分解斜視図である。図に
おいて、(1)は対物レンズ、(2)はカウンターウエ
イト、(3)はレンズホルダ、(4)はレンズホルダ
(3)の中央部に接着されている可動軸受、(5)は可
動軸受(4)に嵌合する支軸である。またレンズホルダ
(3)には焦点制御用コイル(10)と、トラック制御用
コイル(11a),(11b)が取付けられている。焦点制御
用コイル(10)は固定台(14)側に設けられた焦点制御
用永久磁石(7)と焦点制御用ヨーク(9)によって形
成される磁気回路中に配置され、焦点制御用コイル(1
0)に所要の電流を通電することにより対物レンズ
(1)を含むレンズホルダ(3)を軸方向に移動させる
ことが出来る。又トラック制御用コイル(11a),(11
b)は対向して固定台(14)側に設けられたトラック制
御用永久磁石(8a),(8b)と、トラック制御用ヨーク
(12a),(12b)により形成される磁気回路中に配置さ
れており、トラック制御用コイル(11a),(11b)に所
要の電流を通電することにより軸回転方向(矢印B)に
レンズホルダ(3)を回動させることが出来る。さら
に、レンズホルダ(3)を弾性的に保持する支持ゴム
(6)は、固定台(14)及びトラック制御用ヨーク(12
a),(12b)とともに一体に形成されている3つの支持
ゴム固定部(13a),(13b),(13c)と、1つの偏心
ピン(17)により固定台(14)に取付けられている。こ
の偏心ピン(17)の一端には偏心軸(17a)が設けられ
て支持ゴム(6)に設けた穴(19)に回動可能に嵌合さ
れている。
Embodiment FIG. 1 is an exploded perspective view of one embodiment of the present invention. In the figure, (1) is an objective lens, (2) is a counterweight, (3) is a lens holder, (4) is a movable bearing adhered to the center of the lens holder (3), and (5) is a movable bearing. This is a support shaft fitted to (4). A focus control coil (10) and track control coils (11a) and (11b) are mounted on the lens holder (3). The focus control coil (10) is arranged in a magnetic circuit formed by a focus control permanent magnet (7) and a focus control yoke (9) provided on the side of the fixed base (14). 1
By passing a required current through 0), the lens holder (3) including the objective lens (1) can be moved in the axial direction. Also, truck control coils (11a), (11
b) is disposed in the magnetic circuit formed by the track control permanent magnets (8a) and (8b) provided opposite to the fixed base (14) and the track control yokes (12a) and (12b). By passing a required current through the track control coils (11a) and (11b), the lens holder (3) can be rotated in the shaft rotation direction (arrow B). Further, the supporting rubber (6) for elastically holding the lens holder (3) is provided with the fixing base (14) and the track control yoke (12).
a) and (12b) are attached to the fixing base (14) by three supporting rubber fixing parts (13a), (13b) and (13c) integrally formed with the (12b) and one eccentric pin (17). . An eccentric shaft (17a) is provided at one end of the eccentric pin (17), and is rotatably fitted in a hole (19) provided in the support rubber (6).

次にこの作用を説明する。 Next, this operation will be described.

偏心ピン(17)を矢印(C)方向へ回動することによ
り、支持ゴム(6)は、偏心ピン(17)の偏心軸(17
a)に導かれて、その偏心量に対応して水平に移動し、
これが支持ゴム(6)を介してレンズホルダ(3)に伝
達され、対物レンズ(1)を矢印(B)方向に変位させ
る。このように偏心ピン(17)を矢印(C)方向に回転
することにより、対物レンズ(1)の中立位置を光窓
(15)を通して発せられるコリメート光の中心に定量的
かつ連続的に調整することが可能となる。
By rotating the eccentric pin (17) in the direction of the arrow (C), the support rubber (6) moves the eccentric shaft (17) of the eccentric pin (17).
Guided to a), it moves horizontally according to the amount of eccentricity,
This is transmitted to the lens holder (3) via the support rubber (6), and displaces the objective lens (1) in the direction of the arrow (B). By rotating the eccentric pin (17) in the direction of the arrow (C) in this way, the neutral position of the objective lens (1) is quantitatively and continuously adjusted to the center of the collimated light emitted through the optical window (15). It becomes possible.

[発明の効果] 以上のように、本発明によれば、複数の支持ゴム固定
部の少なくとも一部を偏心軸機構とし、該偏心軸機構の
偏心軸を回転することによりレンズホルダの支軸を中心
に対物レンズの位置調整を行うようにしたので、トラッ
ク制御方向以外の相対位置を変化させることなく対物レ
ンズをコリメート光の中心に位置させる調整が容易にな
った。これによって、対物レンズの集光特性劣化、記録
再生信号の振幅低下、ジッタ・焦点制御用センサー感度
・トラック制御用センサ感度の非対称化を防止する効果
を上げることが出来た。
[Effects of the Invention] As described above, according to the present invention, at least a part of the plurality of support rubber fixing portions is used as an eccentric shaft mechanism, and the eccentric shaft of the eccentric shaft mechanism is rotated to set the support shaft of the lens holder. Since the position of the objective lens is adjusted at the center, it is easy to adjust the position of the objective lens at the center of the collimated light without changing the relative position other than the track control direction. As a result, the effect of preventing the deterioration of the light-collecting characteristics of the objective lens, the decrease in the amplitude of the recording / reproducing signal, and the asymmetry of the jitter, the sensitivity of the focus control sensor, and the sensitivity of the track control sensor could be improved.

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

第1図は本発明の一実施例の分解斜視図、第2図は従来
例の平面図、第3図は、第2図のX−Y断面図、第4図
第5図は従来例の作用を示す平面図である。 図において、(1)は対物レンズ、(3)はレンズホル
ダ、(5)は支軸、(6)は支持ゴム、(7)は焦点制
御用永久磁石(8a),(8b)はトラック制御用永久磁
石、(14)は固定台である。 なお各図中、同一符号は同一又は相当部分を示す。
FIG. 1 is an exploded perspective view of one embodiment of the present invention, FIG. 2 is a plan view of a conventional example, FIG. 3 is a cross-sectional view taken along the line XY of FIG. 2, and FIG. It is a top view which shows an effect | action. In the figure, (1) is an objective lens, (3) is a lens holder, (5) is a support shaft, (6) is a supporting rubber, (7) is a permanent magnet for focus control (8a), and (8b) is a track control. Permanent magnet, (14) is a fixed base. In the drawings, the same reference numerals indicate the same or corresponding parts.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−68644(JP,A) 特開 昭60−138746(JP,A) 特開 平1−312743(JP,A) 実開 昭63−168622(JP,U) 実開 昭63−105924(JP,U) 実開 昭64−815(JP,U) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-68644 (JP, A) JP-A-60-138746 (JP, A) JP-A-1-312743 (JP, A) Jpn. 168622 (JP, U) Fully open sho 63-105924 (JP, U) Really open sho 64-815 (JP, U)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】対物レンズを保持し、中心部が支軸に回動
自在に軸止されたレンズホルダと、該レンズホルダを弾
性的に保持する支持ゴムと、前記支軸を支持する固定台
と、該固定台に立設され前記支持ゴムを保持する複数の
支持ゴム固定部と、前記レンズホルダを回転かつ軸線方
向に上下動させる駆動手段とを備えた対物レンズ駆動装
置において、 前記複数の支持ゴム固定部の少なくとも一部を、一端が
前記固定台に回動可能に支持され、他端に設けた偏心軸
を前記支持ゴム固定部に嵌入した偏心軸機構とし、前記
偏心軸を回転することにより前記支軸を中心に前記対物
レンズの位置調整を行うことを特徴とする対物レンズ駆
動装置。
1. A lens holder for holding an objective lens and having a central portion rotatably fixed to a support shaft, a support rubber for elastically holding the lens holder, and a fixing base for supporting the support shaft. An objective lens driving device comprising: a plurality of support rubber fixing portions erected on the fixing base to hold the support rubber; and driving means for rotating the lens holder and vertically moving the lens holder in the axial direction. At least a part of the supporting rubber fixing portion is rotatably supported at one end by the fixing base, and an eccentric shaft provided at the other end is an eccentric shaft mechanism fitted into the supporting rubber fixing portion, and rotates the eccentric shaft. An objective lens driving device for adjusting the position of the objective lens around the support shaft.
JP63153623A 1988-06-23 1988-06-23 Objective lens drive Expired - Fee Related JP2709603B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63153623A JP2709603B2 (en) 1988-06-23 1988-06-23 Objective lens drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63153623A JP2709603B2 (en) 1988-06-23 1988-06-23 Objective lens drive

Publications (2)

Publication Number Publication Date
JPH01320651A JPH01320651A (en) 1989-12-26
JP2709603B2 true JP2709603B2 (en) 1998-02-04

Family

ID=15566541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63153623A Expired - Fee Related JP2709603B2 (en) 1988-06-23 1988-06-23 Objective lens drive

Country Status (1)

Country Link
JP (1) JP2709603B2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63168622U (en) * 1987-04-22 1988-11-02

Also Published As

Publication number Publication date
JPH01320651A (en) 1989-12-26

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