JP2001134975A - Objective lens for optical disk - Google Patents
Objective lens for optical diskInfo
- Publication number
- JP2001134975A JP2001134975A JP31278899A JP31278899A JP2001134975A JP 2001134975 A JP2001134975 A JP 2001134975A JP 31278899 A JP31278899 A JP 31278899A JP 31278899 A JP31278899 A JP 31278899A JP 2001134975 A JP2001134975 A JP 2001134975A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- tilt
- optical axis
- optical
- optical disk
- 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
- Microscoopes, Condenser (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Head (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、DVDディスク又
はCDディスク等の読み取り又は書き込み又はその両機
能対応の光ピックアップ装置等に使用される光ディスク
用対物レンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens for an optical disk used in an optical pickup device or the like which is capable of reading or writing a DVD disk or a CD disk or both functions.
【0002】[0002]
【従来の技術】DVDディスク又はCDディスク等の読
み取り又は書き込み又はその両機能対応等の光ピックア
ップ装置において、対物レンズ固定ホルダーへの対物レ
ンズコマ収差チルト調整貼付け方式、或いは光ピックア
ップ装置の光軸チルト調整方式として、対物レンズ透過
レーザ集光スポット光学測定チルト調整方式、もしくは
光ピックアップ装置の出力波形、ジッター値等の特性測
定観測調整方式が一般的である。2. Description of the Related Art In an optical pickup apparatus for reading or writing a DVD disk or a CD disk, or for supporting both functions, an objective lens coma aberration tilt adjustment bonding method to an objective lens fixing holder, or an optical axis tilt adjustment of the optical pickup apparatus. As a method, a tilt adjustment method for measuring an optical spot of a laser beam condensed by an objective lens or an observation adjustment method for measuring characteristics such as an output waveform of an optical pickup device and a jitter value is generally used.
【0003】上記方式は、サブミクロンフォーカシング
及び集光スポット一次光高精度画像処理技術、光ピック
アップ装置の特性観測高精度熟練調整技術等が要求され
るため、何れもチルト調整に時間を要し、且つ高額設備
となっている。The above-mentioned methods require submicron focusing, high-precision image processing technology for the primary light of a converging spot, and high-precision skill adjustment technology for observing the characteristics of an optical pickup device. And it is expensive equipment.
【0004】[0004]
【発明が解決しようとする課題】そこで対物レンズ固定
ホルダーへの対物レンズコマ収差チルト調整貼付け、或
いは光ピックアップ装置レーザ光光軸チルト調整が、オ
ートコリメータ等で安価に且つ短時間で実現できること
が望まれている。しかし従来の光ディスク用対物レンズ
では、それが果たし得なかった。Therefore, it is desired that the adjustment of the tilt of the coma aberration of the objective lens to the holder for fixing the objective lens or the tilt adjustment of the optical axis of the laser of the optical pickup device can be realized at a low cost and in a short time by an autocollimator or the like. ing. However, this cannot be achieved with the conventional optical disk objective lens.
【0005】図5は、従来例に係る対物レンズの形状を
示す図である。従来の対物レンズ1は、その光軸11に
対し高精度直角基準面となる部分がない、もしくは光軸
に対する高精度直角基準面としての精度保証がない、構
造又は品質となっていた。図中の符号12は光軸基準面
を示す。FIG. 5 is a view showing the shape of an objective lens according to a conventional example. The conventional objective lens 1 has a structure or quality in which there is no portion serving as a high-precision perpendicular reference plane with respect to the optical axis 11 or there is no guarantee of accuracy as a high-precision perpendicular reference plane with respect to the optical axis. Reference numeral 12 in the drawing denotes an optical axis reference plane.
【0006】本発明は、対物レンズ固定ホルダーへの対
物レンズコマ収差チルト調整貼付け、或いは、光ピック
アップ装置レーザ光光軸チルト調整が、オートコリメー
タ等で安価に且つ短時間でできる対物レンズを提供する
ことを目的とする。An object of the present invention is to provide an objective lens in which the adjustment of the tilt of the coma aberration of the objective lens to the holder for fixing the objective lens or the tilt adjustment of the optical axis of the laser of the optical pickup device can be performed at low cost and in a short time by an autocollimator or the like. With the goal.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するため
に、第1の手段は、DVDディスク又はCDディスクの
読み取り又は書き込み又はその両機能対応の光ピックア
ップ装置に使用される光ディスク用対物レンズにおい
て、上側非球面の外周部に、対物レンズの光軸に対し高
精度な直角保証基準面となる鏡面平坦面が形成されてい
ることを特徴とするものである。In order to achieve the above object, a first means is to provide an objective lens for an optical disk used in an optical pickup device compatible with reading or writing of a DVD disk or a CD disk or both functions. A flat mirror surface is formed on the outer peripheral portion of the upper aspherical surface, which is a reference surface for guaranteeing a right angle with high accuracy to the optical axis of the objective lens.
【0008】また第2の手段は、第1の手段において、
前記鏡面平坦面は、平行光照射時、その鏡面平坦面反射
光が容易に得られる幅で形成されていることを特徴とす
るものである。[0008] The second means is the first means,
The flat mirror surface is formed to have such a width that the reflected light of the flat mirror surface can be easily obtained when the parallel light is irradiated.
【0009】本発明において、上側非球面の外周部に、
対物レンズの光軸に対し高精度な直角保証基準面となる
鏡面平坦面が平行光照射時、その鏡面平坦面反射光が容
易に得られる幅で形成されていることにより、対物レン
ズ固定ホルダーへの対物レンズコマ収差チルト調整貼付
け、或いは、光ピックアップ装置レーザ光光軸チルト調
整が、オートコリメータ等で安価に且つ短時間ででき
る。In the present invention, on the outer peripheral portion of the upper aspherical surface,
The mirror flat surface, which is a reference plane that guarantees a high-precision right angle to the optical axis of the objective lens, is formed with a width that allows the reflected light of the flat mirror surface to be easily obtained when irradiating parallel light. The tilt adjustment of the objective lens coma aberration, or the tilt adjustment of the optical axis of the laser beam of the optical pickup device can be performed inexpensively and in a short time by an autocollimator or the like.
【0010】[0010]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図1は本発明の実施の形態に係る
光ディスク用対物レンズの形状を示す図である。本発明
では、対物レンズ1の上側非球面13の外周部に、その
対物レンズ1の光軸に対し高精度な直角保証基準面とな
る鏡面平坦面13aを設けたものである。この鏡面平坦
面13aは、平行光照射時、その鏡面平坦面反射光が容
易に得られる幅で形成される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a shape of an objective lens for an optical disk according to an embodiment of the present invention. In the present invention, a flat mirror surface 13a is provided on the outer peripheral portion of the upper aspherical surface 13 of the objective lens 1 as a reference surface for guaranteeing a right angle with respect to the optical axis of the objective lens 1 with high accuracy. The mirror flat surface 13a is formed to have such a width that the mirror flat surface reflected light can be easily obtained when the parallel light is irradiated.
【0011】これにより、対物レンズ固定ホルダーへの
対物レンズコマ収差チルト調整貼付け、或いは光ピック
アップ装置レーザ光光軸チルト調整が、オートコリメー
タ等で安価に且つ短時間で実現できる。[0011] Thus, the adjustment of the tilt of the coma aberration of the objective lens to the holder for fixing the objective lens or the adjustment of the tilt of the optical axis of the laser beam of the optical pickup device can be realized at low cost and in a short time by an autocollimator or the like.
【0012】次にこの対物レンズ1が組み込まれる対物
レンズ駆動装置の構成を説明する。図2ないし図4は基
本的な対物レンズ駆動装置の構成を示したもので、図2
は対物レンズ駆動装置の光ディスク接線方向の断面図、
図3はその対物レンズ駆動装置の側面図、図4はその対
物レンズ駆動装置の光ディスク半径方向の断面図であ
る。Next, the configuration of an objective lens driving device incorporating the objective lens 1 will be described. 2 to 4 show the configuration of a basic objective lens driving device.
Is a cross-sectional view of the objective lens driving device in the tangential direction of the optical disc,
FIG. 3 is a side view of the objective lens driving device, and FIG. 4 is a sectional view of the objective lens driving device in a radial direction of the optical disk.
【0013】対物レンズ1はレンズホルダー2上面に配
置され、レンズホルダー2の側面にフォーカシングコイ
ル3が巻回され、且つ、レンズホルダー2の側面に、ト
ラッキングコイル4及び対物レンズ1を光ディスク半径
方向に傾動駆動する傾動コイル9が貼付けられている。The objective lens 1 is disposed on an upper surface of a lens holder 2, a focusing coil 3 is wound around a side surface of the lens holder 2, and a tracking coil 4 and the objective lens 1 are mounted on a side surface of the lens holder 2 in a radial direction of the optical disc. A tilting coil 9 that is driven to tilt is attached.
【0014】4本の平行な直線状の弾性支持部材8は、
その一端をレンズホルダー2に、他端を固定部に固定さ
れ、対物レンズ1を支持しているレンズホルダー2は、
フォーカシング方向、トラッキング方向に移動可能で、
且つ、光ディスク半径方向への傾動動作も可能になるよ
うに弾性支持されている。The four parallel linear elastic support members 8 are:
The lens holder 2 having one end fixed to the lens holder 2 and the other end fixed to the fixing portion, and supporting the objective lens 1,
It can be moved in the focusing and tracking directions,
In addition, it is elastically supported so that it can be tilted in the radial direction of the optical disc.
【0015】弾性支持部材8の一端が固定されている固
定部に、ヨーク5とマグネット6から構成される磁気回
路が配置され、前記フォーカシングコイル3、トラッキ
ングコイル4、及び傾動コイル9を流れる駆動電流は、
この磁気回路から発生される磁束に作用するように配置
されている。対物レンズ1を支持しているレンズホルダ
ー2の上面に、光ディスクの傾きを検出する傾き検出器
7が配置されている。フォーカシング制御時は、光ディ
クス記録面の面振れに対応して、フォーカシングコイル
3に電流を適切に供給して対物レンズ1を光軸方向に動
作させ、光ビームのスポットを光ディスク記録面上に追
従させることができる。A magnetic circuit composed of a yoke 5 and a magnet 6 is disposed on a fixed portion to which one end of the elastic support member 8 is fixed, and a driving current flowing through the focusing coil 3, the tracking coil 4, and the tilt coil 9 is provided. Is
It is arranged to act on the magnetic flux generated from this magnetic circuit. An inclination detector 7 for detecting the inclination of the optical disk is arranged on the upper surface of the lens holder 2 supporting the objective lens 1. At the time of the focusing control, the current is appropriately supplied to the focusing coil 3 to operate the objective lens 1 in the optical axis direction in accordance with the deflection of the optical disk recording surface, and the spot of the light beam follows the optical disk recording surface. Can be done.
【0016】トラッキング制御時は、光ディスクのトラ
ックの偏芯、蛇行に対応して、トラッキングコイル4に
適切に電流を供給して対物レンズ1を光軸と直角方向に
動作させ、光ビームのスポットを光ディスクのトラック
上に追従させることができる。At the time of tracking control, an appropriate current is supplied to the tracking coil 4 in accordance with the eccentricity and meandering of the track of the optical disk, and the objective lens 1 is operated in a direction perpendicular to the optical axis to make the spot of the light beam. It can follow the track of the optical disc.
【0017】光ディスクの傾きに対しては、傾き検出器
7からの信号を基に傾動コイル9に適切に電流を供給
し、対物レンズ1を光ディスクの傾きに対応して傾動駆
動させる。With respect to the tilt of the optical disk, an appropriate current is supplied to the tilt coil 9 based on the signal from the tilt detector 7 to drive the objective lens 1 to tilt corresponding to the tilt of the optical disk.
【0018】[0018]
【発明の効果】本発明によれば、上側非球面の外周部
に、対物レンズの光軸に対し高精度な直角保証基準面と
なる鏡面平坦面が平行光照射時、その鏡面平坦面反射光
が容易に得られる幅で形成されていることにより、対物
レンズ固定ホルダーへの対物レンズコマ収差チルト調整
貼付け、或いは光ピックアップ装置レーザ光光軸チルト
調整を、オートコリメータ等で安価に且つ短時間に実現
することができる。According to the present invention, when a mirror flat surface serving as a reference plane for guaranteeing a right angle with high precision to the optical axis of the objective lens is irradiated on the outer peripheral portion of the upper aspheric surface in parallel light, the mirror flat surface reflected light Is formed in a width that can be easily obtained, so that it is possible to attach the objective lens coma tilt adjustment to the objective lens fixing holder or adjust the tilt of the optical axis of the optical pickup device at low cost and in a short time using an autocollimator. can do.
【図1】本発明の実施の形態に係る光ディスク用対物レ
ンズの形状を示す図である。FIG. 1 is a diagram showing a shape of an objective lens for an optical disc according to an embodiment of the present invention.
【図2】対物レンズ駆動装置の光ディスク接線方向の断
面図である。FIG. 2 is a sectional view of an objective lens driving device in a tangential direction of an optical disk.
【図3】その対物レンズ駆動装置の側面図である。FIG. 3 is a side view of the objective lens driving device.
【図4】その対物レンズ駆動装置の光ディスク半径方向
の断面図である。FIG. 4 is a sectional view of the objective lens driving device in a radial direction of the optical disk.
【図5】従来例に係る対物レンズの形状を示す図であ
る。FIG. 5 is a diagram showing a shape of an objective lens according to a conventional example.
1 対物レンズ 2 レンズホルダー 3 フォーカシングコイル 4 トラッキングコイル 5 ヨーク 6 マグネット 7 傾き検出器 8 弾性支持部材 9 傾動コイル 11 光軸 12 光軸基準面 13 上側非球面 13a 鏡面平坦面 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 3 Focusing coil 4 Tracking coil 5 Yoke 6 Magnet 7 Tilt detector 8 Elastic support member 9 Tilt coil 11 Optical axis 12 Optical axis reference plane 13 Upper aspherical surface 13a Mirror flat surface
Claims (2)
スク用対物レンズにおいて、上側非球面の外周部に、対
物レンズの光軸に対し高精度な直角保証基準面となる鏡
面平坦面が形成されていることを特徴とする光ディスク
用対物レンズ。In an objective lens for an optical disk used in an optical pickup device, a flat mirror surface is formed on an outer peripheral portion of an upper aspheric surface as a reference surface for guaranteeing a right angle with high accuracy to an optical axis of the objective lens. An objective lens for an optical disk, characterized in that:
において、前記鏡面平坦面は、平行光照射時、その鏡面
平坦面反射光が容易に得られる幅で形成されていること
を特徴とする光ディスク用対物レンズ。2. An optical disk objective lens according to claim 1, wherein said flat mirror surface is formed to have such a width that said mirror flat surface reflected light can be easily obtained upon irradiation of parallel light. Objective lens.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31278899A JP2001134975A (en) | 1999-11-02 | 1999-11-02 | Objective lens for optical disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31278899A JP2001134975A (en) | 1999-11-02 | 1999-11-02 | Objective lens for optical disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001134975A true JP2001134975A (en) | 2001-05-18 |
Family
ID=18033424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31278899A Pending JP2001134975A (en) | 1999-11-02 | 1999-11-02 | Objective lens for optical disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2001134975A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011165288A (en) * | 2010-02-12 | 2011-08-25 | Konica Minolta Opto Inc | Objective lens of optical pickup and optical pickup |
-
1999
- 1999-11-02 JP JP31278899A patent/JP2001134975A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011165288A (en) * | 2010-02-12 | 2011-08-25 | Konica Minolta Opto Inc | Objective lens of optical pickup and optical pickup |
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