JPH0242634A - Objective lens driving device - Google Patents
Objective lens driving deviceInfo
- Publication number
- JPH0242634A JPH0242634A JP19266588A JP19266588A JPH0242634A JP H0242634 A JPH0242634 A JP H0242634A JP 19266588 A JP19266588 A JP 19266588A JP 19266588 A JP19266588 A JP 19266588A JP H0242634 A JPH0242634 A JP H0242634A
- Authority
- JP
- Japan
- Prior art keywords
- lens holder
- objective lens
- supporting shaft
- gap
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 230000036316 preload Effects 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 230000004043 responsiveness Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 3
- 241000252233 Cyprinus carpio Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、対物レンズ駆動装量に関し、例えば光学式
ディスクの情報記録面に集光される光スポットのトラッ
クずれ及び焦点ずれを制御するようＫした再生装曾、記
録装置又は記録再生装置などに特に好ましく用いること
のできる対物レンズ駆動装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an objective lens drive unit, and is used to control the track deviation and defocus of a light spot focused on the information recording surface of an optical disk, for example. The present invention relates to an objective lens driving device that can be particularly preferably used in a high-speed reproduction device, a recording device, a recording and reproducing device, and the like.
従来の対物レンズ駆動装置としては、例えば軸摺動回動
方式と称される第６図ないし第８図忙示すものがあった
。As a conventional objective lens driving device, there is, for example, one called a shaft sliding rotation type as shown in FIGS. 6 to 8.
同図において、（１）は対物レンズ、（２）はカウンタ
ーウェイト、（３）はこれら対物レンズ（１）及びカウ
ンターウェイト（２）を保持すると共Ｋ、可動軸受（３
ａ）及び焦点制御用コイルボビン（３ｂ）を有するレン
ズホルダである。（４）は支軸であり、上記可動軸受（
３ａ）を介して上記レンズホルダ（３）を回動自在かつ
軸線方向に摺動自在に支承している。（５）はレンズホ
ルダ（３）を保持するダンパー、（６）は焦点制御用永
久磁石、（７ａ）（７ｂ）はトラック制御用永久磁石、
（８）は支１Ｍ！ （４）と焦点制御用永久磁石（６）
の保持合せを兼ねたヨーク、（９ａ）（９ｂ）はトラッ
ク制御用ヨーク、（ｌＯ）は焦点制御用コイル、（１１
ａ）（ｌｌｂ）はトラック制御用コイｙ、 （１２ａ）
（１２ｂ）はダンパー （５１を固定するダンパー固定
ピン、（１３）はこのダンパー固定ピン（１２ａ）（１
２ｂ）を立設して支持する固定台、（１４）は防塵カバ
ーである。In the figure, (1) is an objective lens, (2) is a counterweight, (3) is a movable bearing (3) that holds the objective lens (1) and the counterweight (2), and a movable bearing (3).
a) and a focus control coil bobbin (3b). (4) is a support shaft, and the movable bearing (
3a), the lens holder (3) is supported rotatably and slidably in the axial direction. (5) is a damper that holds the lens holder (3), (6) is a permanent magnet for focus control, (7a) and (7b) are permanent magnets for track control,
(8) is 1M! (4) and permanent magnet for focus control (6)
(9a) and (9b) are track control yokes, (lO) is a focus control coil, (11
a) (llb) is a truck control carp y, (12a)
(12b) is a damper fixing pin that fixes the damper (51), (13) is this damper fixing pin (12a) (1
2b) is a fixed stand that stands up and supports it, and (14) is a dustproof cover.
上記、構成の対物レンズ駆動装置では、支軸（４）に筒
状の可動軸受（３ａ）を介してレンズホルダ（３）を支
承しているので、レンズホルダ（３）は、支軸（４）の
長手方向、すなわち、第８図の矢印Ｂの方向に摺動自在
に支持されるとともＫ、第７図の矢印Ａの方向Ｋ、支軸
（４）を中心に回動自在に支持される。In the objective lens drive device configured as described above, the lens holder (3) is supported on the support shaft (4) via the cylindrical movable bearing (3a). ), that is, in the direction of arrow B in FIG. 8, and rotatably supported in the direction K of arrow A in FIG. be done.
ここで、焦点制御用コイル（１０）Ｋ所望の電流を流す
ことＫよりレンズホルダ（３）を矢印Ｂの方向に移動さ
せて記録媒体（図示省略）Ｋ対して焦点制御を行なうこ
とができ、また、支軸（４）より所定距離離れた位置に
対物レンズ（１）をレンズホルダ（３）に対して固定し
ているので、トラック制御用コイル（１１ａ）（１１ｂ
）に所望の電流を流して、矢印Ｂの方向に対物レンズ（
１）を回動させてトラック制御を行なうことができる。Here, by applying a desired current to the focus control coil (10) K, the lens holder (3) can be moved in the direction of arrow B to perform focus control on the recording medium (not shown) K. In addition, since the objective lens (1) is fixed to the lens holder (3) at a predetermined distance away from the support shaft (4), the track control coils (11a) (11b
) through the objective lens ( ) in the direction of arrow B.
Track control can be performed by rotating 1).
〔発明が解決しようとする諌題〕
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
り可動軸受（３ａ）と支軸（４）には例えば約１０μｍ
のギャップがある。したがって、可動軸受（３ａ）の長
さを仮Ｋ ５ ｔｍ程度とすると、対物レンズ（１１は
第９図（イ）、（つ）に示すように最大で±２ Ｒｒａ
ｄ程度傾くことが考えられる。この対物レンズ（１）の
傾きは、光スポットの信頼性を悪化させる原因の１つで
あり、今後、光デイスク装置などの記録密度を向上させ
てゆくためには改善しなければならない問題である。ま
た、上記のギャップは、ｊｌｊ！擦と同様に、対物レン
ズ駆動装置の非線形要素であり、対物レンズ駆動装蓋の
応答性を悪化させる要因の１つでもある。[Problem to be solved by the invention] The conventional objective lens driving device is constructed as described above, and the movable bearing (3a) and the support shaft (4) have a diameter of about 10 μm, for example.
There is a gap. Therefore, assuming that the length of the movable bearing (3a) is approximately K 5 tm, the objective lens (11 has a maximum length of ±2 Rra as shown in FIGS.
It is conceivable that it tilts by about d. This tilt of the objective lens (1) is one of the causes of deteriorating the reliability of the optical spot, and is a problem that must be improved in order to improve the recording density of optical disk devices in the future. . Also, the above gap is jlj! Like friction, it is a nonlinear element of the objective lens drive device, and is also one of the factors that worsens the responsiveness of the objective lens drive unit.
しかしながら、上記のギャップは、可動軸受（３ａ）及
び支軸（４）の機械精度から決定された値であり、加工
上必要不可欠なものである。したがって、上記ギャップ
による問題を解消するためにギャップを小さくするとい
うことは非常に困難である。However, the above gap is a value determined from the mechanical accuracy of the movable bearing (3a) and the support shaft (4), and is essential for processing. Therefore, it is very difficult to reduce the gap in order to solve the problem caused by the gap.
この発明は、上述のような問題点を解消するためになさ
れたものであり、ギャップの影響が少なく応答性が良く
、かつ記録密度の向上が図れる対物レンズ動動装會を得
ることを目的としている。This invention was made to solve the above-mentioned problems, and aims to provide an objective lens moving assembly that is less affected by gaps, has good responsiveness, and can improve recording density. There is.
この発明に係る対物レンズ駆動装置は、Ｖンズホルダを
支軸に対し所的方向に押圧するように付勢する磁石装置
を備えたものである。The objective lens drive device according to the present invention includes a magnet device that biases the V-lens holder so as to press it in a predetermined direction with respect to the support shaft.
この発明における磁石装置は、支軸に対しレンズホルダ
を所定方向に押圧することＫより、支軸とレンズホルダ
とのギャップを実質的に零にしたと同様に動作する。By pressing the lens holder against the support shaft in a predetermined direction, the magnet device according to the present invention operates in the same manner as if the gap between the support shaft and the lens holder was made substantially zero.
以下、この発明の一実施例について１図面を用いて説明
する。第１図はこの発明の一実施例を説明するための部
分断面図である。同図において、（１５）は永久磁石で
あって、レンズホルダ（３）、従って可動軸受（３ａ）
と支軸（４）との間に磁気吸引力によるプリロードが加
わるようにレンズホルダ（３）Ｋ樹脂モールドされた形
で設置されているにこで、支軸（４）の材料としては鉄
等の磁性体を使用するものとする。また、この場合、永
久磁石（１５）と支軸（４）によって磁石装置（１６）
を構成している。An embodiment of the present invention will be described below with reference to one drawing. FIG. 1 is a partial sectional view for explaining one embodiment of the present invention. In the same figure, (15) is a permanent magnet, which is attached to the lens holder (3) and therefore the movable bearing (3a).
The lens holder (3) is molded with K resin so that a preload due to magnetic attraction is applied between the support shaft (4) and the lens holder (4).The material of the support shaft (4) is iron, etc. The magnetic material shall be used. In addition, in this case, the permanent magnet (15) and the spindle (4) create a magnet device (16).
It consists of
なお、従来例と同一符号を付したものは従来例と同一ま
たは相当する部材を示しているので説明を省略する。Note that the same reference numerals as those in the conventional example indicate members that are the same or correspond to those in the conventional example, and therefore the description thereof will be omitted.
上記実施例は以上のように構成されており、したがって
第２図に示すように動作する。すなわち。The above embodiment is constructed as described above, and therefore operates as shown in FIG. Namely.
ｗ！、２図（７）Ｋ示すように可動軸受（３ａ）と支軸
（４）に磁気吸引力が作用しているため、両者は常にあ
る線上で接触しており、従来例のようにガタつくことが
なく、レンズホルダ（３）が第２図（イ）の如く、図の
下方、向に動作するときも、第２図（つ）の如く５図の
上方向に動作するときも対物レンズ（１）は第９図に示
す従来装置のように傾動することはない。したがって、
信頼性の高い光スポットを得ることができ、記録密度の
向上が図れる。また、ガタつくことがないので応答性の
良好な対物レンズ駆動装置を得ることができる。Lol! , As shown in Figure 2 (7) K, because magnetic attraction is acting on the movable bearing (3a) and the support shaft (4), they are always in contact on a certain line, and there is no wobbling as in the conventional example. When the lens holder (3) moves downward in the figure as shown in Fig. 2 (A), and when it moves upward in Fig. 5 as shown in Fig. 2 (T), the objective lens (1) does not tilt like the conventional device shown in FIG. therefore,
A highly reliable light spot can be obtained, and recording density can be improved. Further, since there is no wobbling, an objective lens driving device with good responsiveness can be obtained.
第３図は、本発明に係る第２の実施例を示すものである
。本実施例では、レンズホルダ（３）の上下面にプリロ
ード用永久磁石（１５ａ）（１５Ｎを投首する構成とし
た。この構成にあっても第１の実施例と同様の効果を奏
することは言うまでもない。FIG. 3 shows a second embodiment of the present invention. In this embodiment, a preloading permanent magnet (15a) (15N) is attached to the upper and lower surfaces of the lens holder (3).This structure also provides the same effect as the first embodiment. Needless to say.
第４因及び第５図は、本発明に係る第３の実施例を示す
ものであり、第４図は部分断面図、第５図はその要部詳
細図を示している。同図において、（１５）はプリロ゛
−ド用永久磁石、（１６ａＭ１６ｂ）は可動軸受である
。本実施例にあっては、第５図の如く、可動軸受（１６
ａ）（１６ｂ）をレンズホルダ（３）の上端面と下端面
にそれぞれ配設しているため、第１及び第２の実施例と
比較して、可動軸受（１６ａ）（１６ｂ）と支軸（４）
の接触面積が非常に小さくでさる。The fourth factor and FIG. 5 show a third embodiment according to the present invention, with FIG. 4 showing a partial sectional view and FIG. 5 showing a detailed view of the main part thereof. In the figure, (15) is a preload permanent magnet, and (16aM16b) is a movable bearing. In this embodiment, as shown in FIG.
a) (16b) are arranged on the upper and lower end surfaces of the lens holder (3), so compared to the first and second embodiments, the movable bearings (16a) and (16b) and the supporting shaft are (4)
The contact area is very small.
したがって、可動軸受（１６ａ）（１６ｂ）と支軸（４
）との摩擦力を小さくすることができ、上記第１及び第
２の実施例と同様の効果を奏するとともに、さらに応答
性の良好な対物レンズ駆動装置を得ることができる。な
お、本実施例に使用する可動軸受（１６ａ）（１６ｂ’
）にあっては、エツジ部のひっかかり等による動作影響
をなくすため、可動軸受（１６ａ）（１６ｂ）の上下両
面からテーパを設けたほうが好ましい。Therefore, the movable bearings (16a) (16b) and the support shaft (4
), it is possible to obtain an objective lens driving device that achieves the same effects as the first and second embodiments and has even better responsiveness. Note that the movable bearings (16a) (16b') used in this example
), it is preferable to provide tapers from both the upper and lower surfaces of the movable bearings (16a) and (16b) in order to eliminate operational effects caused by catching on the edges.
なお、上記各実施例では永久磁石（１５）をレンズホル
ダ（３）に設け、支軸（４）として磁性材を用い、これ
ら永久磁石（１５）と支軸（４）によって磁石装置（１
６）を構成したが、これらに限定されるものではなく、
要するに、支軸（４）に対し、レンズホルダ（３）が所
定方向に抑圧（吸引を含む）される構成であればよい。In each of the above embodiments, a permanent magnet (15) is provided in the lens holder (3), a magnetic material is used as the spindle (4), and the magnet device (1
6), but is not limited to these.
In short, any configuration is sufficient as long as the lens holder (3) is suppressed (including suction) in a predetermined direction with respect to the support shaft (4).
この意味で永久磁石（１５）を支軸（４）Ｋ固定して設
け、これに吸引される磁性材をレンズホルダ（３） Ｋ
ｆ＆けてもよい。In this sense, the permanent magnet (15) is fixed to the spindle (4) K, and the magnetic material attracted to this is attached to the lens holder (3) K.
You can also use f&.
さらに、支軸とレンズホルダの双方に永久磁石を設け、
異極同士の吸引力、あるいは同極相互の反撥力を利用す
るものであっても差し支えるものではない。Furthermore, permanent magnets are installed on both the spindle and the lens holder.
There is no problem in using the attraction force between different polarities or the repulsive force between like polarities.
また、支軸（４）に対するレンズホルダ（３）の付勢方
向も上記実施例のもの忙限定されるものではない。Further, the biasing direction of the lens holder (3) with respect to the support shaft (4) is not limited to that of the above embodiment.
その他、この発明の精神の範囲内で樵々の変更や変形が
可能であることはいうまでもない。It goes without saying that other changes and modifications can be made to the woodcutter within the scope of the spirit of the invention.
以上のようＫ、この発明によれば、レンズホルダと支軸
に磁力によるプリロードが作用するように構成したので
、可動軸受と支軸のギャップによる動作中のガタつき及
び対物レンズの傾きが解消でき、応答性が良り、シかも
、記録密度向上が可能な対物レンズ駆動装置が得られる
効果がある。As described above, according to the present invention, since the lens holder and the support shaft are configured to be preloaded by magnetic force, it is possible to eliminate wobbling during operation and tilting of the objective lens due to the gap between the movable bearing and the support shaft. This has the effect of providing an objective lens driving device that has good responsiveness and can also improve recording density.
【図面の簡単な説明】
第１図はこの発明の第１の実施例を示す部分断面図、第
２図は同じく、その動作状況を説明するための図である
。第３図はこの発明の第２の実施例を示す部分断面図、
第４図及び第５図は同じく第３の実施例を説明するため
の図であって、第４図は部分断面図、第５図は要部詳細
図である。
第６図乃至第９図は、従来の対物レンズ駆動装置の一例
を説明するための図であり、第６図は分解斜視図、第７
図は部分平面図、第８図は部分断面図、第９図はその動
作状況を説明するための図である。
図において、（１）は対物レンズ、（３）はレンズホル
ダ、（４）は支軸、（１６）は磁石装置である。
なお、各図中、則−符号は同−又は相当部分を示す。
代理人 曾 我 道 照 ｊにｊ；・・“
づ１：友閂勿レンズ。
３：レンズボルタ“
４：支卑白
１６：石ルし茨菫
最３図
怖４図
事件の表示
特願昭
６３−１９２６６５号
発明の名称
対物レンズ駆動装置
補正をする者
事件との関係 特許出願人
住 所 東京都千代田区丸の内二丁目２番３号
名 称 （６０１）三菱電機株式会社代表者 志岐守
哉BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view showing a first embodiment of the present invention, and FIG. 2 is a diagram for explaining the operating situation thereof. FIG. 3 is a partial sectional view showing a second embodiment of the invention;
4 and 5 are diagrams for explaining the third embodiment, in which FIG. 4 is a partial sectional view and FIG. 5 is a detailed view of the main part. 6 to 9 are diagrams for explaining an example of a conventional objective lens driving device, in which FIG. 6 is an exploded perspective view, and FIG. 7 is an exploded perspective view.
The figure is a partial plan view, FIG. 8 is a partial sectional view, and FIG. 9 is a diagram for explaining the operating situation. In the figure, (1) is an objective lens, (3) is a lens holder, (4) is a support shaft, and (16) is a magnet device. In addition, in each figure, the rule numerals indicate the same or equivalent parts. Agent Zeng Ga Do Teru jnij;・・“
1: Yukino Nazo lens. 3: Lens voltage 4: Support white 16: Ishirushi Ibara violet 3rd figure, 4th figure, display of the incident Patent application No. 192665/1983 Name of the invention Relationship to the person who corrects the objective lens drive device Patent application Address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki
Claims (1)
を上記対物レンズの光軸方向に移動自在に支承すると共
に光軸に直交する面内に回動自在に支承する支軸、上記
レンズホルダを上記支軸に対し所定方向に押圧するよう
に付勢する磁石装置を備えたことを特徴とする対物レン
ズ駆動装置。A lens holder that holds an objective lens; a support shaft that supports the lens holder so as to be movable in the direction of the optical axis of the objective lens and rotatable in a plane perpendicular to the optical axis; 1. An objective lens driving device comprising a magnet device that urges an object to be pressed in a predetermined direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63192665A JP2656081B2 (en) | 1988-08-03 | 1988-08-03 | Objective lens drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63192665A JP2656081B2 (en) | 1988-08-03 | 1988-08-03 | Objective lens drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0242634A true JPH0242634A (en) | 1990-02-13 |
| JP2656081B2 JP2656081B2 (en) | 1997-09-24 |
Family
ID=16295009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63192665A Expired - Fee Related JP2656081B2 (en) | 1988-08-03 | 1988-08-03 | Objective lens drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2656081B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6823707B2 (en) | 2002-04-04 | 2004-11-30 | Abl Fabricators, Inc. | Mobile flange press and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63106938A (en) * | 1986-10-23 | 1988-05-12 | Sharp Corp | Objective lens holding device |
| JPS63182805A (en) * | 1987-01-24 | 1988-07-28 | Crown Kk | Magnetic driving method for actuator such as optical pick-up and its device |
-
1988
- 1988-08-03 JP JP63192665A patent/JP2656081B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63106938A (en) * | 1986-10-23 | 1988-05-12 | Sharp Corp | Objective lens holding device |
| JPS63182805A (en) * | 1987-01-24 | 1988-07-28 | Crown Kk | Magnetic driving method for actuator such as optical pick-up and its device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6823707B2 (en) | 2002-04-04 | 2004-11-30 | Abl Fabricators, Inc. | Mobile flange press and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2656081B2 (en) | 1997-09-24 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |