JPS63298821A - Optical head - Google Patents
Optical headInfo
- Publication number
- JPS63298821A JPS63298821A JP13409687A JP13409687A JPS63298821A JP S63298821 A JPS63298821 A JP S63298821A JP 13409687 A JP13409687 A JP 13409687A JP 13409687 A JP13409687 A JP 13409687A JP S63298821 A JPS63298821 A JP S63298821A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- access
- track
- fitting
- high speed
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 25
- 238000013016 damping Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、光ディスク等の情報記憶媒体にレーザ光等の
光を集光させて光学的に情報の読取り等の処理を施す装
置に設けられる光学ヘッドに関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention focuses light such as a laser beam on an information storage medium such as an optical disk to optically perform processing such as reading information. The present invention relates to an optical head installed in an apparatus for applying the present invention.
（従来の技術）
従来、光ディスク等の情報記憶媒体にレーザ光等の光を
用いて、情報の書込み、再生、再よ込み等の処理を行な
う装置においては、正確に情報記憶媒体に対して上記の
処理を行なうために、情報記憶媒体の右する“そり″や
°撮れ′に対して光学ヘッドを忠実に追従さＩ！る必要
があった。(Prior Art) Conventionally, in a device that uses light such as a laser beam to write, reproduce, or reread information on an information storage medium such as an optical disk, the above-mentioned In order to perform this processing, the optical head faithfully follows the "warpage" or "shooting" of the information storage medium. It was necessary to
そのために上記光学ヘッドの対物レンズと情報記憶媒体
のトラック面との距離を制御するフォーカス制御と、こ
のトラックの偏心に対して対物レンズを追従１１１１
ｌｌｌする１〜ラツキング制御を行なっていた。For this purpose, focus control is performed to control the distance between the objective lens of the optical head and the track surface of the information storage medium, and the objective lens is made to follow the eccentricity of this track (1111).
1 to 1 racking control was performed.
また、このトラッキング制御は光学ヘッドを情報記憶媒
体の所定の位置に移動する粗アクセスの後に、この光学
ヘッドの対物レンズの光軸を情報記憶媒体の所定のトラ
ック位置に微細に駆動する微細アクセスを行なうことに
よって迅速かつ正確なトラッキングを可能としていた。This tracking control also involves coarse access in which the optical head is moved to a predetermined position on the information storage medium, followed by fine access in which the optical axis of the objective lens of the optical head is finely moved to a predetermined track position on the information storage medium. This enabled quick and accurate tracking.
しかしながら粗アクセスのように移動最の大きなアクセ
スを高速で行なうと、対物レンズおよびその保持体が振
動して粗アクセスに連続して微細アクセスを行なうこと
が困難となった。However, when the largest access such as coarse access is performed at high speed, the objective lens and its holder vibrate, making it difficult to perform fine access following coarse access.
そこで、第３図に示す様に、対物レンズ１１１、この対
物レンズ１１１を保持する対物レンズ保持枠１１３、対
物レンズ１１１をフォーカス方向に駆動りる駆動コイル
（以下、フォーカスコイルという）１０７、同じくトラ
ッキング方向に駆動する駆動コイル（以下、トラックコ
イルという）１０９．１０９を一体に形成して可動部を
構成し、また基台１０１上には対向する向きに１対のヨ
ーク１０３Ａ、１０３Ｂとマグネット１０５Ａ、１０５
Ｂを立設し、さらに平行して配置されたワイヤ１１６を
用いて上記可動部を支持することによって対物レンズ１
１１をフォーカス方向及びトラック方向の２方向へ駆動
できるようにすると共に、このワイＡ７１１６の周Ｉ１
０には撮動減衰用ゴムを嵌装して、粗アクセスによって
発生した振動をこの振動減衰用ゴムにＪ：って減衰させ
るようにしていた。Therefore, as shown in FIG. 3, an objective lens 111, an objective lens holding frame 113 that holds this objective lens 111, a drive coil (hereinafter referred to as a focus coil) 107 that drives the objective lens 111 in the focusing direction, and a tracking Drive coils (hereinafter referred to as track coils) 109 and 109 that drive in the direction are integrally formed to constitute a movable part, and on the base 101 are a pair of yokes 103A and 103B and a magnet 105A in opposing directions. 105
The objective lens 1
11 in two directions, the focus direction and the track direction, and the circumference I1 of this wire A7116.
0 was fitted with a photographing damping rubber so that vibrations generated by rough access were attenuated by the vibration damping rubber.
（発明が解決しようとする問題点）
しかしながら、ボＩ記可動部はリニアモータ等を用いて
高速で駆動されるため、この駆動侵停止した際に発生す
る振動をこの振動減衰用ゴムだけで急速に減衰させるこ
とは非常に困難であった。(Problem to be Solved by the Invention) However, since the movable part described in (I) is driven at high speed using a linear motor or the like, the vibrations generated when the drive stops moving can be rapidly damped by the vibration damping rubber alone. It was very difficult to attenuate it.
本発明は上記した従来の問題点に鑑み光学ヘッドのｎ速
アクセスの実現化のために粗アクセスの際の可動部の揺
動を防止した光学ヘッドを提供することを目的とする。In view of the above-mentioned conventional problems, an object of the present invention is to provide an optical head that prevents the movable part from swinging during rough access in order to realize n-speed access of the optical head.
［発明の構成１
（問題点を解決するための手段）
上記目的を達成するため、本発明は光学ヘッドに、情報
記憶媒体上に光を集光させる対物レンズを保持する保持
手段と、この保持手段を離脱自在に固定する固定手段と
を有して構成した。[Structure 1 of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides an optical head with a holding means for holding an objective lens that focuses light on an information storage medium, and a holding means for holding the objective lens for condensing light onto an information storage medium. and a fixing means for detachably fixing the means.
（作用）
本発明における光学ヘッドにおいては、例えば情報の読
取りの際く情報記憶媒体上に光を集光させる対物レンズ
を情報記憶媒体の所定の位置に移動したときに、この対
物レンズを保持する保持体が振動するのを防止するため
に、この保持体を固定手段を用いてＩＩｔｌ脱自在に固
定するようにしたので、当該光学ヘッドの移動を短時間
で行い得るものである。(Function) In the optical head of the present invention, for example, when an objective lens that focuses light on an information storage medium for reading information is moved to a predetermined position on the information storage medium, this objective lens is held. In order to prevent the holder from vibrating, the holder is removably fixed using a fixing means, so that the optical head can be moved in a short time.
（実施例） 以下、図面を用いて本発明の一実施例を詳述する。(Example) Hereinafter, one embodiment of the present invention will be described in detail using the drawings.
まず、光デイスク装置に使用される本ｖ装置の概要につ
いて説明する。情報の書込み、または再生を行なうため
、レーザービームを光ディスクなどの情報記憶媒体面に
結像させることにより、情報記憶媒体上に刻設されたス
パイラル状若しくは同心円状の溝（トラック）によって
結像点を所定の位置まで案内する。First, an overview of this V device used in an optical disk device will be explained. In order to write or read information, a laser beam is focused on the surface of an information storage medium such as an optical disk, and a spiral or concentric groove (track) carved on the information storage medium forms an image point. to the designated position.
そこで、占込みはレーザー光の熱によって情報記憶媒体
面上の薄膜（記録膜）を溶かし、ビットを形成すること
によって行なわれ、読出しは情報記憶媒体上にレーザー
光を照射してその反射光を検知し、ビットの有無を検出
することによって行なわれる。Therefore, writing is performed by melting the thin film (recording film) on the surface of the information storage medium using the heat of laser light, and forming bits, and reading is performed by irradiating the information storage medium with laser light and using the reflected light. This is done by sensing and detecting the presence or absence of bits.
上記レーｔ１−光を所定の位置まで案内するには光学系
で焦点ぼけおよびトラックの位置ずれを検知し、サーボ
回路を介してアクチュエータを駆動し、フォーカス方向
のぼけやトラックの位置ずれがなくなるように制御する
必要がある。この制御を実現するため、対物レンズの駆
動５Ａ置は対物レンズをフォーカス方向およびトラック
に対して垂直方向く以下トラック方向と称す）の２方向
へ駆動できるようになっている。Rate t1 - To guide the light to a predetermined position, the optical system detects defocus and track positional deviation, and the actuator is driven via the servo circuit to eliminate blurring in the focus direction and track positional deviation. need to be controlled. In order to realize this control, the objective lens drive unit 5A is configured to drive the objective lens in two directions: the focus direction and the direction perpendicular to the track (hereinafter referred to as the track direction).
次にこの対物レンズの駆動装置について詳細に説明する
。Next, this objective lens driving device will be explained in detail.
第１図において、基台１上には磁性体（例えばＦＱ）よ
りなるヨーク３Ａ、３Ｂおよび３Ｃを立設し一体的に形
成されており、上記ヨーク３Δおよび３Ｂの内壁面は、
それぞれ一対のマグネット５Ａ、５Ｂが対向して取付Ｇ
ノである。一方、ヨーク３Ｃの外周には、離間してフォ
ーカスコイル７およびトラック方向駆動コイル（以下、
トラックコイルという）９が巻装されて磁気回路を構成
している。In FIG. 1, yokes 3A, 3B, and 3C made of magnetic material (for example, FQ) are erected and integrally formed on a base 1, and the inner wall surfaces of the yokes 3Δ and 3B are as follows.
A pair of magnets 5A and 5B are installed facing each other G
It is no. On the other hand, on the outer circumference of the yoke 3C, a focus coil 7 and a track direction drive coil (hereinafter referred to as
A track coil (referred to as a track coil) 9 is wound around the magnetic circuit to form a magnetic circuit.
対物レンズ１１は、保持体１３に固定されており、この
保持体１３には前記フォーカスコイル７が巻装されると
共に保持体１３の両側面に２対の前記トラックコイル９
が設けられている。The objective lens 11 is fixed to a holder 13, and the focus coil 7 is wound around the holder 13, and two pairs of the track coils 9 are arranged on both sides of the holder 13.
is provided.
板バネ体１５は、保持体１３をフォーカス方向（第１図
中矢印Ｂによって示す）に移動自在に支持するもので、
保持体１３がフォーカス方向に移動可能となる向きに複
数の板バネを平行に、保持体１３と後述の支持体１７と
の間に架設してなる。The leaf spring body 15 supports the holding body 13 so as to be movable in the focus direction (indicated by arrow B in FIG. 1).
A plurality of plate springs are installed in parallel between the holder 13 and a support 17, which will be described later, in a direction that allows the holder 13 to move in the focus direction.
支持体１７は、基台１に立設した支持軸１７ａを軸とし
て保持体１３をトラック方向（第１図中矢印Ａによって
示す）に回動自在に支持するもので、この支持体１７の
上記板バネ体１５の取付部に対向する側面には、楔状の
切込みをフォーカス方向に刻設して嵌合凹部１７ｂが形
成される。The support 17 supports the holder 13 rotatably in the track direction (indicated by arrow A in FIG. 1) about a support shaft 17a provided upright on the base 1. A fitting recess 17b is formed on the side surface of the leaf spring body 15 facing the attachment portion by carving a wedge-shaped notch in the focus direction.
固定装置１９は、駆動部１９ａと嵌合凸部１９ｂよりな
る。The fixing device 19 includes a driving portion 19a and a fitting convex portion 19b.
駆動部１９ａはソレノイド等を有するアクチュ：Ｌ−タ
であって、１■合凸部１９ｂを前後方向（第１図上で右
左方向、以下同様）に駆動する。嵌合凸部１９ｂは、前
面に前記支持体１７の嵌合凹部１７ｂに嵌脱自在に嵌合
する形状に突出して形成される。さらに駆動部１９ａは
基台１上の、嵌合凸部１９ｂを前方に繰り出したときに
嵌合凸部１９ｂｌｆｉ嵌合凹ｉ’Ｍ１１７ｂを押圧する
ように嵌合して保持体１３を固定し得る位置に固設され
る。The drive unit 19a is an actuator having a solenoid or the like, and drives the 1-convex convex portion 19b in the front-rear direction (right-left direction in FIG. 1, hereinafter the same). The fitting convex portion 19b is formed in a protruding shape on the front surface to be removably fitted into the fitting recess 17b of the support body 17. Furthermore, when the driving part 19a pushes the fitting convex part 19b on the base 1 forward, the driving part 19a can press the fitting convex part 19blfi and the fitting concave i'M117b to fix the holding body 13. Fixed in position.
次に本実施例の光学ヘッドを用いた場合のトラックアク
セスについて説明する。Next, track access when using the optical head of this embodiment will be explained.
まずリニアモータＬＭを駆動して対物レンズ１１を基台
１共、高速回転するターンテーブルＴ土に載ｉｅ１され
た光ディスクの所定のトラックの極近傍に高速移動して
粗アクセスを行なう。このとぎ固定装置１９は、駆動Ｐ
ＩＳ１９ ａの駆動によって嵌合凸部１９ｂを繰り出し
嵌合凸部１９ｂを支持体１７の嵌合凸部１７ｂに押圧し
て、嵌合四部１７ｂすなわち保持体１３を固定せしめる
。First, the linear motor LM is driven to move the objective lens 11 and the base 1 at high speed to a position very close to a predetermined track of the optical disk placed on the turntable T which rotates at high speed, thereby performing rough access. This sharpening fixing device 19 has a drive P
The fitting protrusion 19b is drawn out by driving the IS 19a, and the fitting protrusion 19b is pressed against the fitting protrusion 17b of the support body 17, thereby fixing the four fitting parts 17b, that is, the holder 13.
次に駆動部Ｈ１９ａは嵌合凸部１９ｂを繰り込み、嵌合
凹部１７ｂとの嵌合状態を解放する。Next, the drive portion H19a retracts the fitting convex portion 19b and releases the fitted state with the fitting recess 17b.
この嵌合凸部１９ｂの嵌合凹部１７ｂからの離脱と同時
に、トラックコイル９に電流が供給され、このトラック
コイル９とマグネット５Ａ、５Ｂとの電磁作用により対
物レンズ１１は、所定のトラックに微細（５）移動して
微細アクセスが終了する。Simultaneously with the separation of the fitting convex portion 19b from the fitting concave portion 17b, a current is supplied to the track coil 9, and the objective lens 11 is finely aligned to a predetermined track by the electromagnetic action between the track coil 9 and the magnets 5A and 5B. (5) Move and complete fine access.
このようにして、粗アクセスの際には対物レンズ１１は
固定されているので、リニアを−９１，Ｍを強力に駆動
して高速アクセスを行なうことができ、またこのような
高速アクセスを行なっても対物レンズが揺動することが
ないので粗アクセスの直後に、微細アクセスを行なうこ
とができ、トラックアクセスの所要時間を大幅に短縮す
ることができる。In this way, since the objective lens 11 is fixed during rough access, it is possible to perform high-speed access by strongly driving the linear and -91 M, and also to perform such high-speed access. Since the objective lens does not swing, fine access can be performed immediately after coarse access, and the time required for track access can be significantly shortened.
［発明の効果］
以上説明したように、本発明によれば対物レンズを保持
する保持体を固定手段を用いて離脱自在に固定するよう
にしたので粗アクセスの際に対物レンズが揺動すること
がなく光学ヘッドの高速アクセスが可能となった。[Effects of the Invention] As explained above, according to the present invention, since the holder that holds the objective lens is removably fixed using the fixing means, the objective lens does not swing during rough access. This enables high-speed access to the optical head.
第１図は本発明の一実施例の対物レンズの駆動装置を示
す拡大外形図であって、第２図は全体の外観を示す斜視
図、第３図は従来の対物レンズの駆動装置を承り斜視図
である。
１・・・基台 ３・・・ヨーク５・・・マ
グネッ１〜 ７・・・フォーカスコイル９・・・ト
ラックコイル １１・・・対物レンズ１３・・・保持体
° １５・・・板バネ体１７・・・支持体
１７ｂ・・・嵌合凹部１９・・・固定装置
１９ｂ・・・嵌合凸部片１”ｌ’ 入（パＦ ｌ−三
リＴ、 ｌｒ？：男第１７ （Ａ）
第１図 （Ｂ）
第３図FIG. 1 is an enlarged external view showing an objective lens driving device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the overall appearance, and FIG. 3 is a conventional objective lens driving device. FIG. 1... Base 3... Yoke 5... Magnet 1-7... Focus coil 9... Track coil 11... Objective lens 13... Holder ° 15... Leaf spring body 17...Support
17b... Fitting recess 19... Fixing device
19b...Mating convex piece 1"l' included (Fl-3 ReT, lr?: Male No. 17 (A) Fig. 1 (B) Fig. 3
Claims (3)
持する保持手段と、 この保持手段を離脱自在に固定する固定手段とを有する
ことを特徴とする光学ヘッド。(1) An optical head characterized by having a holding means for holding an objective lens that focuses light on an information storage medium, and a fixing means for removably fixing the holding means.
上の所定の位置に移動可能に保持することを特徴とする
特許請求の範囲第１項に記載の光学ヘッド。(2) The optical head according to claim 1, wherein the holding means movably holds the objective lens at a predetermined position on the information storage medium.
に当該固定手段に形成した嵌合部を嵌脱自在に嵌合して
保持手段を固定することを特徴とする特許請求の範囲第
１項に記載の光学ヘッド。(3) Claims characterized in that the fixing means fixes the holding means by removably fitting a fitting part formed on the holding means into a fitting part formed on the holding means. The optical head according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13409687A JPS63298821A (en) | 1987-05-29 | 1987-05-29 | Optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13409687A JPS63298821A (en) | 1987-05-29 | 1987-05-29 | Optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63298821A true JPS63298821A (en) | 1988-12-06 |
Family
ID=15120343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13409687A Pending JPS63298821A (en) | 1987-05-29 | 1987-05-29 | Optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63298821A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150343A (en) * | 1989-07-19 | 1992-09-22 | Matsushita Electric Industrial Co., Ltd. | Miniaturized low-power-consumption optical head provided with a state transformation mechanism |
| US5449763A (en) * | 1991-10-10 | 1995-09-12 | Henkel Corporation | Preparation of alkylpolyglycosides |
| US5734029A (en) * | 1991-10-10 | 1998-03-31 | Henkel Corporation | Preparation of improved alkypolygloycoside surfactant mixtures |
-
1987
- 1987-05-29 JP JP13409687A patent/JPS63298821A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150343A (en) * | 1989-07-19 | 1992-09-22 | Matsushita Electric Industrial Co., Ltd. | Miniaturized low-power-consumption optical head provided with a state transformation mechanism |
| US5449763A (en) * | 1991-10-10 | 1995-09-12 | Henkel Corporation | Preparation of alkylpolyglycosides |
| US5734029A (en) * | 1991-10-10 | 1998-03-31 | Henkel Corporation | Preparation of improved alkypolygloycoside surfactant mixtures |
| US5859218A (en) * | 1991-10-10 | 1999-01-12 | Henkel Corporation | Preparation of alkylpolyglycosides |
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| JPS6116041A (en) | Mobile support mechanism | |
| JPH05144015A (en) | Optical information recording and reproducing device |