JPS62259687A - Focus control device - Google Patents

Focus control device

Info

Publication number
JPS62259687A
JPS62259687A JP61101428A JP10142886A JPS62259687A JP S62259687 A JPS62259687 A JP S62259687A JP 61101428 A JP61101428 A JP 61101428A JP 10142886 A JP10142886 A JP 10142886A JP S62259687 A JPS62259687 A JP S62259687A
Authority
JP
Japan
Prior art keywords
disk
spindle
focus control
piezoelectric element
objective lens
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
Application number
JP61101428A
Other languages
Japanese (ja)
Inventor
Hajime Onda
恩田 一
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.)
NTN Corp
Original Assignee
NTN Toyo Bearing Co Ltd
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 NTN Toyo Bearing Co Ltd filed Critical NTN Toyo Bearing Co Ltd
Priority to JP61101428A priority Critical patent/JPS62259687A/en
Publication of JPS62259687A publication Critical patent/JPS62259687A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To automize the correction of the distance between a disk and objective lens by applying the voltage impressing the piezoelectric element interposed between the spindle for driving the disk and surface plate fixing the spindle by its positioning. CONSTITUTION:The spindle 14 driving with the rotation the disk 18 loaded on a turn table 13 is fitted to the surface plate 15 for fixing with positioning. A piezoelectric element 17 is inserted between the flange part 16 of the spindle 14 and the surface plate 15. The piezoelectric element 17 is extended by applying a voltage, the spindle 14 is thus pushed up to the upper part and the surface of the disk 8 and an objective lens 11 are approached. In this way, the focus control can be automized.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

この発明は光ディスク、光磁気ディスク等の原盤に所要
の信号を光学的に書込むディスク原盤カッティング装置
等に適用される焦点制御装置に関する。
The present invention relates to a focus control device applied to a disk master cutting device or the like that optically writes a required signal onto a master such as an optical disk or a magneto-optical disk.

【従来の技術】[Conventional technology]

レーザによるディスク原車をカッティングする装置にお
いて、レーザビームをできる限り細く絞って常にディス
ク面上で焦点を結ぶように、焦点位置制御を行なう必要
がある。 第4図及び第5図に示すように、光学台(I)は、焦点
制御サーボ機構を構成する要素としてのフォトディテク
タ(2)、半円柱レンズ(3)、偏光ビームスプリッタ
 (4)、レンズアクチュエータ(5)及び凹レンズ(
6)を有する。 また、書込み用パワーレーザビーム(7)を導入し、そ
れをディスク(8)に照射するため、凹レンズ(9) 
、2色性ミラー(10)及びレンズアクチュエータ(5
)に保持された対物レンズ(11)を有し、パワーレー
ザビーム(7)と焦点制御サーボ機構によって微小スポ
ット径に絞られ、ディスク (8)に照射される。
In a device that uses a laser to cut a disk original wheel, it is necessary to control the focal point position so that the laser beam is narrowed down as narrowly as possible and always focused on the disk surface. As shown in FIGS. 4 and 5, the optical bench (I) includes a photodetector (2), a semi-cylindrical lens (3), a polarizing beam splitter (4), and a lens actuator as elements constituting a focus control servo mechanism. (5) and concave lens (
6). In addition, a concave lens (9) is used to introduce a power laser beam (7) for writing and irradiate the disk (8) with it.
, dichroic mirror (10) and lens actuator (5)
), which is focused to a minute spot diameter by a power laser beam (7) and a focus control servo mechanism, and irradiated onto the disk (8).

【発明が解決しようとする問題点】[Problems to be solved by the invention]

上記焦点制御サーボ機構により制御できる範囲は± 0
.5鶴程度であり、ディスク原盤の面振れ、うねり、或
いは板厚の寸法差のバラツキが大きい場合は、正確にデ
ィスク面上に焦点を結ばなく、例えばディスク原盤を回
転支持するスピンドルのターンテーブルを厚さの異なる
ものに取り替える等をして、対処して′G)た。しかし
、部品取り替え操作は、機構部品の取り付け、取り外し
を行わなくてはならないので、非常に工数がかかるとい
う問題点があった。
The range that can be controlled by the above focus control servo mechanism is ± 0
.. If the disc master has surface runout, waviness, or variations in plate thickness dimensions, it may be difficult to focus accurately on the disc surface, and for example, the spindle turntable that rotationally supports the disc master may be difficult to focus on. I took measures such as replacing it with one of a different thickness. However, the component replacement operation requires a large number of man-hours since the mechanical components must be attached and removed.

【問題点を解決するための手段】[Means to solve the problem]

上記の問題点を解決するために、この発明は光学ヘッド
の対物レンズを駆動するアクチュエータと、光学台との
間、或いは、ディスク駆動用スピンドルと、該スピンド
ルを位置決め固定する定盤との間に圧電素子を介在させ
、該圧電素子に印加する電圧をかけることにより、ディ
スクと対物レンズとの距離を補正する構成としたもので
ある。
In order to solve the above-mentioned problems, the present invention provides an optical system that can be used between an actuator that drives an objective lens of an optical head and an optical bench, or between a disk drive spindle and a surface plate that positions and fixes the spindle. The structure is such that the distance between the disk and the objective lens is corrected by interposing a piezoelectric element and applying a voltage to the piezoelectric element.

【作 用】[For use]

電圧素子により光学ヘッドの対物レンズ部分(アクチュ
エータを含む)を、或いはディスク回転駆動用スピンド
ル全体を光軸方向に移動させ、ディスクの厚さが大幅に
変わった場合でも、ディスク表面が焦点制御範囲内にく
るように補正をする。
By using a voltage element to move the objective lens part of the optical head (including the actuator) or the entire disk rotation drive spindle in the optical axis direction, the disk surface can be kept within the focus control range even if the disk thickness changes significantly. Make corrections so that it appears.

【実施例】【Example】

第1図及び第2図において、焦点制御サーボ機構を構成
するフォトディテクタ(2)と、半円柱レンズ(3)と
、偏光ビームスプリッタ(4)と、2色性ミラー(10
)及び凹レンズ(6)(9)を配置した光学台(1)と
、上記凹レンズ(9) 、2色性ミラー(10)を経由
して、書込み用パワーレーザビーム(7)を導入し、こ
れをディスク(8)に照射する対物レンズ(11)を保
持するアクチュエータ(5)との間に圧電素子(12)
を挿入し、書込むべきディスク(8)のFj、厚が標準
のものより、大幅に薄い場合、対物レンズ(11)ハ標
準位置より大きく降下しないと、正確にディスク(8)
の面上に焦点を結ぶことができない。焦点制御用アクチ
ュエータ (5)自体は、通常± 0.5mm位の範囲
しかカバーできないため、±0,5龍以上の厚いディス
クや薄いディスクに対しては正確に焦点が結べない。 そこで、上記圧電素子(12)に電圧を印加すると、圧
電素子(12)は伸びて、アクチュエータ(5)を下方
に押し下げる。 これにより、ディスク(8)の表面が、アクチュエータ
(5)の作動範囲内に入ってくれば、通常の焦点制御サ
ーボ系がかけられる。ディスク板厚が厚い場合は、この
逆の動作となる。 第3図は本発明の第2の実施例で、ターンテーブル(1
3)に搭載されたディスク(8)を回転駆動させるスピ
ンドル(14)は、位置決め固定用定盤(15)に装着
されている。このスピンドル(14)のフランジ部(1
6)と、上記定盤(15)との間に圧電素子(17)を
挿入し、当該圧電素子(17)に電圧を印加すると、圧
電素子(17)は伸びてスピンドルは上方に押し上げら
れ、ディスク(8)の表面は、対物レンズ(11)に近
づき、焦点制御サーボの範囲内に持っていくことができ
るようになる。 上記のごとき光学系により、ディスク(8)にはその面
振れ、うねり等による焦点ずれをアクチュエータ (5
)を用いた焦点制御サーボ系により補正しながら照射す
る一方、リニアモータ(図示せず)を駆動して、ディス
ク(8)の内周から外周へ、または外周から内周へと記
録する。
1 and 2, a photodetector (2), a semi-cylindrical lens (3), a polarizing beam splitter (4), and a dichroic mirror (10) constituting the focus control servo mechanism are shown in FIGS.
) and concave lenses (6) and (9), a power laser beam for writing (7) is introduced via the concave lens (9) and the dichroic mirror (10). A piezoelectric element (12) is placed between the actuator (5) that holds the objective lens (11) that irradiates the disk (8) with the
If the thickness of the disk (8) to be written is significantly thinner than the standard one, the objective lens (11) must be lowered far below the standard position to ensure that the disk (8)
Unable to focus on the surface. Since the focus control actuator (5) itself can normally only cover a range of about ±0.5 mm, it cannot accurately focus on thick or thin disks of ±0.5 mm or more. Therefore, when a voltage is applied to the piezoelectric element (12), the piezoelectric element (12) expands and pushes the actuator (5) downward. As a result, when the surface of the disk (8) comes within the operating range of the actuator (5), a normal focus control servo system is applied. If the disk is thick, the operation is the opposite. FIG. 3 shows a second embodiment of the present invention, in which a turntable (1
A spindle (14) for rotationally driving the disk (8) mounted on the disk (3) is attached to a positioning and fixing surface plate (15). The flange portion (1) of this spindle (14)
6) and the surface plate (15), and when a voltage is applied to the piezoelectric element (17), the piezoelectric element (17) stretches and the spindle is pushed upward, The surface of the disk (8) is now close to the objective lens (11) and can be brought within range of the focus control servo. With the optical system as described above, the disc (8) has an actuator (5
) while correcting the irradiation using a focus control servo system using a servo system, while driving a linear motor (not shown) to record from the inner circumference to the outer circumference or from the outer circumference to the inner circumference of the disk (8).

【効 果】【effect】

以上のような構成であるから、この発明は以下に挙げる
ような効果がある。 (イ)、板厚のかなり大幅に異なるディスクに対しても
機械的段取りなしで、自動 的に焦点制御サーボが可能となる。 (ロ)1通常、原盤用ガラスは、一度使用したものも表
面を研削し直して、再利用 するが、この度に板厚が薄くなって使 用不可となる場合があるが、本発明の 機構により、何度も再利用が実質的に 可能となる。
With the above configuration, the present invention has the following effects. (b) Automatic focus control servo is possible without mechanical setup even for disks with considerably different plate thicknesses. (b) 1 Normally, once used master glass is re-ground and re-used, the plate thickness may become thinner and become unusable, but with the mechanism of the present invention, , it is practically possible to reuse it many times.

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

第1図及び第2図は本発明の第1の実施例を示す光学台
の正面図とその断面図、第3図は、本発明の第2の実施
例を示すスピンドル装着部の断面図、第4図及び第5図
は従来の光学台の正面図とその断面図である。
1 and 2 are a front view and a cross-sectional view of an optical bench showing a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of a spindle mounting part showing a second embodiment of the present invention. 4 and 5 are a front view and a sectional view of a conventional optical bench.

Claims (1)

【特許請求の範囲】[Claims] (1)、光学ヘッドの対物レンズを駆動するアクチュエ
ータと、光学台との間、或いは、ディスク駆動用スピン
ドルと、該スピンドルを位置決め固定する定盤との間に
圧電素子を介在させ、該圧電素子に印加する電圧をかけ
ることにより、ディスクと対物レンズとの距離を補正す
るようになしたことを特徴とする焦点制御装置。
(1) A piezoelectric element is interposed between an actuator that drives an objective lens of an optical head and an optical bench, or between a disk drive spindle and a surface plate that positions and fixes the spindle, and the piezoelectric element 1. A focus control device that corrects the distance between a disk and an objective lens by applying a voltage to the object lens.
JP61101428A 1986-05-01 1986-05-01 Focus control device Pending JPS62259687A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61101428A JPS62259687A (en) 1986-05-01 1986-05-01 Focus control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61101428A JPS62259687A (en) 1986-05-01 1986-05-01 Focus control device

Publications (1)

Publication Number Publication Date
JPS62259687A true JPS62259687A (en) 1987-11-12

Family

ID=14300433

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61101428A Pending JPS62259687A (en) 1986-05-01 1986-05-01 Focus control device

Country Status (1)

Country Link
JP (1) JPS62259687A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010142819A (en) * 2008-12-16 2010-07-01 Disco Abrasive Syst Ltd Apparatus for laser beam machining, method for controlling laser beam machining, and program for laser beam machining
CN102990223A (en) * 2011-09-15 2013-03-27 株式会社迪思科 Laser processing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010142819A (en) * 2008-12-16 2010-07-01 Disco Abrasive Syst Ltd Apparatus for laser beam machining, method for controlling laser beam machining, and program for laser beam machining
CN102990223A (en) * 2011-09-15 2013-03-27 株式会社迪思科 Laser processing apparatus

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