JPH0766546B2 - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPH0766546B2 JPH0766546B2 JP55171723A JP17172380A JPH0766546B2 JP H0766546 B2 JPH0766546 B2 JP H0766546B2 JP 55171723 A JP55171723 A JP 55171723A JP 17172380 A JP17172380 A JP 17172380A JP H0766546 B2 JPH0766546 B2 JP H0766546B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- tracking
- drive current
- optical
- tracking mechanism
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 本発明な光デイスク装置に係り，特にアクセス動作を簡
単な構成で正確に行ないうる光デイスク装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device of the present invention, and more particularly to an optical disk device that can perform an access operation accurately with a simple configuration.
一般に，光ビームを利用して回転するデイスクより信号
を再生する装置は，集光レンズを内蔵した光学ヘツドが
デイスクの回転に応じてデイスク半径方向に変位して通
常の再生動作を行なう構成としてある。この装置におい
ては，この他に，光学ヘツドを所定の番地のトラツク
（各トラツクには予め番地が付されている）に対向する
位置に高速で移送させる所謂アクセス動作の機能も有し
ている。従来の装置では，アクセス動作時にトラツキン
グ機構は制御されずにフリーな状態になつており，レン
ズはアクセス動作時に加えられる加振力によりトラツク
幅方向に不要な振動を起こす。このため，このレンズの
振動が原因で，目標とするトラツク番地への正確なアク
セスが出来ないという欠点を有する。In general, a device for reproducing a signal from a rotating disk using a light beam has a structure in which an optical head having a condenser lens is displaced in the radial direction of the disk according to the rotation of the disk to perform a normal reproducing operation. . In addition to this, this device also has a so-called access operation function of transferring the optical head at a high speed to a position facing a track at a predetermined address (each track has an address in advance). In the conventional device, the tracking mechanism is not controlled and is in a free state during the access operation, and the lens causes unnecessary vibration in the track width direction due to the exciting force applied during the access operation. For this reason, there is a drawback that the target track address cannot be accessed accurately due to the vibration of the lens.
本発明は，アクセス動作時にトラツキング機構をレンズ
の当該トラツキング機構に対する位置が変化しないよう
に制御して，アクセス動作を正確に行ない得る光デイス
ク装置を提供するにある。An object of the present invention is to provide an optical disk device capable of accurately performing an access operation by controlling the tracking mechanism so that the position of the lens with respect to the tracking mechanism does not change during the access operation.
次に本発明の光デイスク装置の各実施例について説明す
る。Next, each embodiment of the optical disk device of the present invention will be described.
第１図は本発明の一実施例である光デイスク装置１を示
す。同図中，デイスク２は情報信号が反射率の相違等と
して同心円又は螺旋状トラツク上に記録されているもの
であり，シヤーシ３に固定してあるモータ４により高速
回転する。デイスク２の回転に応じて，シヤリツジ５が
移送手段であるボイスコイルモータ６により矢印Ｘで示
すデイスク半径方向ひ移送され，キヤリツジ５に搭載し
てある光学ヘツド７により情報信号がデイスク２より再
生される。ボイスコイルモータ６は，磁気回路部6aとボ
イスコイル部6bとよりなる。FIG. 1 shows an optical disk device 1 which is an embodiment of the present invention. In the figure, a disk 2 has an information signal recorded on a concentric circle or a spiral track as a difference in reflectance, and is rotated at a high speed by a motor 4 fixed to a chassis 3. In accordance with the rotation of the disk 2, the carriage 5 is transferred by the voice coil motor 6 as a transfer means in the disk radial direction indicated by the arrow X, and the information signal is reproduced from the disk 2 by the optical head 7 mounted on the carrier 5. It The voice coil motor 6 comprises a magnetic circuit section 6a and a voice coil section 6b.
光学ヘツド７内には，第２図に示すように，集光レンズ
８と，このレンズ８を矢印Ｘ方向に変位可能に支持する
機構９と，レンズ８を矢印Ｘ方向に変位させるトラツキ
ング機構10と，図示を省略したフオーカス機構とが組込
まれている。トラツキング機構10は，ボイスコイルモー
タ11であり，磁気回路部11aとボイスコイル部11bとより
なる。レンズ支持機構９は，一端を固定部12に固定され
て平行に配された一対の板バネ13a,13bと，この板バネ1
3a,13b間に横架してある横架部材14とよりなり，板バネ
13a,13bの自由端間にレンズ８が固定してある。In the optical head 7, as shown in FIG. 2, a condenser lens 8, a mechanism 9 for supporting the lens 8 so as to be displaceable in the arrow X direction, and a tracking mechanism 10 for displacing the lens 8 in the arrow X direction. And a focus mechanism (not shown) are incorporated. The tracking mechanism 10 is a voice coil motor 11 and includes a magnetic circuit unit 11a and a voice coil unit 11b. The lens support mechanism 9 has a pair of leaf springs 13a and 13b fixed at one end to the fixing portion 12 and arranged in parallel, and the leaf spring 1
It is composed of a horizontal member 14 which is horizontally arranged between 3a and 13b,
The lens 8 is fixed between the free ends of 13a and 13b.
ノーマル再生時には，トラツキング機構10はトラツキン
グエラー信号，フオーカス機構はフオーカスエラー信号
を供給されて動作し，レンズ８が矢印Ｘ方向及び上下方
向に微小変位さえて，ビームがトラツク上に正確に集光
されてトラツク上を正確に走査し，情報信号が良好に再
生される。During normal reproduction, the tracking mechanism 10 operates by being supplied with a tracking error signal and the focus mechanism with a focus error signal, and the lens 8 is slightly displaced in the arrow X direction and the vertical direction, so that the beam is accurately collected on the track. The light is accurately scanned on the track, and the information signal is reproduced well.
第３図は本発明な要部をなすアクセス制御機構を示す。
アクセスする目標トラツク番地を設定すると，これに応
じた信号が，アクセス制御回路15に加えられ，これより
の信号が電力増幅器16で増幅されてボイスコイルモータ
６に加えられ，これが駆動して光学ヘツド７が高速で移
動する。このとき，光学ヘツド７内のレンズ８にはＦ＝
Ｍ・αとなる加振力が作用する。こゝでＭはレンズ８の
質量，αは光学ヘツド７即ちモータ６の加速度である。
この加振力に対する反作用が原因で，レンズ８は前記の
ように振動を起こすことになる。こゝで，質量Ｍは既知
の値であり，加速度αはボイスコイルモータ６のボイス
コイル6aに流れる電流の値に対応した値であり，結果的
に加振力Ｆはボイスコイル6aに流れる電流に対応した値
として求められる。FIG. 3 shows an access control mechanism which is an essential part of the present invention.
When the target track address to be accessed is set, a signal corresponding to this is applied to the access control circuit 15, and the signal from this is amplified by the power amplifier 16 and applied to the voice coil motor 6, which is driven to drive the optical head. 7 moves at high speed. At this time, the lens 8 in the optical head 7 has F =
Excitation force of M · α acts. Here, M is the mass of the lens 8 and α is the acceleration of the optical head 7, that is, the motor 6.
Due to the reaction to this exciting force, the lens 8 vibrates as described above. Here, the mass M is a known value, the acceleration α is a value corresponding to the value of the current flowing in the voice coil 6a of the voice coil motor 6, and as a result, the exciting force F is the current flowing in the voice coil 6a. Is obtained as a value corresponding to.
そこで，本実施例においては、モータ６のボイスコイル
6aに流れる電流を検出し，これをトラツキング制御回路
17に加え，こゝで処理してこれよりの制御電流をトラツ
キング機構10に加える。こゝで制御電流は，トラツキン
グ機構10が上記の加振力Ｆの反作用−Ｆを生じせしめる
所望の値としてある。従って，トラツキング機構10は，
レンズ８に上記反作用−Ｆを相殺するように動作し，レ
ンズ８はトラツキング機構10に対する位置を一定とされ
たまゝ，即ち移動方向に振動を起こさずに，デイスク半
径方向に高速で移動し，光ビームは正確に目標番地のト
ラツク上を走査する状態となる。Therefore, in this embodiment, the voice coil of the motor 6 is
The current flowing in 6a is detected and this is used as a tracking control circuit.
In addition to 17, the control current from this is added to the tracking mechanism 10. Here, the control current is a desired value that causes the tracking mechanism 10 to cause the reaction -F of the exciting force F described above. Therefore, the tracking mechanism 10
The lens 8 operates so as to cancel the above reaction -F, and the lens 8 moves at a high speed in the radial direction of the disk without causing vibration in the moving direction while keeping the position with respect to the tracking mechanism 10 constant. The beam is in a state of accurately scanning the track at the target address.
また本実施例においては、上記のようにモータ６のボイ
スコイル6aに流れる電流（駆動電流）を検出し、これを
トラッキング制御回路17に加え、ここで処理したことに
より得られる制御電流をトラッキング機構10（ボイスコ
イルモータ11）に加えレンズ８の駆動を行うことによ
り、レンズ８の振動発生を抑制する構成とされている。Further, in the present embodiment, the current (driving current) flowing in the voice coil 6a of the motor 6 is detected as described above, and this is added to the tracking control circuit 17, and the control current obtained by processing here is applied to the tracking mechanism. The vibration of the lens 8 is suppressed by driving the lens 8 in addition to the 10 (voice coil motor 11).
従って、本実施例では、ボイスコイルモータ６の動作に
より発生するレンズ８の振動を、ボイスコイル6aに流れ
る駆動電流によりレンズ８の振動を検出する構成とされ
ているため、特別な検出部材を設けることなく単純な電
流制御によってレンズ８の振動発生を確実に抑制するこ
とが可能となる。Therefore, in this embodiment, since the vibration of the lens 8 generated by the operation of the voice coil motor 6 is detected by the driving current flowing through the voice coil 6a, a special detection member is provided. It is possible to reliably suppress the occurrence of vibration of the lens 8 by simply controlling the electric current.
第４図及び第５図は夫々本発明装置の別の実施例の要部
を示す図であり，各図中第２図及び第３図に示す構成部
分と同一構成部分には同一符号を付しその説明は省略す
る。本実施例は，アクセス動作時でのレンズ８のトラツ
キング機構10に対する変位を板バネ13a,13bの変形量と
して検出し，これに応じてトラツキング機構10を補正制
御する構成としたものである。FIG. 4 and FIG. 5 are views showing the essential parts of another embodiment of the device of the present invention, respectively. In each drawing, the same constituent parts as those shown in FIG. 2 and FIG. However, its explanation is omitted. In this embodiment, the displacement of the lens 8 with respect to the tracking mechanism 10 during the access operation is detected as the deformation amount of the leaf springs 13a and 13b, and the tracking mechanism 10 is corrected and controlled accordingly.
第４図中,20a,20bは一組の歪ゲージであり，板バネ13a
の基部側の両面に貼着してある。同じく，別の一組の歪
ゲージ21a,21bが別の板バネ13bの基部側の両面に貼着し
てある。第５図は上記の歪ゲージ20a,20b,21a,21bを組
込んでなる制御回路を示す。歪ゲージ20aと21aとがその
端部を接続されて差動増幅器22の＋端子，歪ゲージ20b
と21bとがその端部を接続されて差動増幅器22の−端子
に夫々抵抗R3及びR4を介して接続してあり，差動増幅器
22は高ゲインで動作する。即ち，レンズ８の第４図に示
す中立位置に対する左右方向への変位を，板バネ13a,13
bに撓みに応じた歪ゲージ20a〜21bの抵抗変化として検
出し，差動増幅器22がこれに応じて正負の電流を出力す
る。支持機構９が第４図に示す中立位置にあるとき，差
動増幅器22よりの出力は零となる。差動増幅器22の出力
はトラツキング制御回路17に加えられ，当該回路17が所
定の制御電流を出力する。トラツキング機構10は，この
制御電流を加えられて，レンズ８を元の中立位置に戻す
ように動作する。In FIG. 4, 20a and 20b are a pair of strain gauges, and a leaf spring 13a.
It is attached to both sides of the base side of. Similarly, another pair of strain gauges 21a and 21b are attached to both sides of the base side of another leaf spring 13b. FIG. 5 shows a control circuit incorporating the strain gauges 20a, 20b, 21a, 21b. The strain gauges 20a and 21a are connected at their ends, and the + terminal of the differential amplifier 22 and the strain gauge 20b are connected.
And 21b and the differential amplifier 22 is connected to the end - terminal Yes connected via a respective resistor R 3 and R 4, the differential amplifier
The 22 operates at high gain. That is, the displacement of the lens 8 in the left-right direction with respect to the neutral position shown in FIG.
It is detected as a resistance change of the strain gauges 20a to 21b according to the bending in b, and the differential amplifier 22 outputs positive and negative currents accordingly. When the support mechanism 9 is in the neutral position shown in FIG. 4, the output from the differential amplifier 22 becomes zero. The output of the differential amplifier 22 is applied to the tracking control circuit 17, and the circuit 17 outputs a predetermined control current. The tracking mechanism 10 receives the control current and operates to return the lens 8 to the original neutral position.
これにより，アクセス動作時でのレンズ８の高速移動方
向上での振動が抑制され，アクセス動作が正確に行なわ
れる。As a result, the vibration of the lens 8 in the high speed movement direction during the access operation is suppressed, and the access operation is performed accurately.
また，本発明は光ビームを利用してデイスク上に信号を
記録する装置にも同様に適用できるものである。Further, the present invention can be similarly applied to an apparatus for recording a signal on a disk by using a light beam.
以上のように，本発明によれば，アクセス動作時にトラ
ツキング機構を作動させて集光レンズのトラツキング機
構に対する位置が変化しないように制御する構成として
あるため，アクセス動作時にレンズに起こりうる振動を
抑制し得，然してアクセス動作を正確に行なうことがで
き、またトラッキング制御手段は駆動電流検出手段が検
出する駆動電流値に基づき移送用駆動電流により移送手
段が発生する該光学レンズに作用する力を相殺させる力
を発生させるトラッキング用駆動電流値を求め、これを
該トラッキング機構に供給する構成とされているため、
レンズの振動を検出するための特別な検出部材を設ける
ことなく、移動手段に加えられる駆動電流に基づきレン
ズの振動（加振力）を検出する構成とされているため、
単純な電流制御によってレンズの振動発生を確実に抑制
することが可能となり、装置の構成を簡単化することが
できる等の効果を有する。As described above, according to the present invention, since the tracking mechanism is operated during the access operation so that the position of the condenser lens with respect to the tracking mechanism does not change, the vibration that may occur in the lens during the access operation is suppressed. Therefore, the access operation can be accurately performed, and the tracking control means cancels the force acting on the optical lens generated by the transfer means by the transfer drive current based on the drive current value detected by the drive current detection means. The driving current value for tracking for generating the force to be generated is calculated and supplied to the tracking mechanism.
Since it is configured to detect the vibration of the lens (exciting force) based on the drive current applied to the moving means, without providing a special detection member for detecting the vibration of the lens,
With simple current control, it is possible to reliably suppress the occurrence of lens vibration, and it is possible to simplify the configuration of the device.
第１図は本発明になる光デイスク装置の一実施例の概略
構成を示す図，第２図は第１図中光学ヘツド内の構造を
示す図，第３図はアクセス動作時に動作するトラツキン
グ制御回路を示す図，第４図及び第５図は本発明の要部
の別の実施例を示す図である。 １……光デイスク装置,2……デイスク,5……キヤリツ
ジ,6,11……ボイスコイルモータ,7……光学ヘツド,8…
…集光レンズ,9……レンズ支持機構,10……トラツキン
グ機構,12……固定部,13a,13b……板バネ,15……アクセ
ス制御回路,17……トラツキング制御回路,20a,20b,21a,
21b……歪ゲージ,22……差動増幅器。FIG. 1 is a diagram showing a schematic configuration of an embodiment of an optical disk device according to the present invention, FIG. 2 is a diagram showing a structure inside an optical head in FIG. 1, and FIG. 3 is a tracking control which operates during an access operation. FIGS. 4 and 5 showing a circuit are views showing another embodiment of the essential part of the present invention. 1 ... Optical disk device, 2 ... Disk, 5 ... Carriage, 6,11 ... Voice coil motor, 7 ... Optical head, 8 ...
… Condenser lens, 9 …… Lens support mechanism, 10 …… Tracking mechanism, 12 …… Fixed part, 13a, 13b …… Flat spring, 15 …… Access control circuit, 17 …… Tracking control circuit, 20a, 20b, 21a,
21b ... Strain gauge, 22 ... Differential amplifier.
Claims (1)
て該ディスク上で信号の記録／再生を行う光ディスク装
置において、 レンズ支持機構に支持されており該光ビームを集光させ
るレンズと、供給されるトラッキング用駆動電流に応じ
て該レンズをトラック方向に変位させるトラッキング機
構とを有する光学ヘッドと、 供給される移送用駆動電流に応じて、該光学ヘッドをデ
ィスク半径方向に移送させる移送手段と、 該移送手段が移送される際、該移送手段の移送用駆動電
流値に対応するトラッキング駆動用電流を該トラッキン
グ機構に供給し、該光学レンズに作用する力を相殺させ
る力を発生させるトラッキング制御手段と を備えてなることを特徴とする光ディスク装置。1. An optical disc device for condensing a light beam on a rotating disc for recording / reproducing a signal on the disc, comprising a lens supported by a lens supporting mechanism and condensing the light beam, An optical head having a tracking mechanism for displacing the lens in the track direction according to the supplied tracking drive current, and a transfer means for transferring the optical head in the disk radial direction according to the supplied transfer drive current. And a tracking drive current which, when the transfer means is transferred, supplies a tracking drive current corresponding to the transfer drive current value of the transfer means to the tracking mechanism to generate a force for canceling the force acting on the optical lens. An optical disk device comprising: a control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55171723A JPH0766546B2 (en) | 1980-12-05 | 1980-12-05 | Optical disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55171723A JPH0766546B2 (en) | 1980-12-05 | 1980-12-05 | Optical disk device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5794940A JPS5794940A (en) | 1982-06-12 |
| JPH0766546B2 true JPH0766546B2 (en) | 1995-07-19 |
Family
ID=15928468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55171723A Expired - Lifetime JPH0766546B2 (en) | 1980-12-05 | 1980-12-05 | Optical disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0766546B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5826331A (en) * | 1981-08-11 | 1983-02-16 | Nippon Telegr & Teleph Corp <Ntt> | Optical head |
| JPS59193553A (en) * | 1983-04-19 | 1984-11-02 | Nec Corp | Track accessing device of optical disk system |
| JPS59207439A (en) * | 1983-05-12 | 1984-11-24 | Nec Corp | Beam access device of optical disk system |
| JP2666248B2 (en) * | 1985-08-03 | 1997-10-22 | オリンパス光学工業株式会社 | Optical information recording / reproducing device |
| JPH0722744Y2 (en) * | 1986-04-22 | 1995-05-24 | 京セラ株式会社 | Light pickup |
| JPH0746426B2 (en) * | 1986-04-22 | 1995-05-17 | 京セラ株式会社 | High-speed random access method |
| JPH0775077B2 (en) * | 1987-01-22 | 1995-08-09 | 松下電器産業株式会社 | Optical disk device |
| JP2565408B2 (en) * | 1989-12-28 | 1996-12-18 | 日本マランツ株式会社 | Brake circuit for tracking optical pickups |
-
1980
- 1980-12-05 JP JP55171723A patent/JPH0766546B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5794940A (en) | 1982-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2000030275A (en) | Optical pickup assembly with adjustable tilt | |
| JPS6030017B2 (en) | disc playback device | |
| JPS645377B2 (en) | ||
| EP0316846A2 (en) | Optical apparatus | |
| JPH0766546B2 (en) | Optical disk device | |
| WO2005112012A1 (en) | Optical pickup and optical disk device | |
| JPH0765397A (en) | Optical disk device | |
| JPH11312327A (en) | Objective lens drive | |
| JPH06162540A (en) | Optical disk device | |
| JP2000067444A (en) | Objective lens drive | |
| JPS6158887B2 (en) | ||
| JP3251235B2 (en) | Information recording / reproducing device | |
| JP2751635B2 (en) | Optical disk drive | |
| JPH07320290A (en) | Optical disc recording / reproducing device | |
| JP2548109B2 (en) | Optical recording disk playback device | |
| JP3008994B2 (en) | Optical disk drive | |
| JP3189785B2 (en) | Light head | |
| JP2516738B2 (en) | Optical means driving device | |
| JP2002298389A (en) | Vibration detecting device and optical disk device provided with the vibration detecting device | |
| JPH11144280A (en) | Optical disk drive | |
| JPH06119641A (en) | Objective lens drive | |
| KR100400641B1 (en) | Focusing Actuator For Optical Pick-up Device | |
| JPS6057546A (en) | Optical head | |
| JPH0452811Y2 (en) | ||
| JPH10283642A (en) | Optical information recording / reproducing device |