JPS60136923A - Lens driver - Google Patents
Lens driverInfo
- Publication number
- JPS60136923A JPS60136923A JP24397683A JP24397683A JPS60136923A JP S60136923 A JPS60136923 A JP S60136923A JP 24397683 A JP24397683 A JP 24397683A JP 24397683 A JP24397683 A JP 24397683A JP S60136923 A JPS60136923 A JP S60136923A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- speed
- drive coil
- drive
- coil
- 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
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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は光ディスク等のレンズ駆動装置に係り、特に低
周波の速度制御あるいは振動抑制に好適な駆動装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a lens driving device for an optical disk or the like, and particularly to a driving device suitable for low frequency speed control or vibration suppression.
駆動コイルに発生する誘導電圧を検出して速度フィード
バックするレンズ駆動方式は従来から数多く提案されて
いるが、大部分はコイルの端子間電圧から印加電圧を回
路的に差引いて対象物の速度に比例した誘導電圧をめ、
それなフィードバックして振動を抑制するもので、その
例として特開昭５７−６６５３４ ｋ第１図に示す。第
１図において、端子１には速度指令電圧■ｌ＠ が加え
られる。この場合、駆動コイル３の端子間電圧ｖｔｔ；
１次式で表わされる。Many lens drive methods have been proposed in the past that detect the induced voltage generated in the drive coil and feed back the speed, but most of them are proportional to the speed of the object by subtracting the applied voltage from the voltage between the terminals of the coil using a circuit. The induced voltage is
An example of this method is shown in FIG. 1 of Japanese Patent Application Laid-Open No. 57-66534K to suppress vibration. In FIG. 1, a speed command voltage ■l@ is applied to terminal 1. In this case, the voltage between the terminals of the drive coil 3 vtt;
It is expressed by a linear equation.
ここで几＠ １ Ｋ＠ ＠ ’Ｌはそれぞれ駆動コイル
３の直流抵抗、誘起電圧定数、自己インダクタンスを表
わす。またｉは駆動コイル３の電流、■は被駆動体の速
度を表わす。低周波領域で表わす場合、なるように値を
選べは差動アンプ４の出力はに、・■に比例する値とな
る。第１図の例ではこの値を微分して加速度成分を出し
てフィードバックしているので問題ないが、一般には駆
動コイル３の直流抵抗几、の製作時のばらつきは数％あ
シ、更に温度によっても変化するため差動アンプ４の出
力Ｖ、は大きな影響を受ける。すなわちアンプ２の出力
ｋ ｖ ｚとして、次式で表わされる。Here, 几＠1K＠＠＠L represent the DC resistance, induced voltage constant, and self-inductance of the drive coil 3, respectively. Further, i represents the current of the drive coil 3, and ■ represents the speed of the driven body. When expressed in a low frequency region, the output of the differential amplifier 4 will be a value proportional to . In the example shown in Figure 1, this value is differentiated to give the acceleration component and fed back, so there is no problem, but generally the DC resistance of the drive coil 3 varies by a few percent during manufacture, and furthermore, it depends on the temperature. The output V of the differential amplifier 4 is greatly affected by the change in the output voltage V of the differential amplifier 4. That is, the output k v z of the amplifier 2 is expressed by the following equation.
仮に几１＝几２ ＝Ｒ３＝几、に設定した時に、几、が
１０多大きくなると直流バイアス分である（２）式の第
１項は２．５−大きくなシ、速度を表わす第２項の電圧
は５チ小さくなる。光ディスクのレンズ駆動等に用いる
場合には、速度■が比較的低いために誘起電圧に、・Ｖ
の値は小さく、そのため２．５−の直流バイアスの変
動は請求める値に、・■と同等以上となる可能性が太き
い。If we set 几1 = 几2 = R3 = 几, and if 几 increases by 10, the first term of equation (2), which is the DC bias, becomes 2.5 - the second term, which represents the speed. The voltage of the term becomes 5 inches smaller. When used to drive a lens of an optical disk, etc., the speed ■ is relatively low, so the induced voltage is ・V
The value of is small, so there is a strong possibility that the variation in the DC bias of 2.5- will be a claimable value that is equal to or greater than .
本発明の目的は駆動コイルの直流抵抗の影響や回路の影
響を受けることなく、駆動コイルの誘起電圧全検出して
フィードバックし、振動抑制あるいは速度制御するレン
ズ駆動装置を提供することにめる。An object of the present invention is to provide a lens drive device that detects and feeds back the entire induced voltage of a drive coil to suppress vibration or control speed without being influenced by the direct current resistance of the drive coil or the circuit.
本発明は速度フィードバックによる振動抑制や速度制御
は比較的低周波領域で適用され、小形アクチュエータで
は自己インダクタンスによる電気的時定数が短かいこと
に着目し、誘起電圧測定期間と駆動期間を制御周波数に
比較し十分高い周波数で切換えることによシ、同一コイ
ルを検ｔｈコイルと駆動コイルとして兼用させたもので
ある。The present invention focuses on the fact that vibration suppression and speed control using speed feedback are applied in a relatively low frequency range, and that small actuators have short electrical time constants due to self-inductance. By comparing and switching at a sufficiently high frequency, the same coil can be used both as a detection coil and as a drive coil.
以下、本発明の一実施例を第２図および第３図によシ説
明する。第２図においての端子１には速度指令電圧Ｖｌ
ａ が加えられ、端子７には切替タイミングパルスＶＴ
が加えられる。切替タイミングパルスＶＴはアナログス
イッチ１１を切替えるのと、検出タイミング時に速度検
出信号をす／プルホールドするために遅延回路９を通し
てサンプルホールド回路１４を動作させる。アナログス
イッチ１１によってチョップされた指令電圧ＶＴは、ア
ンプ１２で増巾され駆動コイル３に加わる。この駆動電
圧によって被駆動物が加速され速度が変化するとコイル
に誘起電圧が発生する。チョップによってコイル駆動電
圧が零になると駆動コイル３の端子間には速度に比例し
た誘起電圧のみが発生しているのでこれをサンプルホー
ルドして速度信号としてフィードバックすることによシ
速度制御ができる。ある瞬間に一定の速度指令電圧Ｖ＋
・が端子６に加えられた場合の遅延回路９の出力ＶＤア
ンプ１２の出力ｖ、、コイルの端子間電圧ｖ１、サンプ
ルホールド回路出力ＶＳ、速度フィードバック電圧ｖｒ
の変化を表わすタイミングチャートを第３図に示す。切
替タイミングパルスは速度制御系の帯域周波数よりも十
分高い周波数で、かつコイルの端子間電圧がほぼ一定に
なる時間をある程度確保できる周波数とデユーティ比を
持つべきである。光ディスクのレンズを焦点合わせ引込
み動作させる場合、速度制御系の帯域周波数は１００Ｈ
ｚ程度で良いが、駆動コイルの電気的時定数は１００μ
Ｓ以下であるので切替タイミングパルスＶＴの周波数は
１ Ｋ Ｈｚ以上に取る仁とができ、１００Ｈｚの速度
側−が可能である。駆動電流を流す期間と速度検出する
ために駆動電流を切る期間のデユーティ−比は、コイル
駆動電圧Ｖ、およびコイル駆動電流のピーク値を低下さ
せる意味で駆動電流を流す期間が長い方が望ましいが、
速度検出のために誘起電圧Ｖ、が落ち着くための時間を
確保しなければならないので駆動電流を切っている時間
は駆動コイルの電気的時定数の３倍程度以上取る必要が
ある。また遅延回路９の遅延時間は誘起電圧Ｖ、が落ち
着いた瞬間にサンプルホールド回路１４を動作させるよ
うに選ぶべきである。An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Terminal 1 in Fig. 2 has a speed command voltage Vl.
a is applied, and a switching timing pulse VT is applied to terminal 7.
is added. The switching timing pulse VT switches the analog switch 11 and operates the sample hold circuit 14 through the delay circuit 9 in order to pull/hold the speed detection signal at the detection timing. The command voltage VT chopped by the analog switch 11 is amplified by the amplifier 12 and applied to the drive coil 3. When the driven object is accelerated by this drive voltage and its speed changes, an induced voltage is generated in the coil. When the coil drive voltage becomes zero due to chopping, only an induced voltage proportional to the speed is generated between the terminals of the drive coil 3, so speed control can be performed by sampling and holding this and feeding it back as a speed signal. Constant speed command voltage V+ at a certain moment
The output of the delay circuit 9 when ・is applied to the terminal 6, the output v of the VD amplifier 12, the voltage between the coil terminals v1, the sample hold circuit output VS, the speed feedback voltage vr
A timing chart showing changes in is shown in FIG. The switching timing pulse should have a frequency that is sufficiently higher than the band frequency of the speed control system, and should have a frequency and a duty ratio that can ensure a certain amount of time for the voltage between the terminals of the coil to become approximately constant. When focusing and retracting the optical disc lens, the band frequency of the speed control system is 100H.
The electrical time constant of the drive coil is approximately 100μ.
Since it is less than S, the frequency of the switching timing pulse VT can be set to 1 KHz or more, and a speed of 100 Hz is possible. Regarding the duty ratio between the period during which the drive current is passed and the period during which the drive current is cut off for speed detection, it is desirable that the period during which the drive current is passed be long in order to reduce the coil drive voltage V and the peak value of the coil drive current. ,
Since it is necessary to secure time for the induced voltage V to settle down for speed detection, the time during which the drive current is turned off must be approximately three times or more the electrical time constant of the drive coil. Further, the delay time of the delay circuit 9 should be selected so that the sample and hold circuit 14 is operated at the moment when the induced voltage V has settled down.
以上は速度制御回路の場合について説明したが、位置制
御回路での振動抑制等に用いる場合も、第２図の回路を
ほぼそのまま速度フィードバック回路として用いること
ができる。The above description has been made regarding the case of a speed control circuit, but the circuit shown in FIG. 2 can be used almost as it is as a speed feedback circuit also when used for vibration suppression in a position control circuit.
以上説明した様に、本発明では速度信号を検出する瞬間
は駆動コイル３に外部から電圧を加えないので、駆動コ
イル３の誘起電圧定数に、の他のパラメータの影響をほ
とんど受けないので安定した信号検出と制御が行なえる
。As explained above, in the present invention, no external voltage is applied to the drive coil 3 at the moment when the speed signal is detected, so the induced voltage constant of the drive coil 3 is hardly affected by other parameters, so it is stable. Can perform signal detection and control.
本発明によれば駆動コイルを速度検出コイルとして兼用
し、しかも誘起電圧定数以外のパラメータの影響をほと
んど受けないので、駆動部の構造を簡素化、小屋化でき
るとともに駆動回路も駆動コイルの定数に合わせて調整
する必要がないので組立調整作業が容易である。According to the present invention, the drive coil is also used as a speed detection coil, and it is hardly affected by parameters other than the induced voltage constant, so the structure of the drive section can be simplified and simplified, and the drive circuit also uses the constant of the drive coil. Assembly and adjustment work is easy because there is no need to make adjustments.
第１図は従来のレンズ駆動装置の一例を説明する図、第
２図は本発明の一実施例における回路構成図、第３図は
第２図の実施例のタイミングチャートを示す図である。
１・・・速度指令信号入力端子、３・・・駆動コイル、
７・・・切替タイミングパルス入力端子、９・・・遅延
回路、１４・・・サンプルホールド回路。
才 ） 図
；Ｉ′３ 図
か−＝［＝＝二二FIG. 1 is a diagram illustrating an example of a conventional lens driving device, FIG. 2 is a circuit diagram of an embodiment of the present invention, and FIG. 3 is a diagram showing a timing chart of the embodiment of FIG. 1... Speed command signal input terminal, 3... Drive coil,
7... Switching timing pulse input terminal, 9... Delay circuit, 14... Sample hold circuit. Figure; I'3 Figure -=[==22
Claims (1)
バックし速度を制御するレンズ駆動装置において、前記
駆動コイルに印加する電圧を繰返して切断、印加するス
イッチ部と上記印加電圧が！断されている間の駆動ごイ
ルの端子間電圧を保持するホールド部とを備えたことを
特徴とするレンズ駆動装置。 ２ ホールド部の出力の大きさを調整してフィードバッ
クすることを特徴とする特許請求の範囲第１項記載のレ
ンズ駆動装置。 ３、駆動コイルの印加電圧を切断する信号を遅延回路を
通してホールド部に加えて、駆動コイルの端子間電圧ｔ
ホールド部に係持させることを特徴とする特許請求の範
囲第１項記載のレンズ駆動装置。[Claims] 1. In a lens driving device that detects and feeds back an induced voltage generated in a drive coil to control speed, there is provided a switch unit that repeatedly cuts off and applies a voltage applied to the drive coil, and the applied voltage. but! 1. A lens drive device comprising: a hold section that holds a voltage between terminals of a drive coil while the drive coil is disconnected. 2. The lens driving device according to claim 1, wherein the magnitude of the output of the hold section is adjusted and fed back. 3. A signal for cutting off the voltage applied to the drive coil is applied to the hold part through a delay circuit, and the voltage t between the terminals of the drive coil is
2. The lens driving device according to claim 1, wherein the lens driving device is engaged with a holding portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24397683A JPS60136923A (en) | 1983-12-26 | 1983-12-26 | Lens driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24397683A JPS60136923A (en) | 1983-12-26 | 1983-12-26 | Lens driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60136923A true JPS60136923A (en) | 1985-07-20 |
Family
ID=17111846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24397683A Pending JPS60136923A (en) | 1983-12-26 | 1983-12-26 | Lens driver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60136923A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02187932A (en) * | 1989-01-12 | 1990-07-24 | Olympus Optical Co Ltd | Light beam moving device |
-
1983
- 1983-12-26 JP JP24397683A patent/JPS60136923A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02187932A (en) * | 1989-01-12 | 1990-07-24 | Olympus Optical Co Ltd | Light beam moving device |
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