JPH0482019A - Optical head driving device - Google Patents
Optical head driving deviceInfo
- Publication number
- JPH0482019A JPH0482019A JP19560290A JP19560290A JPH0482019A JP H0482019 A JPH0482019 A JP H0482019A JP 19560290 A JP19560290 A JP 19560290A JP 19560290 A JP19560290 A JP 19560290A JP H0482019 A JPH0482019 A JP H0482019A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- linear motor
- optical head
- coil
- signal
- 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 19
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000004886 head movement Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Moving Of Head For Track Selection And Changing (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光学式記録再生装置に用いられる光ヘッド駆動
装置に関し、特にリニアモータにより位置決めを行う光
ヘッド駆動装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical head drive device used in an optical recording/reproducing device, and more particularly to an optical head drive device that performs positioning using a linear motor.
従来の光ヘッド駆動装置は、光ヘッドの位置決め移動に
よってリニアモータコイルに生しる逆起電圧より光ヘッ
ドの移動速度を検出し、これにより速度信号を得て基準
速度信号との誤差信号によってリニアモータコイルを駆
動し、光ヘッドの速度制御を行なっていた。Conventional optical head driving devices detect the moving speed of the optical head from the back electromotive force generated in the linear motor coil by positioning the optical head, obtain a speed signal from this, and use the error signal from the reference speed signal to detect the moving speed of the optical head. It drove the motor coil and controlled the speed of the optical head.
上述した従来の方式においては、高周波数域におけるコ
イルインタフタンス成分によるインピータンスの増大に
より、光ヘッド移動速度検出に誤差が生じてしまうため
に、高精度の光ヘッド速度制御が困難となっていた。In the conventional method described above, the increase in impedance due to the coil intufftance component in the high frequency range causes errors in the detection of the optical head movement speed, making it difficult to control the optical head speed with high precision. .
本発明の光ヘッド駆動装置は、光ヘッドを記録媒体に対
して位置決め駆動するための基準速度信号を発生する基
準速度信号発生手段と、速度誤差信号を入力して前記光
へ・ノドの駆動する駆動コイルを有する駆動手段と、前
記駆動手段の前記駆動コイルに流れる電流を検比し電圧
に変換する電流検出回路と、前記駆動コイルの駆動電圧
を前記電流検出回路の出力電圧で減算する第１の減算ア
ンプと、前記第１の減算アンプの出力信号の高周波数成
分を減衰するフィルタと、前記基準速度信号発生手段の
出力電圧を前記フィルタの出力電圧で減算し、前記速度
誤差信号を出力する第２の減算アンプより構成されてい
る。The optical head driving device of the present invention includes a reference speed signal generating means for generating a reference speed signal for positioning and driving the optical head with respect to a recording medium, and a speed error signal inputted to drive the optical head. a drive means having a drive coil; a current detection circuit that compares the current flowing through the drive coil of the drive means and converts it into a voltage; and a first circuit that subtracts the drive voltage of the drive coil by the output voltage of the current detection circuit. a subtracting amplifier, a filter that attenuates high frequency components of the output signal of the first subtracting amplifier, and subtracting the output voltage of the reference speed signal generating means by the output voltage of the filter to output the speed error signal. It consists of a second subtraction amplifier.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示すプロ・ンク図である。FIG. 1 is a diagram showing one embodiment of the present invention.
第１図において、マイクロプロセ・ンサｌより送れらる
基準速度チークは、Ｉ）−Ａ変換器２に送られ、Ｄ−Ａ
変換器２よってアナログ化された基準速度信号１０は、
減算アンプＡ３に接続されている。一方、リニアモータ
コイル５に流れる電流は電流検出回路６において電圧に
変換され、これかりニアモータコイル５の両端電圧９と
て減算アンプＢ７において減算される。減算アンプＢ７
の出力は２次ローパスフィルタ８に接続され、この出力
は前述の減算アンプＡ３に接続され、２次口
ｌ−パスフィルタ８の出力と基準速度信号との差を出力
する。また、減算アンプＡ３呂力は、パワーアンプ４に
接続され、このパワーアンプ・１出力によってリニアモ
ータを駆動する。In FIG. 1, the reference speed cheek sent from the microprocessor l is sent to the I)-A converter 2, and the D-A
The reference speed signal 10 converted into analog by the converter 2 is
It is connected to subtraction amplifier A3. On the other hand, the current flowing through the linear motor coil 5 is converted into a voltage in a current detection circuit 6, and this voltage is subtracted from the voltage 9 across the linear motor coil 5 in a subtraction amplifier B7. Subtraction amplifier B7
The output of is connected to the second-order low-pass filter 8, and this output is connected to the aforementioned subtraction amplifier A3, which outputs the difference between the output of the second-order L-pass filter 8 and the reference speed signal. Further, the subtraction amplifier A3 is connected to the power amplifier 4, and the linear motor is driven by the output of this power amplifier.
ここて、２次ローパスフィルタ８は、減算アンプＢ７に
より得られるリニアモータコイルの逆起電圧（速度信号
）の高周波数域てのコイルインダクタンスによるゲイン
増大と位相の変化とを補正するものである。また、逆起
電圧に対しインダクタンスは、２次系て影響するため、
直線的なケイン及び位相特性を得るためには、２次のロ
ーパスフィルタで高域ケイン位相を補正する必要かある
。リニアモータが速度ＶｅＩで移動する場合、リニアモ
ータコイルの両端電圧Ｖは、
Ｖ＝Ｒ−・ Ｔ ＋ＫＢ ・ Ｖｅ １て表わされ
る。ここて、Ｒｏはコイルの直流抵抗、ＫＢは誘導逆起
電圧定数、■はコイル電流をそれぞれ示す。従って、移
動速度Ｖｅｌは、Ｖｅ ｌ ＝ （Ｖ−ＲＩ！ｌ・Ｔ
） ／ＫＢで表わされる。電流検出回路６ではりニアモ
ータコイル電流の大きさをコイルに直列接続された抵抗
の両端より電圧として取り出し、これを一定の増幅率で
増幅する。この場合Ｒ，・■を出力するよう動作してい
る。電流検出回路６出力とりニアモータコイル両端電圧
は減算アンプＢ７にて減算され、Ｔ ／ Ｋ ８倍され
出力する。即ち、減算アンプＢ７出力は、（Ｖ−Ｒ，・
Ｉン／ＫＢを出力し、これがリニアモータの移動速度を
示す。続いて、速度信号１１と基準速度信号１０とは減
算アンプＡ３て減算され、速度誤差信号１２となり、パ
ワーアンプ４で増幅されてリニアモータコイルを駆動し
、光ヘッドの速度制御を行なう６〔発明の効果〕
以上説明したように本発明は、２次ローパスフィルタを
用いてリニアモータコイルのインダクタンス成分による
高周波数域での速度検出誤差を低減したため、より高精
度なりニアモータ移動速度検出が可能となる。Here, the secondary low-pass filter 8 corrects the gain increase and phase change due to the coil inductance in the high frequency range of the back electromotive force (speed signal) of the linear motor coil obtained by the subtraction amplifier B7. Also, since inductance affects the back electromotive force as a secondary system,
In order to obtain linear cane and phase characteristics, it is necessary to correct the high-frequency cane phase using a second-order low-pass filter. When the linear motor moves at speed VeI, the voltage V across the linear motor coil is expressed as: V=R-.T+KB.Ve1. Here, Ro represents the direct current resistance of the coil, KB represents the induced back electromotive force constant, and ■ represents the coil current. Therefore, the moving speed Vel is Vel = (V-RI!l・T
)/KB. The current detection circuit 6 extracts the magnitude of the near motor coil current as a voltage from both ends of a resistor connected in series with the coil, and amplifies this at a constant amplification factor. In this case, it operates to output R, . The voltage across the near motor coil output from the current detection circuit 6 is subtracted by a subtraction amplifier B7, multiplied by T/K by 8, and output. That is, the subtraction amplifier B7 output is (V-R, ·
Outputs Iin/KB, which indicates the moving speed of the linear motor. Subsequently, the speed signal 11 and the reference speed signal 10 are subtracted by a subtracting amplifier A3 to become a speed error signal 12, which is amplified by a power amplifier 4 to drive a linear motor coil and control the speed of the optical head. [Effect] As explained above, the present invention uses a secondary low-pass filter to reduce the speed detection error in the high frequency range due to the inductance component of the linear motor coil, so it is possible to detect the moving speed of the near motor with higher accuracy. .
第１図は本発明の一実施例を示すブロック図である。
１・・・・・・マイクロプロセッサ、２・・・・・・Ｄ
−Ａ変換器、３・・・・・・減算アンプＡ、４・・・・
・パワーアンプ、５・・・・・・リニアモータコイル、
６・・・・・・電流検出回路、７・・・・・・減算アン
プＢ、８・・・・・・２次ローパスフィルタ、９・・・
・・・コイル両端電圧、１０・・・・・基準速度信号、
１１・・・・・・速度信号、１２・・・・・速度誤差信
号。FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Microprocessor, 2...D
-A converter, 3... Subtraction amplifier A, 4...
・Power amplifier, 5...Linear motor coil,
6...Current detection circuit, 7...Subtraction amplifier B, 8...Second-order low-pass filter, 9...
...Voltage across the coil, 10...Reference speed signal,
11...Speed signal, 12...Speed error signal.
Claims (1)
基準速度信号を発生する基準速度信号発生手段と、速度
誤差信号を入力して前記光ヘッドの駆動する駆動コイル
を有する駆動手段と、前記駆動手段の前記駆動コイルに
流れる電流を検出し電圧に変換する電流検出回路と、前
記駆動コイルの駆動電圧を前記電流検出回路の出力電圧
で減算する第１の減算アンプと、前記第１の減算アンプ
の出力信号の高周波数成分を減衰するフィルタと、前記
基準速度信号発生手段の出力電圧を前記フィルタの出力
電圧で減算し、前記速度誤差信号を出力する第２の減算
アンプとを備え、前記ヘッドを速度制御することを特徴
とする光ヘッド駆動装置。a reference speed signal generating means for generating a reference speed signal for positioning and driving the optical head with respect to a recording medium; a driving means having a driving coil for driving the optical head by inputting a speed error signal; and the driving means. a current detection circuit that detects the current flowing through the drive coil and converts it into a voltage; a first subtraction amplifier that subtracts the drive voltage of the drive coil by the output voltage of the current detection circuit; The head includes a filter that attenuates high frequency components of the output signal, and a second subtraction amplifier that subtracts the output voltage of the reference speed signal generating means by the output voltage of the filter and outputs the speed error signal. An optical head drive device characterized by speed control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19560290A JPH0482019A (en) | 1990-07-24 | 1990-07-24 | Optical head driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19560290A JPH0482019A (en) | 1990-07-24 | 1990-07-24 | Optical head driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0482019A true JPH0482019A (en) | 1992-03-16 |
Family
ID=16343888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19560290A Pending JPH0482019A (en) | 1990-07-24 | 1990-07-24 | Optical head driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0482019A (en) |
-
1990
- 1990-07-24 JP JP19560290A patent/JPH0482019A/en active Pending
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