JPH0261042B2 - - Google Patents
Info
- Publication number
- JPH0261042B2 JPH0261042B2 JP56194073A JP19407381A JPH0261042B2 JP H0261042 B2 JPH0261042 B2 JP H0261042B2 JP 56194073 A JP56194073 A JP 56194073A JP 19407381 A JP19407381 A JP 19407381A JP H0261042 B2 JPH0261042 B2 JP H0261042B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- amplifier circuit
- load
- signal
- inverting input
- 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
- 230000003287 optical effect Effects 0.000 description 9
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
- H03F3/3081—Duplicated single-ended push-pull arrangements, i.e. bridge circuits
Description
【発明の詳細な説明】
本発明は、たとえば、光学式記録再生装置にお
ける光学系の補正制御駆動に好適な補正駆動回路
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a correction drive circuit suitable for correction control driving of an optical system in, for example, an optical recording/reproducing apparatus.
近時、記録担体（デイスク）上に、音声信号あ
るいは映像信号を所定のおうとつ（凹凸）で記録
し、その記録を光学的に再生する方式が光学式記
録再生装置として実用化されるようになつた。か
かる装置では、光源として、He―Neレーザある
いは半導体レーザからの光ビームを用い、この光
ビームを上記デイスクの面に収束させ、かつ、そ
れが情報軌跡（トラツク）上に正しく位置するよ
うに制御する必要がある。 Recently, a method of recording an audio signal or a video signal on a record carrier (disc) with a predetermined roughness (concavities and convexities) and reproducing the recording optically has been put into practical use as an optical recording and reproducing device. Summer. Such devices use a light beam from a He-Ne laser or a semiconductor laser as a light source, converge this light beam onto the surface of the disk, and control it so that it is correctly positioned on the information track. There is a need to.
第１図は、上述の光学式記録再生装置の概要構
成図であり、デイスク１をモータ２で回転させな
がら、移送手段３によつてこれをそのトラツク方
向と垂直な方向に移動させ、同トラツク上のおう
とつ信号を光源４からの光ビーム５によつて検出
し、再生するものである。光ビーム５は、中間レ
ンズ６、半透明鏡７，１／４波長板８を通過し、
トラツキングミラーと称される反射鏡９によつて
その光軸を変更し、収束レンズ１０によつて、デ
イスク１の情報記録面上に収斂される。そして、
デイスク１で反射された光が、再び、収束レンズ
１０，トラツキングミラー９，１／４波長板８を
経て、さらに、半透明鏡７で光軸変更され、中間
レンズ１１を経由して受光検出器１２によつて検
知される。 FIG. 1 is a schematic configuration diagram of the above-mentioned optical recording/reproducing apparatus, in which a disk 1 is rotated by a motor 2 and moved by a transfer means 3 in a direction perpendicular to its track direction. The above signal is detected by a light beam 5 from a light source 4 and reproduced. The light beam 5 passes through an intermediate lens 6, a semi-transparent mirror 7, a quarter wave plate 8,
The optical axis is changed by a reflecting mirror 9 called a tracking mirror, and the light is converged onto the information recording surface of the disk 1 by a converging lens 10. and,
The light reflected by the disk 1 passes through the converging lens 10, the tracking mirror 9, and the quarter-wave plate 8 again, the optical axis is changed by the semi-transparent mirror 7, and the light is received and detected via the intermediate lens 11. detected by the device 12.
受光検出器１２は，４分割素子検出器あるいは
６分割素子検出器と呼ばれる多素子検出手段が用
いられ、その各素子より取り出される光電変換信
号から、それらを加算あるいは減算等の信号処理
手段によつて適宜処理して、デイスク１の記録信
号，焦点制御用の信号（以下、ホーカスエラー信
号という）およびトラツク位置制御用の信号（以
下、トラツキングエラー信号という）をそれぞれ
得ている。 The light receiving detector 12 uses a multi-element detection means called a 4-split element detector or a 6-split element detector, and uses signal processing means such as addition or subtraction from the photoelectric conversion signals extracted from each element. Then, a recording signal for the disk 1, a signal for focus control (hereinafter referred to as a focus error signal), and a signal for track position control (hereinafter referred to as a tracking error signal) are obtained, respectively.
ここで、ホーカスエラー信号は光ビーム５がデ
イスク１の記録面上に収斂される際の不十分さを
現わすものであり、また、トラツキングエラー信
号は、トラツク位置に対する光ビームの収斂位置
のずれ量を現わすものである。しかして、ホーカ
スエラー信号は収束レンズ１０を動かしてその焦
点制御を行なうのに用いられ、同収束レンズ１０
の移動はこれに取り付けられた可動用コイル１３
によつて行なわれる。また、トラツキングエラー
信号はトラツキングミラー９を動かすための可動
用コイル１４の制御信号に用いられる。すなわ
ち、受光検出器１２より得られるホーカスエラー
信号により、増幅回路１５および駆動回路１６を
用いて、可動用コイル１３の励磁電流を制御し、
また、トラツキングエラー信号により、増幅回路
１７および駆動回路１８を用いて、可動用コイル
１４の励磁電流を制御する。 Here, the focus error signal indicates the insufficient convergence of the light beam 5 on the recording surface of the disk 1, and the tracking error signal indicates the convergence position of the light beam with respect to the track position. This shows the amount of deviation. Therefore, the focus error signal is used to move the converging lens 10 to control its focus, and the focus error signal is used to control the focus of the converging lens 10.
The movement of the moving coil 13 attached to this
It is carried out by. Further, the tracking error signal is used as a control signal for the movable coil 14 for moving the tracking mirror 9. That is, the excitation current of the movable coil 13 is controlled using the amplifier circuit 15 and the drive circuit 16 based on the focus error signal obtained from the light receiving detector 12,
Furthermore, the excitation current of the movable coil 14 is controlled using the amplification circuit 17 and the drive circuit 18 based on the tracking error signal.
しかるに、可動用コイル１３ならびに同１４の
制御に交流成分の電圧を用いると、収束レンズ１
０ならびにトラツキングミラー９の動きに位相の
遅れを生じる。すなわち、可動用コイル１３なら
びに同１４のインダクタンスに依存して、駆動電
圧の交流周波数が高くなるほど、励磁電流の位相
遅れが著しくなり、正しい制御が不可能になる。 However, if AC component voltage is used to control the movable coils 13 and 14, the converging lens 1
This causes a phase delay in the movement of 0 and the tracking mirror 9. That is, depending on the inductance of the moving coils 13 and 14, the higher the AC frequency of the drive voltage, the more significant the phase delay of the excitation current becomes, making correct control impossible.
本発明は、収束レンズ１０ならびにトラツキン
グミラー９における上述のような動作上の問題点
を解消するものであり、負荷電流が、その負荷イ
ンピーダンスの性格には無関係に駆動回路の入力
駆動電圧と同位相になる回路構成を提供するもの
である。 The present invention solves the above-mentioned operational problems in the converging lens 10 and the tracking mirror 9, and the load current is the same as the input drive voltage of the drive circuit, regardless of the characteristics of the load impedance. This provides a circuit configuration that is in phase.
以下に、本発明を実施例により説明する。 The present invention will be explained below using examples.
第２図は本発明実施例の補正駆動回路であり、
２つの増幅回路１９および２０の各出力端子間に
負荷２１と抵抗素子２２を互いに直列に接続した
ものである。各増幅回路１９，２０はそれぞれ
＋，−と表記した反転非反転入力端子を有し、か
つ、利得は十分に大きいものである。そして、負
荷２１と抵抗素子２２との直列接続点（中間点）
と増幅回路の一方（第１の増幅回路）１９の非反
転入力端子とを共通電位に接続し、また、増幅回
路の他方（第２の増幅回路）２０の出力端子と同
増幅回路２０の非反転入力端子とを接続し、それ
ぞれ出力のフイードバツクループを形成してい
る。この回路構成において、第１の増幅回路１９
の反転入力端子２３にV1なる入力電圧が印加さ
れ、第２の増幅回路２０の反転入力端子２４に
V2なる入力電圧が印加されると、負荷２１およ
び抵抗素子２２を流れる負荷電流ILは、前記フイ
ードバツクの作用により原理的に、抵抗素子２２
の抵抗値をＲとするとき、
IL＝V1―V2／Ｒ
で表わされるものになる。なお、端子２５は駆動
回路電源用である。これより明らかなように、負
荷電流ILは負荷２１のインピーダンス成分には無
関係になり、この駆動回路に印加される電圧V1
およびV2と抵抗Ｒとによつて決定される。した
がつて、この負荷電流ILは入力電圧V1およびV2
と同位相になる。そこで、第２図の回路構成を前
記第１図示の光学式記録再生装置に適用すると、
第１図中の駆動回路１６および同１８を、それぞ
れ第２図示回路で置き換え、かつ、可動用コイル
１３および同１４を負荷２１と置き換えればよ
い。 FIG. 2 shows a correction drive circuit according to an embodiment of the present invention,
A load 21 and a resistance element 22 are connected in series between each output terminal of two amplifier circuits 19 and 20. Each of the amplifier circuits 19 and 20 has inverting and non-inverting input terminals labeled + and -, respectively, and has a sufficiently large gain. Then, the series connection point (intermediate point) between the load 21 and the resistive element 22
and the non-inverting input terminal of one of the amplifier circuits (first amplifier circuit) 19 are connected to a common potential, and the output terminal of the other amplifier circuit (second amplifier circuit) 20 and the non-inverting input terminal of the amplifier circuit 20 are connected to a common potential. They are connected to the inverting input terminal to form output feedback loops. In this circuit configuration, the first amplifier circuit 19
An input voltage of V 1 is applied to the inverting input terminal 23 of the second amplifier circuit 20, and an input voltage of V1 is applied to the inverting input terminal 24 of the second amplifier circuit 20.
When an input voltage of V 2 is applied, the load current I L flowing through the load 21 and the resistive element 22 will theoretically change due to the feedback effect described above.
When the resistance value of is R, it is expressed as I L =V 1 −V 2 /R. Note that the terminal 25 is for a drive circuit power supply. As is clear from this, the load current I L is independent of the impedance component of the load 21, and the voltage V 1 applied to this drive circuit is
and V 2 and the resistance R. Therefore, this load current I L depends on the input voltages V 1 and V 2
will be in phase with. Therefore, if the circuit configuration of FIG. 2 is applied to the optical recording/reproducing apparatus shown in FIG. 1,
The drive circuits 16 and 18 in FIG. 1 may be replaced with the second illustrated circuits, and the movable coils 13 and 14 may be replaced with the load 21.
これによつて、第１図の光学式記録再生装置
は、受光検出器１２から得られる前記ホーカスエ
ラー信号ならびに前記トラツキングエラー信号に
対応して、これらの信号と同位相で前記収束レン
ズ１０ならびに前記トラツキングミラー９を自在
に補正するように動かすことが可能である。 As a result, the optical recording/reproducing apparatus shown in FIG. The tracking mirror 9 can be moved freely for correction.
第３図は、本発明の別の実施例駆動回路であ
り、信号入力部に、トランジスタ２６および２７
よりなる差動増幅回路を設けたもので、それ以外
の回路要素は第２図のものと同じである。この回
路で、２８は差動増幅用の定電流源、２９は基準
電圧電源、３０および３１はトランジスタ２６，
３１の各コレクタ抵抗であり、入力端子３２に上
述の制御用信号を印加し、入力端子３３には前記
差動増幅回路の駆動用電源を接続して動作させ
る。動作状態では、両差動トランジスタ２６，２
７の各コレクタ信号が第１の増幅回路１９および
第２の増幅回路２０のそれぞれの反転入力端子に
加わる。したがつて、この回路構成によれば、第
１および第２の増幅回路１９，２０の反転入力信
号が互いに逆位相で動作するので、入力端子３２
に印加される制御入力信号に対して一段と大きな
制御負荷電流を供給し得ることになり、感度を向
上させることができる。また、この回路例は、入
力信号端子が１個であり、利用上も、入力信号処
理が簡単である。 FIG. 3 shows another embodiment of the drive circuit of the present invention, in which the signal input section includes transistors 26 and 27.
The other circuit elements are the same as those shown in FIG. 2. In this circuit, 28 is a constant current source for differential amplification, 29 is a reference voltage power supply, 30 and 31 are transistors 26,
31 collector resistors, the above-mentioned control signal is applied to the input terminal 32, and the drive power source for the differential amplifier circuit is connected to the input terminal 33 to operate the differential amplifier circuit. In the operating state, both differential transistors 26,2
7 collector signals are applied to respective inverting input terminals of the first amplifier circuit 19 and the second amplifier circuit 20. Therefore, according to this circuit configuration, since the inverted input signals of the first and second amplifier circuits 19 and 20 operate in opposite phases to each other, the input terminal 32
A much larger control load current can be supplied to the control input signal applied to the control input signal, and sensitivity can be improved. Further, this circuit example has only one input signal terminal, and input signal processing is simple in terms of use.
以上に詳記したように、本発明は、要約して、
反転，非反転入力端子を有する第１および第２の
増幅回路の各出力端子間に負荷回路と抵抗素子と
を直列に接続し、前記負荷回路と抵抗素子との中
間点を前記第１の増幅回路の非反転入力端子に接
続し、前記第２の増幅回路の出力端子を同第２の
増幅回路の非反転入力端子に接続して、前記第１
および第２の増幅回路の両反転入力端子に与えら
れる電圧の差により前記負荷回路電流を制御する
ことを特徴とする補正駆動回路である。本発明に
よれば、前記負荷回路のインピーダンスの性格に
かかわらず、入力の電圧信号と同位相の負荷電流
を形成し得るから、広帯域の入力信号に対応性よ
く負荷回路を動作させることができる。また、本
発明の駆動回路は、負荷回路部を外付けとする
と、回路構成が集積回路化に適し、広い利用分野
をもつものである。 As detailed above, the present invention summarizes:
A load circuit and a resistance element are connected in series between each output terminal of a first and second amplifier circuit having inverting and non-inverting input terminals, and a midpoint between the load circuit and the resistance element is connected to the first amplification circuit. a non-inverting input terminal of the circuit; an output terminal of the second amplifier circuit is connected to a non-inverting input terminal of the second amplifier circuit;
The correction drive circuit is characterized in that the load circuit current is controlled by a difference between voltages applied to both inverting input terminals of the second amplifier circuit and the second amplifier circuit. According to the present invention, a load current having the same phase as an input voltage signal can be formed regardless of the impedance characteristics of the load circuit, so that the load circuit can be operated with good compatibility with a wide band input signal. Further, the drive circuit of the present invention has a circuit configuration suitable for integration into an integrated circuit when the load circuit section is externally attached, and has a wide range of applications.
第１図は光学式記録再生装置の概要構成図、第
２図および第３図は本発明の補正駆動回路の各実
施例の回路図である。
１２……受光検出器、１３，１４……可動用コ
イル、１５，１７……増幅回路、１６，１８……
駆動回路、１９，２０……増幅回路、２１……負
荷、２２……抵抗素子。
FIG. 1 is a schematic configuration diagram of an optical recording/reproducing apparatus, and FIGS. 2 and 3 are circuit diagrams of each embodiment of the correction drive circuit of the present invention. 12... Light receiving detector, 13, 14... Moving coil, 15, 17... Amplifying circuit, 16, 18...
Drive circuit, 19, 20...Amplification circuit, 21...Load, 22...Resistance element.
Claims (1)
２の増幅回路の各出力端子間に負荷回路と抵抗素
子とを直列に接続し、前記負荷回路と抵抗素子と
の中間点を前記第１の増幅回路の非反転入力端子
に接続し、前記第２の増幅回路の出力端子を同第
２の増幅回路の非反転入力端子に接続して、前記
第１および第２の増幅回路の両反転入力端子に与
えられる第１および第２の入力電圧の差により前
記負荷回路電流を制御することを特徴とする補正
駆動回路。1. A load circuit and a resistance element are connected in series between each output terminal of a first and second amplifier circuit having inverting and non-inverting input terminals, and a midpoint between the load circuit and the resistance element is connected to the first amplifier circuit. The output terminal of the second amplifier circuit is connected to the non-inverting input terminal of the amplifier circuit, and the output terminal of the second amplifier circuit is connected to the non-inverting input terminal of the second amplifier circuit. A correction drive circuit characterized in that the load circuit current is controlled by a difference between first and second input voltages applied to the terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19407381A JPS5896314A (en) | 1981-12-02 | 1981-12-02 | Correction driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19407381A JPS5896314A (en) | 1981-12-02 | 1981-12-02 | Correction driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5896314A JPS5896314A (en) | 1983-06-08 |
| JPH0261042B2 true JPH0261042B2 (en) | 1990-12-19 |
Family
ID=16318501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19407381A Granted JPS5896314A (en) | 1981-12-02 | 1981-12-02 | Correction driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5896314A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0645242U (en) * | 1992-11-27 | 1994-06-14 | エス・オー・シー株式会社 | fuse |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0724003B2 (en) * | 1985-11-26 | 1995-03-15 | 株式会社東芝 | Constant current drive |
| JP2529492Y2 (en) * | 1986-06-12 | 1997-03-19 | パイオニア株式会社 | Actuator drive circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54143172A (en) * | 1978-04-28 | 1979-11-08 | Sony Tektronix Corp | Variable electrical current source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5096944U (en) * | 1974-01-08 | 1975-08-13 |
-
1981
- 1981-12-02 JP JP19407381A patent/JPS5896314A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54143172A (en) * | 1978-04-28 | 1979-11-08 | Sony Tektronix Corp | Variable electrical current source |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0645242U (en) * | 1992-11-27 | 1994-06-14 | エス・オー・シー株式会社 | fuse |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5896314A (en) | 1983-06-08 |
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