JPS6085444A - Tracking servo circuit - Google Patents

Tracking servo circuit

Info

Publication number
JPS6085444A
JPS6085444A JP58193104A JP19310483A JPS6085444A JP S6085444 A JPS6085444 A JP S6085444A JP 58193104 A JP58193104 A JP 58193104A JP 19310483 A JP19310483 A JP 19310483A JP S6085444 A JPS6085444 A JP S6085444A
Authority
JP
Japan
Prior art keywords
tracking
guide groove
signal
address
disc
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
JP58193104A
Other languages
Japanese (ja)
Inventor
Takeo Toyama
外山 建夫
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP58193104A priority Critical patent/JPS6085444A/en
Publication of JPS6085444A publication Critical patent/JPS6085444A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording 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
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only

Abstract

PURPOSE:To perform stable tracking servo by providing a preceding value holding circuit which holds a tracking signal obtained by tracking a guide groove, and outputs this tracking signal when an address part is tracked. CONSTITUTION:When a laser light tracks a guide groove 2 on a disc 1, a switch 8 is turned on, and the output of a differential amplifier 6 is not only held in a capacitor 10 but also applied to a driving part 11 through a buffer 9. The driving part 11 controls an optical system 4. Meanwhile, when the laser light tracks an address part 3 on the disc 1, the switch 8 is turned off, and the signal held in the capacitor 10 is applied to the driving part 11 through the buffer 9. The driving part 11 controls the optical system 4. Consequently, tracking signals obtained by tracking the guide groove 2 and the address part 3 on the disc 1 continuously are tracking signals obtained by tracking the guide groove 2. Thus, the noise of tracking signals due to a difference of signal recording states to the disc is eliminated.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明は、レーザ光をディスクに照射することによって
情報の記憶および再生が行なわれる光デイスク記録装置
におけるトラッキングサーボ回路に関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a tracking servo circuit in an optical disk recording device in which information is stored and reproduced by irradiating the disk with laser light.

(ロ)従来技術 1− この極光ディスク記録装置として、文書情報をディジタ
ル信号の形でディスク上に記録し、必要に応じて再生す
る情報ファイル装置がある。第1図に斯る情報ファイル
装置に用いられるディスク(1)を示す。ディスク(1
)には同心円状の案内溝く2)が形成されており、この
案内溝(2)上に情報の記録が行なわれる。更に各案内
溝(2)にはアドレス部(3)が設けられ、このアドレ
ス部(3)のアドレス信号を読み出し、所望の案内溝(
2)を検索する。
(b) Prior Art 1 - As this ultra-optical disk recording device, there is an information file device that records document information on a disk in the form of a digital signal and reproduces it as necessary. A disk (1) used in the information file device shown in FIG. 1 is shown. Disc (1
) is formed with a concentric guide groove 2), and information is recorded on this guide groove (2). Further, each guide groove (2) is provided with an address section (3), and the address signal of this address section (3) is read out and the desired guide groove (
2) Search.

ところで、情報の記録および再生時には、案内溝(2)
を確実にトラッキングしなければならない。そこで案内
溝(2)にビーム光を照射し、その反射光を光電変換素
子を備えた光検出器にて検出してトラッキング信号を形
成し、トラッキングサーボを行なっている。第2図(a
)は案内溝く2)から得られるトラッキング信号であり
、ディスクの偏心による信号が得られる。
By the way, when recording and reproducing information, the guide groove (2)
must be tracked reliably. Therefore, the guide groove (2) is irradiated with a beam of light, and the reflected light is detected by a photodetector equipped with a photoelectric conversion element to form a tracking signal, thereby performing tracking servo. Figure 2 (a
) is a tracking signal obtained from the guide groove 2), and a signal due to eccentricity of the disk is obtained.

ところが、ディスク(1)において、アドレス部(3)
に記録されているアドレス信号は凹凸の状態2− であり、また案内溝(2)に記録される情報は孔の有無
の状態であるので、案内溝(2)とアドレス部(3)を
連続的にトラッキングして得られるトラ・ンキング信号
は第2図(b)に示す如く、案内溝(2)とアドレス部
(3)との境界部で大きなノイズが発生する。このノイ
ズはトラッキングサーボの乱れの原因となる。
However, in the disk (1), the address part (3)
The address signal recorded in is the state of unevenness 2-, and the information recorded in the guide groove (2) is the presence or absence of holes, so the guide groove (2) and address part (3) are connected continuously. As shown in FIG. 2(b), in the tracking signal obtained by tracking, a large amount of noise occurs at the boundary between the guide groove (2) and the address section (3). This noise causes disturbances in the tracking servo.

(ハ)発明の目的 本発明の目的は、上述のノイズを除去することによって
、安定したトラッキングサーボを行なうことにある。
(c) Purpose of the Invention An object of the present invention is to perform stable tracking servo by removing the above-mentioned noise.

(ニ)発明の構成 本発明のトラッキングサーボ回路は、アドレス信号が記
録されたアドレス部と案内溝とが予め形成されたディス
クにビーム光を照射し、その反射光もしくは透過光を光
検出器にて検出したトラ・7キング信号に基いてトラッ
キングサーボを行なう回路において、上記案内溝をトラ
・ンキングすることによって得られるトラッキング信号
を保持し、斯るトラッキング信号をアドレス部のトラツ
キン3− グ時に出力する前値保持回路を具備したものである。
(D) Structure of the Invention The tracking servo circuit of the present invention irradiates a beam light onto a disk in which an address portion in which an address signal is recorded and a guide groove are formed in advance, and transmits the reflected light or transmitted light to a photodetector. In the circuit that performs tracking servo based on the tracking signal detected by the tracker, the tracking signal obtained by tracking the guide groove is held, and this tracking signal is output when tracking the address section. It is equipped with a previous value holding circuit.

(*)実施例 第3図に本発明の一実施例を示す。ディスク(1)は第
1図に示すように案内溝く2)と各案内溝(2)に凹凸
状でアドレス信号が形成されたアドレス部(3)とを有
する。このディスク(1〉に情報の記録時もしくは再生
時に、光学系(4)よりレーザ光が照射され、情報の記
録もしくは再生が行なわれる。そして、ディスク(1)
からの反射光は、一対の光電変換器(5a)(5b)で
受光され、各光電変換器(5a)(5b)の出力が差動
増幅器(6)にて演算される。この時、レーザ光がディ
スク(1)の案内溝(2)を完全にトラッキングしてお
れば、差動増幅器(6)の出力は0であるが、トラッキ
ングにずれがあると、斯るずれの方向によって差動増幅
器(6)から正または負の信号が出力きれる。斯る信号
は前値保持回路(7)を介して駆動部<11)に印加さ
れる。駆動部(11)は印加された信号によって光学系
(4)を制御し、トラッキングサーボを行な4− う。
(*) Embodiment FIG. 3 shows an embodiment of the present invention. As shown in FIG. 1, the disk (1) has guide grooves 2) and address portions (3) in which address signals are formed in a concavo-convex shape in each guide groove (2). When recording or reproducing information on this disk (1), a laser beam is irradiated from the optical system (4) to record or reproduce information.Then, the disk (1)
The reflected light is received by a pair of photoelectric converters (5a) (5b), and the output of each photoelectric converter (5a) (5b) is calculated by a differential amplifier (6). At this time, if the laser beam perfectly tracks the guide groove (2) of the disk (1), the output of the differential amplifier (6) will be 0, but if there is any deviation in tracking, the output of the differential amplifier (6) will be 0. Depending on the direction, the differential amplifier (6) can output a positive or negative signal. Such a signal is applied to the drive section <11) via the previous value holding circuit (7). The drive section (11) controls the optical system (4) according to the applied signal to perform tracking servo.

本発明の特徴である前値保持回路く7)は、直列に接続
きれたスイッチ(8)およびバッファ(9)と、バッフ
ァ(9)に並列に接続されたコンデンサ(10〉とから
構成されている。レーザ光がディスク(1)の案内*(
2’)をトラッキングしている時、スイッチ(8)はO
N状態であり、差動増幅器(6)の出力は、コンデンサ
(10〉に保持されると共に、バッファ(9)を経て駆
動部(11)へ印加される。そして駆動部〈11)は光
学系(4)を制御する。一方、レーザ光がディスク(1
)のアドレス部〈3)をトラ・ンキングしている時、ス
イッチ(8)はOFF状態となり、コンデンサ(10)
に保持されている信号がバッファ(9)を経て駆動部(
11)へ印加される。そして駆動部(11)は光学系(
4)を制御する。
The previous value holding circuit 7), which is a feature of the present invention, is composed of a switch (8) and a buffer (9) connected in series, and a capacitor (10) connected in parallel to the buffer (9). The laser beam guides the disc (1) *(
2'), the switch (8) is set to O.
The output of the differential amplifier (6) is held in the capacitor (10) and is applied to the driver (11) via the buffer (9).The driver (11) is connected to the optical system. (4). On the other hand, the laser beam is on the disk (1
), the switch (8) is in the OFF state, and the capacitor (10) is
The signal held in the buffer (9) passes through the drive unit (
11). And the drive part (11) is an optical system (
4) Control.

従って、ディスク(1)の案内溝(2)およびアドレス
部(3)を連続的にトラッキングして得られるトラッキ
ング信号は、全て案内溝(2)をトラッキングして得ら
れるトラッキング信号となり、従来、案内部〈2)とア
ドレス部(3)との境界部で発5− 生していた大きなノイズを除去することができる。
Therefore, the tracking signal obtained by continuously tracking the guide groove (2) and address area (3) of the disk (1) is the tracking signal obtained by tracking the guide groove (2), and conventionally, the tracking signal obtained by tracking the guide groove (2) and the address area (3) is It is possible to remove the large noise occurring at the boundary between the address section (2) and the address section (3).

ここで、上述のようなスイッチ(8)の0N−OFF制
御は、制御信号C0NTにて行なわれる。この制御信号
C0NTは、ディスク(1)のある位置に孔の形状でI
形成された同期信号を検出し、アドレス部(3)の位置
を予測することによって作成することができる。
Here, ON-OFF control of the switch (8) as described above is performed using the control signal C0NT. This control signal C0NT is applied to the disk (1) in the form of a hole at a certain position.
It can be created by detecting the formed synchronization signal and predicting the position of the address part (3).

なお、前値保持回路(7)として、スイッチ(8)をト
ランジスタ等のスイッチング素子で構成することができ
る。また、前値保持回路(7〉は、一般にサンプルホー
ルド回路と呼ばれている周知の回路で構成することがで
きる。
Note that, as the previous value holding circuit (7), the switch (8) can be configured with a switching element such as a transistor. Further, the previous value holding circuit (7>) can be constituted by a well-known circuit generally called a sample and hold circuit.

(へ)発明の効果 本発明によれば、ディスクへの信号の記録状態の違いか
ら生じるトラッキング信号のノイズを除去することがで
きるので、安定したトラッキングサーボを行なうことが
できる。
(F) Effects of the Invention According to the present invention, it is possible to remove noise in the tracking signal caused by differences in the recording state of signals on the disk, so that stable tracking servo can be performed.

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

第1図はディスクを示す上面図、第2図(a)および(
b)はトラッキング信号を示す信号波形図、第3図は本
発明の一実施例を示す回路図である。 (1)・・・ディスク、(7)・・・前値保持回路。 7− 第1図 第2図
Figure 1 is a top view showing the disk, Figures 2 (a) and (
b) is a signal waveform diagram showing a tracking signal, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. (1)...Disk, (7)...Previous value holding circuit. 7- Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] (1)アドレス信号が記録されたアドレス部と案内溝と
が予め形成されたディスクにビーム光を照射し、その反
射光もしくは透過光を光検出器にて検出したトラッキン
グ信号に基いてトラッキングサーボを行なう回路におい
て、上記案内溝をトラッキングすることによって得られ
るトラッキング信号を保持し、斯るトラッキング信号を
アドレス部のトラッキング時に出力する前値保持回路を
具備したことを特徴とするトラッキングサーボ回路。
(1) A beam of light is irradiated onto a disk on which an address area and a guide groove are pre-formed where address signals are recorded, and a tracking servo is activated based on the tracking signal that is detected by a photodetector by detecting the reflected or transmitted light. A tracking servo circuit comprising a previous value holding circuit that holds a tracking signal obtained by tracking the guide groove and outputs the tracking signal when tracking an address section.
JP58193104A 1983-10-14 1983-10-14 Tracking servo circuit Pending JPS6085444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58193104A JPS6085444A (en) 1983-10-14 1983-10-14 Tracking servo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58193104A JPS6085444A (en) 1983-10-14 1983-10-14 Tracking servo circuit

Publications (1)

Publication Number Publication Date
JPS6085444A true JPS6085444A (en) 1985-05-14

Family

ID=16302303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58193104A Pending JPS6085444A (en) 1983-10-14 1983-10-14 Tracking servo circuit

Country Status (1)

Country Link
JP (1) JPS6085444A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60246030A (en) * 1984-05-21 1985-12-05 Matsushita Electric Ind Co Ltd Tracking controller
JPS63142531A (en) * 1986-12-05 1988-06-14 Sony Corp Servo-circuit for optical disk information recording and reproducing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60246030A (en) * 1984-05-21 1985-12-05 Matsushita Electric Ind Co Ltd Tracking controller
JPS63142531A (en) * 1986-12-05 1988-06-14 Sony Corp Servo-circuit for optical disk information recording and reproducing device
US5079757A (en) * 1986-12-05 1992-01-07 Sony Corporation Servo circuit for an optical disk information recording and reproducing apparatus with improved stability for tracking and focusing control

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