JPH0630157B2 - Digital Disc Player - Google Patents
Digital Disc PlayerInfo
- Publication number
- JPH0630157B2 JPH0630157B2 JP15588284A JP15588284A JPH0630157B2 JP H0630157 B2 JPH0630157 B2 JP H0630157B2 JP 15588284 A JP15588284 A JP 15588284A JP 15588284 A JP15588284 A JP 15588284A JP H0630157 B2 JPH0630157 B2 JP H0630157B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- loop
- servo
- disk
- 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
- G11B7/09—Disposition 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
- G11B7/0948—Disposition 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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
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】 産業上の利用分野 本発明は光学式のディジタルディスクプレーヤに係り、
特にディスクの傷，ごみ等による誤動作を防ぐ構成に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical digital disc player,
In particular, the present invention relates to a configuration that prevents malfunctions due to scratches, dust, etc. on the disc.
従来例の構成とその問題点 一般に、光学式のディジタルディスクプレーヤにおいて
はディスクの傷，ごみ等によりトラックジャンプやフォ
ーカス外れ等の誤動作が発生することが大きな問題点で
ある。Configuration of Conventional Example and Problems Thereof In general, in an optical digital disc player, a major problem is that a malfunction such as a track jump or defocus occurs due to a scratch or dust on the disc.
この対策として、従来、ディスクから光ピックアップで
再生された信号（ＲＦ信号）の振幅変動からディスクの
傷，ごみ等を検出し、傷，ごみによる妨害がある間、ト
ラッキングサーボ回路、フォーカスサーボ回路のループ
を遮断し、この間のトラッキング制御信号レベル，フォ
ーカス制御信号レベルは遮断直前のレベルで保持する方
法が考えられている。As a countermeasure against this, conventionally, a scratch or dust on the disc is detected from the amplitude fluctuation of a signal (RF signal) reproduced from the disc by an optical pickup, and a tracking servo circuit or a focus servo circuit is operated while there is interference due to the scratch or dust. A method is considered in which the loop is cut off and the tracking control signal level and the focus control signal level during this period are held at the levels immediately before the cutoff.
しかし、この方法では、傷，ごみによる妨害は妨害があ
ってはじめて検出できることになり、必然的に前記遮断
のタイミングが遅れることになる。この結果、傷，ごみ
による誤動作除去の効果が不充分となる。However, in this method, the interference due to scratches or dust cannot be detected until there is interference, and the timing of the interruption is inevitably delayed. As a result, the effect of removing malfunction due to scratches and dust becomes insufficient.
発明の目的 本発明は上記問題点を解決し、傷，ごみによる誤動作除
去効果を有効にするディジタルディスクプレーヤを提供
しようとするものである。An object of the present invention is to solve the above problems and to provide a digital disc player which effectively eliminates the malfunction caused by scratches and dust.
発明の構成 上記目的を達成するため、本発明のディジタルディスク
プレーヤは、データ信号を生成するデータ信号生成手段
と、データ信号からその振幅情報を抽出する手段と、振
幅情報をディスク１回転に要する時間よりわずかに短い
時間遅延させる遅延手段と、遅延手段の出力信号あるい
は入力信号のレベル変動からディスク上の傷またはごみ
の存在を検出し、傷またはごみがある間を含む所定の時
間、トラッキングサーボあるいはフォーカスサーボのサ
ーボループを遮断するループ制御信号を生成する手段
と、トラッキングサーボループ，フォーカスサーボルー
プ内にあって前記ループ制御信号により各々のループの
遮断，接続等の制御手段とを有してなり、データ信号の
振幅成分をディスク回転周期よりわずかに短い遅延手段
に入力し、この遅延手段の出力信号のレベル変動から
傷，ごみの存在を検出すると、傷，ごみの影響を受けは
じめてからディスク２回転目以降は、傷，ごみの存在に
先立って１回転前の傷，ごみを検出した検出信号を用い
てトラッキングサーボ，フォーカスサーボの各回路の動
作を制御し、傷，ごみによる誤動作がおこる前に対処で
きるものである。In order to achieve the above object, the digital disc player of the present invention comprises a data signal generating means for generating a data signal, a means for extracting the amplitude information from the data signal, and a time required for one rotation of the amplitude information for the disk. The presence of scratches or dust on the disk is detected from the level fluctuation of the output signal or the input signal of the delay means for delaying a slightly shorter time, and the tracking servo or It has means for generating a loop control signal for breaking the servo loop of the focus servo, and control means for breaking and connecting each loop in the tracking servo loop and the focus servo loop by the loop control signal. Input the amplitude component of the data signal to the delay means that is slightly shorter than the disc rotation period. When the presence of scratches and dust is detected from the level fluctuation of the output signal of the delay means, the scratches and dust are not affected, and after the second rotation of the disk, scratches and scratches one revolution before the presence of scratches and dust, The operation of each circuit of the tracking servo and focus servo is controlled by using the detection signal that detects dust, so that it can be dealt with before malfunction due to scratches or dust occurs.
実施例の説明 以下、本発明をトラッキングサーボ回路に適用した場合
を例にとり第１図を用いて説明する。Description of Embodiments An example of applying the present invention to a tracking servo circuit will be described below with reference to FIG.
第１図において、１は光ピックアップであり、１ａは光
ピックアップ１中にあって、光ピックアップ１から出る
レーザ光の、ディスクからの反射光を検出する光ディテ
クタ、１ｂは光ピックアップ１中にあって、光ピックサ
ップ１中から出るレーザ光のトラッキング制御を行うト
ラッキング用アクチュエータコイルである。In FIG. 1, reference numeral 1 is an optical pickup, 1a is an optical detector, and 1a is an optical detector for detecting a reflected light of a laser beam emitted from the optical pickup 1 from a disc. And a tracking actuator coil for performing tracking control of the laser light emitted from the optical pick-up 1.
２は光ディテクタ１中からＲＦ信号を生成するＲＦ信号
生成回路であり、このＲＦ信号から後段のデータ再生部
（図示せず）において音声信号，映像信号等のデータが
再生される。Reference numeral 2 denotes an RF signal generation circuit that generates an RF signal from the photodetector 1, and data such as an audio signal and a video signal is reproduced from this RF signal in a data reproduction section (not shown) in the subsequent stage.
３はＲＦ信号を検波してＲＦ信号振幅成分を出力する検
波回路である、４は検波回路３の出力信号をディスク１
回転に要する時間よりわずかに短い時間だけ遅延させる
遅延回路、５は遅延回路４の入力信号と出力信号の和を
得る和回路、６は和回路５の出力信号のレベル変動から
ディスクの傷ごみ等によるＲＦ信号への妨害を検出し
て、ＲＦ信号が妨害を受けている間を含む所定の時間だ
け、後述の制御回路９において、トラッキングサーボ回
路を遮断するループ制御信号を出力するループ制御信号
生成回路であり、上記ＲＦ信号生成回路２，検波回路
３，遅延回路４，和回路５，ループ制御信号生成回路６
によりサーボループ制御部１２を構成している。Reference numeral 3 is a detection circuit for detecting an RF signal and outputting an RF signal amplitude component. Reference numeral 4 is an output signal of the detection circuit 3 for the disc 1
A delay circuit for delaying the time slightly shorter than the time required for rotation, 5 is a sum circuit for obtaining the sum of the input signal and the output signal of the delay circuit 4, and 6 is a disc dust or the like due to the level fluctuation of the output signal of the sum circuit 5. Loop control signal generation for detecting a disturbance to the RF signal by the control circuit 9 and outputting a loop control signal for cutting off the tracking servo circuit in a control circuit 9 described later for a predetermined time including a period during which the RF signal is being disturbed. The RF signal generation circuit 2, the detection circuit 3, the delay circuit 4, the sum circuit 5, the loop control signal generation circuit 6
The servo loop control unit 12 is configured by.
７は光ディテクタ１ａの出力中からトラッキングエラー
信号を生成するトラッキングエラー信号生成回路、８は
トラッキングサーボループ１ｂ全体が安定に動作するよ
う位相補正を行う位相補正回路、９は位相補正回路８の
出力を入力し、前記ループ制御信号によって位相補正回
路８の出力を制御して後段の増幅器１０へ入力させる制
御回路である。増幅器１０は制御回路９の出力を増幅し
て、トラッキング用アクチュエータコイル１ｂの駆動信
号を出力する。Reference numeral 7 is a tracking error signal generation circuit that generates a tracking error signal from the output of the photodetector 1a, 8 is a phase correction circuit that performs phase correction so that the entire tracking servo loop 1b operates stably, and 9 is an output of the phase correction circuit 8. Is input to control the output of the phase correction circuit 8 according to the loop control signal and input it to the amplifier 10 at the subsequent stage. The amplifier 10 amplifies the output of the control circuit 9 and outputs a drive signal for the tracking actuator coil 1b.
以上の構成において、ＲＦ信号振幅情報を有する検波回
路３の出力、およびその遅延回路４の出力から傷，ごみ
によるＲＦ信号への妨害の有無を判定し、妨害がある間
を含む所定の間、ループ制御信号で制御回路９を制御し
て、トラッキング用アクチュエータコイル１ｂの駆動信
号を、妨害の影響が重畳する直前のレベルで保持する。
ここで、この制御がＲＦ信号に実際に傷，ごみの妨害が
あらわれる直前に開始されることから、妨害除去効果が
有効となる。In the above configuration, the presence or absence of interference with the RF signal due to scratches or dust is judged from the output of the detection circuit 3 having the RF signal amplitude information and the output of the delay circuit 4 thereof, and for a predetermined period including the time of interference, The control circuit 9 is controlled by the loop control signal to hold the drive signal of the tracking actuator coil 1b at the level immediately before the influence of interference is superposed.
Here, since this control is started immediately before the interference of scratches and dust actually appears in the RF signal, the interference removal effect is effective.
次に、ディスク回転がＣＬＶ（線速度一定）で制御され
る場合の遅延回路４の具体構成について第２図を参照し
て説明する。Next, a specific configuration of the delay circuit 4 when the disk rotation is controlled by CLV (constant linear velocity) will be described with reference to FIG.
ディスク回転がＣＬＶの場合、ディスクの内周を再生す
る場合と外周を再生する場合でディスクの自転周期が変
化する。従って、遅延回路４の遅延時間もこれに応じて
変化する必要がある。第２図において、４Ａはディスク
を回転させる回転用モータが一定角度θ（＝360／Ｍ
Ｍ：整数）回転するごとに出力されるモータ回転パルス
および後述の分周器４Ｄの出力を入力し、両者の位相差
情報を出力する位相比較器、４Ｂは位相比較器４Ａの出
力を後述の電圧制御発振器（ＶＣＯ）４Ｃの制御信号に
変換するループフィルタである。電圧制御発振器４Ｃは
ループフィルタ４Ｂの出力により出力周波数が制御され
る。分周器４Ｄは電圧制御発振器４Ｃの出力周波数
ＶＣＯをＮ１分周する。これらにより位相ロックループ
（ＰＬＬ）構成し、位相ロック時の電圧制御発振器４Ｃ
の出力周波数ＶＣＯは、ＶＣＯ ＝Ｎ１・Ｍ （ただし、Ｍ：モータ回転パルス周波数） となる。When the disk rotation is CLV, the rotation cycle of the disk changes depending on whether the inner circumference of the disk is reproduced or the outer circumference is reproduced. Therefore, the delay time of the delay circuit 4 also needs to change accordingly. In FIG. 2, 4A indicates that the rotation motor for rotating the disk has a constant angle θ (= 360 / M).
(M: integer) A phase comparator 4B which inputs a motor rotation pulse output each time it rotates and an output of a frequency divider 4D described later and outputs phase difference information between the both is output by the phase comparator 4A as described later. It is a loop filter that converts into a control signal of a voltage controlled oscillator (VCO) 4C. The output frequency of the voltage controlled oscillator 4C is controlled by the output of the loop filter 4B. The frequency divider 4D is the output frequency of the voltage controlled oscillator 4C.
Divide the VCO by N 1 . The phase-locked loop (PLL) is configured by these, and the voltage-controlled oscillator 4C at the time of phase lock
The output frequency VCO of VCO = N 1 · M (where M is the motor rotation pulse frequency).
４Ｅは前記出力周波数ＶＣＯをＮ２分周して後述の遅
延素子４Ｆのクロック信号とする分周器であり、その出
力周波数ＣＣＫは、ＣＣＫ ＝ＶＣＯ／Ｎ２ ＝（Ｎ１／Ｎ２）・Ｍ となる。4E is a frequency divider that divides the output frequency VCO by N 2 to obtain a clock signal for the delay element 4F described later, and its output frequency CCK is CCK = VCO / N 2 = (N 1 / N 2 ). It becomes M.
遅延素子４ＦはＢＢＤ等よりなり、その遅延時間ＴＤは
遅延素子段数ＮＤとクロック周期１／ＣＣＫの積、す
なわち、 ＴＤ＝ＮＤ／ＣＣＫ＝（Ｎ２／Ｎ１）・（ＮＤ）・
（１／Ｍ） となり、ディスク回転周波数の逆数、すなわち、ディス
ク回転周期に比例した遅延時間となる。The delay element 4F is composed of a BBD or the like, and its delay time T D is a product of the number of delay element stages N D and the clock cycle 1 / CCK , that is, T D = N D / CCK = (N 2 / N 1 ) · (N D ) ・
(1 / M ), which is the reciprocal of the disk rotation frequency, that is, the delay time proportional to the disk rotation cycle.
発明の効果 以上の説明から明らかなように、本発明によれば、ディ
スク上の傷，ごみ等による誤動作はその誤動作に先立っ
て行えることにより、その防止効果を充分に発揮でき
る。特に、ディジタルディスクプレーヤを車載用、ポー
タブル等に用いるときは、ディスクに傷，ごみ等がつき
やすく、本発明は特に有効である。EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, malfunctions due to scratches, dust, etc. on the disk can be performed prior to the malfunctions, so that the preventive effect thereof can be sufficiently exerted. In particular, when the digital disc player is used in a vehicle, a portable device, or the like, the disc is easily scratched or dusted, and the present invention is particularly effective.
第１図は本発明の一実施例を示すディジタルディスクプ
レーヤのトラッキングサーボ回路のブロック構成図、第
２図は同回路における遅延回路のブロック構成図であ
る。 １……光ピックアップ、２……ＲＦ信号生成回路、３…
…検波回路、４……遅延回路、５……和回路、６……ル
ープ制御信号生成回路、９……制御回路。FIG. 1 is a block configuration diagram of a tracking servo circuit of a digital disc player showing an embodiment of the present invention, and FIG. 2 is a block configuration diagram of a delay circuit in the circuit. 1 ... Optical pickup, 2 ... RF signal generation circuit, 3 ...
... detection circuit, 4 ... delay circuit, 5 ... sum circuit, 6 ... loop control signal generation circuit, 9 ... control circuit.
Claims (2)
し光ビームを照射して信号を読み出すディジタルディス
クプレーヤにおいて、データ信号を生成するデータ信号
生成手段と、前記データ信号からその振幅情報を抽出す
る手段と、前記振幅情報をディスク１回転に要する時間
よりわずかに短い時間遅延させる遅延手段と、前記遅延
手段の出力信号あるいは入力信号のレベル変動からディ
スク上の傷またはごみの存在を検出し、傷またはごみが
ある間を含む所定の時間、トラッキングサーボあるいは
フォーカスサーボのサーボループを遮断制御するループ
制御信号を生成する手段と、前記ループ制御信号により
前記サーボループを遮断されたとき、遮断される前の信
号によって前記サーボループを制御する制御手段とを有
するディジタルディスクプレーヤ。1. A digital disk player for irradiating a disk on which a digital signal is recorded with a light beam to read the signal, and a data signal generating means for generating a data signal and means for extracting amplitude information from the data signal. A delay means for delaying the amplitude information for a time period slightly shorter than the time required for one rotation of the disk; and detecting the presence of a scratch or dust on the disk from the level fluctuation of the output signal or the input signal of the delay means, A means for generating a loop control signal for controlling the servo loop of the tracking servo or the focus servo for a predetermined time including the time when there is dust, and a means before the servo control is interrupted when the servo loop is interrupted by the loop control signal. And a control means for controlling the servo loop by a signal. Disk player.
毎に出力されるモータ回転パルスに比例した出力周波数
を有する位相ロックループと、前記出力周波数を所定の
分周比で分周する分周器および分周器出力をクロック入
力とする遅延素子で構成した特許請求の範囲１項記載の
ディジタルディスクプレーヤ。2. The delay means comprises a phase lock loop having an output frequency proportional to a motor rotation pulse output each time the disc rotates by a predetermined angle, and a frequency division for dividing the output frequency by a predetermined frequency division ratio. 2. A digital disk player according to claim 1, wherein the digital disk player is composed of a delay element using the output of the frequency divider and the frequency divider as a clock input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15588284A JPH0630157B2 (en) | 1984-07-26 | 1984-07-26 | Digital Disc Player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15588284A JPH0630157B2 (en) | 1984-07-26 | 1984-07-26 | Digital Disc Player |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6134735A JPS6134735A (en) | 1986-02-19 |
| JPH0630157B2 true JPH0630157B2 (en) | 1994-04-20 |
Family
ID=15615564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15588284A Expired - Lifetime JPH0630157B2 (en) | 1984-07-26 | 1984-07-26 | Digital Disc Player |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0630157B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3614142B2 (en) | 2002-03-08 | 2005-01-26 | 船井電機株式会社 | Optical disc recording / reproducing apparatus |
-
1984
- 1984-07-26 JP JP15588284A patent/JPH0630157B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6134735A (en) | 1986-02-19 |
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