JPH0855446A - Method for controlling forwarding of optical head of optical disk device and device therefor - Google Patents

Method for controlling forwarding of optical head of optical disk device and device therefor

Info

Publication number
JPH0855446A
JPH0855446A JP18953694A JP18953694A JPH0855446A JP H0855446 A JPH0855446 A JP H0855446A JP 18953694 A JP18953694 A JP 18953694A JP 18953694 A JP18953694 A JP 18953694A JP H0855446 A JPH0855446 A JP H0855446A
Authority
JP
Japan
Prior art keywords
optical head
stepping motor
optical
optical disk
disk device
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
JP18953694A
Other languages
Japanese (ja)
Inventor
Terukazu Masuda
輝和 増田
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP18953694A priority Critical patent/JPH0855446A/en
Publication of JPH0855446A publication Critical patent/JPH0855446A/en
Pending legal-status Critical Current

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  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To embody an optical disk device capable of performing a fast and correct rough searching at a low cost by making a stepping motor moving an optical head in the radial direction of a disk brake by the number of calculated pulses. CONSTITUTION:An optical head 4 is provided by facing to an optical disk 8 and it is moveable by the drive of the stepping motor 2. Data read out with the optical head 4 are transmitted to a signal processing circuit 10 via a waveform shaping circuit 9 and prescibed data are transmitted to an interface processing part 11 and a CPU 12. The CPU 12 performs the rough searching after receiving sub-code data including absolute time from an original position detector 7 and command data from the interface processing part 11.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、光ディスク装置の光学
ヘッド送り方法及び装置に関し、特にステッピングモー
タを用いた光学ヘッド送り方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head feeding method and apparatus for an optical disk device, and more particularly to an optical head feeding method using a stepping motor.

【0002】[0002]

【従来の技術】従来、光ディスク装置がトラックサーチ
を行う場合、光ヘッドを電磁モータにより光ディスクの
半径方向に広範囲な移動を行うことで目的トラック近傍
にレンズを運ぶ粗サーチと、光学ヘッド内のアクチュエ
ータでレンズを微小な範囲で移動させ、実際に目的トラ
ック上にレンズを合わせ込む密サーチの二段のサーボル
ープを用いている。
2. Description of the Related Art Conventionally, when an optical disk apparatus carries out a track search, a coarse search is carried out by moving an optical head in a radial direction of the optical disk by an electromagnetic motor to bring a lens near a target track, and an actuator in the optical head. By using the two-stage servo loop of fine search, the lens is moved in a minute range and the lens is actually aligned on the target track.

【0003】前記粗サーチでは、アクセスタイムの短縮
化のために光学ヘッド移動のサーボ系が位置検出器や速
度検出器などのフィードバックによる閉ループ制御を用
いて光学ヘッド移動を高速かつ正確にするのが一般的で
ある。
In the rough search, the servo system for moving the optical head uses closed loop control by feedback of a position detector, a speed detector, etc. to make the optical head move quickly and accurately in order to shorten the access time. It is common.

【0004】また、位置や速度などの検出器を設けない
サーボ方式として光学ヘッド移動用モータの回転を間欠
駆動させて、モータ駆動休止中に光学ヘッド移動速度を
検出する方法(特開平3−105732号公報)がある
が、間欠駆動により光学ヘッドの移動速度が遅くなる。
あるいは不安定になりアクセスタイム短縮に支障を来す
恐れがある。この方法を図5に示す。
Further, a method of intermittently driving the rotation of the motor for moving the optical head to detect the moving speed of the optical head while the motor is stopped as a servo system in which a detector for position and speed is not provided (Japanese Patent Laid-Open No. 3-105732). However, the moving speed of the optical head becomes slower due to the intermittent drive.
Otherwise, it may become unstable and hinder access time reduction. This method is shown in FIG.

【0005】[0005]

【発明が解決しようとする課題】従来の光ディスク装置
では、粗サーチを正確かつ高速に行うための位置検出器
や速度検出器などの高価な部品を必要とするためコスト
アップにつながり、かつ小型化にも支障を来す欠点があ
る。
The conventional optical disk device requires expensive parts such as a position detector and a speed detector for performing a rough search accurately and at high speed, which leads to an increase in cost and downsizing. It also has a drawback that it causes trouble.

【0006】本発明の目的は、このような従来の問題を
解決するものであり、位置、速度検出器などを用いず、
かつ正確で安定したトラックサーチを行える光ディスク
装置の光学ヘッド送り制御方法及び装置を提供すること
である。
An object of the present invention is to solve such a conventional problem and to eliminate the need for position and speed detectors.
Another object of the present invention is to provide an optical head feed control method and device for an optical disk device, which can perform accurate and stable track search.

【0007】[0007]

【課題を解決するための手段】本発明においては、トラ
ックサーチ動作に入ると、まず光学ヘッドがディスクの
どの位置に存在するかを判別するためにディスクデータ
内の絶対時間を読み取る;この読み取った絶対時間とサ
ーチ先の絶対時間から2点間の距離に換算し、この距
離、すなわち光学ヘッドの移動量に相当するステッピン
グモータの回転数または回転角度を算出し、このモータ
へ出力すべきパルス数Aを算出する;その後、モータを
開ループ制御で駆動させると同時に出力パルス数をカウ
ントしていく;パルス数のカウントが算出した値に達し
た時点でモータ駆動を停止させる。本発明ではこのよう
にして目的トラック近傍にすばやく光学ヘッドの移動を
行うことができる。
In the present invention, when the track search operation is started, first, the absolute time in the disk data is read in order to determine the position of the disk where the optical head exists; The absolute time and the absolute time of the search destination are converted into a distance between two points, and this distance, that is, the rotation speed or rotation angle of the stepping motor corresponding to the movement amount of the optical head is calculated, and the number of pulses to be output to this motor. A is calculated; thereafter, the motor is driven by open loop control, and at the same time, the number of output pulses is counted; when the count of the number of pulses reaches the calculated value, the motor drive is stopped. In the present invention, the optical head can be quickly moved in the vicinity of the target track in this manner.

【0008】[0008]

【実施例】図1は本発明による光ディスク装置の光学ヘ
ッド送り制御方法のフローを示す図であり、粗サーチが
開始されるとステップS1でディスクデータ内の絶対時
間を読み取り、光ヘッドの現在位置を確認する。次にス
テップS2で読み取った絶対時間とサーチ目標の絶対時
間からサーチ目標までの距離を求める。ステップS3で
は前ステップで決めた距離だけ光学ヘッドが移動するた
めに必要なステッピングモータの回転数または回転角度
(A)を算出する。ステップS4ではステッピングモー
タを駆動開始し、ステップS5ではステップモータを駆
動する出力パルス数をカウントする。このとき、ステッ
プS6ではカウント値が先のAに対応する値に達したか
どうかを判断し、この値に対応した場合はステップS7
でステッピングモータを停止させる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the flow of an optical head feed control method for an optical disk apparatus according to the present invention. When a rough search is started, the absolute time in the disk data is read in step S1 and the current position of the optical head is read. To confirm. Next, the distance from the absolute time read in step S2 and the absolute time of the search target to the search target is obtained. In step S3, the rotation speed or rotation angle (A) of the stepping motor required for the optical head to move by the distance determined in the previous step is calculated. In step S4, driving of the stepping motor is started, and in step S5, the number of output pulses driving the step motor is counted. At this time, in step S6, it is determined whether or not the count value has reached the value corresponding to the previous A, and if it corresponds to this value, step S7
Stop the stepping motor with.

【0009】図2は本発明の光学ヘッド送り制御を行う
ための構成図であり、図3は光学ヘッド部分の詳細図で
ある。図2において光ディスク8に対向して光ヘッド4
が設けられており、これはステッピングモータ1の駆動
により移動することができる。光ヘッド4で読み取られ
たデータは波形整形回路9を経て信号処理回路10へ送
られ、所定のデータがインターフェース処理部11、C
PU12へ送られる。CPU12は原点位置検出器7か
らのデータ、信号処理回路10からのディスクデータ内
の絶対時間を含むサブコードデータ及びインタフェース
処理部11からのコマンドデータを受けて、前述したよ
うな粗サーチ処理を行う。更に、図3を参照して光ヘッ
ド部分を詳細に説明すると、1はステッピングモータ、
2はリードスクリュー、3はスクリュー2を押さえ込む
軸受け、4はレンズ5が設けてある光ヘッドで、ステッ
ピングモータ1が回転すると光ヘッド4はガイドレール
6に沿ってディスク半径方向に移動する。さらに、7は
光ヘッド4が原点位置であることを認識するための検出
器である。
FIG. 2 is a block diagram for carrying out the optical head feed control of the present invention, and FIG. 3 is a detailed view of the optical head portion. In FIG. 2, the optical head 4 faces the optical disk 8
Is provided and can be moved by driving the stepping motor 1. The data read by the optical head 4 is sent to the signal processing circuit 10 via the waveform shaping circuit 9, and predetermined data is transferred to the interface processing units 11 and C.
It is sent to the PU 12. The CPU 12 receives the data from the origin position detector 7, the subcode data including the absolute time in the disk data from the signal processing circuit 10 and the command data from the interface processing unit 11, and performs the rough search processing as described above. . Further, the optical head portion will be described in detail with reference to FIG. 3, 1 is a stepping motor,
Reference numeral 2 is a lead screw, 3 is a bearing that holds the screw 2, and 4 is an optical head provided with a lens 5. When the stepping motor 1 rotates, the optical head 4 moves along a guide rail 6 in the disk radial direction. Further, 7 is a detector for recognizing that the optical head 4 is at the origin position.

【0010】図4は本発明の第2の実施例を示すフロー
チャートであり、第1の実施例に比べて学習効果をもた
せたものである。まず光ヘッド4が光ディスク半径方向
上に存在する位置を確認するために、光ヘッド4から光
ディスク表面に照射したレーザー光の反射光をデコード
して得られるディスクデータ中のサブコードを読み取
り、サブコードデータ中のディスク絶対時間を読む(ス
テップS10)。次に、この値とサーチ先アドレスの絶
対時間により光ヘッド4が移動すべき距離を算出し、こ
の距離に相当するステッピングモータ1に出力すべきパ
ルス数Aを算出する(ステップS11)。
FIG. 4 is a flow chart showing a second embodiment of the present invention, which has a learning effect as compared with the first embodiment. First, in order to confirm the position where the optical head 4 exists in the radial direction of the optical disc, the subcode in the disc data obtained by decoding the reflected light of the laser light emitted from the optical head 4 to the optical disc surface is read, and the subcode is read. The disk absolute time in the data is read (step S10). Next, the distance that the optical head 4 should move is calculated from this value and the absolute time of the search destination address, and the number of pulses A to be output to the stepping motor 1 corresponding to this distance is calculated (step S11).

【0011】ステップS12では前のステップで求めた
Aに今回行おうとしているサーチ以前に行ったサーチ実
行結果誤差量B(学習値)を加算する。次にステップS
13ではステッピングモータ1の駆動を開始させるとと
もに、ステップS14で出力パルス数をカウントする。
ステップS16ではカウント値が(A+B)に達したか
どうか判断し、達したならばステップS17でステッピ
ングモータを停止させる。
In step S12, the search execution result error amount B (learning value) performed before the current search is added to A obtained in the previous step. Then step S
In step 13, the driving of the stepping motor 1 is started, and the number of output pulses is counted in step S14.
In step S16, it is determined whether or not the count value reaches (A + B), and if it reaches, the stepping motor is stopped in step S17.

【0012】本実施例においては、ステップS18で光
ヘッド4が完全に停止した後、再びディスクのサブコー
ドデータから絶対時間を読み込む。これは、ステッピン
グモータ1の駆動制御がオープンループであるために位
置決め誤差が大きくなりサーチ時間の悪化を防ぐもので
あり、出力パルス数に学習効果を持たせて誤差をできる
限り軽減する処理を行うため目的位置との誤差値から学
習値Bを算出し、ステップS19で次回の粗サーチの学
習値として保存する。その後、粗サーチを終了させる。
In this embodiment, after the optical head 4 is completely stopped in step S18, the absolute time is read again from the subcode data of the disk. This is to prevent the positioning time from becoming large and the search time from deteriorating because the drive control of the stepping motor 1 is an open loop, and a process of giving a learning effect to the number of output pulses to reduce the error as much as possible is performed. Therefore, the learning value B is calculated from the error value from the target position, and is stored as the learning value for the next rough search in step S19. Then, the rough search is ended.

【0013】[0013]

【発明の効果】本発明によれば、以上説明したように光
ヘッドをディスク半径方向に移動させるステッピングモ
ータを算出したパルス数だけで制動させることにより、
光ヘッドの可動範囲全域にわたり光ヘッドの位置、速度
などを知るための検出器が不要となり、高速でかつ正確
な粗サーチを行える光ディスク装置をローコストでコン
パクトに実現できる効果がある。
According to the present invention, as described above, the stepping motor for moving the optical head in the disk radial direction is braked only by the calculated number of pulses.
There is no need for a detector for knowing the position and speed of the optical head over the entire movable range of the optical head, and there is an effect that an optical disk device capable of high-speed and accurate rough search can be realized at low cost and compactly.

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

【図1】本発明の一実施例の制御方法を示すフローチャ
ート。
FIG. 1 is a flowchart showing a control method according to an embodiment of the present invention.

【図2】本発明の実施例の構成を示す構成図。FIG. 2 is a configuration diagram showing a configuration of an embodiment of the present invention.

【図3】図2の構成図のうち光ヘッド部分の詳細図。FIG. 3 is a detailed view of an optical head portion in the configuration diagram of FIG.

【図4】本発明の第二の実施例の制御方法を示すフロー
チャート。
FIG. 4 is a flowchart showing a control method of a second embodiment of the present invention.

【図5】従来の光ディスクに対する光ヘッドの駆動装置
を示す構成図。
FIG. 5 is a configuration diagram showing a drive device of an optical head for a conventional optical disc.

【符号の説明】[Explanation of symbols]

1 ステッピングモータ 2 リードスクリュー 3 軸受け 4 光ヘッド 5 レンズ 6 ガイドレース 7 原点検出器 8 光ディスク 9 波形整形回路 10 信号処理回路 11 インターフェース処理回路 12 CPU 1 stepping motor 2 lead screw 3 bearing 4 optical head 5 lens 6 guide race 7 origin detector 8 optical disk 9 waveform shaping circuit 10 signal processing circuit 11 interface processing circuit 12 CPU

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 光学ヘッドを光ディスクの半径方向に駆
動するステッピングモータを用いた機構を用いた光ディ
スク装置において、トラックサーチを行う際、ディスク
データ内の絶対時間を読み出し、前記光ヘッドの位置判
定をし、この位置とサーチ目標の位置との距離から前記
ステッピングモータへ供給する駆動パルス数を算出する
ことを特徴とする光ディスク装置の光学ヘッド送り制御
方法。
1. In an optical disc apparatus using a mechanism using a stepping motor for driving an optical head in a radial direction of an optical disc, when track search is performed, absolute time in disc data is read to determine the position of the optical head. The number of drive pulses supplied to the stepping motor is calculated from the distance between this position and the position of the search target.
【請求項2】 算出された駆動パルス数と前記ステッピ
ングモータの実際の駆動パルスとを比較し、実際の駆動
パルス数が算出された駆動パルス数に達したとき前記ス
テッピングモータを停止させる請求項1の光ディスク装
置の光学ヘッド送り制御方法。
2. The stepping motor is stopped when the calculated drive pulse number is compared with the actual drive pulse of the stepping motor, and when the actual drive pulse number reaches the calculated drive pulse number. Optical head feed control method for optical disk device.
【請求項3】 前記ステッピングモータの停止後、前記
光ヘッド位置を判定し、サーチ目標の位置との差を求
め、この差を次回のトラックサーチの際に算出駆動パル
ス数に加える請求項3の光ディスク装置の光学ヘッド送
り制御方法。
3. The method according to claim 3, wherein after the stepping motor is stopped, the position of the optical head is determined, a difference from the search target position is obtained, and the difference is added to the calculated drive pulse number at the next track search. Optical head feed control method for optical disk device.
【請求項4】 光学ヘッドと、前記光学ヘッドを移動さ
せるステッピングモータと光ディスクに対する光学ヘッ
ドの位置を検出する位置検出器と、光学ヘッドの移動目
標コマンドと前記位置検出器の出力とを受け、前記ステ
ッピングモータに対する駆動量を算出する算出手段と、
前記算出手段での算出結果に基づき前記ステッピングモ
ータを駆動する駆動手段を具備する光ディスク装置の光
学ヘッド送り制御装置。
4. An optical head, a stepping motor for moving the optical head, a position detector for detecting the position of the optical head with respect to the optical disk, a command for moving the optical head, and an output of the position detector, Calculation means for calculating the drive amount for the stepping motor,
An optical head feed control device for an optical disk device, comprising a driving means for driving the stepping motor based on the calculation result of the calculating means.
【請求項5】 移動目標と光学ヘッドの位置との誤差を
求める誤差検出手段を具備し、次回の移動に際し前記誤
差を補償して前記ステッピングモータを駆動する請求項
4の光ディスク装置の光学ヘッド送り制御装置。
5. An optical head feed for an optical disk apparatus according to claim 4, further comprising error detecting means for obtaining an error between a movement target and the position of the optical head, and compensating for the error in the next movement to drive the stepping motor. Control device.
JP18953694A 1994-08-11 1994-08-11 Method for controlling forwarding of optical head of optical disk device and device therefor Pending JPH0855446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18953694A JPH0855446A (en) 1994-08-11 1994-08-11 Method for controlling forwarding of optical head of optical disk device and device therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18953694A JPH0855446A (en) 1994-08-11 1994-08-11 Method for controlling forwarding of optical head of optical disk device and device therefor

Publications (1)

Publication Number Publication Date
JPH0855446A true JPH0855446A (en) 1996-02-27

Family

ID=16242955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18953694A Pending JPH0855446A (en) 1994-08-11 1994-08-11 Method for controlling forwarding of optical head of optical disk device and device therefor

Country Status (1)

Country Link
JP (1) JPH0855446A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7110329B2 (en) 2001-02-27 2006-09-19 Matsushita Electric Industrial Co., Ltd. Device and method for compensating feed control amount
JP2007257838A (en) * 1998-07-03 2007-10-04 Deutsche Thomson Brandt Gmbh Fact and precise positioning of read and/or write head in data player and/or recorder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6346512A (en) * 1986-08-13 1988-02-27 Fanuc Ltd Production of nc data
JPH0312877A (en) * 1989-06-09 1991-01-21 Fujitsu Ltd System for removing vibration of head carriage
JPH03171483A (en) * 1989-11-30 1991-07-24 Matsushita Graphic Commun Syst Inc Disk accessing method
JPH0553036A (en) * 1991-08-27 1993-03-05 Minolta Camera Co Ltd Positioning and fixing device for image read sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6346512A (en) * 1986-08-13 1988-02-27 Fanuc Ltd Production of nc data
JPH0312877A (en) * 1989-06-09 1991-01-21 Fujitsu Ltd System for removing vibration of head carriage
JPH03171483A (en) * 1989-11-30 1991-07-24 Matsushita Graphic Commun Syst Inc Disk accessing method
JPH0553036A (en) * 1991-08-27 1993-03-05 Minolta Camera Co Ltd Positioning and fixing device for image read sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007257838A (en) * 1998-07-03 2007-10-04 Deutsche Thomson Brandt Gmbh Fact and precise positioning of read and/or write head in data player and/or recorder
US7110329B2 (en) 2001-02-27 2006-09-19 Matsushita Electric Industrial Co., Ltd. Device and method for compensating feed control amount

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