JPH0234089B2 - MOKUHYOTORATSUKUICHIKENSAKUSOCHI - Google Patents
MOKUHYOTORATSUKUICHIKENSAKUSOCHIInfo
- Publication number
- JPH0234089B2 JPH0234089B2 JP5256583A JP5256583A JPH0234089B2 JP H0234089 B2 JPH0234089 B2 JP H0234089B2 JP 5256583 A JP5256583 A JP 5256583A JP 5256583 A JP5256583 A JP 5256583A JP H0234089 B2 JPH0234089 B2 JP H0234089B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- address
- moving
- reproducing
- 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
- 238000001514 detection method Methods 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、ビデオデイスクプレーヤ等におい
て、回転デイスク上の目標トラツク位置を検索す
るための高速検索装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a high-speed retrieval device for retrieving a target track position on a rotating disc in a video disc player or the like.
映像または音声信号を記録媒体上に高密度に記
録し、前記記録された信号の跡（トラツクとも言
う）から信号を再生する装置として、たとえば光
学式ビデオデイスクプレーヤの如き再生装置があ
る。この装置は光源から発生される光ビームを円
盤記録担体（デイスクとも言う）上に収束させ、
デイスク上に同心円状あるいはら線状に記録され
たトラツク上に前記光ビームが位置するように制
御し、前記光ビームの記録担体上から反射される
反射光を光検出器により検出し、信号を読みとる
ものである。
2. Description of the Related Art There is a playback device such as an optical video disc player, which records video or audio signals at high density on a recording medium and plays back the signals from the tracks of the recorded signals. This device focuses a light beam generated from a light source onto a disk record carrier (also called a disk).
The light beam is controlled so as to be positioned on a track recorded concentrically or spirally on the disk, and a photodetector detects the reflected light of the light beam from the record carrier to generate a signal. It is something to be read.
第１図は、かかるビデオデイスクプレーヤにお
ける従来の目標トラツク位置検索装置を示すブロ
ツク図である。同図において、１はデイスク、２
は回転用モータ、３はレーザダイオード、４は結
合レンズ、５は回折格子、６は偏光プリズム、７
はミラー、８は1/4波長板、９は対物レンズ、１
０は円筒レンズ、１１はミラー、１２は光検出
器、１３は差動増幅器、１４は位相補償回路、１
５はループスイツチ、１６は駆動回路、１７は駆
動コイル、１８は位相補償回路、１９はスイツ
チ、２０は駆動回路、２１は送りモータ、２２は
一致検出回路、２３はデジタル・アナログ変換
器、２４はマイクロコンピユータ、２５は信号処
理回路、２６は同期分離回路、２７は番地識別回
路、２８は高速検索制御回路である。 FIG. 1 is a block diagram showing a conventional target track position retrieval device for such a video disc player. In the figure, 1 is a disk, 2
is a rotation motor, 3 is a laser diode, 4 is a coupling lens, 5 is a diffraction grating, 6 is a polarizing prism, 7
is a mirror, 8 is a quarter-wave plate, 9 is an objective lens, 1
0 is a cylindrical lens, 11 is a mirror, 12 is a photodetector, 13 is a differential amplifier, 14 is a phase compensation circuit, 1
5 is a loop switch, 16 is a drive circuit, 17 is a drive coil, 18 is a phase compensation circuit, 19 is a switch, 20 is a drive circuit, 21 is a feed motor, 22 is a coincidence detection circuit, 23 is a digital-to-analog converter, 24 2 is a microcomputer, 25 is a signal processing circuit, 26 is a synchronization separation circuit, 27 is an address identification circuit, and 28 is a high-speed search control circuit.
次に回路動作を説明する。 Next, the circuit operation will be explained.
第１図において、デイスク１はデイスク回転用
モータ２によつてたとえば1800rpmと高速回転さ
れている。レーザダイオード３から発生される光
ビームは結合レンズ４、回折格子５に入射する。
回折格子５は透明な板の表面に細い平行線を多数
刻んだ光学素子であり、光の回折干渉作用によ
り、互いに微少な角度をなして出射する３本の光
束に分離される。３本のうち、中央の光束は記録
情報の読み出しおよび焦点位置制御用、両側の２
本はトラツキング誤差信号の検出用である。この
３本の光束は偏光プリズム６、ミラー７、1/4波
長板８を通過して対物レンズ９に入射される。対
物レンズ９は、３本の光束がデイスク１上のピツ
ト面上でトラツクに沿つてたがいに20μｍ離れた
直径約1.6μｍの三つの光スポツトとなる様に、周
知の焦点制御（フオーカス制御）によつて制御さ
れる。デイスク１上で反射された反射光は、再び
対物レンズ９、1/4波長板８を通過して偏光プリ
ズム６によつて方向が変えられ、円筒レンズ１０
を通過して光検出器１２における３個の受光面
P1，P2，P3上にそれぞれ結像する。両側の受光
面P1，P2にはトラツキング誤差信号検出用の２
本の光束が、中央の受光面P3には記録情報読み
取り用の中央の光束が結像する。中央の受光面
P3は４分割されており、その受光出力はフオー
カス誤差信号検出用にも供されている。 In FIG. 1, a disk 1 is rotated at a high speed of, for example, 1800 rpm by a disk rotation motor 2. As shown in FIG. A light beam generated from the laser diode 3 enters a coupling lens 4 and a diffraction grating 5.
The diffraction grating 5 is an optical element in which a large number of thin parallel lines are carved on the surface of a transparent plate, and due to the diffraction interference effect of light, it is separated into three beams of light that are emitted at slight angles to each other. Of the three, the central beam is used for reading recorded information and controlling the focal position, and the two on both sides
The book is for tracking error signal detection. These three beams pass through a polarizing prism 6, a mirror 7, and a quarter-wave plate 8, and are incident on an objective lens 9. The objective lens 9 performs well-known focus control so that the three light beams form three light spots with a diameter of about 1.6 μm spaced apart by 20 μm along the track on the pit surface of the disk 1. controlled. The light reflected on the disk 1 passes through the objective lens 9 and the 1/4 wavelength plate 8 again, and its direction is changed by the polarizing prism 6, and then the cylindrical lens 10.
through the three light-receiving surfaces of the photodetector 12.
Images are formed on P 1 , P 2 , and P 3 respectively. Two photosensitive surfaces P 1 and P 2 on both sides are used to detect tracking error signals.
The light beam from the book forms an image on the central light-receiving surface P3 for reading recorded information. Central light receiving surface
P3 is divided into four parts, and its light receiving output is also used for focus error signal detection.
差動増幅器１３の出力側には、光検出器１２に
おける受光面P1，P2の差信号が得られ、この差
信号は位相補償回路１４、ループスイツチ１５を
介して駆動回路１６に入力される。その駆動回路
１６の出力によりトラツキング素子駆動コイル１
７が駆動される。一方光検出器１２における受光
面P3の出力は、ビデオ信号処理回路２５に入力
され、ここでビデオ信号に変換され再生される。
このビデオ再生信号の波形を見ると、例えばその
垂直帰線期間内に当該再生信号の記録されていた
トラツクに応じた番地信号が含まれており、この
番地信号は、同期分離回路２６、番地信号識別回
路２７によつて読み出され、マイクロコンピユー
タ（以下、マイコンとも言う）２４に入力され
る。 A difference signal between the light receiving surfaces P 1 and P 2 of the photodetector 12 is obtained on the output side of the differential amplifier 13, and this difference signal is input to the drive circuit 16 via the phase compensation circuit 14 and the loop switch 15. Ru. The tracking element drive coil 1 is controlled by the output of the drive circuit 16.
7 is driven. On the other hand, the output of the light receiving surface P3 of the photodetector 12 is input to the video signal processing circuit 25, where it is converted into a video signal and reproduced.
Looking at the waveform of this video playback signal, for example, an address signal corresponding to the track on which the playback signal was recorded during the vertical retrace period is included, and this address signal is transmitted to the synchronization separation circuit 26, the address signal It is read out by the identification circuit 27 and inputted to the microcomputer (hereinafter also referred to as microcomputer) 24 .
この従来のデイスクプレーヤにおいて、デイス
ク上の所望のトラツク位置（番地）の高速検索を
行なう場合には、ここには図示していないが操作
卓によつてその所望の番地が指定され、スタート
命令が出されると、マイコン２４にて、前記指定
番地と番地識別回路２７の出力である現在のトラ
ツク番地との差が計算され一致検出回路２２にそ
の差がプリセツトされる。一致検出回路２２は具
体的にはダウンカウンタで構成されており、その
出力はデジタルアナログ変換器（以下Ｄ／Ａと略
記する）２３にてアナログ電圧に変えられる。こ
のときスイツチ１９はＤ／Ａ２３側に切換えてお
き、駆動回路２０を介して送りモータ２１を駆動
し、対物レンズ９、1/4波長板８、ミラー７等の
光学系を搭載した光学系移送台を移動させる。光
学系移送台がデイスク１上のトラツクを横切る方
向に高速で移動している間、ハープスイツチ１５
は開としておく。差動増幅器１３の出力には、光
学系移送台が移動している間、対物レンズ９から
の光束がそれまでに横切つたトラツク数に応じた
サイクル数の正弦波状の波形が得られ、この信号
を波形整形して得られるパルス（すなわち横切つ
たトラツクの数に対応した数のパルス）がクロツ
クパルスとして一致検出回路２２にダウンモード
で入力される。一致検出回路２２の出力はＤ／Ａ
２３に入力されており送りモータ２１はＤ／Ａ２
３の出力電圧によつて速度制御されながらデイス
ク上の目的のトラツク番地まで光学系移動台を移
動させる。 In this conventional disc player, when performing a high-speed search for a desired track position (address) on the disc, the desired address is specified by an operation console (not shown) and a start command is issued. When the track address is output, the microcomputer 24 calculates the difference between the specified address and the current track address output from the address identification circuit 27, and presets the difference in the match detection circuit 22. The coincidence detection circuit 22 is specifically composed of a down counter, the output of which is converted into an analog voltage by a digital-to-analog converter (hereinafter abbreviated as D/A) 23. At this time, the switch 19 is switched to the D/A 23 side, and the feed motor 21 is driven via the drive circuit 20 to transport the optical system equipped with the objective lens 9, quarter-wave plate 8, mirror 7, etc. Move the table. While the optical system transfer table is moving at high speed in the direction across the track on the disk 1, the harp switch 15
Leave it open. The output of the differential amplifier 13 is a sinusoidal waveform whose number of cycles corresponds to the number of tracks that the light beam from the objective lens 9 has traversed so far while the optical system transfer table is moving. Pulses obtained by shaping the signal (that is, a number of pulses corresponding to the number of tracks traversed) are input as clock pulses to the coincidence detection circuit 22 in down mode. The output of the coincidence detection circuit 22 is D/A
23 and the feed motor 21 is D/A2.
The optical system moving table is moved to the target track address on the disk while the speed is controlled by the output voltage No. 3.
ところで、光学系移送台が高速で移動中に外部
振動等で光学系の焦点制御回路（以下フオーカス
制御と略記する）の動作が不安定となり、フオー
カス制御がはずれた場合には、トラツキング誤差
信号も得られず、一致検出回路２２にはクロツク
パルスが入力されないため、減算動作は停止し、
したがつてＤ／Ａ２３の出力には一定電圧が出力
される。光学系移送台はこのＤ／Ａ２３の出力電
圧で制御されているから光学系移送台は一定速度
で高速移動し、目的の番地を検索できなくなると
いう問題が生ずる。 By the way, if the operation of the focus control circuit (hereinafter abbreviated as focus control) of the optical system becomes unstable due to external vibration while the optical system transfer table is moving at high speed, and the focus control is lost, the tracking error signal will also be generated. Since no clock pulse is input to the coincidence detection circuit 22, the subtraction operation is stopped.
Therefore, a constant voltage is output from the D/A 23. Since the optical system transfer table is controlled by the output voltage of the D/A 23, the optical system transfer table moves at a constant speed and a problem arises in that the target address cannot be searched.
本発明の目的は、上記した従来技術の問題点を
解決し、光学系移送台が高速で移動中にフオーカ
ス制御がはずれても、短時間に目的の番地が検索
できる様にした目標トラツク位置検索装置を提供
することにある。
The object of the present invention is to solve the problems of the prior art described above, and to provide a target track position search that enables the target address to be searched in a short time even if the focus control is lost while the optical system transfer table is moving at high speed. The goal is to provide equipment.
そこで本発明においては、フオーカスロツク信
号からフオーカス制御のはずれを検出し、フオー
カス制御がはずれた場合には、Ｄ／Ａ２３の出力
電圧を零電圧にして光学系移送台を停止させ、再
度番地識別信号を読み直して検索を行なう方法を
採用した。
Therefore, in the present invention, the loss of focus control is detected from the focus lock signal, and when the focus control is lost, the output voltage of the D/A 23 is set to zero voltage, the optical system transfer table is stopped, and the address identification signal is sent again. We adopted the method of rereading and searching.
以下本発明の実施例を添付図面を用いて説明す
る。第２図は本発明の一実施例を示すブロツク図
で、第１図におけるのと同一機能の部分について
は同一符号をつけてある。第１図の従来例におい
ては説明を省略したが、第２図に示す様に光検出
器１２の出力P3はビデオ信号処理回路２５の他
に、差動増幅器２９にも入力されている。差動増
幅器２９、位相補償回路３０、フオーカスロツク
検出回路３５、駆動回路３２、レンズアツプ制御
回路３４、フオーカス素子駆動コイル３３でフオ
ーカス制御回路を構成し、再生中のデイスク１の
面振れに対してデイスク１面上の光スポツト径が
常に1.6μｍとなる様に対物レンズ９を制御する。
レンズアツプ制御回路３４はプレーヤを再生モー
ドにしたときに、対物レンズ９を焦点位置まで上
昇させるための制御回路で、対物レンズ９の上昇
につれて差動増幅器２９に出力される信号のレベ
ルから、フオーカスロツク検出回路３５で対物レ
ンズ９が焦点位置に達したことを検出し、焦点位
置に達したならばスイツチ３１をONにし、レン
ズアツプ制御回路３４をOFFにして、フオーカ
ス制御ループをONにする。フオーカス制御回路
がONになり制御が正常に動作している場合に
は、フオーカスロツク検出回路３５からはフオー
カスロツク信号が出力される。以後は、差動増幅
器２９に得られる誤差信号が小さくなる様に位相
補償回路３０、駆動回路３２、フオーカス素子駆
動コイル３３が動作する。
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a block diagram showing an embodiment of the present invention, in which parts having the same functions as those in FIG. 1 are given the same reference numerals. Although the explanation is omitted in the conventional example shown in FIG. 1, as shown in FIG. 2, the output P 3 of the photodetector 12 is input to a differential amplifier 29 in addition to the video signal processing circuit 25. A focus control circuit is composed of a differential amplifier 29, a phase compensation circuit 30, a focus lock detection circuit 35, a drive circuit 32, a lens up control circuit 34, and a focus element drive coil 33. The objective lens 9 is controlled so that the diameter of the light spot on the surface is always 1.6 μm.
The lens up control circuit 34 is a control circuit for raising the objective lens 9 to the focal position when the player is set to playback mode, and detects focus lock from the level of the signal output to the differential amplifier 29 as the objective lens 9 rises. The circuit 35 detects that the objective lens 9 has reached the focal position, and when the focal position is reached, the switch 31 is turned on, the lens up control circuit 34 is turned off, and the focus control loop is turned on. When the focus control circuit is turned on and the control is operating normally, the focus lock detection circuit 35 outputs a focus lock signal. Thereafter, the phase compensation circuit 30, drive circuit 32, and focus element drive coil 33 operate so that the error signal obtained by the differential amplifier 29 becomes small.
検索制御回路２８は例えば第３図の様な構成と
なつている。検索モードのときにはレジスタ３６
に現在再生しているトラツク番地と目標番地との
差分がマイコン２４からプリセツトされる。高速
検索制御信号がマイコン２４によつてONにされ
るとUP／DOWNカウンタ３９にはまずレジスタ
３６のDATAが設定され、第４図ａに示す様な
トラツキング誤差信号が波形整形回路３７、
AND回路３８を介してクロツクパルスとして
UP／DOWNカウンタ３９にDOWNモードで入
力される。UP／DOWNカウンタ３９の各段の出
力はリードオンリーメモリ４１のアドレス信号と
して利用され、アドレスデコード回路４０を介し
てリードオンリーメモリ４１に入力される。リー
ドオンリーメモリ４１の出力はＤ／Ａ変換回路２
３を介して、Ｄ／Ａ変換されて、光学系移送台の
速度制御電圧となる。 The search control circuit 28 has a configuration as shown in FIG. 3, for example. When in search mode, register 36
The microcomputer 24 presets the difference between the track address currently being reproduced and the target address. When the high-speed search control signal is turned on by the microcomputer 24, the DATA of the register 36 is first set in the UP/DOWN counter 39, and a tracking error signal as shown in FIG. 4a is sent to the waveform shaping circuit 37.
As a clock pulse via AND circuit 38
The DOWN mode is input to the UP/DOWN counter 39. The output of each stage of the UP/DOWN counter 39 is used as an address signal for the read-only memory 41 and is input to the read-only memory 41 via the address decoding circuit 40. The output of the read-only memory 41 is the D/A conversion circuit 2.
3, it is D/A converted and becomes a speed control voltage for the optical system transfer table.
フオーカスロツク検出回路３５から出力される
フオーカスロツク信号は、第３図に示す様に、高
速検索制御回路２８のたとえばアドレスデコード
回路４０に入力されている。フオーカス制御がロ
ツクしている状態では、アドレスデコード回路４
０はUP／DOWNカウンタ３９の出力に応じて、
リードオンリーメモリ４１のアドレスを順次切換
える様に動作し、この動作はUP／DOWNカウン
タ３９が減算されてBorrowが発生するまで行な
われる。このときの光学系移送台の連り速度はリ
ードオンリーメモリ４１に記憶されたパターンに
よつて制御され、たとえば第４図ｂの様に目標位
置に近ずくにつれて、しだいに減少する様な関数
に設定してある。 The focus lock signal output from the focus lock detection circuit 35 is input to, for example, an address decoding circuit 40 of the high speed search control circuit 28, as shown in FIG. When the focus control is locked, the address decode circuit 4
0 according to the output of the UP/DOWN counter 39,
It operates to sequentially switch the addresses of the read-only memory 41, and this operation continues until the UP/DOWN counter 39 is decremented and Borrow occurs. The speed of the optical system transfer table at this time is controlled by a pattern stored in the read-only memory 41, and is a function that gradually decreases as it approaches the target position, as shown in FIG. 4b, for example. It has been set.
しかし、高速検索の途中でフオーカス制御のロ
ツクがはずれた場合には、第４図ｃの様にＤ／Ａ
変換器２３の出力が零電圧となる様に、リードオ
ンリーメモリ４１のアドレスをアドレスデコード
回路４０を介して切換える。光学系移送台はリー
ドオンリーメモリ４１の出力をＤ／Ａ変換した電
圧で速度制御する様にされているから、フオーカ
スロツクがはずれた時点で光学系移送台は移動を
停止させられる。その後マイコン２４は再度フオ
ーカス制御をONにしてフオーカス制御を動作さ
せたあと現在の再生番地を読み直して目標位置と
の差分をプリセツトしなおして高速検索を行な
う。 However, if the focus control loses lock during high-speed search, the D/A
The address of the read-only memory 41 is switched via the address decoding circuit 40 so that the output of the converter 23 becomes zero voltage. Since the speed of the optical system transfer table is controlled by the voltage obtained by D/A converting the output of the read-only memory 41, the movement of the optical system transfer table is stopped when the focus lock is released. Thereafter, the microcomputer 24 turns on the focus control again, operates the focus control, rereads the current reproduction address, re-presets the difference from the target position, and performs a high-speed search.
以上説明した様に、本発明によれば、目標トラ
ツク位置検索装置において、フオーカスロツク信
号でメモリのアドレス信号を切換える様にする簡
単な構成で、高速検索時にフオーカス制御がはず
れて光学系移送台が暴走することを防ぐことがで
き、短時間で目的の番地を検出することができ
る。
As explained above, according to the present invention, the target track position search device has a simple configuration in which the memory address signal is switched by the focus lock signal, and the focus control is lost during high-speed search, causing the optical system transfer stage to run out of control. The target address can be detected in a short time.
第１図は従来の目標トラツク位置検索装置を示
すブロツク図、第２図は本発明の一実施例を示す
ブロツク図、第３図は第２図における検索制御回
路２８の詳細ブロツク図、第４図は第２図の回路
において高速検索時の各部動作波形を示す波形
図、である。
符号説明、１……デイスク、２……回転用モー
タ、３……レーザダイオード、６……偏光プリズ
ム、９……収束レンズ、１２……光検出器、１
３，２９……差動増幅器、２１……送りモータ、
２２……一致検出回路、２３……Ｄ／Ａ変換器、
２４……マイクロコンピユータ、２６……同期分
離回路、２７……番地識別回路、３４……レンズ
アツプ制御回路、３５……フオーカスロツク検
出、３６……レジスタ回路、３９……UP／
DOWNカウンタ、４０……アドレスデコード回
路、４１……リードオンリーメモリ。
FIG. 1 is a block diagram showing a conventional target track position search device, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a detailed block diagram of the search control circuit 28 in FIG. 2, and FIG. This figure is a waveform diagram showing the operation waveforms of each part during high-speed search in the circuit of FIG. 2. Description of symbols, 1...Disk, 2...Rotation motor, 3...Laser diode, 6...Polarizing prism, 9...Converging lens, 12...Photodetector, 1
3, 29...differential amplifier, 21...feed motor,
22... Coincidence detection circuit, 23... D/A converter,
24...Microcomputer, 26...Synchronization separation circuit, 27...Address identification circuit, 34...Lens up control circuit, 35...Focus lock detection, 36...Register circuit, 39...UP/
DOWN counter, 40... Address decoding circuit, 41... Read only memory.
Claims (1)
ら信号を再生する信号再生手段と、該再生手段を
回転デイスク上の情報トラツクを横切る方向に移
動させる移動手段と、移動している前記再生手段
の再生出力から該再生手段が情報トラツクを横切
る回数を検出して計数する手段と、目標トラツク
位置を表わす所与の目標位置信号と該計数手段に
よる計数値とを比較し両者が一致したとき前記移
動手段による再生手段の移動を停止させる手段と
から成る回転デイスク上の目標トラツク位置検索
装置において、前記信号再生手段のフオーカス制
御が機能しなくなつたとき、そのことを検出する
手段と、該検出出力により、前記移動手段による
再生手段の移動を一旦停止させた後、検索動作を
再開させる手段とを備えたことを特徴とする目標
トラツク位置検索装置。1. A signal reproducing means for reproducing a signal from an information track recorded on a rotating disk, a moving means for moving the reproducing means in a direction across the information track on the rotating disk, and a reproduction output of the moving reproducing means. means for detecting and counting the number of times the reproducing means traverses the information track, and comparing a given target position signal representing the target track position with the counted value by the counting means, and when the two match, the moving means A target track position retrieval device on a rotary disk comprising means for stopping the movement of the reproducing means, means for detecting when the focus control of the signal reproducing means ceases to function, and a means for detecting this by the detection output, A target track position retrieval device characterized by comprising means for restarting the retrieval operation after once stopping the movement of the reproducing means by the moving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5256583A JPH0234089B2 (en) | 1983-03-30 | 1983-03-30 | MOKUHYOTORATSUKUICHIKENSAKUSOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5256583A JPH0234089B2 (en) | 1983-03-30 | 1983-03-30 | MOKUHYOTORATSUKUICHIKENSAKUSOCHI |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35292891A Division JPH0715759B2 (en) | 1991-12-17 | 1991-12-17 | Target track position search device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59178654A JPS59178654A (en) | 1984-10-09 |
| JPH0234089B2 true JPH0234089B2 (en) | 1990-08-01 |
Family
ID=12918319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5256583A Expired - Lifetime JPH0234089B2 (en) | 1983-03-30 | 1983-03-30 | MOKUHYOTORATSUKUICHIKENSAKUSOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0234089B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007257719A (en) * | 2006-03-22 | 2007-10-04 | Teac Corp | Optical disk device |
| JP2007257722A (en) * | 2006-03-22 | 2007-10-04 | Teac Corp | Optical disk device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63113939A (en) * | 1986-10-31 | 1988-05-18 | Pioneer Electronic Corp | Address retrieval system |
| JP2842476B2 (en) * | 1988-02-18 | 1999-01-06 | 富士通テン 株式会社 | Optical disc playback device |
| US5319623A (en) * | 1989-06-19 | 1994-06-07 | Matsushita Electric Industrial Co., Ltd. | Data-track search apparatus for locating a desired data track on a record carrier |
| US20090190449A1 (en) * | 2006-05-30 | 2009-07-30 | Yamada Shin-Ichi | Optical head transfer device, integrated circuit for optical head transfer device, focusing lens driving device, and integrated circuit for focusing lens driving device |
-
1983
- 1983-03-30 JP JP5256583A patent/JPH0234089B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007257719A (en) * | 2006-03-22 | 2007-10-04 | Teac Corp | Optical disk device |
| JP2007257722A (en) * | 2006-03-22 | 2007-10-04 | Teac Corp | Optical disk device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59178654A (en) | 1984-10-09 |
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