JPS5963035A - Optical tracking system - Google Patents

Optical tracking system

Info

Publication number
JPS5963035A
JPS5963035A JP13582683A JP13582683A JPS5963035A JP S5963035 A JPS5963035 A JP S5963035A JP 13582683 A JP13582683 A JP 13582683A JP 13582683 A JP13582683 A JP 13582683A JP S5963035 A JPS5963035 A JP S5963035A
Authority
JP
Japan
Prior art keywords
disk
signals
laser beam
track
optical deflector
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
JP13582683A
Other languages
Japanese (ja)
Inventor
Seiji Yonezawa
米沢 成二
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13582683A priority Critical patent/JPS5963035A/en
Publication of JPS5963035A publication Critical patent/JPS5963035A/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
    • G11B7/0946Disposition 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 operation during external perturbations not related to the carrier or servo beam, e.g. vibration

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To reproduce desired information in good order while tracking said information even if a rotary disk is vibrated due to disturbance by polarizing a laser beam condensed to a disk in the direction crossing a track, and polarizing the laser beam by a detecting signal relating to a tracking state containing in an output of a detecting signal of reflected light from the disk. CONSTITUTION:An optical deflector 10 deflects a microspot 9 toward the outside of a disk 1, namely, + side, and two signals 31, 32 appear in a photodetector 14. A pulse counter 13 gives a command of the optical deflector 10 so that the very small spot 9 is deflected toward the inside of the disk 1. Five signals 33-37 appear in the photodetector 14, and the third signal from the beginning among them, namely, 35 is sampled and inputted to a demodulator 15. When the counter 13 receives five pulses, it gives a command to the optical deflector 10 so that the microspot 9 is deflected to the outside of the disk 1. By repeating in this way, signals 30, 35, 40, 45 and 50 can be fetched from a specified track, for instance, 4.

Description

【発明の詳細な説明】 不発明は、空間的に分布した情報を電気信号に変換する
方式に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The invention relates to a method for converting spatially distributed information into electrical signals.

従来、光学的に高密度に情報を記録し、順序よく再生す
ることは困難であった。例えば、有声映画の光学録音は
トラック数が一つであるから、トラック混信なしに再生
できたのである。しかし、例えば高密度音盤(レコード
盤)で光を便って無接触に電気信号に変換再生しようと
するとき、回転音盤の偏心、モーター振動等によって、
所定の溝に沿ってトラッキングすることはできない。光
学的に回転ディスクから信号再生するときの難点は、上
記のように、再生時に振動、偏心等の外乱によって特定
の溝に沿ってトラッキングできないからである。
Conventionally, it has been difficult to optically record information with high density and reproduce it in an orderly manner. For example, optical recordings of voiced movies have only one track, so they can be played back without track interference. However, for example, when trying to play a high-density disc (record) by converting light into an electrical signal without contact, the eccentricity of the rotating disc, motor vibration, etc.
Tracking along a predetermined groove is not possible. As mentioned above, the difficulty in optically reproducing signals from a rotating disk is that tracking along a specific groove is not possible due to disturbances such as vibration and eccentricity during reproduction.

本発明の目的は、高密度に空間的に記録された情報を順
序よく再生せしめる方式を提供することである。
An object of the present invention is to provide a method for reproducing information spatially recorded with high density in an orderly manner.

以下、本発明の実施例につき、図面を参照して詳述する
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

第1図は、本発明の基礎に用いられた、変調情報を含む
回転ディスクを光学的にトラッキングし、電気信号変換
するための構成図である。
FIG. 1 is a block diagram for optically tracking a rotating disk containing modulation information and converting electrical signals, which is used as the basis of the present invention.

第1図で、1は回転ディスク、2,3,4,5゜6は変
調信号を含むトラックであシ、変調信号は凹凸あるいは
濃淡で変調されている。7は再生時に用いる光線、8は
光線7を微少に集光するための光学系、9は微少に集光
された光スポットである。10は光スポット9を回転デ
ィスクの回転力11は回転ディスク1の一部分9より反
射してくる光12をとるだめのビームスビリツタ−11
3はパルスカウンター、14は光検知器、15は復調器
である。16は光源、例えばレーザである。
In FIG. 1, 1 is a rotating disk, 2, 3, 4, 5.6 are tracks containing modulation signals, and the modulation signals are modulated by unevenness or shading. 7 is a light beam used during reproduction; 8 is an optical system for condensing the light beam 7; and 9 is a finely condensed light spot. Reference numeral 10 denotes a beam stabilizer 11 for controlling the light spot 9 and the rotational force 11 of the rotating disk to capture the light 12 reflected from the part 9 of the rotating disk 1.
3 is a pulse counter, 14 is a photodetector, and 15 is a demodulator. 16 is a light source, for example a laser.

17はテレビである。17 is a television.

以下第1図の構成図のエレメントを添附の図面により詳
述する。
The elements of the configuration diagram in FIG. 1 will be explained in detail below with reference to the accompanying drawings.

第2(a)から第2(b)図は変調信号を含む溝の形状
を示す。第2(a)図では1は回転ディスク、2,3゜
4.5.6は変調信号を含むトラックである。
Figures 2(a) to 2(b) show the shape of the groove containing the modulation signal. In FIG. 2(a), 1 is a rotating disk, and 2, 3, 4, 5, 6 are tracks containing modulation signals.

21.22.23は変調信号のエレメントである。21, 22, and 23 are elements of the modulation signal.

変調のやシかたは回転方向にそって溝巾が第2の)に示
すように、深さあるいは濃淡で変調でれている。
The width of the modulation is modulated along the direction of rotation in terms of depth or shading, as shown in (2).

第3(a)から第3(b)図は本発明によ 変調信号を
含む溝のもう1つの形状を示す。第1、a)図で、■は
回転ディスク、2,3,4,5.6は変調信号を含むト
ラックである。21.22は変調信号のエレメントであ
る。変調は回転方向とほぼ直角方向に沿って溝巾が第3
(b)図に示すように深さ、あるいは濃淡で変調されて
いる。
Figures 3(a) to 3(b) show another shape of the groove containing the modulated signal according to the invention. In Fig. 1, a), ■ is a rotating disk, and 2, 3, 4, 5.6 are tracks containing modulation signals. 21 and 22 are elements of the modulation signal. The modulation has a third groove width along the direction almost perpendicular to the direction of rotation.
(b) As shown in the figure, the depth or density is modulated.

本発明による光学的トラッキングの原理を第1図、第4
図、第5図によって詳述する。
The principle of optical tracking according to the present invention is illustrated in FIGS. 1 and 4.
This will be explained in detail with reference to FIG.

第1図において、入射光ビーム7は偏向器10、ハーフ
ミラ−11、レンズ8を通って回転ディスクの一点に微
小なスポット9を形成する。ビームスポット9は溝2,
3,4,5.6の間を高速で振動しているようになって
いる。溝3,4.5の間を振動させてもぎしつかえない
。ビームスポット9からの反射光12はレンズ8、ノ飄
−フミラー11を通って光検知器14に入る。光検知器
14で受けた信号・はパルスカウンター13でコントロ
ールされながら復調器15を通って電気信号に変換され
る。ディスク1が回転し、偏向器10で微少スポット9
を振動させた場合の微少スポットの動きを示したのが第
4図である。
In FIG. 1, an incident light beam 7 passes through a deflector 10, a half mirror 11, and a lens 8 to form a minute spot 9 at one point on a rotating disk. Beam spot 9 is groove 2,
It appears to be oscillating between 3, 4, and 5.6 at high speed. Even if the grooves 3, 4.5 are vibrated, no tightness will occur. Reflected light 12 from beam spot 9 passes through lens 8 and nose mirror 11 and enters photodetector 14 . The signal received by the photodetector 14 is converted into an electrical signal through a demodulator 15 while being controlled by a pulse counter 13. The disk 1 rotates, and a minute spot 9 is formed by the deflector 10.
FIG. 4 shows the movement of a minute spot when the is vibrated.

第4図において、2,3,4,5.6は第2図。In Fig. 4, 2, 3, 4, 5.6 are Fig. 2.

3図に示すような変調信号が記録されているトラックで
ある。微少スポットを、例えばトラック4を中心にして
、トラック5,6およびトラック3゜2をまたかるよう
に振動させると、ディスクの回転につれて、微少スポッ
トは各トラックを横切るとき、その交点30,31,3
2,33,34゜35.36,37,38,39,40
,41゜42.43,44,45,46,47,48゜
49.50,51.52において、トラックに含まれて
いる混合変調信号が第4−b図に示す如く時間的にとり
だすことができる。ここで今注目しているトラックが図
のトラック4であるとすれば、変調信号として、と9だ
したいのは交点30゜34.39.44からの信号であ
υ、その他の交点から発生する混合変調信号はとりのぞ
く必要がある。そのようにサンプリングされた信号を第
4−b図に示す。
This is a track on which a modulated signal as shown in FIG. 3 is recorded. For example, when a minute spot is vibrated with track 4 as the center and straddles tracks 5 and 6 and track 3.2, as the disk rotates, the minute spot crosses each track and the intersection points 30, 31, 3
2,33,34゜35.36,37,38,39,40
, 41° 42.43, 44, 45, 46, 47, 48° 49.50, 51.52, the mixed modulation signal contained in the track can be extracted temporally as shown in Figure 4-b. can. If the track we are currently focusing on is track 4 in the diagram, the modulation signal we want to generate is the signal from the intersection 30°34.39.44, υ, and the signals generated from the other intersections. It is necessary to remove the mixed modulation signal. A signal so sampled is shown in Figure 4-b.

第5図に示すような多くのトラックより読出された信号
より、ある特定のトラック、例えばトラック4たけのも
のをサンプリングする機能を、第1図に示すパルスカウ
ンター13で行なわせている。第1図においてパルスカ
ウンター13は光偏向器10、光検知器14と連結され
ており、まず光偏向器10は、ディスクの外側即ち+側
に向って微少スポット9をふらせる。光検知器14では
第4−a図、第4−b図に示す如<、31.32の2個
の信号があられれる。2個の信号がくれば、パルスカウ
ンター13は光偏向器10に指令を与えディスク1の内
側即ち一側に向って微少スポット9をふらせるようにす
る。−f:つすると光検知器14では、第4−a、第4
−b図に示す如く、33.34,35,36.37の5
個の’Ig号があられれる。5個の信号のうち最初から
3査目の信号、即ち35をサンプリングして、復調器1
5に入れる。パルスカウンター13が5個のパルスを受
けるとパルスカウンター13は、光偏向器10に指令を
与えディスク1の外側即ち+側に向って微少スポット9
をふらせるようにする。上記のようなくり返しをするこ
とによって、特定のトラック、例えば4から信号30,
35,40,45゜50とと9だすことができる。
The pulse counter 13 shown in FIG. 1 performs a function of sampling a specific track, for example, four tracks from signals read out from many tracks as shown in FIG. In FIG. 1, a pulse counter 13 is connected to an optical deflector 10 and a photodetector 14. First, the optical deflector 10 swings a minute spot 9 toward the outside of the disk, that is, toward the + side. The photodetector 14 receives two signals of 31.32 and 31.32, as shown in FIGS. 4-a and 4-b. When the two signals are received, the pulse counter 13 gives a command to the optical deflector 10 to cause the minute spot 9 to waver toward the inside of the disk 1, that is, toward one side. -f: Then, in the photodetector 14, the fourth-a, the fourth
-b As shown in figure 33.34, 35, 36.37, 5
A number of 'Ig's are released. Out of the five signals, the third signal from the beginning, that is, 35, is sampled and the demodulator 1
Put it in 5. When the pulse counter 13 receives five pulses, the pulse counter 13 gives a command to the optical deflector 10 to direct the minute spot 9 toward the outside of the disk 1, that is, toward the + side.
Let it fluctuate. By repeating the above, from a specific track, for example, 4 to signal 30,
You can get 35, 40, 45°50 and 9.

以上詳述したように、本発明によれは、高密匿に空間的
に分布した情報の中から、回転ディスクに外乱があり、
振動しても、虐望の情報をトラッキングしながら順序よ
く再生できる方法を与える点で効果が太きい。
As detailed above, according to the present invention, when there is a disturbance on the rotating disk from among highly dense and spatially distributed information,
Even if it vibrates, it is very effective in that it provides a way to track and play back the information of abuse in an orderly manner.

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

第1図は本ヴ6明によるビデイオディスク杓生器の構成
図、第2図はディスク上への変調信号の記録形態を示す
図、第3図は本発明のディスク上への変調信号の記録形
態を示す図、第4−a、4−b図は本発明のトラッキン
グの説明図である。 1・・・回転ディスク、2,3,4,5.6・・・トラ
ック溝、7・・・光ビーム、8・・・来光レンズ、9・
・・微少ヌボット、10・・・光偏向器、11・・・ハ
ーフミラ−112・・・変調信号、13・・・パルスカ
ウンター、14・・・光検知器、15・・・復調器、2
1,22.23・・・変調信号のエレメント、30〜5
2・・・光ビームと溝の交点。 °不  Z  (久)  図 Z Z ζb) 図 第 3(幻 図 身l   3  (b)  トn 第 4−b  図 一\−(θラ 一〇−(l〕 (A、B、C) 変調信号
Fig. 1 is a block diagram of a video disc generator according to the present invention, Fig. 2 is a diagram showing the recording form of a modulation signal on a disc, and Fig. 3 is a diagram showing a recording form of a modulation signal on a disc according to the present invention. Figures 4-a and 4-b showing the recording format are explanatory diagrams of tracking according to the present invention. DESCRIPTION OF SYMBOLS 1... Rotating disk, 2, 3, 4, 5.6... Track groove, 7... Light beam, 8... Coming lens, 9...
...Micronubot, 10... Optical deflector, 11... Half mirror 112... Modulation signal, 13... Pulse counter, 14... Photodetector, 15... Demodulator, 2
1, 22.23... Element of modulation signal, 30 to 5
2... Intersection of the light beam and the groove. °F Z (ku) Figure Z Z ζb) Figure 3 (phantom figure l 3 (b) To n 4-b Figure 1\-(θL10-(l) (A, B, C) Modulation signal

Claims (1)

【特許請求の範囲】[Claims] 光源からのレーザビームを変調された情報を記録媒体上
に光学的に読み取り得る如くトラック状に凹凸又は濃淡
の形態で記録したディスクに集光し、上記レーザビーム
を上記トラックを横切る方向に偏光し、上記ディスクρ
・らの反射光を検出すると共に上記検出信号の出力に含
まれるトラッキング状態に関する信号を検出し、この検
出信号で上記レーザビームを偏光することを特徴とする
光トラッキングの方式。
A laser beam from a light source is focused on a disk on which modulated information is recorded in the form of tracks with unevenness or shading so that it can be optically read on the recording medium, and the laser beam is polarized in a direction across the tracks. , the above disk ρ
- An optical tracking method characterized in that the reflected light from the laser beam is detected, a signal related to the tracking state included in the output of the detection signal is detected, and the laser beam is polarized using this detection signal.
JP13582683A 1983-07-27 1983-07-27 Optical tracking system Pending JPS5963035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13582683A JPS5963035A (en) 1983-07-27 1983-07-27 Optical tracking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13582683A JPS5963035A (en) 1983-07-27 1983-07-27 Optical tracking system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP47118085A Division JPS5851330B2 (en) 1972-11-27 1972-11-27 Hikari Trucking No Hoshiki

Publications (1)

Publication Number Publication Date
JPS5963035A true JPS5963035A (en) 1984-04-10

Family

ID=15160691

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13582683A Pending JPS5963035A (en) 1983-07-27 1983-07-27 Optical tracking system

Country Status (1)

Country Link
JP (1) JPS5963035A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02211383A (en) * 1989-02-10 1990-08-22 Honda Motor Co Ltd Ignition timing controller for engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02211383A (en) * 1989-02-10 1990-08-22 Honda Motor Co Ltd Ignition timing controller for engine

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