JPS5841446A - Optical information tracking system - Google Patents

Optical information tracking system

Info

Publication number
JPS5841446A
JPS5841446A JP13858081A JP13858081A JPS5841446A JP S5841446 A JPS5841446 A JP S5841446A JP 13858081 A JP13858081 A JP 13858081A JP 13858081 A JP13858081 A JP 13858081A JP S5841446 A JPS5841446 A JP S5841446A
Authority
JP
Japan
Prior art keywords
information
tracks
optical
light
spot
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
JP13858081A
Other languages
Japanese (ja)
Inventor
Yoshito Tsunoda
義人 角田
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.)
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 JP13858081A priority Critical patent/JPS5841446A/en
Publication of JPS5841446A publication Critical patent/JPS5841446A/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
    • G11B7/0938Disposition 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 servo format, e.g. guide tracks, pilot signals
    • 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
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085Pits

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To perform tracking with high accuracy, without being affected by recorded pits, by performing tracking over two guide tracks and recording information between the guide tracks. CONSTITUTION:An optical spot 6a from a light source (not shown) is positioned at the right side of a guide track 16b on an optical disc, an optical spot 6c is positioned at the left side of a guide track 16a and an optical spot 6b is positioned between the tracks 16a and 16b. In controlling the position of the optical spots so that the amount of reflected light of the spots 6a and 6c can be made just equal, the spot 6b is located at the center of the tracks 16a and 16b and in recording information with the spot 6b, a pit 17 is formed. When address information and synchronizing signals are desired to be recorded on the disc in advance, a pit 18 for recorded information is recorded between the guide tracks 16b and 16c.

Description

【発明の詳細な説明】 本発明は、光ディスク等の光メモリ装置の光学的情報追
跡方式、とくに、情報を実時間に記録再生する光デイス
クメモリにおける正確な情報の追跡方式に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information tracking method for an optical memory device such as an optical disk, and more particularly to an accurate information tracking method for an optical disk memory that records and reproduces information in real time.

従来、光ビデオディスク、PCM光ディスク、ディジタ
ル情報を記録再生する光デイスクメモリ装置等において
、ディスク面上の情報トラックを±0.1μm程度の正
確さをもって、追跡するトラッキング技術が不可欠なも
のとなっている。その代表的な方式として、第1図Aに
示すように、ディスク面上に3つの光点を形成せしめ、
これによってトラッキングをする方法が知られている。
Conventionally, in optical video discs, PCM optical discs, optical disc memory devices for recording and reproducing digital information, etc., tracking technology that tracks information tracks on the disc surface with an accuracy of approximately ±0.1 μm has become indispensable. There is. A typical method is to form three light spots on the disk surface, as shown in Figure 1A.
A method of tracking using this is known.

第1図Aにおいて、レーザ光源1から出たレーザ光束2
は、レンズ3によって平行光束となり、回折格子4によ
って、0次光、±1次光の3つの光束に別れた後、ミラ
ー15によって反射され、絞シ込みレンズ5によって、
ディスク7上に3つの光点5a、6b、6Cとして絞シ
込まれる。3つの光点5a、6b、5Cは、ディスク7
上のトラック16上に第1図Bに示すようにトラック1
6の方向に対してθの傾斜を持つように形成される。
In FIG. 1A, a laser beam 2 emitted from a laser light source 1
becomes a parallel beam of light by the lens 3, is divided into three beams of 0th-order light and ±1st-order light by the diffraction grating 4, is reflected by the mirror 15, and is reflected by the diaphragm lens 5,
The light is focused on the disk 7 as three light spots 5a, 6b, and 6C. The three light spots 5a, 6b, 5C are located on the disk 7.
Track 1 on top track 16 as shown in FIG. 1B.
It is formed to have an inclination of θ with respect to the direction of 6.

ディスク7面からの反射光束は、ハーフミラ−8によっ
て、光検出器10a、10b、IOC上に導びかれる。
The reflected light beam from the surface of the disk 7 is guided by a half mirror 8 onto photodetectors 10a, 10b and IOC.

この時、光点5a、6b、6Cは各々光検出器10a、
10b、IOCに対応して検出される。光検出器10b
からの出力はアンプ12を経て信号再生回路へと導ひか
れる。光検出器10a及びIOCの出力は差動アンプ1
1を通り差動出力となυ、サーボ回路13を通過後、ミ
ラー15の駆動器14へ導びかれミラー15をトラック
ずれ電に対応して回転させ、トラッキング全行なう。つ
まり第1図Aにおいてトラック16が右にずれれば光点
6aからの反射光量は減少し、光点6Cからの反射光量
は増加する。トラック16が左にずれれば、その逆とな
る。常に6aと60からの反射光量、つまシ光検出器1
0aと100からの出力が同じになるようにミラー15
を制御してやればよい。この方式は、光ビデオディスク
あるいは光PCMディスクのようにあらかじめ情報がト
ラック上に形成されているものに対しては、安定なトラ
ッキングを行なうことができるが、ディジタル情報、あ
るいはビデオ情報等を実時間で記録し再生する光デイス
クメモリに対しては従来大きな欠点を持っていた。つま
り第2図に示すように、ディスク上にあらかじめ案内〜
トラック16a、16b、16Cが形成されテオリ、さ
らにその上に金属薄膜等の記録膜が形成され、この記録
膜に情報に対応したピット(穴)17を形成してゆくが
如き、光デイスクメモリにおいては、光点6bによって
情報を記録し、光点5a。
At this time, the light spots 5a, 6b, and 6C are each detected by a photodetector 10a,
10b, detected corresponding to IOC. Photodetector 10b
The output from the amplifier 12 is led to a signal reproducing circuit. The output of the photodetector 10a and IOC is output from the differential amplifier 1.
After passing through the servo circuit 13, the signal υ is guided to the driver 14 of the mirror 15, and the mirror 15 is rotated in accordance with the track deviation current, thereby performing full tracking. That is, if the track 16 shifts to the right in FIG. 1A, the amount of reflected light from the light spot 6a decreases, and the amount of reflected light from the light spot 6C increases. The opposite is true if the track 16 shifts to the left. Constant amount of reflected light from 6a and 60, light detector 1
Mirror 15 so that the output from 0a and 100 are the same
All you have to do is control it. This method can perform stable tracking for optical video discs or optical PCM discs where information is formed on the tracks in advance, but it is possible to perform stable tracking for discs with information formed on the tracks in advance, such as optical video discs or optical PCM discs. Conventionally, optical disk memories that record and play back data have had major drawbacks. In other words, as shown in Figure 2, it is pre-guided on the disk.
In an optical disk memory, tracks 16a, 16b, 16C are formed, a recording film such as a thin metal film is formed on top of the tracks, and pits 17 corresponding to information are formed in this recording film. The light spot 6b records information, and the light spot 5a records information.

6Cによってトラッキング信号を得んとすると、光点6
aは情報の未記録領域にあり、光点6Cは情報の既記縁
領域にあるため、その反射光量は、トラックずれのない
状態においても、均等にならなくなってしまう。しかも
、記録情報のパターンつまシピットの配列パターンによ
ってその不均等さは大きく変化し、これによってトラッ
キングの精度を大幅に悪くしてしまう。
When trying to obtain a tracking signal using 6C, the light point 6
Since the light spot 6C is located in the area where information is not recorded and the light spot 6C is located in the edge area where information is recorded, the amount of reflected light is not equal even in a state where there is no track deviation. In addition, the non-uniformity varies greatly depending on the pattern of the recorded information or the arrangement pattern of the pits, which significantly deteriorates the accuracy of tracking.

本発明は、前述した従来のトラッキングの欠点を解決し
高精度の情報追跡方式を提供せしめるものである。
The present invention solves the above-described drawbacks of conventional tracking and provides a highly accurate information tracking method.

かかる目的を達成するために本発明は2つの案内トラッ
クにまだがって、トラッキングを行ない、情報を案内ト
ラック間に記録することによって、既記縁ビットの影響
を受けることなく高精度のトラッキングを行なわしめる
ものである。
In order to achieve this object, the present invention performs tracking along two guide tracks and records information between the guide tracks, thereby achieving high-precision tracking without being affected by recorded edge bits. It is something to be done.

以下、本発明を実施例を参照して詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to Examples.

第3図は本発明の一実施例を説明する図である。FIG. 3 is a diagram illustrating an embodiment of the present invention.

図において3光点6a、6b、6Cの中、6aは案内ト
ラック16bの右側にかかつて位置しており、6Cは右
隣りの案内トラック16Hの左側にかかつて位置してお
シ、さらに6bは案内トラック16a、16bの間の領
域に位置している。
In the figure, among the three light points 6a, 6b, and 6C, 6a is located on the right side of the guide track 16b, 6C is located on the left side of the adjacent guide track 16H on the right, and 6b is located on the left side of the guide track 16H adjacent to the right. It is located in the area between the guide tracks 16a, 16b.

6a、6cの反射光量の差をとると、トラックが右側へ
ずれると、6cの反射光量が増加し、6aの反射光蓋が
減少する。トラックが左側へずれると、その逆になる。
Taking the difference in the amount of reflected light from 6a and 6c, when the track shifts to the right, the amount of reflected light from 6c increases and the amount of reflected light from 6a decreases. If the truck shifts to the left, the opposite will occur.

6a、6cの反射光量が丁度等しくなるように光点の位
置を制御してやると、光点6bは常にトラック間の中央
にいることになる。6bによって情報の記録を行なうと
トラック間中央にピット(穴)17が形成される。光点
6cは案内トラック16a上に配置しているので、ピッ
ト17上に重なることはなく情報の既記縁領域にあって
も光量の変動はなくなり)ラックずれのない時は光点6
aと等光点となる。
If the position of the light spot is controlled so that the amounts of reflected light from 6a and 6c are exactly equal, the light spot 6b will always be located at the center between the tracks. When information is recorded using 6b, a pit 17 is formed at the center between the tracks. Since the light spot 6c is placed on the guide track 16a, it does not overlap the pit 17 and there is no fluctuation in the light amount even if it is in the edge area where information is written.) When there is no rack shift, the light spot 6
It becomes an isophotic point with a.

さらに、ディジタル情報の記録再生の場合のように、あ
らかじめアドレス情報、同期信号等をディスク面上に記
録しておきたい場合には、第3図に示すように低記録情
報のピット18を案内トラック間に記録しておけば良い
。第3図における3つの光点の作成およびその検出につ
いては、第1図に示す、従来の装置と同じものを用いれ
ば良い。
Furthermore, when it is desired to record address information, synchronization signals, etc. on the disk surface in advance, as in the case of recording and reproducing digital information, the pits 18 of low recording information are placed on the guide track as shown in FIG. You should record it in the meantime. For creation and detection of the three light spots in FIG. 3, the same conventional device as shown in FIG. 1 may be used.

なお案内トラックについては、その深さ、幅については
とくに規制するものではないが、例えばピッチ2.5μ
m1幅0.4〜0.8μm程度、深さλ/4からλ/8
程度のものが適している。さらに情報記録媒体について
は、やは夛とくに規制するものではないが、例えば、F
e、Se、As。
Regarding the guide track, there are no particular restrictions on its depth and width, but for example, the pitch is 2.5 μm.
m1 width approximately 0.4 to 0.8 μm, depth λ/4 to λ/8
Appropriate. Furthermore, information recording media are not particularly regulated, but for example,
e, Se, As.

pb、In等を含んだ厚さ100〜500A程度のもの
を用いると良い。
It is preferable to use a material containing PB, In, etc. and having a thickness of about 100 to 500 Å.

以上説明したように、本発明を用いることによって、実
時間に情報を記録再生する光デイスクメモリ装置におけ
る安定なトラッキング方式を提供せしめることが可能と
なる。
As described above, by using the present invention, it is possible to provide a stable tracking method in an optical disk memory device that records and reproduces information in real time.

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

第1図A及び第1図Bは従来の情報追跡方式を示す図、
第2図はその動作を説明するための図、第3図は本発明
の一実施例を説明するための図である。 ’%I    ℃a  (Δ) I? ′l 葛    1    図  (B) 6 あ Z  巳 /4Z 3  図 /6b   /1561−
FIG. 1A and FIG. 1B are diagrams showing conventional information tracking methods,
FIG. 2 is a diagram for explaining its operation, and FIG. 3 is a diagram for explaining one embodiment of the present invention. '%I °Ca (Δ) I? 'l Kuzu 1 Figure (B) 6 A Z Snake/4Z 3 Figure/6b/1561-

Claims (1)

【特許請求の範囲】[Claims] 1、 レーザ光源と、レーザ光源からのレーザ光束を案
内トラックを有する記録媒体に導ひく手段と、上記レー
ザ光束の該記録媒体からの反射光束を検出する手段と、
上記案内トラック上へ該レーザ光束を導ひく手段とによ
って情報の追跡を行う情報追跡方式において、核し−ザ
光東を記録媒体上へ導びく手段の中に設けられた該レー
ザ光束を回折する回折手段と、上記レーザ光束及び上記
回折光束を上記記録媒体上へ、3つの光点として収束せ
しめる手段を有し、かつ上記3つの光点が、それぞれ1
つの案内トラック、案内トラック間の中間領域及びその
中間領域に隣接する他の1つの釆内トラック上に配置さ
れておシ、上記3つの光点の各々の上記記録媒体からの
反射光束を独立に検出すべく上記光検出器を3個具備し
たことを特徴とする光学的情報追跡方式。
1. A laser light source, means for guiding a laser beam from the laser light source to a recording medium having a guide track, and means for detecting a reflected beam of the laser beam from the recording medium;
In the information tracking method in which information is tracked by a means for guiding the laser beam onto the guide track, the laser beam is diffracted in the means for guiding the laser beam onto the recording medium. and a means for converging the laser beam and the diffracted beam onto the recording medium as three light spots, and each of the three light spots has one light spot.
two guide tracks, an intermediate area between the guide tracks, and one other track adjacent to the intermediate area; An optical information tracking system characterized by comprising three of the above photodetectors for detection.
JP13858081A 1981-09-04 1981-09-04 Optical information tracking system Pending JPS5841446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13858081A JPS5841446A (en) 1981-09-04 1981-09-04 Optical information tracking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13858081A JPS5841446A (en) 1981-09-04 1981-09-04 Optical information tracking system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP5043585A Division JPS60217538A (en) 1985-03-15 1985-03-15 Optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS5841446A true JPS5841446A (en) 1983-03-10

Family

ID=15225436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13858081A Pending JPS5841446A (en) 1981-09-04 1981-09-04 Optical information tracking system

Country Status (1)

Country Link
JP (1) JPS5841446A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6050733A (en) * 1983-08-31 1985-03-20 Sony Corp Optical recording medium and producer of master disk of said medium
JPS6050848A (en) * 1983-08-31 1985-03-20 Wako Gomme Kogyo Kk X-ray leakage prevention device for anode cap
EP0147620A2 (en) * 1983-11-22 1985-07-10 Kabushiki Kaisha Toshiba Optical head
FR2562701A1 (en) * 1984-04-06 1985-10-11 Drexler Tech OPTICAL SYSTEM WITH THREE PRESERVED GUIDED BEAMS FOR READING ON TWO PARALLEL TRACKS
JPS60261038A (en) * 1984-06-07 1985-12-24 Victor Co Of Japan Ltd Recording and reproducing system of information recording medium disc possible for repetitive recording
NL8601566A (en) * 1985-06-19 1987-01-16 Hitachi Ltd DEVICE AND RECORD CARRIER FOR AN OPTICAL DISC MEMORY AND A MASTER DISC CUTTING DEVICE.
EP0239131A2 (en) * 1986-03-28 1987-09-30 Csk Corporation Tracking method for an optical recording medium
JPS6344322A (en) * 1986-08-12 1988-02-25 Canon Inc Optical information recording medium
US4754339A (en) * 1985-11-15 1988-06-28 Teac Corporation Information recording disc pre-recorded with address and pseudo address signals
US4803677A (en) * 1985-06-28 1989-02-07 Teac Corporation Rotary recording medium having a guide track and recording and reproducing apparatus therefor
US4893298A (en) * 1985-01-22 1990-01-09 U.S. Philips Corporation Record-carrier body provided with a relief structure of optically detectable servo-track portions and sector addresses and apparatus for forming said structure
US4991163A (en) * 1987-02-27 1991-02-05 Hitachi, Ltd. Optical information medium with sample mark area and multiple transcription prevention
US5025439A (en) * 1987-11-24 1991-06-18 Pioneer Electronic Corporation Method for recording and reproducing of information on an optical disk of a phase-change type
US5027338A (en) * 1987-12-25 1991-06-25 Kyocera Corporation Tracking defect preventing circuit
US5132953A (en) * 1985-06-21 1992-07-21 Olympus Optical Co., Ltd. Multi-beam optical recording/reproducing apparatus for recording/reproducing on a medium having a recording flat part with a guide groove on each side
US5144552A (en) * 1986-07-25 1992-09-01 Ricoh Company, Ltd. Optical information storage medium having grooves and pits with specific depths, respectively
US5666345A (en) * 1987-09-02 1997-09-09 Sharp Kabushiki Kaisha Optical memory medium with predetermined guide tracks and prepits

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534340A (en) * 1978-08-31 1980-03-10 Nippon Hoso Kyokai <Nhk> Recording reproducing system by light beam

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534340A (en) * 1978-08-31 1980-03-10 Nippon Hoso Kyokai <Nhk> Recording reproducing system by light beam

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6050848A (en) * 1983-08-31 1985-03-20 Wako Gomme Kogyo Kk X-ray leakage prevention device for anode cap
JPH0534737B2 (en) * 1983-08-31 1993-05-24 Sony Corp
JPS6050733A (en) * 1983-08-31 1985-03-20 Sony Corp Optical recording medium and producer of master disk of said medium
EP0147620A2 (en) * 1983-11-22 1985-07-10 Kabushiki Kaisha Toshiba Optical head
FR2562701A1 (en) * 1984-04-06 1985-10-11 Drexler Tech OPTICAL SYSTEM WITH THREE PRESERVED GUIDED BEAMS FOR READING ON TWO PARALLEL TRACKS
US4598393A (en) * 1984-04-06 1986-07-01 Drexler Technology Corporation Three-beam optical servo tracking system with two-track parallel readout
JPS60261038A (en) * 1984-06-07 1985-12-24 Victor Co Of Japan Ltd Recording and reproducing system of information recording medium disc possible for repetitive recording
US4893298A (en) * 1985-01-22 1990-01-09 U.S. Philips Corporation Record-carrier body provided with a relief structure of optically detectable servo-track portions and sector addresses and apparatus for forming said structure
NL8601566A (en) * 1985-06-19 1987-01-16 Hitachi Ltd DEVICE AND RECORD CARRIER FOR AN OPTICAL DISC MEMORY AND A MASTER DISC CUTTING DEVICE.
US4949331A (en) * 1985-06-19 1990-08-14 Hitachi, Ltd. Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus
US5132953A (en) * 1985-06-21 1992-07-21 Olympus Optical Co., Ltd. Multi-beam optical recording/reproducing apparatus for recording/reproducing on a medium having a recording flat part with a guide groove on each side
US4803677A (en) * 1985-06-28 1989-02-07 Teac Corporation Rotary recording medium having a guide track and recording and reproducing apparatus therefor
US4754339A (en) * 1985-11-15 1988-06-28 Teac Corporation Information recording disc pre-recorded with address and pseudo address signals
EP0239131A2 (en) * 1986-03-28 1987-09-30 Csk Corporation Tracking method for an optical recording medium
US5144552A (en) * 1986-07-25 1992-09-01 Ricoh Company, Ltd. Optical information storage medium having grooves and pits with specific depths, respectively
JPS6344322A (en) * 1986-08-12 1988-02-25 Canon Inc Optical information recording medium
JPH053053B2 (en) * 1986-08-12 1993-01-13 Canon Kk
US4991163A (en) * 1987-02-27 1991-02-05 Hitachi, Ltd. Optical information medium with sample mark area and multiple transcription prevention
US5666345A (en) * 1987-09-02 1997-09-09 Sharp Kabushiki Kaisha Optical memory medium with predetermined guide tracks and prepits
US5025439A (en) * 1987-11-24 1991-06-18 Pioneer Electronic Corporation Method for recording and reproducing of information on an optical disk of a phase-change type
US5027338A (en) * 1987-12-25 1991-06-25 Kyocera Corporation Tracking defect preventing circuit

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