JPS6356610B2 - - Google Patents
Info
- Publication number
- JPS6356610B2 JPS6356610B2 JP56183267A JP18326781A JPS6356610B2 JP S6356610 B2 JPS6356610 B2 JP S6356610B2 JP 56183267 A JP56183267 A JP 56183267A JP 18326781 A JP18326781 A JP 18326781A JP S6356610 B2 JPS6356610 B2 JP S6356610B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- sector
- information
- reproducing
- optical 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
Links
- 230000003287 optical effect Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 12
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00745—Sectoring or header formats within a track
Landscapes
- Optical Recording Or Reproduction (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Description
【発明の詳細な説明】
発明の技術分野
本発明はレーザビームを用いて情報の記録・再
生を光学的に行う光学的情報記録再生方式に関す
る。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an optical information recording and reproducing method for optically recording and reproducing information using a laser beam.
発明の技術的背景とその問題点
近時、高密度で大容量の情報記録を行なう記録
再生装置として、いわゆる光デイスク装置が注目
されている。これは例えば、レーザビームを直径
1μｍ程度に絞り込んで、光デイスクと呼ばれる
デイスク状の記録媒体に照射し、幅0.6〜1μｍ、
長さ１〜2μｍのピツトを形成して記録を行ない、
これをパワーを落した同様のレーザビームを用い
て再生するものである。Technical background of the invention and its problems Recently, so-called optical disk devices have been attracting attention as recording and reproducing devices that record high-density, large-capacity information. This means, for example, that the laser beam has a diameter
The beam is narrowed down to about 1 μm and irradiated onto a disk-shaped recording medium called an optical disk, with a width of 0.6 to 1 μm.
Recording is performed by forming pits with a length of 1 to 2 μm,
This is reproduced using a similar laser beam with reduced power.
この種の装置では一般に、情報を一定のビツト
数で構成される記録単位（以後セクタと言う）毎
に記録するが、その際再生時にこれら各セクタの
開始位置をいかに検出するかが重要な問題とな
る。このため従来は記録、再生時の光デイスクの
回転数を一定とし、第１図に示すごとく光デイス
クの回転数に同期して記録エリア１を第１セクタ
S1から第ｎセクタSoまでｎ分割して記録を行な
い、再生時においては予め何らかの方法で光デイ
スク上に付けられている回転開始マーク２から、
各セクタS1〜Soの開始位置を計算によつて検出す
る方法が用いられていた。 This type of device generally records information in recording units (hereinafter referred to as sectors) each consisting of a fixed number of bits, but an important problem is how to detect the starting position of each sector during playback. becomes. For this reason, in the past, the number of rotations of the optical disk during recording and playback was kept constant, and recording area 1 was moved to the first sector in synchronization with the number of rotations of the optical disk, as shown in Figure 1.
Recording is performed in n divisions from S 1 to the n-th sector S o , and during playback, starting from the rotation start mark 2 that has been placed on the optical disc in advance by some method,
A method has been used in which the starting position of each sector S 1 -S o is detected by calculation.
しかしながらこの方法では、光デイスクの回転
数を一定とする必要があるために、第１図に示す
ようにデイスクの外周部ほどセクタ長が長くな
り、従がつて記録容量の低下を招くという欠点を
有していた。 However, this method has the disadvantage that the number of rotations of the optical disk needs to be constant, so as shown in Figure 1, the sector length becomes longer towards the outer periphery of the disk, resulting in a decrease in recording capacity. had.
記録容量を上げるためには、光デイスクの回転
を線速一定とすればよいが、その場合には従来の
方法では、セクタの開始位置を検出することはで
きない。 In order to increase the recording capacity, the optical disc may be rotated at a constant linear velocity, but in this case, the starting position of a sector cannot be detected using conventional methods.
発明の目的
本発明の目的は、記録媒体である光デイスクの
回転を線速一定とした場合でも、各セクタの開始
位置を容易に検出できる光学的情報記録再生方式
を提供するにある。OBJECTS OF THE INVENTION It is an object of the present invention to provide an optical information recording and reproducing system that can easily detect the starting position of each sector even when the linear velocity of the rotation of an optical disk as a recording medium is constant.
発明の概要
本発明は記録媒体上の記録トラツクのセクタの
前に非記録領域を設け、これによつて再生時に各
セクタの開始位置を検出するようにしたものであ
る。SUMMARY OF THE INVENTION The present invention provides a non-recording area before each sector of a recording track on a recording medium, thereby detecting the starting position of each sector during reproduction.
発明の実施例
第２図は本発明を適用した光デイスク装置の概
略構成図である。光デイスク１１はモータ駆動回
路１３に接続されたモータ１２により線速一定、
即ちデイスク１１の中心から記録、再生位置まで
の距離をｒ、デイスク１の回転数をｗとした時、
2πrw＝一定となるように回転駆動される。１４
はレーザ発振器、レンズ、ミラー、その他を含む
周知の記録・再生用光学系であり、レーザビーム
をデイスク１１に照射して、光学的に情報の記
録、再生を行なうものである。Embodiments of the Invention FIG. 2 is a schematic configuration diagram of an optical disk device to which the present invention is applied. The optical disk 11 is driven at a constant linear velocity by a motor 12 connected to a motor drive circuit 13.
That is, when the distance from the center of the disk 11 to the recording/playback position is r, and the rotation speed of the disk 1 is w,
It is rotated so that 2πrw=constant. 14
is a well-known recording/reproducing optical system including a laser oscillator, lenses, mirrors, etc., and irradiates the disk 11 with a laser beam to optically record and reproduce information.
光デイスク１１への情報記録は、入力装置１５
からインターフエース１６を通して転送され一定
のビツト数からなるセクタ単位で書き込みデータ
バツフア１７に蓄積された情報データと、ブラン
ク発生回路１８で発生された一定のビツト数に相
当する長さのブランク信号とが、ブランク信号、
情報データの順に書き込み制御回路１９に与えら
れることによつて行なわれる。 Information is recorded on the optical disk 11 using an input device 15.
The information data transferred from the write data buffer 17 through the interface 16 and stored in the write data buffer 17 in sector units consisting of a fixed number of bits, and a blank signal having a length corresponding to the fixed number of bits generated by the blank generation circuit 18, blank signal,
This is done by applying the information data to the write control circuit 19 in order.
一方、光デイスク１１からの情報の再生に際し
ては、読み取り制御回路２０を通して、ピツトの
有／無により変調された光デイスク１１からの反
射（または透過）レーザ光に応じた電気信号を取
出し、この信号からまずブランク検出回路２１で
前記のブランク信号を検出して、セクタ開始位置
の検出を行なう。そして、この検出後、読み取り
制御回路２０により従来と同様の方式で情報デー
タを復調し、読み取りデータバツフア２２および
インターフエース１６を介してセクタ単位で情報
データを出力装置２３に転送する。 On the other hand, when reproducing information from the optical disc 11, an electric signal corresponding to the reflected (or transmitted) laser light from the optical disc 11 modulated by the presence/absence of pits is extracted through the read control circuit 20, and this signal First, the blank detection circuit 21 detects the blank signal to detect the sector start position. After this detection, the read control circuit 20 demodulates the information data in a manner similar to the conventional method, and transfers the information data sector by sector to the output device 23 via the read data buffer 22 and interface 16.
第３図は本発明による記録方式で全面に記録し
た時の光デイスク１１上の記録パターンを示した
もので、記録エリア３１の各トラツク３２はそれ
ぞれ前記ブランク信号によつて形成された非記録
領域３３をはさんで一定のビツト数で構成される
セクタ３４に分割され、かつ最外周のセクタ長
L1と、最内周のセクタ長Loとは等しくなつてい
る。 FIG. 3 shows a recording pattern on the optical disk 11 when the entire surface is recorded by the recording method according to the present invention, and each track 32 of the recording area 31 is a non-recording area formed by the blank signal. It is divided into sectors 34 consisting of a fixed number of bits across 33, and the length of the outermost sector is
L 1 and the innermost sector length L o are equal.
なお、非記録領域３３は例えば第４図のように
非ピツト部４１となつており、その長さLBはセ
クタ３４における情報に応じたピツト４２の長さ
lpより十分長く選ばれている。一例として、ｌの
最大値が2μｍとすれば、LBは100〜200μｍ程度、
つまりピツト数に換算して50〜100ピツト分程度
で十分である。 The non-recording area 33 is, for example, a non-pit portion 41 as shown in FIG. 4, and its length L B is the length of the pit 42 according to the information in the sector 34.
It has been chosen sufficiently longer than lp. As an example, if the maximum value of l is 2 μm, L B is about 100 to 200 μm,
In other words, in terms of the number of pits, about 50 to 100 pits is sufficient.
発明の効果
このように、本発明によればセクタの直前に非
記録領域を付加することで、デイスクの回転数変
化によることなく、容易に各セクタの開始位置が
検出できる。従つて、デイスクの線速を一定とす
ることで、外周部と内周部の記録密度を等しくし
て記録容量の増加を図つた場合でも、正しい再生
を行なうことができ、セクタのランダムアクセス
も容易となる。Effects of the Invention As described above, according to the present invention, by adding a non-recording area immediately before a sector, the starting position of each sector can be easily detected without depending on changes in the rotational speed of the disk. Therefore, by keeping the linear velocity of the disk constant, even if you try to increase the recording capacity by equalizing the recording density on the outer and inner circumferences, correct playback can be performed and random sector access can be achieved. It becomes easier.
尚、本発明は上記実施例に限定されるものでは
なく、１セクタを構成する情報データのビツト数
を例えば外周部と内周部とで変えた場合において
も、同様の効果を得ることができる。また、セク
タの開始位置の検出のための非記録領域は、連続
したピツトの形で設けてもよい。さらに、本発明
は回転数一定方式の光デイスク装置にも適用が可
能である。 It should be noted that the present invention is not limited to the above-mentioned embodiments, and the same effect can be obtained even when the number of bits of information data constituting one sector is changed between, for example, the outer circumference and the inner circumference. . Further, the non-recording area for detecting the start position of a sector may be provided in the form of a continuous pit. Furthermore, the present invention can also be applied to an optical disk device of a constant rotation speed type.
第１図は従来の光デイスク装置における記録方
式を説明するための図、第２図は本発明の一実施
例に係る光学的情報記録再生方式を適用した光デ
イスク装置の概略構成図、第３図は同実施例にお
ける光デイスク上の記録パターンを模式的に示す
図、第４図はセクタの開始位置検出のための非記
録領域の形成方法の具体例を示す図である。
１１……光デイスク、１２……モータ、１７…
…ブランク発生回路、２１……ブランク検出回
路、３１……記録エリア、３２……記録トラツ
ク、３３……非記録領域、３４……セクタ（記録
単位）、４１……非ピツト部、４２……情報ピツ
ト。
FIG. 1 is a diagram for explaining a recording method in a conventional optical disk device, FIG. 2 is a schematic configuration diagram of an optical disk device to which an optical information recording/reproducing method according to an embodiment of the present invention is applied, and FIG. This figure is a diagram schematically showing a recording pattern on an optical disk in the same embodiment, and FIG. 4 is a diagram showing a specific example of a method for forming a non-recording area for detecting the start position of a sector. 11... Optical disk, 12... Motor, 17...
... Blank generation circuit, 21 ... Blank detection circuit, 31 ... Recording area, 32 ... Recording track, 33 ... Non-recording area, 34 ... Sector (recording unit), 41 ... Non-pit portion, 42 ... Information pit.
Claims (1)
セクタ単位で光学的に記録・再生する方式におい
て、記録媒体上の記録トラツクの各セクタの前に
非記録領域を設け、再生時この非記録領域により
各セクタの開始位置を検出することを特徴とする
光学的情報記録再生方式。 ２ 記録媒体は情報をピツト列として記録するも
のであり、前記非記録領域はセクタ内の情報に対
応したピツトより十分長く形成された非ピツト部
またはピツトであることを特徴とする特許請求の
範囲第１項記載の光学的情報記録再生方式。 ３ 記録媒体はデイスク状であつて、情報の記
録・再生時に線速一定で回転されることを特徴と
する特許請求の範囲第１項記載の光学的情報記録
再生方式。[Claims] 1. In a method of optically recording and reproducing information sector by sector by irradiating a recording medium with a laser beam, a non-recording area is provided in front of each sector of a recording track on the recording medium, An optical information recording/reproducing method characterized in that during reproduction, the start position of each sector is detected using this non-recording area. 2. The recording medium records information as a row of pits, and the non-recording area is a non-pit portion or pit formed sufficiently longer than the pit corresponding to the information in the sector. The optical information recording and reproducing method according to item 1. 3. The optical information recording and reproducing method according to claim 1, wherein the recording medium is disk-shaped and rotated at a constant linear velocity during recording and reproducing information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18326781A JPS5885937A (en) | 1981-11-16 | 1981-11-16 | Optical information recording system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18326781A JPS5885937A (en) | 1981-11-16 | 1981-11-16 | Optical information recording system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5885937A JPS5885937A (en) | 1983-05-23 |
| JPS6356610B2 true JPS6356610B2 (en) | 1988-11-08 |
Family
ID=16132668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18326781A Granted JPS5885937A (en) | 1981-11-16 | 1981-11-16 | Optical information recording system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5885937A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5194363A (en) * | 1990-04-27 | 1993-03-16 | Matsushita Electric Industrial Co., Ltd. | Optical recording medium and production process for the medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54138606U (en) * | 1978-03-20 | 1979-09-26 |
-
1981
- 1981-11-16 JP JP18326781A patent/JPS5885937A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5885937A (en) | 1983-05-23 |
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