JPS6360447B2 - - Google Patents
Info
- Publication number
- JPS6360447B2 JPS6360447B2 JP60010861A JP1086185A JPS6360447B2 JP S6360447 B2 JPS6360447 B2 JP S6360447B2 JP 60010861 A JP60010861 A JP 60010861A JP 1086185 A JP1086185 A JP 1086185A JP S6360447 B2 JPS6360447 B2 JP S6360447B2
- Authority
- JP
- Japan
- Prior art keywords
- track
- record carrier
- signal
- depth
- light beam
- 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 16
- 238000001514 detection method Methods 0.000 claims description 6
- 230000010365 information processing Effects 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000758 substrate Substances 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
- G11B7/09—Disposition 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は記録担体の情報トラツクに光ビームを
照射し情報の読み取りを行う情報処理装置および
その記録担体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 an information processing apparatus that reads information by irradiating an information track of a record carrier with a light beam, and a record carrier thereof.
情報をトラツク状に形成した光デイスク等を用
いて記録・再生する場合、そのトラツクを追従す
るためのトラツキング制御を行なう必要がある。
When recording and reproducing information using an optical disk or the like formed in the shape of a track, it is necessary to perform tracking control to follow the track.
その１つの手法として、記録担体上のトラツク
をある一定周波数でトラツク走査方向と直角な方
向に微少振動した状態で記録するとともに、その
振動方向を弁別するためのパイロツト信号を情報
信号に入れておき、再生する時にトラツクの中心
ズレをその再生信号のエンベロツプ微少振動成分
を利用して検出し、光スポツトのトラツキング制
御を行なう、プリウオーブリング法が知られてい
る。（例えば、特公昭54−15727号公報参照）この
方式は、再生装置に制御信号の検出のための余分
な光学部品やその他のアクチユエータが必要ない
ので、再生装置が簡単で、優れた方式である。し
かしこの方式は、微少振動の成分を同期検波する
必要があるため、主情報信号の中にパイロツト信
号を入れるとか、または主情報信号の同期信号を
利用しなければならないという制約がある。この
ため主情報が制限されたり、単一周波数の信号の
再生をすることができないという欠点があつた。
また記録再生型の光情報デイスクシステムの場合
は、デイスクに案内トラツクをあらかじめもつと
便利であり、この案内トラツクを光スポツトがト
ラツキングをし、記録する必要がある。しかし、
このプリウオブリング法でトラツキングをするた
めには、案内トラツクに何らかの形で微少振動の
位相弁別用のパイロツト信号を入れる必要があ
る。従来は適した方法がなかつた。 One method is to record a track on a record carrier with slight vibrations at a certain constant frequency in a direction perpendicular to the track scanning direction, and to include a pilot signal in the information signal to discriminate the direction of vibration. A pre-warbling method is known in which the center deviation of a track during reproduction is detected using the envelope minute vibration component of the reproduced signal, and tracking control of the optical spot is performed. (For example, see Japanese Patent Publication No. 54-15727.) This method is an excellent method because the reproducing device does not require any extra optical parts or other actuators for detecting the control signal, so the reproducing device is simple. . However, since this method requires synchronous detection of minute vibration components, there are restrictions in that a pilot signal must be included in the main information signal or a synchronization signal of the main information signal must be used. For this reason, the main information was limited and a signal of a single frequency could not be reproduced.
In the case of a recording/reproduction type optical information disk system, it is convenient to have a guide track on the disk in advance, and it is necessary for an optical spot to track and record this guide track. but,
In order to perform tracking using this pre-wobbling method, it is necessary to input some form of pilot signal for phase discrimination of minute vibrations into the guide track. Until now, there was no suitable method.
本発明は、かかる点に鑑みてなされたものであ
り、主情報信号または案内トラツクを制限するこ
となく位相弁別用信号を記録し得る記録媒体及び
情報処理装置を提供するものである。
The present invention has been made in view of this point, and provides a recording medium and an information processing apparatus that can record a phase discrimination signal without limiting the main information signal or the guide track.
かかる目的を達成するため、本発明は、ウオブ
リングの位相弁別用信号を主情報信号又は案内ト
ラツクのピツト・溝の深さを変えて記録すること
を特徴とする。
In order to achieve this object, the present invention is characterized in that the wobbling phase discrimination signal is recorded by changing the depth of the main information signal or the pits/grooves of the guide track.
以下図面を用いて詳しく説明する。第１図に本
発明を用いた光情報処理装置の概略を示す。デイ
スク１の情報面にはピツトと呼ばれる凸凹がトラ
ツク状に設けられている。レーザ等の光源２の光
ビームをレンズ３、ハーフミラー４を通し絞り込
みレンズ５でデイスク１の情報面に集光する。ピ
ツトにより変調された反射光はハーフミラー４で
反射され光検出器６で電気信号に変換される。光
検出器６は、トラツク方向にそつて２分割されて
おり、それぞれ加算器７と差分器８でその反射光
量をとらえることができることを示す。主情報は
端子９より加算器７の出力としてえられる。次に
本発明をそのデイスクのピツト形状とその再生波
形を示した第２図を併用し説明する。本発明は、
トラツキング検出信号を得るために、あらかじめ
記録ピツトをピツト巾より小さい振巾である周期
でウオブリングをし記録する。ピツトが周期的に
そのトラツク走査方向と垂直な方向にウオブリン
グされている状態を第２図のｂに示す。さらに本
発明で用いる記録担体は、ウオブリングの周期と
同期して、ピツトの深さを第２図ａに示すように
d1の領域とd2の領域と２段階に記録する。これ
は、ピツト（その平面的形状を第２図ｂで示す）
の位相深さ（光学的深さ）を変えて、その反射光
量の分布をみたとき、光スポツトがピツトを横切
つたとき、位相深さ（光学的深さ）がその読み出
し光の波長λの1/4を境に逆転することを利用す
るためである。この点を詳しく述べると、イの領
域は位相深さ（光学的深さ）をλ／４より多少浅
くd1としておき、ロの領域は位相深さ（光学的深
さ）をλ／４より多く深くd2としておく。この時
トラツクを光スポツトで走査し、その走査方向に
２分割した検出器６−１，６−２の差動出力を第
２図ｄに示す。第２図ｄはそのピツトの中心をＯ
として、d1とd2で再生出力の方向が逆転している
ことを示す。差動出力はその位相深さ（光学的深
さ）がλ／８にピークを持ちλ／４で零となり
３／8λでまたピークを持つ。但しそのλ／８と
３／8λの時その再生信号の位相は逆転すること
がわかつている。ちなみにピツトの位相深さ（光
学的深さ）がλ／４の時変調度は一番大きくな
る。よつてd1とd2は、変調度が大きく劣化せず、
その差動信号（第２図ｄで示す）が検出できる程
度に設定するのが好ましい。このλ／４からのシ
フト量はλ／20程度で十分であり、この場合に
は、主情報の劣化は1dB程度であり問題ない。第
２図ｃは加算器の出力を示し、これが主情報信号
である。実際スポツトがトラツクの中心からずれ
た場合はこの波形のエンベロツプがウオブリング
の周波数で変調された形で再生される。このエン
ベロツプ変化の大きさと位相がトラツク中心から
のズレと方向を示しているので、これをバンドパ
スフイルター１３でとりだし同期検波回路１４で
処理する。また同期をとるための信号（第２図ｇ
で示す）は差分信号を微分回路１０を通し、第２
図ｅに示す如き波形にしたのち加算信号（第２図
ｃで示す）と掛算器１１で掛算し、第２図ｆに示
す如き波形にし、ローパスフイルター１２を通し
て得ることができる。以上のようにすることによ
り、主情報の形によることがなく、位相検波用信
号ｇが得られる点が本発明の特徴である。
This will be explained in detail below using the drawings. FIG. 1 shows an outline of an optical information processing device using the present invention. The information side of the disc 1 is provided with track-like irregularities called pits. A light beam from a light source 2 such as a laser passes through a lens 3 and a half mirror 4 and is focused onto the information surface of the disk 1 by a focusing lens 5. The reflected light modulated by the pit is reflected by a half mirror 4 and converted into an electrical signal by a photodetector 6. The photodetector 6 is divided into two parts along the track direction, and an adder 7 and a subtractor 8 can detect the amount of reflected light. The main information is obtained from the terminal 9 as the output of the adder 7. Next, the present invention will be explained with reference to FIG. 2, which shows the pit shape of the disk and its reproduced waveform. The present invention
In order to obtain a tracking detection signal, the recording pit is wobbled in advance at a period with an amplitude smaller than the pit width and recorded. FIG. 2b shows a state in which the pits are periodically wobbled in a direction perpendicular to the track scanning direction. Furthermore, the record carrier used in the present invention can change the depth of pits in synchronization with the wobbling period as shown in FIG. 2a.
Record in two stages: d1 area and d2 area. This is a pit (its planar shape is shown in Figure 2b).
When we look at the distribution of the amount of reflected light by changing the phase depth (optical depth) of the light spot, when the light spot crosses the pit, the phase depth (optical depth) is This is to take advantage of the reversal after 1/4. To explain this point in detail, the phase depth (optical depth) of region A is set to d 1, which is slightly shallower than λ/4, and the phase depth (optical depth) of region B is set to d 1 , which is slightly shallower than λ/4. Leave it as deep as d 2 . At this time, the track is scanned with a light spot, and the differential outputs of the detectors 6-1 and 6-2, which are divided into two in the scanning direction, are shown in FIG. 2d. Figure 2 d shows the center of the pit as O.
shows that the direction of the playback output is reversed between d 1 and d 2 . The phase depth (optical depth) of the differential output has a peak at λ/8, becomes zero at λ/4, and has another peak at 3/8λ. However, it is known that the phase of the reproduced signal is reversed when the wavelength is λ/8 and 3/8λ. Incidentally, the modulation degree is greatest when the pit phase depth (optical depth) is λ/4. Therefore, the modulation depth of d 1 and d 2 does not deteriorate significantly, and
It is preferable to set it to such a level that the differential signal (shown as d in FIG. 2) can be detected. A shift amount of about λ/20 from λ/4 is sufficient, and in this case, the deterioration of the main information is about 1 dB, which is not a problem. Figure 2c shows the output of the adder, which is the main information signal. In fact, if the spot deviates from the center of the track, the envelope of this waveform is reproduced modulated by the wobbling frequency. Since the magnitude and phase of this envelope change indicate the deviation and direction from the track center, this is extracted by the bandpass filter 13 and processed by the synchronous detection circuit 14. Also, a signal for synchronization (Fig. 2g)
) passes the difference signal through the differentiating circuit 10 and outputs the second
After forming the waveform as shown in FIG. 2E, the signal is multiplied by the addition signal (shown in FIG. 2C) in a multiplier 11 to obtain a waveform as shown in FIG. The feature of the present invention is that by doing the above, the phase detection signal g can be obtained regardless of the form of the main information.
次に案内トラツクを用いて記録再生を行う場合
の実施例を説明する。案内トラツクを用いて記録
する場合は、その案内トラツクをトラツキング
し、光で金属膜に穴をあける必要がある。このよ
うな場合は、ウオブリング周期を情報を記録する
場合の同期信号として利用することができる。そ
うすることに本発明の効果はより大きくなる。よ
つて案内トラツクを記録信号のクロツクと同じ周
期にすることにより記録が容易になる。しかし留
意すべき点は、案内トラツクの位相深さ（光学的
深さ）をλ／４付近にするため、案内トラツクに
よる変調が大きくなりすぎ、実際に記録した情報
のＳ／Ｎが劣してしまう可能性がある。よつて通
常一番変調度がかせげるトラツク巾である再生・
記録スポツト径の1/3〜1/4をはずす必要がある。
これは巾がせまい方でも広い方でもかまわない。 Next, an embodiment in which recording and reproduction are performed using a guide track will be described. When recording using a guide track, it is necessary to track the guide track and make a hole in the metal film using light. In such a case, the wobbling period can be used as a synchronization signal when recording information. By doing so, the effects of the present invention will be even greater. Therefore, recording is facilitated by setting the guide track to have the same period as the clock of the recording signal. However, it should be noted that since the phase depth (optical depth) of the guide track is set to around λ/4, the modulation by the guide track becomes too large and the S/N of the actually recorded information becomes poor. There is a possibility that it will be stored away. Therefore, playback, which is the track width where the modulation degree usually increases the most,
It is necessary to remove 1/3 to 1/4 of the recording spot diameter.
This can be narrow or wide.
案内トラツクの構造の例を第３図に示す。第３
図ａ及び第３図ｂは連続トラツクの例で第３図ａ
は平面図、第３図ｂは断面図を示す。案内トラツ
ク２０は２０ａ，２０ｂの２つの領域に２分し、
トラツク走査方向にウオブリングして記録すると
共にこれと同期して、トラツクの光学的深さをd1
（λ／４−α）とd2（λ／４＋α）に変調してお
く。基板２２の上に記録膜２３がコートされてい
ることを示す。記録はこの記録膜２３に光で穴を
あけることになり、たとえば図に破線で示したよ
うに２１の円のように穴があくことになる。かわ
り目に記録した様子になつているが、この方が再
生する場合に簡単になり、トラブルが少ない。 An example of the structure of the guide track is shown in FIG. Third
Figures a and 3b are examples of continuous tracks;
shows a plan view, and FIG. 3b shows a cross-sectional view. The guide track 20 is divided into two areas 20a and 20b,
The optical depth of the track is recorded by wobbling in the track scanning direction and in synchronization with this .
(λ/4-α) and d 2 (λ/4+α). It shows that the recording film 23 is coated on the substrate 22. For recording, a hole is made in this recording film 23 using light, and for example, a hole like a circle 21 is made as shown by the broken line in the figure. Instead, it looks like it was recorded, but this is easier to play back and causes fewer problems.
次に間欠点な構造の例を第３図ｃ及び第３図ｄ
に示した。これも同様に記録再生ができる。 Next, examples of defective structures are shown in Figures 3c and 3d.
It was shown to. This can also be recorded and played back in the same way.
以上本発明の実施例の一部を説明したが、同期
の整数倍のくり返し長さにしてもよいし、同期が
必要がない場合は関係がない周期にしてもさしつ
かえがない。さらに本発明を発展させた場合とし
て、隣接トラツク毎にウオブリングの位相か、深
さ変調の位相を反転させると、１本のトラツクに
固定する場合やとなりのトラツクにジヤンプする
時に便利になる。この場合は、トラツクを弁別で
きる信号をどこかに入れておくのがよい。 Although some embodiments of the present invention have been described above, the repetition length may be an integral multiple of the synchronization, or if synchronization is not required, the cycle may be unrelated. As a further development of the present invention, inverting the phase of wobbling or the phase of depth modulation for each adjacent track is useful when fixing to one track or when jumping to an adjacent track. In this case, it is best to include a signal somewhere that can distinguish between tracks.
本発明によれば、プリウオブリングの位相弁別
用信号をトラツクの深さ変調によつて記録したの
で情報信号や案内トラツクを制限することなく、
信頼性の高いパイロツト信号を再生できる。
According to the present invention, since the pre-wobble phase discrimination signal is recorded by track depth modulation, the information signal and the guide track are not restricted.
A highly reliable pilot signal can be regenerated.
第１図は、本発明の一実施例の構成を示す図、
第２図ａは本発明に用いる記録担体の断面図、第
２図ｂ〜ｇは、本発明の動作を説明するための波
形図、第３図ａ〜ｄは、本発明に用いる記録担体
の他の実施例を示す図である。
FIG. 1 is a diagram showing the configuration of an embodiment of the present invention,
FIG. 2a is a cross-sectional view of the record carrier used in the present invention, FIGS. 2b to 2g are waveform diagrams for explaining the operation of the present invention, and FIGS. It is a figure which shows another Example.
Claims (1)
沿つて記録又は／及び再生される記録担体であつ
て、該トラツクをその形成方向と直角方向に一定
の周期で微小振動すると共に、該微小振動に同期
して該トラツクの深さを異なる少なくとも２つの
領域に分けて記録したことを特徴とする記録担
体。 ２ 特許請求の範囲第１項記載の記録担体におい
て、上記トラツクが、上記光ビームの波長の1/4
より浅い光学的深さの領域と1/4より深い光学的
深さの領域を有することを特徴とする記録担体。 ３ 記録担体に光ビームを照射して、情報を該記
録担体のトラツクに沿つて記録又は／及び再生す
る情報処理装置において、該トラツクをその形成
方向と直角方向に一定の周期で微小振動すると共
に、該微小振動に同期して該トラツクの深さを異
なる少なくとも２つの領域に分けて記録した記録
担体を用いると共に、該記録担体からの反射光を
電気信号に変換する２分割光検出器と、該２分割
光検出器の差出力を微分した信号と該２分割光検
出器の和出力とを掛算して該トラツクの深さ変調
に関する信号をとり出す手段と、該手段の出力を
用いて該２分割光検出器の和出力に含まれる該微
小振動に関する信号を同期検波する検波手段とを
有し、該検波出力により該光ビームの照射位置を
制御することを特徴とする情報処理装置。[Scope of Claims] 1. A record carrier on which information is recorded and/or reproduced along a track by an irradiated light beam, which vibrates minutely at a constant period in a direction perpendicular to the direction in which the track is formed. A record carrier characterized in that the depth of the track is recorded in at least two different regions in synchronization with the minute vibration. 2. The record carrier according to claim 1, wherein the track has a wavelength of 1/4 of the wavelength of the light beam.
A record carrier characterized in that it has an area of shallower optical depth and an area of optical depth greater than 1/4. 3. In an information processing device that records and/or reproduces information along a track of a record carrier by irradiating a light beam onto a record carrier, the track is minutely vibrated at a constant period in a direction perpendicular to the direction in which the track is formed, and , a two-split photodetector that uses a record carrier in which the track is recorded in at least two different depths in synchronization with the minute vibrations, and that converts reflected light from the record carrier into an electrical signal; means for multiplying the signal obtained by differentiating the difference output of the two-split photodetector by the sum output of the two-split photodetector to obtain a signal related to the depth modulation of the track; An information processing device comprising: a detection means for synchronously detecting a signal related to the minute vibration included in the sum output of a two-split photodetector, and controlling an irradiation position of the light beam based on the detection output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60010861A JPS60167129A (en) | 1985-01-25 | 1985-01-25 | Recording carrier and information processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60010861A JPS60167129A (en) | 1985-01-25 | 1985-01-25 | Recording carrier and information processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60167129A JPS60167129A (en) | 1985-08-30 |
| JPS6360447B2 true JPS6360447B2 (en) | 1988-11-24 |
Family
ID=11762134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60010861A Granted JPS60167129A (en) | 1985-01-25 | 1985-01-25 | Recording carrier and information processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60167129A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5377178A (en) * | 1991-10-11 | 1994-12-27 | Hitachi, Ltd. | Data recording/reproducing method and apparatus using a recording medium having clock marks recorded in a wobbled track for read/write synchronization |
| EP1950750B1 (en) * | 1999-06-30 | 2009-08-12 | Sharp Kabushiki Kaisha | Optical disc device for reproducing an optical disc having pits of different depth formed therein |
| JP2009266285A (en) * | 2008-04-23 | 2009-11-12 | Sony Corp | Optical information recording device, optical information recording method, optical information reproduction device, optical information reproduction method, and optical information recording medium |
-
1985
- 1985-01-25 JP JP60010861A patent/JPS60167129A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60167129A (en) | 1985-08-30 |
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