JPS63263644A - Optical recording and reproducing disk - Google Patents
Optical recording and reproducing diskInfo
- Publication number
- JPS63263644A JPS63263644A JP62098913A JP9891387A JPS63263644A JP S63263644 A JPS63263644 A JP S63263644A JP 62098913 A JP62098913 A JP 62098913A JP 9891387 A JP9891387 A JP 9891387A JP S63263644 A JPS63263644 A JP S63263644A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- optical
- reproducing
- optical recording
- size
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 22
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野 ゛本発明は光学
的記録再生ディスク、特に多層の光学的記録再生ディス
クに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical recording/reproducing disc, particularly a multilayer optical recording/reproducing disc.
従来の技術
近年、光学的記録再生ディスクは読みだし専用のコンパ
クトディスクから消去可能な光磁気ディスクまで広く応
用されている。そして、関心は高密度化の方向を向いて
いる。2. Description of the Related Art In recent years, optical recording/reproducing disks have been widely applied, ranging from read-only compact disks to erasable magneto-optical disks. Interest is now in the direction of higher density.
高密度化の方法には短い波長の光を使う方法や記録面を
多層にする方法が考えられる。多層記録時の問題点は他
の面からの干渉である。Possible methods for increasing the density include using light with a short wavelength and creating multiple layers on the recording surface. A problem with multilayer recording is interference from other surfaces.
発明が解決しようとする問題点
多層ディスクでは、記録密度を上げるために記録面間の
距離が小さいことが望ましい。Problems to be Solved by the Invention In multilayer discs, it is desirable that the distance between the recording surfaces be small in order to increase the recording density.
本発明は多層記録時の記録密度を上げるための最小の面
間隔を有する光学的記録再生ディスクを提供する。The present invention provides an optical recording/reproducing disk having a minimum interplanar spacing for increasing the recording density during multilayer recording.
問題点を解決するための手段
上記問題点を解決するために本発明の光学的記録再生デ
ィスクは、光学的に記録再生するディスクのピットの最
小サイズをａ、記録面の光学的間隔をｄとし、
□
ｄ＞１５・ａ ゛
の条件を満足することを特徴とするものである。Means for Solving the Problems In order to solve the above problems, the optical recording/reproducing disc of the present invention has a disc for optically recording/reproducing, in which the minimum pit size is a, and the optical distance between the recording surfaces is d. ,
□ It is characterized by satisfying the condition of d>15・a.
上記の光学的間隔とは、屈折率等の補正をした間隔のこ
とである。The above-mentioned optical spacing is a spacing that has been corrected for refractive index and the like.
作用
本発明は上記した構成によって複数の記録面間の干渉を
実用上問題のないレベルに押さえることが出来る。Function: With the above-described configuration, the present invention can suppress interference between a plurality of recording surfaces to a level that does not pose a practical problem.
実施例
以下本発明の実施例の光学的記録再生ディスクについて
、図面を参照しながら説明する。Embodiments Hereinafter, optical recording/reproducing discs according to embodiments of the present invention will be explained with reference to the drawings.
第１図は本発明の第１の実施例の２層光学的記録再生デ
ィスクの構造を示す概略図である。第１図は２層ディス
クの場合を示しているが、さらに記録層が増えても同様
である。第１図において、１は第１の記録面、２は第２
の記録面、３は第２の記録面の記録ピット、４は第２の
記録面の記録ピント、５は入射光である。また、記録面
間の距離をｄ、記録の最小ビットサイズをａとする。以
上のように構成されたディスクにおいて、信号の再生方
法を説明する。FIG. 1 is a schematic diagram showing the structure of a two-layer optical recording/reproducing disk according to a first embodiment of the present invention. Although FIG. 1 shows the case of a two-layer disc, the same applies even if the number of recording layers is further increased. In FIG. 1, 1 is the first recording surface, 2 is the second recording surface.
3 is a recording pit on the second recording surface, 4 is a recording focus on the second recording surface, and 5 is incident light. Further, let the distance between recording surfaces be d, and the minimum bit size for recording be a. A method for reproducing signals on the disc configured as described above will be explained.
第１図において、入射光５は第２の記録面の記録ピット
上に焦点を結んでいる。この時、第１の記録面の記録ピ
ット３の部分を光が通るため反射光あるいは透過光より
得られる再生信号は第１の記録面の記録ピット３の影響
を受ける。この度合いをエラー率で評価した。第２図は
実施の測定結果の一部を示したものである。曲線２１は
最小ピットサイズａｌ）＜０．５／１ｍ１再生波長（λ
）が１．２μｍの場合であり、曲線２２は最小ビットサ
イズａが０．５μｍ１再生波長（λ）が０．８μｍの場
合であり、曲線２３は最小ピントサイズａが１．０μｍ
、再生波長（λ）が０．８μｍの場合である。横軸に距
Ｍｄの２乗、縦軸にエラー率をとる。第２図から分かる
ように、ｄが小さくなるとある値以下でエラー率が急激
に悪化する。そしてその点は再生波長（λ）に無関係で
あり、はぼ
ｄ ＝１６．３ ・ａ （
１）であることが分かった。なお、この関係はピントの
深さにほとんど無関係であった。In FIG. 1, incident light 5 is focused on recording pits on the second recording surface. At this time, since the light passes through the recording pits 3 on the first recording surface, the reproduced signal obtained from the reflected light or the transmitted light is influenced by the recording pits 3 on the first recording surface. The degree of this was evaluated by the error rate. FIG. 2 shows some of the actual measurement results. Curve 21 shows the minimum pit size al) < 0.5/1 m1 reproduction wavelength (λ
) is 1.2 μm, curve 22 is the case when the minimum bit size a is 0.5 μm1 reproduction wavelength (λ) is 0.8 μm, and curve 23 is the case when the minimum focus size a is 1.0 μm.
, when the reproduction wavelength (λ) is 0.8 μm. The horizontal axis represents the square of the distance Md, and the vertical axis represents the error rate. As can be seen from FIG. 2, as d becomes smaller, the error rate deteriorates rapidly below a certain value. And that point is unrelated to the reproduction wavelength (λ), and d = 16.3 ・a (
1). Note that this relationship was almost unrelated to the depth of focus.
第３図は本発明の第２の実施例の光学的記録再生ディス
クの構造の概略図を示すものである。第３図において、
３１．３２はガラス基盤であり、３３゜３４は各々ガラ
ス基盤３１．３２に蒸着された特殊な非晶質酸化テルル
（Ｔ ｅ Ｏｘ ）系の書き込み可能な記録媒体である
。この記録媒体は約２０ｍｗ〜３ｏ１）−の光で屈折率
が変化する性質を持っている。まず、第１の記録面３３
に記録し、次に第２の記録面３４に記録した後筒２の記
録面３４を再生する。第２の記録面３４からの再生信号
強度は一般に第１の記録面３３からの再生信号より小さ
い、その強度を第１の記録面３３の場合の１／にとする
。第３図の記録面３３、３４の黒い部分は白い部分と屈
折率が異なっていることを示している。記録面間の距−
ｄと最小ピントサイズａとの関係には第２図に見られる
ような折れ点が見られるが強度によりその関係は変化を
受ける。その関係は、
ｄ ＝１８．８ ・Ｊ Ｔ −ａ
（２）−であることが分かつ゛た。FIG. 3 shows a schematic diagram of the structure of an optical recording/reproducing disk according to a second embodiment of the present invention. In Figure 3,
31 and 32 are glass substrates, and 33 and 34 are special amorphous tellurium oxide (T e Ox )-based writable recording media deposited on the glass substrates 31 and 32, respectively. This recording medium has a property that the refractive index changes with light of about 20 mw to 3o1). First, the first recording surface 33
Then, the recording surface 34 of the rear cylinder 2 recorded on the second recording surface 34 is reproduced. The intensity of the reproduction signal from the second recording surface 34 is generally smaller than that of the reproduction signal from the first recording surface 33, and its intensity is set to 1/of that of the first recording surface 33. The black portions of the recording surfaces 33 and 34 in FIG. 3 indicate that the refractive index is different from the white portion. Distance between recording surfaces -
There is a breaking point in the relationship between d and the minimum focus size a as shown in FIG. 2, but the relationship changes depending on the intensity. The relationship is d = 18.8 ・J T −a
(2) It was found that -.
２層以上の多層の場合にも上記の関係が成立する。従っ
て、上記の式により各層間の間隔を決めればよい。The above relationship also holds true in the case of multiple layers of two or more layers. Therefore, the spacing between each layer may be determined using the above formula.
（１）、 （２）式に若干の係数の差があるが、これは
ディスクのピットの性質の差に起因していると考えられ
る。なお、第１の実施例、第２の実施例のどちらの場合
でも折れ点の距離（ｄ）の値より記録面間の距離が多少
小さくても実用上問題はない。There is a slight difference in the coefficients between equations (1) and (2), but this is thought to be due to the difference in the properties of the pits on the disk. In both the first and second embodiments, there is no practical problem even if the distance between the recording surfaces is somewhat smaller than the distance (d) between the bending points.
一般に ｄ〉１５・√（ｋ）・ａ 以上に選ぶとよい。in general d〉15・√(k)・a It is better to choose from the above.
発明の効果
以上のように本発明の光学的記録再生ディスクは光学的
に記録再生するディスクのピットの最小サイズをａ、記
録面の光学的間隔をｄとし、ｄ〉１５・ａの条件を満足
することにより、多層高密度記録を可能にする。Effects of the Invention As described above, the optical recording/reproducing disk of the present invention satisfies the condition that d>15・a, where the minimum pit size of the disk for optically recording and reproducing is a, and the optical distance of the recording surface is d. This enables multilayer high-density recording.
第１図は本発明の第１の実施例の２層光学的記録再生デ
ィスクの構造を示すディスク構造概略図、第２シは第１
図の測定結果を示す測定結果説明図、第３図は本発明の
第２の実施例のディスク構造を示すディスク構造概略図
である。
ｌ・・・・・・第１の記録面１．２・・・・・・第２の
記録面、３・・・・・・第２の記録面の記録ビット、４
・・・・・・第２の記録面の記録ピット、５・・・・・
・入射光。
代理人の氏名 弁理士 中尾敏男 はか１名！−オｌの
ｉ！鎗面
２″′″才２の１ｉ！録命
５−入射光
第２図FIG. 1 is a schematic diagram of the structure of a two-layer optical recording/reproducing disk according to the first embodiment of the present invention;
FIG. 3 is a diagram illustrating the measurement results of the measurement results shown in FIG. 3, and FIG. l...First recording surface 1.2...Second recording surface, 3...Recording bits on the second recording surface, 4
... Recording pit on the second recording surface, 5...
・Incoming light. Name of agent: Patent attorney Toshio Nakao Haka1 person! -Ol's i! Yarimen 2'''' year old 2's 1i! Record 5 - Incident light figure 2
Claims (2)
イズをａ、記録面の光学的間隔をｄとし、ｄ＞１５・ａ の条件を満足することを特徴とする光学的記録再生ディ
スク。(1) An optical recording and reproducing disc characterized in that the minimum pit size of the disc for optically recording and reproducing is a, the optical interval of the recording surface is d, and the condition d>15·a is satisfied.
イズをａ、記録面の光学的間隔をｄ、再生時の記録面間
の再生信号強度比をｋ（ｋ＞１）としｄ＞１５・√（ｋ
）・ａ の条件を満足することを特徴とする特許請求の範囲第（
１）項記載の光学的記録再生ディスク。(2) Let the minimum pit size of a disc for optical recording and reproduction be a, the optical distance between recording surfaces be d, and the reproduction signal intensity ratio between recording surfaces during reproduction be k (k>1), d>15. √(k
)・a Claim No. (
1) The optical recording/reproducing disc described in item 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62098913A JP2701258B2 (en) | 1987-04-22 | 1987-04-22 | optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62098913A JP2701258B2 (en) | 1987-04-22 | 1987-04-22 | optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63263644A true JPS63263644A (en) | 1988-10-31 |
| JP2701258B2 JP2701258B2 (en) | 1998-01-21 |
Family
ID=14232368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62098913A Expired - Lifetime JP2701258B2 (en) | 1987-04-22 | 1987-04-22 | optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2701258B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5756265A (en) * | 1995-06-09 | 1998-05-26 | Matsushita Electric Industrial Co., Ltd. | Multilayer optical disc and method of making same |
| WO2005069284A1 (en) * | 2004-01-14 | 2005-07-28 | Pioneer Corporation | Information recording medium |
| US6990055B1 (en) | 1999-06-22 | 2006-01-24 | Matsushita Electric Industrial Co., Ltd. | Optical disc drive for controlling reproduction of an optical disc having a plurality of data layers |
| US7286153B1 (en) | 1991-10-11 | 2007-10-23 | Hitachi, Ltd. | Three-dimensional recording and reproducing apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047248A (en) * | 1983-08-26 | 1985-03-14 | Hitachi Ltd | Recording medium |
-
1987
- 1987-04-22 JP JP62098913A patent/JP2701258B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047248A (en) * | 1983-08-26 | 1985-03-14 | Hitachi Ltd | Recording medium |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7286153B1 (en) | 1991-10-11 | 2007-10-23 | Hitachi, Ltd. | Three-dimensional recording and reproducing apparatus |
| US7995082B2 (en) | 1991-10-11 | 2011-08-09 | Hitachi, Ltd. | Three-dimensional recording and reproducing apparatus |
| US5756265A (en) * | 1995-06-09 | 1998-05-26 | Matsushita Electric Industrial Co., Ltd. | Multilayer optical disc and method of making same |
| US6990055B1 (en) | 1999-06-22 | 2006-01-24 | Matsushita Electric Industrial Co., Ltd. | Optical disc drive for controlling reproduction of an optical disc having a plurality of data layers |
| US7203155B2 (en) | 1999-06-22 | 2007-04-10 | Matsushita Electric Industrial Co. Ltd. | Optical disc including a plurality of data layers |
| US7522495B2 (en) | 1999-06-22 | 2009-04-21 | Panasonic Corporation | Optical disc including a learning area having first and second regions, and methods for reproducing and recording data on the optical disc |
| USRE41415E1 (en) | 1999-06-22 | 2010-07-06 | Panasonic Corporation | Optical disc including a plurality of data layers |
| US7920459B2 (en) | 1999-06-22 | 2011-04-05 | Panasonic Corporation | Optical disc including a learning area having first and second regions, and methods for reproducing and recording data on the optical disc |
| WO2005069284A1 (en) * | 2004-01-14 | 2005-07-28 | Pioneer Corporation | Information recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2701258B2 (en) | 1998-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
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