JPH01213842A - Rewriting type optical disk medium - Google Patents
Rewriting type optical disk mediumInfo
- Publication number
- JPH01213842A JPH01213842A JP63038594A JP3859488A JPH01213842A JP H01213842 A JPH01213842 A JP H01213842A JP 63038594 A JP63038594 A JP 63038594A JP 3859488 A JP3859488 A JP 3859488A JP H01213842 A JPH01213842 A JP H01213842A
- Authority
- JP
- Japan
- Prior art keywords
- group
- recording layer
- medium
- depth
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 18
- 239000011241 protective layer Substances 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 4
- 238000001771 vacuum deposition Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、レーザビームを照射して、その照射部に光
学的変化を起こさせて記録、消去を行うのに適した書換
型光ディスク媒体に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rewritable optical disk medium suitable for recording and erasing data by irradiating a laser beam and causing an optical change in the irradiated area. It is something.
従来、レーザビームを利用して情報を記録する材料とし
ては、金属膜９色素膜などが用いられているが、これら
は局所的に孔を形成するかまたは変形を起こさせて使用
するため、記録情報の消去は不可能であり、いわゆる追
記型光記憶媒体として用いられている。一方、書換型光
記憶媒体としては、結晶−４非晶質間の転移に伴う反射
率変化を利用する相変化媒体と、Ｉ（ｅｒｒ効果を利用
した光磁気媒体があり、相変化媒体としてはＴｅまたは
Ｓｅをベースにした多元合金系、光磁気媒体としてはＴ
ｂＦｅＣｏを主成分とした多元合金系が研究されている
。Conventionally, metal films9 and dye films have been used as materials for recording information using laser beams, but since these are used by locally forming holes or causing deformation, it is difficult to record information. It is impossible to erase information, and it is used as a so-called write-once optical storage medium. On the other hand, as rewritable optical storage media, there are phase change media that utilizes the change in reflectance associated with the transition between crystalline and amorphous states, and magneto-optical media that utilizes the I(err effect). Multi-component alloy system based on Te or Se, T as a magneto-optical medium
Multi-component alloy systems containing bFeCo as a main component have been studied.
まず、相変化型光記録媒体の記録および消去について説
明する。First, recording and erasing on a phase change optical recording medium will be explained.
記録は大田カシヨードパルスのレーザビームを媒体に照
射することで急加熱し、約１μｍφのスポット状に媒体
を溶融したのち、これを急冷させて結晶状態から非晶質
状態へ転移させることにより行う。そして、消去はロン
グパルスレーザビームの照射で記録部分をアニールし、
より安定な結晶方向の状態へ転穆させることにより行う
。Recording is performed by rapidly heating the medium by irradiating it with an Ota Kassiodo pulsed laser beam, melting the medium into a spot of approximately 1 μm diameter, and then rapidly cooling it to transform from a crystalline state to an amorphous state. . Then, for erasing, the recorded area is annealed by irradiation with a long pulse laser beam.
This is done by turning the crystal orientation to a more stable state.
一方、光磁気媒体では、垂直磁化膜の磁化方向の反転に
よる光学特性の変化（Ｋｅｒｒ効果）を利用しており、
磁化の反転は、静磁場中で媒体膜の一部にレーザビーム
を照射してキュウリ−点景上に加熱することにより行う
。On the other hand, magneto-optical media utilize changes in optical properties (Kerr effect) caused by reversal of the magnetization direction of a perpendicularly magnetized film.
The magnetization is reversed by irradiating a portion of the medium film with a laser beam in a static magnetic field and heating it in a cucumber-like manner.
なお、このような光ディスクには一般に約７０〜６０ｎ
ｍの深さの連続したグループが切ってあり、これはレー
ザビームが各トラックをトレース（トラッキング）する
ために設けられているものである。使用するレーザビー
ムの波長λ（８４０〜７８０ｎｍが一般的）、基板の屈
折率をｎ（はとんどの場合１．５８）とすると、ｄ−ｎ
＝（λ／８）付近が最もトラッキング信号が得られ易く
、この値からはなれると実際にトラッキングができなく
なる。このため、グループの深さは概ねｄ＝：（λ／８
）／ｎ
＝ （８３０ｎｍ／８０／１．５８
＝＋６６ｎｍ
で、７０〜６０ｎｍとなっている。Note that such optical discs generally have a thickness of approximately 70 to 60 nm.
Successive groups of depth m are cut, and this is provided for the laser beam to trace each track. Assuming the wavelength λ of the laser beam used (generally 840 to 780 nm) and the refractive index of the substrate n (1.58 in most cases), d-n
It is easiest to obtain a tracking signal near =(λ/8), and tracking becomes impossible when the value deviates from this value. Therefore, the depth of the group is approximately d=:(λ/8
)/n = (830 nm/80/1.58 = +66 nm, which is 70 to 60 nm.
（発明が解決しようとする課題〕
ところで、記録層、保護層に一般に使われている５ｉｎ
２、記録層に多量に含まれるＴｅ、Ｆｅおよび基板（Ｐ
ＭＭＡ）の熱伝導率は各々下記第１表に示すようになっ
ているが、基板に比べて記録層および保護層の値が４桁
以上大きい。このため、書き込み消去時にレーザビーム
により投入された熱エネルギーは、基板の深さ方向に比
べ横方向へ約１０倍の速度で伝搬する。(Problem to be solved by the invention) By the way, the 5-in.
2. Te, Fe and substrate (P) contained in large amounts in the recording layer
The thermal conductivities of MMA) are shown in Table 1 below, and the values of the recording layer and protective layer are four orders of magnitude higher than that of the substrate. Therefore, the thermal energy applied by the laser beam during writing and erasing propagates in the lateral direction of the substrate at a speed approximately 10 times faster than in the depth direction of the substrate.
第 １ 表
すなわち、書き込み消去は各トラック毎に行うが、ある
トラックについて書き込みあるいは消去パルス光を照射
した時、熱伝導によって隣接トラックも昇温されてしま
うことになる。このため、相変化型では隣接トラック上
の非晶質マークの部分的な結晶化が起こり、また、光磁
気型では隣接トラックの磁化の減少を引き起こして記録
情報に劣化を招く恐れがある。Table 1 That is, writing and erasing is performed for each track, but when a certain track is irradiated with write or erase pulse light, the temperature of the adjacent track will also rise due to heat conduction. For this reason, in the phase change type, partial crystallization of the amorphous mark on the adjacent track occurs, and in the magneto-optical type, the magnetization of the adjacent track may decrease, leading to deterioration of recorded information.
この発明は、前記課題を解決するためになされたもので
、各トラック間の熱的干渉を防止できる書換型光ディス
ク媒体を得ることを目的とする。The present invention was made to solve the above problems, and an object of the present invention is to obtain a rewritable optical disc medium that can prevent thermal interference between tracks.
この発明に係る書替型光ディスク媒体は、グループの深
さを光記録層または透明保護層と光記録層の合計の膜厚
に比べて深く形成して、その側面における光記録層の膜
厚を薄く、あるいは皆無の状態とするとともに、サンプ
リングサーボ用のヴオブリングマークを設けたものであ
る。In the rewritable optical disk medium according to the present invention, the depth of the group is formed to be deeper than the total thickness of the optical recording layer or the transparent protective layer and the optical recording layer, and the thickness of the optical recording layer on the side surface thereof is reduced. It is made thin or non-existent, and has a vobbling mark for sampling servo.
この発明においては、グループ間のランドに記録を行う
場合、隣接トラック方向への熱伝導が低下し、トラック
間の熱的干渉が抑えられる。In this invention, when recording is performed on lands between groups, heat conduction toward adjacent tracks is reduced, and thermal interference between tracks is suppressed.
（実施例〕
第１図および第２図はこの発明の書換型光ディスク媒体
の一実施例を示す図であり、第１図は上面図、第２図は
、第１図のＡ−Ａ線における断面図ある。(Embodiment) FIGS. 1 and 2 are diagrams showing an embodiment of the rewritable optical disk medium of the present invention. FIG. 1 is a top view, and FIG. There is a cross-sectional view.
これらの図において、１はグループで、深さ４００ｎｍ
、幅が上面で６００ｎｍ、底で５００ｎｍである。２は
ランドで、データ記録領域となる。３はミラー領域に形
成されたヴオブリングマークで、深さが１３０ｎｍ、幅
が６００１ｍである。４はプラスチック基板である。５
は厚さ１５０ｎｍのＳｉＯ２保護層、６は厚さ８０ｎｍ
の記録層で、Ｔ ｅ ｓｔ Ｉ ｎ ＋ａＡ ｕ ２５
の組成であり、これらはいずれも真空蒸着により作成し
た。In these figures, 1 is a group with a depth of 400 nm
, the width is 600 nm at the top and 500 nm at the bottom. 2 is a land, which serves as a data recording area. 3 is a wave ring mark formed in the mirror region, and has a depth of 130 nm and a width of 6001 m. 4 is a plastic substrate. 5
is a SiO2 protective layer with a thickness of 150 nm, and 6 is a SiO2 protective layer with a thickness of 80 nm.
With a recording layer of T e st I n +aA u 25
These were all created by vacuum evaporation.
ここで、このグループ１とヴオブリングマーク３の付い
たプラスチック基板４はレーザ光を用いたマスタリング
によって作製した。すなわち、２０ｃｍφのガラス円盤
に膜厚４００ｎｍのポジ型レジストをスピンコードし、
これをターンテーブルに乗せ、一定角速度で回しながら
、レジストに波長４５８ｎｍのアルゴンレザビームをＮ
Ａｏ。Here, the plastic substrate 4 having the group 1 and the wave ring mark 3 was produced by mastering using laser light. That is, a positive resist with a film thickness of 400 nm was spin-coded on a 20 cm diameter glass disk, and
Place this on a turntable and turn it at a constant angular velocity while shining an argon laser beam with a wavelength of 458 nm onto the resist.
Ao.
９のレンズで約５００ｎｍφに集光し、トラックピッチ
１６００ｎｍで露光した。この時、グループ１は充分に
露光し、ヴオブリングマーク３は中間露光とした。これ
により次の現像段階でグループ１とヴオブリングマーク
３の深さのコントロールが可能となった。そして、これ
をマスクにして金型を作り、最後にこの金型を用いて押
し出し成形法によりプラスチック基板４を形成した。The light was focused to approximately 500 nmφ using a No. 9 lens, and exposed at a track pitch of 1600 nm. At this time, Group 1 was fully exposed, and Wobbling Mark 3 was exposed to intermediate exposure. This made it possible to control the depth of Group 1 and Vobbling Mark 3 in the next development step. Then, a mold was made using this as a mask, and finally, a plastic substrate 4 was formed using this mold by extrusion molding.
このようにして得られたプラスチック基板４では、グル
ープ１の深さを形成される媒体のトータル膜厚に比べて
深くでき、かつグループ１の側面が立っているため、指
向性のよい真空蒸着法等でこの上に保護層５と記録層６
を堆積させると、ランド２上に比ベグループ１の側面で
媒体膜厚が非常に薄くなる。このため、各ランド２間が
熱的に絶縁されたことになる。In the plastic substrate 4 obtained in this way, the depth of group 1 can be made greater than the total film thickness of the medium to be formed, and since the side surfaces of group 1 are upright, vacuum evaporation with good directionality is possible. Protective layer 5 and recording layer 6 are placed on top of this.
When deposited, the medium film thickness becomes very thin on the side surface of group 1 on land 2. Therefore, each land 2 is thermally insulated.
すなわち、この発明の書換型光ディスク媒体では書き込
みや消去を行うために特定のトラックにレーザビームを
照射した場合、照射によって生じた熱が隣接するトラッ
クに伝導されにくく、書換えに伴う記録情報の劣化が生
じなくなる。That is, in the rewritable optical disk medium of the present invention, when a laser beam is irradiated to a specific track for writing or erasing, the heat generated by the irradiation is difficult to conduct to adjacent tracks, and the recorded information is not degraded due to rewriting. It will no longer occur.
また、この実施例では２０ｃｍφの同心円ディスクの一
周を１２８０個のセグメントに分割し、この各セグメン
ト内にグループ１を設け、各セグメント間を分けるミラ
ー領域にヴオブリングマーク３を設けているが、このヴ
オブリングマーク３は深いグループ１からは得られない
サンプリングサーボ用のトラッキング信号を得るために
設けたものであって、これにより安定したトラッキング
を行うことが可能になっている。In addition, in this embodiment, one circumference of a 20 cm φ concentric disk is divided into 1280 segments, a group 1 is provided within each segment, and a vob ring mark 3 is provided in the mirror area separating each segment. This tracking mark 3 is provided to obtain a tracking signal for sampling servo that cannot be obtained from the deep group 1, and thereby enables stable tracking.
この発明は以上説明したように、グループの深さを光記
録層または透明保護層と光記録層の合計の膜厚に比べて
深く形成して、その側面における光記録層の膜厚を薄く
、あるいは皆無の状態とするとともに、サンプリングサ
ーボ用のヴオブリングマークを設けたので、グループ間
のランドをデータ記録領域として記録を行えば、各トラ
ック間の熱的干渉が防止され、書換えに伴う記録情報の
劣化が生じなくなるという効果がある。As explained above, this invention forms the depth of the group deeper than the total film thickness of the optical recording layer or the transparent protective layer and the optical recording layer, and reduces the film thickness of the optical recording layer on the side surface thereof. Alternatively, since we have set the state where there is no ring mark at all, and provided a swing mark for sampling servo, if you record on the land between groups as a data recording area, thermal interference between each track will be prevented, and recording caused by rewriting will be prevented. This has the effect of preventing information from deteriorating.
第１図、第２図はこの発明の書換型光ディスク媒体の一
実施例を示す上面図および断面図である。
図中、１はグループ、２はランド、３はヴオブリングマ
ーク、４はプラスチック基板、５は５ｔＯ２保護層、６
は記録層である。
第１図
第２図FIGS. 1 and 2 are a top view and a sectional view showing an embodiment of the rewritable optical disc medium of the present invention. In the figure, 1 is a group, 2 is a land, 3 is a floating mark, 4 is a plastic substrate, 5 is a 5tO2 protective layer, 6
is the recording layer. Figure 1 Figure 2
Claims (1)
たは透明保護層に挟まれた光記録層を有する記録媒体に
おいて、前記グループの深さを前記光記録層または前記
透明保護層と光記録層の合計の膜厚に比べて深く形成し
て、その側面における前記光記録層の膜厚を薄く、ある
いは皆無の状態とするとともに、サンプリングサーボ用
のヴォブリングマークを設けたことを特徴とする書換型
光ディスク媒体。In a recording medium having an optical recording layer sandwiched between an optical recording layer or a transparent protective layer on a transparent substrate on which a plurality of groups are formed, the depth of the group is determined by the depth of the optical recording layer or the transparent protective layer and the optical recording layer. The optical recording layer is formed to be deeper than the total thickness of the layers, and the thickness of the optical recording layer on the side surface thereof is thinner or nonexistent, and a wobbling mark for sampling servo is provided. Rewritable optical disc media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63038594A JPH01213842A (en) | 1988-02-23 | 1988-02-23 | Rewriting type optical disk medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63038594A JPH01213842A (en) | 1988-02-23 | 1988-02-23 | Rewriting type optical disk medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01213842A true JPH01213842A (en) | 1989-08-28 |
Family
ID=12529622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63038594A Pending JPH01213842A (en) | 1988-02-23 | 1988-02-23 | Rewriting type optical disk medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01213842A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01223650A (en) * | 1988-03-01 | 1989-09-06 | Ricoh Co Ltd | Magneto-optical recording medium |
-
1988
- 1988-02-23 JP JP63038594A patent/JPH01213842A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01223650A (en) * | 1988-03-01 | 1989-09-06 | Ricoh Co Ltd | Magneto-optical recording medium |
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