JPS60243835A - Optical recording carrier - Google Patents
Optical recording carrierInfo
- Publication number
- JPS60243835A JPS60243835A JP59099010A JP9901084A JPS60243835A JP S60243835 A JPS60243835 A JP S60243835A JP 59099010 A JP59099010 A JP 59099010A JP 9901084 A JP9901084 A JP 9901084A JP S60243835 A JPS60243835 A JP S60243835A
- Authority
- JP
- Japan
- Prior art keywords
- film
- layer
- rubber
- resin
- recording
- 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
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
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
- G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24318—Non-metallic elements
- G11B2007/2432—Oxygen
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B7/2572—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials
- G11B7/2575—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials resins
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
本発明は光学用記録担体円盤の保護膜に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a protective film for an optical record carrier disk.
従来例の構成とその問題点
ｘ工 ｍ；曽７４−１ ／ ＃ Ｔ１１． ｙｔｊ ｍ
８ ’Ｉ：ｌ 鳳１１８ Ｍ ｍ ＪＩ＝ Ｉｆｆよ
り、光学用記録担体（ＤＲＡＷディスク）が注目されて
いる。しかし、前記光学用記録担体が真に普及するため
には、解決すべき問題も多い。その一つとして記録担体
の寿命が問題である。記録担体が公文書保存用ディスク
（いわゆる文書ファイル）として用いられるだめには、
通常環境で少なくとも１０年以上の寿命が要求される。Configuration of conventional example and its problems ytj m
8 'I:l Otori 118 M m JI= From Iff, optical record carriers (DRAW disks) are attracting attention. However, in order for the optical record carrier to become truly popular, there are many problems that need to be solved. One of the problems is the lifespan of the record carrier. In order for the record carrier to be used as an archive storage disk (so-called document file),
It is required to have a lifespan of at least 10 years under normal conditions.
この寿命を確保するため、各所で種々の工夫がなされて
いる。この−例を第１図にＡ −Ａ’断面を第２図に示
す。この例の場合通常エアーギャップ構成と呼ばれるも
のであり、アクリル、ガラス、ポリカーボネイト基板１
上にＴｅ もしくはＴｅ系合金、有機物等からなる記録
薄膜３が付着されている。この記録担体を第２図のごと
く内面で対向させ、記録ゾーンとして必要でない最外周
、最内周ゾーンで金属等からなるリング２をかませ、デ
ィスク内に空洞４を構成する。このような構造を作るこ
とにより、空洞４は外気と完全に遮断されているから記
録膜３も外気から遮断され、記録膜の長寿命什充Ｍｔ−
，七スへ１禍、１ ？の殉侃卿Ａ糾−如チム表されてい
る記録膜に穴をあけ信号を記録する記録膜（例えばＴｏ
−８ｅ、 ＴｅＣ、等の材料）の場合は昇華された膜を
飛散させるために必需部であるが、我々が有しているＴ
ｅｏｘ （Ｔ ｅｏ２とＴｏ との混合物）の熱黒化
材料を記録膜とする場合飛散物質は存在しないので、こ
のような空洞は必要としない。又、このエアーギャップ
方式では空洞４の熱変形が心配されるとか、全体にディ
スクが大型になるという欠点を有している。一方前述し
たごとく、我々が有する熱黒化材料の場合、当然第３図
（−）、（ｂ）に示されるごく簡単なディスク構造が許
される。（ａ）は片面記録の場合であり、又Ｒ１０ディ
スクとしてはコンパクトディスクがすでにこの構造を持
つ商品として広く市場に供給されている。申）は両面記
録の場合であり、記録膜３があい対して樹脂６で接着さ
れている。（−）の場合、樹脂層６が保護層となってい
る。このようなディスク構造は第１図のエアーギャップ
方式より小型化が可能であり、かつディスク構造が簡単
であるのでコストダウンが図れるという長所がある。し
かし、我々はこの構造を有するディスクの耐候性を詳細
に検討した結果、この構造特有の欠点が存在することが
明らかとなった。In order to ensure this lifespan, various efforts have been made in various places. An example of this is shown in FIG. 1, and a cross section taken along line A-A' is shown in FIG. 2. This example is usually called an air-gap configuration, and consists of acrylic, glass, and polycarbonate substrates.
A recording thin film 3 made of Te, Te-based alloy, organic material, etc. is attached thereon. As shown in FIG. 2, the inner surfaces of the record carriers are opposed to each other, and rings 2 made of metal or the like are fitted in the outermost and innermost zones that are not required as recording zones, thereby forming a cavity 4 within the disk. By creating such a structure, the cavity 4 is completely cut off from the outside air, and the recording film 3 is also cut off from the outside air, ensuring a long service life of the recording film.
, 1 calamity to the 7th, 1 ? A recording film for recording signals (for example, To
-8e, TeC, etc.), it is necessary to scatter the sublimated film, but the T
When a thermally blackened material of eox (a mixture of T eo2 and To 2 ) is used as a recording film, there are no scattered substances, so such a cavity is not required. Furthermore, this air gap method has drawbacks such as the risk of thermal deformation of the cavity 4 and the overall size of the disk. On the other hand, as mentioned above, in the case of the thermally blackened material that we have, the extremely simple disk structure shown in FIGS. 3(-) and 3(b) is of course allowed. (a) shows the case of single-sided recording, and compact discs as R10 discs are already widely supplied on the market as products with this structure. 2) is a case of double-sided recording, in which the recording film 3 is bonded to the opposite side with resin 6. In the case of (-), the resin layer 6 is a protective layer. This type of disk structure has the advantage that it can be made smaller than the air gap method shown in FIG. 1, and that costs can be reduced because the disk structure is simple. However, as a result of a detailed study of the weather resistance of a disk with this structure, we found that there are drawbacks specific to this structure.
我々の検討によると、この構造のディスクを７０Ｔ：９
０％という苛酷な条件から室温にもどすという耐候サイ
クルをおこなった場合、記録膜３と有機保護膜６がバイ
メタル的に動作をし、記録膜３を基板１から剥離させる
力として作用することが明確となった。この力のため、
最悪の樹脂系（アクリル系）を選定した場合、この保護
コート膜６が存在しない方が寿命という点ではまだまし
という結果となってしまう。一方この記録膜と同等の熱
膨張膜を保護層として製作しようとした場合、無機質で
なければならないから、保護層としての必要厚さ （１
５μｍ以上）を確保しようとすると、スパッターや蒸着
による長時間のプロセスを経ねばならない。According to our study, a disk with this structure is 70T:9.
It is clear that when a weathering cycle is carried out in which the temperature is returned to room temperature from the harsh conditions of 0%, the recording film 3 and the organic protective film 6 act like a bimetal, acting as a force that causes the recording film 3 to separate from the substrate 1. It became. Because of this power,
If the worst resin type (acrylic type) is selected, the result will be that the life will be better if this protective coat film 6 does not exist. On the other hand, if we try to manufacture a thermally expandable film equivalent to this recording film as a protective layer, it must be inorganic, so the required thickness of the protective layer (1
5 μm or more), it is necessary to go through a long process using sputtering or vapor deposition.
発明の目的
本発明は以上に述べた欠点を克服し、従来の有機膜保護
コートと同様、スピンコードが可能であシかつ、この保
護膜により、バイメタル効果が発生しない保護膜布する
光学記録担体を提供せんとするものである。OBJECTS OF THE INVENTION The present invention overcomes the above-mentioned drawbacks and provides an optical recording carrier that can be spin-coded in the same manner as conventional organic protective coatings and that prevents bimetallic effects from occurring due to this protective coating. We aim to provide the following.
発明の構成
本発明は基板と、この基板上にレーザー光の熱により記
録層の反射率もしくは透過率を変化させることにより情
報を記録する記録層を有し、この記録層の上面にゴム系
樹脂を保護膜として設けた光学記録担体である。Structure of the Invention The present invention has a substrate and a recording layer on the substrate that records information by changing the reflectance or transmittance of the recording layer by heat of laser light, and a rubber-based resin on the upper surface of the recording layer. This is an optical record carrier provided with a protective film.
実施例の説明
本発明の特徴は、応力歪を吸収しやすく、小さなりフグ
率を持つ、ゴム状物質を保護コート材として用いること
にある。さてこのような材質を保護コートとして用いた
場合、前述した耐候性熱サイクルを加えたとき、保護膜
のゴム状物質によって応力歪はほとんどが、ゴム弾性に
よって吸収される。DESCRIPTION OF THE EMBODIMENTS The present invention is characterized by the use of a rubber-like material as a protective coating material, which easily absorbs stress and strain and has a small puffiness ratio. Now, when such a material is used as a protective coat, when the above-mentioned weather resistance heat cycle is applied, most of the stress strain is absorbed by the rubbery material of the protective film due to its rubber elasticity.
したがって記録膜３と基板１との間に発生する応力は通
常の弾性係数を有する有機膜を用いた場合が弱まること
によシ記録膜３と基板１との密着性が耐候テストサイク
ル後も十分保存されるので膜の寿命が非常に伸びるよう
Ｋなる。以下具体的に実施した一例第４図にもとづいて
詳細な説明を加える。Therefore, the stress generated between the recording film 3 and the substrate 1 is weakened when an organic film having a normal elastic modulus is used, so that the adhesion between the recording film 3 and the substrate 1 is sufficient even after the weather test cycle. Since it is preserved, the lifespan of the membrane is greatly extended. A detailed explanation will be given below based on FIG. 4 of a concrete example.
我々が実験に用いたゴム状樹脂はシリコーンゴムであり
このゴムは常温３０分で自然乾燥タイプのものを用いた
。（−例の商品としては信越化学製液状シリコン、Ｒ，
Ｔ、Ｖゴム、ＫＥ３４７５等が使用可能）まずポリカー
ボネイト等の基板１にＴ ｅｏｘ膜３を蒸着法又はスパ
ッター法を用いて形成する。この後、約１００ ｃｐｓ
程度のシリコンゴム溶液を約１ｏＯｏ〜２００ Ｏｒｐ
ｍで回転するターンテーブル上に置かれた上記ディスク
膜面に点下し、シリコンゴムを膜面上に均一コートをす
る。The rubbery resin we used in our experiments was silicone rubber, and this rubber was of the type that dried naturally at room temperature for 30 minutes. (-Example products include Shin-Etsu Chemical's liquid silicone, R,
(T, V rubber, KE3475, etc. can be used) First, a Teox film 3 is formed on a substrate 1 made of polycarbonate or the like using a vapor deposition method or a sputtering method. After this, about 100 cps
About 1oOo~200Orp of silicone rubber solution
A dot is applied to the surface of the disk film placed on a turntable rotating at m, to uniformly coat the film surface with silicone rubber.
この後、デシケータ−中に３０分はど放置することによ
り厚さ１０〜２０μｍ程度のシリコーンゴム薄膜７が形
成される。原理的にはこれで十分温度サイクルには耐え
ると思われるが、シリコンゴ耐候性サイクルに耐えさせ
るため、吸湿性及び透湿性の低いアクリル系樹脂層６を
シリコーンゴム薄層７の上に形成することにした。この
場合も、約１００ｃｐｓの溶液を用いてシリコーン膜上
に約２０μｍ程度の膜を形成した。なおシリコーン膜は
一般的に密着度が良くないのでシリコーン膜形成時前に
何らかのカップリング材をＴｅＯｘ膜に塗布しておくほ
うが良い。又シリコーン膜上にアクリル系樹脂をコー
トする時も前もってカップリング材を用いた方が良い。Thereafter, a thin silicone rubber film 7 having a thickness of about 10 to 20 μm is formed by leaving it in a desiccator for 30 minutes. In principle, this seems to be sufficient to withstand temperature cycles, but in order to withstand silicone rubber weathering cycles, an acrylic resin layer 6 with low hygroscopicity and moisture permeability is formed on the silicone rubber thin layer 7. I made it. In this case as well, a film of about 20 μm was formed on the silicone film using a solution of about 100 cps. Note that silicone films generally do not have good adhesion, so it is better to apply some kind of coupling material to the TeOx film before forming the silicone film. Also, acrylic resin is coated on the silicone film.
It is better to use coupling material in advance when connecting.
以上の条件によって製作されたディスクを７０℃９０％
と、常温常湿との間の耐候性テストサイクルを加えた。Discs manufactured under the above conditions were heated at 70℃90%.
and a weather resistance test cycle between normal temperature and humidity.
このようなディスク構造を有するディスクは、７０℃９
０ｃＩｂの一定環境下で１０００ｈτ、膜質に変化を与
えることなく、保存することが可能となり、従来構造の
第３図ａに対して約１０倍の寿命を持たせることが可能
となった。A disk with such a disk structure is heated to 70℃9
It has become possible to store the film for 1000 hτ under a constant environment of 0cIb without changing the film quality, and it has become possible to have a lifespan approximately 10 times longer than that of the conventional structure shown in FIG. 3a.
しかし、シリコーン系ゴムは一般的に密着性が悪く、シ
リコーン面で剥離が起こる場合が多い。However, silicone rubber generally has poor adhesion, and peeling often occurs on the silicone surface.
そこで我々は第６図に示されるディスク構造を検討した
。まず記録膜は実際センター穴６付近８及び最外周部９
は付着されていない。そこでシリコーンゴムがその部分
にもともと付着しないようにするか、あるいは、付着後
削り取ることによりポリカーボネイトあるいは、アクリ
ル基板を露出させておく。この後前述したようにカップ
リング材を塗布後、アクリル系、又はエポキシ系樹脂層
６をスピンコードによシ形成する。このような構造を有
することにより、センタ一部付近８もしくは外周部付近
９により基板１と裏打ち樹脂層６が密着するのでシリコ
ーンゴムの密着性が弱いという点は改善され又、従来通
り、ＴｅＯｘ膜３はゴム系樹脂７に密着されているから
応力はすべてゴム系樹脂に吸収される。Therefore, we investigated the disk structure shown in FIG. First of all, the recording film is actually around the center hole 6 8 and the outermost periphery 9
is not attached. Therefore, the polycarbonate or acrylic substrate is exposed by preventing the silicone rubber from adhering to that part, or by scraping it off after adhesion. Thereafter, as described above, after applying the coupling material, an acrylic or epoxy resin layer 6 is formed using a spin cord. With such a structure, the substrate 1 and the backing resin layer 6 come into close contact with each other near the center part 8 or around the outer periphery 9, which improves the weak adhesion of silicone rubber. 3 is in close contact with the rubber resin 7, so all stress is absorbed by the rubber resin.
発明の効果
以上のように本発明によれば従来のエアーサンドイッチ
構造にくらべて、組立精度はそれほど必要とされないし
、スピン法等の生産性の高い手法が使用出来るという効
果がある。また、第５図のディスク構造を有する光記録
担体は、すべてのものが７０℃９０％１０００ ｈｒ
の耐候性試験をパスすることが可能であった０Effects of the Invention As described above, the present invention has the advantage that, compared to the conventional air sandwich structure, assembling precision is not required as much and highly productive methods such as the spin method can be used. Furthermore, all optical record carriers having the disk structure shown in FIG.
It was possible to pass the weather resistance test of 0
第１図は従来例におけるエアーギャップ式光記録担体の
上面図、第２図は第１図のＡ −Ａ／断面図、第３図（
−）、（ｂ）はそれぞれ従来例における光記録担体の断
正面図、第４図、第５図はそれぞれ本発明の実施例にお
ける光記録担体の断正面図である。
１・・・・基板、３・・・・・記録薄膜、６・・・・・
・アクリル系樹脂層、７・・・・シリコーンゴム薄層。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図FIG. 1 is a top view of a conventional air-gap optical record carrier, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
-) and (b) are respectively sectional front views of optical record carriers in conventional examples, and FIGS. 4 and 5 are sectional front views of optical record carriers in embodiments of the present invention, respectively. 1...Substrate, 3...Recording thin film, 6...
- Acrylic resin layer, 7... silicone rubber thin layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (3)
率もしくは透過率を変化させることにより情報を記録す
る記録層とを有し、この記録層の上面にゴム系樹脂を保
護層として設けた光学用記録担体。(1) It has a substrate and a recording layer on this substrate that records information by changing the reflectance or transmittance by the heat of laser light, and a rubber-based resin is provided as a protective layer on the upper surface of this recording layer. optical record carrier.
特許請求の範囲第１項記載の光学用記録担体。(2) The optical record carrier according to claim 1, wherein the rubber-based resin can be spin-coded.
び透湿性の少ない樹脂層もしくは金属層を形成した特許
請求の範囲第１項記載の光学記録担体。(3) The optical record carrier according to claim 1, wherein a resin layer or a metal layer with low hygroscopicity and moisture permeability is formed on top of the rubber-based resin layer forming the protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59099010A JPS60243835A (en) | 1984-05-17 | 1984-05-17 | Optical recording carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59099010A JPS60243835A (en) | 1984-05-17 | 1984-05-17 | Optical recording carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60243835A true JPS60243835A (en) | 1985-12-03 |
Family
ID=14235113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59099010A Pending JPS60243835A (en) | 1984-05-17 | 1984-05-17 | Optical recording carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60243835A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6163942A (en) * | 1984-09-05 | 1986-04-02 | Sanyo Electric Co Ltd | Optical information recording disk |
| JPH01137439A (en) * | 1987-11-23 | 1989-05-30 | Taiyo Yuden Co Ltd | Optical information recording medium |
| JPH01176343A (en) * | 1987-12-30 | 1989-07-12 | Taiyo Yuden Co Ltd | Optical information recording medium |
| EP0419295A2 (en) * | 1989-09-22 | 1991-03-27 | Sharp Kabushiki Kaisha | Optical memory device |
-
1984
- 1984-05-17 JP JP59099010A patent/JPS60243835A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6163942A (en) * | 1984-09-05 | 1986-04-02 | Sanyo Electric Co Ltd | Optical information recording disk |
| JPH01137439A (en) * | 1987-11-23 | 1989-05-30 | Taiyo Yuden Co Ltd | Optical information recording medium |
| JPH01176343A (en) * | 1987-12-30 | 1989-07-12 | Taiyo Yuden Co Ltd | Optical information recording medium |
| JPH0587895B2 (en) * | 1987-12-30 | 1993-12-20 | Taiyo Yuden Kk | |
| EP0419295A2 (en) * | 1989-09-22 | 1991-03-27 | Sharp Kabushiki Kaisha | Optical memory device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4331966A (en) | Information storage device and method of forming same | |
| GB2080598A (en) | Optical data storage and recording medium having a replaceable protective coverplate | |
| JPS60243835A (en) | Optical recording carrier | |
| JPH01287841A (en) | Optical information recording medium | |
| JPH02304734A (en) | Reproduction only optical disk | |
| JPH0379771B2 (en) | ||
| JPH0490146A (en) | Optical information recording medium | |
| JPH01224942A (en) | Information recording medium | |
| JPH0445133Y2 (en) | ||
| JP2519997B2 (en) | Optical recording medium | |
| JP2786626B2 (en) | Manufacturing method of disk-shaped storage medium | |
| JPS5814342A (en) | Production for optical storage element | |
| JPS61217945A (en) | Information recording disk | |
| JPS61217944A (en) | Information recording disk | |
| JPS63152071A (en) | Information recording medium | |
| JPS60197956A (en) | Optical disk | |
| JPS605439A (en) | Disc for optical information carrier | |
| JPS63124238A (en) | Optical disk | |
| JPH0246539A (en) | Optical disk | |
| JPH0447905B2 (en) | ||
| JPH0432041A (en) | Optical disk and production thereof | |
| JPS6464145A (en) | Information carrier disk | |
| JPH06187664A (en) | Optical recording medium | |
| JPS62128036A (en) | Information recording medium | |
| JPH03219439A (en) | Optical recording medium |