JPS62298949A - Substrate for optical recording medium and method and device for manufacturing it - Google Patents

Substrate for optical recording medium and method and device for manufacturing it

Info

Publication number
JPS62298949A
JPS62298949A JP61143589A JP14358986A JPS62298949A JP S62298949 A JPS62298949 A JP S62298949A JP 61143589 A JP61143589 A JP 61143589A JP 14358986 A JP14358986 A JP 14358986A JP S62298949 A JPS62298949 A JP S62298949A
Authority
JP
Japan
Prior art keywords
spacer
stamper
recording medium
substrate
optical 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.)
Granted
Application number
JP61143589A
Other languages
Japanese (ja)
Other versions
JPH0654553B2 (en
Inventor
Tetsuji Kawakami
哲司 川上
Tetsuo Yokoyama
哲男 横山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kuraray Co Ltd
Original Assignee
Kuraray Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kuraray Co Ltd filed Critical Kuraray Co Ltd
Priority to JP61143589A priority Critical patent/JPH0654553B2/en
Publication of JPS62298949A publication Critical patent/JPS62298949A/en
Publication of JPH0654553B2 publication Critical patent/JPH0654553B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/263Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/263Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • B29C2045/2648Outer peripheral ring constructions

Abstract

PURPOSE:To manufacture a disk, which has a minute surface pattern and has a projection as a spacer, without passing the process for adhesion or the like between the disk and the space by using a mold, which fixes a stamper and has a spacer-shaped recessed part, or a mold, on which the stamper having the spacer-shaped recessed part is placed, to form a substrate for optical recording medium. CONSTITUTION:A mold for injection molding consists of an upper mold part 26, which is provided with a specular surface to form a specular surface 6 of a substrate 1 for optical recording medium as a molded article, and a stamper 21 which is placed on a mold part 27 having a stamper-side plane 17, whose outside diameter is shorter than that of the mold part 26, so that the part of a surface pattern 2 is turned up, and stamper fixing members 23 and 24 which are provided with recessed parts 13 and 14 to form spacer parts and are provided with claws 15 and 16 to fix the stamper surface are attached to the inside peripheral part and the outside peripheral part of the stamper 21 to fix the stamper 21. In this case, the stamper fixing member 24 attached to the outside peripheral part forms the spacer of the substrate and a cavity in the outside end part. It is preferable that the plane 17 of the mold part 27 is a specular surface.

Description

【発明の詳細な説明】 3、発明の詳細な説明 [産業上の利用分野] 本発明はスペーサー付きの先記録媒体用基板支びその製
法並びにその製造のための装置に関する。
Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a substrate support for a recording medium with a spacer, a method for manufacturing the same, and an apparatus for manufacturing the same.

[従来の技術] 情報等としての微細な表面模様を有する光記録媒体はビ
デオディスク、オーディオディスク、データファイルデ
ィスク、イメージファイルディスク等として良く知られ
ている。その構成には複合構造を取るものが多く、代表
的なものにエアーサンドイッチ型がある。このように光
記録媒体を例えばエアーサンドイッチ構造とする大きな
理由は、■当該記録媒体が物理的変形を伴って記録され
変形を妨げるような他の層との接触を防ぐ要求、■情報
記録部分を保護する要求 ■記録媒体の表裏二面より直接再生、場合によっては記
録が可能であるという要求 からである。
[Prior Art] Optical recording media having fine surface patterns for information, etc. are well known as video discs, audio discs, data file discs, image file discs, and the like. Many of them have a composite structure, with the air sandwich type being a typical example. The main reasons why an optical recording medium has an air sandwich structure, for example, are: (1) the recording medium is recorded with physical deformation, and (2) the requirement to prevent contact with other layers that would impede deformation; This is due to the demand for protection: - The need to be able to directly reproduce, and in some cases record, from both the front and back sides of a recording medium.

上記表面に微細な表面模様を有するエアーサンドイッチ
型の光記録媒体は通常、スタンパ−を用いて成形された
二枚の微細な表面模様を有する光記録媒体基板を該表面
模様部分を内側にしてスペーサーを介して積層しエアー
サンドイッチ構造とすることにより作られている。そし
て、該スペーサーは一般に接着剤により接合されている
The above-mentioned air sandwich type optical recording medium having a fine surface pattern on its surface usually has two optical recording medium substrates having a fine surface pattern molded using a stamper, with the surface pattern portion inside, and a spacer. It is made by laminating layers through an air sandwich structure. The spacer is generally bonded with an adhesive.

[発明が解決しようとする問題点J スペーサーを介在さけて二枚の光記録媒体用基板を接着
剤により接合させる場合、偏心なく、二枚の基板及び内
、外周のスペーサーの囲者を接合することは困難であり
、また接着剤塗布及び接着の工程が少なくとも2回必要
であるという問題点かあった。
[Problem to be Solved by the Invention J When two optical recording medium substrates are bonded with an adhesive while avoiding a spacer, the two substrates and the inner and outer spacer surrounds can be bonded without eccentricity. It is difficult to do so, and there is also the problem that the steps of applying the adhesive and adhering are required at least twice.

スペーサーを一体成形した光記録媒体も例えば特開昭6
0−113342号、特開昭60−83241号等によ
り知られている。しかしながら、一般に表面模様を有す
る記録媒体用堰板は該表面模様を決定する肉薄のスタン
パ−を金型表面に載置し外周部を爪により固定した金型
を用いて成形されている。それ故、成形品である基板の
外周表面にスペーサーとなる部分の突起を造ることは出
来なかった。
Optical recording media with integrally molded spacers are also available, for example in JP-A No. 6
It is known from Japanese Patent Application Laid-open No. 0-113342, Japanese Patent Application Laid-Open No. 60-83241, and the like. However, generally, a dam plate for a recording medium having a surface pattern is molded using a mold in which a thin stamper that determines the surface pattern is placed on the surface of the mold, and the outer periphery is fixed with claws. Therefore, it has not been possible to form protrusions to serve as spacers on the outer peripheral surface of the substrate, which is a molded product.

本発明は上述の問題点を解決することを目的とする。The present invention aims to solve the above-mentioned problems.

[問題点を解決するための手段] 本発明者らは上述の問題点を解決すべく鋭意検討をした
結果、スタンパ−を固定する金型自体にスペーサー形状
の窪みを有する金型あるいはスペーサー形状の窪みを有
するスタンパ−を載置した金型を用いて光記録媒体用基
板を成形することにより、内周用スペーサー及び外周用
スペーサーが一体成形されていて、且つ該外周用スペー
サー及び内周用スペーサー間の表面には微細な表面模様
が同様に一体成形により形成された光記録媒体用基板が
得られろことを認めて本発明に至った。
[Means for Solving the Problems] As a result of intensive studies by the present inventors to solve the above-mentioned problems, the present inventors developed a mold having a spacer-shaped recess in the mold itself for fixing the stamper, or a spacer-shaped mold. By molding the optical recording medium substrate using a mold on which a stamper having a recess is placed, the inner circumference spacer and the outer circumference spacer are integrally molded, and the outer circumference spacer and the inner circumference spacer are integrally molded. The present invention was achieved based on the recognition that it would be possible to obtain a substrate for an optical recording medium in which a fine surface pattern was similarly formed by integral molding on the surface between the two.

[実施例J 以下図面を参照しつつ本発明の実施例について説明する
[Embodiment J] An embodiment of the present invention will be described below with reference to the drawings.

第1図は本発明により得られた光記録媒体用基板の一例
を示す断面図である。
FIG. 1 is a sectional view showing an example of an optical recording medium substrate obtained by the present invention.

第1図において微細な表面模様(2)を有する光記録媒
体用基板(1)は内周部及び外周部に夫々突起状のスペ
ーサー(3)及び(4)が一体成形されている。該表面
模様(2)の裏面には鏡面(6)が形成されている。こ
の図において基板は円盤状であるが、方形であることら
できる。
In FIG. 1, an optical recording medium substrate (1) having a fine surface pattern (2) has protruding spacers (3) and (4) integrally molded on the inner and outer peripheral parts, respectively. A mirror surface (6) is formed on the back surface of the surface pattern (2). Although the substrate is disk-shaped in this figure, it can also be rectangular.

第1図において一対の上記基板が突起状のスペーサーの
表面(5)を介して互いに接着又は融着により一体化し
てエアーサンドイッチ型の両面光記録媒体を形成してい
る。本発明の変形例としては、上記基板の片面にスペー
サーを介して表面に金属又はプラスデックの平面仮が接
合されて、片面記録媒体に形成される。
In FIG. 1, the pair of substrates are integrated by adhesion or fusing to each other via the surface (5) of a protruding spacer to form an air sandwich type double-sided optical recording medium. As a modification of the present invention, a flat metal or plastic deck material is bonded to one side of the substrate via a spacer to form a single-sided recording medium.

基板を構成する材料としては、通常の光記録媒体用のプ
ラスチックが用いられる。それらは、例えばポリメチル
メタクリレート、ポリカーボネート、ポリエステル、ポ
リスチレン、ポリ塩化ビニル、エボキン樹脂、フマル酸
樹脂、ポリオレフィン樹脂等である。本発明において微
細な模様(2)はスタンパ−に刻印された情報ピットま
たはトラッキングのための案内溝であることができろ。
As the material constituting the substrate, ordinary plastic for optical recording media is used. These are, for example, polymethyl methacrylate, polycarbonate, polyester, polystyrene, polyvinyl chloride, Evoquin resin, fumaric acid resin, polyolefin resin, etc. In the present invention, the fine pattern (2) may be an information pit engraved on the stamper or a guide groove for tracking.

まfコ該模様は必要に応じその池の任意の微細な模1.
ばであることができろ。ある場合には、該模様は書き込
み型記録媒体において書き込みのための吸収能を高める
ための模様であることができる。
The pattern can be made with any fine pattern of the pond as needed.
Be able to be good. In some cases, the pattern can be a pattern to increase the absorption capacity for writing in a writeable recording medium.

スペーサ一部分の接合は接着剤又は粘着剤による接着を
始めとして、溶剤接着、高周波又は超音波による融着、
機械的組み立て又はこれらの結合など任意の接合方法が
採用される。接着剤としても光硬化型接着剤、ホットメ
ルト型接着剤、味気性接着剤など任意に選択される。
Parts of the spacer can be bonded by bonding with adhesive or adhesive, solvent bonding, fusion by high frequency or ultrasonic waves,
Any method of joining may be employed, such as mechanical assembly or bonding thereof. The adhesive may be arbitrarily selected from photocuring adhesives, hot melt adhesives, flavor adhesives, and the like.

第2図〜第4図は本発明の金型の実施例を示す断面図で
ある。
FIGS. 2 to 4 are cross-sectional views showing embodiments of the mold of the present invention.

第2図において射出成形用の金型は、成形品でめろ光記
録媒体用基板(1)の鏡面(6)を形成するための鏡面
を有した上部金型部分(26)、該金型部分(26)よ
り外径が小さいスタンパ−側の平面(17)を有する金
型部分(27)上に表面模様(2)部分を上にして載置
されたスタンパ−(21)、該スタンパ−(21)の内
周部及び外周部にスペーサ一部を形成する窪み(13)
及び(14)並びにスタンパ−面を固定するための爪(
■5)及び(16)がついたスタンパ−固定部材(23
)及び:24)を取り付はスタンパ−(21)を固定す
る。この場合、外周部スタンバ−固定用部材(24)は
基板のスペーサーと外端部のキャビティーを形成する。
In FIG. 2, a mold for injection molding includes an upper mold portion (26) having a mirror surface for forming a mirror surface (6) of a substrate for optical recording medium (1) in a molded product; A stamper (21) placed with the surface pattern (2) portion facing upward on a mold portion (27) having a flat surface (17) on the stamper side having a smaller outer diameter than the portion (26); Recesses (13) forming part of the spacer on the inner and outer peripheries of (21)
and (14) and a claw for fixing the stamper surface (
■Stamper fixing member (23) with 5) and (16)
) and :24) to fix the stamper (21). In this case, the outer periphery stand bar fixing member (24) forms a spacer of the substrate and a cavity at the outer end.

金型部分(27)の平面(17)は鏡面であることが好
ましい。
Preferably, the plane (17) of the mold part (27) is a mirror surface.

第3図においては、別の金型を示す実施例を示す。この
例では第2図の実施例において、外周部スタンパ−固定
用部材の変形例を説明している。
In FIG. 3, an embodiment showing another mold is shown. In this example, a modification of the outer peripheral stamper fixing member in the embodiment shown in FIG. 2 is explained.

該実施例においては、上部金型(26)に固定された外
周リング(29)とスペーサー固定用部材(24)との
間で基板のスペーサー及び外端部のキャビティーが形成
されている。
In this embodiment, the spacer of the substrate and the cavity at the outer end are formed between the outer ring (29) fixed to the upper mold (26) and the spacer fixing member (24).

第4図においては、更に別の金型を示す実施例が開示さ
れる。この例では第2図の実施例において、外周部スタ
ンパ−固定用部材の代わりに外周リング(29)と下部
の金型部分(27)との間で基板のスペーサー及び外端
部のキャビティーか形成されている。この例において、
スタンパ−は内周の固定用部材(23)により固定され
ている。一般に、内周固定用部材のみによりスタンパ−
を固定したのでは成形に対して十分ではない。従って、
この場合は、スタンパ−を下部面より接着、粘着、磁石
又は真空による吸引等の任意の手段により補助的に固定
することが望まれる。
In FIG. 4, an embodiment showing yet another mold is disclosed. In this example, in place of the outer circumferential stamper fixing member in the embodiment shown in FIG. It is formed. In this example,
The stamper is fixed by a fixing member (23) on the inner circumference. Generally, the stamper is stamped using only the inner circumferential fixing member.
Fixing is not sufficient for molding. Therefore,
In this case, it is desirable to supplementarily fix the stamper from the lower surface by any means such as adhesion, adhesive, magnetism, or vacuum suction.

第5図は、スタンパ−自体にスペーサー形状の窪みを有
する場合である。この図においては、スタンパ−(21
)の外周部のみにスペーサー形状の窪み(14)を有し
ている例であるが、同様に内周部にもスペーサーを形成
することができる。ざらに該窪み(14)は外周リング
との間で形成されていてもよい。該スペーサー形状の窪
みを有するスタンパ−はスタンパ−製造工程において任
意の手段により製造できる。
FIG. 5 shows a case where the stamper itself has a spacer-shaped depression. In this figure, the stamper (21
) has a spacer-shaped recess (14) only on the outer periphery, but it is also possible to form a spacer on the inner periphery as well. Roughly, the depression (14) may be formed between the outer ring and the outer ring. The stamper having the spacer-shaped depression can be manufactured by any means in the stamper manufacturing process.

本発明は一例として挙げられた上記の金型を用いて任意
のプラスチック材料を成形することにより光記録媒体用
基板が得られる。成形方法は射出成形、圧縮成形、プレ
ス成形、射出圧縮成形、反応射出成形、注型重合など自
由に選択できる。得られた基板は公知の方法に従って、
必要に応じ反射膜、保護膜などが付与された後、該基板
をスペーサーを介して公知の積層力、去により積層する
ことにより、エアーサンドイッチ型光記録媒体を得ろこ
とができる。表面模様が情報ビットでない場合、例えば
トラッキングなどの案内溝である場合、任意の記録層を
該情報ビット上に積層することにより、書き込み型光記
録媒体が得られる。
In the present invention, a substrate for an optical recording medium can be obtained by molding any plastic material using the above mold mentioned as an example. The molding method can be freely selected from injection molding, compression molding, press molding, injection compression molding, reaction injection molding, cast polymerization, etc. The obtained substrate was prepared according to a known method.
After applying a reflective film, a protective film, etc. as necessary, the substrates are laminated via a spacer using a known laminating force to obtain an air sandwich type optical recording medium. When the surface pattern is not an information bit, for example, when it is a guide groove for tracking, a writable optical recording medium can be obtained by laminating an arbitrary recording layer on the information bit.

本発明のスペーサーには、金型の形状を任意に選択する
ことにより、該スペーサ一部分に任意の切れ目あるいは
突起を有するディスクを製造することも自由である。該
切れ目あるいは突起を有するディスクはディスク内部と
外部の圧力を調節するための連通孔を形成したり、ある
いはエアーサンドイッチ構造の製造のための接合を嵌合
により容易にする。
By arbitrarily selecting the shape of the mold for the spacer of the present invention, it is possible to manufacture a disk having any cut or protrusion in a portion of the spacer. The disc having the cuts or protrusions forms a communication hole for adjusting the pressure between the inside and outside of the disc, or facilitates joining for manufacturing an air sandwich structure by fitting.

[発明の効果] 本発明に従えば、微細な表面模様を有し、且つスペーサ
ーとしての突起をもつディスクをディスクとスペーサー
との接着等の工程を経ずに製造することかできろ。
[Effects of the Invention] According to the present invention, a disk having a fine surface pattern and projections as spacers can be manufactured without going through a process such as bonding the disk and the spacer.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の光記録媒体の一例を示す断面図であり
、また第2図〜第4図は本発明の金型の一例を示す断面
図、第5図は本発明の本発明スタンパ−を示す断面図で
ある。 ■・・・光記録媒体用基板 2・・・表面模様 3.4・スペーサー 13.14・スペーサー用窪み 15.16・スタンパ−固定用爪 21・・ スタンパ−
FIG. 1 is a sectional view showing an example of an optical recording medium of the invention, FIGS. 2 to 4 are sectional views showing an example of a mold of the invention, and FIG. 5 is a sectional view of an example of a stamper of the invention. It is a sectional view showing -. ■... Optical recording medium substrate 2... Surface pattern 3.4, Spacer 13.14, Spacer recess 15.16, Stamper fixing claw 21... Stamper

Claims (1)

【特許請求の範囲】 1)内周用スペーサー及び外周用スペーサーが一体成形
されている円盤状の基板よりなり、且つ該外周用スペー
サー及び内周用スペーサー間の表面には微細な表面模様
が同様に一体成形により形成されていることを特徴とす
る光記録媒体用基板。 2)該微細な模様が情報ビットである特許請求の範囲第
1項記載の光記録媒体用基板。 3)該微細な模様が案内溝である特許請求の範囲第1項
記載の光記録媒体用基板。 4)一対の上記円盤上の基板がスペーサーを介して互い
に接着又は融着により一体化している光記録媒体用基板
。 5)スタンパーを固定するための爪及びスペーサー形状
の窪みを有するスタンパー固定用部材が装備された光記
録媒の基板製造用金型。 6)スタンパーを固定するための爪及び内周用スペーサ
ー形状の窪みを有するスタンパー固定用部材が装備され
、且つスタンパーが下部面で接着剤、粘着剤、磁石及び
真空による吸引により選択された一種以上の補助的な固
定手段により固定された光記録媒体の基体製造用金型。 7)スペーサー形状の窪みを有する光記録媒体の基体製
造用スタンパー。 8)スタンパーを固定する金型自体にスペーサー形状の
窪みを有する金型あるいはスペーサー形状の窪みを有す
るスタンパーを載置した金型を用いて光記録媒体用基板
を成形することにより、内周用スペーサー及び外周用ス
ペーサーが一体成形されている円盤状の基板よりなり、
且つ該外周用スペーサー及び内周用スペーサー間の表面
には微細な表面模様が同様に一体成形により形成された
光記録媒体用基板の製法。
[Claims] 1) A disk-shaped substrate on which an inner circumferential spacer and an outer circumferential spacer are integrally molded, and the surfaces between the outer circumferential spacer and the inner circumferential spacer have the same fine surface pattern. A substrate for an optical recording medium, characterized in that it is formed by integral molding. 2) The optical recording medium substrate according to claim 1, wherein the fine pattern is an information bit. 3) The optical recording medium substrate according to claim 1, wherein the fine pattern is a guide groove. 4) A substrate for an optical recording medium, in which a pair of the above-mentioned disk-like substrates are integrated by adhesion or fusing to each other via a spacer. 5) A mold for manufacturing a substrate for an optical recording medium, which is equipped with a stamper fixing member having a claw for fixing the stamper and a spacer-shaped recess. 6) Equipped with a stamper fixing member having a claw for fixing the stamper and a recess in the shape of an inner periphery spacer, and the stamper is attached to one or more selected types of adhesives, adhesives, magnets, or vacuum suction on the lower surface. A mold for producing a substrate for an optical recording medium fixed by an auxiliary fixing means. 7) A stamper for manufacturing an optical recording medium substrate having a spacer-shaped depression. 8) By molding an optical recording medium substrate using a mold having a spacer-shaped recess in the mold itself for fixing the stamper or a mold on which a stamper having a spacer-shaped recess is mounted, an inner spacer can be formed. Consists of a disc-shaped substrate on which a spacer for the outer periphery is integrally molded,
and a method for manufacturing an optical recording medium substrate, wherein a fine surface pattern is similarly formed by integral molding on the surface between the outer circumferential spacer and the inner circumferential spacer.
JP61143589A 1986-06-18 1986-06-18 Apparatus for manufacturing substrate for optical recording medium Expired - Lifetime JPH0654553B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61143589A JPH0654553B2 (en) 1986-06-18 1986-06-18 Apparatus for manufacturing substrate for optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61143589A JPH0654553B2 (en) 1986-06-18 1986-06-18 Apparatus for manufacturing substrate for optical recording medium

Publications (2)

Publication Number Publication Date
JPS62298949A true JPS62298949A (en) 1987-12-26
JPH0654553B2 JPH0654553B2 (en) 1994-07-20

Family

ID=15342246

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61143589A Expired - Lifetime JPH0654553B2 (en) 1986-06-18 1986-06-18 Apparatus for manufacturing substrate for optical recording medium

Country Status (1)

Country Link
JP (1) JPH0654553B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0244542A (en) * 1988-08-04 1990-02-14 Matsushita Electric Ind Co Ltd Optical disk and production thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54106204A (en) * 1978-02-07 1979-08-21 Matsushita Electric Ind Co Ltd Information recording disc of transparent type

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54106204A (en) * 1978-02-07 1979-08-21 Matsushita Electric Ind Co Ltd Information recording disc of transparent type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0244542A (en) * 1988-08-04 1990-02-14 Matsushita Electric Ind Co Ltd Optical disk and production thereof

Also Published As

Publication number Publication date
JPH0654553B2 (en) 1994-07-20

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