JPH11134712A - Optical disk and the optical disk manufacturing mold - Google Patents

Optical disk and the optical disk manufacturing mold

Info

Publication number
JPH11134712A
JPH11134712A JP10119525A JP11952598A JPH11134712A JP H11134712 A JPH11134712 A JP H11134712A JP 10119525 A JP10119525 A JP 10119525A JP 11952598 A JP11952598 A JP 11952598A JP H11134712 A JPH11134712 A JP H11134712A
Authority
JP
Japan
Prior art keywords
optical disk
thickness
mold
outer peripheral
peripheral side
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
Application number
JP10119525A
Other languages
Japanese (ja)
Inventor
Heiryu Kichi
炳龍 吉
Myong-Do Ro
明道 盧
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics 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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of JPH11134712A publication Critical patent/JPH11134712A/en
Pending legal-status Critical Current

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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve strength on an outer peripheral side position at a manufacturing time and to obtain clear finishing of an information pit shape by gradually thickening an optical disk having prescribed information with many information pits in its thickness according to from the outer peripheral side toward a central part. SOLUTION: The optical disk 30 is formed so that the thickness d1 of the outer peripheral side is smaller than the thickness d2 of the central part, and the thickness becomes thick gradually according to from the outer peripheral side toward the central part. At this time, the surface recorded with the information pits is formed to a plane, and its opposite surface is tilted, and the thickness of the optical disk 30 is changed is preferred so that deformation isn't added to the information pit shape. Although the thickness d1, d2 are set considering the basic standard of the optical disk, the outer peripheral side thickness d1 is made smaller by 50 μm extent than 0.6 mm for the optical disk of the whole thickness 0.6 mm, and the central part thickness d2 is made larger by 50 μm extent than 0.6 mm is preferred.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、多数の情報ピット
により所定の情報を有する光ディスク及びその光ディス
クの製造のための光ディスク製造金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having predetermined information by a large number of information pits and an optical disk manufacturing die for manufacturing the optical disk.

【０００２】[0002]

【従来の技術】ＣＤやＤＶＤのような光ディスクは、図
１に概略的に示したように一側面に対して所定の深さで
形成された多数の情報ピット１１を有する。その情報ピ
ット１１により光ディスク１０は所定の情報を有し、そ
の情報は記録再生装置内の光ピックアップユニットによ
り照射されるレーザービームを通じて再生できる。2. Description of the Related Art An optical disk such as a CD or a DVD has a large number of information pits 11 formed at a predetermined depth on one side as schematically shown in FIG. The information pits 11 cause the optical disk 10 to have predetermined information, and the information can be reproduced through a laser beam irradiated by an optical pickup unit in the recording / reproducing apparatus.

【０００３】前述した光ディスク１０は、例えば図２に
示したような光ディスク製造金型２０内で射出成形され
る。この光ディスク製造金型２０は、成形装置（図示せ
ず）内に固定される第１金型２１と、第１金型２１に対
して接近及び離隔可能に設けられる第２金型２２とを具
備する。第１金型２１は、前述した光ディスク１０の情
報ピット１１を形成するための多数の微細な突起（図示
せず）を有するスタンパ２１１を含む。第２金型２２が
第１金型２１に対して接近してその第２金型２２が第１
金型２１のスタンパ２１１に密着すると、第２金型２２
と第１金型２１のスタンパ２１１との間には、光ディス
ク１０が成形されるキャビティ２３が形成される。第１
金型２１には前記キャビティ２３内への樹脂の流入のた
めのスプルー２１２が備えられ、そのスプルー２１２は
第２金型２２と第１金型２１のスタンパ２１１の密着に
より形成されるゲート２４により前記キャビティ２３と
通じる。The optical disk 10 described above is injection-molded in an optical disk manufacturing mold 20 as shown in FIG. 2, for example. The optical disc manufacturing mold 20 includes a first mold 21 fixed in a molding device (not shown), and a second mold 22 provided to be able to approach and separate from the first mold 21. I do. The first mold 21 includes a stamper 211 having a number of fine projections (not shown) for forming the information pits 11 of the optical disk 10 described above. The second mold 22 approaches the first mold 21 and the second mold 22
When it comes into close contact with the stamper 211 of the mold 21, the second mold 22
A cavity 23 for molding the optical disk 10 is formed between the mold 21 and the stamper 211 of the first mold 21. First
The mold 21 is provided with a sprue 212 for flowing resin into the cavity 23. The sprue 212 is formed by a gate 24 formed by the close contact between the second mold 22 and the stamper 211 of the first mold 21. It communicates with the cavity 23.

【０００４】前記光ディスク製造金型２０により光ディ
スク１０を製造する過程について簡単に説明すると次の
通りである。まず、図２に示したように第１金型２１と
第２金型２２が密着した状態で、スプルー２１２及びゲ
ート２４を通じて前記キャビティ２３内に溶融樹脂を充
填させた後、所定時間経過するとそのキャビティ２３内
に充填された樹脂が硬化する。樹脂が硬化すると、図３
に示したように第２金型２２を第１金型２１から離隔し
て、前記硬化した樹脂１５を製造金型２０から分離させ
る。その後、前記キャビティ２３内で硬化した樹脂１５
を図４に示したようにゲート２４内で硬化した樹脂１９
から分離させることによって光ディスク１０が得られ、
その光ディスク１０は前記第１金型２１のスタンパ２１
２に形成された突起と同じパターンの情報ピットを有す
る。一方、前述したように光ディスク１０の成形のため
に前記製造金型２０のキャビティ２３内へ樹脂を注入さ
せる時、溶融樹脂が流入される途中にも硬化するので樹
脂を速かに前記キャビティ２３内に均一に充填させる必
要がある。The process of manufacturing the optical disk 10 using the optical disk manufacturing mold 20 will be briefly described as follows. First, as shown in FIG. 2, in a state where the first mold 21 and the second mold 22 are in close contact with each other, the cavity 23 is filled with the molten resin through the sprue 212 and the gate 24. The resin filled in the cavity 23 is cured. When the resin cures, Figure 3
As shown in (2), the second mold 22 is separated from the first mold 21 to separate the cured resin 15 from the production mold 20. Then, the resin 15 cured in the cavity 23
Is cured in the gate 24 as shown in FIG.
The optical disk 10 is obtained by separating
The optical disk 10 is a stamper 21 of the first mold 21.
2 has information pits in the same pattern as the projections formed in the projections. On the other hand, as described above, when the resin is injected into the cavity 23 of the manufacturing die 20 for molding the optical disc 10, the resin is hardened even during the flow of the molten resin, so that the resin is quickly injected into the cavity 23. Need to be uniformly filled.

【０００５】ところが、従来の光ディスクはその厚さが
薄いだけでなく、厚さ（両側面間の垂直距離）はその光
ディスクの各部位において互いに同一に設定されてい
る。従って、製造金型内のキャビティでの樹脂の流動性
が良好でなく、樹脂がキャビティの外周側部位に完全に
充填できなかったり、または、充填されてもその部位で
の樹脂密度が低下して所望の機械的強度や情報ピットの
形状が得られない場合が発生する。さらに、最近は記録
密度の向上のために従来１．２mmの厚さの光ディスクよ
りさらに薄い光ディスク、例えば０．６mmの厚さの光デ
ィスクが開発されているが、前述したような構造を有す
ると前記０．６mmの厚さの光ディスクでは前述した問題
点がさらに著しく現れる。However, not only is the conventional optical disk thin, but also the thickness (vertical distance between both side surfaces) is set to be the same at each part of the optical disk. Therefore, the fluidity of the resin in the cavity in the manufacturing mold is not good, and the resin cannot be completely filled in the outer peripheral side portion of the cavity, or the resin density at that portion decreases even if filled. In some cases, the desired mechanical strength and the shape of the information pit cannot be obtained. Further, recently, an optical disk thinner than the conventional optical disk having a thickness of 1.2 mm, for example, an optical disk having a thickness of 0.6 mm has been developed to improve the recording density. The above-mentioned problem appears more remarkably in an optical disk having a thickness of 0.6 mm.

【０００６】[0006]

【発明が解決しようとする課題】本発明はこのような問
題点を解決するために案出されたことであって、製作時
にその外周側部位での強度が向上され、またその外周側
部位の情報ピットの形状がよりはっきりと形成できるよ
うに構造が改善された光ディスクを提供することに目的
がある。SUMMARY OF THE INVENTION The present invention has been devised in order to solve such a problem. The strength of the outer peripheral portion during production is improved, and the outer peripheral portion is improved. It is an object to provide an optical disc having an improved structure so that the shape of information pits can be more clearly formed.

【０００７】本発明の他の目的は、外周側部位の強度が
向上され、その外周側部位の情報ピットの形状がよりは
っきりと形成できるように構造が改善された光ディスク
を製造するための光ディスク製造金型を提供することに
ある。Another object of the present invention is to manufacture an optical disk for manufacturing an optical disk in which the strength of the outer peripheral portion is improved and the structure of the information pit in the outer peripheral portion can be more clearly formed. To provide a mold.

【０００８】[0008]

【課題を解決するための手段】前記の目的を達成するた
めに本発明による光ディスクは、多数の情報ピットによ
る所定の情報を有することにおいて、外周側から中心部
へ行くほど厚さが次第に厚くなる点を特徴とする。In order to achieve the above-mentioned object, an optical disk according to the present invention has predetermined information by a large number of information pits. Features a point.

【０００９】前記の他の目的を達成するために本発明に
よる光ディスク製造金型は、多数の情報ピットによる所
定の情報を有する光ディスクの成形のためにその光ディ
スクに対応されるキャビティを有することにおいて、前
記キャビティは外周側から中心部へ行くほど厚さが次第
に厚くなる点を特徴とする。According to another aspect of the present invention, there is provided a mold for manufacturing an optical disk according to the present invention having a cavity corresponding to the optical disk for molding an optical disk having predetermined information by a large number of information pits. The cavity is characterized in that the thickness gradually increases from the outer periphery toward the center.

【００１０】[0010]

【発明の実施の形態】以下、本発明による望ましい実施
の形態を添付した図面を参照して詳細に説明する。図５
及び図６を参照すると、本実施の形態の光ディスク３０
は、図１を参照して説明した光ディスク１０と同じよう
に、一側面に対して所定の深さで形成された多数の情報
ピット３１を有し、その情報ピット３１により所定の情
報を有し、その情報は光ディスク再生装置内の光ピック
アップ（図示せず）により照射されるレーザービームを
通じて再生できる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG.
Referring to FIG. 6 and FIG.
Has a number of information pits 31 formed at a predetermined depth on one side surface and has predetermined information by the information pits 31 in the same manner as the optical disc 10 described with reference to FIG. The information can be reproduced through a laser beam irradiated by an optical pickup (not shown) in the optical disk reproducing apparatus.

【００１１】一方、本実施の形態の光ディスク３０は、
従来の光ディスク１０とは違い、外周側の厚さｄ１が中
心部の厚さｄ２より小さい、すなわち、外周側から中心
部へ行くほど厚さが次第に厚くなるよう形成された本発
明の特徴を成している。この際、情報ピット３１の形状
に変形が加えられないように、前記情報ピット３１が記
録された面は平面を成し、その反対面を傾斜させること
によって光ディスク３０の厚さを変化させることが望ま
しい。On the other hand, the optical disk 30 of the present embodiment
Unlike the conventional optical disc 10, the present invention is characterized in that the thickness d1 on the outer peripheral side is smaller than the thickness d2 on the central portion, that is, the thickness gradually increases from the outer peripheral side toward the central portion. doing. At this time, the surface on which the information pits 31 are recorded forms a plane, and the thickness of the optical disc 30 can be changed by inclining the opposite surface so that the shape of the information pits 31 is not deformed. desirable.

【００１２】前述した厚さｄ１，ｄ２は、光ディスクの
基本的な規格を勘案して設定できるが、例えば、全体的
な厚さが０．６mmの光ディスクに対しては前記外周側の
厚さｄ１を０．６mmより５０μｍ程度小さく、中心部の
厚さｄ２を０．６mmより５０μｍ程度大きく設定するこ
とが望ましい。The thicknesses d1 and d2 described above can be set in consideration of the basic standard of the optical disk. For example, for an optical disk having an overall thickness of 0.6 mm, the thickness d1 on the outer peripheral side is set. Is preferably set to be smaller than 0.6 mm by about 50 μm, and the thickness d2 of the central portion is set to be larger than 0.6 mm by about 50 μm.

【００１３】前述した光ディスク３０は、例えば図７及
び図８に示したような光ディスク製造金型４０により製
造できる。この製造金型４０は、図２を参照して説明し
た従来の光ディスク製造金型２０と同じように、成形装
置（図示せず）内に固定され、情報ピット３１（図５参
照）を形成するための微細な突起（図示せず）を有する
スタンパ４１１を含む第１金型４１と、第１金型４１に
対して接近及び離隔可能に設置された第２金型４２とを
含む。それから、第２金型４２が第１金型４１に対して
接近して前記スタンパ４１１に密着すると、その第２金
型４２と第１金型４１のスタンパ４１１の間には、前記
光ディスク３０が成形されるキャビティ４３が形成され
る。第１金型４１にはキャビティ４３内への樹脂の流入
のためのスプルー４１２が作られ、そのスプルー４１２
は第１金型４１と第２金型４２の密着により形成される
ゲート４４によりキャビティ４３と通じる。The above-described optical disk 30 can be manufactured by using an optical disk manufacturing mold 40 as shown in FIGS. 7 and 8, for example. The manufacturing die 40 is fixed in a molding device (not shown), and forms information pits 31 (see FIG. 5), similarly to the conventional optical disk manufacturing die 20 described with reference to FIG. A first mold 41 including a stamper 411 having fine projections (not shown) for the first mold 41, and a second mold 42 installed so as to be able to approach and separate from the first mold 41. Then, when the second mold 42 approaches the first mold 41 and comes into close contact with the stamper 411, the optical disc 30 is placed between the second mold 42 and the stamper 411 of the first mold 41. A cavity 43 to be molded is formed. A sprue 412 is formed in the first mold 41 for flowing the resin into the cavity 43.
Is communicated with the cavity 43 by a gate 44 formed by the close contact between the first mold 41 and the second mold 42.

【００１４】一方、本実施の形態の光ディスク製造金型
４０において、第２金型４２と共に前記キャビティ４３
を成す第１金型４１のスタンパ４１１は全体的に平面形
状を成し、第２金型４２はキャビティ４３の外周側から
キャビティ４３の中心部へ行くほど第１金型４１のスタ
ンパ４１１から遠ざかるように傾斜している。従ってキ
ャビティ４３は、その外周側の厚さＤ１が中心部の厚さ
Ｄ２より小さい、すなわち、外周側から中心部へ行くほ
ど厚さが次第に厚くなっている。On the other hand, in the optical disk manufacturing mold 40 of the present embodiment, the cavity 43 is formed together with the second mold 42.
The stamper 411 of the first mold 41 has a planar shape as a whole, and the second mold 42 moves away from the stamper 411 of the first mold 41 as it goes from the outer peripheral side of the cavity 43 to the center of the cavity 43. So inclined. Therefore, the thickness D1 on the outer peripheral side of the cavity 43 is smaller than the thickness D2 at the central portion, that is, the thickness gradually increases from the outer peripheral side toward the central portion.

【００１５】このような光ディスク製造金型４０を使用
して光ディスク３０を得る過程は、従来の光ディスク製
造金型２０により従来の光ディスク１０を得る過程と違
いはない。即ち、図８に示したように第１金型４１と第
２金型４２が密着した状態でスプルー４１２及びゲート
４４を通じて前記キャビティ４３内へ樹脂を注入して充
填させた後、所定時間が経過して樹脂が硬化すると第２
金型４２を第１金型４１から離隔させて硬化した樹脂を
製造金型４０から分離させた後、前記キャビティ４３で
硬化した樹脂からゲート４４の内で硬化した樹脂を分離
させると、そのキャビティ４３と同じ形状の光ディス
ク、即ち本実施の形態の光ディスク３０が得られる。そ
して、その光ディスク３０は前記第１金型４１のスタン
パ４１１に形成された突起と同じパターンの情報ピット
３１を有する。The process of obtaining the optical disk 30 using the optical disk manufacturing die 40 is not different from the process of obtaining the conventional optical disk 10 by the conventional optical disk manufacturing die 20. That is, as shown in FIG. 8, after the resin is injected into the cavity 43 through the sprue 412 and the gate 44 in a state where the first mold 41 and the second mold 42 are in close contact with each other, a predetermined time elapses. When the resin cures, the second
After the mold 42 is separated from the first mold 41 and the cured resin is separated from the production mold 40, the resin cured in the gate 44 is separated from the resin cured in the cavity 43. An optical disk having the same shape as 43, that is, the optical disk 30 of the present embodiment is obtained. The optical disk 30 has information pits 31 having the same pattern as the protrusions formed on the stamper 411 of the first mold 41.

【００１６】[0016]

【発明の効果】本実施の形態の光ディスク製造金型にお
いては、その光ディスクに対応する形状を有するキャビ
ティの厚さが、そのキャビティの外周側から中心部へ行
くほど次第に厚くなるように形成されているので、光デ
ィスク成形のために前記製造金型のキャビティへ樹脂を
注入させる時、溶融樹脂のキャビティ内での樹脂流動性
が従来の製造金型においてより優秀である。従って、溶
融樹脂が前記キャビティの内から外周側部位まで迅速で
完全に充填できるので、その製造金型により製造される
光ディスクはその外周側部位まで均等の機械的強度が得
られるだけでなく、外周側部位まで所望の樹脂密度が維
持できて情報ピットの完全な形状が容易に得られる。本
発明によると、例えば全体的な厚さが０．６mmの薄い光
ディスク及びその光ディスクの製造金型において、前述
した効果がさらに著しい。In the mold for manufacturing an optical disk according to the present embodiment, the thickness of the cavity having a shape corresponding to the optical disk is formed so as to gradually increase from the outer peripheral side to the center of the cavity. Therefore, when a resin is injected into the cavity of the mold for molding an optical disc, the flowability of the molten resin in the cavity is better than that of the conventional mold. Therefore, since the molten resin can be quickly and completely filled from the inside of the cavity to the outer peripheral portion, the optical disk manufactured by the manufacturing mold can not only obtain uniform mechanical strength up to the outer peripheral portion, but also have the outer peripheral portion. The desired resin density can be maintained up to the side portion, and the complete shape of the information pit can be easily obtained. According to the present invention, for example, in a thin optical disk having an overall thickness of 0.6 mm and a mold for manufacturing the optical disk, the above-described effects are more remarkable.

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

【図１】 従来の光ディスクの概略的な斜視図である。FIG. 1 is a schematic perspective view of a conventional optical disc.

【図２】 図１に示した光ディスクを製造するための製
造金型の概略的な断面図である。FIG. 2 is a schematic sectional view of a manufacturing mold for manufacturing the optical disc shown in FIG.

【図３】 図２に示した第１金型と第２金型が分離した
状態を示す概略的な断面図である。FIG. 3 is a schematic sectional view showing a state where a first mold and a second mold shown in FIG. 2 are separated.

【図４】 図２に示した製造金型により光ディスクが得
られる過程を説明するための概略的な図面である。FIG. 4 is a schematic view for explaining a process of obtaining an optical disk by the manufacturing mold shown in FIG.

【図５】 本発明の一実施の形態による光ディスクの概
略的な斜視図である。FIG. 5 is a schematic perspective view of an optical disc according to an embodiment of the present invention.

【図６】 図５に示した光ディスクのＶＩ−ＶＩ線の概
略的な断面図である。6 is a schematic cross-sectional view of the optical disk shown in FIG. 5, taken along the line VI-VI.

【図７】 図５に示した光ディスクの製造のための製造
金型が分離した状態を示す概略的な断面図である。FIG. 7 is a schematic cross-sectional view showing a state where a manufacturing mold for manufacturing the optical disk shown in FIG. 5 is separated.

【図８】 図７に示した製造金型が結合した状態を示す
概略的な断面図である。FIG. 8 is a schematic cross-sectional view showing a state where the manufacturing mold shown in FIG. 7 is combined.

【符号の説明】[Explanation of symbols]

３０ 光ディスク ３１ 情報ピット ４０ 光ディスク製造金型 ４１ 第１金型 ４２ 第２金型 ４３ キャビティ ４１１ スタンパ REFERENCE SIGNS LIST 30 optical disk 31 information pit 40 optical disk manufacturing die 41 first die 42 second die 43 cavity 411 stamper

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 所定の情報を有する多数の情報ピットを
有し、外周側から中心部へ行くほど厚さが次第に厚くな
ることを特徴とする光ディスク。1. An optical disc having a large number of information pits having predetermined information, wherein the thickness gradually increases from the outer peripheral side toward the center. 【請求項２】 中心に最も隣接した部分の厚さは０．６
mmより大きく、中心から最も遠く離れた部分の厚さは
０．６mmより小さいことを特徴とする請求項１に記載の
光ディスク。2. The thickness of the portion closest to the center is 0.6.
2. The optical disc according to claim 1, wherein the thickness of the portion farthest from the center is larger than 0.6 mm. 【請求項３】 多数の情報ピットによって所定の情報を
有する光ディスクの成形のために、その光ディスクに対
応するキャビティを有し、前記キャビティは、外周側か
ら中心部へ行くほど厚さが次第に厚くなることを特徴と
する光ディスク製造金型。3. For forming an optical disk having predetermined information by a large number of information pits, the optical disk has a cavity corresponding to the optical disk, and the cavity gradually increases in thickness from the outer peripheral side toward the center. An optical disk manufacturing mold characterized by the above-mentioned.
JP10119525A 1997-10-28 1998-04-28 Optical disk and the optical disk manufacturing mold Pending JPH11134712A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR199755562 1997-10-28
KR1019970055562A KR19990034081A (en) 1997-10-28 1997-10-28 Optical disc and mold for manufacturing optical disc

Publications (1)

Publication Number Publication Date
JPH11134712A true JPH11134712A (en) 1999-05-21

Family

ID=19523574

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10119525A Pending JPH11134712A (en) 1997-10-28 1998-04-28 Optical disk and the optical disk manufacturing mold

Country Status (3)

Country Link
JP (1) JPH11134712A (en)
KR (1) KR19990034081A (en)
CN (1) CN1215884A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2000236534A1 (en) * 2000-03-27 2001-10-08 Goldsense Laser Av Production Limited A super digital versatile disk and its manufacturing method and die
KR20030065848A (en) * 2002-02-01 2003-08-09 삼성전자주식회사 Disc having slope

Also Published As

Publication number Publication date
KR19990034081A (en) 1999-05-15
CN1215884A (en) 1999-05-05

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