JPS60182532A - Metallic mold for reproducing flat plate-shaped information recording carrier - Google Patents
Metallic mold for reproducing flat plate-shaped information recording carrierInfo
- Publication number
- JPS60182532A JPS60182532A JP3990384A JP3990384A JPS60182532A JP S60182532 A JPS60182532 A JP S60182532A JP 3990384 A JP3990384 A JP 3990384A JP 3990384 A JP3990384 A JP 3990384A JP S60182532 A JPS60182532 A JP S60182532A
- Authority
- JP
- Japan
- Prior art keywords
- information recording
- disk
- inorg
- film
- layer
- 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
- 239000000463 material Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims description 3
- 239000011147 inorganic material Substances 0.000 claims description 3
- 239000011368 organic material Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 abstract description 19
- 239000011347 resin Substances 0.000 abstract description 19
- 239000000758 substrate Substances 0.000 abstract description 14
- 229910052759 nickel Inorganic materials 0.000 abstract description 9
- 239000011521 glass Substances 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 238000007747 plating Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 150000004767 nitrides Chemical class 0.000 abstract description 4
- 238000002834 transmittance Methods 0.000 abstract description 4
- 238000004544 sputter deposition Methods 0.000 abstract description 3
- -1 AlN Chemical class 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910001026 inconel Inorganic materials 0.000 abstract description 2
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 abstract description 2
- 238000007740 vapor deposition Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052581 Si3N4 Inorganic materials 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000010076 replication Effects 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910005091 Si3N Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000003362 replicative effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はヒデＡディスク、光ディスク、デジタルオーデ
ィオディスク等を効率良く複製する平板状情報記録担体
複製金型に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat information recording carrier duplication mold for efficiently duplicating Hide A discs, optical discs, digital audio discs, etc.
従来例の構成とその問題点
従来のディスク複製プロセスを第１図、第２図に示して
いる。第１図は原盤記録及びスタンバ−形成工程を示し
、ガラスＷ ’Ｓ １上の）Ａトリジスト２がレーザー
光により露光され、図には示していない現像工程を経て
ニッケルメッキ３が施され、ガラス原盤１から刹ｍ後フ
ォトレジスト２を洗浄して取り除１プばニッケルスタン
パー３′ができ上がる。このニッケルスタンパ−３′を
用いて第２図の転写工程に移る。第２図は紫外線硬化型
樹脂を用いた転写工程の従来例を示し、ニッケルスタン
パ−３′上に紫外線硬化型樹脂４を滴下してその上から
透光性の樹脂又はガラス基板５を押し当て、樹脂４を均
一に広げる。これに水銀灯６で紫外線を照射して樹脂４
を硬化させ、基板５ど其に剥離すれば、複製ディスクが
’＋ｒＩられる。複製ディスクを１ｑようとすれば、以
上のようにその数の多少に拘らず第１図のメッキエ稈が
必要であり、設備コストが高くつき、又少数複製ディス
クが必要な場合にはメッキ時間もかかり、能率の悪いプ
ロセスになる。Conventional configuration and its problems A conventional disk duplication process is shown in FIGS. 1 and 2. Figure 1 shows the master recording and stand bar forming process, in which the A trigist 2 on the glass W'S 1 is exposed to laser light, and after a developing process (not shown), nickel plating 3 is applied to the glass. After cleaning and removing the photoresist 2 from the master 1, a nickel stamper 3' is completed. Using this nickel stamper 3', the transfer process shown in FIG. 2 is carried out. FIG. 2 shows a conventional example of a transfer process using an ultraviolet curable resin, in which an ultraviolet curable resin 4 is dropped onto a nickel stamper 3' and a translucent resin or glass substrate 5 is pressed onto it. , spread the resin 4 evenly. This is irradiated with ultraviolet rays using a mercury lamp 6 and the resin 4
By curing and peeling off the substrate 5, a duplicate disk is obtained. If you want to make 1 q of duplicate disks, the plated culms shown in Figure 1 are required regardless of the number, which increases the equipment cost, and if a small number of duplicate disks are required, the plating time will be shortened. This results in a slow and inefficient process.
発明の目的
本発明は上記従来の欠点を解消覆るものぐ、ディスクの
複製プロセスを簡略化し、メッキ工程なしで複製ディス
クが１ｉノられる一１０レスに用いる複製金型を提供づ
ることを目的と゛する。OBJECTS OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional drawbacks, simplify the disk duplication process, and provide a duplication mold that can be used to make a duplication disk without a plating process.
弁明の（１４成
上記目的を達成リ−るため、本発明の平板状情報記録担
体複製金型は、右磯質又は有機質と無機質の組み合わけ
かう成り表面に情報ｕｉ’ＩＮを右−りる平板状情報記
録担体の前記情報構造側に無機質被膜を設【）たしので
ある。(14) In order to achieve the above object, the flat information recording carrier duplication mold of the present invention has information ui'in on the surface of the plate-shaped information recording carrier duplication mold, which has a combination of organic and inorganic materials. An inorganic coating is provided on the information structure side of the flat information recording carrier.
実施例の説明
以上、本発明の実施例について、図面（第３図、第４図
）に基づいて説明覆る。尚、図中前記従来例ど同−符尼
は同一部（Ａを示し、その詳Ｉｌｌ説明は省略ηる。DESCRIPTION OF EMBODIMENTS In the above, embodiments of the present invention will be described based on the drawings (FIGS. 3 and 4). Incidentally, in the drawings, the same reference numerals as in the conventional example indicate the same parts (A), and detailed explanation thereof will be omitted.
ガラス原盤］］のフＡｌ〜レジス１へを露光現像して（
１１られる表面のレリーフ構造を複製金型として利用号
る。）７１ ｔ−レシストは通常ポジ型レジスト（例え
ばミツプレーン］、△、７−１３！：、０等）が使用さ
れ、ノボラック構造を右している。このままの表面状態
で金型として使用した場合、紫外：’ｊ！硬化型樹脂中
の七ツマー成分により溶けたり、樹脂硬化後フＡトレジ
ストと密着してしまい、剥離不能になり複製ディスクが
とれないとい゛う−・状態になる。Glass master disk]] was exposed and developed from Al to resist 1 (
The relief structure on the surface of the mold is used as a replication mold. )71 T-resist is usually a positive type resist (for example, Mitsuplane], Δ, 7-13!:, 0, etc.) and has a novolak structure. When used as a mold with the surface as it is, UV: 'j! It melts due to the 7-mer component in the curable resin, or adheres closely to the photoresist after the resin hardens, making it impossible to separate and creating a state in which a duplicate disk cannot be removed.
こうした不工合を避けるため、本発明ではフＡ１〜レジ
スト等を用いた樹脂金型に厚さ １００Ａ〜１０００Ａ
の無機質のコーティングを施し、離型性の改善と表面強
化を図り、複製金型として使用可能な状態にする。一般
的に紫外線硬化型樹脂は金属、各種酸化物、窒化物等に
対しては接首しにくい。又、樹脂基板に対しては比較的
接着性を上げることが可能である。こうした照１８！物
をコーディングすることにより、樹脂金型を実現づるこ
とができる。In order to avoid such defects, in the present invention, the thickness of the resin mold using resist etc. is 100A to 1000A.
An inorganic coating is applied to improve mold releasability and strengthen the surface, making it usable as a reproduction mold. In general, UV-curable resins are difficult to attach to metals, various oxides, nitrides, etc. Furthermore, it is possible to relatively improve adhesiveness to a resin substrate. This kind of light 18! By coding objects, resin molds can be realized.
金属としては、魚Ｑ’ｉ ％スパッター等で膜形成可能
な金属、例えばＮｉ 、Ｃｒ、Ｆｃ、Ｃ１ｌ、Ａρ。Examples of metals include metals that can be formed into a film by sputtering or the like, such as Ni, Cr, Fc, C1l, and Aρ.
インコネル等があげられる。酸化物、窒化物としは、例
えばＳｉ ０２ 、Ｓｉ ０，０００２ 。Examples include Inconel. Examples of oxides and nitrides include Si 02 and Si 0,0002.
Ｔｉ ０２ 、Ｉｎ２Ｏ３、／’１２２０３ 、 Ａｊ
２Ｎ。Ti 02 , In2O3, /'12203, Aj
2N.
Ｓｉ３Ｎ＋等をあげることができる。何れも蒸着、スパ
ッター、ブラズ？ ＣＶ ｌ）等により容易に薄膜を形
成し１１Ｖるものである。酸化物、窒化物は透明、もし
くはＷｊんと透明に近いものが多いが、金属コーティン
グの場合でｂ膜厚を！１００Ａ以下にすることにより透
過率を数Ｆ％以」ニーはＦＴ［保りることがでさ・、透
光性スタンバ−として用いることができ、不透明基板に
紫外線硬化型樹脂転写層を形成Ｊ−る場合や、金型側か
ら光を入１３１させる必要がある場合にイｊ効Ｃある。Examples include Si3N+. Is it vapor deposition, sputtering, or brazing? A thin film can be easily formed using CV l) or the like and has a voltage of 11V. Oxides and nitrides are often transparent or close to transparent (Wj), but in the case of metal coatings, the film thickness is b! By setting the transmittance to 100A or less, the transmittance can be maintained at several F% or more.It can be used as a translucent stand bar, and an ultraviolet curable resin transfer layer is formed on an opaque substrate. There is an effect C when it is necessary to enter light from the mold side.
第３図に（う４脂又【よ樹脂と無磯物から成る金型の実
施例を示η。ａは前記第２図に示づ［桿で作成した複製
７”イスクの表面に無機質被膜７を形成したしの一〇あ
る。転写層の樹脂４は紫外線硬化バ１樹脂から成り透明
である。基板５（よ透光性のｌ） Ｍ ＭΔ、ポリカー
ボネー１−、ポリスチレン、ポリ塩化ビニール、カラス
等を用いることができる。１）は万ノス原（反８の」二
にポジ型しジスト１「４９をイＪして、１３す、茗の表
面に無Ｖに質層１０を形成したしのである。記録装置で
記録現像しＩこレジスト）車盤を直接複製の金型としで
用いることがでさ、メッキ工程が不要−Ｃ１小規（英高
楯度の実験、生産には最適である。又、プロレスのサイ
クルを大幅に短縮できる。第３図ａの場合はニッケルス
タンパ−又はｂのプロセスで作成した複製金型より作っ
た複製ディスクを用いて作成したものである。この複製
金型を用いて、ニッケルスタンパ−の代りに第２図のプ
ロセスで複製ディスクを作ることができる。第３図の実
施例の場合、コーティングに金属を用いれば、膜厚を３
００Ｘ程度とすれば透過率約２０％程度が１１１られる
。こうしてできた複製金型はそのものが透光性であるの
で、紫外線硬化型（ｔ（脂を用いてディスクを複］４す
る場合、第４図に示すように、複製金型側から紫外線を
照射して硬化させることができるので基板５としては第
２図に示したような透明基板を用いる必要がなく、種々
の基板を用いた複製ディスクを作ることができる。特に
コンピューターメモリー用等の高）小回転、高安定を目
的としたディスクには基板としてアルミニウム板が用い
られる。不透明ひあるのでガイド１〜ラツクを形成しに
うとり−れば、第４図に示すプロセスにより転写するこ
とが可能である。Figure 3 shows an example of a mold made of a resin and a solid material. There are 10 after forming 7.The resin 4 of the transfer layer is made of ultraviolet curing resin and is transparent.Substrate 5 (highly transparent) M MΔ, polycarbonate 1-, polystyrene, polyvinyl chloride , crow, etc. can be used. 1) Make a positive type of 1000000000000000000 (anti-8's) and cast 100% 49 to 130, and form a layer 10 with no V on the surface of the 130000 This is because the car body (recorded and developed with a recording device) can be used as a mold for direct duplication, and no plating process is required - C1 small size (experimented by Hidetaka Tatedo, for production) It is optimal.Also, it can greatly shorten the wrestling cycle.The case in Figure 3a is made using a nickel stamper or a duplicate disk made from a duplicate mold made by the process in b. Using a replica mold, instead of using a nickel stamper, a replica disk can be made using the process shown in Figure 2.In the case of the example shown in Figure 3, if a metal is used for the coating, the film thickness can be reduced to 3.
If it is set to about 00X, the transmittance will be about 20%. The replication mold made in this way is itself translucent, so when using an ultraviolet curing type (reproducing a disk using oil), as shown in Figure 4, ultraviolet rays are irradiated from the replication mold side. Therefore, it is not necessary to use a transparent substrate as shown in FIG. 2 as the substrate 5, and it is possible to make duplicate disks using various substrates.Especially for computer memory, etc. An aluminum plate is used as a substrate for discs intended for small rotations and high stability.Since it is opaque, if the guide 1 to rack is formed, it can be transferred using the process shown in Figure 4. It is.
発明の効果
以上のＪこうに本発明にＪ：れば、不透明基板を用いて
案内病等の複製を行なう場合には、今迄に述べた透光性
金■！を用いるのが非常に右動である。According to the present invention, the above-mentioned translucent gold is used when replicating a guide disease using an opaque substrate. It is very right-handed to use
又、レジスト原盤、レプリカディスク等を複製金型とし
て使用できるｌこめ、プロセスの効率化、簡略化、高精
度化を図ることができる。In addition, it is possible to use a resist master disk, a replica disk, etc. as a reproduction mold, and it is possible to improve the efficiency, simplification, and high precision of the process.
第１図、第２図は従来例を示し、第１図ａ〜ｄは感光材
を塗１１ｉ シたガラス原盤からニッケルスタンバ−を
製作するプロセスの概略図、第２図ａ〜ｄは紫外線硬化
型樹脂と透明１．４板を用いてディスクをＦｌ製するプ
ロセスの概略図、第３図、第４図は本発明の実施例を示
し、第３図ａ及びｂは夫々ｗ、ｍ質被ｉ９を右する透光
性金型の異なった実茄例の１１４戒図、第４図ａ、ｂは
透光性金型と不透明基板を用いてディスクを複製づるプ
ロセスの概略図である。
４・・・樹脂、５・・・基板、７・・・無我！１被股、
８・・・ガラス原板、９・・・ポジ型しジスト層、１０
・・・無１幾￥′［層代理人 森 本 義 弘
第１図
第２図
第３図
（ａ）
（ｂ）
（ａンFigures 1 and 2 show conventional examples, Figures 1 a to d are schematic diagrams of the process of manufacturing a nickel stump bar from a glass master coated with a photosensitive material, and Figures 2 a to d are ultraviolet curing. A schematic diagram of the process of making a disk using a mold resin and a transparent 1.4 plate, FIGS. 3 and 4 show examples of the present invention, and FIGS. Figures 4a and 4b are schematic diagrams of the process of duplicating a disc using a transparent mold and an opaque substrate. 4...Resin, 5...Substrate, 7...Mugo! 1 crotch,
8... Glass original plate, 9... Positive type resist layer, 10
...No 1 number of yen' [Layer agent Yoshihiro Morimoto
Claims (1)
表面に情報４７４造を有する平板状情報記録１口体の前
記情報（８迄側に無機！１被膜を設けｔ、：平板状情報
記録担体複製金型。 ２、平板状情報記録担体及σ無機質被股を透光性とした
特許請求の範囲第１項記載の平板状情報記録担体複製金
型。 ３、無機質被膜の厚さを１００八から１０００Ａにした
１ＳＩ訂請求の範囲第１１ｆｉ記載の平板状情報記録担
体複製金型。[Claims] 1. The above-mentioned information of a flat plate-like information recording unit consisting of a combination of an organic material or a material and an inorganic material and having information 474 structures on the surface (with an inorganic! 1 coating on the side up to 8) , : Flat information recording carrier duplication mold. 2. Flat information recording carrier duplication mold according to claim 1, in which the flat information recording carrier and the σ inorganic cover are translucent. 3. Inorganic material. A flat information recording carrier duplication mold according to claim 11fi of the 1SI revision, in which the thickness of the coating is 1008 to 1000A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3990384A JPS60182532A (en) | 1984-03-01 | 1984-03-01 | Metallic mold for reproducing flat plate-shaped information recording carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3990384A JPS60182532A (en) | 1984-03-01 | 1984-03-01 | Metallic mold for reproducing flat plate-shaped information recording carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60182532A true JPS60182532A (en) | 1985-09-18 |
Family
ID=12565914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3990384A Pending JPS60182532A (en) | 1984-03-01 | 1984-03-01 | Metallic mold for reproducing flat plate-shaped information recording carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60182532A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5048745A (en) * | 1989-04-26 | 1991-09-17 | Canon Kabushiki Kaisha | Roll stamper for molding substrate used for optical recording medium, process for preparing same, and process for preparing optical recording medium making use of it |
| US5078947A (en) * | 1988-09-30 | 1992-01-07 | Victor Company Of Japan, Ltd. | Method and apparatus for the fabrication of optical record media such as a digital audio disc |
| US5489082A (en) * | 1987-12-28 | 1996-02-06 | Canon Kabushiki Kaisha | Reproducible molding die having a removable cleaning layer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5764345A (en) * | 1980-10-08 | 1982-04-19 | Hitachi Ltd | Manufacture of optical disk |
| JPS5766546A (en) * | 1980-10-08 | 1982-04-22 | Sanyo Electric Co Ltd | Manufacture of replica disk |
-
1984
- 1984-03-01 JP JP3990384A patent/JPS60182532A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5764345A (en) * | 1980-10-08 | 1982-04-19 | Hitachi Ltd | Manufacture of optical disk |
| JPS5766546A (en) * | 1980-10-08 | 1982-04-22 | Sanyo Electric Co Ltd | Manufacture of replica disk |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5489082A (en) * | 1987-12-28 | 1996-02-06 | Canon Kabushiki Kaisha | Reproducible molding die having a removable cleaning layer |
| US5078947A (en) * | 1988-09-30 | 1992-01-07 | Victor Company Of Japan, Ltd. | Method and apparatus for the fabrication of optical record media such as a digital audio disc |
| US5048745A (en) * | 1989-04-26 | 1991-09-17 | Canon Kabushiki Kaisha | Roll stamper for molding substrate used for optical recording medium, process for preparing same, and process for preparing optical recording medium making use of it |
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