JPH04238130A - Production of and casting mold for base body for information recording medium - Google Patents
Production of and casting mold for base body for information recording mediumInfo
- Publication number
- JPH04238130A JPH04238130A JP1917391A JP1917391A JPH04238130A JP H04238130 A JPH04238130 A JP H04238130A JP 1917391 A JP1917391 A JP 1917391A JP 1917391 A JP1917391 A JP 1917391A JP H04238130 A JPH04238130 A JP H04238130A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- casting mold
- shape
- shape memory
- information 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
- 238000005266 casting Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000000465 moulding Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000005187 foaming Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000004925 Acrylic resin Substances 0.000 description 6
- 229920000178 Acrylic resin Polymers 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000000178 monomer Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 230000009969 flowable effect Effects 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 239000011346 highly viscous material Substances 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229910004337 Ti-Ni Inorganic materials 0.000 description 1
- 229910011209 Ti—Ni Inorganic materials 0.000 description 1
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Chemical compound CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- -1 transpolyisoprene Polymers 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、情報用ビット、プリフ
ォーマット等の凹凸パターンを有する情報記録媒体用基
体を注型成形法に従って製造する方法、および、その方
法に用いる注型成形型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing information recording medium substrates having uneven patterns such as information bits and preformats according to a cast molding method, and a cast mold used in the method.
【０００２】0002
【従来の技術】従来より、情報記録媒体（特に光学的情
報記録媒体）の製造方法において、情報の書き込み読み
出しの便宜から、あらかじめ基体に一定の間隔で溝（案
内溝）を形成しておくことがよく行われている。そして
、この案内溝部と記録部での反射光量の差を利用すれば
、トラック制御、高速アクセスが可能になる。また、追
記型や書き換え可能型の情報記録媒体においては、あら
かじめ必要な情報をプリフォーマットとして記録するこ
とが行なわれている。[Background Art] Conventionally, in the manufacturing method of information recording media (particularly optical information recording media), grooves (guide grooves) are formed in advance at regular intervals on a substrate for convenience of writing and reading information. is often done. By utilizing the difference in the amount of reflected light between the guide groove portion and the recording portion, track control and high-speed access become possible. Further, in write-once type and rewritable type information recording media, necessary information is recorded in advance as a preformat.
【０００３】この様な情報記録媒体用基体の製造方法の
一つとして、注型成形法がある。この方法は、あらかじ
め型の片側あるいは両側にグルーブが形成されている注
型成形型を用い、この型の中にモノマーまたは溶剤を含
んだプレポリマーを注入し、次いで注入液を硬化させる
ために一定温度まで昇温する成形方法である。[0003] One of the methods for manufacturing such substrates for information recording media is a cast molding method. This method uses a casting mold with grooves pre-formed on one or both sides of the mold, injects a prepolymer containing monomer or solvent into the mold, and then pours a prepolymer containing a monomer or solvent into the mold. This is a molding method in which the temperature is raised to a certain temperature.
【０００４】図２は、従来の注型成形装置を模式的に例
示する断面図である。この成形装置は、スペーサー３を
介して鏡面型１と注型成形型６とが対峙して設けられて
おり、注型成形型６は凹凸形状を一体的に有する。この
中に流動性材料４を注入して硬化させれば、注型成形型
６の凹凸形状に対応する凹凸パターンを有する基体が得
られる。FIG. 2 is a cross-sectional view schematically illustrating a conventional cast molding apparatus. This molding device is provided with a mirror mold 1 and a casting mold 6 facing each other with a spacer 3 in between, and the casting mold 6 integrally has an uneven shape. By injecting the fluid material 4 into this and curing it, a base body having an uneven pattern corresponding to the uneven shape of the cast mold 6 can be obtained.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら従来の注
型成形法においては、粘度の高い流動性材料４を注入す
るとグルーブ部分に気泡が付いてしてしまい、脱気工程
を設けても十分にはこれらを除去できず、基体の凹凸パ
ターンに欠陥が生ずる場合があった。これは、微細かつ
精密なパターン形成が要求される情報記録媒体用基体に
関する特有の課題である。[Problems to be Solved by the Invention] However, in the conventional cast molding method, when a highly viscous fluid material 4 is injected, air bubbles are formed in the groove part, and even if a degassing step is provided, it is not sufficient. In some cases, these cannot be removed, resulting in defects in the uneven pattern of the substrate. This is a unique problem regarding substrates for information recording media that require fine and precise pattern formation.
【０００６】本発明は、この様な課題を解決するために
なされたものであり、その目的は、粘度の高い材料を用
いた場合であっても型のグルーブ部分に気泡が付かず、
微細かつ精密なパターンを有する情報記録媒体用基体を
簡易に製造できる方法、およびこの方法に用いるための
注型成形型を提供することにある。The present invention was made to solve these problems, and its purpose is to prevent air bubbles from forming in the groove portion of the mold even when a highly viscous material is used.
The object of the present invention is to provide a method for easily manufacturing a substrate for an information recording medium having a fine and precise pattern, and a casting mold for use in this method.
【０００７】[0007]
【課題を解決するための手段】本発明は、注型成形によ
り凹凸パターンを有する情報記録媒体用基体を製造する
方法において、該凹凸パターンに対応する形状が記憶さ
れた形状記憶合金または形状記憶樹脂を備える注型成形
型に基板用材料を注入し、加熱することによって該注型
成形型の記憶する形状を具現化する工程を有することを
特徴とする情報記録媒体用基体の製造方法、および、凹
凸パターンを有する情報記録媒体用基体を製造するため
の注型成形型であって、該凹凸パターンに対応する形状
が記憶された形状記憶合金または形状記憶樹脂を備える
ことを特徴とする注型成形型である。[Means for Solving the Problems] The present invention provides a method for producing a substrate for an information recording medium having a concavo-convex pattern by cast molding, in which a shape-memory alloy or a shape-memory resin is memorized with a shape corresponding to the concavo-convex pattern. A method for producing a substrate for an information recording medium, comprising the step of injecting a substrate material into a casting mold and heating it to embody a shape to be memorized by the casting mold, and A cast molding mold for producing a substrate for an information recording medium having an uneven pattern, the casting mold comprising a shape memory alloy or a shape memory resin in which a shape corresponding to the uneven pattern is memorized. It is a type.
【０００８】本発明によれば、流動性材料を注入する時
点では型の形状記憶合金等を気泡が付着し難い形状（平
滑面など）にしておき、注入後の加熱によって記憶する
形状を具現化させるので、気泡の無い状態で良好な成形
が可能となる。According to the present invention, at the time of injecting the flowable material, the shape memory alloy or the like of the mold is made into a shape that makes it difficult for air bubbles to adhere (such as a smooth surface), and the memorized shape is realized by heating after injection. This allows for good molding without bubbles.
【０００９】以下に、本発明の注型成形型を図面を用い
て詳細に説明する。[0009] Below, the casting mold of the present invention will be explained in detail with reference to the drawings.
【００１０】図１は、本発明の注型成形型の一実施態様
を備えた注型成形装置を示す模式的断面図である。注型
成形型５は、形状記憶合金または形状記憶樹脂２を備え
ており、スペーサー３を介して鏡面型１と対峙させて用
いられる。この形状記憶合金等２には、あらかじめ情報
用ビットやプリフォーマット等の必要な凹凸パターンが
記憶されている。そして、注型成形型５は、流動材料４
の注入時は平滑な面形状を有し〔図１（ａ） 〕、一定
温度に加熱することによって記憶された凹凸形状が具現
化される〔図１（ｂ） 〕。FIG. 1 is a schematic sectional view showing a cast molding apparatus equipped with an embodiment of the cast mold of the present invention. The casting mold 5 includes a shape memory alloy or a shape memory resin 2, and is used facing the mirror mold 1 with a spacer 3 interposed therebetween. In this shape memory alloy etc. 2, necessary uneven patterns such as information bits and preformats are stored in advance. Then, the casting mold 5 uses the fluid material 4
When injected, it has a smooth surface shape [FIG. 1(a)], and by heating it to a constant temperature, the memorized uneven shape is realized [FIG. 1(b)].
【００１１】平滑な形状記憶合金２は、例えば、凹凸形
状を記憶させてから平滑なローラーによって引き伸ばす
等の方法で平滑化したものを用いることができる。[0011] The smooth shape memory alloy 2 can be made by, for example, memorizing the uneven shape and then smoothing it by a method such as stretching it with a smooth roller.
【００１２】形状記憶合金２の材質としては、例えば、
Ｔｉ−Ｎｉ合金、Ｃｕ−Ａｌ−Ｘ合金（Ｘはハロゲン原
子を表わす）などを挙げることができる。一方、形状記
憶樹脂２としては、例えば、ポリノルボルネン、トラン
スポリイソプレン、スチレンブタジエン共重合体などを
挙げることができる。[0012] Examples of the material of the shape memory alloy 2 include:
Examples include Ti-Ni alloy and Cu-Al-X alloy (X represents a halogen atom). On the other hand, examples of the shape memory resin 2 include polynorbornene, transpolyisoprene, and styrene-butadiene copolymer.
【００１３】注型成形型５のその他の部位や鏡面型１な
どは、本発明において特に限定は無く、従来より用いら
れる種々のものが使用可能である。また、本発明の注型
成形型は図１に示される態様に限定されず、該凹凸パタ
ーンに対応する形状が記憶された形状記憶合金または形
状記憶樹脂を備える型であればよい。例えば、注型成形
型５の形状記憶合金等２以外の部分（本体）は金属やガ
ラス等で構成し、形状記憶合金等２の変形を妨害しない
様に、本体に部分的に固定または支持して構成すること
ができる。The other parts of the casting mold 5 and the mirror mold 1 are not particularly limited in the present invention, and various conventionally used parts can be used. Furthermore, the casting mold of the present invention is not limited to the embodiment shown in FIG. 1, but may be any mold that includes a shape memory alloy or shape memory resin in which a shape corresponding to the concavo-convex pattern is memorized. For example, the part (main body) of the casting mold 5 other than the shape memory alloy etc. 2 is made of metal, glass, etc., and is partially fixed or supported by the main body so as not to interfere with the deformation of the shape memory alloy etc. 2. It can be configured as follows.
【００１４】次に、本発明の製造方法について詳細に説
明する。Next, the manufacturing method of the present invention will be explained in detail.
【００１５】まず、図１（ａ） に示す様に、形状記憶
合金等２が平滑面の状態の時に流動性材料４を注入する
。この様に平滑面の状態で注入すれば、液状材料４の粘
度が高くても気泡が付着し難く、注入をスムーズに行な
うことができる。この注入時の温度は形状記憶合金等２
の記憶形状が現われない温度であればよいが、通常は常
温である。First, as shown in FIG. 1(a), a flowable material 4 is injected into the shape memory alloy 2 when the surface is smooth. If the liquid material 4 is injected with a smooth surface as described above, even if the liquid material 4 has a high viscosity, air bubbles will not easily adhere to it, and the injection can be carried out smoothly. The temperature during this injection is such as shape memory alloy 2
The temperature may be any temperature at which the memorized shape does not appear, but it is usually room temperature.
【００１６】また流動性材料４は、情報記録媒体用基体
を構成するための材料を用いればよい。特に、注型成形
法に適するものとして知られる樹脂材料が望ましく、透
明な未硬化の熱硬化性樹脂、熱可塑性樹脂または光硬化
性樹脂など種々のものを用い得る。[0016] The fluid material 4 may be a material for constructing a substrate for an information recording medium. In particular, resin materials known to be suitable for cast molding are desirable, and various materials such as transparent uncured thermosetting resins, thermoplastic resins, and photocurable resins can be used.
【００１７】具体的には、例えば、熱硬化性樹脂として
は、フェノール樹脂、エポキシ樹脂、ポリエステル系樹
脂についてのモノマーやプレポリマー等が挙げられる。
また、熱可塑性樹脂としては、ビニル樹脂、スチレン樹
脂、アクリル樹脂、ポリカーボネート樹脂、酢酸セルロ
ース樹脂、ポリエステル系樹脂についてのモノマーやプ
レポリマー等が挙げられる。また、未硬化の光硬化性樹
脂としては、紫外線硬化型樹脂等が用いられ、例えば、
アクリル樹脂、アリル樹脂、ビニル樹脂、エポキシ樹脂
についてのモノマーやプレポリマー等が挙げられる。Specifically, examples of thermosetting resins include monomers and prepolymers for phenol resins, epoxy resins, and polyester resins. Examples of thermoplastic resins include monomers and prepolymers for vinyl resins, styrene resins, acrylic resins, polycarbonate resins, cellulose acetate resins, and polyester resins. Further, as the uncured photocurable resin, ultraviolet curable resin etc. are used, for example,
Examples include monomers and prepolymers for acrylic resins, allyl resins, vinyl resins, and epoxy resins.
【００１８】本発明の製造方法においては、流動性材料
４が硬化する前に形状記憶合金等２の記憶形状が具現化
する必要がある。従って、より簡易な工程（連続的工程
、加熱手段の単一化）とするためには、形状記憶合金等
２の記憶形状が具現化する温度域を、流動性材料４が硬
化する温度域よりも低く設定すればよい。換言すれば形
状記憶合金等２としては、その記憶形状が具現化する温
度域が材料４の熱変形温度から硬化温度の間のものを選
択して用いればよい。In the manufacturing method of the present invention, the memorized shape of the shape memory alloy 2 needs to be realized before the fluid material 4 hardens. Therefore, in order to make the process simpler (continuous process, unification of heating means), the temperature range in which the memorized shape of the shape memory alloy 2 is realized is lower than the temperature range in which the fluid material 4 hardens. You can also set it low. In other words, as the shape memory alloy 2, one may be selected and used whose temperature range in which the memory shape is realized is between the heat deformation temperature of the material 4 and the hardening temperature.
【００１９】例えば、材料４としてメチルメタクリレー
ト（重合温度 １３０℃）を用いる際には、形状記憶合
金２としては、Ｃｕ：３０ａｔ％ 、Ｎｉ：２０ａｔ％
、Ｔｉ：１ａｔ％ （熱変形温度８５℃）の合金を用
いると好適である。For example, when methyl methacrylate (polymerization temperature 130° C.) is used as the material 4, the shape memory alloy 2 contains Cu: 30 at% and Ni: 20 at%.
, Ti: 1 at% (heat distortion temperature: 85° C.) is preferably used.
【００２０】また、本発明の製造方法を、注型成形法以
外の、例えばインジェクション法、熱プレス法、２Ｐ法
などと比較すると、基体内部の残留応力や分子配向が少
ないので基体のソリや光学的異方性が生じ難いなどの点
でも優れている。Furthermore, when the manufacturing method of the present invention is compared with methods other than cast molding methods, such as injection method, hot press method, and 2P method, it is found that residual stress and molecular orientation inside the substrate are small, so warping of the substrate and optical It is also excellent in that it does not easily cause optical anisotropy.
【００２１】[0021]
【実施例】以下、実施例により本発明を更に詳細に説明
する。
実施例１
形状記憶合金２として、Ｃｕ：３０ａｔ％ 、Ｎｉ：２
０ａｔ％、Ｔｉ：１ａｔ％ の組成で、熱変形温度（逆
変態温度）が８５℃のものを準備した。この合金２に、
巾５μｍ、深さ０．５μｍ、ピッチ１５μｍの案内溝、
および巾５μｍ、長さ５μｍ、深さ０．５ μｍの情報
用ピットから成るプリフォーマットの凹凸パターンに対
応する形状をあらかじめ記憶させておき、その後平滑な
ローラーなどで引き伸ばし、平滑な平板状の形状記憶合
金２とした。そして、この形状記憶合金２をニッケル金
属板上に設けて注型成形型５とした。[Examples] The present invention will be explained in more detail with reference to Examples below. Example 1 Shape memory alloy 2: Cu: 30 at%, Ni: 2
A material having a composition of 0 at%, Ti: 1 at%, and a heat distortion temperature (reverse transformation temperature) of 85° C. was prepared. In this alloy 2,
Guide grooves with a width of 5 μm, a depth of 0.5 μm, and a pitch of 15 μm,
A shape corresponding to a preformatted concavo-convex pattern consisting of information pits with a width of 5 μm, a length of 5 μm, and a depth of 0.5 μm is stored in advance, and then stretched with a smooth roller to form a smooth flat plate-like shape. Memory alloy 2 was used. Then, this shape memory alloy 2 was provided on a nickel metal plate to form a casting mold 5.
【００２２】この注型成形型５を、スペーサ３を介して
鏡面研磨されたニッケル金属板（鏡面型１）と対向して
組立てることにより注型成形装置を得た。A cast molding device was obtained by assembling this cast mold 5 so as to face a mirror-polished nickel metal plate (mirror mold 1) with a spacer 3 interposed therebetween.
【００２３】この注型成形装置内に、流動性材料４とし
て、以下の配合組成の液状アクリル樹脂を注入した。
（配合組成）
メタクリル酸メチル
７０重量部 メタクリル酸ターシャリブチ
ル
２５重量部 ポリエチレングリコー
ルジメタクリレート（平均分子量 ６２０） ５重
量部この液状アクリル樹脂の注入時において、形状記憶
合金２の平滑面には気泡が生成しなかった。[0023] A liquid acrylic resin having the following composition was injected into the cast molding apparatus as the fluid material 4. (Composition) Methyl methacrylate
70 parts by weight tert-butyl methacrylate
25 parts by weight Polyethylene glycol dimethacrylate (average molecular weight 620) 5 parts by weight No bubbles were generated on the smooth surface of shape memory alloy 2 when this liquid acrylic resin was injected.
【００２４】注入後加熱すると、その昇温過程の８０℃
付近において形状記憶合金２が形状回復し、図１（ｂ）
に示す様に所望の凹凸形状に変形した。その後、１３
５ ℃、６時間加熱し、次いで室温に降温し、離型して
アクリル樹脂製の情報記録媒体用基体を得た。[0024] When heated after injection, the temperature rises to 80°C.
The shape memory alloy 2 recovers its shape in the vicinity, as shown in Fig. 1(b).
It was deformed into the desired uneven shape as shown in the figure. After that, 13
The mixture was heated at 5° C. for 6 hours, then cooled to room temperature, and released from the mold to obtain an acrylic resin substrate for an information recording medium.
【００２５】この基体の凹凸パターンを目視にて検査し
たところ、気泡による欠陥は全く認められなかった。
比較例１
金属板（Ｆｅ、Ｃｏ、Ｎｉ等）をエッチングすることに
よって、図２に示すような凹凸形状を一体的に有する注
型成形型６であって、実施例１の凹凸形状と同じサイズ
の凹凸形状を有する型６を作製した。When the uneven pattern of this substrate was visually inspected, no defects due to air bubbles were observed. Comparative Example 1 A casting mold 6 that integrally has an uneven shape as shown in FIG. 2 by etching a metal plate (Fe, Co, Ni, etc.), the same size as the uneven shape of Example 1. A mold 6 having a concavo-convex shape was produced.
【００２６】この注型成形型６を用いた以外は実施例１
と同様にして注型成形装置を組み立て、同じ液状アクリ
ル樹脂４を注入し、情報記録媒体用基体を得た。Example 1 except that this casting mold 6 was used.
A cast molding apparatus was assembled in the same manner as above, and the same liquid acrylic resin 4 was injected to obtain a substrate for an information recording medium.
【００２７】この基体を約 １００個製造して、その凹
凸パターンを目視にて検査したところ、気泡による欠陥
が有るものが全体のうちの１０％にも達していた。Approximately 100 of these substrates were manufactured and their uneven patterns were visually inspected, and it was found that as many as 10% of the substrates had defects due to air bubbles.
【００２８】[0028]
【発明の効果】以上説明したように本発明によれば、粘
度の高い材料を用いた場合であっても型のグルーブ部分
に気泡が付かず、微細かつ精密なパターンを有する情報
記録媒体用基体を簡易に製造できる。Effects of the Invention As explained above, according to the present invention, even when a highly viscous material is used, air bubbles do not form in the groove portion of the mold, and a substrate for an information recording medium having a fine and precise pattern can be obtained. can be easily manufactured.
【図１】本発明の注型成形型の一実施態様を備えた注型
成形装置を示す模式的断面図であり、（ａ） は材料注
入時の成形型の状態を、（ｂ） は加熱硬化時の成形型
の状態を表わす。FIG. 1 is a schematic sectional view showing a cast molding apparatus equipped with an embodiment of the cast mold of the present invention, in which (a) shows the state of the mold during material injection, and (b) shows the state of the mold during heating. Represents the state of the mold during curing.
【図２】従来の注型成形装置を模式的に例示する断面図
である。FIG. 2 is a cross-sectional view schematically illustrating a conventional cast molding apparatus.
１ 鏡面型
２ 形状記憶合金または形状記憶樹脂３ スペーサ
ー
４ 流動性材料
５ 注型成形型
６ 従来の注型成形型1 Mirror surface mold 2 Shape memory alloy or shape memory resin 3 Spacer 4 Fluid material 5 Casting mold 6 Conventional casting mold
Claims (2)
情報記録媒体用基体を製造する方法において、該凹凸パ
ターンに対応する形状が記憶された形状記憶合金または
形状記憶樹脂を備える注型成形型に基板用材料を注入し
、加熱することによって該注型成形型の記憶する形状を
具現化する工程を有することを特徴とする情報記録媒体
用基体の製造方法。1. A method for producing a substrate for an information recording medium having a concavo-convex pattern by cast molding, in which a substrate is placed in a cast molding mold comprising a shape memory alloy or a shape memory resin in which a shape corresponding to the concavo-convex pattern is memorized. 1. A method for producing a substrate for an information recording medium, the method comprising the step of injecting a material and heating it to realize the shape to be memorized by the casting mold.
基体を製造するための注型成形型であって、該凹凸パタ
ーンに対応する形状が記憶された形状記憶合金または形
状記憶樹脂を備えることを特徴とする注型成形型。2. A casting mold for producing a substrate for an information recording medium having a concavo-convex pattern, characterized by comprising a shape memory alloy or shape memory resin in which a shape corresponding to the concavo-convex pattern is memorized. Casting mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1917391A JPH04238130A (en) | 1991-01-21 | 1991-01-21 | Production of and casting mold for base body for information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1917391A JPH04238130A (en) | 1991-01-21 | 1991-01-21 | Production of and casting mold for base body for information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04238130A true JPH04238130A (en) | 1992-08-26 |
Family
ID=11991962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1917391A Pending JPH04238130A (en) | 1991-01-21 | 1991-01-21 | Production of and casting mold for base body for information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04238130A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7632628B2 (en) * | 2003-04-18 | 2009-12-15 | Pioneer Corporation | Stamper and method for production thereof |
| US7998605B2 (en) | 2005-09-28 | 2011-08-16 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic recording medium and method for production thereof |
-
1991
- 1991-01-21 JP JP1917391A patent/JPH04238130A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7632628B2 (en) * | 2003-04-18 | 2009-12-15 | Pioneer Corporation | Stamper and method for production thereof |
| US7998605B2 (en) | 2005-09-28 | 2011-08-16 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic recording medium and method for production thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH04238130A (en) | Production of and casting mold for base body for information recording medium | |
| US5026510A (en) | Mold for cast molding substrate having preformat with information pits and method of using same | |
| JP2003501776A (en) | Optical disk mold tool to reduce edge wedge | |
| JPS62135334A (en) | Method and apparatus for preparing disk substrate for recording optical information | |
| JPH01206007A (en) | Manufacture of board for information recording medium | |
| JPH01235606A (en) | Method for manufacturing substrate for information recording media | |
| US5080945A (en) | Large-capacity-memory disk | |
| JPH0254447A (en) | Production of substrate for optical recording medium | |
| JPH04372741A (en) | Production of 2p substrate of both side type | |
| JPS63225536A (en) | Production of substrate for optical disk | |
| JPH01275019A (en) | Manufacture of board for information recording medium | |
| JP2005267746A (en) | Method of manufacturing optical disk substrate | |
| JPH02198808A (en) | Method for preparing substrate for data recording medium and apparatus for cast-molding of said substrate | |
| JPS60173735A (en) | Manufacture of optical disk | |
| JPS60173738A (en) | Manufacture of optical disk | |
| JPS63160035A (en) | Production of optical disk substrate | |
| JPS6399932A (en) | Manufacture of base for optical disk | |
| JP2526091B2 (en) | Casting mold and method for manufacturing substrate for information recording medium using the same | |
| JPH02128337A (en) | Production of substrate for optical information recording medium | |
| JPH01171819A (en) | Mold for cast molding and manufacture of base for information recording mediums using said mold | |
| JPH04229215A (en) | Manufacture of sheetlike molded body and mold to be used therefor | |
| JPS63205833A (en) | Production of optical disk substrate | |
| JPH0211318A (en) | Production of optical disc base | |
| JPH0850737A (en) | Board for optical recording medium | |
| JPH01171816A (en) | Manufacture of base for information recording mediums |