JPH0963112A - Multilayered optical recording medium and its production - Google Patents
Multilayered optical recording medium and its productionInfo
- Publication number
- JPH0963112A JPH0963112A JP7220565A JP22056595A JPH0963112A JP H0963112 A JPH0963112 A JP H0963112A JP 7220565 A JP7220565 A JP 7220565A JP 22056595 A JP22056595 A JP 22056595A JP H0963112 A JPH0963112 A JP H0963112A
- Authority
- JP
- Japan
- Prior art keywords
- film
- information recording
- layer
- photo
- transferable
- 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
Links
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、多層光学記録媒体
とその製造方法に係わる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer optical recording medium and its manufacturing method.
【０００２】[0002]
【従来の技術】オーディオ用、ビデオ用そのほかの各種
情報を記録する光学記録媒体として、その記録もしくは
（および）再生を光照射によって行う光ディスク、光カ
ード、光磁気ディスク、相変化光学記録媒体等のＲＯＭ
（Rread Only Memory)型、追記型、書換え型等の光学記
録媒体において、例えばＲＯＭ型においてその情報記録
層にデータ情報、トラッキングサーボ信号等の記録がな
される位相ピット、プリグルーブ等の微細凹凸が、また
追記型、書換え型においてもプリグルーブ等の微細凹凸
の形成がなされる。2. Description of the Related Art As an optical recording medium for recording various kinds of information for audio, video, etc., such as an optical disk, an optical card, a magneto-optical disk, a phase change optical recording medium for recording or / and reproducing the information by light irradiation. ROM
In an optical recording medium of (Rread Only Memory) type, write-once type, rewritable type, etc., for example, in a ROM type, fine ruggedness such as phase pits and pregrooves in which data information, tracking servo signals, etc. are recorded are recorded in the information recording layer Further, also in the write-once type and the rewritable type, fine irregularities such as pregrooves are formed.
【０００３】一方、情報記録の大容量化の要求から、情
報記録層が２層以上重ねて形成された多層光学記録媒体
の実用化の開発が著しい。On the other hand, due to the demand for a large capacity of information recording, the practical development of a multi-layer optical recording medium in which two or more information recording layers are formed in layers is remarkable.
【０００４】図６は、透明の基板１上に、第１および第
２の情報記録層１１および１２が透明中間膜３３を介し
て積層されてなる２層構造の光学記録媒体の概略断面図
を示す。FIG. 6 is a schematic cross-sectional view of an optical recording medium having a two-layer structure in which first and second information recording layers 11 and 12 are laminated on a transparent substrate 1 with a transparent intermediate film 33 interposed therebetween. Show.
【０００５】第１の情報記録層１１は、第１の微細凹凸
２１が例えば基板１とともにポリカーボネート等の透明
樹脂によって射出成形によって形成され、これに例えば
ＳｉＮより成る半透明膜１３が被覆されてなり、第２の
情報記録層２２は、第２の微細凹凸２２が形成され、こ
れにＡｌ蒸着膜等による反射膜１４が形成されてなる。
この第２の情報記録層１２上には、光硬化性樹脂等より
なる保護膜６が形成される。In the first information recording layer 11, the first fine irregularities 21 are formed together with the substrate 1 by injection molding of a transparent resin such as polycarbonate, and a semitransparent film 13 made of, for example, SiN is coated thereon. The second information recording layer 22 is formed with the second fine irregularities 22 and the reflection film 14 made of an Al vapor deposition film or the like is formed thereon.
On the second information recording layer 12, a protective film 6 made of a photocurable resin or the like is formed.
【０００６】この光学記録媒体に対する第１の情報記録
層１１と第２の情報記録層１２とからの情報の読み出し
は、ドライブ装置の簡略化をはかることができるよう
に、また第１および第２の情報記録層１１および１２に
対し連続的にその記録ないしは読み出しを行うことがで
きるように、１組の光学ヘッドによって光学記録媒体の
同一側すなわち基板１側からの光照射によって行うこと
ができるようにすることが望まれる。この同一側からの
第１および第２の情報記録層１１および１２に対する記
録ないしは読み出しは、光学ヘッドからの照射光Ｌを、
図６で実線で示すように、第１の情報記録層１１にフォ
ーカシングさせて、その記録、再生を行い、第２の情報
記録層１２に対しては、光学ヘッドからの照射光Ｌを、
図６で破線で示すように、第１の情報記録層１１にフォ
ーカシングさせて、その記録、再生を行う。この方法に
よる場合、その読み出しないしは再生において、各情報
記録層１１および１２間に干渉が生じることがないよう
にするには、これら情報記録層間の透明中間膜３３の厚
さを、３０〜６０μｍの例えば４０μｍ程度の大なる厚
さに選定することが必要となる。The reading of information from the first information recording layer 11 and the second information recording layer 12 with respect to this optical recording medium enables simplification of the drive device, and the first and second information recording layers. In order that the information recording layers 11 and 12 can be continuously recorded or read, it is possible to perform the irradiation by the light from the same side of the optical recording medium, that is, the substrate 1 side by one set of optical heads. Is desired. Recording or reading from or to the first and second information recording layers 11 and 12 from the same side is performed by using the irradiation light L from the optical head,
As shown by the solid line in FIG. 6, the first information recording layer 11 is focused to perform recording and reproduction, and the second information recording layer 12 is irradiated with the irradiation light L from the optical head.
As indicated by the broken line in FIG. 6, the first information recording layer 11 is focused, and recording / reproducing is performed. According to this method, in order to prevent the information recording layers 11 and 12 from interfering with each other in reading or reproducing, the thickness of the transparent intermediate film 33 between the information recording layers is set to 30 to 60 μm. For example, it is necessary to select a large thickness of about 40 μm.
【０００７】[0007]
【発明が解決しようとする課題】上述した例えば第１及
び第２の情報記録層１１及び１２が積層されてなる多層
光学記録媒体を得る方法としては、第１の情報記録層１
１は、例えば第１の微細凹凸をポリカーボネート樹脂等
の透明樹脂による基板１と共に射出成型によって形成
し、これの上に半透明膜１３を被着形成することによっ
て構成する。As a method of obtaining a multilayer optical recording medium in which the above-mentioned first and second information recording layers 11 and 12 are laminated, for example, the first information recording layer 1 is used.
1 is formed by, for example, forming first fine irregularities together with a substrate 1 made of a transparent resin such as a polycarbonate resin by injection molding, and depositing a semitransparent film 13 thereon.
【０００８】そして、この第１の情報記録層上に透明中
間膜３３と第２の情報記録層１２の第２の微細凹凸２２
とを形成する。この透明中間膜３３と、第２の微細凹凸
の形成方法としては、主として次の２つの方法がある。
第１の方法は転写性光硬化樹脂フィルムいわゆるシート
状ドライフォトポリマーを用いる方法であり、第２の方
法はいわゆる２Ｐ法（Photopolymerization 法）による
方法である。Then, on the first information recording layer, the transparent intermediate film 33 and the second fine unevenness 22 of the second information recording layer 12 are formed.
To form. There are mainly the following two methods for forming the transparent intermediate film 33 and the second fine irregularities.
The first method is a method using a transferable photocurable resin film, so-called sheet-shaped dry photopolymer, and the second method is a method based on the so-called 2P method (Photopolymerization method).
【０００９】上記第１の方法は、転写性光硬化樹脂フィ
ルムを第１の記録層上に当接させ、この転写性光硬化樹
脂フィルムの背面から第２の情報記録層を形成する微細
凹凸を有するスタンパーを衝合させてその微細凹凸を転
写性光硬化樹脂フィルムに転写し、その後転写性光硬化
樹脂フィルムに対して光照射による硬化処理を行いスタ
ンパを排除することによって第２の微細凹凸を形成する
ものである。In the first method, the transferable photocurable resin film is brought into contact with the first recording layer, and fine concavities and convexities forming a second information recording layer are formed from the back surface of the transferable photocurable resin film. The second fine unevenness is formed by abutting the stamper having the fine unevenness on the transferable photocurable resin film and then curing the transferable photocurable resin film by light irradiation to eliminate the stamper. To form.
【００１０】図３に示すように、転写性光硬化樹脂フィ
ルム６０は比較的粘性に富むものであることから、その
両面に剥離性の保護シート６１および６２が形成されて
なるものであり、これを図４Ａに示すように一方の保護
シート６１を剥離した状態でその剥離面に第１の情報記
録層が形成された基板１を当接させて押圧ローラ６３お
よび６４間に挟み込んで基板１上の第１の情報記録層１
１の微細凹凸２１を転写性光硬化樹脂フィルム６０に圧
着転写することによって微細凹凸２１を埋込んで、その
後他方の保護シート６２を剥離するものであるが、この
場合転写性光硬化樹脂フィルム６０の保護シート６２と
基板１に対する接着力がほぼ同等であることから図７に
示すように、保護シートと共にその樹脂フィルム６０の
一部６０ａが剥離されるという不都合が生じる。As shown in FIG. 3, since the transferable photo-curable resin film 60 is relatively viscous, peelable protective sheets 61 and 62 are formed on both surfaces thereof. 4A, in a state where one protective sheet 61 is peeled off, the substrate 1 on which the first information recording layer is formed is brought into contact with the peeled surface and is sandwiched between the pressure rollers 63 and 64, and the first sheet on the substrate 1 Information recording layer 1
The fine concavo-convex 21 is embedded in the transferable photo-curable resin film 60 by pressure-transferring the fine concavo-convex 21 and then the other protective sheet 62 is peeled off. Since the protective sheet 62 and the adhesive force to the substrate 1 are substantially equal to each other, a part 60a of the resin film 60 is peeled off together with the protective sheet as shown in FIG.
【００１１】このような不都合を回避するために予め基
板１とフィルム６０との圧着前にフィルム６０に対して
光硬化を行って保護シート６１，６２からの剥離が良好
になされるようにすることが考えられるが、この場合に
はその後のスタンパーによるフィルム６０に対する第２
の微細凹凸の形成を確実に行うことに問題が生じる。ま
た、実際上この転写性光硬化樹脂フィルム６０は高価格
であるために、これによって充分大なる膜厚に第１およ
び第２の情報記録層１１および１２間の透明中間膜３３
を形成する場合、高価格化を招来するという問題があ
る。In order to avoid such an inconvenience, the film 60 is previously photo-cured before the substrate 1 and the film 60 are pressure-bonded to each other so that they can be peeled off from the protective sheets 61 and 62 favorably. However, in this case, a second stamper is applied to the film 60.
There is a problem in surely forming the fine irregularities. In addition, since the transferable photo-curable resin film 60 is practically expensive, the transparent intermediate film 33 between the first and second information recording layers 11 and 12 has a sufficiently large film thickness.
When forming the, there is a problem that the price is increased.
【００１２】一方、第２の方法の２Ｐ法は、上述した第
１の情報記録層１１が形成された基板１上もしくはスタ
ンパー側の少なくとも一方に液状光硬化性樹脂一般には
紫外線硬化樹脂を介して基板１とスタンパを衝合圧着さ
せてスタンパーの微細凹凸をこの光硬化性樹脂に転写
し、基板１側からの光照射によってこれを硬化して第２
の微細凹凸２２の形成を行う。しかしながら、この２Ｐ
法による場合、その液状光硬化性樹脂を、透明中間膜３
３として望まれる程度に充分大なる厚さに、かつ各部一
様な厚さに形成することがむずかしいという問題があ
る。On the other hand, in the 2P method of the second method, a liquid photocurable resin, generally an ultraviolet curable resin, is provided on at least one of the substrate 1 on which the first information recording layer 11 is formed and the stamper side. The substrate 1 and the stamper are abutted and pressure-bonded to each other to transfer the fine irregularities of the stamper to the photo-curable resin, and the light is irradiated from the substrate 1 side to cure the fine pattern, and the second
The fine irregularities 22 are formed. However, this 2P
In the case of the method, the liquid photocurable resin is used as the transparent intermediate film 3
There is a problem that it is difficult to form a sufficiently thick film as desired as No. 3 and a uniform thickness in each part.
【００１３】本発明は、上述したような諸問題の解決を
はかり多層光学記録媒体において、その各情報記録層間
の間隔を充分大に、しかも均一な厚さに設定することが
できるようにし、また価格の低廉化をはかることができ
るようにした多層光学記録媒体とその製造方法を提供す
るものである。The present invention solves the above-mentioned problems and makes it possible to set the distance between the respective information recording layers to a sufficiently large and uniform thickness in a multilayer optical recording medium. The present invention provides a multilayer optical recording medium and a manufacturing method thereof, which can reduce the price.
【００１４】[0014]
【課題を解決するための手段】本発明による多層光学記
録媒体は、第１の微細凹凸が形成された第１の情報記録
層を有する基板上に、第１の微細凹凸を埋込んで転写性
光硬化樹脂フィルムと、このフィルム上に第２の情報記
録層の第２の微細凹凸を形成する液状光硬化樹脂層の光
硬化層とによる透明中間膜が配置された構成とする。A multi-layer optical recording medium according to the present invention has a transferability by embedding the first fine unevenness on a substrate having a first information recording layer on which the first fine unevenness is formed. A transparent intermediate film composed of a photo-curable resin film and a photo-curable layer of a liquid photo-curable resin layer for forming the second fine irregularities of the second information recording layer is arranged on the film.
【００１５】また、本発明製造方法は、第１の情報記録
層を有する基板に、転写性光硬化樹脂フィルムを圧着し
光硬化させる工程と、この光硬化された光硬化樹脂フィ
ルムの上に、液状光硬化樹脂層を被着形成する工程と、
この液状光硬化樹脂層に第２の情報記録層を構成する微
小凹凸を形成する工程とをとって多層光学記録媒体を得
る。Further, in the manufacturing method of the present invention, a step of pressure-bonding the transferable photo-curable resin film onto the substrate having the first information recording layer to photo-cur it, and applying the photo-curable resin film to the photo-curable resin film, A step of depositing a liquid photocurable resin layer,
A multilayer optical recording medium is obtained through a step of forming fine irregularities forming the second information recording layer on the liquid photocurable resin layer.
【００１６】上述した本発明構成および本発明方法によ
れば、情報記録層間に転写性光硬化樹脂フィルムいわゆ
るドライフォトポリマフィルムと２Ｐ法を適用する光硬
化性樹脂層との両者によって透明中間膜を構成するよう
にしたことから、その厚さを充分大に、また透明中間膜
を、一様な厚さに形成することができる転写性光硬化樹
脂フィルムの介在によって構成したので、一様な厚さの
透明中間膜を形成することかできる。According to the above-mentioned constitution of the present invention and the method of the present invention, a transparent intermediate film is formed between the information recording layers by both the transferable photo-curable resin film so-called dry photopolymer film and the photo-curable resin layer to which the 2P method is applied. The thickness of the transparent intermediate film is sufficiently large, and the transparent intermediate film is formed by interposing a transferable photo-curable resin film capable of forming a uniform thickness. It is possible to form a transparent intermediate film.
【００１７】また、上述の本発明方法によれば、転写性
光硬化樹脂フィルムに対して光硬化処理を行って後に、
液状光硬化性樹脂層による２Ｐ法を適用することから、
転写性光硬化樹脂フィルムを第１の情報記録層を有する
基板に接合させた状態で良好な剥離性をもって保護シー
トを剥離できること、また第２の微細凹凸に関しては２
Ｐ法を適用することによって正確で高精度な微細凹凸を
形成することができる。Further, according to the above-mentioned method of the present invention, after the photocuring treatment is performed on the transferable photocurable resin film,
Since the 2P method using the liquid photocurable resin layer is applied,
In the state where the transferable photo-curable resin film is bonded to the substrate having the first information recording layer, the protective sheet can be peeled off with good peelability, and the second fine unevenness is 2
By applying the P method, it is possible to form accurate and highly precise fine unevenness.
【００１８】[0018]
【発明の実施の形態】本発明の具体的な実施形態を説明
する。以下の説明は主として、それぞれ例えばデータ情
報の記録ピットやトラッキング用のプリグルーブ等の微
細凹凸が形成された第１および第２の２層の情報記録層
が透明中間膜を介して積層されたＲＯＭ型の２層光ディ
スクに適用する場合であるが、本発明は、このような光
ディスクに限られるものではなく、例えば光磁気ディス
ク、相変化光ディスク、そのほかカード状、シート状等
の微細凹凸を有する情報記録層が２層以上透明中間膜を
介して積層された各種光学記録媒体に適用できることは
いうまでもない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described. In the following description, mainly, a ROM in which first and second two information recording layers each having fine irregularities such as data information recording pits and tracking pregrooves are laminated via a transparent intermediate film, respectively. However, the present invention is not limited to such an optical disc, and is, for example, a magneto-optical disc, a phase change optical disc, and other information having fine irregularities such as a card shape and a sheet shape. It goes without saying that it can be applied to various optical recording media in which two or more recording layers are laminated with a transparent intermediate film interposed therebetween.
【００１９】図１は、本発明による一例の概略断面図
で、それぞれ例えばデータ情報の記録ピットやトラッキ
ング用のプリグルーブ等の第１および第２の微細凹凸２
１および２２を有する第１および第２の情報記録層１１
および１２が、透明中間膜３３を介して積層されてな
る。この透明中間膜３３は、第１の微細凹凸２１を埋め
込んで形成された透明の転写性光硬化樹脂フィルム６０
と、液状光硬化性樹脂３の硬化層とによって構成されて
成る。FIG. 1 is a schematic sectional view of an example according to the present invention. First and second fine irregularities 2 such as recording data recording pits and tracking pregrooves, respectively.
First and second information recording layer 11 having 1 and 22
And 12 are laminated with a transparent intermediate film 33 interposed therebetween. This transparent intermediate film 33 is a transparent transferable photocurable resin film 60 formed by embedding the first fine irregularities 21.
And a cured layer of the liquid photocurable resin 3.
【００２０】この場合図２に示すように、一主面にデー
タ情報の記録ピット、トラッキング用のプリグルーブ等
の第１の微細凹凸２１が形成された透明基板１を用意す
る。この透明基板１は、例えばポリカーボネート（Ｐ
Ｃ）の射出成形によって形成する。そして、この微細凹
凸２１上に例えばＳｉＮ膜より成る半透明膜１３を被着
形成する。In this case, as shown in FIG. 2, the transparent substrate 1 having the first fine irregularities 21 such as data information recording pits and tracking pregrooves formed on one main surface is prepared. This transparent substrate 1 is made of, for example, polycarbonate (P
It is formed by injection molding of C). Then, a semitransparent film 13 made of, for example, a SiN film is formed on the fine irregularities 21 by deposition.
【００２１】一方、図３に示すように、転写性光硬化樹
脂フィルム６０すなわちドライフォトポリマフィルム例
えばデュポン社製の〔ＳＵＲＰＨＥＸ〕（商品名）を用
意する。このドライフォトポリマフィルム６０は、その
両面に剥離性の保護シート６１，６２が被覆されている
ものであるが、図４Ａで示すように、その一方の保護シ
ートを剥離してその剥離面を基板１の第１の情報記録層
１１上に衝合させ、例えば圧着ローラ６３および６４間
に移行させ、例えば７０〜８０℃で軟化させることによ
って圧着する。On the other hand, as shown in FIG. 3, a transferable photo-curable resin film 60, that is, a dry photopolymer film, for example, [SURPHEX] (trade name) manufactured by DuPont is prepared. The dry photopolymer film 60 has peelable protective sheets 61 and 62 coated on both sides thereof. As shown in FIG. 4A, one of the protective sheets is peeled off and the peeled surface is used as a substrate. The first information recording layer 11 is abutted against the first recording layer 11 and is moved, for example, between the pressure-bonding rollers 63 and 64, and is softened at, for example, 70 to 80 ° C. to be pressure-bonded.
【００２２】その後、図４Ｂに示すようにフィルム６０
に一方の保護シート６２を被着させたままの状態で、例
えば透明基板１側から紫外線（ＵＶ）照射を行って転写
性光硬化樹脂フィルムすなわちドライフォトポリマフィ
ルム６０の硬化処理を行う。Thereafter, as shown in FIG. 4B, the film 60
With one of the protective sheets 62 still attached, the transferable photocurable resin film, that is, the dry photopolymer film 60 is cured by irradiating ultraviolet rays (UV) from the transparent substrate 1 side, for example.
【００２３】その後、図４Ｃに示すように、フィルム６
０の保護シート６２を剥離する。このときフィルム６０
は露光硬化されていることによって保護シート６２の剥
離は良好に行われてフィルム６０は基板１の第１の情報
記録層１１に密着状態が保持される。Thereafter, as shown in FIG. 4C, the film 6
The protective sheet 62 of No. 0 is peeled off. Film 60 at this time
Since the film has been exposed and cured, the protective sheet 62 is peeled off well, and the film 60 is kept in close contact with the first information recording layer 11 of the substrate 1.
【００２４】この転写性光硬化樹脂フィルム６０によっ
て第１の微細凹凸２１が埋め込まれて平坦表面を有する
基板１上に、２Ｐ法によって第２の情報記録層１２を形
成する。このために、図５にその概略断面図を示すよう
に基板１のそのフィルム６０を有する側の面を、液状光
硬化性樹脂３例えば紫外線硬化性樹脂〔日本合成ゴム社
製Ｒ６０２１（商品名）〕を介して第２の情報記録層の
第２の微細凹凸を形成するための微細凹凸８ｓが形成さ
れたスタンパー８に衝合圧着させて、液状光硬化性樹脂
３にスタンパー８の微細凹凸のパターンを転写してこれ
に第２の微細凹凸２２を形成する。その後、例えば基板
１側から紫外線（ＵＶ）照射を行って液状光硬化性樹脂
３を硬化する。A second information recording layer 12 is formed by the 2P method on the substrate 1 having a flat surface in which the first fine irregularities 21 are embedded by the transferable photocurable resin film 60. For this purpose, as shown in the schematic cross-sectional view of FIG. 5, the surface of the substrate 1 having the film 60 is covered with a liquid photocurable resin 3, for example, an ultraviolet curable resin [R6021 (trade name) manufactured by Japan Synthetic Rubber Co., Ltd.]. ] Through abutment to the stamper 8 on which the fine unevenness 8s for forming the second fine unevenness of the second information recording layer is formed, and the fine unevenness of the stamper 8 is attached to the liquid photocurable resin 3. The pattern is transferred and the second fine unevenness 22 is formed on the pattern. After that, for example, ultraviolet (UV) irradiation is performed from the substrate 1 side to cure the liquid photocurable resin 3.
【００２５】その後、スタンパー８を剥離する。このよ
うにするとスタンパ上の微細凹凸８ｓのパターンが転写
された第２の微細凹凸２２が形成される。この第２の微
細凹凸２２を有する面に図１に示すように、Ａｌ蒸着膜
等による反射膜１４を形成して第２の情報記録２を形成
し、これの上に、保護膜１４を形成する。このようにす
ると第１および第２の情報記録層１１および１２が積層
され、転写性光硬化樹脂フィルム６０と液状光硬化性樹
脂３の硬化層によって透明中間膜３３が形成される。そ
して、第２の微細凹凸２２上に、Ａｌ等の反射膜１４が
形成され、これの上に紫外線硬化樹脂膜等より成る保護
膜６が形成されて目的とする２層光ディスクすなわち多
層光学記録媒体が得られる。After that, the stamper 8 is peeled off. In this way, the second fine unevenness 22 to which the pattern of the fine unevenness 8s on the stamper is transferred is formed. As shown in FIG. 1, a reflective film 14 made of an Al vapor deposition film or the like is formed on the surface having the second fine irregularities 22 to form a second information recording 2, and a protective film 14 is formed thereon. To do. In this way, the first and second information recording layers 11 and 12 are laminated, and the transparent intermediate film 33 is formed by the transferable photocurable resin film 60 and the cured layer of the liquid photocurable resin 3. Then, a reflective film 14 of Al or the like is formed on the second fine irregularities 22, and a protective film 6 made of an ultraviolet curable resin film or the like is formed on the reflective film 14 to form a desired two-layer optical disk, that is, a multilayer optical recording medium. Is obtained.
【００２６】このような本発明によって得た多層光学記
録媒体は転写性光硬化樹脂フィルム６０と２Ｐ法すなわ
ち液状光硬化性樹脂３との積層によることから、第１お
よび第２の情報記録層間１１および１２の間隔を充分大
に、すなわち例えば３０〜６０μｍの例えば４０μｍに
設定することができる。また基本的には一定の厚さに設
定された転写性光硬化樹脂フィルム６０が用いられてい
ることによって、その透明中間膜３３の厚さは一様の厚
さに設定することができる。Since the multilayer optical recording medium obtained according to the present invention is formed by laminating the transferable photo-curable resin film 60 and the 2P method, that is, the liquid photo-curable resin 3, the first and second information recording layers 11 and 11 are formed. It is possible to set the intervals of 12 and 12 sufficiently large, that is, for example, 40 μm, for example, 30 to 60 μm. Further, since the transferable photo-curable resin film 60 having a constant thickness is basically used, the transparent intermediate film 33 can have a uniform thickness.
【００２７】また、第２の情報記録層１２においては２
Ｐ法を適用したことによって確実正確に第２の微細凹凸
２２の形成を行うことができ、光学的特性に優れた多
層、この例においては２層の光学記録媒体を得ることが
できる。Further, in the second information recording layer 12, 2
By applying the P method, the second fine concavities and convexities 22 can be formed reliably and accurately, and a multi-layer optical recording medium having excellent optical characteristics, that is, a two-layer optical recording medium can be obtained.
【００２８】尚、上述した例においては、２層の情報記
録層を有する光ディスクを形成する場合について主とし
て説明したものであるが、２層以上の、また光ディスク
に限らず微細凹凸が形成される光磁気記録層、相変化記
録層等よりなる情報記録層を有する多層光学記録媒体に
本発明を適用することもできる。In the above example, the case where an optical disc having two information recording layers is formed is mainly described, but light having two or more layers and not limited to the optical disc and having fine irregularities is formed. The present invention can also be applied to a multilayer optical recording medium having an information recording layer such as a magnetic recording layer and a phase change recording layer.
【００２９】また、上述した例においては、第１の情報
記録層１１の第１の微細凹凸２１を基板１の成型と共に
射出成型によって形成した場合であるが、これを２Ｐ法
によって形成するなどその形成方法は上述した例に限る
ものでないことは言うまでもない。その他、上述した例
に限らず本発明による多層光学記録媒体方法は種々の変
形変更できることは明らかである。Further, in the above-mentioned example, the first fine unevenness 21 of the first information recording layer 11 is formed by injection molding together with molding of the substrate 1, but this is formed by the 2P method. It goes without saying that the forming method is not limited to the above-mentioned example. Besides, it is apparent that the multilayer optical recording medium method according to the present invention is not limited to the above-mentioned examples, and various modifications can be made.
【００３０】尚、上述の本発明方法において、液状光硬
化性樹脂３に対する光硬化の照射光は、基板１および硬
化後の転写性光硬化フィルム６０を通じて行うことか
ら、この波長光、例えば紫外線例えば３６５ｎｍの波長
（ｉ線）に対し、基板１は高い透過率を有する透明基板
によって構成する。更に硬化後の転写性光硬化フィルム
６０は、硬化前とはその分光特性が変化して上述の光硬
化照射光の例えば紫外線に対し高い透過率となる特性の
転写性光硬化フィルムによって構成するとか、或いは、
この転写性光硬化フィルムを透過する光に対し、感光性
を高めるインシェータを液状光硬化性樹脂３に添加して
おく。In the above-described method of the present invention, the light for irradiating the liquid photocurable resin 3 is photocurable through the substrate 1 and the transferable photocurable film 60 after curing. The substrate 1 is composed of a transparent substrate having a high transmittance for a wavelength of 365 nm (i-line). Further, the transferable photocurable film 60 after curing may be composed of a transferable photocurable film having a characteristic that its spectral characteristics change from those before curing and has a high transmittance to the above-mentioned photocuring irradiation light, for example, ultraviolet rays. Or
The liquid photocurable resin 3 is preliminarily added with an inshader that enhances photosensitivity to light transmitted through the transferable photocurable film.
【００３１】また、本発明による光学記録媒体におい
て、その基板１および透明中間膜３３は、この光学記録
媒体に対する光学的情報の記録ないしは読み出しを行う
例えば半導体レーザー光に対して高い光透過率を示し、
また、半透明膜１３は同様の光に対して或る程度反射
し、或る程度透過する光学的特性とする。In the optical recording medium according to the present invention, the substrate 1 and the transparent intermediate film 33 have a high light transmittance with respect to, for example, a semiconductor laser beam for recording or reading optical information with respect to the optical recording medium. ,
Further, the semitransparent film 13 has an optical characteristic of reflecting a certain amount of light and transmitting a certain amount of light.
【００３２】[0032]
【発明の効果】上述したように本発明によれば転写性光
硬化樹脂フィルム６０と液状光硬化性樹脂層３の両者の
積層によって複数の情報記録層間の透明中間膜３３を形
成するようにしたことによって必要充分で均一な厚さの
透明中間膜を形成することができる。また厚い透明中間
膜３３を介して積層される情報記録層の微細凹凸の形成
を液状光硬化性樹脂に対する２Ｐ法によって形成するこ
とができるようにしたことから、高精度の光学特性に優
れた多層光学記録媒体を構成することができる。As described above, according to the present invention, the transparent intermediate film 33 between a plurality of information recording layers is formed by laminating both the transferable photocurable resin film 60 and the liquid photocurable resin layer 3. As a result, a transparent intermediate film having a necessary and sufficient thickness can be formed. Further, since the fine irregularities of the information recording layer laminated via the thick transparent intermediate film 33 can be formed by the 2P method with respect to the liquid photo-curable resin, a multi-layer having high precision and excellent optical characteristics can be obtained. An optical recording medium can be constructed.
【図１】本発明による光学記録媒体の一例の概略断面図
である。FIG. 1 is a schematic sectional view of an example of an optical recording medium according to the present invention.
【図２】本発明による光学記録媒体の第１の情報記録層
が形成された基板の一例の概略断面図である。FIG. 2 is a schematic cross-sectional view of an example of a substrate on which a first information recording layer of an optical recording medium according to the present invention is formed.
【図３】本発明による光学記録媒体の製造方法に用いら
れる転写光硬化樹脂フィルムの概略断面図である。FIG. 3 is a schematic cross-sectional view of a transfer photocurable resin film used in the method for producing an optical recording medium according to the present invention.
【図４】Ａ，ＢおよびＣは本発明方法の説明に供する一
工程の断面図である。4A, 4B, and 4C are cross-sectional views of one step for explaining the method of the present invention.
【図５】本発明方法の説明に供する一工程の断面図であ
る。FIG. 5 is a cross-sectional view of one step for explaining the method of the present invention.
【図６】従来の多層光学記録媒体の概略断面図である。FIG. 6 is a schematic cross-sectional view of a conventional multilayer optical recording medium.
【図７】従来の多層光学記録媒体の一工程図である。FIG. 7 is a process chart of a conventional multilayer optical recording medium.
１ 基板 ３ 光硬化性樹脂 ６ 保護膜 ８ スタンパー １１ 第１の情報記録層 １２ 第２の情報記録層 １３ 半透明膜 １４ 反射膜 ２１ 第１の微細凹凸 ２２ 第２の微細凹凸 ３３ 透明中間膜 ６０ 転写性光硬化樹脂フィルム DESCRIPTION OF SYMBOLS 1 Substrate 3 Photocurable resin 6 Protective film 8 Stamper 11 First information recording layer 12 Second information recording layer 13 Semi-transparent film 14 Reflective film 21 First fine unevenness 22 Second fine unevenness 33 Transparent intermediate film 60 Transferable photocurable resin film
Claims (2)
記録層を有する基板上に、 上記第１の微細凹凸を埋込んで形成された転写性光硬化
樹脂フィルムと、このフィルム上に形成された第２の情
報記録層の第２の微細凹凸を形成する液状光硬化樹脂層
との光硬化層による透明中間膜が配置されたことを特徴
とする多層光学記録媒体。1. A transferable photocurable resin film formed by embedding the first fine irregularities on a substrate having a first information recording layer on which the first fine irregularities are formed, and on this film. And a liquid photo-curable resin layer for forming second fine irregularities of the second information recording layer formed on the transparent intermediate film, which is a photo-curable layer.
性光硬化樹脂フィルムを圧着し光硬化させる工程と、 該光硬化された光硬化樹脂フィルムの上に、液状光硬化
樹脂層を被着形成する工程と、 該液状光硬化樹脂層に第２の情報記録層を構成する微小
凹凸を形成する工程とをとることを特徴とする多層光学
記録媒体の製造方法。2. A step of pressure-bonding a transferable photo-curable resin film onto a substrate having a first information recording layer to photo-cur it, and a liquid photo-curable resin layer on the photo-cured photo-curable resin film. A method for producing a multi-layer optical recording medium, comprising: a step of depositing and forming, and a step of forming minute irregularities forming a second information recording layer on the liquid photocurable resin layer.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22056595A JP3460402B2 (en) | 1995-08-29 | 1995-08-29 | Multilayer optical recording medium and manufacturing method thereof |
| US08/607,760 US5708652A (en) | 1995-02-28 | 1996-02-27 | Multi-layer recording medium and method for producing same |
| US08/978,570 US6270611B1 (en) | 1995-02-28 | 1997-11-26 | Multi-layer recording medium and method for producing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22056595A JP3460402B2 (en) | 1995-08-29 | 1995-08-29 | Multilayer optical recording medium and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0963112A true JPH0963112A (en) | 1997-03-07 |
| JP3460402B2 JP3460402B2 (en) | 2003-10-27 |
Family
ID=16752989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22056595A Expired - Fee Related JP3460402B2 (en) | 1995-02-28 | 1995-08-29 | Multilayer optical recording medium and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3460402B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003032305A1 (en) * | 2001-10-02 | 2003-04-17 | Bridgestone Corporation | Photo-curable transfer sheet, laminate, optical information recording substrate, method for manufacture thereof, and optical information recording medium |
| US7195691B2 (en) | 2002-07-04 | 2007-03-27 | Matsushita Electric Industrial Co., Ltd. | Optical data recording medium and manufacturing method for the same |
| JP2007294098A (en) * | 2007-06-15 | 2007-11-08 | Lintec Corp | Sheet for manufacturing optical disk |
| US7497916B2 (en) | 2002-03-27 | 2009-03-03 | Panasonic Corporation | Method of manufacturing multilayer optical information recording medium |
-
1995
- 1995-08-29 JP JP22056595A patent/JP3460402B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003032305A1 (en) * | 2001-10-02 | 2003-04-17 | Bridgestone Corporation | Photo-curable transfer sheet, laminate, optical information recording substrate, method for manufacture thereof, and optical information recording medium |
| EP1437726A1 (en) * | 2001-10-02 | 2004-07-14 | Bridgestone Corporation | Photocurable transfer sheet; laminate optical information recording substrate; method for manufacture thereof and optical information recording medium |
| EP1437726A4 (en) * | 2001-10-02 | 2009-11-18 | Bridgestone Corp | Photocurable transfer sheet; laminate optical information recording substrate; method for manufacture thereof and optical information recording medium |
| US7799404B2 (en) | 2001-10-02 | 2010-09-21 | Bridgestone Corporation | Photo-curable transfer sheet, laminate, optical information recording substrate, process for the preparation thereof, and optical information recording medium |
| US7497916B2 (en) | 2002-03-27 | 2009-03-03 | Panasonic Corporation | Method of manufacturing multilayer optical information recording medium |
| US7195691B2 (en) | 2002-07-04 | 2007-03-27 | Matsushita Electric Industrial Co., Ltd. | Optical data recording medium and manufacturing method for the same |
| KR101016131B1 (en) * | 2002-07-04 | 2011-02-17 | 파나소닉 주식회사 | Manufacturing method for optical data recording medium |
| JP2007294098A (en) * | 2007-06-15 | 2007-11-08 | Lintec Corp | Sheet for manufacturing optical disk |
| JP4657257B2 (en) * | 2007-06-15 | 2011-03-23 | リンテック株式会社 | Optical disc manufacturing sheet |
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|---|---|
| JP3460402B2 (en) | 2003-10-27 |
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