JP2005141799A - Apparatus for manufacturing optical recording medium and method for manufacturing the same - Google Patents

Apparatus for manufacturing optical recording medium and method for manufacturing the same Download PDF

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JP2005141799A
JP2005141799A JP2003374584A JP2003374584A JP2005141799A JP 2005141799 A JP2005141799 A JP 2005141799A JP 2003374584 A JP2003374584 A JP 2003374584A JP 2003374584 A JP2003374584 A JP 2003374584A JP 2005141799 A JP2005141799 A JP 2005141799A
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ultraviolet
disk
optical recording
recording medium
irradiation device
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Hidenobu Takahashi
秀宜 高橋
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Sony Music Solutions Inc
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Sony Disc Technology Inc
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<P>PROBLEM TO BE SOLVED: To reduce warpage of a disk due to curing shrinkage when an ultraviolet curing resin is formed on the surface of the disk, without lowering productivity, in forming an optical transmission layer of an optical recording medium. <P>SOLUTION: In the optical recording medium, after the uncured ultraviolet curing resin is applied on the surface of the disk, the optical transmission layer is formed by curing it by the irradiation with ultraviolet rays or the like. In the curing process, the disk 11 on which the ultraviolet curing resin is applied is irradiated with the ultraviolet rays at low illuminance by an ultraviolet irradiation device 10 until it is semi-cured. Thereafter, the disk 11 in which the resin is semi-cured is irradiated with the ultraviolet rays at the illuminance higher than that of the ultraviolet irradiation device 10, by an ultraviolet irradiation device 20 so that it is fully cured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、光記録媒体、特に紫外線硬化樹脂層を有する光記録媒体の製造装置及びその製造方法に関する。   The present invention relates to an apparatus for manufacturing an optical recording medium, particularly an optical recording medium having an ultraviolet curable resin layer, and a manufacturing method thereof.

光記録媒体例えば光ディスクの大容量化は、光ピックアップで使用されるレーザ光の短波長化と、対物レンズの開口数ＮＡを大きくし、集光スポットのサイズを小さくすることで達成できる。   Increasing the capacity of an optical recording medium such as an optical disk can be achieved by shortening the wavelength of laser light used in an optical pickup, increasing the numerical aperture NA of the objective lens, and reducing the size of the focused spot.

例えばＣＤ（Compact Disc）では、レーザ光波長が７８０ｎｍ、開口数ＮＡが０．４５であり、６５０ＭＢ（メガバイト）の記憶容量である。ＤＶＤ（Digital
Versatile Disc）ではレーザ光波長が６５０ｎｍ、開口数ＮＡが０．６とされ、ＣＤの６〜８倍の４．７ＧＢ（ギガバイト）の記憶容量を有している。さらにブルーレイディスク（Blu-Ray
Disc）においては、レーザ光波長が４００ｎｍ程度、開口数ＮＡを０．８５まで大きくすることにより、ＤＶＤの４倍以上の高密度記録容量（＞２０ＧＢ/面）を実現している。 For example, a CD (Compact Disc) has a laser beam wavelength of 780 nm, a numerical aperture NA of 0.45, and a storage capacity of 650 MB (megabytes). DVD (Digital
Versatile Disc) has a laser beam wavelength of 650 nm, a numerical aperture NA of 0.6, and a storage capacity of 4.7 GB (gigabytes), which is 6 to 8 times the CD. Furthermore, Blu-ray Disc (Blu-Ray
In (Disc), the laser beam wavelength is increased to about 400 nm and the numerical aperture NA is increased to 0.85, thereby realizing a high density recording capacity (> 20 GB / surface) that is four times or more that of DVD.

図５は高密度の光ディスクの一例を示すものである。図５Aに示す様に光ディスクＤＣは、中心部にセンターホールＣＨが開口された略円盤形状をしており、ドライブ方向ＤＲに回転駆動される。情報を記録または再生するときには、光ディスクＤＣ中の光学記録層に対して、例えば開口数ＮＡが０．８以上の対物レンズＯＬによって、青〜青紫色の波長領域のレーザ光ＬＴが照射される。   FIG. 5 shows an example of a high-density optical disc. As shown in FIG. 5A, the optical disc DC has a substantially disk shape with a center hole CH opened at the center, and is driven to rotate in the drive direction DR. When recording or reproducing information, the optical recording layer in the optical disc DC is irradiated with laser light LT in the blue to blue-violet wavelength region, for example, by an objective lens OL having a numerical aperture NA of 0.8 or more.

光ディスクＤＣの断面図である図５Ｂを示す。ディスク基板１は、厚さが約１．１ｍｍのポリカーボネートからなり、このディスク基板１の凹凸に沿って光学記録層２が形成されている。光学記録層２に所定の膜厚、例えば０．１ｍｍのカバー層である光透過層３が形成されている。   FIG. 5B is a cross-sectional view of the optical disc DC. The disk substrate 1 is made of polycarbonate having a thickness of about 1.1 mm, and an optical recording layer 2 is formed along the unevenness of the disk substrate 1. On the optical recording layer 2, a light transmission layer 3 which is a cover layer having a predetermined film thickness, for example, 0.1 mm is formed.

図５Ｂに示すように、上述した光ディスクＤＣの光学記録層２に対して、対物レンズＯＬを介されたレーザ光ＬＴが光透過層３の側から照射される。対物レンズＯＬの光ディスクからの距離を調整して、光学記録層２に焦点を合わせ、光学記録層２に対して記録または再生がなされる。光学記録層２で反射された戻り光は受光素子で受光される。   As shown in FIG. 5B, the optical recording layer 2 of the optical disc DC described above is irradiated with laser light LT from the light transmitting layer 3 side through the objective lens OL. The distance from the optical disk of the objective lens OL is adjusted, the optical recording layer 2 is focused, and recording or reproduction is performed on the optical recording layer 2. The return light reflected by the optical recording layer 2 is received by the light receiving element.

上述した微細な凹凸形状は、ランドおよびグルーブを交互に形成する。例えばレーザ光ＬＴの入射側に近い部分がグルーブと定義され、入射側から遠い部分がランドと定義される。   The fine concavo-convex shape described above forms lands and grooves alternately. For example, a portion close to the incident side of the laser beam LT is defined as a groove, and a portion far from the incident side is defined as a land.

書き込み可能な光ディスクの場合には、ランドおよびグルーブの一方の光学記録層またはその両方の光学記録層に対して信号が記録される。ランドおよびグルーブは、トラッキングのために使用され、また、スピンドルモータの回転制御に使用され、さらに、ウォブルされたグルーブによってディスク上の位置を示すアドレス情報を記録するために使用される。記録可能なディスクでは、このアドレス情報を参照して所望の位置にデータを記録している。   In the case of a writable optical disc, a signal is recorded on one of the land and groove optical recording layers or both optical recording layers. The land and groove are used for tracking, used for rotation control of the spindle motor, and further used for recording address information indicating a position on the disk by the wobbled groove. In a recordable disc, data is recorded at a desired position with reference to this address information.

書き込み可能な光ディスクの場合には、光学記録層２は、上層側から例えば誘電体膜、相変化膜等の記録膜、誘電体膜および反射膜が順に積層された構成を有する。層構成、層数は、記録材料の種類や設計によって異なる。   In the case of a writable optical disc, the optical recording layer 2 has a configuration in which, for example, a dielectric film, a recording film such as a phase change film, a dielectric film, and a reflective film are sequentially laminated from the upper layer side. The layer configuration and the number of layers vary depending on the type and design of the recording material.

また読み出し専用の光ディスクの場合には、ディスク基板１のピットに沿ってアルミニウム（Ａｌ）等によって蒸着された反射膜が形成され、その上部に光透過層３が形成される。   In the case of a read-only optical disk, a reflective film deposited by aluminum (Al) or the like is formed along the pits of the disk substrate 1, and the light transmission layer 3 is formed thereon.

光透過層３には紫外線を照射することにより硬化する紫外線硬化樹脂が用いられ、例えばスピンコート法で塗布される。ここで、光透過層３は０．１ｍｍ（１００μｍ）と比較的厚いために硬化の過程における硬化収縮により、光透過層３の側にディスクが引っ張られ、硬化後の反りの増大を引き起こし、大きな問題となる。   The light transmission layer 3 is made of an ultraviolet curable resin that is cured by irradiating ultraviolet rays, and is applied by, for example, a spin coating method. Here, since the light transmission layer 3 is relatively thick as 0.1 mm (100 μm), the disk is pulled to the light transmission layer 3 side due to curing shrinkage in the curing process, causing an increase in warping after curing. It becomes a problem.

従来のＣＤ、ＤＶＤ等の光ディスクにおいても、保護層や接着層に紫外線硬化樹脂が使用されている。しかしながらＣＤについては、保護層に紫外線硬化樹脂が使用されているが、塗布膜厚が５μｍ程度と薄いため、硬化後の反りの変化量も少なく、大きな問題とはならなかった。   Also in conventional optical disks such as CD and DVD, an ultraviolet curable resin is used for the protective layer and the adhesive layer. However, for the CD, an ultraviolet curable resin is used for the protective layer. However, since the coating film thickness is as thin as about 5 μm, the amount of change in warping after curing is small, and it has not been a big problem.

ＤＶＤについては、少なくとも一方に情報記録面が設けられた２枚の薄型ディスクを貼り合わせる構造となっており、紫外線硬化樹脂は当該２枚のディスクを貼り合わせるときの接着剤として用いられる。   A DVD has a structure in which two thin discs each having an information recording surface provided on at least one side are bonded together, and an ultraviolet curable resin is used as an adhesive when the two discs are bonded.

下記の特許文献１ではディスク上の温度を均一化し、その温度上昇を抑えることで反りの増大を防ぐことが記載されている。   The following Patent Document 1 describes that the temperature on the disk is made uniform and the increase in warpage is prevented by suppressing the temperature rise.

特許第３２７０６８８号明細書Japanese Patent No. 3270688

図６を参照して従来の紫外線照射装置について説明する。この紫外線照射装置では紫外線硬化樹脂を塗布したディスク４の塗布された側に向けて紫外線光源６、反射板７が備えられている。またディスク４の中央部に設けられた穴はディスクテーブル５上の中心部のボスに係合する。紫外線をディスク４に照射する方法としては紫外線照射領域にディスク４をコンベヤ等で通過させる方法や、ディスク４を静止させて、シャッターを開閉させる方法等がある。   A conventional ultraviolet irradiation apparatus will be described with reference to FIG. In this ultraviolet irradiation device, an ultraviolet light source 6 and a reflecting plate 7 are provided toward the coated side of the disk 4 coated with ultraviolet curable resin. A hole provided in the center of the disk 4 engages with a boss at the center of the disk table 5. As a method of irradiating the disk 4 with ultraviolet rays, there are a method in which the disk 4 is passed through an ultraviolet irradiation region by a conveyor or the like, a method in which the disk 4 is stopped and a shutter is opened and closed.

上記の従来の紫外線照射装置で硬化させた場合、照射する紫外線の照度を下げ、照射時間を長くすることにより、ディスク４の硬化収縮による反りの増大を低減できることが知られている。   It is known that when cured by the above-described conventional ultraviolet irradiation device, the increase in warpage due to curing shrinkage of the disk 4 can be reduced by lowering the illuminance of the ultraviolet rays to be irradiated and lengthening the irradiation time.

上記の方法では硬化収縮の問題を解決することは可能であるが、樹脂を硬化させるまでに要する時間が長くなり、生産性の観点から好ましくない。   Although the above method can solve the problem of curing shrinkage, it takes a long time to cure the resin, which is not preferable from the viewpoint of productivity.

この発明の目的は、紫外線硬化樹脂を用いて光透過層を形成し、硬化収縮が低減され、かつ生産性を低下せずに光記録媒体を製造する装置を提供する。   An object of the present invention is to provide an apparatus for producing an optical recording medium in which a light transmission layer is formed using an ultraviolet curable resin, curing shrinkage is reduced, and productivity is not lowered.

この発明は、一面に比較的厚い光透過層を有する光記録媒体の製造装置において、未硬化の紫外線硬化樹脂層に低い照度の第１の紫外線を照射して半硬化させる第１の紫外線照射装置と、半硬化の紫外線硬化樹脂層に上記第１の紫外線よりも高い照度の第２の紫外線を照射して完全硬化させる第２の紫外線照射装置とからなる光記録媒体の製造装置である。   The present invention provides an optical recording medium manufacturing apparatus having a relatively thick light-transmitting layer on one surface, wherein the uncured ultraviolet curable resin layer is irradiated with a first ultraviolet ray having a low illuminance to be semi-cured. And a second ultraviolet irradiation device for irradiating the semi-cured ultraviolet curable resin layer with a second ultraviolet ray having an illuminance higher than that of the first ultraviolet ray to completely cure the optical recording medium.

また、この発明は、一面に比較的厚い光透過層を有する光記録媒体の製造方法において、第１の紫外線照射装置によって未硬化の紫外線硬化樹脂層に低い照度の第１の紫外線を照射して半硬化させる第１の工程と、第２の紫外線照射装置によって半硬化の紫外線硬化樹脂層に上記第１の紫外線よりも高い照度の第２の紫外線を照射して完全硬化させる第２の工程とからなる光記録媒体の製造方法である。   Further, according to the present invention, in the method for manufacturing an optical recording medium having a relatively thick light transmission layer on one surface, the first ultraviolet irradiation device irradiates the uncured ultraviolet curable resin layer with the first ultraviolet light having a low illuminance. A first step of semi-curing, and a second step of irradiating the semi-cured ultraviolet curable resin layer with a second ultraviolet ray having an illuminance higher than the first ultraviolet ray by the second ultraviolet irradiation device to completely cure the second step. An optical recording medium manufacturing method comprising:

この発明は、高い照度でのみ紫外線を照射した場合と比較してディスクの反りの増大を低減することができる。また紫外線の照度を下げて長時間照射して、硬化させる方法と比較して、製造時間を短縮でき、かつディスクにおける反りの増大の低減する点で同程度の効果を得ることができる   The present invention can reduce an increase in warpage of the disk as compared with the case where ultraviolet rays are irradiated only at a high illuminance. Compared with the method of curing by irradiating for a long time with lowering the illuminance of ultraviolet rays, the manufacturing time can be shortened, and the same effect can be obtained in terms of reducing the increase in warpage in the disk.

図１にこの発明の一実施形態を示す。従来の紫外線照射装置との違いは、第１の紫外線照射装置である紫外線照射装置１０と第２の紫外線照射装置である紫外線照射装置２０とを工程ラインに沿って直列に配置したことである。   FIG. 1 shows an embodiment of the present invention. The difference from the conventional ultraviolet irradiation apparatus is that the ultraviolet irradiation apparatus 10 that is the first ultraviolet irradiation apparatus and the ultraviolet irradiation apparatus 20 that is the second ultraviolet irradiation apparatus are arranged in series along the process line.

紫外線照射装置１０では紫外線硬化樹脂を塗布したディスク１１の塗布された側に向けて紫外線光源１３、反射板１４が備えられている。紫外線光源１３には高圧水銀ランプや、メタルアイランドランプ等が用いられる。また反射板１４には、赤外線を反射しない、いわゆるコールドミラーが用いられるのが一般的である。またディスク１１の中央部に設けられた穴はディスクテーブル１２上の中心部のボスに係合する。ディスク１１に紫外線を照射する方法としては紫外線照射領域にディスク１１をコンベヤ等で通過させる方法や、ディスク１１を静止させて、シャッターを開閉させる方法等がある。   In the ultraviolet irradiation device 10, an ultraviolet light source 13 and a reflecting plate 14 are provided toward the coated side of a disk 11 coated with an ultraviolet curable resin. As the ultraviolet light source 13, a high-pressure mercury lamp, a metal island lamp, or the like is used. The reflector 14 is generally a so-called cold mirror that does not reflect infrared rays. A hole provided in the center of the disk 11 engages with a boss at the center of the disk table 12. As a method of irradiating the disk 11 with ultraviolet rays, there are a method of passing the disk 11 through an ultraviolet irradiation region by a conveyor or the like, a method of stopping the disk 11 and opening and closing a shutter.

この紫外線照射装置１０において、紫外線光源１３の紫外線の照度は低く（例えば３０ｍＷ／ｃｍ２）設定されている。紫外線硬化樹脂が塗布されたディスク１１がコンベヤ等によって紫外線照射装置１０に移動してくると、紫外線照射が行われるが、樹脂は完全硬化には至らず、半硬化状態となる。 In this ultraviolet irradiation device 10, the illuminance of ultraviolet rays from the ultraviolet light source 13 is set low (for example, 30 mW / cm 2 ). When the disk 11 coated with the ultraviolet curable resin is moved to the ultraviolet irradiation device 10 by a conveyor or the like, the ultraviolet irradiation is performed, but the resin is not completely cured but is in a semi-cured state.

紫外線照射装置１０で処理され、樹脂が半硬化状態となったディスク１１はコンベア等で紫外線照射装置２０に移動する。紫外線照射装置２０における装置構成は紫外線照射装置１０と同様に紫外線光源１５、反射板１６から構成される。紫外線照射装置２０においては、紫外線光源１５の紫外線の照度は、紫外線照射装置１０の紫外線光源１３の照度よりも高く（例えば９００ｍＷ／ｃｍ２）設定されている。移動してきたディスク１１は紫外線照射装置２０による高い照度の紫外線照射で、樹脂が完全硬化される。 The disk 11 which has been processed by the ultraviolet irradiation device 10 and the resin is in a semi-cured state is moved to the ultraviolet irradiation device 20 by a conveyor or the like. The apparatus configuration of the ultraviolet irradiating device 20 includes an ultraviolet light source 15 and a reflecting plate 16 as in the ultraviolet irradiating device 10. In the ultraviolet irradiation device 20, the illuminance of the ultraviolet light from the ultraviolet light source 15 is set to be higher (for example, 900 mW / cm 2 ) than the illuminance of the ultraviolet light source 13 of the ultraviolet irradiation device 10. The moving disk 11 is completely cured by the irradiation of ultraviolet rays with high illuminance by the ultraviolet irradiation device 20.

この方法により紫外線硬化樹脂の硬化前後でのディスク１１の反りの変化量を低減させることができ、かつ紫外線照射時間も長くならず、生産性を失わない。   By this method, the amount of change in the warp of the disk 11 before and after the curing of the ultraviolet curable resin can be reduced, and the ultraviolet irradiation time is not lengthened and productivity is not lost.

外径１２０ｍｍ、厚み１．１ｍｍのポリカーボネート樹脂によって形成されたディスク基板に、アクリル系の紫外線硬化樹脂を厚さ１００μｍで塗布し、従来の方法及びこの発明の方法により硬化させたときの２つの比較例を以下に示す。なお、比較例における紫外線硬化樹脂が塗布されたディスク２５の反りの測定値の定義を図４に示す。   Two comparisons when an acrylic UV curable resin is applied at a thickness of 100 μm to a disk substrate formed of a polycarbonate resin having an outer diameter of 120 mm and a thickness of 1.1 mm and cured by the conventional method and the method of the present invention. An example is shown below. In addition, the definition of the measured value of the curvature of the disk 25 coated with the ultraviolet curable resin in the comparative example is shown in FIG.

[比較例１]
従来例として図６の装置を用い、紫外線照度９００ｍＷ／ｃｍ2（波長３５５ｎｍ）で２秒間照射し硬化させたときにおけるディスク４の反りの測定値２３と、この発明の実施例として図１の装置において、紫外線照射装置１０の照度を３０ｍＷ／ｃｍ2（波長３５５ｎｍ）で５秒間照射した後、紫外線照射装置２０の照度を９００ｍＷ／ｃｍ2（波長３５５ｎｍ）で２秒間照射したときのディスク１１の反りの測定値２２とを、硬化前の反りの測定値２１と共に、それぞれ反りの角度として縦軸に、ディスク中心からの距離を半径として横軸に図２で示す。この発明の実施例では、従来例と比較して、硬化前後での反りの変化量が、半分程度に低減されている。 [Comparative Example 1]
The apparatus shown in FIG. 6 is used as a conventional example, and the measured value 23 of the warp of the disk 4 when cured by irradiating with ultraviolet illuminance of 900 mW / cm 2 (wavelength 355 nm) for 2 seconds, and the apparatus shown in FIG. , When the illuminance of the ultraviolet irradiation device 10 is irradiated at 30 mW / cm 2 (wavelength 355 nm) for 5 seconds and then the irradiance of the ultraviolet irradiation device 20 is irradiated at 900 mW / cm 2 (wavelength 355 nm) for 2 seconds. 2 are shown in FIG. 2 along with the measured value 21 of the warp before curing on the vertical axis as the angle of warpage, and on the horizontal axis as the distance from the center of the disk as the radius. In the embodiment of the present invention, the amount of change in warpage before and after curing is reduced by about half compared to the conventional example.

[比較例２]
図６の装置を用い、紫外線照度３０ｍＷ／ｃｍ2（波長３５５ｎｍ）で完全に樹脂を硬化させるためには１００秒間の紫外線照射が必要であった。そこで従来例として、紫外線照度３０ｍＷ／ｃｍ2（波長３５５ｎｍ）で１００秒間の紫外線照射をした場合におけるディスク４の反りの測定値２４について、この発明の実施例（比較例１と同様に、紫外線照射装置１０の照度を３０ｍＷ／ｃｍ2（波長３５５ｎｍ）で５秒間照射した後、紫外線照射装置２０の照度を９００ｍＷ／ｃｍ2（波長３５５ｎｍ）で２秒間照射したときのディスク１１の反りの測定値２２）との比較を図３で示す。反りの変化量は、従来例とこの発明の実施例とでは差はないが、硬化に要する時間が、この発明の実施例では７秒間（紫外線照射装置１０による照射時間５秒間＋紫外線照射装置２０による照射時間２秒間）と大幅に短縮されている。 [Comparative Example 2]
In order to completely cure the resin with an ultraviolet illuminance of 30 mW / cm 2 (wavelength 355 nm) using the apparatus shown in FIG. 6, irradiation with ultraviolet rays for 100 seconds was necessary. Accordingly, as a conventional example, the measured value 24 of the warp of the disk 4 when irradiated with ultraviolet rays for 30 seconds at an ultraviolet illuminance of 30 mW / cm 2 (wavelength 355 nm) was measured in accordance with the embodiment of the present invention (similar to Comparative Example 1). The measured value 22 of the warpage of the disk 11 when the illuminance of the apparatus 10 is irradiated at 30 mW / cm 2 (wavelength 355 nm) for 5 seconds and then the irradiance of the ultraviolet irradiation apparatus 20 is irradiated at 900 mW / cm 2 (wavelength 355 nm) for 2 seconds. 3) is shown in FIG. The amount of change in warpage is not different between the conventional example and the embodiment of the present invention, but the time required for curing is 7 seconds in the embodiment of the present invention (irradiation time 5 seconds by the ultraviolet irradiation device 10 + ultraviolet irradiation device 20). The irradiation time by 2 seconds is significantly reduced.

この発明の製造方法では、比較例１より、従来の方法である高い照度でのみディスクに紫外線を照射した場合と比較してディスクの反りの増大を低減することができる。また比較例２より、従来の方法である紫外線の照度を下げて長時間、硬化させる方法と比較して、製造時間を大きく短縮でき、かつディスクの反りの増大を低減する点で同程度の効果を得ることができる。   In the manufacturing method of the present invention, compared with Comparative Example 1, it is possible to reduce the increase in warpage of the disk as compared with the conventional method in which the disk is irradiated with ultraviolet rays only at high illuminance. Further, compared with the comparative method 2, compared with the conventional method in which the illuminance of ultraviolet rays is lowered and cured for a long time, the manufacturing time can be greatly shortened, and the same effect is obtained in that the increase in the warp of the disk is reduced. Can be obtained.

この発明は光記録媒体として書き込み可能ディスク、読み出し専用ディスクのどちらにも適用可能である。また、光透過層に限らず、保護層や接着層等で紫外線硬化樹脂を用いた光記録媒体にも広く適用可能であり、さらに光学記録層が２層以上で構成されている光記録媒体、および両面から読み取る光記録媒体にも適用可能である。   The present invention can be applied to both a writable disk and a read-only disk as an optical recording medium. In addition, the optical recording medium is not limited to the light transmission layer but can be widely applied to an optical recording medium using an ultraviolet curable resin for a protective layer, an adhesive layer, and the like, and further, an optical recording medium having two or more optical recording layers, It can also be applied to optical recording media that are read from both sides.

この発明の一実施形態に係る光ディスクの製造方法を説明するための略線図である。It is a basic diagram for demonstrating the manufacturing method of the optical disk based on one Embodiment of this invention. この発明の一実施形態での紫外線照射前の光ディスクの反りと従来例での光ディスクの反り、及び実施例での光ディスクの反りとの比較を表したグラフである。4 is a graph showing a comparison between the warpage of an optical disc before irradiation with ultraviolet light in one embodiment of the present invention, the warpage of an optical disc in a conventional example, and the warpage of an optical disc in an example. この発明の一実施形態での紫外線照射前の光ディスクの反りと従来例での光ディスクの反り、及び実施例での光ディスクの反りとの比較を表したグラフである。4 is a graph showing a comparison between the warpage of an optical disc before irradiation with ultraviolet light in one embodiment of the present invention, the warpage of an optical disc in a conventional example, and the warpage of an optical disc in an example. この発明の一実施形態での反りの測定値の定義を表した略線図である。It is a basic diagram showing the definition of the measured value of curvature in one embodiment of this invention. 従来の光ディスクの一例を説明するための略線図および断面図である。It is a basic diagram and sectional drawing for explaining an example of the conventional optical disk. 従来の光ディスクの製造方法を説明するための略線図である。It is a basic diagram for demonstrating the manufacturing method of the conventional optical disk.

符号の説明Explanation of symbols

ＤＣ 光ディスク
１ ディスク基板
２ 光学記録層
３ 光透過層（カバー層）
４ 紫外線硬化樹脂が塗布されたディスク
５ ディスクテーブル
６ 紫外線光源
７ 反射板
１１ 紫外線硬化樹脂が塗布されたディスク
１２ ディスクテーブル
１３ 紫外線光源
１４ 反射板
１５ 紫外線光源
１６ 反射板


DC optical disk 1 disk substrate 2 optical recording layer 3 light transmission layer (cover layer)
4 Disc coated with UV curable resin 5 Disc table 6 UV light source 7 Reflector 11 Disc coated with UV curable resin 12 Disc table 13 UV light source 14 Reflector 15 UV light source 16 Reflector


Claims (2)

一面に比較的厚い光透過層を有する光記録媒体の製造装置において、
未硬化の紫外線硬化樹脂層に低い照度の第１の紫外線を照射して半硬化させる第１の紫外線照射装置と、
半硬化の紫外線硬化樹脂層に上記第１の紫外線よりも高い照度の第２の紫外線を照射して完全硬化させる第２の紫外線照射装置とからなる光記録媒体の製造装置。 In an apparatus for manufacturing an optical recording medium having a relatively thick light transmission layer on one side,
A first ultraviolet irradiation device that irradiates the uncured ultraviolet curable resin layer with a first ultraviolet ray having a low illuminance to be semi-cured;
An apparatus for producing an optical recording medium, comprising: a second ultraviolet irradiation device that irradiates a semi-cured ultraviolet curable resin layer with a second ultraviolet ray having an illuminance higher than that of the first ultraviolet ray to completely cure. 一面に比較的厚い光透過層を有する光記録媒体の製造方法において、
第１の紫外線照射装置によって未硬化の紫外線硬化樹脂層に低い照度の第１の紫外線を照射して半硬化させる第１の工程と、
第２の紫外線照射装置によって半硬化の紫外線硬化樹脂層に上記第１の紫外線よりも高い照度の第２の紫外線を照射して完全硬化させる第２の工程とからなる光記録媒体の製造方法。
In a method of manufacturing an optical recording medium having a relatively thick light transmission layer on one surface,
A first step of irradiating the uncured UV curable resin layer with a first UV light having a low illuminance by the first UV light irradiation device and semi-curing;
A method for producing an optical recording medium comprising a second step of irradiating a semi-cured ultraviolet curable resin layer with a second ultraviolet ray having an illuminance higher than the first ultraviolet ray to completely cure the second ultraviolet ray irradiating device.
JP2003374584A 2003-11-04 2003-11-04 Apparatus for manufacturing optical recording medium and method for manufacturing the same Pending JP2005141799A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077885A1 (en) * 2005-12-28 2007-07-12 Origin Electric Company, Limited Method and apparatus for manufacturing optical disc
JP2008027549A (en) * 2006-07-25 2008-02-07 Ricoh Co Ltd Manufacturing method of optical recording medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077885A1 (en) * 2005-12-28 2007-07-12 Origin Electric Company, Limited Method and apparatus for manufacturing optical disc
JP2007179713A (en) * 2005-12-28 2007-07-12 Origin Electric Co Ltd Method and device for manufacturing optical disk
JP4549969B2 (en) * 2005-12-28 2010-09-22 オリジン電気株式会社 Optical disc manufacturing method and apparatus
US7842202B2 (en) * 2005-12-28 2010-11-30 Origin Electric Company Limited Production method and production apparatus of optical disc
JP2008027549A (en) * 2006-07-25 2008-02-07 Ricoh Co Ltd Manufacturing method of optical recording medium

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