JP4714666B2 - Optical information recording medium - Google Patents

Optical information recording medium Download PDF

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JP4714666B2
JP4714666B2 JP2006313648A JP2006313648A JP4714666B2 JP 4714666 B2 JP4714666 B2 JP 4714666B2 JP 2006313648 A JP2006313648 A JP 2006313648A JP 2006313648 A JP2006313648 A JP 2006313648A JP 4714666 B2 JP4714666 B2 JP 4714666B2
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JP2008130154A (en
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基光 萩原
毅 大津
章正 宮田
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Taiyo Yuden Co Ltd
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Description

本発明は、ディスク状の光情報記録媒体であって、該光情報記録媒体のレーベル面（光入射面とは反対側の面）側にスクリーン印刷やインクジェットプリンタ等により印字や描画することができる光情報記録媒体に関し、より具体的にはレーザ光照射により情報を記録することができる情報記録領域よりも前記印刷や印字や描画することができる領域を内周側に拡大したタイプの光情報記録媒体に関する。   The present invention is a disc-shaped optical information recording medium, and can be printed or drawn on a label surface (surface opposite to the light incident surface) side of the optical information recording medium by screen printing, an ink jet printer, or the like. More specifically, the optical information recording medium is a type of optical information recording in which the area where printing, printing, and drawing can be expanded on the inner circumference side than the information recording area where information can be recorded by laser light irradiation. It relates to the medium.

追記型ＣＤ（所謂ＣＤ−Ｒ）等の従来からのディスク状の光情報記録媒体においては、プリグルーブ等が設けられた光透過性基板の一方の面上に記録層及び反射層を形成した構造を有し、前記基板の他方の面側から通常７８０ｎｍ付近の波長のレーザ光が照射されて前記記録層にデータ記録及び／または前記記録層から再生されるように構成されている。上記光情報記録媒体のレーザ光が照射される面とは反対側の面は、通常レーベル面として利用されており、その表面に文字、記号、図形、模様またはこれらの組合せ等が印刷等により表示される。
また、追記型デジタル・ヴァーサタイル・ディスク（所謂ＤＶＤ−Ｒ）と称され上記ＣＤ−Ｒの半分以下のピッチでプリグルーブが設けられた光透過性基板の一方の面上に上記と同様に記録層及び反射層を形成した構造を有し、前記基板の他方の面側から通常６３０ｎｍ〜６８０ｎｍ付近の波長のレーザ光が照射されて前記記録層にデータ記録及び／または前記記録層から再生されるように構成された光情報記録媒体も提案されている。
上記のＣＤ−ＲやＤＶＤ−Ｒ等の光情報記録媒体においては、前記光透過性基板の射出成型する際に、予め、傷付き防止のための凸部を同時に設けている。これにより、光情報記録媒体を積層した際に、摺擦による光入射面の傷付きを防止している。 In a conventional disc-shaped optical information recording medium such as a write-once CD (so-called CD-R), a structure in which a recording layer and a reflective layer are formed on one surface of a light-transmitting substrate provided with a pregroove or the like. The recording layer is configured to be irradiated with a laser beam having a wavelength of usually around 780 nm from the other surface side of the substrate to be recorded and / or reproduced from the recording layer. The surface of the optical information recording medium opposite to the surface irradiated with the laser light is normally used as a label surface, and characters, symbols, figures, patterns, or combinations thereof are displayed on the surface by printing or the like. Is done.
Also, a recordable digital versatile disk (so-called DVD-R) is recorded in the same manner as described above on one surface of a light-transmitting substrate provided with pregrooves at a pitch less than half that of the CD-R. And having a structure in which a layer and a reflective layer are formed, and the recording layer is irradiated with a laser beam having a wavelength of generally 630 nm to 680 nm from the other surface side of the substrate to reproduce data from and / or reproduce from the recording layer. An optical information recording medium configured as described above has also been proposed.
In the optical information recording medium such as the above-mentioned CD-R or DVD-R, when the light-transmitting substrate is injection-molded, a convex portion for preventing scratches is provided in advance. This prevents the light incident surface from being scratched by rubbing when the optical information recording medium is laminated.

これに対し、最近では、地上波デジタルハイビジョンＴＶが急速に普及しており、上記ＤＶＤ−Ｒよりも更に短波長の青紫色のレーザ光で高密度の記録を行うことができるディスク状の光情報記録媒体の開発が進められている。
具体的には、追記型ブルーレイ・ディスク（所謂ＢＤ−Ｒ）等と称され、プリグルーブが設けられた基板上に記録層及びカバー層をこの順に形成した構造を有し、前記カバー層を有する面側から通常４００ｎｍ〜５００ｎｍ付近の波長の青紫色のレーザ光が照射されて前記記録層にデータ記録／及びまたは前記記録層から再生されるように構成された光情報記録媒体が提案されている。
また、上記のＢＤ−Ｒ等の光情報記録媒体において、上記光入射面の傷付きを防止する目的で、図３に示されるように、特許文献１には、基板１０１の記録層１０３を形成する面側の内周部Ｂに予め設ける突起部１０１ｂの高さｔ１がスピンコート法により形成されるカバー層１０４の膜厚ｔ２以上であることが提案されている。
また、図４に示されるように、特許文献２には、基板２０１上に記録層２０３とカバー層２０４とをこの順に有する光情報記録媒体において、前記カバー層２０４を形成する際に、予め、カバー層２０４の内周及び／又は外周部に傷付き防止のための凸部２０４ａ，２０４ｂを同時に設け、これにより、光情報記録媒体を積層した際に、摺擦による光入射面の傷付きを防止することが提案されている。尚、上記の図はそれぞれ光情報記録媒体の中心から右側半分の領域を示し、左側半分の領域を省略したものである。
特開２００１−１６７４７２号公報 特開２００５−１７４４０８号公報 On the other hand, recently, terrestrial digital high-definition TV has rapidly spread, and disk-shaped optical information that can be recorded with high density with a blue-violet laser beam having a shorter wavelength than the DVD-R. Development of recording media is in progress.
Specifically, it is called a recordable Blu-ray disc (so-called BD-R) or the like, and has a structure in which a recording layer and a cover layer are formed in this order on a substrate provided with a pre-groove, and has the cover layer. There has been proposed an optical information recording medium configured to be irradiated with a blue-violet laser beam having a wavelength of usually around 400 nm to 500 nm from the surface side to reproduce data from and / or reproduce data from the recording layer. .
Further, in the optical information recording medium such as the BD-R, as shown in FIG. 3, a recording layer 103 of a substrate 101 is formed in Patent Document 1 for the purpose of preventing the light incident surface from being scratched. It has been proposed that the height t1 of the protrusion 101b provided in advance on the inner peripheral portion B on the surface to be processed is equal to or greater than the film thickness t2 of the cover layer 104 formed by spin coating.
Further, as shown in FIG. 4, in Patent Document 2, in an optical information recording medium having a recording layer 203 and a cover layer 204 in this order on a substrate 201, when the cover layer 204 is formed in advance, Protrusions 204a and 204b for preventing scratches are simultaneously provided on the inner periphery and / or outer periphery of the cover layer 204, so that when the optical information recording medium is laminated, the light incident surface is damaged by rubbing. It has been proposed to prevent. Each of the above figures shows the right half area from the center of the optical information recording medium, and the left half area is omitted.
JP 2001-167472 A JP 2005-174408 A

しかしながら、上記特許文献１に記載の前者の背景技術の光情報記録媒体においては、カバー層１０４形成後の積載時に該光情報記録媒体の撓みが生じた際に光入射面が擦れて傷付きが生じやすかった。また、上記特許文献２に記載の後者の背景技術の光情報記録媒体においては、カバー層２０４形成前の積層時に光入射面側が擦れて傷付きが生じやすかった。 However, in the optical information recording medium of the former background art described in Patent Document 1, the light incident surface is rubbed and scratched when the optical information recording medium is bent during stacking after the cover layer 104 is formed. It was easy to occur. Further, in the optical information recording medium of the latter background art described in Patent Document 2, the light incident surface side is rubbed easily during the lamination before the cover layer 204 is formed, and is easily damaged.

本発明は、前記の如き問題点に鑑みてなされたものであり、本発明の目的は、カバー層側からレーザ光を照射して記録及び／又は再生する光情報記録媒体において、前記カバー層及び前記基板の光入射面側の傷付きを防止することが可能な光情報記録媒体を提供することにある。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical information recording medium for recording and / or reproducing by irradiating a laser beam from the cover layer side. An object of the present invention is to provide an optical information recording medium capable of preventing scratches on the light incident surface side of the substrate.

本発明のかかる目的は、本発明の第１の課題解決手段によれば、中心に孔を有する基板上に、記録層と、膜厚が０．１ｍｍのカバー層とをこの順に有し、前記カバー層側からレーザ光が照射されることで記録及び／又は再生が行われる光情報記録媒体において、
前記基板の前記記録層が設けられる側の表面に、プリグルーブを備えた情報記録領域と、前記情報記録領域より内周側に位置するクランピングエリアと、前記クランピングエリアよりも内周側に位置し、前記基板の成型と同時に形成され、前記カバー層の表面から突出する凸部と、前記情報記録領域の外側の前記カバー層に形成された盛り上がり部とが設けられ、
前記情報記録領域に形成された前記カバー層の表面から突出する前記凸部の高さｈ１が、前記カバー層の表面から突出する前記盛り上がり部の高さｈ２よりも大きい
ことを特徴とする光情報記録媒体によって達成される。 本発明の第１の課題解決手段によれば、前記基板の前記記録層が設けられる側の面に、プリグルーブを備えた情報記録領域と、前記基板の上面の情報記録領域より内周寄りの前記基板の内周縁の近傍のクランピングエリアに前記基板の成型と同時に設けられた凸部とを有し、さらに、前記カバー層の外周縁近傍の外周部に設けられた盛り上がり部を有するので、情報記録領域のカバー層の表面からの前記クランピングエリア内基板の内周縁の近傍の凸部の突出寸法を低く抑えつつ積載時の傷つきを防止することが可能になる。 さらに、本発明の第１の課題解決手段によれば、前記情報記録領域のカバー層表面からの前記基板の内周縁の近傍クランピングエリアの凸部の突出寸法ｈ１（例：１２０μｍ）を前記カバー層の外周縁の近傍の前記部の盛り上がりの突出寸法ｈ２（例：５０μｍ）より大きくしたので、基板もしくは光情報記録媒体が積載された状態から個別に取り出す際に、下側の基板もしくは光情報記録媒体との間に減圧された気室が設けられて剥離ミスが生じるのを防止することができる。 The above and other objects of the present invention, according to the first means for solving problems of the present invention, on a substrate having a hole in the center, a recording layer, a thickness and a 0.1mm cover layer in this order, wherein In an optical information recording medium in which recording and / or reproduction is performed by irradiating a laser beam from the cover layer side,
On the front surface of the side where the recording layer of the substrate are provided, and the information recording area having the pregroove, and clamping area located on the inner circumferential side of the information recording area, the inner peripheral side of the clamping area Is formed simultaneously with the molding of the substrate, and is provided with a protrusion protruding from the surface of the cover layer , and a raised portion formed in the cover layer outside the information recording area ,
The height h1 of the protrusion protruding from the surface of the cover layer formed in the information recording area is greater than the height h2 of the raised portion protruding from the surface of the cover layer. This is achieved by an optical information recording medium. According to the first problem-solving means of the present invention, an information recording area having a pre-groove on the surface of the substrate on which the recording layer is provided, and an information recording area closer to the inner periphery than the information recording area on the upper surface of the substrate . and a molding convex portion provided at the same time of the substrate in the clamping area in the vicinity of the inner peripheral edge of said substrate, further, because it has a raised portion formed on the outer peripheral portion of the outer peripheral edge near the cover layer, It is possible to prevent damage at the time of stacking while keeping the protruding dimension of the convex portion in the vicinity of the inner peripheral edge of the substrate in the clamping area from the surface of the cover layer in the information recording area low. Further, according to the first problem-solving means of the present invention, the protrusion dimension h1 (eg, 120 μm) of the convex portion of the clamping area in the vicinity of the inner periphery of the substrate from the surface of the cover layer of the information recording area is determined. Since it is larger than the protruding protrusion h2 (eg, 50 μm) of the above-mentioned portion in the vicinity of the outer peripheral edge of the layer, when the substrate or the optical information recording medium is individually taken out from the loaded state, the lower substrate or the optical information It is possible to prevent an occurrence of a peeling error by providing a decompressed air chamber between the recording medium and the recording medium.

本発明の第２の課題解決手段においては、前記カバー層の外周縁の近傍の前記部の盛り上がりが前記カバー層と一体に形成されているのスピンコート法による形成時に設けられている。In the second problem-solving means of the present invention, the bulge of the portion in the vicinity of the outer peripheral edge of the cover layer is provided at the time of formation by a spin coating method in which it is formed integrally with the cover layer.
本発明の第２の課題解決手段によれば、前記カバー層の外周縁の近傍の前記部の盛り上がりが前記該カバー層と一体に形成され、スピンコート法による形成時に設けられるので、カバー層形成前には情報記録領域の表面からのクランピングエリア内前記基板の内周縁の近傍の凸部の突出寸法が大きく、このため基板積載時の傷つきをより効果的に防止することができる。  According to the second problem-solving means of the present invention, the bulge of the portion in the vicinity of the outer peripheral edge of the cover layer is formed integrally with the cover layer, and is provided at the time of formation by spin coating. Previously, the protruding dimension of the convex portion near the inner peripheral edge of the substrate in the clamping area from the surface of the information recording area is large, so that it is possible to more effectively prevent damage when the substrate is loaded.

本発明の第３の課題解決手段においては、前記基板の前記記録層が設けられる側の面とは反対の面側カバー層とは反対の面側にインク受理層を有するものである。In a third problem-solving means of the present invention, an ink receiving layer is provided on the surface of the substrate opposite to the surface-side cover layer opposite to the surface on which the recording layer is provided.
本発明の第３の課題解決手段によれば、前記基板の前記記録層が設けられる側の面カバー層とは反対の面側にインク受理層を有するので、インクジェットプリンタ等を用いてレーベル面の全域に亘って描画することができる。According to the third problem-solving means of the present invention, since the ink receiving layer is provided on the surface of the substrate opposite to the surface cover layer on the side where the recording layer is provided, the label surface can be formed using an inkjet printer or the like. It is possible to draw over the entire area.

本発明の光情報記録媒体によれば、光入射面の傷つきを防止し、剥離ミスが生じるのを防止することができ、レーベル面の描画性を低下させることなく描画領域の広い光情報記録媒体を提供することができる。本発明の前記目的とそれ以外の目的、構成特徴、作用効果は、以下の説明と添付図面によって明らかとなろう。 According to the optical information recording medium of the present invention, it is possible to prevent the light incident surface from being damaged, to prevent the occurrence of a peeling error, and to have a wide drawing area without deteriorating the drawing property of the label surface. Can be provided. The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

以下、本発明の光情報記録媒体の第１の実施形態について、図１を参照して説明する。図１は第１の実施形態の光情報記録媒体１０の内部構造の概要を示す部分拡大断面図である。尚、上記図１は光情報記録媒体１０の中心から右側半分の領域を示し、左側半分の領域を省略したものである。   Hereinafter, a first embodiment of the optical information recording medium of the present invention will be described with reference to FIG. FIG. 1 is a partially enlarged sectional view showing an outline of the internal structure of the optical information recording medium 10 of the first embodiment. FIG. 1 shows the right half area from the center of the optical information recording medium 10 and omits the left half area.

図１に示すように、中心に孔１１ａを有する基板１１上に記録層１３とカバー層１４とをこの順に有し、該カバー層１４側からレーザ光が照射されることで記録及び／又は再生が行われるを行うディスク状の光情報記録媒体１０である。   As shown in FIG. 1, a recording layer 13 and a cover layer 14 are provided in this order on a substrate 11 having a hole 11a in the center, and recording and / or reproduction is performed by irradiating laser light from the cover layer 14 side. Is a disc-shaped optical information recording medium 10 for performing the above.

具体的には、中心に孔１１ａを有する円板状の基板１１の上面には、プリグルーブ１１ｃが形成された情報記録領域Ａと、情報記録領域Ａよりも内周寄りに位置するクランピングエリアＢと、基板１１の内周縁の近傍で、クランピングエリアＢの内縁部近傍に位置する凸部１１ｂが形成されている。凸部１１ｂは基板１１が成型される際に、同時に成型されたものである。
基板１１のプリグルーブ１１ｃが形成された上面には、反射層１２、記録層１３及びカバー層１４がこの順に形成され、カバー層１４の外周縁の近傍の外周部Ｃには盛り上り部１４ｂが形成されている。
ここに、情報記録領域Ａは、基板１１の上面にトラッキングガイド用のプリグルーブプリグルーブ１１ｃが設けられた範囲内に、通常直径４６ｍｍないし直径１１７ｍｍの範囲に設けられている。
また、所謂クランピングエリアＢは、情報記録領域Ａより内周寄りに設けられ、通常、記録及び／又は再生時に該情報記録媒体を安定して保持するための平坦な領域であり、通常、中心孔１１ａからの直径２３ｍｍないし４４ｍｍ未満の範囲に形成される。
本実施形態において、基板１１の内周縁の近傍とは、クランピングエリアよりさらに内周寄りの領域を指す。また、基板１１およびカバー層１４の外周縁の近傍の外周部Ｃとは、情報記録領域Ａより外周寄りを指し、通常、直径１１７ｍｍからディスク最外周縁部（通常直径１２０ｍｍ）までの領域とされる。 More specifically, the upper surface of the disc-shaped substrate 11 having a hole 11a in the center, clamping area located on the inner circumference toward an information recording area A pregroove 11c is formed, than the information recording area A and B, in the vicinity of the inner peripheral edge of the substrate 11, the projecting portion 11b located on the inner edge near the clamping area B is formed. The protrusion 11b is formed at the same time when the substrate 11 is formed.
A reflective layer 12, a recording layer 13, and a cover layer 14 are formed in this order on the top surface of the substrate 11 where the pregroove 11c is formed, and a raised portion 14b is formed on the outer peripheral portion C near the outer peripheral edge of the cover layer 14. Is formed.
Here, the information recording area A, within which the pre-groove pregroove 11c is provided for tracking guide on the upper surface of the substrate 11, to not normally diameter 46mm is provided in a range of diameter 117 mm.
The so-called clamping area B is provided closer to the inner circumference than the information recording area A, and is usually a flat area for stably holding the information recording medium during recording and / or reproduction. The hole 11a is formed in a diameter range of 23 mm to less than 44 mm.
In the present embodiment, the vicinity of the inner periphery of the substrate 11 refers to a region closer to the inner periphery than the clamping area. Further, the outer peripheral portion C in the vicinity of the outer peripheral edge of the substrate 11 and the cover layer 14 is closer to the outer periphery than the information recording area A, and is usually an area from the diameter 117 mm to the outermost peripheral edge of the disc (normally 120 mm in diameter). The

本実施形態においては、クランピングエリアＢの内縁部近傍に形成された凸部１１ｂのカバー層１４の表面１４ａからの突出寸法ｈ１（例：１２０μｍ）は、基板１１およびカバー層１４の外周縁の近傍の外周部Ｃに設けられた盛り上がり部１４ｂのカバー層１４の表面１４ａからの突出寸法ｈ２（例：５０μｍ）より大きくなるように、凸部１１ｂおよび盛り上がり部１４ｂが形成されている。   In the present embodiment, the protruding dimension h1 (for example, 120 μm) of the convex portion 11b formed near the inner edge of the clamping area B from the surface 14a of the cover layer 14 is the outer peripheral edge of the substrate 11 and the cover layer 14. The convex portion 11b and the raised portion 14b are formed so as to be larger than the protruding dimension h2 (eg, 50 μm) of the raised portion 14b provided on the outer peripheral portion C in the vicinity from the surface 14a of the cover layer 14.

また、本実施形態においては、カバー層１４の外周縁の近傍の外周部Ｃに設けられた盛り上がり部１４ｂは、スピンコート法によって、カバー層１４を形成する際に、カバー層１４と一体的に形成されている。 In the present embodiment, the raised portion 14b provided on the outer peripheral portion C in the vicinity of the outer peripheral edge of the cover layer 14 is integrated with the cover layer 14 when the cover layer 14 is formed by spin coating. Is formed.

次に、上記基板１１の好ましい実施形態は次の通りである。すなわち、上記基板１１としては、従来の光情報記録媒体の基板材料として用いられている各種の材料を任意に選択して使用することができる。具体的には、ポリカーボネート、ポリメチルメタクリレート等のアクリル樹脂、ポリ塩化ビニル、塩化ビニル共重合体等の塩化ビニル系樹脂、エポキシ樹脂、アモルファスポリオレフィン、ポリエステル樹脂、アルミニウム等の金属、ガラス等を挙げることができ、必要によりこれらを併用してもよい。上記材料の中では、成型性、耐湿性、寸法安定性及び低価格等の点から熱可塑性樹脂が好ましく、ポリカーボネートが特に好ましい。
これらの樹脂を用いた場合には、射出成型法を用いて基板１１を作成することができる。また、上記基板１１の厚さは０．９〜１．６ｍｍの範囲とすることが好ましい。 Next, a preferred embodiment of the substrate 11 is as follows. That is, as the substrate 11, various materials used as substrate materials for conventional optical information recording media can be arbitrarily selected and used. Specific examples include acrylic resins such as polycarbonate and polymethyl methacrylate, vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymers, metals such as epoxy resins, amorphous polyolefins, polyester resins, and aluminum, and glass. These may be used together if necessary. Among the above materials, a thermoplastic resin is preferable from the viewpoint of moldability, moisture resistance, dimensional stability, and low price, and polycarbonate is particularly preferable.
When these resins are used, the substrate 11 can be formed using an injection molding method. The thickness of the substrate 11 is preferably in the range of 0.9 to 1.6 mm.

上記基板１１には、記録層１３が設けられる側の面に、トラッキングガイド用の凹凸である所謂プリグルーブ１１ｃが形成されている。また、プリグルーブ１１ｃのピッチは、通常５００ｎｍ以下であることが好ましい。 The substrate 11 has a so-called pregroove 11c, which is unevenness for tracking guide, formed on the surface on which the recording layer 13 is provided. Moreover, it is preferable that the pitch of the pregroove 11c is 500 nm or less normally.

次に、記録層１３の好ましい実施形態は次の通りである。すなわち、上記記録層１３としては、色素を記録物質として含有する色素型とすることが好ましいが、これに限定するものではなく、無機追記型（ライトワンス型）等とすることもできる。中でも、レーザ光照射によりピットが形成されデータが記録される色素型の記録層であることが好ましい。上記色素としては、フタロシアニン色素、シアニン色素、アゾ系色素等が好ましい。上記記録層１３には、上記レーザ光の照射により音楽や画像、コンピュータプログラム等のデータ情報を記録及び／又は再生することができる。また、上記記録層１３は、上記色素を結合剤等と共に適当な溶剤に溶解して塗布液を調製し、次いで、この塗布液を、基板１１上に直接または後述する光反射層１２上に、スピンコート法やスクリーン印刷法等により塗布して塗膜を形成した後、乾燥することにより形成される。 Next, a preferred embodiment of the recording layer 13 is as follows. That is, the recording layer 13 is preferably a dye type containing a dye as a recording substance, but is not limited thereto, and may be an inorganic write once type (write-once type) or the like. Among these, a dye-type recording layer in which pits are formed by laser beam irradiation and data is recorded is preferable. As the dye, a phthalocyanine dye, a cyanine dye, an azo dye, and the like are preferable. Data information such as music, images, and computer programs can be recorded and / or reproduced on the recording layer 13 by irradiation with the laser light. The recording layer 13 is prepared by dissolving the dye in a suitable solvent together with a binder or the like to prepare a coating solution, and then applying the coating solution directly on the substrate 11 or on the light reflecting layer 12 described later . It is formed by applying a spin coating method or screen printing method to form a coating film and then drying.

次に、上記カバー層１４の好ましい実施形態は次の通りである。すなわち、上記カバー層１４としては、透明な紫外線硬化性樹脂を適当な溶剤に溶解して塗布液を調整し、次いで、この塗布液を上記情報記録領域Ａより内周寄りのクランピングエリアＢから該情報記録領域Ａより外周寄りの領域外周部Ｃに亘って前記記録層１３上を覆うようにスピンコート法やスクリーン印刷法等により塗布して塗膜を形成した後、乾燥し、紫外線を照射することにより形成される。上記カバー層１４の厚みは通常４００ｎｍ〜５００ｎｍ付近の波長の青紫色のレーザ光が照射されて前記記録層にデータ記録／及びまたは前記記録層から再生されるように構成されるために、通常０．１ｍｍであることが好ましい。
尚、上記記録層１３と上記カバー層１４の間に、記録特性等の調整や接着性向上あるいは記録層の保護等を目的とした層を形成しても良い。この場合には、それらの層と記録層１３及びカバー層１４を合わせた厚さが０．１ｍｍ程度であることが好ましい。 Next, a preferred embodiment of the cover layer 14 is as follows. That is, as the cover layer 14, a transparent ultraviolet curable resin is dissolved in a suitable solvent to prepare a coating solution, and then the coating solution is removed from the clamping area B closer to the inner periphery than the information recording area A. A coating film is formed by spin coating or screen printing so as to cover the recording layer 13 over the outer periphery C of the area closer to the outer periphery than the information recording area A, and then dried and irradiated with ultraviolet rays. It is formed by doing. The thickness of the cover layer 14 is usually 0 because the recording layer is configured to be irradiated with a blue-violet laser beam having a wavelength in the vicinity of 400 nm to 500 nm to be recorded / reproduced from the recording layer. .1 mm is preferred.
It should be noted that a layer may be formed between the recording layer 13 and the cover layer 14 for the purpose of adjusting recording characteristics, improving adhesiveness, or protecting the recording layer. In this case, the total thickness of these layers, the recording layer 13 and the cover layer 14 is preferably about 0.1 mm.

次に、基板１１の内縁部近傍に形成された凸部１１ｂの好ましい実施形態は次の通りである。すなわち、凸部１１ｂは、プリグルーブ１１ｃが形成される基板１１の表面のクランピングエリアＢよりも内周寄りの基板１１の内縁部近傍に、前記基板１１と同時に成型されるのが好ましい。凸部１１ｂの基板１１の表面からの突出寸法は２２０μｍ以下が好ましく、凸部１１ｂの情報記録領域Ａに形成されたカバー層１４の表面１４ａからの突出寸法ｈ１は１２０μｍ以下が好ましい。 Next, a preferred embodiment of the convex portion 11b formed in the vicinity of the inner edge portion of the substrate 11 is as follows. That is, the convex portion 11b is preferably molded simultaneously with the substrate 11 in the vicinity of the inner edge of the substrate 11 closer to the inner periphery than the clamping area B on the surface of the substrate 11 on which the pregroove 11c is formed. The protrusion dimension of the protrusion 11b from the surface of the substrate 11 is preferably 220 μm or less, and the protrusion dimension h1 of the protrusion 11b from the surface 14a of the cover layer 14 formed in the information recording area A is preferably 120 μm or less.

次に、カバー層１４の外周縁の近傍の外周部Ｃに設けられた盛り上がり部１４ｂの好ましい実施形態は次のとおりである。すなわち、盛り上がり１４ｂは、情報記録領域Ａに形成されたカバー層１４の外周縁の近傍の外周部Ｃに設けられることが好ましく、スピンコート法によって、カバー層１４を形成する際に、同時に形成されることが好ましい。盛り上がり１４ｂのカバー層１４の表面１４ａからの突出寸法は５０μｍ以内であることが好ましい。
なお、特許文献２（特開２００５−１７４４０８号公報）に開示された光情報記録媒体においては、カバー層２０４の内周と外周とに同じ厚みの凸部が設けられているので、光情報記録媒体を重ねたときに、上側に位置する光情報記録媒体の基板の下面と、下側に位置する光情報記録媒体の情報記録領域Ａのカバー層２０４の表面と、カバー層２０４の内周側の凸部２０４ａと外周側の凸部２０４ｂとで囲まれる空間が生じる。このため、複数の光情報記録媒体が積載された状態から、最上部の光情報記録媒体を引き剥がそうとすると、下側の光情報記録媒体との間に減圧された気室が生じることになり、剥離ミスにより傷付きや落下等が生じやすかった。
これに対して、本実施形態においては、クランピングエリアＢの内縁部近傍に位置する凸部１１ｂの突出寸法ｈ１が、基板１１およびカバー層１４の外周縁の近傍の外周部Ｃに設けられた盛り上がり部１４ｂのカバー層１４の表面１４ａからの突出寸法ｈ２より大きくなるように、凸部１１ｂおよび盛り上がり部１４ｂが形成されているので、光情報記録媒体に多少の撓みが生じた場合でも、上下の光情報記録媒体にも同様の撓みを有するために、上側の光情報記録媒体の基板の下面と下側の光情報記録媒体のカバー層の外周縁の近傍部の盛り上がり部１４ｂとの接触が抑制され、特許文献２のように、閉じた空間が生じることが防止されるので、剥離ミスが生じるのを防止することができる。 Next, a preferred embodiment of the raised portion 14b provided on the outer peripheral portion C in the vicinity of the outer peripheral edge of the cover layer 14 is as follows. That is, the bulge 14b is preferably provided in the outer peripheral portion C in the vicinity of the outer peripheral edge of the cover layer 14 formed in the information recording area A, and is formed at the same time when the cover layer 14 is formed by spin coating. It is preferable. The projecting dimension of the bulge 14b from the surface 14a of the cover layer 14 is preferably within 50 μm.
In the optical information recording medium disclosed in Patent Document 2 (JP 2005-174408), the convex portion of the same thickness and the inner periphery and the outer periphery of the cover layer 204 is provided, the optical information recording When the medium is overlaid, the lower surface of the substrate of the optical information recording medium positioned on the upper side, the surface of the cover layer 204 in the information recording area A of the optical information recording medium positioned on the lower side, and the inner peripheral side of the cover layer 204 A space surrounded by the convex portion 204a and the convex portion 204b on the outer peripheral side is generated. For this reason, when an uppermost optical information recording medium is peeled off from a state where a plurality of optical information recording media are stacked, a decompressed air chamber is generated between the lower optical information recording medium and the lower optical information recording medium. It was easy to be damaged or dropped due to a peeling error.
On the other hand, in this embodiment, the protrusion dimension h1 of the convex part 11b located in the vicinity of the inner edge part of the clamping area B is provided in the outer peripheral part C in the vicinity of the outer peripheral edge of the substrate 11 and the cover layer 14. Since the convex portion 11b and the raised portion 14b are formed so as to be larger than the protruding dimension h2 from the surface 14a of the cover layer 14 of the raised portion 14b, even if some bending occurs in the optical information recording medium, in order to have the same deflection in the optical information recording medium, the contact between the raised portion 14b in the vicinity of the outer peripheral edge of the cover layer of the upper of the lower surface and the lower substrate of the optical information recording medium an optical information recording medium It is suppressed and, as in Patent Document 2, it is prevented that a closed space is generated, so that it is possible to prevent a peeling error from occurring.

次に、上記光反射層１２の好ましい実施形態は次のとおりである。上記光反射層１２はデータの記録および／または再生用のレーザ光を反射させるものであり、本発明においては、レーザ光に対する反射率を高めたり、記録再生特性を改良する機能を付与するために、基板１１と記録層１３との間に、必要により設けることが好ましい。上記光反射層１２としては、Ａｕ，Ａｌ，Ａｇ，ＣｕあるいはＰｄ等の金属膜、これらの金属の合金膜あるいはこれらの金属に微量成分が添加された合金膜等が好ましく、スパッタリングや真空蒸着等の手段により前記基板１１のプリグルーブ１１ｃが形成された面上に形成される。 Next, a preferred embodiment of the light reflecting layer 12 is as follows. The light reflecting layer 12 reflects laser light for recording and / or reproducing data. In the present invention, the light reflecting layer 12 is provided with a function of increasing the reflectance with respect to the laser light or improving the recording / reproducing characteristics. It is preferable to provide between the substrate 11 and the recording layer 13 as necessary. The light reflecting layer 12 is preferably a metal film such as Au, Al, Ag, Cu, or Pd, an alloy film of these metals, or an alloy film in which a trace component is added to these metals, or the like, such as sputtering or vacuum deposition. Thus, the substrate 11 is formed on the surface on which the pregroove 11c is formed.

次に、本発明の光情報記録媒体の第２の実施形態について、図２を参照して説明する。図２は第２の実施形態の光情報記録媒体２０の内部構造の概要を示す部分拡大断面図である。尚、上記図２は光情報記録媒体２０の中心から右側半分の領域を示し、左側半分の領域を省略したものである。 Next, a second embodiment of the optical information recording medium of the present invention will be described with reference to FIG. FIG. 2 is a partially enlarged cross-sectional view showing an outline of the internal structure of the optical information recording medium 20 of the second embodiment. 2 shows the right half region from the center of the optical information recording medium 20, and the left half region is omitted.

図２に示すように、中心に孔２１ａを有する基板２１上に、記録層２３と、カバー層２４と、をこの順に有し、該カバー層２４側からレーザ光が照射されることで記録及び／又は再生が行われるディスク状の光情報記録媒体２０である。   As shown in FIG. 2, a recording layer 23 and a cover layer 24 are provided in this order on a substrate 21 having a hole 21a in the center, and recording and recording are performed by irradiating laser light from the cover layer 24 side. This is a disc-shaped optical information recording medium 20 to be reproduced.

具体的には、中心に孔２１ａを有する円板状の基板２１の上面には、プリグルーブ２１ｃが形成された情報記録領域Ａと、情報記録領域Ａよりも内周寄りに位置するクランピングエリアＢと、基板２１の内周縁の近傍で、クランピングエリアＢの内縁部近傍に位置する凸部２１ｂが形成されている。凸部２１ｂは基板１１が成型される際に、同時に成型されたものである。
プリグルーブ２１ｃが形成された基板１１の上面には、反射層２２、記録層２３及びカバー層２４がこの順に形成され、カバー層１４の外周縁の近傍の外周部Ｃには盛り上り部２４ｂが形成されている。

More specifically, the upper surface of the disk-shaped substrate 21 having a hole 21a in the center, clamping area located on the inner circumference toward an information recording area A pregroove 21c is formed, than the information recording area A In the vicinity of B and the inner peripheral edge of the substrate 21, a convex portion 21 b located near the inner edge of the clamping area B is formed. Convex portion 21b when the substrate 11 is molded, in which molded simultaneously.
A reflective layer 22, a recording layer 23, and a cover layer 24 are formed in this order on the upper surface of the substrate 11 on which the pregroove 21c is formed, and a raised portion 24b is formed on the outer peripheral portion C in the vicinity of the outer peripheral edge of the cover layer 14. Is formed.

また、本実施形態においては、前記情報記録領域Ａのカバー層２４の表面２４ａからの前記基板の内周縁の近傍のクランピングエリアＢの凸部２１ｂの突出寸法ｈ１（例：１２０μｍ）を前記カバー層２４の外周縁の近傍の該カバー層２４部Ｃの盛り上がり２４ｂの突出寸法ｈ２（例：５０μｍ）より大きくしてある。 In the present embodiment, the protrusion dimension h1 (eg, 120 μm) of the convex portion 21b of the clamping area B in the vicinity of the inner peripheral edge of the substrate from the surface 24a of the cover layer 24 of the information recording area A is defined as the cover. The protrusion 24 h of the cover layer 24 part C in the vicinity of the outer peripheral edge of the layer 24 is larger than the protruding dimension h2 (for example, 50 μm).

また、本実施形態においては、前記カバー層２４の外周縁の近傍の前記部Ｃの盛り上がり２４ｂは前記該カバー層２４のスピンコート法による形成時に設けられた一体に形成されたものである。 In the present embodiment, the raised portion 24b of the portion C in the vicinity of the outer peripheral edge of the cover layer 24 is formed integrally with the cover layer 24 provided when the cover layer 24 is formed by spin coating.

本実施形態の光情報記録媒体２０は、前記基板２１の前記記録層２３が設けられる側の面とは反対の面側カバー層２４とは反対の面側にインク受理層２６を有する点で先の第１の実施形態とは異なる。具体的には本実施形態の光情報記録媒体２０は、前記基板２１の前記記録層２３が設けられる側の面カバー層２４とは反対の面側に下地層２５を介してインク受理層２６を有するものである。 The optical information recording medium 20 of the present embodiment is first provided with an ink receiving layer 26 on the surface side opposite to the surface side cover layer 24 opposite to the surface on which the recording layer 23 of the substrate 21 is provided. This is different from the first embodiment. Specifically, in the optical information recording medium 20 of the present embodiment, the ink receiving layer 26 is provided on the surface of the substrate 21 opposite to the surface cover layer 24 on the side where the recording layer 23 is provided via the base layer 25. It is what you have.

次に、上記下地層２５の好ましい実施形態は次の通りである。すなわち、上記下地層２５としては、紫外線硬化性樹脂と顔料とを主成分とするものが好ましく、例えば、紫外線硬化性樹脂と顔料とを含有する紫外線硬化型インクをスクリーン印刷法やスピンコート法等の手段により前記基板２１の前記記録層２３が設けられる側の面カバー層２４とは反対の面側に印刷し、その印刷膜を紫外線硬化させて形成することができる。この下地層２５は、上記基板２１及び後述するインク受理層２６が透明である場合に、前記反射層２２の金属光沢面が露出してしまうのを防止するために設けることが好ましい。 Next, a preferred embodiment of the base layer 25 is as follows. That is, the base layer 25 is preferably composed mainly of an ultraviolet curable resin and a pigment. For example, an ultraviolet curable ink containing an ultraviolet curable resin and a pigment is screen-printed or spin-coated. The substrate 21 is printed on the surface of the substrate 21 opposite to the surface cover layer 24 on the side where the recording layer 23 is provided, and the printed film is cured with ultraviolet rays. The base layer 25 is preferably provided to prevent the metallic glossy surface of the reflective layer 22 from being exposed when the substrate 21 and the ink receiving layer 26 described later are transparent.

次に、上記インク受理層２６の好ましい実施形態は次の通りである。すなわち、上記インク受理層２６としては、紫外線硬化性樹脂を主成分とするものが好ましく、例えば前記紫外線硬化性樹脂と、そのほかのバインダー成分と、粘度調整剤と、顔料及びその他の成分とを混合して得られる紫外線硬化型インクをスクリーン印刷法やスピンコート法等の手段により印刷し、ついで紫外線を照射することにより硬化させて、前記基板２１上に直接もしくは前述の下地層２５を介して形成される。
前記顔料としては、有機、無機の着色用顔料や、シリカ、アルミナ、水酸化アルミニウム、クレイ等の無機フィラー、あるいはアクリルビーズ、ナイロンビーズ、ゴム微粒子等の有機フィラー等が挙げられ、これらを単独種もしくは任意の複数種を併用してもよい。 Next, a preferred embodiment of the ink receiving layer 26 is as follows. That is, the ink receiving layer 26 preferably includes an ultraviolet curable resin as a main component, for example, the ultraviolet curable resin, other binder components, a viscosity modifier, a pigment, and other components are mixed. The ultraviolet curable ink thus obtained is printed by means such as a screen printing method or a spin coating method, and then cured by irradiating with ultraviolet rays, and is formed directly on the substrate 21 or through the above-described underlayer 25. Is done.
Examples of the pigment include organic and inorganic coloring pigments, inorganic fillers such as silica, alumina, aluminum hydroxide, and clay, or organic fillers such as acrylic beads, nylon beads, and rubber fine particles. Or you may use arbitrary multiple types together.

本発明の光情報記録媒体の第１の実施形態の内部構造の概要を示す部分拡大断面図である。It is a partial expanded sectional view which shows the outline | summary of the internal structure of 1st Embodiment of the optical information recording medium of this invention. 本発明の光情報記録媒体の第２の実施形態の内部構造の概要を示す部分拡大断面図である。It is a partial expanded sectional view which shows the outline | summary of the internal structure of 2nd Embodiment of the optical information recording medium of this invention. 背景技術を示す部分拡大断面図である。It is a partial expanded sectional view which shows background art. 背景技術を示す部分拡大断面図である。It is a partial expanded sectional view which shows background art.

符号の説明Explanation of symbols

１０：光情報記録媒体
１１：基板
１１ａ：中心孔
１１ｂ：凸部
１１ｃ：プリグルーブ
１２：反射層
１３：記録層
１４：カバー層
１４ａ：カバー層の表面
１４ｂ：盛り上がり
２０：光情報記録媒体
２１：基板
２１ａ：中心孔
２１ｂ：凸部
２１ｃ：プリグルーブ
２２：反射層
２３：記録層
２４：カバー層
２４ａ：カバー層の表面
２４ｂ：盛り上がり
２５：下地層
２６：インク受理層
Ａ：情報記録領域
Ｂ：クランピングエリア
Ｃ：外周領域部
ｈ１：突出寸法
ｈ２：突出寸法 10: Optical information recording medium 11: Substrate 11a: Center hole 11b: Convex portion 11c: Pregroove 12: Reflective layer 13: Recording layer 14: Cover layer 14a: Cover layer surface 14b: Swell 20: Optical information recording medium 21: Substrate 21a: Center hole 21b: Convex portion 21c: Pregroove 22: Reflective layer 23: Recording layer 24: Cover layer 24a: Cover layer surface 24b: Swell 25: Underlayer 26: Ink receiving layer A: Information recording area B: Clamping area C: outer peripheral area h1: protrusion dimension h2: protrusion dimension

Claims (3)

中心に孔を有する基板上に、記録層と、膜厚が０．１ｍｍのカバー層とをこの順に有し、前記カバー層側からレーザ光が照射されることで記録及び／又は再生が行われる光情報記録媒体において、
前記基板の前記記録層が設けられる側の表面に、プリグルーブを備えた情報記録領域と、前記情報記録領域より内周側に位置するクランピングエリアと、前記クランピングエリアよりも内周側に位置し、前記基板の成型と同時に形成され、前記カバー層の表面から突出する凸部と、前記情報記録領域の外側の前記カバー層に形成された盛り上がり部とが設けられ、
前記情報記録領域に形成された前記カバー層の表面から突出する前記凸部の高さｈ１が、前記カバー層の表面から突出する前記盛り上がり部の高さｈ２よりも大きい
ことを特徴とする光情報記録媒体。 On a substrate having a hole in the center, a recording layer, a thickness and a 0.1mm cover layer in this order, the recording and / or reproducing by a laser beam is irradiated from the cover layer side is performed In an optical information recording medium,
On the front surface of the side where the recording layer of the substrate are provided, and the information recording area having the pregroove, and clamping area located on the inner circumferential side of the information recording area, the inner peripheral side of the clamping area Is formed simultaneously with the molding of the substrate, and is provided with a protrusion protruding from the surface of the cover layer , and a raised portion formed in the cover layer outside the information recording area ,
The height h1 of the protrusion protruding from the surface of the cover layer formed in the information recording area is greater than the height h2 of the raised portion protruding from the surface of the cover layer. An optical information recording medium. 前記盛り上がり部が、前記カバー層をスピンコート法によって形成する際に、前記カバー層と一体的に形成されていることを特徴とする請求項１に記載の光情報記録媒体。 The optical information recording medium according to claim 1 , wherein the raised portion is formed integrally with the cover layer when the cover layer is formed by a spin coating method. さらに、前記カバー層および前記記録層が設けられる前記基板の面とは反対の面に、インク受理層を有することを特徴とする請求項１または２に記載の光情報記録媒体。 The optical information recording medium according to claim 1 , further comprising an ink receiving layer on a surface opposite to the surface of the substrate on which the cover layer and the recording layer are provided.
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JP2001167472A (en) * 1999-12-07 2001-06-22 Hitachi Maxell Ltd Optical disk and its manufacturing method
JP2003317334A (en) * 2002-04-24 2003-11-07 Sharp Corp Optical disk and method of manufacturing the same
JP2004039168A (en) * 2002-07-05 2004-02-05 Fuji Photo Film Co Ltd Optical disk
JP2006059454A (en) * 2004-08-20 2006-03-02 Sony Disc & Digital Solutions Inc Manufacture apparatus and method of optical recording medium
JP2006269052A (en) * 2005-02-22 2006-10-05 Ricoh Co Ltd Optical recording medium, method for optical recording, and optical recorder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0757297A (en) * 1993-08-13 1995-03-03 Sony Corp Optical disk
JPH10208297A (en) * 1997-01-22 1998-08-07 Sony Corp Optical disk substrate
JP2001167472A (en) * 1999-12-07 2001-06-22 Hitachi Maxell Ltd Optical disk and its manufacturing method
JP2003317334A (en) * 2002-04-24 2003-11-07 Sharp Corp Optical disk and method of manufacturing the same
JP2004039168A (en) * 2002-07-05 2004-02-05 Fuji Photo Film Co Ltd Optical disk
JP2006059454A (en) * 2004-08-20 2006-03-02 Sony Disc & Digital Solutions Inc Manufacture apparatus and method of optical recording medium
JP2006269052A (en) * 2005-02-22 2006-10-05 Ricoh Co Ltd Optical recording medium, method for optical recording, and optical recorder

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