JPH0628715A - Optical recording medium - Google Patents

Optical recording medium

Info

Publication number
JPH0628715A
JPH0628715A JP5091610A JP9161093A JPH0628715A JP H0628715 A JPH0628715 A JP H0628715A JP 5091610 A JP5091610 A JP 5091610A JP 9161093 A JP9161093 A JP 9161093A JP H0628715 A JPH0628715 A JP H0628715A
Authority
JP
Japan
Prior art keywords
hydrophobic
resin
optical recording
recording medium
hard coat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5091610A
Other languages
Japanese (ja)
Inventor
Masaru Egawa
川 優 江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to JP56161581A priority Critical patent/JPS5862841A/en
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP5091610A priority patent/JPH0628715A/en
Priority to JP5091609A priority patent/JPH0652580A/en
Publication of JPH0628715A publication Critical patent/JPH0628715A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material

Landscapes

  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

PURPOSE:To improve not only scratching resistance but moisture permeation resistance as well, to effectively prevent the deterioration of recording layers and to improve reliability and durability by forming hard coating layers on the outside field surface sides of base materials. CONSTITUTION:The recording layer having track grooves 5 are formed on the base material 1 consisting of a thermoplastic resin. The hydrophobic hard coating layer 2 is formed on the surface on the side of the base material 1 where the recording layer 3 is not formed and the side where the base material comes into direct contact with the outside field. Further, the similar constitution is disposed on the rear side of the disk as well. Both are combined and integrated via a spacer 4, by which the both-side memory disk is formed. The hard coating layers 2 are formed by coating the base materials with hydrophobic resins, such as silicone resin, acrylic resin, melamine resin, the copolymers thereof or mixtures thereof, or compsn. imparted with a hydrophobic property by introducing hydrophobic groups to the resins having the hydrophobic property or adding hydrophobic materials thereto.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、少なくとも読取り方式
を光学的に行う光記録媒体、たとえば、デジタル・オー
ディオ・ディスク、ビデオディスク、メモリーディス
ク、光磁気ディスク等の光記録媒体に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium which optically performs at least a reading method, for example, an optical recording medium such as a digital audio disc, a video disc, a memory disc and a magneto-optical disc.

【0002】[0002]

【従来の技術および発明が解決しようとする課題】メモ
リーディスクを例にとって現状を説明すると、現在、メ
モリーディスク材料としては、ガラス、アクリル樹脂あ
るいはカーボネート樹脂が研究材料として検討課題にの
ぼっている。ところで、このようなディスク材料とし
て、ガラスを使用する場合においては、耐湿性を含めた
耐久性にすぐれているためガラス基材上に形成された記
録層への悪影響は少ないが、反面、重量が重くなるこ
と、間違って落下させた場合容易に割れてしまい記録デ
ータが修復不可能になってしまうこと、ガラスへのピッ
ト情報などの精密加工が比較的繁雑でコスト的にも高価
になるという問題がある。
2. Description of the Related Art The present situation will be described by taking a memory disk as an example. At present, as a memory disk material, glass, acrylic resin or carbonate resin is a subject for study. By the way, when glass is used as such a disc material, since it has excellent durability including moisture resistance, it has little adverse effect on the recording layer formed on the glass substrate, but on the other hand, it has a large weight. The problem is that it becomes heavy, it breaks easily if dropped by mistake, and the recorded data cannot be restored. Precision processing such as pit information on the glass is relatively complicated and costly. There is.

【0003】一方、アクリル樹脂やカーボネート樹脂等
の有機樹脂製材料は可撓性に富み割れにくく、価格が安
い等のメリットはあるものの、ガラスに比べて傷がつき
易く、また湿度や外気からの影響によって、その表面に
形成された記録層が劣化しやすくなるという問題があ
る。
On the other hand, organic resin materials such as acrylic resins and carbonate resins have the advantages that they are highly flexible and difficult to crack, and are inexpensive, but they are more susceptible to scratching than glass and are more susceptible to humidity and outside air. Due to the influence, there is a problem that the recording layer formed on the surface is easily deteriorated.

【0004】[0004]

【課題を解決しようとする手段】本発明者らの知見によ
れば、上述したような光記録媒体上に形成された記録層
の劣化の原因について研究したところ、記録層の外表面
側から侵入する水分もさることながら、むしろ基材の裏
側(外界に接触する側であって記録層が存在しない側)
から基材を介入して侵入する外気中の水分が基材中にお
いて加水分解などに起因する欠陥を形成し、この欠陥に
よって基板のみらなずその表面に形成された記録層を結
果的に劣化させているという予想外の知見を得るに至っ
た。
According to the knowledge of the present inventors, when the cause of the deterioration of the recording layer formed on the optical recording medium as described above was studied, the intrusion from the outer surface side of the recording layer occurred. Not only the water content, but also the back side of the substrate (the side that contacts the outside world and has no recording layer)
Moisture in the outside air that penetrates through the base material from the inside forms defects due to hydrolysis in the base material, and as a result, not only the substrate but also the recording layer formed on the surface deteriorates due to the defects. We have come to the unexpected finding that we are doing.

【0005】本発明は上述した知見に基づいてなされた
ものであり、光記録媒体の基材を構成するプラスチック
材料の軽量性、コストの低廉性を最大限に生かしなが
ら、媒体表面の耐擦傷性を向上させるとともに、特に基
材中に侵入した水分によって引起こされる加水分解など
に起因する欠陥ならびにこの欠陥による記録層の劣化を
効果的に防止し、信頼性と耐久性にすぐれた光記録媒体
を提供することを目的としている。
The present invention has been made on the basis of the above-mentioned findings, and while maximizing the light weight and low cost of the plastic material constituting the base material of the optical recording medium, the scratch resistance of the medium surface is improved. And an optical recording medium having excellent reliability and durability, which effectively prevents defects caused by hydrolysis caused by moisture that has penetrated into the base material and deterioration of the recording layer due to these defects. Is intended to provide.

【0006】上述した目的を達成するために、本発明に
よる光記録媒体は、少なくとも読取り方式に光を用いる
光記録媒体において、透明有機樹脂からなる基板と、前
記基板上に形成された光記録層とを有し、さらに前記光
記録層が形成されていない側の基板上であって、外界と
直接接する側の面に、疎水性の物質を含むハードコート
層を形成したことを特徴としている。
In order to achieve the above-mentioned object, an optical recording medium according to the present invention is an optical recording medium which uses light for at least a reading method, and a substrate made of a transparent organic resin and an optical recording layer formed on the substrate. And a hard coat layer containing a hydrophobic substance is formed on the surface of the substrate on which the optical recording layer is not formed and which is in direct contact with the outside.

【0007】このように、本発明においては、光記録層
が形成されていない側の基板上であって外界と直接接す
る側の面に疎水性ハードコート層を形成するようにした
ので、外界から基材中に侵入した水分によって引起こさ
れる加水分解などに起因する欠陥ならびにこの欠陥によ
る記録層の劣化を効果的に防止することができるととも
に、媒体表面の耐摩傷性を向上させる上ですぐれた効果
を奏する。
As described above, according to the present invention, the hydrophobic hard coat layer is formed on the surface of the substrate on which the optical recording layer is not formed and which is in direct contact with the outside world. It is possible to effectively prevent defects caused by hydrolysis caused by water that has penetrated into the base material and deterioration of the recording layer due to these defects, and it is excellent in improving the abrasion resistance of the medium surface. Produce an effect.

【0008】以下、本発明を添付図面に例示したメモリ
ーディスクの構成に基づいて具体的に説明する。
The present invention will be described in detail below based on the structure of the memory disk illustrated in the accompanying drawings.

【0009】第1図は中心線に沿って切断したメモリー
ディスクの断面図であり、ディスクの両面に記録層を形
成した場合の例である。図示のように、熱可塑性樹脂か
らなる基材1上にトラック溝5を有する記録層3が形成
される一方、基材1の記録層が形成されていない側であ
って外界と直接接する側の面に疎水性のハードコート層
2が形成されている。さらにディスクの裏面側にも同様
の構成のものが配置され、両者はスペーサー4を介して
接合一体化されている。
FIG. 1 is a cross-sectional view of a memory disk taken along the center line, and shows an example in which recording layers are formed on both surfaces of the disk. As shown, the recording layer 3 having the track grooves 5 is formed on the base material 1 made of a thermoplastic resin, while the side of the base material 1 on which the recording layer is not formed and which is in direct contact with the outside world. A hydrophobic hard coat layer 2 is formed on the surface. Further, a similar structure is arranged on the back side of the disk, and both are joined and integrated via a spacer 4.

【0010】基材1としては、アリルジグリコールカー
ボネート樹脂などのカーボネート樹脂、塩化ビニル樹
脂、あるいはメチルメタクリレート樹脂のようなアクリ
ル樹脂、あるいはポリオレフィン樹脂などが好ましく用
いられ得る。
As the base material 1, carbonate resins such as allyl diglycol carbonate resins, vinyl chloride resins, acrylic resins such as methyl methacrylate resins, or polyolefin resins can be preferably used.

【0011】一方、本発明におけるハードコート層2は
疎水性を有するものであって、構成材料自体が疎水性物
質である場合の他、疎水性基を有する物質を含有させる
ことによってハードコート層に疎水性を付与することも
できる。具体的には、シリコーン樹脂、アクリル樹脂、
メラミン樹脂、あるいはこれらの共重合体、またはこれ
らの混合物などの疎水性樹脂、あるいは疎水性を有する
樹脂に疎水性基を導入したり、疎水性物質を添加するな
どして疎水性を付与した組成物をコーティング組成物と
することもできる。
On the other hand, the hard coat layer 2 according to the present invention has hydrophobicity, and the hard coat layer can be formed by incorporating a substance having a hydrophobic group in addition to the case where the constituent material itself is a hydrophobic substance. Hydrophobicity can also be imparted. Specifically, silicone resin, acrylic resin,
A composition in which a hydrophobic group is introduced into a hydrophobic resin such as a melamine resin, a copolymer thereof, a mixture thereof, or a resin having hydrophobicity, or a hydrophobic substance is added to impart hydrophobicity to the resin. The thing can also be used as a coating composition.

【0012】また、上記ハードコート層のコーティング
組成物としては、硬化剤、硬化促進剤、重合開始剤など
の追加的成分を適宜添加することができる。
Further, as the coating composition for the hard coat layer, additional components such as a curing agent, a curing accelerator, and a polymerization initiator can be appropriately added.

【0013】上述したハードコート層は、所定の組成の
塗布駅をディッピングやスピナー法などの方法により塗
布したのち、紫外線などの硬化手段により硬化物とし、
これによりハードコート層を形成する。
The above-mentioned hard coat layer is formed into a cured product by coating the coating station of a predetermined composition by a method such as dipping or a spinner method, and then curing it by a curing means such as ultraviolet rays.
This forms a hard coat layer.

【0014】第2図は疎水性ハードコート層7を基材6
の表面にディッピングで塗布形成した場合の例であり、
この場合の記録層は、たとえば紫外線硬化性樹脂からな
る層8の表面にトラック溝9を形成することにより記録
層11を構成している。
FIG. 2 shows the substrate 6 with the hydrophobic hard coat layer 7
It is an example of applying and forming on the surface of
In this case, the recording layer constitutes the recording layer 11 by forming the track groove 9 on the surface of the layer 8 made of, for example, an ultraviolet curable resin.

【0015】上記のように、第1図の場合は、射出成形
によってトラッキング加工まで可能な材料を使用してい
るため、ハードコート層は、スピナー法によって基剤の
片面のみ(外界と接する側)に形成した場合の態様であ
り、第2図の場合には、ディッピング法により基剤の表
面にハードコート層を形成した場合の例であり、この場
合は紫外線硬化性樹脂層を用いてトラッキング加工を施
して記録層とした場合の例である。
As described above, in the case of FIG. 1, since a material that can be subjected to tracking processing by injection molding is used, the hard coat layer is formed on only one side of the base by the spinner method (on the side in contact with the outside). 2 is an example in which a hard coat layer is formed on the surface of the base by a dipping method in the case of FIG. 2, and in this case, tracking processing is performed using an ultraviolet curable resin layer. This is an example of the case where the recording layer is formed by applying.

【0016】上記のように、本発明においては、記録層
が形成されていない側の基板上であって外界と直接接す
る側の面に疎水性ハードコート層を形成するようにした
ので、外界から基剤中に侵入した水分によって引起こさ
れる加水分解などに起因する欠陥ならびにこの欠陥によ
る記録層の劣化を効果的に防止することができるととも
に、媒体表面の耐擦傷性を向上させることができ、これ
によりガラス製の光記録媒体に比べて製作コストの低廉
化を図ることができ、しかもガラスに匹敵する長期信頼
性のある光記録媒体を提供することが可能となる。
As described above, according to the present invention, since the hydrophobic hard coat layer is formed on the surface of the substrate on which the recording layer is not formed and which is in direct contact with the external environment, the external hard surface is formed. It is possible to effectively prevent defects caused by hydrolysis or the like caused by water that has penetrated into the base material and deterioration of the recording layer due to these defects, and improve scratch resistance of the medium surface, As a result, it is possible to reduce the manufacturing cost as compared with an optical recording medium made of glass, and it is possible to provide an optical recording medium having long-term reliability comparable to glass.

【0017】[0017]

【実施例】以下、本発明の実施例を例示的に記載する
が、本発明はこれら実施例の記載の制限されるものでは
ない。実施例1 メチルメタクリレート樹脂を射出成形方により加工し、
第1図に示すように、片面にトラッキング加工(必要に
応じてこの段階でピットを形成することも可能)したデ
ィスク基材1のトラッキング加工されていない面(外界
側)に、テトラメチロールメタンデトラアクリレート5
0部とトリメチレングリコールジメタリクレート30部
とベンゾインエーテル3部とからなる組成の塗布液をス
ピナーにより塗布した。塗布液組成物の前半の2成分は
疎水性樹脂である。
EXAMPLES Examples of the present invention will be described below as examples, but the present invention is not limited to the description of these examples. Example 1 A methyl methacrylate resin was processed by an injection molding method,
As shown in FIG. 1, the surface of the disk substrate 1 on which tracking processing has been performed on one surface (pits can be formed at this stage if necessary) on the non-tracking surface (outside) is tetramethylolmethane Traacrylate 5
A coating solution having a composition of 0 part, 30 parts trimethylene glycol dimethacrylate and 3 parts benzoin ether was applied by a spinner. The first two components of the coating liquid composition are hydrophobic resins.

【0018】塗布後、紫外線重合装置によりこれを硬化
させて疎水性のハードコート層2を形成した。実施例2 塩化ビニルを射出成形法により加工し、第1図に示すよ
うに、片面にトラッキング加工とピット加工を施した。
さらにディスク基材1のトラッキング加工を施さない面
に、ヘキサメトキシメラミン60部と1‐4ブタンジオ
ール40部とからなる溶液のプレポリマーをエチルセル
ソルブに希釈させた後、スピナーによりこれを塗布し、
しかる後、これを硬化させて疎水性のハードコート層2
を形成した。実施例3 アリルジグリコールカーボネート樹脂を用いて第2図に
示すように加工されたディスクの表面に、テトラエトキ
シシラン20部とγグリシドオキシプロピルトリメトキ
シシラン10部とイソプロピルアルコール20部とギ酸
(90%)30部とからなる溶液をディッピングにより
塗布した後、恒温層で塗膜を加熱硬化させて疎水性のハ
ードコート層を形成した。溶液構成物の内、最初のもの
は疎水性を有する物質である。実施例4 アリルジグリコールカーボネート樹脂を用いて第2図に
示すように加工されたディスクの表面に、デトラエトキ
シシラン40部とγメタクリルオキシプロピルトリメト
キシシラン30部とメチルトリメトキシシラン10部を
0.05Nの塩酸で加水分解させた後、イソプロピルア
ルコールに溶かした液に、ディッピングにより塗布した
後、恒温槽で塗膜を加熱硬化させて疎水性のハードコー
ト層を形成した。比較例1〜3 比較例として、実施例1〜3において、各々、ディスク
の外界側の表面にハードコート層を形成しないものを用
意した。実施例5〜8 第1図および第2図に示す媒体構造において、片面のみ
のもの(すなわちスペーサー4を介して2枚のディスク
を合体させる前のもの)を用意し、このディスクの記録
層(トラッキング加工)上に各々疎水性のハードコート
層を形成し、これを試験用ディスクとした。実施例5〜
8に対応するハードコート層の材料は、それぞれ実施例
1〜4に対応する。比較例4〜6 上記実施例5〜7において、各ディスクの記録層(トラ
ッキング加工面)側の表面のみにハードコート層が形成
され、ディスクの外界側の表面にはハードコート層が形
成されていないものを用意し、これを試験用ディスクと
した。試験例 実施例1〜8および比較例1〜6で得られたメモリーデ
ィスクについて、耐擦傷性テスト、耐透湿性テスト、な
らびに記録層の劣化特性テストを行った。試験結果を下
記第1表に示す。
After coating, the composition was cured by an ultraviolet polymerization device to form a hydrophobic hard coat layer 2. Example 2 Vinyl chloride was processed by an injection molding method, and as shown in FIG. 1, one surface was subjected to tracking processing and pit processing.
Further, a prepolymer of a solution consisting of 60 parts of hexamethoxymelamine and 40 parts of 1-4 butanediol was diluted with ethyl cellosolve on the surface of the disk substrate 1 which was not subjected to tracking processing, and this was applied with a spinner. ,
After that, it is cured to give a hydrophobic hard coat layer 2
Was formed. Example 3 20 parts of tetraethoxysilane, 10 parts of γ-glycidoxypropyltrimethoxysilane, 20 parts of isopropyl alcohol, and formic acid (formic acid were added to the surface of a disk processed as shown in FIG. 2 using an allyl diglycol carbonate resin. 90%) 30 parts of a solution was applied by dipping, and then the coating film was heat-cured in a constant temperature layer to form a hydrophobic hard coat layer. The first of the solution components is a substance having hydrophobicity. Example 4 40 parts of detraethoxysilane, 30 parts of γ-methacryloxypropyltrimethoxysilane and 10 parts of methyltrimethoxysilane were formed on the surface of a disk processed using an allyl diglycol carbonate resin as shown in FIG. After being hydrolyzed with 0.05N hydrochloric acid, it was applied by dipping on a solution dissolved in isopropyl alcohol, and then the coating film was heat-cured in a constant temperature bath to form a hydrophobic hard coat layer. Comparative Examples 1 to 3 As comparative examples, those prepared in Examples 1 to 3 in which no hard coat layer was formed on the outer surface of the disk were prepared. Examples 5 to 8 In the medium structure shown in FIGS. 1 and 2, one having only one side (that is, one before joining two discs via the spacer 4) was prepared, and the recording layer of this disc ( Hydrophobic hard coat layers were formed on (tracking processing), and this was used as a test disk. Example 5
The material of the hard coat layer corresponding to No. 8 corresponds to Examples 1 to 4, respectively. Comparative Examples 4 to 6 In the above Examples 5 to 7, the hard coat layer was formed only on the recording layer (tracking surface) side surface of each disc, and the hard coat layer was formed on the outer side surface of the disc. A non-existent disc was prepared and used as a test disc. Test Example The memory disks obtained in Examples 1 to 8 and Comparative Examples 1 to 6 were subjected to a scratch resistance test, a moisture resistance test, and a recording layer deterioration property test. The test results are shown in Table 1 below.

【0019】第1表 耐擦傷性 耐透湿性 劣化指数 実施例1 88% 1.4 2.8 実施例2 80% 2.3 4.6 実施例3 92% 0.6 1.0 実施例4 92% 0.6 1.0 比較例1 40% 2.2 4.4 比較例2 25% 3.0 6.0 比較例3 85% 1.0 2.0 実施例5 88% 1.4 3.1 実施例6 80% 2.3 5.1 実施例7 92% 0.6 1.1 実施例8 92% 0.6 1.1 比較例4 40% 2.2 4.8 比較例5 25% 3.0 6.6比較例6 85% 1.0 2.2 試験方法: (1) 耐擦傷性 #000のスチールウールに1kg/cm2 の荷重をかけ、
10往復した後の光線透過率を測定する。 (2) 耐透湿性 20℃、70%RHの恒温恒湿槽に、一面を試験片に、
他面をすべて透湿しない金属製の箱をおき、その中に乾
燥したKClを入れて、透湿後の重量変化を測定し、ハ
ードコート層を有さないアリルジグリコールカーボネー
ト樹脂基材の透湿後の重量を1とした時の相対値。 (3) 劣化指数 70℃、90%RHの恒温恒湿槽に試験対象ディスクを
500時間投入し、投入前後における記録層に発生した
欠陥の発生率(Defect Error Rate)
を測定した。これは、記録層に3.7MHz(ディスク
回転数1800rpm)の信号を記録し、同様に読み出
したものである。劣化指数の値は、恒温恒湿槽への投入
前の欠陥発生率を1とした時の相対値である。
Table 1 Example Scratch resistance Moisture permeability resistance Degradation index Example 1 88% 1.4 2.8 Example 2 80% 2.3 4.6 Example 3 92% 0.6 1.0 Example 4 92% 0.6 1.0 Comparative Example 1 40% 2.2 4.4 Comparative Example 2 25% 3.0 6.0 Comparative Example 3 85% 1.0 2.0 Example 5 88% 1.4 3.1 Example 6 80% 2.3 5.1 Example 7 92% 0.6 1.1 Example 8 92% 0.6 1.1 Comparative Example 4 40% 2.2 4.8 Comparative Example 5 25% 3.0 6.6 Comparative Example 6 85% 1.0 2.2 Test method: (1) Scratch resistance A steel wool of # 000 is loaded with a load of 1 kg / cm 2 .
The light transmittance after 10 round trips is measured. (2) Moisture vapor resistance 20 ° C, 70% RH in a constant temperature and humidity chamber, one side of the test piece,
Place a metal box on all other surfaces that does not allow moisture to pass through, put dry KCl in it, and measure the weight change after moisture transmission to measure the permeability of the allyl diglycol carbonate resin substrate without a hard coat layer. Relative value when the weight after wetting is 1. (3) Degradation index The test disk was put in a thermo-hygrostat at 70 ° C. and 90% RH for 500 hours, and the occurrence rate of defects in the recording layer before and after the loading (Defect Error Rate).
Was measured. This is one in which a signal of 3.7 MHz (disk rotation speed 1800 rpm) was recorded on the recording layer and read in the same manner. The value of the deterioration index is a relative value when the defect occurrence rate before introduction into the constant temperature and constant humidity tank is 1.

【0020】上記結果からもわかる通り、本発明によれ
ばハードコート層を基材の外界表面側に形成することに
より、耐擦傷性のみならず耐透湿性を向上させることが
できるとともに記録層の劣化特性をすぐれたものにする
ことができ、安価な材料で、信頼性の高い光記録媒体を
提供することができる。なお、上記の実施例において
は、メモリーディスクを例にとって説明したが、デジタ
ルオーディオディスク、ビデオディスク、光磁気ディス
クなどにおいても同様にして信頼性、耐久性にすぐれた
光記録媒体を提供することができる。
As can be seen from the above results, according to the present invention, not only the scratch resistance but also the moisture permeation resistance can be improved and the recording layer of the recording layer can be formed by forming the hard coat layer on the outer surface side of the substrate. It is possible to provide an optical recording medium that has excellent deterioration characteristics, is inexpensive, and has high reliability. In the above embodiments, the memory disk has been described as an example, but it is possible to provide an optical recording medium having excellent reliability and durability in a digital audio disk, a video disk, a magneto-optical disk and the like. it can.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例に係るメモリーディスクの断面
模式図。
FIG. 1 is a schematic sectional view of a memory disk according to an embodiment of the present invention.

【図2】本発明の実施例に係るメモリーディスクの断面
模式図。
FIG. 2 is a schematic sectional view of a memory disk according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 基材 2 ハードコート層 3 記録層 4 スペーサー 5 トラック溝 6 基材 7 ハードコート層 8 トラッキング溝(信号ピットを含むこともある)形
成樹脂層 9 トラック溝 10 スペーサー 11 記録層
DESCRIPTION OF SYMBOLS 1 Base material 2 Hard coat layer 3 Recording layer 4 Spacer 5 Track groove 6 Base material 7 Hard coat layer 8 Tracking groove (sometimes including signal pit) forming resin layer 9 Track groove 10 Spacer 11 Recording layer

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】少なくとも読取り方式に光を用いる光記録
媒体において、 透明有機樹脂からなる基板と、前記基板の一方の側面に
形成された光記録層とを有し、さらに前記光記録層が形
成されていない側の前記基板の他方の面側であって外界
と直接接する側の面に、疎水性の物質を含むハードコー
ト層を形成したことを特徴とする、光記録媒体。
1. An optical recording medium using light for at least a reading method, which has a substrate made of a transparent organic resin and an optical recording layer formed on one side surface of the substrate, and further the optical recording layer is formed. An optical recording medium, characterized in that a hard coat layer containing a hydrophobic substance is formed on the surface of the other surface of the substrate which is not covered with the film and which is in direct contact with the outside.
【請求項2】前記ハードコート層が、紫外線による硬化
物からなる、請求項1に記載の光記録媒体。
2. The optical recording medium according to claim 1, wherein the hard coat layer is made of a cured product by ultraviolet rays.
【請求項3】前記基板を構成する透明有機樹脂が、カー
ボネート樹脂、塩化ビニル樹脂またはアクリル樹脂から
なる、請求項1に記載の光記録媒体。
3. The optical recording medium according to claim 1, wherein the transparent organic resin forming the substrate is made of a carbonate resin, a vinyl chloride resin or an acrylic resin.
【請求項4】前記ハードコート層が、シリコーン樹脂、
アクリル樹脂、メラミン樹脂またはこれらの混合物を含
む硬化物からなる、請求項1に記載の光記録媒体。
4. The hard coat layer is a silicone resin,
The optical recording medium according to claim 1, comprising a cured product containing an acrylic resin, a melamine resin, or a mixture thereof.
JP5091610A 1981-10-09 1993-04-19 Optical recording medium Pending JPH0628715A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56161581A JPS5862841A (en) 1981-10-09 1981-10-09 Disc material
JP5091610A JPH0628715A (en) 1981-10-09 1993-04-19 Optical recording medium
JP5091609A JPH0652580A (en) 1981-10-09 1993-04-19 Manufacture of optical recording medium

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP56161581A JPS5862841A (en) 1981-10-09 1981-10-09 Disc material
JP5091610A JPH0628715A (en) 1981-10-09 1993-04-19 Optical recording medium
JP5091609A JPH0652580A (en) 1981-10-09 1993-04-19 Manufacture of optical recording medium

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP56161581A Division JPS5862841A (en) 1981-10-09 1981-10-09 Disc material

Publications (1)

Publication Number Publication Date
JPH0628715A true JPH0628715A (en) 1994-02-04

Family

ID=27306795

Family Applications (3)

Application Number Title Priority Date Filing Date
JP56161581A Pending JPS5862841A (en) 1981-10-09 1981-10-09 Disc material
JP5091610A Pending JPH0628715A (en) 1981-10-09 1993-04-19 Optical recording medium
JP5091609A Pending JPH0652580A (en) 1981-10-09 1993-04-19 Manufacture of optical recording medium

Family Applications Before (1)

Application Number Title Priority Date Filing Date
JP56161581A Pending JPS5862841A (en) 1981-10-09 1981-10-09 Disc material

Family Applications After (1)

Application Number Title Priority Date Filing Date
JP5091609A Pending JPH0652580A (en) 1981-10-09 1993-04-19 Manufacture of optical recording medium

Country Status (1)

Country Link
JP (3) JPS5862841A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7884313B2 (en) 2005-06-28 2011-02-08 Robert Bosch Gmbh Sensor arrangement for detecting a liquid on a surface of an intrusion detector

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62129952A (en) * 1985-11-30 1987-06-12 Hitachi Maxell Ltd Information recording disk
JPS637531A (en) * 1986-06-25 1988-01-13 Dainippon Printing Co Ltd Protective film for optical information recording medium
JPH0754591B2 (en) * 1986-09-11 1995-06-07 セイコーエプソン株式会社 Optical recording medium
JP3611438B2 (en) 1997-12-24 2005-01-19 Tdk株式会社 Optical recording medium and manufacturing method thereof
JP2008217980A (en) * 2000-06-28 2008-09-18 Tdk Corp Evaluation method of optical information medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531002A (en) * 1976-05-13 1978-01-07 Philips Corp Radiation sensitive record
JPS5538655A (en) * 1978-09-08 1980-03-18 Sumitomo Chem Co Ltd Optical signal recording and reproducing member

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5164255A (en) * 1974-11-29 1976-06-03 Kito Kk Nyakukikai niokeru kafuka nitaisuru hoansochi
JPS5621890A (en) * 1979-07-31 1981-02-28 Toshiba Corp Optical recording material
JPS5690439A (en) * 1979-12-20 1981-07-22 Sumitomo Chem Co Ltd Material for reproducing optical signal records
JPS57172537A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531002A (en) * 1976-05-13 1978-01-07 Philips Corp Radiation sensitive record
JPS5538655A (en) * 1978-09-08 1980-03-18 Sumitomo Chem Co Ltd Optical signal recording and reproducing member

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7884313B2 (en) 2005-06-28 2011-02-08 Robert Bosch Gmbh Sensor arrangement for detecting a liquid on a surface of an intrusion detector

Also Published As

Publication number Publication date
JPS5862841A (en) 1983-04-14
JPH0652580A (en) 1994-02-25

Similar Documents

Publication Publication Date Title
US5020048A (en) Optical information recording medium having a protective film which can be stripped
US4340655A (en) Thermal and mechanical barrier layers for optical recording elements
JPS6397627A (en) Optical information recording medium
JP2517341B2 (en) Method for manufacturing optical information recording disk
JPH02226533A (en) Information recording medium
JPH0628715A (en) Optical recording medium
JPH05135408A (en) Optical disk
JPH02304741A (en) Optical disk and its production
JPS6243846A (en) Optical recording disk
JPS60121549A (en) Information recording carrier
JPH07109657B2 (en) Light disk
JPS6037700Y2 (en) Structure of disk record
JPH02304742A (en) Optical disk and its production
JPH03263625A (en) Medium for recording information
JPH07186538A (en) Optical recording material
JPS60261046A (en) Method for forming protection curing coating film for optical disc
JPS63259854A (en) Optical information recording method and optical information recording medium
US5102739A (en) Low temperature, aqueous ammonia treatment for polycarbonate substrates and optical information media employing same
JPH02162547A (en) Production of optical disk
JPH06295470A (en) Optical disk
JPS63100633A (en) Optical disk carrier
JPH01109551A (en) Optical card
JPS61258351A (en) Optical disk
JPH08263878A (en) Optical disk and its production
JPH0778355A (en) Optical recording medium