JPH01267856A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPH01267856A JPH01267856A JP63095127A JP9512788A JPH01267856A JP H01267856 A JPH01267856 A JP H01267856A JP 63095127 A JP63095127 A JP 63095127A JP 9512788 A JP9512788 A JP 9512788A JP H01267856 A JPH01267856 A JP H01267856A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- recording medium
- adhesive
- recording
- epoxy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 21
- 239000010410 layer Substances 0.000 claims abstract description 32
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 239000011241 protective layer Substances 0.000 claims abstract description 13
- 239000004593 Epoxy Substances 0.000 claims abstract description 8
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012790 adhesive layer Substances 0.000 claims abstract description 7
- 150000001412 amines Chemical class 0.000 claims abstract description 6
- 229920006332 epoxy adhesive Polymers 0.000 claims abstract 3
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 230000001070 adhesive effect Effects 0.000 claims description 17
- 239000000758 substrate Substances 0.000 abstract description 11
- 238000000576 coating method Methods 0.000 abstract description 4
- 229920000515 polycarbonate Polymers 0.000 abstract description 4
- 239000004417 polycarbonate Substances 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 3
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000004848 polyfunctional curative Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 5
- 239000003085 diluting agent Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001755 magnetron sputter deposition Methods 0.000 description 3
- 150000008065 acid anhydrides Chemical class 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 150000004982 aromatic amines Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 210000003127 knee Anatomy 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KOGSPLLRMRSADR-UHFFFAOYSA-N 4-(2-aminopropan-2-yl)-1-methylcyclohexan-1-amine Chemical compound CC(C)(N)C1CCC(C)(N)CC1 KOGSPLLRMRSADR-UHFFFAOYSA-N 0.000 description 1
- FVCSARBUZVPSQF-UHFFFAOYSA-N 5-(2,4-dioxooxolan-3-yl)-7-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C(C(OC2=O)=O)C2C(C)=CC1C1C(=O)COC1=O FVCSARBUZVPSQF-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光を用いて情報の記録、再生または消去を行
う光学的情報記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical information recording medium that records, reproduces, or erases information using light.
従来の光学的情報記録媒体はロールフート法によるもの
が検討されている。また、片面型の光記録媒体において
は紫外線硬化樹脂を用いた貼り合わせが検討されている
。Conventional optical information recording media based on the roll foot method are being considered. Furthermore, for single-sided optical recording media, bonding using ultraviolet curing resin is being considered.
しかし従来技術のロールフート法による貼り合わせでは
光学的情報記録媒体の耐熱性がなく、保護層や記録層に
クラックを生じやすく信頼性に問題があった。また、紫
外線硬化樹脂を用いた貼り合わせでは両面型の光学的情
報記録媒体は実現が非常に難しい。However, when bonding by the conventional roll foot method, the optical information recording medium lacks heat resistance, and cracks tend to occur in the protective layer and recording layer, resulting in reliability problems. Furthermore, it is very difficult to realize a double-sided optical information recording medium by laminating using an ultraviolet curable resin.
また、通常のエポキシ樹脂は主にビスフェノールＡ系の
主剤と、硬化剤として脂肪族または芳香族アミンやアミ
ドあるいは酸無水物などが用いられている。それにアミ
ン系の硬化促進剤や可とう性付与剤や充填剤や反応性希
釈剤を加えることなどが検討されている。一般にビスフ
ェノールＡ系の主剤は粘度が高く、作業性が非常に悪い
ので反応性希釈剤を添加して粘度を下げることなどが検
討されている。しかし、反応性希釈剤を添加すると耐熱
性が悪くなり、硬化物の物性が悪くなるのであまり多く
添加できない。また、通常の脂肪族アミンやアミド系の
硬化剤を用いた場合はポットライフが短いために、機械
を用いた塗布が難しくなる。芳香族アミンは毒性が高く
取扱が難しい。Furthermore, ordinary epoxy resins mainly use a bisphenol A base resin and a hardening agent such as an aliphatic or aromatic amine, amide, or acid anhydride. The addition of amine-based curing accelerators, flexibility-imparting agents, fillers, and reactive diluents is being considered. In general, bisphenol A-based main agents have high viscosity and are very difficult to work with, so it is being considered to add reactive diluents to lower the viscosity. However, if a reactive diluent is added, the heat resistance will deteriorate and the physical properties of the cured product will deteriorate, so it cannot be added in too much. Furthermore, when a normal aliphatic amine or amide curing agent is used, the pot life is short, making it difficult to apply using a machine. Aromatic amines are highly toxic and difficult to handle.
酸無水物系の硬化剤を用いたものはエポキシの硬化温度
が１２０℃以上であり非常に高いため、樹脂基板を用い
た光記録媒体の貼り合わせには、樹脂基板の熱変形や、
保護層や記録層にクラックが生じるため適さない。The curing temperature of epoxy using an acid anhydride curing agent is 120°C or higher, which is extremely high. Therefore, when bonding optical recording media using resin substrates, thermal deformation of the resin substrate,
This is not suitable as it will cause cracks in the protective layer and recording layer.
そこで本発明はこのような課題を解決するものでその目
的とするところは、ロールコート法で作成するより耐熱
性があり、８０℃や９０℃の高温でも保護層や記録層に
クラックを生じることがなく、ビスフェノールＩＰ系の
エポキシを主剤として用いているので比較的低粘度で作
業性がよく、硬化物の耐熱性も高く、さらに環状脂肪族
アミン系の硬化剤を用いているのでポットライフが長い
ため機械を用いた塗布が容易であり、６０ ’Ｏから７
０℃程度の低温で硬化できるため量産性がある光学的情
報記録媒体を提供するところにある。Therefore, the present invention is intended to solve these problems, and its purpose is to have higher heat resistance than those created by roll coating, and to prevent cracks from occurring in the protective layer or recording layer even at high temperatures of 80°C or 90°C. Since it uses bisphenol IP-based epoxy as the main ingredient, it has a relatively low viscosity and is easy to work with, and the cured product has high heat resistance.Furthermore, it uses a cycloaliphatic amine-based curing agent, so it has a short pot life. Due to its long length, it is easy to apply using a machine, and from 60'O to 7
The object of the present invention is to provide an optical information recording medium that can be cured at a low temperature of about 0° C. and thus can be mass-produced.
本発明は光を用いて情報の記録再生または消去を行う光
学的情報記録媒体において、透光性支持体の上に記録層
及び保護層からなる記録層部を成膜したものを貼り合わ
せた構造において接着層としてエポキシ系の接着剤を用
いて該接着剤の主成分の主剤がビスフェノールＦ系のエ
ポキシであり、硬化剤の主成分が環状脂肪族アミン系で
あることを特徴とする。The present invention relates to an optical information recording medium that records, reproduces, or erases information using light, and has a structure in which a recording layer portion consisting of a recording layer and a protective layer is laminated onto a transparent support. An epoxy-based adhesive is used as the adhesive layer, the main component of the adhesive is bisphenol F-based epoxy, and the main component of the curing agent is cycloaliphatic amine-based.
本発明において用いるビスフェノールＦ系の主剤は常温
において粘度が５０００ｃｐｓ以下のものを用いた方が
作業性がよく、貼り合わせやすいし脱泡も容易である。As the bisphenol F-based main agent used in the present invention, one having a viscosity of 5000 cps or less at room temperature has better workability, easier bonding, and easier defoaming.
泡を多く含んだままで貼り合わせると、接着剤の硬化に
伴う応力により信号に悪影響を及ぼしたり、信頼性の低
下をきたす。If the adhesive is laminated with a large amount of bubbles, the stress caused by the curing of the adhesive will adversely affect the signal and reduce reliability.
また、本発明では環状脂肪族アミン系の硬化剤を用いる
が、この添加量は主剤に対して重量比で１％から１５％
が適当である。１％以下では接着剤の硬化に時間がかか
ったり、接着剤の硬化が不完全となりやすい。１５％以
上では接着剤のポットライフが短くなり機械を用いた塗
布が難しくなったり、硬化物の耐熱性が低下したりする
。この添加量と主剤の成分により硬化物の特性が維持で
きて、ポットライフが５時間以上になるように調節する
とよい。硬化剤は常温で液体のものが主剤との混合が容
易になるため、常温で固形物のものは常温で液体のもの
と混合したりして用いるとよい〔実施例〕
以下本発明について図面に基づいて詳細に説明する。In addition, in the present invention, a cycloaliphatic amine type curing agent is used, and the amount added is 1% to 15% by weight based on the main resin.
is appropriate. If it is less than 1%, it may take a long time to cure the adhesive, or the adhesive may be incompletely cured. If it exceeds 15%, the pot life of the adhesive becomes short, making it difficult to apply using a machine, and the heat resistance of the cured product decreases. It is preferable to adjust the amount of addition and the components of the main agent so that the properties of the cured product can be maintained and the pot life is 5 hours or more. A curing agent that is liquid at room temperature is easier to mix with the main agent, so it is preferable to use a curing agent that is solid at room temperature by mixing it with a curing agent that is liquid at room temperature. This will be explained in detail based on the following.
第１図は本発明になる光記録媒体の基本構成図である。FIG. 1 is a basic configuration diagram of an optical recording medium according to the present invention.
１及び６はポリカーボネートの基板、２及び７は５ｔｉ
ＡＩＮの第１保護層、３及び８はＮｄＤｙＦｅ０ｏの記
録層、４及び９は５ｉＡ１Ｎの第２保護層、５は本発明
になる接着層である。５の接着層に用いたエポキシは主
剤として大日本インキ化学工業のエピクロンＳ−１２９
を用いて、硬化剤はメンタンジアミンを用いた。主剤と
硬化剤の配合比は重量で２０＝１とした。1 and 6 are polycarbonate substrates, 2 and 7 are 5ti
A first protective layer of AIN, 3 and 8 a recording layer of NdDyFe0o, 4 and 9 a second protective layer of 5iA1N, and 5 an adhesive layer according to the present invention. The epoxy used for the adhesive layer in step 5 is Epiclon S-129 manufactured by Dainippon Ink and Chemicals.
was used, and menthanediamine was used as the curing agent. The blending ratio of the main agent and curing agent was 20=1 by weight.
次に表１に、第１図に示す構成の光学的情報記録媒体に
おいて、接着剤を種々変更して貼り合わせたときの８０
℃９０％ＲＨ下で５０００時間耐候性試験後のピットエ
ラーレートを耐候性試験前のピットエラーレートで規格
化した値及びその時の性状を示す。Next, Table 1 shows the results of 80% when the optical information recording medium having the structure shown in FIG. 1 is laminated with various adhesives.
The values obtained by normalizing the pit error rate after a weathering test for 5000 hours at 90% RH by the pit error rate before the weathering test and the properties at that time are shown.
第１図及び表１に示した光記録媒体はすべて以下のもの
を用いた。射出圧縮成型により１．６μピツチでスパイ
ラル状のトラッキング用の溝を形成したポリカーボネー
トの基板の溝を形成した側に５ｉＡｌの焼結ターゲット
を用いたＲ７反応マグネトロンスパッタ法により８００
人成膜した後、ＮｄＤｙＦｅ０ｏの合金ターゲットを用
いたり。All of the optical recording media shown in FIG. 1 and Table 1 were as follows. A polycarbonate substrate on which spiral tracking grooves were formed with a pitch of 1.6μ by injection compression molding was formed with an 800 mm diameter by R7 reaction magnetron sputtering using a 5iAl sintered target on the side where the grooves were formed.
After forming the film manually, we used an NdDyFe0o alloy target.
マグネトロンスパッタ法により９００＾成膜して、さら
にその上に５ｉＡ１の合金ターゲットな用いたＲ７反応
マグネトロンスパッタ法により８００λ成膜したものを
２枚用いて接着剤を種々変更して貼り合わせた。貼り合
わせ方法は、ロールフート法以外は基板の記録層部が形
成されている側に接着剤をドーナツ状に塗布した後、真
空系内において脱泡して真空系内で別の基板と貼り合わ
せて、上下の基板の中心穴が合うようにして、１２時間
放置して７０℃で５時間加熱して接着剤を硬化させた。A 900^ film was formed by magnetron sputtering, and then an 800λ film was formed by R7 reaction magnetron sputtering using a 5iA1 alloy target, and two sheets were bonded together using various adhesives. The bonding method, other than the roll foot method, is to apply adhesive in a donut shape to the side of the substrate where the recording layer is formed, degas it in a vacuum system, and then bond it to another substrate in a vacuum system. The center holes of the upper and lower substrates were aligned, and the adhesive was left to stand for 12 hours and then heated at 70° C. for 5 hours to harden the adhesive.
表１の結果から分るように、本発明の光学的情報記録媒
体は８０℃９０％ＲＨという条件下でもピットエラーレ
ートが変化しないので長期信頼性があることがわかる。As can be seen from the results in Table 1, the optical information recording medium of the present invention has long-term reliability because the pit error rate does not change even under the conditions of 80° C. and 90% RH.
尚、本発明はこれらの実施例の限定されるものではなく
、本発明の主旨を逸脱しない限り種々の変更は可能であ
る。例えば本発明では記録層としてＮｄＤｙＦｅｏＯ層
を用いたが、ＮｄＤｙＴｂＦｅｏｏ層、ＧｄＴｂＦｅｏ
Ｏ層、ＴｂｌＦｅｏＯ層等の光磁気記録層の他にＴ ｅ
−ＴｅＯｘ層、工ｎ −Ａ ｇ層等の光相変化型の記
録層を用いても何等問題はない。また保護層も５ｉＡＩ
Ｎ層の他にＳｉＮ層、Ｓ１０層、ＡＩＮ層等を用いても
よい。さらに本実施例では両面型の光記録媒体を例にと
っているが、例えば記録層を成膜した基板と記録層のな
い基板とを貼り合わせるような片面型の光記録媒体であ
ってもよい。本発明においては接着剤は李に主剤と硬化
剤のみの組合せであったが、硬化物の物性があまり変化
しない程度に反応性希釈剤、硬化促進剤、充填剤、シラ
ンカップリング剤、レベリング剤、安定剤などの添加剤
を添加してもよい。Note that the present invention is not limited to these embodiments, and various changes can be made without departing from the spirit of the present invention. For example, in the present invention, an NdDyFeoO layer is used as the recording layer, but a NdDyTbFeoo layer, a GdTbFeo layer
In addition to magneto-optical recording layers such as O layer and TblFeoO layer, T e
There is no problem in using an optical phase change type recording layer such as a -TeOx layer or an -Ag layer. The protective layer is also 5iAI
In addition to the N layer, a SiN layer, an S10 layer, an AIN layer, etc. may be used. Further, in this embodiment, a double-sided optical recording medium is taken as an example, but a single-sided optical recording medium may be used, for example, in which a substrate on which a recording layer is formed and a substrate without a recording layer are bonded together. In the present invention, the adhesive is a combination of only a base agent and a curing agent, but it is necessary to add a reactive diluent, a curing accelerator, a filler, a silane coupling agent, and a leveling agent to the extent that the physical properties of the cured product do not change much. , stabilizers and other additives may be added.
エピコート ８０７：油化シェルエポキシ■製エピコー
ト ８０８ ： ｔｔエビキュアよりＭニ
ー１２： 〃エピキュアＢＭニー１２：
エピクロンＳ−１２９：大日本インキ化学工業■製エピ
クロン８３０ ： ｔｐエピクロン８５０
−３： ｐ
エピクロン５２０ ： ／Ｆ〔発明の効果
〕
本発明の光学的情報記録媒体は以下のような効果を有す
る。Epicure 807: Made by Yuka Shell Epoxy ■ Epicoat 808: M knee 12 from tt Ebicure: Epicure BM knee 12: Epicron S-129: Epicron 830 manufactured by Dainippon Ink & Chemicals ■: tp Epicron 850
-3: p Epicron 520: /F [Effects of the Invention] The optical information recording medium of the present invention has the following effects.
（１） ロールコート法で作成するより耐熱性があり
、８０℃や９０℃の高温でも保護層や記録層にクラック
を生じることがない。(1) It is more heat resistant than those produced by roll coating, and does not cause cracks in the protective layer or recording layer even at high temperatures of 80°C or 90°C.
（２） 接着剤が比較的低粘度で作業性がよく貼り合
わせやすい。(2) The adhesive has a relatively low viscosity and is easy to work with, making it easy to bond together.
（３）接着剤の硬化物の耐熱性が高く、比較的低温でも
硬化が可能である。(3) The cured adhesive has high heat resistance and can be cured even at relatively low temperatures.
（４） 接着剤のポットライフが比較的長いので機械を
用いた塗布が容易であり、量産性がある。(4) Since the pot life of the adhesive is relatively long, it is easy to apply using a machine, and mass production is possible.
（５）両面型の光学的情報記録媒体が容易に実現できる
。(5) A double-sided optical information recording medium can be easily realized.
第１図は、本発明の光記録媒体の基本構成図である。
１．６・・・・・・ポリカーボネートの基板２．７・・
・・・・５ｉＡＩＮの第１記録層５．８・＝＝ＮｄＤｙ
ＩＦｅＯｏの記録層４．９・・・・・・ＳｉＡ’ｌＮの
第２保護層５・・・・・・・・・・・・本発明になる接
着層以上
出願人 セイコーエプソン株式会社
代理人 弁理士 上柳雅誉（他１名）FIG. 1 is a basic configuration diagram of the optical recording medium of the present invention. 1.6... Polycarbonate substrate 2.7...
...5iAIN first recording layer 5.8 ==NdDy
Recording layer of IFeOo 4.9...Second protective layer of SiA'IN 5...Adhesive layer according to the present invention Applicant: Seiko Epson Co., Ltd. Agent Patent attorney Master Masayoshi Kamiyanagi (1 other person)
Claims (1)
体において、透光性支持体の上に記録層及び保護層から
なる記録層部を成膜したものを貼り合わせた構造におい
て、接着層としてエポキシ系の接着剤を用いて、該接着
剤の主成分の主剤がビスフエノールＦ系のエポキシであ
り、硬化剤の主成分が環状脂肪族アミン系であることを
特徴とする光学的情報記録媒体。In an optical recording medium that records, reproduces, or erases information using light, it is used as an adhesive layer in a structure in which a recording layer consisting of a recording layer and a protective layer is laminated onto a transparent support. An optical information recording medium using an epoxy adhesive, characterized in that the main component of the adhesive is a bisphenol F-based epoxy, and the main component of the curing agent is a cycloaliphatic amine-based one. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63095127A JPH01267856A (en) | 1988-04-18 | 1988-04-18 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63095127A JPH01267856A (en) | 1988-04-18 | 1988-04-18 | Optical information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01267856A true JPH01267856A (en) | 1989-10-25 |
Family
ID=14129159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63095127A Pending JPH01267856A (en) | 1988-04-18 | 1988-04-18 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01267856A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03254438A (en) * | 1989-03-27 | 1991-11-13 | Mitsubishi Electric Corp | Optical disk |
| JPH04219627A (en) * | 1990-04-20 | 1992-08-10 | Matsushita Electric Ind Co Ltd | Optical disk recording and reproducing device |
| USRE37185E1 (en) | 1990-04-20 | 2001-05-22 | Matsushita Electric Industrial Co., Ltd. | Optical head |
| JP2017119861A (en) * | 2015-12-25 | 2017-07-06 | 東レ株式会社 | Epoxy resin composition, fiber-reinforced composite material, molded product and pressure container |
-
1988
- 1988-04-18 JP JP63095127A patent/JPH01267856A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03254438A (en) * | 1989-03-27 | 1991-11-13 | Mitsubishi Electric Corp | Optical disk |
| JPH04219627A (en) * | 1990-04-20 | 1992-08-10 | Matsushita Electric Ind Co Ltd | Optical disk recording and reproducing device |
| USRE37185E1 (en) | 1990-04-20 | 2001-05-22 | Matsushita Electric Industrial Co., Ltd. | Optical head |
| JP2017119861A (en) * | 2015-12-25 | 2017-07-06 | 東レ株式会社 | Epoxy resin composition, fiber-reinforced composite material, molded product and pressure container |
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