JPS615450A - Optical recording member - Google Patents

Optical recording member

Info

Publication number
JPS615450A
JPS615450A JP59125911A JP12591184A JPS615450A JP S615450 A JPS615450 A JP S615450A JP 59125911 A JP59125911 A JP 59125911A JP 12591184 A JP12591184 A JP 12591184A JP S615450 A JPS615450 A JP S615450A
Authority
JP
Japan
Prior art keywords
layer
recording
base material
optical recording
thin film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP59125911A
Other languages
Japanese (ja)
Other versions
JPH0572659B2 (en
Inventor
Yoshito Ninomiya
二宮　義人
Masatoshi Takao
高尾　正敏
Noboru Yamada
昇 山田
Kenichi Nishiuchi
健一 西内
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59125911A priority Critical patent/JPS615450A/en
Publication of JPS615450A publication Critical patent/JPS615450A/en
Publication of JPH0572659B2 publication Critical patent/JPH0572659B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B7/2578—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24312—Metals or metalloids group 14 elements (e.g. Si, Ge, Sn)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24318—Non-metallic elements
    • G11B2007/2432—Oxygen
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25706—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25708—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 13 elements (B, Al, Ga)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25715—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins

Abstract

PURPOSE:To obtain an optical recording member which is less in deterioration due to moisture, long in life, and does not drop in C/N, by forming protective layers made of an oxide which is less in coefficient of water absorption, high in heat resisting property, and stable at both sides of a thin film recording layer which is raised in temperature by light irradiation and whose optical constant is changed by the temperature rise. CONSTITUTION:A thin film of Al2O3, TiO2, ZrO2, Y2O3, Nb2O5, etc., which is small in coefficient of water absorption and high in heat resisting property is formed on a base material 1 of polymethylmethacrylate, etc., by evaporation and the thin film is used as a protective layer 2. Then, after an optical recording layer 3 of Te-Sn-Ge-O thin film, etc., is formed on the layer 2, a protective layer 4 similar to the layer 2 is formed on the layer 3. Thereafter, a base material 5 which is the same as the base material 1 is joined to the upper surface of the layer 4. Therefore, moisture absorption and deterioration of C/N caused by thermal deterioration when recording, reproducing, and erasing are repeatedly performed on the recording layer 3 are prevented. Thus a long-life recording member is obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は光、熱等を用いて高速かつ高密度に光学的な情
報を記録、再生、消去できる光学記録部材に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical recording member capable of recording, reproducing, and erasing optical information at high speed and with high density using light, heat, or the like.

従来例の構成とその問題点 近年、半導体レーザの技術的発達に伴ない、レーザ光線
を利用して高密度、高速な情報の記録。Conventional configurations and their problems In recent years, with the technological development of semiconductor lasers, laser beams have been used to record information at high density and high speed.

再生、消去を行なうことが種々試みられている。Various attempts have been made to reproduce and erase data.

光学的な変化を利用する記録媒体としてはテルル（Ｔｅ
）を初めてとするカルコゲン化物、および酸化物系材料
がよく知られている。これらの材料は光学的な変化を情
報として取り出す際には有用な材料ではあるが、長期間
の保存性を考えた場合、必ずしも充分な材料ではない。Tellurium (Te) is a recording medium that utilizes optical changes.
) and oxide-based materials are well known. Although these materials are useful when extracting optical changes as information, they are not necessarily sufficient materials when considering long-term storage stability.

カルコゲン化物の場合は、非晶質であるだめ熱的に結晶
化し劣化しやすく、湿度の影響によって酸化されやすい
などの欠点を有している。In the case of chalcogenides, since they are amorphous, they have drawbacks such as being easily crystallized and degraded by heat, and easily oxidized by the influence of humidity.

また、構造としては、ＰＭＭＡ等の樹脂基村上に記録薄
膜を形成し、さらに同種の樹脂基板をはシ合わせた構造
になっておシ、このような構造においては、レーザ照射
による記録、消去の繰り返しによって基材と記録層の界
面付近の基材が損傷しやすく、記録信号の品質が低下し
てしまう欠点を有していた。In addition, the structure is such that a recording thin film is formed on a resin substrate such as PMMA, and a resin substrate of the same type is bonded together.In such a structure, recording and erasing by laser irradiation is Due to repetition, the base material near the interface between the base material and the recording layer is likely to be damaged, resulting in a disadvantage that the quality of the recording signal deteriorates.

発明の目的 本発明は、光学記録媒体の耐熱性および耐湿性を向上さ
せ、光照射の繰シ返しによる基材の損傷をなくし、長寿
命の光ディスクを提供することを目的とする。OBJECTS OF THE INVENTION An object of the present invention is to improve the heat resistance and moisture resistance of an optical recording medium, eliminate damage to the base material due to repeated light irradiation, and provide a long-life optical disc.

発明の構成 樹脂基材上に設けた保護層と、その上に形成した光照射
によって昇温しその光学定数が変化する性質を有する記
録層と、更にその上に設けた保護層と、その上部にはシ
合わせた前記基材と同種の樹脂板とを備えた構造であり
、記録層の両側に保護層を配することにより、耐熱特性
および耐湿特性を向上させ、基材と記録層の界面付近の
基材が損傷するのを防止するものである。Components of the Invention A protective layer provided on a resin base material, a recording layer formed on the recording layer whose optical constants change when heated by light irradiation, a protective layer provided thereon, and the upper part thereof. It has a structure comprising a resin plate of the same type as the base material that is combined with the base material, and by disposing a protective layer on both sides of the recording layer, heat resistance and moisture resistance are improved, and the interface between the base material and the recording layer is This prevents damage to nearby substrates.

実施例の説明 保護層材料として、吸水率が小さく、耐熱性が高く熱的
に安定な酸化物であるＡＩ、０３．ＴｔＯ２゜ＺｒＯ２
，Ｙ２Ｏ２，Ｎｂ２Ｏ６等を蒸着あるいはスパッタリン
グ法等の方法にて薄膜形成して用いることができる。い
ずれも大気中水分の記録層−の浸透をこの保護層で遮断
し、記録層膜質の変化はほとんどなく、耐湿特性は飛躍
的に向上し、長寿命化が可能になった。Description of Examples As a material for the protective layer, AI, which is a thermally stable oxide with low water absorption, high heat resistance, and 03. TtO2゜ZrO2
, Y2O2, Nb2O6, etc. can be formed into a thin film by a method such as vapor deposition or sputtering. In both cases, the protective layer blocks atmospheric moisture from penetrating the recording layer, and there is almost no change in the quality of the recording layer, dramatically improving moisture resistance and making it possible to extend the lifespan.

また、保護層を有しない構造においては、光照射による
熱サイクルで基材と記録層の界面で基材が熱変形するこ
とにより、ノイズレベルが増大して、記録信号の品質が
低下してしまうが、上記列挙したような保護層を設ける
ことによシ、繰り返し使用による基材の損傷を防止し、
ノイズレベルの増大をおさえ、Ｃ／Ｎ　の劣化が少ない
光ディスクを得ることができた。In addition, in a structure without a protective layer, the thermal cycle caused by light irradiation causes thermal deformation of the base material at the interface between the base material and the recording layer, which increases the noise level and deteriorates the quality of the recorded signal. However, by providing a protective layer such as those listed above, damage to the base material due to repeated use can be prevented,
It was possible to suppress the increase in noise level and obtain an optical disc with little deterioration in C/N.

次に本発明の光学記録部材について、更に具体的な例を
もって詳細に説明する。Next, the optical recording member of the present invention will be explained in detail using more specific examples.

実施例１ 第１図は、本発明の光学記録部材の基本的な構成の断面
図を示したものである。Example 1 FIG. 1 shows a sectional view of the basic structure of the optical recording member of the present invention.

図中１は樹脂基材であり、１．１ｔＸ１８Ｘ１８賜のＰ
ＭＭＡ樹脂基材を用い、この樹脂基村上に保護層２とし
て、不活性スパッタガス中に酸素ガス　　　　　　（□
を２６容積係混合し、１ｘ１ｏ　　Ｔｏｒｒ、４００Ｗ
等の条件でスパッタリングにより酸化アルミニウム薄膜
を形成した。その上に光照射によって昇温し、その光学
定数が変化する性質を有する厚み１０００へのＴｅ−Ｇ
ｅ−８ｎ−０系（特願昭５８−・５８１５８号）記録薄
膜３を電子ビーム法にて形成し、更にその土に保護層２
と同様の方法にて形成した酸化アルミニウムの保、護層
４を設けた後、基材１と同種の樹脂基材６を紫外線硬化
樹脂にて張り合わせた。1 in the figure is the resin base material, and the P of 1.1t x 18 x 18
Using an MMA resin base material, oxygen gas (□
26 volumetric mix, 1x1o Torr, 400W
An aluminum oxide thin film was formed by sputtering under the following conditions. On top of that, Te-G with a thickness of 1000 mm has the property that its optical constants change when the temperature is increased by light irradiation.
A recording thin film 3 of the e-8n-0 system (Japanese Patent Application No. 58158/1983) was formed by an electron beam method, and a protective layer 2 was further applied to the soil.
After providing a protection layer 4 of aluminum oxide formed in the same manner as above, a resin base material 6 of the same type as the base material 1 was laminated with an ultraviolet curing resin.

酸化アルミニウム薄膜の保護層２及び４を形成するに際
し、かなＩ）真空室が高温になるがＰＭＭＡ樹脂基材の
そ勺および光ガイド用のトラック溝の損傷や、記録膜層
の熱劣化等への影響はほとんど々かった。When forming the aluminum oxide thin film protective layers 2 and 4, the temperature of the vacuum chamber becomes high, which may cause damage to the grooves of the PMMA resin base material and the optical guide track grooves, and thermal deterioration of the recording film layer. The influence was almost negligible.

また比較のため、第１図に示す保護層２，４を有しない
構造の光学記録部材も試作した。For comparison, an optical recording member having a structure without the protective layers 2 and 4 shown in FIG. 1 was also produced as a prototype.

薄膜形成はすべて１５　Ｏｒｐｍの回転速度で行なった
。All thin film formation was performed at a rotation speed of 15 Orpm.

このようにして得られた２種の光学記録部材を６０℃−
９０８％の恒温高湿槽内に放置し、８３０％ｍの光での
透過率変化によシ耐湿度特性を求め両者の耐湿性を比較
した。The two types of optical recording members thus obtained were heated at 60°C.
The product was left in a constant temperature and high humidity chamber at 908%, and the humidity resistance was determined by the change in transmittance at 830% m, and the humidity resistance of the two was compared.

その結果を第２図に示す。The results are shown in FIG.

図において、縦軸は透過率変化で初期値をＴｏ。In the figure, the vertical axis represents the change in transmittance and the initial value is To.

経過日数後の透化率をＴＸ　とした場合１００Ｘ　（’
１−　Ｔｏ／ＴＸ　） で表わされた値である。If the transparency rate after the elapsed number of days is TX, then 100X ('
1-To/TX).

イは本発明の保護層を有する光学記録部材で、口は保護
層を有しない光学記録部材である。A is an optical recording member having a protective layer according to the present invention, and A is an optical recording member having no protective layer.

図から明らかなように、本発明の保護層を有する光学記
録部材は、保護膜を有しない光学記録部材よりも透過率
の経時変化が少なく、耐湿性に優れることがわかった。As is clear from the figure, it was found that the optical recording member having the protective layer of the present invention shows less change in transmittance over time than the optical recording member not having a protective film, and has excellent moisture resistance.

これは吸水率が小さい保護層を設置することにより、大
気中水分の浸透をこの保護層で遮断し、記録膜への浸透
を防止することによって膜質の変化が生じないためと考
えられる。This is thought to be due to the fact that by providing a protective layer with a low water absorption rate, this protective layer blocks the penetration of atmospheric moisture and prevents it from penetrating into the recording film, so that no change in film quality occurs.

実施例２ 基材としては、１．２ｔＸ２００φのＰＭＭＡ樹脂基材
を用い、記録薄膜としてはＴ　ｅｅ　ｏ　Ｓ　ｎ１ｓ　
Ｇｅｓ　Ｏ２０薄膜（特願昭５８−５８１５８号）を用
いて、−酸化アルミニウムの保護層を有する構造と有し
ない構造の２種の光ディスクを試作し、特願昭５８−５
８１５８号記載の記録、消去方法を用いて繰返し記録、
消去実験を行なった。Example 2 A PMMA resin base material of 1.2t×200φ was used as the base material, and Tee o S n1s was used as the recording thin film.
Using the GesO20 thin film (Japanese Patent Application No. 58-58158), two types of optical disks were prototyped, one with and without a protective layer of aluminum oxide.
Repeated recording using the recording and erasing method described in No. 8158,
An elimination experiment was conducted.

各薄膜の形成方法等については、実施例１と同様に行な
った。The method for forming each thin film was the same as in Example 1.

これら２種の光ディスクを用いて、記録パワー。Recording power using these two types of optical discs.

消去パワーをそれぞれ８ｍＷ、１２ｍＷとし、消去レー
ザービーム長は半値巾で１５μｍとして同一トラック上
に繰り返し記録、消去を行なりた場合のＣ／Ｎの変化を
第３図に示す。FIG. 3 shows the change in C/N when recording and erasing are repeatedly performed on the same track with erasing powers of 8 mW and 12 mW, respectively, and an erasing laser beam length of 15 μm at half-width.

記録周波数は５　ＭＨｚで、ディスクの周速は１５ｍ／
ｓで行なった。The recording frequency is 5 MHz, and the circumferential speed of the disk is 15 m/h.
I did it with s.

図において、ハは本発明の保護層を有する光学記録部材
で、二は保護層を有しない光学記録部材である、。In the figure, C is an optical recording member having a protective layer of the present invention, and 2 is an optical recording member without a protective layer.

図から明らかなように１本発明の保護層を有する光学記
録部材においては、初期のＣ／Ｎ　が保護ノーを有しな
い光学記録部材よシも高い値を示した。As is clear from the figure, the optical recording member having the protective layer of the present invention had a higher initial C/N value than the optical recording member without the protective layer.

これは、記録層の屈折率（ｎ−１−４，ｏ　）　カ保Ｈ
層（Ｄ屈折率（’ｎ＝１　、６４　）よシも大きいため
、記録層を含めた全体の系として基材側からの反射光強
度を保護層のない場合に比べて小さくすることができ光
の入射効率を高めることができたためと考えられる。ま
た記録、消去の繰り返し特性においてもＣハの劣些か非
常に小さいことがわかった。それに対して保護層を有し
ない光学記録部材においては、記録、消去の繰り返し使
用するとＣハの劣化が大きく短寿命である。これは、光
照射により記録、消去の繰り返し使用することによって
基材と記録層の界面で基材が熱変形し、それによってノ
イズレベルが増大して、Ｃ／Ｎ　が低下したものである
。This is the refractive index (n-1-4,o) of the recording layer
Since the layer (D refractive index ('n=1, 64) is also large, the intensity of reflected light from the substrate side as a whole system including the recording layer can be made smaller than when there is no protective layer. This is thought to be due to the improved light incidence efficiency.Also, it was found that the repeatability of recording and erasing was slightly inferior to C, or very small.On the other hand, in optical recording members without a protective layer, When used repeatedly for recording and erasing, the deterioration of C is large and the lifespan is shortened.This is because the substrate is thermally deformed at the interface between the substrate and the recording layer due to repeated use for recording and erasing due to light irradiation. As a result, the noise level increases and the C/N ratio decreases.

発明の効果 以上のように、本発明によれば、光学記録膜の両側に保
護層を設けることによって （１）湿度劣化が小さく、長寿命である。Effects of the Invention As described above, according to the present invention, by providing protective layers on both sides of the optical recording film, (1) humidity deterioration is small and the film has a long life.

（２）繰り返し使用時に基材の損傷をなくし、耐　　　
　　　　　　）人件に優れる。(2) Eliminate damage to the base material during repeated use and make it durable.
) Excellent in personnel matters.

等の特徴をもつ光学記録部材を得ることができる。An optical recording member having the following characteristics can be obtained.

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

第１図は、本発明の一実施例における光学記録部材の断
面図、第２図は、本発明の一実施例における光学記録部
材と従来の光学記録部材の透過率の経時変化を示すグラ
フ、第３図は、本発明の一実施例における光学記録部材
と従来の光学記録部材について、繰シ返し記録、消去を
行なった場合のＣ／Ｎ　の変化を示すグラフである。 １．５・・・・・・基材、２，４・・・・・・保護層、
３・・・・・・記録層。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 ｋ　　Ａ牢　麦イヒ　（オ目り１イ直）ＣノＨ（ｄＢ）FIG. 1 is a cross-sectional view of an optical recording member according to an embodiment of the present invention, and FIG. 2 is a graph showing changes in transmittance over time of an optical recording member according to an embodiment of the present invention and a conventional optical recording member. FIG. 3 is a graph showing changes in C/N when recording and erasing are repeatedly performed on an optical recording member according to an embodiment of the present invention and a conventional optical recording member. 1.5...base material, 2,4...protective layer,
3...Recording layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure k

Claims (3)

【特許請求の範囲】[Claims] （１）光照射によって昇温しその光学定数が変化する薄
膜記録層の両側に、保護層を設けた光学記録部材。(1) An optical recording member in which protective layers are provided on both sides of a thin film recording layer whose optical constants change as the temperature rises due to light irradiation. （２）両側の保護層が同種の組成物で、かつその屈折率
が、記録層の屈折率よりも小さいことを特徴とする特許
請求の範囲第１項記載の光学記録部材。(2) The optical recording member according to claim 1, wherein the protective layers on both sides are made of the same composition and have a refractive index smaller than that of the recording layer. （３）保護層が、酸化アルミニウム・二酸化チタン・二
酸化ジルコニウム・酸化イットリウム・五酸化ニオブよ
り選ばれたものであることを特徴とする特許請求の範囲
第１項記載の光学記録部材。(3) The optical recording member according to claim 1, wherein the protective layer is selected from aluminum oxide, titanium dioxide, zirconium dioxide, yttrium oxide, and niobium pentoxide.
JP59125911A 1984-06-19 1984-06-19 Optical recording member Granted JPS615450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59125911A JPS615450A (en) 1984-06-19 1984-06-19 Optical recording member

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59125911A JPS615450A (en) 1984-06-19 1984-06-19 Optical recording member

Publications (2)

Publication Number Publication Date
JPS615450A true JPS615450A (en) 1986-01-11
JPH0572659B2 JPH0572659B2 (en) 1993-10-12

Family

ID=14921963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59125911A Granted JPS615450A (en) 1984-06-19 1984-06-19 Optical recording member

Country Status (1)

Country Link
JP (1) JPS615450A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159840A (en) * 1987-12-17 1989-06-22 Matsushita Electric Ind Co Ltd Optical disk

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5778649A (en) * 1980-10-30 1982-05-17 Teijin Ltd Laminated material for optical memory
JPS58175153A (en) * 1982-04-08 1983-10-14 Matsushita Electric Ind Co Ltd Optical recording and reproducing disc
JPS58203094A (en) * 1982-05-24 1983-11-26 Nippon Telegr & Teleph Corp <Ntt> Optical recording medium
JPS58224446A (en) * 1982-06-23 1983-12-26 Hitachi Ltd Recording material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5778649A (en) * 1980-10-30 1982-05-17 Teijin Ltd Laminated material for optical memory
JPS58175153A (en) * 1982-04-08 1983-10-14 Matsushita Electric Ind Co Ltd Optical recording and reproducing disc
JPS58203094A (en) * 1982-05-24 1983-11-26 Nippon Telegr & Teleph Corp <Ntt> Optical recording medium
JPS58224446A (en) * 1982-06-23 1983-12-26 Hitachi Ltd Recording material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159840A (en) * 1987-12-17 1989-06-22 Matsushita Electric Ind Co Ltd Optical disk

Also Published As

Publication number Publication date
JPH0572659B2 (en) 1993-10-12

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