JPS62177736A - 光学記憶素子 - Google Patents

光学記憶素子

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Publication number
JPS62177736A
JPS62177736A JP61020449A JP2044986A JPS62177736A JP S62177736 A JPS62177736 A JP S62177736A JP 61020449 A JP61020449 A JP 61020449A JP 2044986 A JP2044986 A JP 2044986A JP S62177736 A JPS62177736 A JP S62177736A
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JP
Japan
Prior art keywords
film
layer
reflective film
film thickness
reflective
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
JP61020449A
Other languages
English (en)
Other versions
JPH0789414B2 (ja
Inventor
Tomoyuki Miyake
知之 三宅
Yoshiteru Murakami
善照 村上
Hiroyuki Katayama
博之 片山
Akira Takahashi
明 高橋
Kenji Oota
賢司 太田
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.)
Sharp Corp
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Sharp Corp
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=12027372&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPS62177736(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP61020449A priority Critical patent/JPH0789414B2/ja
Priority to US07/009,211 priority patent/US4956243A/en
Priority to DE3785375T priority patent/DE3785375T3/de
Priority to EP87300908A priority patent/EP0233034B2/en
Publication of JPS62177736A publication Critical patent/JPS62177736A/ja
Publication of JPH0789414B2 publication Critical patent/JPH0789414B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 く技術分野〉 本発明は光学的に情報を記録・再生あるいは消去をする
光学記憶素子に関する。
〈従来技術〉 近年、情報処理技術の分野におりては、情報の多計化お
よび多様性の急速な進行に伴い、磁気メモリの容量増大
などに対する要求が著しく高くなりつつある。そこで従
来の記録方式に代るものとして光記録用媒体を用いた光
記録方式が考えられ実用化されている。しかし、現在消
去及び再書込み可能な光ディスクはまだ実用化しておら
ず、早急な開発実用化が期待されている。
消去、再書込み可能な光メモリとしては光磁気媒体を用
いたもの、いわゆる磁２カー効果を用いたものや、非晶
質カルコゲナイドのフォトダークニング現象を用いたも
の、媒体の相変化による光反射率の変化音用いたもの等
があるが、この中で最も有望な方法が光磁気媒体を用い
たものであった。　　　　− 光磁気媒体には、希土類−遷移金属アモルファス合金を
用いたものがあるが、これは信号読出し特性に重要なカ
ー回転角が未だ小さいという欠点をもっている。そこで
光磁気媒体の磁気カー回転角を増大させる方法が数多く
試みられてきた。その中の１つとして１反射膜構造を持
った多層膜とし見かけの磁気カー回転角を増大させ、信
号品質を向上させる方法がある。この方法では入射光の
Ｉ　Ｈ’９Ｊｆ、が磁性膜の表面でカー効果を受けて反
射し、その（Ｉｈは媒体中に入り、裏面から抜は出た所
で反射膜によって元に返し磁性体内部でのファラデー効
果を使うことで見かけのカー回転角が大きくなリ、Ｃ／
Ｈの増加に計っているＯ ｆｆ’、　２図は従来の光磁気ディスクの構成図であり
１はガラスまたはプラスチック板、２はＡノＮ膜、３は
ＧｄＴｂＦｅ膜、４はＡノＮ膜、５はＡノ膜である。
この場合、反射膜にはより大きな反射率が望まれる。従
って、反射膜に用いられる材料は半導体レーザー波長域
で反射率の高いＡノ、Ｃｕ、Ａｕ、Ａｇ等であった。し
かしながらこれらの材料は一般に熱伝導率が大きく光磁
気ディスクの記録感度を低下させる。
〈発明の目的〉 大発明は光記録媒体の反射膜を２層構造とすることによ
り、信号再生特性が良く、記録感度の高い光記録媒体を
提供することを目的とする。
〈実施例〉 以下本発明に係る光記憶素子の一実施例としての光磁気
ディスクを図面を用いて詳細に説明する。
第１図は大発明に係る光磁気ディスクの構成図である。
同図においてガラスまンｔはプラスチック板力１らなる
透明展板ｌ上に第１誘電層としてのＡ１Ｎ膜＾ ２を膜厚８００ヤ、光磁気記録媒体としての＾ Ｇ　ｄ　Ｔ　ｂ　Ｆ　ｅ膜を膜厚２０ＯＮ、第２誘電層
としてのＡ１Ｎ膜４を膜厚２５０だ、第１反射膜として
のＡノ膜６を膜厚１００に、第２反射、漠として＾ のＮｉ膜７を膜厚５００ｔ、成膜して光磁気ディスクを
構成し、見かは上の磁気カー回転角を増大させると同時
にその記録感度の低下を防いでいる。
上記の如く相対的に光の反射率の充分大きｌＡパノを反
射１′摸の第１層に用い、熱伝導率の充分小さいＮｉｋ
反射膜の第２層に用いることにより、従来の単−合戦の
反射膜で得られなかった旨反射率。
高記録感度の記録媒体を構成できたものであった。
第３図は反射膜を上記２層構造とした場合、Ｎｉス 膜の膜厚を５００ｆｆｉ一定としてＡｉの膜厚をθ〜＾ ２００だと変化した場合のカー回転角１反射率。
だ円率の変化を示す。Ａノが厚くなるとＮｉ膜の光学的
な効果は薄れてＡノ単層摸とほぼ同じ特性になる。Ａ１
膜膜厚が１００ににおいてカー回転角１．　ｌ　ｄｅｇ
　、反射率１７％、だ円率０．０２とＡノ単層膜の場合
に比較してそれぞれ同程度の数値？示した。この場合記
録感度の低下の原因とな入 るへ１部分の厚さは１００にしかなく反射膜の大部分は
熱伝導率がＡノの半分以下のＮｉで構成されている。
なお、反射膜の第１層としてはＡノの他にＣｕ。
Ａｕ、Ａｇ等の反射率の高い金属、第２層としてはＴｈ
、Ｔａ等の熱伝導率の低いものを用いても同様の効果が
得られる。捷た、熱伝導率はＡノにＮｉ等の元素を加え
ても低下するので第２層としてＮ１単体ではなく、Ａノ
Ｎｉ等の２元合金膜を用いても良い。
以上の大発明の主旨は光メモリにおける反射膜を２層構
造とすることにより、信号再生特性が良く、記録感度の
高い光記録媒体を提供することにあるものであり、第１
層、第２層の材料はこれらに限定されるものではなＶ／
−１゜ 〈発明の効果〉 以上の大発明によれば光ディスクにおける反射率を損う
ことなく、記録感度を向上させるため、単層の反射膜と
比較して非常に有利である。
【図面の簡単な説明】
第１図は大発明に係る光磁気記録媒体の断面図、第２図
は従来の水磁気記録用媒体の断面図、第３図はＡｉ膜厚
を変化させた場合のカー回転角。 反射率、だ円率のグラフ図を示す。 山中、 ｌニガラスまたはプラスデック基板、 ２：Ａ１Ｎ膜、　３　：ＧｄＴｂＦｅ等光磁気媒体、４
：／’７１Ｎ膜、　５：Ａｆｆｌ捷たＬｔＣｕ膜、６：
Ａｌ１膜、　　　７：Ｎｉ膜 代理人　弁理士　杉　山　没　至（他１名）第１図 （ｄｅψ 第３囚。

Claims (1)

    【特許請求の範囲】
  1. １、相対的に光の反射率の充分大きい金属と熱伝導率の
    充分小さい金属の２層構造からなる金属膜をレーザの反
    射膜として使用することを特徴とする光学記憶素子。
JP61020449A 1986-01-31 1986-01-31 光学記憶素子 Expired - Fee Related JPH0789414B2 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP61020449A JPH0789414B2 (ja) 1986-01-31 1986-01-31 光学記憶素子
US07/009,211 US4956243A (en) 1986-01-31 1987-01-30 Optical memory element
DE3785375T DE3785375T3 (de) 1986-01-31 1987-02-02 Element mit optischem Gedächtnis.
EP87300908A EP0233034B2 (en) 1986-01-31 1987-02-02 Optical memory element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61020449A JPH0789414B2 (ja) 1986-01-31 1986-01-31 光学記憶素子

Publications (2)

Publication Number Publication Date
JPS62177736A true JPS62177736A (ja) 1987-08-04
JPH0789414B2 JPH0789414B2 (ja) 1995-09-27

Family

ID=12027372

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Country Link
US (1) US4956243A (ja)
EP (1) EP0233034B2 (ja)
JP (1) JPH0789414B2 (ja)
DE (1) DE3785375T3 (ja)

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JPH04176037A (ja) * 1990-11-08 1992-06-23 Nec Corp 光磁気記録媒体
JP2007164768A (ja) * 2005-11-16 2007-06-28 Kyodo Printing Co Ltd 非接触ｉｃカード

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US5644554A (en) * 1988-01-19 1997-07-01 Hitachi, Ltd. Magnetic head load/unload device, method and a magneto-optical disk apparatus using the same
DE3803000A1 (de) * 1988-02-02 1989-08-10 Basf Ag Flaechenfoermiges, mehrschichtiges magneto-optisches aufzeichnungsmaterial
EP0368194B1 (en) * 1988-11-07 1998-06-17 Hitachi, Ltd. Magneto-optical recording medium
US5171392A (en) * 1988-11-08 1992-12-15 Pioneer Electronic Corporation Method of producing an optical information record carrier
JPH0823941B2 (ja) * 1988-11-08 1996-03-06 パイオニア株式会社 光学式情報記録担体及びその製造方法
US5914198A (en) * 1989-06-05 1999-06-22 Hitachi, Ltd. Magneto-optical recording medium having dielectric layers with different indices of refraction
JP2549079B2 (ja) * 1989-08-31 1996-10-30 ダイセル化学工業株式会社 複合光磁気記録媒体
US5303225A (en) * 1989-10-30 1994-04-12 Matsushita Electrical Industrial Co., Ltd. Multi-layered optical disk with track and layer identification
US5233575A (en) * 1989-11-10 1993-08-03 Mitsubishi Kasei Corporation Magneto-optical recording medium
DE69130441T2 (de) * 1990-08-07 1999-04-08 Hitachi Maxell, Ltd., Ibaraki, Osaka Magnetooptischer Aufzeichnungsträger
JPH04105231A (ja) * 1990-08-24 1992-04-07 Sony Corp 光磁気ディスク
EP0482606B1 (en) * 1990-10-26 1995-08-16 Teijin Limited Magneto-optical recording medium
JP3178025B2 (ja) * 1990-11-07 2001-06-18 ソニー株式会社 光磁気記録媒体及びその製造方法
JPH056588A (ja) * 1990-11-19 1993-01-14 Ricoh Co Ltd 光磁気記録媒体及び光磁気記録方法
DE4040163A1 (de) * 1990-12-15 1992-06-17 Basf Ag Reversibler optischer aufzeichnungtraeger vom phasenwechsel-typ
JP2786360B2 (ja) * 1991-12-05 1998-08-13 シャープ株式会社 光磁気ディスク
JP3292890B2 (ja) * 1992-08-10 2002-06-17 株式会社リコー 光反射放熱用材料を用いた相変化形光記録媒体
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JPH04176037A (ja) * 1990-11-08 1992-06-23 Nec Corp 光磁気記録媒体
JP2007164768A (ja) * 2005-11-16 2007-06-28 Kyodo Printing Co Ltd 非接触ｉｃカード

Also Published As

Publication number Publication date
JPH0789414B2 (ja) 1995-09-27
EP0233034B2 (en) 1996-08-28
DE3785375T3 (de) 1997-02-27
DE3785375T2 (de) 1993-07-29
DE3785375D1 (de) 1993-05-19
EP0233034A3 (en) 1989-02-15
EP0233034A2 (en) 1987-08-19
US4956243A (en) 1990-09-11
EP0233034B1 (en) 1993-04-14

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