JPS63155451A - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JPS63155451A JPS63155451A JP30293686A JP30293686A JPS63155451A JP S63155451 A JPS63155451 A JP S63155451A JP 30293686 A JP30293686 A JP 30293686A JP 30293686 A JP30293686 A JP 30293686A JP S63155451 A JPS63155451 A JP S63155451A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- substrate
- recording medium
- optical disk
- optical
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 43
- 239000010409 thin film Substances 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 3
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 3
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 3
- 239000000057 synthetic resin Substances 0.000 claims abstract description 3
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 150000003624 transition metals Chemical class 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000010408 film Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 238000004544 sputter deposition Methods 0.000 abstract description 4
- 239000000696 magnetic material Substances 0.000 abstract description 3
- 239000002223 garnet Substances 0.000 abstract description 2
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001771 vacuum deposition Methods 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 229920006393 polyether sulfone Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- TUBQDCKAWGHZPF-UHFFFAOYSA-N 1,3-benzothiazol-2-ylsulfanylmethyl thiocyanate Chemical compound C1=CC=C2SC(SCSC#N)=NC2=C1 TUBQDCKAWGHZPF-UHFFFAOYSA-N 0.000 description 1
- UJUWWKHUFOKVEN-UHFFFAOYSA-N 3-hydroxy-2-(2-hydroxyphenyl)benzoic acid Chemical compound OC(=O)C1=CC=CC(O)=C1C1=CC=CC=C1O UJUWWKHUFOKVEN-UHFFFAOYSA-N 0.000 description 1
- 125000005274 4-hydroxybenzoic acid group Chemical group 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- 101100109110 Danio rerio aph1b gene Proteins 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は光磁気ディスクに関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a magneto-optical disk.
（従来の技術）
光学的記録の一方式として熱（光）磁気記録方式が知ら
れている。この方式においては反射偏波の回転を信号と
して用いている。一方複屈折のあるものを基板として用
いる場合、複屈折によシ偏波が乱れ、ノイズやモジュレ
ーションの鳳因となる。複屈折の小さな基板としてはポ
リメチルメタアクリレ−）（ＰＭＭＡ）、エポキシ樹脂
、ガラス等、が知られているが、これらは、機械的にも
ろい、または膨潤変形する、生産性が悪い、あるいはス
パッタリング等による成膜時の真空排気特性が悪いなど
の問題点を有する。(Prior Art) A thermal (optical) magnetic recording method is known as one of the optical recording methods. In this method, the rotation of reflected polarized waves is used as a signal. On the other hand, when a substrate with birefringence is used, the birefringence disturbs the polarized waves, causing noise and modulation. Polymethyl methacrylate (PMMA), epoxy resin, glass, etc. are known as substrates with low birefringence, but these are mechanically brittle, swell and deform, have poor productivity, or It has problems such as poor evacuation characteristics during film formation by sputtering or the like.
一方ポリカーボネート系衝脂や液晶ポリマーは溝の転写
性に優れ、生産性が高く、機械的にも丈夫であるという
利点をもつが、複屈折が大きい。On the other hand, polycarbonate resins and liquid crystal polymers have the advantages of excellent groove transferability, high productivity, and mechanical strength, but they have large birefringence.
（発明が解決しようとする問題点）
本発明者らは上記の問題点を解決すべく、記録膜を形成
する基板と、信号を読み出すための光を入射する基板を
分離することＫよシ、生産性に優れ良質の信号をもつ光
磁気ディスクが得られることを見出し、本発明に到達し
た。(Problems to be Solved by the Invention) In order to solve the above-mentioned problems, the present inventors have attempted to separate the substrate on which the recording film is formed and the substrate on which light for reading signals is incident. The inventors have discovered that a magneto-optical disk with excellent productivity and high quality signals can be obtained, and have arrived at the present invention.
（問題点を解決するための手段）
すなわち、本発明の要旨は、表面にトラックサーボ用の
トラッキングパターンが形成され、かつ光磁気記録媒体
が設けられた樹脂基板（基板Ａ）と、光磁気記録媒体に
対向する位置であって、記録・再生光の入射される側に
設けられた、少々くとも記録を行なう部分に対向する表
面が平滑とされた透明基板（基［Ｂ）とから構゛成され
た光磁気ディスクに存する。(Means for Solving the Problems) That is, the gist of the present invention is to provide a resin substrate (substrate A) on which a tracking pattern for track servo is formed and a magneto-optical recording medium, It consists of a transparent substrate (base [B) with a smooth surface that faces at least the portion where recording is performed, which is provided on the side where the recording/reproducing light is incident, at a position facing the medium. It exists in the magneto-optical disk that was created.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
図１Ｋ本発明の光磁気ディスクの構造の一例を示す。FIG. 1K shows an example of the structure of the magneto-optical disk of the present invention.
基板Ａ（１）及び基板Ｂ（２）は共に合成樹脂からなシ
、記録媒体（３）には’ｒ１）Ｆ’ｅｃＱなどの着出・
遷移金属系非晶質薄膜、Ｆ’ｅ ｃ、 ０４、バリウム
フェライト、希土ガーネット磁性体、ＭｆｉＣ！ｕＢｉ
、ＰｔＭｎＳｂなどの薄膜が用いられる。薄膜の形成は
スパッタリング、真空蒸着等の通常の薄膜形成法を用い
れば良い。Both the substrate A (1) and the substrate B (2) are made of synthetic resin, and the recording medium (3) is coated with materials such as 'r1)F'ecQ.
Transition metal amorphous thin film, F'e c, 04, barium ferrite, rare earth garnet magnetic material, MfiC! uBi
, PtMnSb, or the like is used. The thin film may be formed using a conventional thin film forming method such as sputtering or vacuum evaporation.
またＴ１：１Ｆ６Ｃ！０のような金属磁性薄膜を記録層
として用いる場合は通常両面を、夫々少なくとも一層の
保護層で覆うことが好ましい。T1:1F6C again! When a metal magnetic thin film such as No. 0 is used as a recording layer, it is usually preferable to cover both surfaces with at least one protective layer.
基板Ａとしてはスパッタリングや真空蒸着時の排気時間
を短かくするため常温での相対湿度／θＯ％における吸
水率が！重ｔ％よシ低いことが望ましく、更に、成膜時
間を短かくするために、大電力を投入し、基板をターゲ
ット等の蒸発源に近づけて成膜することがあるため、耐
熱性が必要となる。For substrate A, in order to shorten the exhaust time during sputtering and vacuum evaporation, the water absorption rate at room temperature relative humidity/θO%! It is desirable to have a low t%, and heat resistance is also required because in order to shorten the film formation time, a large amount of power is applied and the film is formed by placing the substrate close to an evaporation source such as a target. becomes.
また、トラックサーボ用のトラッキングパターンのつい
た基板を安価に得るためには射出成形によシ成形可能な
ものであることが望ましい。Further, in order to obtain a substrate with a tracking pattern for track servo at a low cost, it is desirable that the substrate be moldable by injection molding.
このような点から基板Ａの具体的な材料としては、ポリ
カーボネート（ＦＯＲ）、ポリエーテルイミド、ポリフ
ェニレンオキサイド、ポリスルフォン、ポリエーテルス
ルフォン、ポリオキシベンゾイルなどや、ポリエチレン
テレフタレートとバラヒドロキシ安息香酸をアシル化剤
の存在下反応させ共重合オリゴマーを形成させた後重合
して得られる共重谷ポリエステル、 ｐ −ヒドロキシ
安息香酸／ビフェノール／テレフタル酸の三元共重合体
のｐ−ヒドロキシ安息香酸部分の一部を２−オキシ−≦
−ナフトエ酸におきかえたセラニーズ社よ＃）「ペクト
ラ」という商品名で上布されているもの等の液晶ポリマ
ーが好適である。From this point of view, specific materials for substrate A include polycarbonate (FOR), polyetherimide, polyphenylene oxide, polysulfone, polyethersulfone, polyoxybenzoyl, and acylated polyethylene terephthalate and parahydroxybenzoic acid. A part of the p-hydroxybenzoic acid moiety of a copolyester obtained by reacting in the presence of an agent to form a copolymerized oligomer and then polymerizing it, a terpolymer of p-hydroxybenzoic acid/biphenol/terephthalic acid. 2-oxy-≦
Liquid crystal polymers such as those marketed under the trade name "Pectra" are suitable.
基板Ｂとしては、再生信号の乱れ、劣化等を防ぐため、
光透過率が高く、複屈折が小さいか、または極めて複屈
折主軸のそろった樹脂基板が好ましい。具体的には複屈
折率ｊ Ｏｎｍ以下、屈折率／、／〜７．７程度のもの
が良い。For substrate B, in order to prevent disturbance and deterioration of the reproduced signal,
A resin substrate with high light transmittance and low birefringence, or whose principal axes of birefringence are extremely aligned, is preferred. Specifically, it is preferable to have a birefringence j of onm or less and a refractive index of /, / to about 7.7.
例えばエポキシ樹脂、ＰＭＭＡ、ポリメチルブテン／
（ＴＰＸ）、ポリエーテルスルホン（ｐ１！！ｓ）、ポ
リスル７オｙ（ｐｓＦｌ）、ＰｃＲ等が挙げられる。基
板Ａと基板Ｂの厚みは、通常Ｏ０５〜２ｍ程度から選ば
れる。For example, epoxy resin, PMMA, polymethylbutene/
(TPX), polyethersulfone (p1!!s), polysulfone (psFl), PcR, and the like. The thickness of the substrate A and the substrate B is usually selected from about 005 to 2 m.
尚上記の一つの基板の貼シ合せには、内周。In addition, when laminating one of the above boards, the inner periphery.
外周にエポキシ樹脂接着剤、アクリル系接着剤などの透
明な樹脂を接着剤として用いるか、または基板全面に接
着剤を塗布して貼シ合わせてもよい。また両面接着テー
プで内周、外周部を接着するか、同様に内周、外周にス
ペーサーを配置し、そのスペーサーの両面に接着剤を塗
布してもよい。A transparent resin such as an epoxy resin adhesive or an acrylic adhesive may be used as an adhesive on the outer periphery, or the adhesive may be applied to the entire surface of the substrate and bonded together. Alternatively, the inner and outer peripheries may be adhered with double-sided adhesive tape, or spacers may be similarly placed on the inner and outer peripheries, and adhesive may be applied to both sides of the spacers.
接着剤で貼シ合わせる場合接着剤が信号記録再生光波長
に対して透明である場合には、記録層上を、同接着剤が
おおっているところとおおっていないところがあっても
よい。但しこの場合同接着剤におおわれているところと
いないところの境界は基板中心に対して同心円上である
ことが好ましい。In the case of bonding with an adhesive, if the adhesive is transparent to the signal recording/reproducing light wavelength, the recording layer may be covered with the adhesive in some areas and not covered in other areas. However, in this case, it is preferable that the boundary between the area covered with the adhesive and the area not covered with the adhesive be on a concentric circle with respect to the center of the substrate.
光磁気媒体の信号読み出し効率をあげる方法にカー回転
角エンハンスメントを利用する方法源ある。One way to increase the efficiency of signal reading from a magneto-optical medium is to use Kerr rotation angle enhancement.
一般にこの読み出し効率は誘電体の屈折率（ｎ）とそれ
に接する磁性体と反対側の層との屈折率の差が大きい程
効率が良い。In general, this readout efficiency is better as the difference between the refractive index (n) of the dielectric material and the refractive index of the layer on the opposite side of the magnetic material in contact with the dielectric material is larger.
この丸め本発明においても本ディスクにおいては、基板
Ｂと媒体間の少くとも一部を空気、不活性ガス等の真空
、気体および／または、屈折率がＢよりも小さい特質、
通常は屈折率かへ弘！以下の物質で充すことが好ましい
。例えば屈折率が／ｊ４ 、ｒ以下の無機物としては５
１０２、ＱａＦｌ 、 ＭｇＦ’ｚ があり、液体とし
てはジエチルエーテル、固体有機物としてはテトラフロ
オロエチレン、７ツ化アクリルなどが挙げられる。In the present invention, at least a portion of the space between the substrate B and the medium is filled with air, a vacuum such as an inert gas, a gas, and/or a material having a refractive index smaller than that of B.
Normally the refractive index is Kahehiro! It is preferable to fill it with the following materials: For example, an inorganic substance with a refractive index of /j4 and r or less is 5
102, QaFl, and MgF'z, examples of liquids include diethyl ether, and examples of solid organic substances include tetrafluoroethylene and acrylic heptadide.
またこのような層はその厚みが信号検出系の光学系の焦
点深度のθ、／〜７０倍程度あれば十分であシ、通常Ｓ
Ｏ〜１００μｍ程度から選ばれる。In addition, it is sufficient for such a layer to have a thickness of about θ/~70 times the depth of focus of the optical system of the signal detection system, and usually S
The thickness is selected from approximately 0 to 100 μm.
以下に実施例を示す。 Examples are shown below.
実施例／〜弘、比較例／
溝のついたＦＯＲ上に記録層を成膜したディスクをＰＭ
ＭＡ、エポキシ、ＦＯＲと貼り合わせた。貼り合せは外
周部と内周部を両面接着テープで接着することによシ行
なった。ＦＯＲ上の媒体はＴｂＦｅＣｏ （／θ００Ｘ
）を酸化物保獲膜（６ｏ”０Ｘ）ではさんだものである
。Example/~Hiroshi, Comparative Example/ A disk with a recording layer formed on a grooved FOR is PM
It was laminated with MA, epoxy, and FOR. The bonding was carried out by adhering the outer circumferential portion and the inner circumferential portion using double-sided adhesive tape. The medium on the FOR is TbFeCo (/θ00X
) is sandwiched between oxide retention films (6o"0X).
図／に示すようにｐｃｘ基板基板基板Ａ）の記録媒体３
側に両面テープ弘にて種々の基板２（基板Ｂ）を貼付け
、基板Ｂ側からレーザー光を照射し、動特性（アバラン
シェ・ホトダイオード・シグナルに対する）を評価した
。Recording medium 3 of PCX board board A) as shown in figure/
Various substrates 2 (substrate B) were attached to the side using double-sided tape, and a laser beam was irradiated from the substrate B side to evaluate dynamic characteristics (relative to avalanche photodiode signals).
キャリヤレベル（１ｍり、ノイズレベル（Ｎ）、０／Ｎ
−Ｃ！ｚ／Ｎの評価結果を表／に示した。Carrier level (1m, noise level (N), 0/N
-C! The evaluation results of z/N are shown in Table/.
比較例は基板Ａ側からレーザーを照射して動特性を評価
した値である。The comparative example is a value obtained by irradiating a laser from the substrate A side and evaluating the dynamic characteristics.
表 ／
■
（」
（ｒ ＝ Ｊ ／ ｍ ）
表７のＣはキャリヤレベル、Ｎはノイズレベル、Ｃ２／
Ｎは２次歪である。基板Ｂ側からの再生によｌ）ｃ／ｙ
が著しく増加し、基板ＢとしてＰＣＲを用いた時でさえ
ｃ／Ｎが増加している。また−次歪は小さくなっている
。さらに記の感度は７割強改善されている。また 、
一番→＝４６＝Ｐモジュレーションも小さくするこ
とができた。Table / ■ ('' (r = J / m) In Table 7, C is the carrier level, N is the noise level, C2/
N is second-order distortion. By reproducing from the board B side l) c/y
is significantly increased, and even when PCR is used as substrate B, c/N is increased. Moreover, the −th order distortion is reduced. Furthermore, the sensitivity described above has been improved by more than 70%. Also ,
Ichiban→=46=P modulation was also able to be reduced.
（発明の効果）
本発明の光磁気ディスクは著しく Ｃ／Ｎ比の向上した
ものであシ、窩密度記録用として大変効果的である。(Effects of the Invention) The magneto-optical disk of the present invention has a significantly improved C/N ratio and is very effective for hole density recording.
図１は本発明の光磁気ディスクの一例を模型的に示す縦
断面図である。
図中／はトラックサーボ用のトラッキングパターンを有
する基板（：＃−板Ａ）、λは透明基板、３は記録層、
弘はスペーサー（両面テープ）をそれぞれ示す。FIG. 1 is a vertical sectional view schematically showing an example of a magneto-optical disk of the present invention. In the figure, / is a substrate (:#-board A) having a tracking pattern for track servo, λ is a transparent substrate, 3 is a recording layer,
Hiro shows spacers (double-sided tape).
Claims (6)
が形成され、かつ光磁気記録媒体が設けられた樹脂基板
と、光磁気記録媒体に対向する位置であつて、記録・再
生光の入射される側に設けられた、少なくとも記録を行
なう部分に対向する表面が平滑とされた透明基板とから
構成された光磁気ディスク。(1) A resin substrate on which a tracking pattern for track servo is formed and a magneto-optical recording medium provided, and a position facing the magneto-optical recording medium on the side where recording/reproduction light is incident. A magneto-optical disk comprising a transparent substrate with a smooth surface facing at least a recording portion.
の焦点深度の０．１〜１０倍としたことを特徴とする特
許請求の範囲第１項に記載の光磁気ディスク。(2) The magneto-optical disk according to claim 1, wherein the distance between the magneto-optical recording medium and the transparent substrate is 0.1 to 10 times the depth of focus of the detection optical system.
．４５以下の気体、液体又は固体を介在させたことを特
徴とする特許請求の範囲第１項又は第２項に記載の光磁
気ディスク。(3) There is a refractive index of 1 between the magneto-optical recording medium and the transparent substrate.
．． The magneto-optical disk according to claim 1 or 2, characterized in that a gas, liquid, or solid having a diameter of 45 or less is interposed therebetween.
．１以上１．７以下であることを特徴とする特許請求の
範囲第１項乃至第３項のいずれかに記載の光磁気ディス
ク。(4) The birefringence of the transparent substrate is 50 nm or less, and the refractive index is 1.
．． The magneto-optical disk according to any one of claims 1 to 3, characterized in that it is 1 or more and 1.7 or less.
吸水率が０．５重量％である合成樹脂で構成され、トラ
ックサーボ用のトラッキングパターンが、基板成形時に
一体に形成されたものであることを特徴とする特許請求
の範囲第１項乃至第４項のいずれかに記載の光磁気ディ
スク。(5) The resin substrate is made of synthetic resin with a water absorption rate of 0.5% by weight at room temperature and 100% relative humidity, and the tracking pattern for the track servo is integrally formed during substrate molding. A magneto-optical disk according to any one of claims 1 to 4, characterized in that:
ることを特徴とする特許請求の範囲第１項乃至第５項の
いずれかに記載の光磁気ディスク。(6) The magneto-optical disk according to any one of claims 1 to 5, wherein the magneto-optical recording medium is a rare earth/transition metal based magnetic thin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30293686A JPS63155451A (en) | 1986-12-19 | 1986-12-19 | Magneto-optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30293686A JPS63155451A (en) | 1986-12-19 | 1986-12-19 | Magneto-optical disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63155451A true JPS63155451A (en) | 1988-06-28 |
Family
ID=17914914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30293686A Pending JPS63155451A (en) | 1986-12-19 | 1986-12-19 | Magneto-optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63155451A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58150149A (en) * | 1982-03-01 | 1983-09-06 | Olympus Optical Co Ltd | Magneto-optically recording medium |
| JPS60261050A (en) * | 1984-06-06 | 1985-12-24 | Ricoh Co Ltd | Photomagnetic recording medium |
| JPS61162844A (en) * | 1985-01-14 | 1986-07-23 | Ricoh Co Ltd | Photomagnetic recording medium and its production |
| JPS6352350A (en) * | 1986-08-22 | 1988-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Magneto-optical disk memory medium |
-
1986
- 1986-12-19 JP JP30293686A patent/JPS63155451A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58150149A (en) * | 1982-03-01 | 1983-09-06 | Olympus Optical Co Ltd | Magneto-optically recording medium |
| JPS60261050A (en) * | 1984-06-06 | 1985-12-24 | Ricoh Co Ltd | Photomagnetic recording medium |
| JPS61162844A (en) * | 1985-01-14 | 1986-07-23 | Ricoh Co Ltd | Photomagnetic recording medium and its production |
| JPS6352350A (en) * | 1986-08-22 | 1988-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Magneto-optical disk memory medium |
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