JP2002216401A - Magneto-optical recording medium - Google Patents
Magneto-optical recording mediumInfo
- Publication number
- JP2002216401A JP2002216401A JP2001008642A JP2001008642A JP2002216401A JP 2002216401 A JP2002216401 A JP 2002216401A JP 2001008642 A JP2001008642 A JP 2001008642A JP 2001008642 A JP2001008642 A JP 2001008642A JP 2002216401 A JP2002216401 A JP 2002216401A
- Authority
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- Japan
- Prior art keywords
- magneto
- optical recording
- weight
- layer
- recording medium
- 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.)
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- Polymerisation Methods In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光磁気記録媒体に
係わり、特にこの光磁気記録媒体に記録再生するヘッド
との潤滑性に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording medium, and more particularly to lubricity with a head for recording and reproducing data on and from the magneto-optical recording medium.
【０００２】[0002]
【従来の技術】一般に、記録可能型光ディスクは、溝や
ピットが形成されている金属原盤（スタンパー）と射出
成形等によって溝とピットが転写されている透明基板上
に有機色素や金属合金薄膜で記録層を形成し、更に、金
属反射層、高分子樹脂による保護層からなり、例えば、
特開平６−２５９８２６号公報や特開平７−６４１８号
公報に開示されているものがある。2. Description of the Related Art Generally, a recordable optical disk is made of an organic dye or a metal alloy thin film on a metal master (stamper) having grooves and pits formed thereon and a transparent substrate on which the grooves and pits are transferred by injection molding or the like. Forming a recording layer, further comprising a metal reflective layer, a protective layer of a polymer resin, for example,
Some are disclosed in JP-A-6-259826 and JP-A-7-6418.
【０００３】特開平６−２５９８２６号公報には、基板
上に光磁気記録層と、耐擦傷性保護層と、金属反射層と
が順次形成されてなり、この耐擦傷性保護層をペンタエ
リストールのトリアクリレート及びテトラアクリレート
の混合物を１０〜９０重量％含有する硬化性樹脂にする
と、耐擦傷性及び耐候性に優れ、浮上ヘッドによる傷の
発生を抑え、ヘッドクラッシュや発塵を防いだ光磁気記
録媒体を得ることができることが開示されている。ま
た、特開平７−６４１８号公報には、円板状基板上に金
属反射層を含む光磁気記録層と、保護層とが順次形成さ
れてなり、この保護層が０．１〜５ｗｔ％のカップリン
グ剤を含むようにすると、前記保護層と前記光磁気記録
層との密着性に優れ、ヘッドクラッシュを生じない光磁
気記録媒体を得ることができることが開示されている。Japanese Patent Application Laid-Open No. 6-259826 discloses that a magneto-optical recording layer, a scratch-resistant protective layer, and a metal reflective layer are sequentially formed on a substrate. When a curable resin containing 10 to 90% by weight of a mixture of triacrylate and tetraacrylate is used, it has excellent scratch resistance and weather resistance, suppresses the occurrence of scratches caused by the flying head, and prevents head crash and dust generation. It is disclosed that a recording medium can be obtained. In Japanese Patent Application Laid-Open No. 7-6418, a magneto-optical recording layer including a metal reflective layer and a protective layer are sequentially formed on a disk-shaped substrate, and the protective layer has a thickness of 0.1 to 5 wt%. It is disclosed that when a coupling agent is included, a magneto-optical recording medium that has excellent adhesion between the protective layer and the magneto-optical recording layer and does not cause a head crash can be obtained.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、特開平
６−２５９８２６号公報や特開平７−６４１８号公報に
開示されている光磁気記録媒体では、この光磁気記録媒
体に面接触して用いる記録再生用ヘッドとの十分な潤滑
性が得られないため、ヘッドクラッシュが発生するとい
った問題を生じていた。また、保護層の形成過程で、保
護層中の有機酸と反応して、金属反射層が腐食するとい
った問題を生じていた。この結果、光磁気記録媒体の信
頼性が低かった。However, in the magneto-optical recording medium disclosed in JP-A-6-259826 and JP-A-7-6418, a recording / reproducing method used in surface contact with the magneto-optical recording medium is used. However, since sufficient lubricity with the head is not obtained, there has been a problem that a head crash occurs. Further, in the process of forming the protective layer, there has been a problem that the metal reflective layer is corroded by reacting with the organic acid in the protective layer. As a result, the reliability of the magneto-optical recording medium was low.
【０００５】そこで、本発明は、上記のような問題点を
解消するためになされたもので、良好な潤滑性を有し、
ヘッドクラッシュが発生せず、かつ金属反射層の腐食の
ない光磁気記録媒体を提供することを目的とする。Accordingly, the present invention has been made to solve the above problems, and has good lubricating properties.
It is an object of the present invention to provide a magneto-optical recording medium in which a head crash does not occur and a metal reflection layer does not corrode.
【０００６】[0006]
【課題を解決するための手段】本発明の光磁気記録媒体
における第１の発明は、透明基板上に無機エハンス層
と、光磁気記録層と、無機保護層と、金属反射層と、有
機保護層とが順次形成された光磁気記録媒体において、
前記有機保護層は、４０重量％のアクリレートオリゴマ
ー、２官能アクリレートモノマーと３官能アクリレート
モノマーとが所定割合で配合された４０〜５０重量％の
混合物及び１０〜２０重量％の単官能アクリレートモノ
マーからなる複合混合物と、この複合混合物の合計量を
１００重量％とする時、この複合混合物に対して、４重
量％の光開始剤と、４重量％の潤滑剤とからなる紫外線
硬化樹脂であることを特徴とする。第２の発明は、請求
項１記載の光磁気記録媒体において、前記金属反射層
は、Ａｇ、Ａｌ、Ｃｕ、Ｃｕ‐Ｚｎであることを特徴と
する。A first aspect of the magneto-optical recording medium according to the present invention is to provide an inorganic enhanced layer, a magneto-optical recording layer, an inorganic protective layer, a metal reflective layer, and an organic protective layer on a transparent substrate. In a magneto-optical recording medium in which layers are sequentially formed,
The organic protective layer comprises 40% by weight of an acrylate oligomer, 40 to 50% by weight of a mixture of a bifunctional acrylate monomer and a trifunctional acrylate monomer in a predetermined ratio, and 10 to 20% by weight of a monofunctional acrylate monomer. Assuming that the total amount of the composite mixture and the total amount of the composite mixture is 100% by weight, the ultraviolet curable resin is composed of 4% by weight of a photoinitiator and 4% by weight of a lubricant based on the composite mixture. Features. According to a second aspect, in the magneto-optical recording medium according to the first aspect, the metal reflection layer is made of Ag, Al, Cu, or Cu-Zn.
【０００７】[0007]
【発明の実施の形態】本発明の実施形態の光磁気記録媒
体について図１及び図２、表１を用いて説明する。図１
は、本発明の実施形態の光磁気記録媒体を示す断面図で
ある。図２は、単官能アクリリレートモノマー量と摩擦
力との関係を示す図である。図２中、縦軸は、摩擦力
（ｍＮ）で、横軸は、単官能アクリレートモノマー量
（％）である。表１は、単官能アクリリレートモノマー
量と金属反射層のピンホール数との関係を示す表であ
る。表１中、ピンホール数は０．０１ｍ2当たりの数で
表わしてある。DESCRIPTION OF THE PREFERRED EMBODIMENTS A magneto-optical recording medium according to an embodiment of the present invention will be described with reference to FIGS. Figure 1
1 is a sectional view showing a magneto-optical recording medium according to an embodiment of the present invention. FIG. 2 is a graph showing the relationship between the amount of the monofunctional acrylate monomer and the frictional force. In FIG. 2, the vertical axis represents the frictional force (mN), and the horizontal axis represents the monofunctional acrylate monomer amount (%). Table 1 is a table showing the relationship between the amount of the monofunctional acrylate monomer and the number of pinholes in the metal reflection layer. In Table 1, the number of pinholes is represented by the number per 0.01 m 2 .
【０００８】図１に示すように、本発明の実施形態の光
磁気記録媒体１は、射出成形やフォトポリマー成形等に
よりピットや溝が形成されている透明基板２と、この透
明基板２のピットや溝上にＳｉＮやＳｉＯ2等からなる
厚さ５０ｎｍ〜１００ｎｍの無機エハンス層３と、Ｔｂ
ＦｅＣｏ等からなる厚さ３０ｎｍ〜１００ｎｍの光磁気
記録層４と、ＳｉＮやＳｉＯ2等からなる厚さ５０ｎｍ
〜１００ｎｍの無機保護層５と、Ａｇ、Ａｌ、Ｃｕ、Ｃ
ｕ‐Ｚｎ等からなる厚さ３０ｎｍ〜５０ｎｍの金属反射
層６と、厚さ１〜１０μｍの有機保護層７とが順次積層
された構成を有する。なお、金属反射層６に用いられる
Ａｇ、Ａｌ、Ｃｕ、Ｃｕ‐Ｚｎ等は、一般的にＤＶＤ等
に用いられ、有機酸に腐食を受けやすい金属である。As shown in FIG. 1, a magneto-optical recording medium 1 according to an embodiment of the present invention includes a transparent substrate 2 having pits and grooves formed by injection molding, photopolymer molding, or the like, and a pit of the transparent substrate 2. An inorganic enhanced layer 3 made of SiN, SiO 2 or the like having a thickness of 50 nm to 100 nm
A magneto-optical recording layer 4 made of FeCo or the like and having a thickness of 30 nm to 100 nm, and a thickness of 50 nm made of SiN or SiO 2 or the like;
~ 100 nm inorganic protective layer 5, Ag, Al, Cu, C
It has a configuration in which a metal reflective layer 6 made of u-Zn or the like and having a thickness of 30 nm to 50 nm and an organic protective layer 7 having a thickness of 1 to 10 μm are sequentially laminated. In addition, Ag, Al, Cu, Cu-Zn, etc. used for the metal reflection layer 6 are generally used for DVDs and the like, and are metals which are easily corroded by organic acids.
【０００９】有機保護層７は、４０重量％のアクリリレ
ートオリゴマー、２官能アクリレートモノマーと３官能
アクリレートモノマーとが所定割合で配合された４０重
量％〜５０重量％の混合物及び１０〜２０重量％の単官
能アクリレートモノマーからなる複合混合物と、この複
合混合物の合計量を１００重量％とする時、この複合混
合物に対して、４重量％の光開始剤と、４重量％の潤滑
剤とを有する紫外線硬化樹脂組成物である。The organic protective layer 7 comprises a mixture of 40% by weight to 50% by weight and a mixture of 40% by weight of an acrylate oligomer, a bifunctional acrylate monomer and a trifunctional acrylate monomer in a predetermined ratio, and 10% to 20% by weight. Ultraviolet light having 4% by weight of a photoinitiator and 4% by weight of a lubricant based on the composite mixture, where the total amount of the composite mixture is 100% by weight. It is a cured resin composition.
【００１０】ここで、アクリレートオリゴマーはエポキ
シノボラックアクリレート、２官能アクリレートモノマ
ーはジプロピレングリコールジアクリレート、３官能ア
クリレートモノマーはエトキシ化トリメチロールプロパ
ントリアクリレート、単官能アクリレートモノマーはイ
ソボルニルアクリレート、光開始剤はαヒドロキシケト
ン、潤滑剤はポリエーテル変性シリコン高分子である。The acrylate oligomer is epoxy novolak acrylate, the bifunctional acrylate monomer is dipropylene glycol diacrylate, the trifunctional acrylate monomer is ethoxylated trimethylolpropane triacrylate, the monofunctional acrylate monomer is isobornyl acrylate, and the photoinitiator. Is α-hydroxyketone, and the lubricant is a polyether-modified silicone polymer.
【００１１】記録再生を行うヘッドを光磁気記録媒体１
に面接触して動作させる際の潤滑性は、有機保護層７中
の潤滑剤が光磁気記録媒体１の表面に滲み出てくること
によって得られる。ヘッドがヘッドクラッシュを生じる
ことなく、記録再生を行うためには、このヘッドと光磁
気記録媒体の摩擦力は、０．８ｍＮ以下にすることが実
験的に確かめられている。このため、この摩擦力は、
０．８ｍＮ以下にする必要がある。The recording / reproducing head is a magneto-optical recording medium 1
The lubricating property at the time of operating in surface contact is obtained by the lubricant in the organic protective layer 7 oozing out on the surface of the magneto-optical recording medium 1. It has been experimentally confirmed that the frictional force between the head and the magneto-optical recording medium should be 0.8 mN or less so that the head can perform recording and reproduction without causing head crash. Therefore, this frictional force is
It needs to be 0.8 mN or less.
【００１２】そこで、単官能アクリレートモノマー量を
変化させた有機保護層７の各試料を作製し、この潤滑性
について調べた。各試料は、厚さ１．２ｍｍのポリカー
ボネート樹脂基板上に厚さ５０ｎｍのＳｉＮを形成し、
このＳｉＮ上に単官能アクリレートモノマー量を変化さ
せた有機保護層７を形成したものである。[0012] Then, each sample of the organic protective layer 7 in which the amount of the monofunctional acrylate monomer was changed was prepared, and its lubricity was examined. Each sample formed 50 nm thick SiN on a 1.2 mm thick polycarbonate resin substrate,
An organic protective layer 7 in which the amount of monofunctional acrylate monomer was changed was formed on this SiN.
【００１３】潤滑性は、チタン酸カルシュウムからなる
２．２×３．３ｍｍの面接触ヘッドを用いて、これらの
試料の表面を線速１．５ｍ／ｓ、荷重５ｇで３０分間摺
動させて、その時の摩擦力を調べることによって評価し
た。その結果を図２に示す。The lubricity was determined by sliding the surfaces of these samples at a linear velocity of 1.5 m / s and a load of 5 g for 30 minutes using a 2.2 × 3.3 mm surface contact head made of calcium titanate. Evaluation was made by examining the frictional force at that time. The result is shown in FIG.
【００１４】図２に示すように、単官能アクリレートモ
ノマーの添加量が１０〜２０重量％の範囲である時、摩
擦力は、０．８ｍＮ以下となり、ヘッドクラッシュを生
じなかった。また、これ以外の範囲では、摩擦力は、
０．８ｍＮ以上となり、ヘッドクラッシュを生じた。こ
れは、有機保護層７中の潤滑剤が表面に液体状となって
滲み出すぎ、ヘッドが潤滑剤中に浸り、アクリレートオ
リゴマーの境界潤滑がなくなったことによると考えられ
る。この結果、単官能アクリレートモノマー量は、１０
〜２０重量％が最も良いことがわかった。As shown in FIG. 2, when the amount of the monofunctional acrylate monomer was in the range of 10 to 20% by weight, the frictional force was 0.8 mN or less, and no head crash occurred. In other ranges, the friction force is
0.8 mN or more, causing a head crash. This is considered to be because the lubricant in the organic protective layer 7 became too liquid and oozed out on the surface, so that the head was immersed in the lubricant, and boundary lubrication of the acrylate oligomer was lost. As a result, the amount of the monofunctional acrylate monomer was 10
-20% by weight was found to be best.
【００１５】次に、ポリカーボネート樹脂基板に形成さ
れた金属反射層６上に官能アクリレートモノマー量を０
〜６０％の範囲で変化させた有機保護層７を塗布した各
試料を作製して、金属反射層６の腐食性について調べ
た。腐食性は、金属反射層６として、Ａｇを用い、有機
保護層７中の有機酸によって腐食された金属反射層６の
ピンホール数を有機保護層７の上方から測定することに
よって調べた。ピンホール数が全くない場合には、腐食
性無し、ある場合には、腐食性有りとした。Next, the amount of the functional acrylate monomer is reduced to 0 on the metal reflection layer 6 formed on the polycarbonate resin substrate.
Each sample coated with the organic protective layer 7 changed in the range of ６０60% was prepared, and the corrosiveness of the metal reflective layer 6 was examined. The corrosiveness was examined by using Ag as the metal reflective layer 6 and measuring the number of pinholes of the metal reflective layer 6 corroded by the organic acid in the organic protective layer 7 from above the organic protective layer 7. When there were no pinholes, there was no corrosiveness, and in some cases, there was corrosiveness.
【００１６】各試料の有機保護層７は、４０重量％のア
クリレートオリゴマー、２官能アクリレートモノマーと
３官能アクリレートモノマーとが１：１に配合された５
０重量％の混合物及び単官能アクリレートモノマーとか
らなる複合混合物と、この複合混合物の合計量を１００
重量％とする時、この複合混合物に対して、４重量％の
光開始剤と、４重量％の潤滑剤とからなり、前記した単
官能アクリレートモノマーの範囲を０〜６０重量％にし
たものである。The organic protective layer 7 of each sample was prepared by mixing 40% by weight of acrylate oligomer, bifunctional acrylate monomer and trifunctional acrylate monomer in a ratio of 1: 1.
0% by weight of the mixture and the monofunctional acrylate monomer, and the total amount of the
% By weight, based on the composite mixture, 4% by weight of a photoinitiator and 4% by weight of a lubricant, wherein the range of the monofunctional acrylate monomer is 0 to 60% by weight. is there.
【００１７】その結果を表１に示す。Table 1 shows the results.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１に示すように、単官能アクリレートモ
ノマー量が１０％重量以上の時、ピンホールは全くな
く、腐食が全くないことがわかった。この結果、単官能
アクリレートモノマー量が１０重量％以上有する有機保
護層７を用いると、金属反射層６が腐食されないことが
わかった。なお、２官能アクリレートモノマーと３官能
アクリレートモノマーの混合物は５０重量％としたが、
４０重量％〜５０重量％の範囲でも同様な結果が得られ
た。なお、金属反射層６としてＡｇの代わりに、Ａｌ、
Ｃｕ、Ｃｕ‐Ｚｎを用いても同様な結果が得られた。As shown in Table 1, when the amount of the monofunctional acrylate monomer was 10% by weight or more, it was found that there was no pinhole and no corrosion. As a result, it was found that when the organic protective layer 7 having a monofunctional acrylate monomer content of 10% by weight or more was used, the metal reflective layer 6 was not corroded. Although the mixture of the bifunctional acrylate monomer and the trifunctional acrylate monomer was 50% by weight,
Similar results were obtained in the range of 40% to 50% by weight. In addition, instead of Ag, Al,
Similar results were obtained using Cu and Cu-Zn.
【００２０】以上のように、有機保護層７は、４０重量
％のアクリリレートオリゴマー、２官能アクリレートモ
ノマーと３官能アクリレートモノマーとが１：１に配合
された５０重量％の混合物及び１０〜２０重量％の単官
能アクリレートモノマーからなる複合混合物と、この複
合混合物を１００重量％とする時、この複合混合物に対
して、４重量％の光開始剤と、４重量％の潤滑剤とを含
む紫外線硬化樹脂組成物であるので、良好な潤滑性を有
し、ヘッドクラッシュの発生がなく、かつ金属反射層の
腐食のない光磁気記録媒体１を得ることができる。As described above, the organic protective layer 7 is composed of 40% by weight of a 50% by weight mixture of a 1: 1 mixture of an acrylate oligomer, a bifunctional acrylate monomer and a trifunctional acrylate monomer, and 10 to 20% by weight. % Of a monofunctional acrylate monomer, and UV curing containing 4% by weight of a photoinitiator and 4% by weight of a lubricant based on the composite mixture when the composite mixture is 100% by weight. Since it is a resin composition, it is possible to obtain a magneto-optical recording medium 1 having good lubricity, no head crash, and no corrosion of the metal reflective layer.
【００２１】[0021]
【発明の効果】本発明の光磁気記録媒体によれば、透明
基板上に無機エハンス層と、光磁気記録層と、無機保護
層と、金属反射層と、有機保護層とが順次形成された光
磁気記録媒体において、前記有機保護層は、４０重量％
のアクリレートオリゴマー、２官能アクリレートモノマ
ーと３官能アクリレートモノマーとが所定割合で配合さ
れた４０〜５０重量％の混合物及び１０〜２０重量％の
単官能アクリレートモノマーからなる複合混合物と、こ
の複合混合物の合計量を１００重量％とする時、この複
合混合物に対して、４重量％の光開始剤と、４重量％の
潤滑剤とからなる紫外線硬化樹脂であるので、良好な潤
滑性を有し、ヘッドクラッシュがなく、かつ金属反射層
の腐食のない光磁気記録媒体を得ることができる。According to the magneto-optical recording medium of the present invention, an inorganic enhancing layer, a magneto-optical recording layer, an inorganic protective layer, a metal reflective layer, and an organic protective layer are sequentially formed on a transparent substrate. In the magneto-optical recording medium, the organic protective layer is 40% by weight.
Acrylate oligomer, a bifunctional acrylate monomer and a trifunctional acrylate monomer compounded in a predetermined ratio, a mixture of 40 to 50% by weight and a composite mixture of 10 to 20% by weight of a monofunctional acrylate monomer, and a total of the composite mixture When the amount is 100% by weight, the composite mixture is an ultraviolet curable resin composed of 4% by weight of a photoinitiator and 4% by weight of a lubricant, so that the head has good lubricity, It is possible to obtain a magneto-optical recording medium free from crashes and free from corrosion of the metal reflection layer.
【図１】本発明の実施形態の光磁気記録媒体を示す断面
図である。FIG. 1 is a sectional view showing a magneto-optical recording medium according to an embodiment of the present invention.
【図２】単官能アクリリレートモノマー量と摩擦力との
関係を示す図である。FIG. 2 is a graph showing the relationship between the amount of monofunctional acrylate monomer and frictional force.
１…光磁気記録媒体、２…透明基板、３…無機エハンス
層、４…光磁気記録層、５…無機保護層、６…金属反射
層、７…有機保護層DESCRIPTION OF SYMBOLS 1 ... Magneto-optical recording medium, 2 ... Transparent substrate, 3 ... Inorganic enhancement layer, 4 ... Magneto-optical recording layer, 5 ... Inorganic protective layer, 6 ... Metal reflective layer, 7 ... Organic protective layer
Claims (2)
記録層と、無機保護層と、金属反射層と、有機保護層と
が順次形成された光磁気記録媒体において、 前記有機保護層は、４０重量％のアクリレートオリゴマ
ー、２官能アクリレートモノマーと３官能アクリレート
モノマーとが所定割合で配合された４０〜５０重量％の
混合物及び１０〜２０重量％の単官能アクリレートモノ
マーからなる複合混合物と、この複合混合物の合計量を
１００重量％とする時、この複合混合物に対して、４重
量％の光開始剤と、４重量％の潤滑剤とからなる紫外線
硬化樹脂であることを特徴とする光磁気記録媒体。1. A magneto-optical recording medium comprising a transparent substrate, on which an inorganic enhancement layer, a magneto-optical recording layer, an inorganic protective layer, a metal reflective layer, and an organic protective layer are sequentially formed. A composite mixture of 40 to 50% by weight of a mixture of 40% by weight of an acrylate oligomer, a bifunctional acrylate monomer and a trifunctional acrylate monomer in a predetermined ratio, and 10 to 20% by weight of a monofunctional acrylate monomer; When the total amount of the composite mixture is 100% by weight, the light is characterized by being an ultraviolet curable resin comprising 4% by weight of a photoinitiator and 4% by weight of a lubricant with respect to the composite mixture. Magnetic recording medium.
ｕ‐Ｚｎであることを特徴とする請求項１記載の光磁気
記録媒体。2. The metal reflection layer is made of Ag, Al, Cu, C
2. The magneto-optical recording medium according to claim 1, wherein the magneto-optical recording medium is u-Zn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001008642A JP2002216401A (en) | 2001-01-17 | 2001-01-17 | Magneto-optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001008642A JP2002216401A (en) | 2001-01-17 | 2001-01-17 | Magneto-optical recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002216401A true JP2002216401A (en) | 2002-08-02 |
Family
ID=18876230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001008642A Pending JP2002216401A (en) | 2001-01-17 | 2001-01-17 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002216401A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7092318B2 (en) | 2002-01-11 | 2006-08-15 | Victor Company Of Japan, Limited | Magneto-optical recording medium having a plurality of magnetic layers |
| US7126884B2 (en) | 2002-01-11 | 2006-10-24 | Victor Company Of Japan, Limited | Magneto-optical recording medium having multiple magnetic layers |
| US7916382B2 (en) | 2004-11-10 | 2011-03-29 | Photon Dynamics, Inc. | Scratch and MAR resistant PDLC modulator |
| US8801964B2 (en) | 2010-12-22 | 2014-08-12 | Photon Dynamics, Inc. | Encapsulated polymer network liquid crystal material, device and applications |
-
2001
- 2001-01-17 JP JP2001008642A patent/JP2002216401A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7092318B2 (en) | 2002-01-11 | 2006-08-15 | Victor Company Of Japan, Limited | Magneto-optical recording medium having a plurality of magnetic layers |
| US7126884B2 (en) | 2002-01-11 | 2006-10-24 | Victor Company Of Japan, Limited | Magneto-optical recording medium having multiple magnetic layers |
| US7916382B2 (en) | 2004-11-10 | 2011-03-29 | Photon Dynamics, Inc. | Scratch and MAR resistant PDLC modulator |
| US8801964B2 (en) | 2010-12-22 | 2014-08-12 | Photon Dynamics, Inc. | Encapsulated polymer network liquid crystal material, device and applications |
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