JPH0596919U - Information recording medium - Google Patents
Information recording mediumInfo
- Publication number
- JPH0596919U JPH0596919U JP7830591U JP7830591U JPH0596919U JP H0596919 U JPH0596919 U JP H0596919U JP 7830591 U JP7830591 U JP 7830591U JP 7830591 U JP7830591 U JP 7830591U JP H0596919 U JPH0596919 U JP H0596919U
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- recording medium
- information recording
- information
- pits
- 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 20
- 230000005291 magnetic effect Effects 0.000 claims abstract description 16
- 230000035699 permeability Effects 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 239000003302 ferromagnetic material Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 abstract description 4
- 230000005294 ferromagnetic effect Effects 0.000 abstract description 4
- 230000005415 magnetization Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
(57)【要約】
【目的】 基板表面に大きな傷及びゴミが付着しても記
録情報が読み出せる情報記録媒体を提供する。
【構成】 ディスク状或いはカード状の光学的透過性を
有する基板１０と、この基板１０の片面に記録情報に応
じて形成された複数のピット１２と、このピット１２に
埋め込まれた透磁率の高い強磁性体１３と、この強磁性
体１３の表面に成膜された保護膜１４とを設け、強磁性
体１３の磁化状態を磁気ヘッドで検出する。
(57) [Abstract] [Purpose] To provide an information recording medium capable of reading recorded information even if large scratches and dust are attached to the surface of a substrate. [Structure] A disk-shaped or card-shaped substrate 10 having optical transparency, a plurality of pits 12 formed on one surface of the substrate 10 according to recorded information, and a high magnetic permeability embedded in the pits 12. A ferromagnetic body 13 and a protective film 14 formed on the surface of the ferromagnetic body 13 are provided, and the magnetization state of the ferromagnetic body 13 is detected by a magnetic head.
Description
【０００１】[0001]
本考案は光ディスク，光カードなどの情報記録媒体の改良に関する。 The present invention relates to improvement of information recording media such as optical disks and optical cards.
【０００２】[0002]
従来、この種の記録媒体は図２に示すコンパクトディスク（以下、ＣＤと称す ），ビデオディスク，ＣＤ−ＲＯＭに代表されるように、ポリカーボネート，ポ リメチルメタクリレート及びエポキシなどの光透過性のあるデイスク基板２１に 記録情報に応じて凹凸状のピット２０を形成して、このピット２０が形成された 基板表面にアルミニューム及び金などの反射膜２２を成膜し、このピット２０に 光ヘッドからレーザー光を照射して、その反射総光量の変化により記録された情 報を再生していた。 2. Description of the Related Art Conventionally, this type of recording medium has a light-transmitting property such as polycarbonate, polymethylmethacrylate and epoxy as represented by a compact disc (hereinafter referred to as CD), a video disc and a CD-ROM shown in FIG. An uneven pit 20 is formed on the disk substrate 21 according to the recorded information, and a reflective film 22 such as aluminum and gold is formed on the surface of the substrate on which the pit 20 is formed. By irradiating a laser beam, the recorded information was reproduced by the change in the total reflected light amount.
【０００３】 また、特開昭６３−２６９３５６，６３−２７９４４９，６３−３０６５３５ 号公報に開示されるように、記録媒体の光透過性のあるデイスク基板上にに回転 速度情報及び番地情報などのＩＤ情報が予め凹凸状のピットにて形成されたＩＤ トラック（ランド部）と、このＩＤトラックに隣接してデータトラック（グルー ブ部）を形成して、この基板表面に希土類−遷移金属のアモルファス合金からな る磁性膜（光磁気記録膜）をスパッタリング或いは蒸着などにより成膜したもの 。更に特開平１−１４４２５２，２−９１８４１号公報に開示されるように、よ り一層記憶容量を増大することを目的として、ＣＤ，ビデオディスク，ＣＤ−Ｒ ＯＭなどと同様に１／４波長深さのピットでＲＯＭ信号が形成されている光透過 性のあるデイスク基板の反射膜兼記録膜を希土類−遷移金属のアモルファス合金 からなる磁性膜で構成して、ユーザが記録するＲＡＭ情報を光磁気記録で記録膜 （磁性膜）上に書き込み、ＲＯＭ情報はＣＤプレーヤなどと同様に反射総光量の 変化として再生し、ＲＡＭ情報は光磁気デイスクプレーヤなどと同様にカー効果 による反射光の偏光面のカー回転角を検出して再生するものが考えられている。Further, as disclosed in Japanese Patent Laid-Open No. 63-269356, 63-279449, 63-306535, IDs such as rotational speed information and address information are provided on a disc substrate having a light transmitting property of a recording medium. An ID track (land portion) in which information is formed in advance by uneven pits and a data track (groove portion) are formed adjacent to the ID track, and an amorphous alloy of a rare earth-transition metal is formed on the surface of the substrate. A magnetic film (magneto-optical recording film) consisting of a film formed by sputtering or vapor deposition. Further, as disclosed in Japanese Patent Application Laid-Open No. 1-144252, 2-91841, for the purpose of further increasing the storage capacity, a 1/4 wavelength depth like a CD, a video disk, a CD-ROM, etc. The ROM film is formed by the pits, and the reflective film and recording film of the optically transparent disk substrate is composed of a magnetic film made of an amorphous alloy of rare earth-transition metal, and RAM information recorded by the user is magneto-optical. Writing is performed on the recording film (magnetic film), ROM information is reproduced as a change in the total reflected light amount as in a CD player, and RAM information is displayed as a plane of polarization of reflected light due to the Kerr effect as in a magneto-optical disk player. It is considered that the car rotation angle is detected and reproduced.
【０００４】[0004]
上述の記録媒体は凹凸のピットからの反射光を電気信号に変換して記録情報を 読み込んでいる。従って、光を用いて読出を行なっているので、光の入射及び反 射面側に大きな傷が付いたりゴミなどが付着すると記録情報の読出が不可能にな るケースがあった。 The above-mentioned recording medium reads the recorded information by converting the reflected light from the concave and convex pits into an electric signal. Therefore, since the reading is performed using light, there is a case where the reading of recorded information becomes impossible when the light is incident and the reflection surface side is greatly scratched or dust is attached.
【０００５】 それ故に、本考案の目的は基板表面に大きな傷及びゴミが付着しても記録情報 が読み出せる情報記録媒体を提供することにある。Therefore, an object of the present invention is to provide an information recording medium capable of reading recorded information even if large scratches and dust are attached to the substrate surface.
【０００６】[0006]
従って、本考案は上述の目的を達成するために、光学的透過性を有する基板と 、この基板の片面に記録情報に応じて形成された複数のピットと、このピットに 埋め込まれた透磁率の高い強磁性体と、この強磁性体の表面に成膜された保護膜 とを設けたものである。 Therefore, in order to achieve the above-mentioned object, the present invention provides an optically transparent substrate, a plurality of pits formed on one surface of the substrate according to recorded information, and magnetic permeability embedded in the pits. A high ferromagnetic material and a protective film formed on the surface of this ferromagnetic material are provided.
【０００７】 また、前記基板は円板状或いはカード状に形成されたものである。Further, the substrate is formed in a disc shape or a card shape.
【０００８】[0008]
上記のように構成された情報記録媒体を、回転起動させ、同時に数百エルステ ッドの弱磁場を印加することで透磁率の高い強磁性体は磁化される。また、この 磁化された部分にコイルの巻かれたピックアップ針（磁気ヘッド）を走らせれば 、この磁化の有無で符号化された情報を電気信号として取り出すことが出来る。 The information recording medium having the above-described structure is rotationally activated, and at the same time, a weak magnetic field of several hundreds of elds is applied to magnetize the ferromagnetic material having a high magnetic permeability. If a pickup needle (magnetic head) with a coil wound around this magnetized portion is run, information encoded depending on the presence or absence of this magnetization can be taken out as an electric signal.
【０００９】[0009]
次に、本考案の一実施例について図１を参照して説明する。図１は本考案の情 報記録媒体の要部断面図を示し、光ディスク仕様のディスク状のポリカーボネー ト，ポリメチルメタクリレート，エポキシなどのプラスチックまたはガラス、石 英などの光透過性のある材料からなる非磁性の板（基板）１０のラウンド面１１ にレッドブックに準拠した情報のピット１２を形成し、このピット１２に透磁率 の高い強磁性体１３を埋め込み、このピット状の透磁率の高い強磁性体１３が酸 化しにくいように酸化しにくい非磁性物質１４を保護膜として数十から数ミクロ ン蒸着或いはスパッタリングにより成膜した構造を有する。 透磁率の高い強磁性体１３は純度の高い鉄、コバルト、ニッケル、センダストな どが適している。酸化しにくい非磁性物質（保護膜）１４は、人工ダイアモンド 、窒化シリコン、酸化シリコンなどが適している。 また、上記基板１０はデイスク状以外にカード状に形成されていても良いことは 言うまでもない。 Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of an essential part of the information recording medium of the present invention, which is made of a disc-shaped polycarbonate of optical disc type, plastic such as polymethylmethacrylate, epoxy, or glass or light-transmissive material such as stone. A pit 12 of information conforming to the Red Book is formed on the round surface 11 of the non-magnetic plate (substrate) 10, and a ferromagnetic material 13 having a high magnetic permeability is embedded in the pit 12, and the pit-shaped high magnetic permeability is formed. It has a structure in which a non-magnetic substance 14 that is hard to oxidize so that the ferromagnetic substance 13 is hard to oxidize is used as a protective film and is formed by vapor deposition or sputtering of several tens to several microns. As the ferromagnetic material 13 having a high magnetic permeability, iron, cobalt, nickel, sendust and the like having a high purity are suitable. As the non-magnetic substance (protective film) 14 that is difficult to oxidize, artificial diamond, silicon nitride, silicon oxide, etc. are suitable. Needless to say, the substrate 10 may be formed in a card shape other than the disk shape.
【００１０】[0010]
本考案は、以上説明したように構成されているので、情報記録媒体の表面に付 いた大きな傷やゴミにより情報の読出が不可能になることが少なくなる効果があ る。 Since the present invention is configured as described above, there is an effect that it becomes difficult to read information due to large scratches or dust on the surface of the information recording medium.
【図面の簡単な説明】[Brief description of drawings]
【図１】本考案の情報記録媒体を示す一部断面図であ
る。FIG. 1 is a partial cross-sectional view showing an information recording medium of the present invention.
【図２】従来の情報記録媒体を示す一部断面図である。FIG. 2 is a partial cross-sectional view showing a conventional information recording medium.
１０ 基板 １１ ラウンド面 １２，２０ ピット １３ 強磁性体 １４ 保護膜 ２１ ディスク基板 ２２ 反射膜 10 Substrate 11 Round Surface 12,20 Pit 13 Ferromagnetic Material 14 Protective Film 21 Disk Substrate 22 Reflective Film
Claims (3)
の片面に記録情報に応じて形成された複数のピットと、
このピットに埋め込まれた透磁率の高い強磁性体と、こ
の強磁性体の表面に成膜された保護膜とを設けたことを
特徴とする情報記録媒体。1. A substrate having optical transparency, and a plurality of pits formed on one surface of the substrate according to recorded information,
An information recording medium comprising: a ferromagnetic material having a high magnetic permeability embedded in the pit; and a protective film formed on the surface of the ferromagnetic material.
徴とする請求項１記載の情報記録媒体。2. The information recording medium according to claim 1, wherein the substrate is formed in a disc shape.
特徴とする請求項１記載の情報記録媒体。3. The information recording medium according to claim 1, wherein the substrate is formed in a card shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7830591U JPH0596919U (en) | 1991-09-27 | 1991-09-27 | Information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7830591U JPH0596919U (en) | 1991-09-27 | 1991-09-27 | Information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0596919U true JPH0596919U (en) | 1993-12-27 |
Family
ID=13658220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7830591U Pending JPH0596919U (en) | 1991-09-27 | 1991-09-27 | Information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0596919U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5753846A (en) * | 1980-09-16 | 1982-03-31 | Toppan Printing Co Ltd | Information recording carrier |
-
1991
- 1991-09-27 JP JP7830591U patent/JPH0596919U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5753846A (en) * | 1980-09-16 | 1982-03-31 | Toppan Printing Co Ltd | Information recording carrier |
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