JPS61145746A - Optical recording and reproducing medium - Google Patents
Optical recording and reproducing mediumInfo
- Publication number
- JPS61145746A JPS61145746A JP59267325A JP26732584A JPS61145746A JP S61145746 A JPS61145746 A JP S61145746A JP 59267325 A JP59267325 A JP 59267325A JP 26732584 A JP26732584 A JP 26732584A JP S61145746 A JPS61145746 A JP S61145746A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layer
- base body
- cylinder
- transparent
- 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
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
-
- 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0025—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cylinders or cylinder-like carriers or cylindrical sections or flat carriers loaded onto a cylindrical surface, e.g. truncated cones
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光記録媒体、さらに詳しくはレーザー光利用円
筒状記録再生媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording medium, and more particularly to a cylindrical recording and reproducing medium using laser light.
レーザー光を利用して記録および再生を行う方式には現
在大別して２方式があり、その１つはレーザー光により
微細なスポットを形成し、その熱によって垂直磁化膜の
温度を上昇させ１周囲の磁界の働きによりそのスポット
の磁化方向を反転させて記録し、再生時はそのスポット
にレーザー光を当て、その偏光角の変化によって情報を
読み出す光磁気記録媒体を使用する方式であり、他の１
つは感光層にレーザ１−光を当てて穴をあけ又は感光層
の反射率を変えて情報を記録し再生する感光層記録媒体
を使用する方式である。Currently, there are two main methods of recording and reproducing using laser light. One of them is to form a minute spot with laser light, and the heat increases the temperature of the perpendicularly magnetized film. This method uses a magneto-optical recording medium in which the direction of magnetization of the spot is reversed by the action of a magnetic field, and during reproduction, a laser beam is applied to the spot and information is read out by changing the polarization angle.
One method uses a photosensitive layer recording medium in which information is recorded and reproduced by exposing the photosensitive layer to a laser beam and making holes or by changing the reflectance of the photosensitive layer.
しかして何れの方式においても記録媒体の形状は円盤状
（ディスクタイプ）および円筒状（シリンダタイプ）が
考えられる。In either method, the shape of the recording medium can be a disk shape (disk type) or a cylindrical shape (cylinder type).
ディスクタイプは以下のような欠点を有する。The disk type has the following drawbacks.
！、ディスクを一定回転速度で回転させた場合（角速度
一定）（Ｃ：、Ａ、Ｖ、）内周と外周で線速度が変化す
るため、記録再生条件を一定にすることができない。! When the disk is rotated at a constant rotational speed (constant angular velocity) (C:, A, V,), the linear velocity changes between the inner and outer circumferences, so it is impossible to keep the recording and reproducing conditions constant.
２、同様にＣ，Ａ、Ｖ、の場合、記録部単位長さ当りの
記Ｑ密度は最内周部で決まり、書き込みのレーザーパワ
ーは最外周部の線速度に対応する必要があるため、ロス
が大きい。2.Similarly, in the case of C, A, and V, the recording Q density per unit length of the recording section is determined at the innermost periphery, and the laser power for writing needs to correspond to the linear velocity at the outermost periphery. The loss is large.
３、回転速度を回転軸中心から記録部の距ａｌ（半径）
に応じて変化させる方式すなわち線速度一定（Ｃ，Ｌ、
Ｖ、）ニすると、上記Ｃ，Ａ、Ｖ、１７）場合ノ欠点は
なくなるが、スピンドルモータ制御が複雑になり、また
ヘッドアクセス時間が長くなる。3. The rotation speed is determined by the distance al (radius) of the recording section from the center of the rotation axis.
In other words, the linear velocity is constant (C, L,
V,)2 eliminates the drawbacks of cases C, A, V, and 17), but the spindle motor control becomes complicated and the head access time becomes longer.
一方円筒状では、記Ｑ部の回転軸からの距離は一定であ
るから、回転速度を一定に保つ限りディスクタイプの欠
点は生ずることなく最も効率が良い、しかしながらたと
えば磁気記録の場合に。On the other hand, in a cylindrical shape, the distance from the rotational axis of the Q part is constant, so as long as the rotational speed is kept constant, the disadvantages of the disk type do not occur and the efficiency is the highest.However, for example, in the case of magnetic recording.
シリンダ基体に磁性層を蒸着またはスパッタで成膜した
後、磁性層保護用の透明で複屈折の少ない材料による保
護層を精度よく構成することができなかったため、実用
化されず、上述の欠点にもかかわらずディスクタイプの
使用が主流を占めている。After forming the magnetic layer on the cylinder base by vapor deposition or sputtering, it was not possible to accurately form a protective layer made of a transparent material with low birefringence to protect the magnetic layer. Nevertheless, the use of disc type is the mainstream.
本発明は上記記録媒体の欠点のない光記録媒体を提供す
ることを目的とする。An object of the present invention is to provide an optical recording medium that does not have the drawbacks of the above-mentioned recording media.
Ｃ問題点を解決するための手段〕
本発明の構成は、透明な円筒状基体の片側表面に磁性層
又は感光層を形成し、磁性層又は感光層のない側から集
光したレーザービームを当て、情報の記録、再生を行う
ごとくなした光記録再生媒体である０本発明を図面を用
いて詳細に説明する。Means for Solving Problem C] The structure of the present invention is to form a magnetic layer or a photosensitive layer on one surface of a transparent cylindrical substrate, and apply a focused laser beam from the side without the magnetic layer or photosensitive layer. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention, which is an optical recording/reproducing medium for recording and reproducing information, will be explained in detail with reference to the drawings.
第１図は本発明の詳細な説明する要部断面図であり、第
２図はその斜視図である。透明な円筒基体ｌの内側に磁
性膜（記録層）２を蒸着、スパッタリングまたはディッ
ピングなどの公知の方法で成膜し、さらにその上面に保
護膜３を成膜する。FIG. 1 is a sectional view of a main part explaining the present invention in detail, and FIG. 2 is a perspective view thereof. A magnetic film (recording layer) 2 is formed on the inside of a transparent cylindrical substrate 1 by a known method such as vapor deposition, sputtering, or dipping, and a protective film 3 is further formed on its upper surface.
記録および再生は透明な基体１の磁性膜の層着されてい
ない側すなわち第１図においては円筒基体の外側に位置
する光学へラド４により、対物レンズアクチュエータ５
を通して集光されたレーザービーム７が、透明な基体１
を通して記録層２に焦点を合わせることによってなされ
る。光学へラド４は、ベアリング１０によって支えられ
１図示しない駆動部によって回転される前記円筒の半径
方向には前述のフォーカシングを１円筒の母線方向には
トラッキングを行う、トラッキングは送りネジ８とステ
ッピングモータ９により行われる。６はバイアス用電磁
石である。Recording and reproduction are performed by an objective lens actuator 5 by an optical disc 4 located on the side of the transparent base 1 on which the magnetic film is not layered, that is, on the outside of the cylindrical base in FIG.
A laser beam 7 focused through the transparent substrate 1
This is done by focusing on the recording layer 2 through the lens. The optical helad 4 performs the above-mentioned focusing in the radial direction of the cylinder supported by a bearing 10 and rotated by a drive unit (not shown), and tracking in the generatrix direction of the cylinder.The tracking is performed by a feed screw 8 and a stepping motor. 9. 6 is a bias electromagnet.
前述の如く、レーザービームは基体を通して記鎧、再生
を行うため、基体は透明で且つ光学的に均質な材料であ
ることが要求され、基体材料としては、ガラス、ポリカ
ーボネート樹脂、およびポリメチルメタクリル樹脂等が
好ましい、また基体は円筒形を保持したまま回転するた
めに必要な充分な強度が要求され、したがってその厚さ
は０．５ｍｍ〜２ｍｍが好ましい、保護膜３は単に記録
層をゴミやキズから保護すれば足りるので、特別な光学
的条件は不要であり、厚さ２０ＪＩｊ〜１００μ程度の
樹脂フィルム例えばポリカーボネートフィルム又はＳｉ
ＯやＺｎＳの蒸着膜で膜厚数百〜数千Ａ等を用いること
ができる。As mentioned above, since the laser beam performs recording and reproduction through the substrate, the substrate is required to be a transparent and optically homogeneous material, and examples of the substrate material include glass, polycarbonate resin, and polymethyl methacrylic resin. In addition, the substrate is required to have sufficient strength necessary to rotate while maintaining its cylindrical shape, so its thickness is preferably 0.5 mm to 2 mm. The protective film 3 simply protects the recording layer from dust and scratches. There is no need for special optical conditions as it is sufficient to protect the film from
A vapor deposited film of O or ZnS having a thickness of several hundred to several thousand amps can be used.
第３図は本発明の他の例で、透明円筒基体１の外側に磁
性膜２を成膜し、その上面に保護膜３を成膜した構成で
ある。この場合光学的ヘッド４は本発明の構成により円
筒の内側に位置し、装置がコンパクトになると共に、円
筒の外側に遂次成膜してゆくため、成膜操作が容易であ
るという利点がある。FIG. 3 shows another example of the present invention, in which a magnetic film 2 is formed on the outside of a transparent cylindrical substrate 1, and a protective film 3 is formed on the upper surface thereof. In this case, the optical head 4 is located inside the cylinder due to the structure of the present invention, which makes the apparatus compact, and there is an advantage that the film forming operation is easy because the film is sequentially formed on the outside of the cylinder. .
上記２例は何れも光磁気記録媒体について説明したが、
感光層記録媒体の場合も、磁気的な部分を除けば全く同
様である。In both of the above two examples, magneto-optical recording media were explained.
The same applies to photosensitive layer recording media, except for the magnetic part.
本発明により従来欠点とされた保護層の問題点が解決さ
れ１機構上ディスクタイプ媒体よりすぐれたシリンダタ
イプの光記録媒体を容易に製作することが可能になった
。The present invention solves the problem of the protective layer, which was considered a drawback in the past, and makes it possible to easily produce a cylinder-type optical recording medium that is mechanically superior to a disk-type medium.
第１図は本発明の説明用要部断面図、第２図は本発明の
説明用斜視図、第３図は本発明の他の例を示す要部断面
図である。
１−−一透明円筒基体、 ２−ｍ−磁性膜、３−ｍ−
保護層、 ４−−一光学ヘッド、５−ｍ一対
物レンズアクチュエータ、
６一−−電磁石。
７−−−レーザービーム。
８−−一送すネジ。
９−一一スチッピングモーター、
１０−ｍ−ベアリング。FIG. 1 is a sectional view of a main part for explaining the present invention, FIG. 2 is a perspective view for explaining the invention, and FIG. 3 is a sectional view of a main part showing another example of the present invention. 1--1 transparent cylindrical substrate, 2-m-magnetic film, 3-m-
protective layer; 4--one optical head; 5--m objective lens actuator; 6--electromagnet. 7---Laser beam. 8--One screw. 9-11 stepping motor, 10-m-bearing.
Claims (1)
し、磁性層又は感光層のない側から集光したレーザービ
ームを当て、情報の記録、再生を行うごとくなした光記
録再生媒体。An optical recording and reproducing medium in which a magnetic layer or a photosensitive layer is formed on one surface of a transparent cylindrical substrate, and information is recorded and reproduced by applying a focused laser beam from the side without the magnetic layer or photosensitive layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59267325A JPS61145746A (en) | 1984-12-20 | 1984-12-20 | Optical recording and reproducing medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59267325A JPS61145746A (en) | 1984-12-20 | 1984-12-20 | Optical recording and reproducing medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61145746A true JPS61145746A (en) | 1986-07-03 |
Family
ID=17443249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59267325A Pending JPS61145746A (en) | 1984-12-20 | 1984-12-20 | Optical recording and reproducing medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61145746A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01256021A (en) * | 1988-04-06 | 1989-10-12 | Alps Electric Co Ltd | Optical recording and reproduction method and its device |
| WO2000055848A1 (en) * | 1999-03-16 | 2000-09-21 | Fond Intellektualnykh Tekhnology | Device for recording, reading and storing information |
| WO2001024172A1 (en) * | 1999-09-24 | 2001-04-05 | Tesa Ag | Data memory |
| KR20020087239A (en) * | 2001-05-15 | 2002-11-22 | 성 운 차 | The Information storage device for cylindrical media using reflector |
| KR20030009843A (en) * | 2001-07-24 | 2003-02-05 | 성 운 차 | Stucture of Cylindrical Optical Pick-up Disk and Manufacturing Method Thereof |
| WO2005086149A1 (en) * | 2004-03-04 | 2005-09-15 | Pioneer Corporation | Process for producing cylindrical recording medium |
| US7024675B1 (en) * | 1999-07-12 | 2006-04-04 | Tesa Ag | Cylindrical optical data memory |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5438481A (en) * | 1977-09-01 | 1979-03-23 | Oki Electric Ind Co Ltd | End station monitoring system |
| JPS58179944A (en) * | 1982-04-15 | 1983-10-21 | Canon Inc | Method and device for recording and reproduction of signal |
-
1984
- 1984-12-20 JP JP59267325A patent/JPS61145746A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5438481A (en) * | 1977-09-01 | 1979-03-23 | Oki Electric Ind Co Ltd | End station monitoring system |
| JPS58179944A (en) * | 1982-04-15 | 1983-10-21 | Canon Inc | Method and device for recording and reproduction of signal |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01256021A (en) * | 1988-04-06 | 1989-10-12 | Alps Electric Co Ltd | Optical recording and reproduction method and its device |
| WO2000055848A1 (en) * | 1999-03-16 | 2000-09-21 | Fond Intellektualnykh Tekhnology | Device for recording, reading and storing information |
| US7024675B1 (en) * | 1999-07-12 | 2006-04-04 | Tesa Ag | Cylindrical optical data memory |
| WO2001024172A1 (en) * | 1999-09-24 | 2001-04-05 | Tesa Ag | Data memory |
| KR20020087239A (en) * | 2001-05-15 | 2002-11-22 | 성 운 차 | The Information storage device for cylindrical media using reflector |
| KR20030009843A (en) * | 2001-07-24 | 2003-02-05 | 성 운 차 | Stucture of Cylindrical Optical Pick-up Disk and Manufacturing Method Thereof |
| WO2005086149A1 (en) * | 2004-03-04 | 2005-09-15 | Pioneer Corporation | Process for producing cylindrical recording medium |
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