JPH0240102A - Magnetic disk - Google Patents
Magnetic diskInfo
- Publication number
- JPH0240102A JPH0240102A JP18841988A JP18841988A JPH0240102A JP H0240102 A JPH0240102 A JP H0240102A JP 18841988 A JP18841988 A JP 18841988A JP 18841988 A JP18841988 A JP 18841988A JP H0240102 A JPH0240102 A JP H0240102A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- layer
- lower layer
- magnetic field
- disk
- 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
- 239000000696 magnetic material Substances 0.000 abstract description 6
- 230000005415 magnetization Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4886—Disposition of heads relative to rotating disc
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気ディスク装置に係り、特に高トラツク密度
化に適した磁気ディスク媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk medium suitable for increasing track density.
磁気ディスク装置の高トラツク密度化のための方法とし
て、特公昭４］、−２５８６に二層構造の媒体が示され
ている。この方法は下層部にヘッドの位置決め用の信号
が記録されており、高い位置決め精度が実現できる。As a method for increasing the track density of a magnetic disk drive, a two-layer structure medium is disclosed in Japanese Patent Publication No. 4], 2586. In this method, signals for positioning the head are recorded in the lower layer, and high positioning accuracy can be achieved.
上記従来技術は、下層部のサーボ信号と上層部のデータ
信号を分離するために、下層部にデータの周波数より低
い周波数の正弦波信号を記録しサーボ信号としているた
め、サーボ信号検出回路が複雑になること、データビッ
トがサーボ信号磁界と干渉するなどの問題があった。In the above conventional technology, in order to separate the servo signal in the lower layer from the data signal in the upper layer, a sine wave signal with a frequency lower than the data frequency is recorded in the lower layer and used as the servo signal, so the servo signal detection circuit is complicated. There were problems such as the data bits interfering with the servo signal magnetic field.
本発明の目的は、二層構造磁気ディスクにおいて、デー
タ信号が下層部の信号磁界の影響を受けない構造の磁気
ディスクを提供することにある。An object of the present invention is to provide a magnetic disk with a two-layer structure in which data signals are not affected by the signal magnetic field of the lower layer.
上記目的は、下層部と上層部の磁性体が、−軸異方性を
有し、下層と上層の磁気異方性の方向が直交している様
に配向している磁気ディスクを用い、かつ、下層、上層
をそれぞれの磁場配向方向に磁化することにより達成さ
れる。The above purpose uses a magnetic disk in which the magnetic bodies of the lower layer and the upper layer have -axis anisotropy and are oriented so that the directions of the magnetic anisotropy of the lower layer and the upper layer are orthogonal, and This is achieved by magnetizing the lower layer and the upper layer in the respective magnetic field orientation directions.
下層と上層の一軸磁気異方性が直交しており、かつ、そ
れぞれの方向に磁気変換器のギャップを有するため、例
えば下層の磁場の方向が上層用のヘッドのギャップ方向
に対して直交するため、上層のヘッドは下層の信号を検
出することはない。The uniaxial magnetic anisotropy of the lower layer and the upper layer are orthogonal, and there are magnetic transducer gaps in each direction; for example, the direction of the magnetic field in the lower layer is orthogonal to the gap direction of the upper layer head. , the head on the upper layer never detects the signal on the lower layer.
また、データの記録においても、データヘッドの磁場は
下層の一軸異方性と直交するため、下層の信号は消去さ
れにくく、また、下層の磁場の方向とデータビットの磁
化の方向が直交するため、下層の磁場によるデータビッ
トのピークシフトも生じない。In addition, when recording data, the magnetic field of the data head is perpendicular to the uniaxial anisotropy of the underlying layer, making it difficult to erase signals in the underlying layer.Also, since the direction of the magnetic field of the underlying layer and the direction of magnetization of the data bits are perpendicular to each other, , there is no peak shift of the data bits due to the underlying magnetic field.
以下、本発明の一実施例を図を用いて説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図、第２図に本発明の磁気ディスク１の配向の様子
を示している。すなわち、ヘッド走向方向に対して、上
層２．下層３それぞれが士約４５゜の方向に磁場配向が
かけられている様子を示している。磁場配向け、磁性粉
を用いるコーティングディスクにおいては、強力な磁場
中で塗料を乾燥することによって行なわれる。すなわち
、下層をまずある方向（例えば走行方向に対して＋４５
゜の方向）の磁場中で配向し、磁性体を固定した後、上
層の磁性体を塗布し、異なった方向（例えば走行方向に
対して一４５°の方向）の磁場中で配向することによっ
て達成される。スパッタディスク等の薄膜ディスクにお
いても、磁場中や斜め蒸着等によって、下層、上層を別
々に異方性を付けることにより達成される。記録、再生
は、上層、下層別々の変換器（ヘッド）を用いて行なわ
れる。FIGS. 1 and 2 show how the magnetic disk 1 of the present invention is oriented. That is, with respect to the head running direction, the upper layer 2. It is shown that each of the lower layers 3 is oriented by a magnetic field in a direction of about 45 degrees. Magnetic field orientation, in coating discs using magnetic powder, is carried out by drying the paint in a strong magnetic field. In other words, the lower layer is first moved in a certain direction (for example, +45 with respect to the running direction).
After fixing the magnetic material by orienting it in a magnetic field in a different direction (for example, 145° direction with respect to the running direction), achieved. Even in thin film disks such as sputter disks, this can be achieved by separately imparting anisotropy to the lower and upper layers in a magnetic field or by oblique evaporation. Recording and reproduction are performed using separate transducers (heads) for the upper and lower layers.
第３図にディスク対向面のヘッドのギャップの様子を概
念的に示している。すなわち、６がデータヘッド、５が
サーボ用ヘッドに対応しており、ギャップの方向が、そ
れぞれ磁場配向の方向にほぼ一致している。FIG. 3 conceptually shows the state of the head gap on the disk facing surface. That is, 6 corresponds to a data head, and 5 corresponds to a servo head, and the direction of the gap substantially coincides with the direction of magnetic field orientation.
サーボ用ヘッドは、下層磁性体にあらかじめ記録された
サーボ信号を再生するヘッドであり、データヘッドは、
データを記録再生するヘッドであり、互いに磁場が直作
することが望ましい。また、各磁性層の磁化の方向は、
それぞれの磁場配向の方向である。The servo head is a head that reproduces servo signals pre-recorded on the lower magnetic material, and the data head is
It is a head that records and reproduces data, and it is desirable that the magnetic fields are directly generated by each other. Also, the direction of magnetization of each magnetic layer is
This is the direction of each magnetic field orientation.
本実施例によれば、データヘッドの記録磁場は、下層の
磁場配向に対して直交するためサーボ信号が消されに＜
＜シたがって、下層の記録領域をデ−タ記録領域に近接
することが出来、サーボ信号の再生効率が向上する。ま
た、データヘッドはそのギャップがサーボ信号磁場に対
して直交するため、サーボ信号をほとんど再生しない。According to this embodiment, the recording magnetic field of the data head is perpendicular to the magnetic field orientation of the underlying layer, so that the servo signal is not erased.
<Therefore, the recording area of the lower layer can be brought close to the data recording area, and the reproduction efficiency of servo signals is improved. Furthermore, the data head hardly reproduces the servo signal because its gap is orthogonal to the servo signal magnetic field.
また、データ記録層の磁場配向方向（記録磁場方向と同
じ）が、サーボ信号磁場方向と直交しているため、デー
タ記録領域はサーボ信号磁場と干渉を生じることもない
。したがって、高いトラック密度のディスク装置に適し
た良好な二層構造ディスクを提供することができる。Further, since the magnetic field orientation direction of the data recording layer (same as the recording magnetic field direction) is orthogonal to the servo signal magnetic field direction, the data recording area does not interfere with the servo signal magnetic field. Therefore, it is possible to provide a disk with a good double layer structure suitable for a disk device with a high track density.
以上述べた様に、本発明は二層媒体各種を別々の方向に
磁場配向を行なったことを特徴としており、磁場配向の
方向、方法等を実施例に限定するものではない。また、
磁気ディスクの種類や磁性体の種類、磁性体の構造（超
構造など）等に対しても限定するものではない。As described above, the present invention is characterized in that various types of two-layer media are oriented with magnetic fields in different directions, and the directions and methods of magnetic field orientation are not limited to the examples. Also,
There is no limitation to the type of magnetic disk, the type of magnetic material, the structure of the magnetic material (superstructure, etc.), etc.
本発明によれば、サーボ信号との干渉のない二層構造デ
ィスクを提供できるので、非常に高いトラック密度のデ
ータ面サーボ方式の磁気ディスクを達成することができ
る。According to the present invention, since it is possible to provide a double-layered disk that does not interfere with servo signals, it is possible to achieve a data surface servo type magnetic disk with a very high track density.
第１図、第２図は本発明の概念構成図、第３図は、本発
明磁気ディスクに適した磁気ヘッドの一例。
１・・・磁気ディスク、２・・・上層磁性体、３・・・
下層磁性体、４・・・基板、５・・・サーボヘッド、６
・・・データへ、ｙ ’ｙ’ ＋
ヘットＺ
Ｎ′；ヅフ０
Ａ′；ヅノ０1 and 2 are conceptual configuration diagrams of the present invention, and FIG. 3 is an example of a magnetic head suitable for the magnetic disk of the present invention. 1... Magnetic disk, 2... Upper magnetic layer, 3...
Lower layer magnetic material, 4... Substrate, 5... Servo head, 6
...to data, y 'y' + head Z N'; zufu 0 A'; zuno 0
Claims (1)
おいて、各層を異なつた方向に磁場配向したことを特徴
とする磁気ディスク。 ２、上記特許請求の範囲１において、ヘッド走向方向に
対して、各層が約±４５°の磁場配向であることを特徴
とする磁気ディスク。[Scope of Claims] 1. A magnetic disk having a two-layer structure in which servo signals are recorded in the lower layer, in which each layer is oriented with a magnetic field in a different direction. 2. The magnetic disk according to claim 1, wherein each layer has a magnetic field orientation of approximately ±45° with respect to the head running direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18841988A JPH0240102A (en) | 1988-07-29 | 1988-07-29 | Magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18841988A JPH0240102A (en) | 1988-07-29 | 1988-07-29 | Magnetic disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0240102A true JPH0240102A (en) | 1990-02-08 |
Family
ID=16223335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18841988A Pending JPH0240102A (en) | 1988-07-29 | 1988-07-29 | Magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0240102A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04182901A (en) * | 1990-11-16 | 1992-06-30 | Nec Gumma Ltd | Magnetic recording system |
-
1988
- 1988-07-29 JP JP18841988A patent/JPH0240102A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04182901A (en) * | 1990-11-16 | 1992-06-30 | Nec Gumma Ltd | Magnetic recording system |
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