JPH0616321B2 - Magnetic recording device - Google Patents
Magnetic recording deviceInfo
- Publication number
- JPH0616321B2 JPH0616321B2 JP17450186A JP17450186A JPH0616321B2 JP H0616321 B2 JPH0616321 B2 JP H0616321B2 JP 17450186 A JP17450186 A JP 17450186A JP 17450186 A JP17450186 A JP 17450186A JP H0616321 B2 JPH0616321 B2 JP H0616321B2
- Authority
- JP
- Japan
- Prior art keywords
- medium
- temperature coefficient
- recording
- magnetic recording
- head
- 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.)
- Expired - Lifetime
Links
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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
Landscapes
- Digital Magnetic Recording (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、フレキシブルディスクやハードディスクな
ど、オーバーライトにより書き換えを行う磁気記録装置
に関するものである。Description: TECHNICAL FIELD The present invention relates to a magnetic recording device such as a flexible disk or a hard disk that is rewritten by overwriting.
(従来の技術) 第３図は従来のオーバーライトの概念図である。媒体１
に記録されている信号６の上に、広めのギャップ長のヘ
ッド２により新しい信号４を重ね書き(オーバーライト)
することによって、同時に前の信号を消去するものであ
る。(Prior Art) FIG. 3 is a conceptual diagram of a conventional overwrite. Medium 1
The new signal 4 is overwritten on the signal 6 recorded on the head by the head 2 with a wider gap length (overwrite).
By doing so, the previous signal is erased at the same time.
温度等の変化により記録領域3の大きさが多少変って
も、媒体の底まで達しているので、十分なオーバーライ
トが得られる。Even if the size of the recording area 3 slightly changes due to a change in temperature or the like, since it reaches the bottom of the medium, sufficient overwrite can be obtained.
(発明が解決しようとする問題点) 以上述べたオーバーライトは、記録密度が低い、すなわ
ち、ヘッドのギャップ長が広く媒体の底まで十分に飽和
記録できるような装置では、問題なく機能した。(Problems to be Solved by the Invention) The above-described overwrite worked without problems in an apparatus having a low recording density, that is, a head having a wide gap length and capable of sufficiently performing saturated recording up to the bottom of the medium.
最近、高記録密度化とともに、より狭ギャップのヘッド
が使われるようなって来つつあり、それに対し、媒体の
塗布層の厚みは0.5μｍ位が限界と言われそれ以下を均
一に塗るとこは難しくなってきている。したがって、狭
ギャップヘッドで記録した場合表層記録にならざるを得
ない。Recently, with the increase in recording density, heads with narrower gaps are being used. On the other hand, it is said that the thickness of the coating layer of the medium is about 0.5 μm, and it is difficult to apply less than that. It has become to. Therefore, when recording with a narrow gap head, surface recording is inevitable.
このときに問題となるのはオーバーライト性能の確保で
ある。媒体の抗磁力をある程度小さくしておけば、表層
記録でも−28dB程度のオーバーライト性能は確保できる
（第１図）が媒体の抗磁力やヘッドの飽和磁束密度が温
度により変化すると、第2図のように記録深さが変化
し、消し残りの信号5のためオーバーライト性能の劣化
まねく。The problem at this time is to secure the overwrite performance. If the coercive force of the medium is made small to some extent, an overwrite performance of about -28 dB can be secured even in surface recording (Fig. 1). However, if the coercive force of the medium and the saturation magnetic flux density of the head change with temperature, The recording depth changes as shown, and the overwrite performance deteriorates due to the remaining unerased signal 5.
本発明の目的は、このような欠点をなくし、使用温度が
変化してもオーバーライトが劣化することのない磁気記
録装置を提供することにある。An object of the present invention is to eliminate such drawbacks and provide a magnetic recording apparatus in which overwriting does not deteriorate even when the operating temperature changes.
(問題点を解決するための手段) 上記目的を達成するために、本発明は、オーバーライト
により書き換えを行う磁気記録装置において、磁気記録
媒体の抗磁力の温度係数と磁気ヘッドの飽和磁束密度の
温度係数との差の絶対値を０．０４％／℃以下にして表
層記録を行うようにしたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a magnetic recording device that performs rewriting by overwriting, in which the temperature coefficient of the coercive force of the magnetic recording medium and the saturation magnetic flux density of the magnetic head are The surface layer recording is performed by setting the absolute value of the difference from the temperature coefficient to 0.04% / ° C. or less.
(作用) 本発明においては、媒体の抗磁力の温度係数とヘッドの
飽和磁束密度の温度係数が等しくしてあるので、周囲温
度が変っても記録深さは変化せず、オーバーライトの劣
化が極めて少くなる。(Function) In the present invention, since the temperature coefficient of the coercive force of the medium and the temperature coefficient of the saturation magnetic flux density of the head are made equal, the recording depth does not change even if the ambient temperature changes, and the deterioration of overwriting does not occur. Very few.
(実施例) 以下本発明の実施例および参考例を示す。(Examples) Examples and reference examples of the present invention will be shown below.
媒体としては、CoCrスパッタ膜を有するスパッタ媒体
と、メタル、又は、Co-YFe2O3の粒子を分散塗布した塗
布媒体を用い、ヘッドとしてはフェライト２種類とセン
ダストを用いた。The medium employed and the sputtering medium having a CoCr sputtered film, metal, or, using a coating medium dispersion coating the particles of Co -Y Fe 2 O 3, ferrite two and Sendust as the head.
第1表は、各組み合わせで測定した25℃でのオーバーラ
イト性能(Ｏ/Ｗ25)、10℃で書き込み50℃で重ね書きし
たときのオーバーライト性能(Ｏ/Ｗ10-50)、50℃で書き
込み10℃で重ね書きしたときのオーバーライト性能(Ｏ/
Ｗ50-10)を媒体の抗磁力並びにヘッドの飽和磁束密度の
温度係数とともにまとめたものである。温度係数の差
(媒体の抗磁力の温度係数からヘッドの飽和磁束密度の
温度係数を引いたもの)が、正の組み合わせではその値
にしたがって、温度を上げたときのオーバーライト性能
(Ｏ/Ｗ10-50)が劣化している。一方、温度係数の差が負
のものでは、温度を下げたときのオーバーライト性能
(Ｏ/Ｗ50-10)が劣化している。Table 1 shows the overwrite performance at 25 ° C (O / W 25 ) measured at each combination, overwriting performance at 10 ° C, overwriting performance at 50 ° C (O / W 10-50 ), 50 ° C. Overwrite performance (O /
W 50-10 ) together with the coercive force of the medium and the temperature coefficient of the saturation magnetic flux density of the head. Temperature coefficient difference
(The temperature coefficient of the coercive force of the medium minus the temperature coefficient of the saturation magnetic flux density of the head) is a positive combination, and the overwrite performance when the temperature is raised according to that value.
(O / W 10-50 ) is deteriorated. On the other hand, when the difference in temperature coefficient is negative, overwrite performance when the temperature is lowered
(O / W 50-10 ) is deteriorated.
実施例では、この温度係数の差の絶対値を0.04%/℃以下
に抑えてあるので、温度を変化させたときのオーバーラ
イト性能の劣化も3dB程度に収まっている。しかしなが
ら、温度係数を合わせていない参考例では、25℃でのオ
ーバーライト性能(Ｏ/Ｗ25)が−28dB以下になっていて
も、温度変化によってオーバーライト性能の値が大きく
変化している。In the example, the absolute value of the difference in temperature coefficient is suppressed to 0.04% / ° C. or less, so that the deterioration of the overwrite performance when the temperature is changed is within about 3 dB. However, in the reference example in which the temperature coefficient is not adjusted, even if the overwrite performance (O / W 25 ) at 25 ° C. is −28 dB or less, the value of the overwrite performance greatly changes due to the temperature change.
たとえば、参考例４のＣｏ−γＦｅ２Ｏ３媒体とセンダ
ストヘッドの組み合わせでは、25℃で−３０．６dBあっ
たオーバーライト性能が40℃の温度上昇で−24.2dBまで
劣化している。また、参考例３では温度係数の差は0.07
%/℃なのであるが、オーバーライト性能の劣化は4dBを
越え、40℃の温度変化に対して−28dBのオーバーライト
性能を確保できない。したがって、温度係数の差は0.04
%/℃以下に迎えるべきである。 For example, in the combination of the Co-γFe 2 O 3 medium of Reference Example 4 and the sendust head, the overwrite performance, which was -30.6 dB at 25 ° C, deteriorates to -24.2 dB at a temperature increase of 40 ° C. In Reference Example 3, the temperature coefficient difference is 0.07.
Although it is% / ° C, the deterioration of the overwrite performance exceeds 4 dB, and it is not possible to secure the overwrite performance of -28 dB against the temperature change of 40 ° C. Therefore, the temperature coefficient difference is 0.04
It should reach below% / ℃.
(発明の効果) 以上のように本発明の磁気記録装置では、たとえ表面記
録であったとしても、周囲温度の変化によるオーバーラ
イト性能の劣化をきわめで少く抑えることができる。(Effects of the Invention) As described above, in the magnetic recording apparatus of the present invention, even in the case of surface recording, deterioration of the overwrite performance due to a change in ambient temperature can be suppressed to a small extent.
第１図は本発明を実施したときの概念図である。第２図
は従来のままヘッドを狭ギャップ化したときの概念図で
ある。第３図は従来のオーバーライトの概念図である。 図において、 １……媒体の記録層、２……ヘッド、 ３……記録領域、４……新しい信号、 ５……消し残りの信号、 ６……すでに記録されている信号FIG. 1 is a conceptual diagram when the present invention is implemented. FIG. 2 is a conceptual view when the head has a narrow gap as it is. FIG. 3 is a conceptual diagram of conventional overwrite. In the figure, 1 ... recording layer of medium, 2 ... head, 3 ... recording area, 4 ... new signal, 5 ... remaining unerased signal, 6 ... already recorded signal
Claims (1)
記録装置において、磁気記録媒体の抗磁力の温度係数と
磁気ヘッドの飽和磁束密度の温度係数との差の絶対値を
０．０４％／℃以下にして表層記録を行うようにしたこ
とを特徴とする磁気記録装置。1. In a magnetic recording apparatus for rewriting by overwriting, the absolute value of the difference between the temperature coefficient of coercive force of a magnetic recording medium and the temperature coefficient of saturation magnetic flux density of a magnetic head is set to 0.04% / ° C. or less. A magnetic recording device characterized by performing surface recording.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17450186A JPH0616321B2 (en) | 1986-07-23 | 1986-07-23 | Magnetic recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17450186A JPH0616321B2 (en) | 1986-07-23 | 1986-07-23 | Magnetic recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6331001A JPS6331001A (en) | 1988-02-09 |
| JPH0616321B2 true JPH0616321B2 (en) | 1994-03-02 |
Family
ID=15979603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17450186A Expired - Lifetime JPH0616321B2 (en) | 1986-07-23 | 1986-07-23 | Magnetic recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616321B2 (en) |
-
1986
- 1986-07-23 JP JP17450186A patent/JPH0616321B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6331001A (en) | 1988-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0823925B2 (en) | Magnetic recording / reproducing device | |
| JP2990885B2 (en) | Thin-film magnetic head and magnetic disk drive using the same | |
| JPH0616321B2 (en) | Magnetic recording device | |
| Nakamura et al. | Perpendicular read/Write performance of ferrite heads on vacuum-deposited CoCr single-layer media | |
| JP2516955B2 (en) | Magnetic recording device | |
| EP0917130A3 (en) | Apparatus for recording data on magnetic record medium | |
| JPH0619803B2 (en) | Magnetic recording device | |
| JPS5868234A (en) | Composite magnetic recording medium | |
| JP2523467B2 (en) | Perpendicular magnetic recording media | |
| JPS6139226A (en) | Magnetic recording medium | |
| WO1986003324A1 (en) | Optimum control of overwrite by record gap length selection | |
| JP3081229B2 (en) | MIG type magnetic head | |
| JPS6381617A (en) | Single magnetic pole type magnetic head for perpendicular recording | |
| JPH0633534Y2 (en) | Magnetic card | |
| JPS61160811A (en) | Magnetic head for floppy disk | |
| JPS60202510A (en) | Magnetic head | |
| JPS6371907A (en) | Erasing head | |
| JPS61294620A (en) | Magnetic head | |
| JPH09305951A (en) | Magnetic recording medium and magnetic recording method | |
| JPH06162419A (en) | Magnetic recording method | |
| JPS5857806B2 (en) | magnetic recording method | |
| JPS63161506A (en) | Magnetic recording method | |
| JPS6398802A (en) | Method and device for magnetic recording and reproduction | |
| JPH0827885B2 (en) | Method for determining proper write current for magnetic head | |
| JPH02110807A (en) | Magnetic head and magnetic recording method |