JPS6331001A - Magnetic recording device - Google Patents

Magnetic recording device

Info

Publication number
JPS6331001A
JPS6331001A JP17450186A JP17450186A JPS6331001A JP S6331001 A JPS6331001 A JP S6331001A JP 17450186 A JP17450186 A JP 17450186A JP 17450186 A JP17450186 A JP 17450186A JP S6331001 A JPS6331001 A JP S6331001A
Authority
JP
Japan
Prior art keywords
temperature coefficient
temperature
medium
coercive force
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.)
Granted
Application number
JP17450186A
Other languages
Japanese (ja)
Other versions
JPH0616321B2 (en
Inventor
Takayuki Takeda
武田　隆幸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP17450186A priority Critical patent/JPH0616321B2/en
Publication of JPS6331001A publication Critical patent/JPS6331001A/en
Publication of JPH0616321B2 publication Critical patent/JPH0616321B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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)

Abstract

PURPOSE:To prevent the deterioration of an overwriting even when a working temperature is changed by specializing the absolute value of the difference between the temperature coefficient of the coercive force of magnetic recording medium and the temperature coefficient of the saturated magnetic flux density of a magnetic head. CONSTITUTION:The absolute value of the difference between the temperature coefficient of the coercive force of medium and the temperature coefficient of the saturated magnetic flux density of a head is regulated to <=0.04%1 deg.C. Since the temperature coefficient of the coercive force of the medium and the temperature coefficient of the saturated magnetic flux density are equal, even when the ambient temperature is changed, the recording depth is not changed, the deterioration of the overwriting is minimized, and as if the surface recording is obtained, the deterioration of the overwriting performance due to the change of the ambient temperature can be suppressed to a very small extent.

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
、オーバーライド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。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording device, such as a flexible disk or a hard disk, which performs rewriting by overwriting.

（従来の技術） 第３図は従来のオーバーライドの概念図である。(Conventional technology) FIG. 3 is a conceptual diagram of a conventional override.

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
ライド）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。By overwriting a new signal 4 on top of the signal 6 recorded on the medium 1 using the head 2 with a wider gap length, the previous signal is simultaneously erased.

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ド
が得られる。Even if the size of the recording area 3 changes somewhat due to changes in temperature, etc., sufficient override can be obtained because it reaches the bottom of the medium.

（発明が解決しようとする間組点） 以上述べたオーバーライドは、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、開門なく機能した。(Interset Points to be Solved by the Invention) The above-mentioned override functioned without any problem in an apparatus with a low recording density, that is, in which the gap length of the head is wide and saturation recording can be performed sufficiently 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０．５ｐｍ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、
狭ギヤツ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, the thickness of the media coating layer is said to be limited to about 0.5 pm, and it is difficult to uniformly coat anything less than that. It's getting difficult. therefore,
If you record with a narrow gap head, it will be a surface record.

このときに問題となるのはオーバーライド性能の確保で
ある。媒体の抗磁力をある程度小さくしておけば、表層
記録でも一２８ｄＢ程度のオーバーライド性能は確保で
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ド性能の劣
化まねく。The problem at this time is ensuring override performance. If the coercive force of the medium is kept small to a certain extent, override performance of about -28 dB can be ensured even in surface recording (Figure 1), but if the coercive force of the medium and the saturation magnetic flux density of the head change with temperature, the override performance as shown in Figure 2 will change. As the recording depth changes, the override performance deteriorates due to the 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ド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。SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and to provide a magnetic recording device in which the override does not deteriorate even if the operating temperature changes.

（問題点を解決するための手段） 本発明の磁気記憶装置は、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の差の絶対値が０．０４
％／′ｌ′Ｃ以下にしであることを特徴としている。(Means for Solving the Problems) In the magnetic storage device of the present invention, the absolute value of the difference between the temperature coefficient of coercive force of the medium and the temperature coefficient of saturation magnetic flux density of the head is 0.04.
%/'l'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であるので、周囲温
度が変っても記録深さは変化せず、オーバーライドの劣
化が極めて少くなる。(Function) In the present invention, since the temperature coefficient of coercive force of the medium and the temperature coefficient of saturation magnetic flux density of the head are equal, the recording depth does not change even if the ambient temperature changes, and override deterioration is extremely low. It becomes less.

（実施例） 以下本発明の実施例および参考例を示す。(Example) Examples and reference examples of the present invention are 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、Ｂａフェライト又は、Ｃｏ−ｙＦｅ２０
３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 media include a sputtering medium having a CoCr sputtered film, metal, Ba ferrite, or Co-yFe20.
A coating medium in which particles No. 3 were dispersed and coated was used, and two types of ferrite and sendust were used as heads.

第１表は、各組み合わせで測定した２５°Ｃでのオーバ
ーライド性能（０／Ｗ２５）、１０°Ｃで書き込ミ５０
°Ｃで重ね書きしたときのオーバーライド性能 （０／Ｗ１０−５０）、５０°Ｃで書き込み１０°Ｃで
重ね書きしたときのオーバーライド性能（０／Ｗ５Ｑ　
＋　ＩＱ）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ド性能
（○／Ｗｘｏ−５ｏ）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
ド性能（０／Ｗ５Ｑ　−ＩＱ）が劣化している。Table 1 shows the override performance (0/W25) at 25°C measured for each combination and the write mi50 at 10°C.
Override performance when overwriting at °C (0/W10-50), overwriting performance when writing at 50°C and overwriting at 10°C (0/W5Q)
+ IQ) along with the coercive force of the medium and the temperature coefficient of the saturation magnetic flux density of the head. For combinations in which the difference in temperature coefficient (temperature coefficient of coercive force of the medium minus temperature coefficient of saturation magnetic flux density of the head) is positive, the override performance (○/Wxo- 5o) has deteriorated. On the other hand, when the temperature coefficient difference is negative, the override performance (0/W5Q - IQ) is degraded when the temperature is lowered.

実施例では、この温度係数の差の絶対値を０゜０４％／
℃以下に抑えであるので、温度を変化させたときのオー
バーライド性能の劣化も３ｄＢ程度に収まっている。し
かしながら、塩度係数を合わせていない参考例では、２
５°Ｃでのオーバーライド性能（ＯＡＶ２５）が−２８
ｄＢ以下になっていても、温度変化によってオーバーラ
イド性能の値が大きく変化している。In the example, the absolute value of this temperature coefficient difference is 0°04%/
Since the temperature is kept below 0.degree. C., the deterioration in override performance when changing the temperature is also within about 3 dB. However, in the reference example where the salinity coefficients are not matched, 2
Override performance (OAV25) at 5°C is -28
Even if it is below dB, the value of override performance changes greatly due to temperature change.

″−，Ｊｉ’、、： たとえば、参考例８のＢａフェライト媒体とフェライト
２ヘツドの組み合わせでは、２５°Ｃで−２８゜１ｄＢ
あったオーバーライド性能が４０°Ｃの温度上昇で−８
，２ｄＢまで劣化している。また、参考例２や参考例６
では温度係数の差は０．０７％／’Ｃなのであるが、オ
ーバーライド性能の劣化は４ｄＢを越え、４０°Ｃの温
度変化に対して一２８ｄＢのオーバーライド性能を確保
できていない。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。″-, Ji', ,: For example, in the combination of the Ba ferrite medium and the ferrite 2 head of Reference Example 8, -28° 1 dB at 25°C
The override performance was -8 due to a temperature increase of 40°C.
, it has deteriorated to 2 dB. Also, reference example 2 and reference example 6
In this case, the difference in temperature coefficient is 0.07%/'C, but the deterioration in override performance exceeds 4 dB, and override performance of -28 dB cannot be secured against a temperature change of 40°C. Therefore, the difference in temperature coefficient is 0°04%
/℃ or 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
イド性能の劣化をきわめて少く抑えることができる。(Effects of the Invention) As described above, in the magnetic recording device of the present invention, even if surface recording is performed, deterioration in override performance due to changes in ambient temperature can be suppressed to an extremely low level.

【図面の簡単な説明】[Brief explanation of the drawing]

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ドの概念図で
ある。 図において、 １・・・媒体の記録層、　　　２０１．ヘッド、３・・
・記録領域、　　　　　４・・・新しい信号、５・・・
消し残りの信号、 第１図 第２図 第３図FIG. 1 is a conceptual diagram when the present invention is implemented. FIG. 2 is a conceptual diagram of a conventional head with a narrow gap. FIG. 3 is a conceptual diagram of a conventional override. In the figure, 1... Recording layer of medium, 201. Head, 3...
・Recording area, 4...New signal, 5...
Unerased signals, Figure 1, Figure 2, Figure 3

Claims (1)

【特許請求の範囲】[Claims] 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が０．０４％／℃以下
であることを特徴とする磁気記録装置。A magnetic recording device characterized in that 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 0.04%/°C or less.
JP17450186A 1986-07-23 1986-07-23 Magnetic recording device Expired - Lifetime JPH0616321B2 (en)

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 true JPS6331001A (en) 1988-02-09
JPH0616321B2 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)

Also Published As

Publication number Publication date
JPH0616321B2 (en) 1994-03-02

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