JPH0376526B2 - - Google Patents
Info
- Publication number
- JPH0376526B2 JPH0376526B2 JP58020602A JP2060283A JPH0376526B2 JP H0376526 B2 JPH0376526 B2 JP H0376526B2 JP 58020602 A JP58020602 A JP 58020602A JP 2060283 A JP2060283 A JP 2060283A JP H0376526 B2 JPH0376526 B2 JP H0376526B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- gap
- glass
- sio
- pair
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/23—Gap features
- G11B5/235—Selection of material for gap filler
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は磁気記録再生装置に用いる磁気ヘツド
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 head used in a magnetic recording/reproducing device.
従来例の構成とその問題点
フエライトヘツドなどでは、ギヤツプ材料とし
てガラスが用いられ、耐摩耗性、硬度の関係より
高融点ガラスまたはSiO2が主であつた。コア材
にアモルフアス磁性合金を用いると、材料の結晶
化温度という制約のため、せいぜい500℃が耐熱
限界である。そのため、ギヤツプをガラス接着す
る時、500℃以上に加熱することができず、その
ためギヤツプスペーサが融合せず、強固なギヤツ
プを形成することができなかつた。Construction of conventional examples and their problems In ferrite heads and the like, glass is used as the gap material, and high melting point glass or SiO 2 has been the main material due to its wear resistance and hardness. When an amorphous magnetic alloy is used as the core material, the heat resistance limit is at most 500°C due to the crystallization temperature of the material. Therefore, when bonding the gap to the glass, it was not possible to heat it above 500°C, and as a result, the gap spacers did not fuse, making it impossible to form a strong gap.
発明の目的
本発明は低温でガラスによるギヤツプ形成を行
なつた時でも強固な磁気ギヤツプを得ることので
きる磁気ヘツドを提供することを目的とする。OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic head that can obtain a strong magnetic gap even when forming a gap with glass at low temperatures.
発明の構成
上記の目的を達成するため本発明の磁気ヘツド
は、補強材の間にアモルフアス磁性合金が固着さ
れた一対の磁気コアと、その一対の磁気コアの間
に設けられる磁気ギヤツプが重量百分率でPbOが
70％を超え、残部が少なくともSiO2、Al2O3、
B2O3の鉛ガラスからなる中間層と上記磁気コア
との接合面がSiO2層とからなり、上記一対の磁
気コアが接合用ガラスで接合された構成とする。Structure of the Invention In order to achieve the above object, the magnetic head of the present invention includes a pair of magnetic cores in which an amorphous magnetic alloy is fixed between reinforcing materials, and a magnetic gap provided between the pair of magnetic cores. So PbO
more than 70%, the balance being at least SiO 2 , Al 2 O 3 ,
The bonding surface between the intermediate layer made of B 2 O 3 lead glass and the magnetic core is made of a SiO 2 layer, and the pair of magnetic cores are bonded by a bonding glass.
実施例の説明
以下、本発明の実施例について、図面を用いて
説明する。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図に示すように、アモルフアス磁性合金１
を補強材２，３で固着された構造の磁気コアを作
製し、巻線溝加工を行なつた後、磁気ギヤツプ面
４を平坦に研摩する。この磁気ギヤツプ面４にギ
ヤツプ長に相当するギヤツプスペーサを形成す
る。第２図に示すように、まずSiO2層５をRFス
パツタ法により1000〓厚に形成し、その上に中間
層となる鉛ガラス層６を同じくRFスパツタ法に
より250〓厚に形成する。鉛ガラスとしては
PbO84wt％、B2O310wt％、SiO23wt％、および
Al2O33wt％の組成比率のガラスを用いた。この
ガラスの軟化点は370℃である。次に第３図に示
すように、ギヤツプスペーサを形成した磁気コア
を左右突き合せ、低融点の接合用ガラス棒７を配
置し、加熱することにより、左右の磁気コアを接
合させた。この時の温度は470℃である。この接
合時に470℃の状態でのギヤツプスペーサの鉛ガ
ラスの粘度は、104ポイズ程度であり、完成した
磁気ギヤツプは確実に接合されていて、気泡など
も認められなかつた。そのギヤツプ長は0.25μｍ
である。 As shown in Fig. 1, amorphous magnetic alloy 1
A magnetic core having a structure in which the magnetic cores are fixed with reinforcing materials 2 and 3 is prepared, and after winding grooves are formed, the magnetic gap surface 4 is polished flat. A gap spacer corresponding to the gap length is formed on this magnetic gap surface 4. As shown in FIG. 2, first, a SiO 2 layer 5 is formed to a thickness of 1000 mm using the RF sputtering method, and a lead glass layer 6 serving as an intermediate layer is formed thereon to a thickness of 250 mm using the RF sputtering method. As lead glass
PbO84wt%, B2O3 10wt % , SiO2 3wt%, and
Glass with a composition ratio of Al 2 O 3 3wt% was used. The softening point of this glass is 370°C. Next, as shown in FIG. 3, the left and right magnetic cores formed with gear spacers were butted against each other, and a low melting point glass rod 7 for bonding was placed and heated to bond the left and right magnetic cores. The temperature at this time is 470°C. The viscosity of the lead glass of the gap spacer at 470°C during this bonding was approximately 10 4 poise, and the completed magnetic gap was securely bonded with no air bubbles. Its gap length is 0.25μm
It is.
次に、中間層となる鉛ガラスの成分を種々変化
させ、そのギヤツプ形成の良否を判定したとこ
ろ、PbOの量を90wt％にすると、ガラスとして
不安定となり、失透しやすい。しかも形成された
磁気ギヤツプ長は第４図に示すように鉛ガラスの
厚さが不安定であり、極端な場合にはSiO2をも
侵食し、ギヤツプ長がほぼ０に等しい箇所も見ら
れた。またPbOの量を70wt％以下にすると、形
成ギヤツプ長は正確であるが、ギヤツプスペーサ
の融合は見られず、磁気コアより単体チツプに切
断した時に破損した。これはギヤツプ接合面での
強度が不十分であつたためである。 Next, we varied the components of the lead glass that forms the intermediate layer to determine the quality of gap formation.We found that when the amount of PbO was 90 wt%, the glass became unstable and was prone to devitrification. Furthermore, as shown in Figure 4, the magnetic gap length formed was unstable due to the thickness of the lead glass, and in extreme cases it even eroded the SiO 2 , and there were places where the gap length was almost equal to 0. . When the amount of PbO was 70wt% or less, the formed gap length was accurate, but no fusion of the gap spacers was observed, and the chips were broken when cut into single chips from the magnetic core. This is because the strength at the gap joint surface was insufficient.
上記のデータは左右の磁気コアの接合温度を
470℃で30分間保持した時の結果である。この470
℃は用いたアモルフアス磁性合金の結晶化温度が
520℃であつたため、この合金の再結晶が起きな
い温度として470℃を用いた。一般に鉛ガラスの
PbO含有量を増すと軟化点は低下し、接合温度に
おけるガラス粘度は下がる。ギヤツプ接合におけ
るガラスの粘度の適否がより強固な磁気ギヤツプ
形成の成否にかかわり、500℃以下の接合では、
ガラス成分としてPbOを70wt％を超えて含有す
るものが非常に有効である。しかし、中間層が鉛
ガラスだけで形成されているものは強度の点で問
題があり、テープ摺動時にギヤツプの偏摩耗を発
生し、ひいてはギヤツプエツジの崩れをひき起
し、強固なギヤツプを形成することは不可能であ
つた。そのため実施例で説明したように、磁気コ
ア面はまずSiO2層を形成し、そのSiO2層の上に
鉛ガラスを用いることにより500℃以下で強固な
磁気ギヤツプを形成することができた。 The above data indicates the junction temperature of the left and right magnetic cores.
These are the results when held at 470°C for 30 minutes. This 470
℃ is the crystallization temperature of the amorphous magnetic alloy used.
Since the temperature was 520°C, 470°C was used as the temperature at which recrystallization of this alloy did not occur. Generally made of lead glass
Increasing the PbO content lowers the softening point and lowers the glass viscosity at the bonding temperature. The suitability of the viscosity of the glass in gap bonding is related to the success or failure of forming a stronger magnetic gap.
Glasses containing more than 70 wt% of PbO are very effective. However, those in which the intermediate layer is made only of lead glass have problems in terms of strength, causing uneven wear of the gap when the tape slides, which in turn causes the gap edge to collapse, forming a strong gap. That was impossible. Therefore, as explained in the examples, by first forming a SiO 2 layer on the magnetic core surface and using lead glass on the SiO 2 layer, a strong magnetic gap could be formed at 500° C. or lower.
発明の効果
本発明の磁気ヘツドによれば、補強材の間にア
モルフアス磁性合金が固着された一対の磁気コア
と、その一対の磁気コアの間に設けられる磁気ギ
ヤツプをSiO2層と70wt％を超えるPbOを含む鉛
ガラスからなる中間層で形成し、接合用ガラスを
用いて加熱処理することにより十分強固な耐久性
のある磁気ヘツドを得ることができる。Effects of the Invention According to the magnetic head of the present invention, a pair of magnetic cores in which an amorphous magnetic alloy is fixed between reinforcing materials, and a magnetic gap provided between the pair of magnetic cores are made of a SiO2 layer and a 70wt% A sufficiently strong and durable magnetic head can be obtained by forming an intermediate layer made of lead glass containing more than 100% PbO and heat-treating it using bonding glass.
第１図は本発明の一実施例の磁気ヘツドに用い
た磁気コアの一部斜視図、第２図は同じく磁気コ
アの一部側面図、第３図は磁気ヘツドの一部側面
図、第４図は鉛ガラスのPbO含有率に対するギヤ
ツプ長と接合状態を示す図である。
１……アモルフアス磁性合金、２，３……補強
材、５……SiO2層、６……中間層。
FIG. 1 is a partial perspective view of a magnetic core used in a magnetic head according to an embodiment of the present invention, FIG. 2 is a partial side view of the magnetic core, and FIG. 3 is a partial side view of the magnetic head. Figure 4 is a diagram showing the gap length and bonding state with respect to the PbO content of lead glass. 1... Amorphous magnetic alloy, 2, 3... Reinforcement material, 5... SiO 2 layer, 6... Intermediate layer.
Claims (1)
れた一対の磁気コアと、その一対の磁気コアの間
に設けられる磁気ギヤツプが重量百分率でPbOが
70％を超え、残部が少なくともSiO2、Al2O3、
B2O3の鉛ガラスからなる中間層と上記磁気コア
との接合面がSiO2層とからなり、上記一対の磁
気コアが接合用ガラスで接合された磁気ヘツド。1 A pair of magnetic cores with an amorphous magnetic alloy fixed between reinforcing materials, and a magnetic gap provided between the pair of magnetic cores have a weight percentage of PbO.
more than 70%, the balance being at least SiO 2 , Al 2 O 3 ,
A magnetic head in which the bonding surface between the intermediate layer made of B 2 O 3 lead glass and the magnetic core is made of a SiO 2 layer, and the pair of magnetic cores are bonded with a bonding glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58020602A JPS59146431A (en) | 1983-02-10 | 1983-02-10 | magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58020602A JPS59146431A (en) | 1983-02-10 | 1983-02-10 | magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59146431A JPS59146431A (en) | 1984-08-22 |
| JPH0376526B2 true JPH0376526B2 (en) | 1991-12-05 |
Family
ID=12031810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58020602A Granted JPS59146431A (en) | 1983-02-10 | 1983-02-10 | magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59146431A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6242308A (en) * | 1985-08-20 | 1987-02-24 | Sanyo Electric Co Ltd | Production of magnetic head |
| JPS6288109A (en) * | 1985-10-14 | 1987-04-22 | Hitachi Ltd | Amorphous magnetic alloy magnetic head and its manufacturing method |
| JPH06309620A (en) * | 1993-04-27 | 1994-11-04 | Matsushita Electric Ind Co Ltd | Magnetic head |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215126B2 (en) * | 1973-05-18 | 1977-04-27 | ||
| JPS55125526A (en) * | 1979-03-22 | 1980-09-27 | Pioneer Electronic Corp | Magnetic head |
| JPS5654622A (en) * | 1979-10-12 | 1981-05-14 | Hitachi Ltd | Magnetic head and its manufacture |
-
1983
- 1983-02-10 JP JP58020602A patent/JPS59146431A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59146431A (en) | 1984-08-22 |
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