KR940009169B1 - Magnetic head structure and menufacturing method thereof - Google Patents

Magnetic head structure and menufacturing method thereof Download PDF

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KR940009169B1
KR940009169B1 KR1019920005070A KR920005070A KR940009169B1 KR 940009169 B1 KR940009169 B1 KR 940009169B1 KR 1019920005070 A KR1019920005070 A KR 1019920005070A KR 920005070 A KR920005070 A KR 920005070A KR 940009169 B1 KR940009169 B1 KR 940009169B1
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glass
soft magnetic
magnetic head
magnetic film
track
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KR1019920005070A
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KR930020363A (en
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윤종근
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주식회사 금성사
이헌조
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Abstract

processing a wire wound groove (2), a track groove (3) on a single crystal ferrite core, molding melted glass to move to the wire wound groove and the track groove, growing the soft magnetic layer (5), deleting some part of the glass (4) and the soft magnetic layer of the track groove, joining the core, and cutting.

Description

자기헤드 구조 및 그 제조방법Magnetic Head Structure and Manufacturing Method Thereof

제1도는 종래의 자기헤드 제조공정도.1 is a conventional magnetic head manufacturing process diagram.

제2도는 종래의 다른 자기헤드 구조의 단면도.2 is a cross-sectional view of another conventional magnetic head structure.

제3도는 본 발명의 자기헤드 제조공정도.3 is a magnetic head manufacturing process diagram of the present invention.

제4도는 본발명인 자기헤드 구조의 확대단면도.4 is an enlarged cross-sectional view of the magnetic head structure of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 단결정 페라이트(IC 코어) 2 : 권선홈1: Single Crystal Ferrite (IC Core) 2: Winding Groove

3 : 트랙홈 4 : 글라스(Glass)3: track groove 4: glass

5 : 연자성막 6 : 갭5: soft magnetic film 6: gap

7 : 접동면 8 : 운모7: sliding surface 8: mica

9 : 경사치구 10 : 절단휠9: inclined jig 10: cutting wheel

11 : 트랙대향면 12 : 헤드하부11: track facing surface 12: lower head

13 : 글라스-페라이트 계면13: glass-ferrite interface

본 발명은 자기헤드에 관한 것으로, 특히 글라스 성막시 기포발생을 적게하고 글라스와 페라이트 계면에 있는 연자성막을 제거함과 함께 트랙에만 연자성막을 성막하고 또한 트랙폭을 짧게 함으로서 자속누축을 최소화하는데 적함한 자기헤드 및 그 제조방법에 관한 것이다. 자기 기록 분야에서는 정보신호의 고밀도화 추세에 따라 신호 주파수 대역이 커질뿐만아니라 기록 매체의 보자력도 증가하고 있다. 이에 따라 자기 헤드는 항자력이 큰 매체를 자화시키기 위하여 헤드로 부터의 누설자속 즉 자기 유도가 큰 것이 요구된다.The present invention relates to a magnetic head, and in particular, it is suitable for minimizing magnetic flux accumulation by reducing the occurrence of bubbles during glass deposition, removing the soft magnetic film at the glass and ferrite interface, and forming a soft magnetic film only on the track and shortening the track width. A magnetic head and a method of manufacturing the same. In the field of magnetic recording, as the density of information signals increases, not only the signal frequency band is increased but also the coercive force of the recording medium is increasing. Accordingly, the magnetic head is required to have a large leakage flux from the head, that is, magnetic induction, in order to magnetize a medium having high coercive force.

따라서 헤드캡 양쪽에 과포화 자화값을 갖는 연자성 물질인 센더스트(sendust)(Fe-Al-Si 합금), 퍼마로이(Permalloy), 소프맥스(Sofmax)(Fe-Si-Ga-Ru 합금)등의 합금들 박막 형태로 성막하여 두개의 코어를 접합하여 자기 기록 매체에 이용하고 있다. 이러한 타입의 헤드를 MIG(Metal-In-GaP)헤드라 한다.Therefore, soft magnetic materials having supersaturated magnetization values on both sides of the head cap, such as senddust (Fe-Al-Si alloy), Permalloy, Sofmax (Fe-Si-Ga-Ru alloy), etc. Alloys were formed into a thin film to bond two cores together and used for a magnetic recording medium. This type of head is called a MIG (Metal-In-GaP) head.

통상, MIG형 자기헤드는 제1도와 같은 제조공정으로 이루어지는데, 단결정 페라이트(1) 코어(C-코어)와 I-코어로 되어 있으나 편의상 하나의 코어만을 설명함)에 권선홈(2)과 트랙폭(TW′)을 갖는 트랙홈(3)을 가공하고 (a도와 b도공정), 권선홈(2)과 트랙대향면(11)에 봉상 및 각형 글라스(Glass)(4)를 올려놓고(c도공정) 500-800℃에서 글라스(4)를 녹여 권선홈(2)과 트랙홈(3)에 글라스를 채운후(d도공정), 연마하고 권선홈의 과잉 글라스를 수정 제거한다(e도와 f도공정). 이어서 센더스트등의 연자성막(5)을 성막한후(g도공정) 두개의 코어(C-코어, I-코어)를 일치시켜 500-800℃에서 고온 본딩하고(h도공정) 절단하여 최종적인 접동면(7)을 갖는 단위편의 자기헤드를 얻게 된다(i도공정)In general, the MIG magnetic head is composed of a manufacturing process as shown in FIG. 1, which comprises a single crystal ferrite core (C-core) and an I-core, but only one core is described for convenience). The track groove 3 having the track width TW 'is machined (process a and b), and the rod-shaped groove and the glass 4 are placed on the winding groove 2 and the track facing surface 11. (C degree process) Melt the glass 4 at 500-800 degreeC, fill the glass in the winding groove 2 and the track groove 3 (d degree process), and polish and remove excess glass of a winding groove ( e and f degrees process). Subsequently, after forming the soft magnetic film 5 such as sender (g degree process), the two cores (C-core, I-core) are matched and bonded at high temperature at 500-800 ° C. (h degree process), and then cut. The magnetic head of the unit piece with the sliding surface 7 is obtained (i degree process).

또한 다른 공정의 하나는 상기의 (c도)와 (d도)공정처럼 글라스 몰딩을 거치지 않고 권선홈과 트랙홈에 직접 제2도와 같이 연자성막(5)을 성막한후 코어를 일치시켜 권선홈에 글라스를 넣어 접합시켜 접동면 형상을 갖는 자기헤드를 얻기도 한다. 그러나 상기한 제1도 제조방법은, (c도)공정처럼 올려놓은 글라스(4)가 녹을 때 이것이 권선홈(2)과 트랙홈(3)에 충분히 채워지지 않고 용융되는 500-800℃에서 분위기 가스인 질소(N₂)가 혼입되어 기포가 발생하거나, (f도)공정처럼 과잉 글라스 제거후 (g도)공정처럼 성막된 연자성막(5)은 트랙홈에만 존재하는 것이 아니라 두개의 코어를 지지하는 글라스(4)내에도 존재하므로 비록 3-10㎛의 얇은 연자성막(5)이지만 이 막때문에 글라스 접합시 기포 발생의 원인이 되고, 기록 재생시 테이프 자성분말이 기포에 혼입되어 노이즈(Noise)의 원인이 되는 문제점이 있다.In addition, one of the other processes is performed by forming the soft magnetic film 5 directly on the winding grooves and the track grooves as shown in FIG. Glass may be inserted into and bonded to obtain a magnetic head having a sliding surface shape. However, the first manufacturing method described above is an atmosphere at 500-800 ° C., in which the glass 4 placed on it is melted without being sufficiently filled in the winding grooves 2 and the track grooves 3, as in step (c). The gas is mixed with nitrogen (N₂) to generate bubbles, or the soft magnetic film (5) formed as in the (g) process after removing the excess glass as in the (f) process does not exist only in the track groove but supports two cores. Although it is also present in the glass 4, although it is a thin soft magnetic film 5 having a thickness of 3-10 mu m, this film causes bubbles during glass bonding, and the tape magnetic powder is mixed into the bubbles during recording and reproducing. There is a problem that causes.

또한 제2도와 같은 경우는 연자성막(5)이 페라이트(1)와 글라스(4) 접촉면에 있으므로 기포발생의 원인은 제거될 수 있지만 자속은 기록과 재생시 트랙폭(TW′)에 해당하는 갭에서 뿐만아니라 페라이트와 글라스(4) 계면에 있는 연자성막(5)에서도 누설되는 문제점이 있다. 이에 본발명은 페라이트와 글라스의 계면에 성막되어 있는 연자성막을 제거하고 짧은 트랙폭에 해당하는 갭에만 연자성막을 성막함으로서 종래의 문제점을 해결하고자 하는데 그 목적이 있다.Also, in the case of FIG. 2, since the soft magnetic film 5 is in contact with the ferrite 1 and the glass 4, the cause of bubble generation can be eliminated, but the magnetic flux is the gap corresponding to the track width (TW ') during recording and playback. In addition, there is a problem in that the soft magnetic film 5 at the interface between the ferrite and the glass 4 leaks. Accordingly, the present invention aims to solve the conventional problems by removing the soft magnetic film formed at the interface between the ferrite and the glass and forming the soft magnetic film only in a gap corresponding to a short track width.

이하 본발명을 설명한다.The present invention will be described below.

본 발명은 단결성 페라이트(1)와 연자성막(5)으로 구성된 복합 자기헤드에 있어서, 트랙폭(TW)인 갭(6)에만 연자성막(5)이 성막된 접동면을 갖게 하여 글라스와 페라이트의 계면(12)에서 누출되는 자속의 영향을 최소화하게 한 자기헤드로 되어진다. 이때 갭(6)에만 연자성막을 형성시킴에 있어서는 글라스와 페라이트계면의 연자성막을 절단 휠(cutting wheel)로서 제거하여 이루어진다.According to the present invention, in the composite magnetic head composed of the unitary ferrite 1 and the soft magnetic film 5, only the gap 6 having the track width TW has a sliding surface on which the soft magnetic film 5 is formed. The magnetic head is made to minimize the influence of the magnetic flux leaking at the interface 12 of the. At this time, in forming the soft magnetic film only in the gap 6, the soft magnetic film of the glass and the ferrite interface is removed as a cutting wheel.

이와같은 본발명은 제3도의 제조공정도에 따라 설명하면, 단결정 페라이트(1)(C-코어,I-코어로 되어 있으나 하나의 코어만을 설명함)에 권선홈(2)과 트랙홈(3)을 가공(a도와 b도공정)한 후, 종래의 (c도)공정과 같이 봉상 또는 각형의 글라스(4)를 트랙대향면(11)에 올려놓지 않고, 권선홈(2)과 헤드하부(12)에 놓고 용융시켜 권선홈(2)과 트랙홈(3)에 글라스가 흘러 채워지게 되는데 (c도)와 (d도)공정, 이때 경사치구(9)를 사용함으로서 용융된 글라스가 트랙홈(3)과 권선홈(2)에 흘러내리게 함과 아울러 과잉 글라스가 트랙대향면(11)에 넘치지 않도록 한다. 또한 치구(9)와 페라이트(1)가 글라스(4)에 의해 붙지 않도록 운모판(8)을 사용함이 바람직하다. 이와같이 하여 글라스가 몰딩된다.The present invention is described according to the manufacturing process diagram of FIG. 3, in which the winding groove 2 and the track groove 3 are formed in the single crystal ferrite 1 (C-core and I-core, but only one core is described). After the process (a degree and b degree process), the winding groove 2 and the head lower part (without putting the rod-shaped or rectangular glass 4 on the track facing surface 11 like a conventional process (c degree)) are carried out. 12) and the glass is flowed into the winding groove (2) and the track groove (3) to be melted in the process (c degrees) and (d degrees) process, the molten glass by using the inclined jig (9) is track groove (3) and the winding groove (2) to flow down and to prevent the excess glass from overflowing to the track facing surface (11). It is also preferable to use the mica plate 8 so that the jig 9 and the ferrite 1 do not stick together by the glass 4. In this way the glass is molded.

이와 같은 상기 (c도)와 (d도)공정을 통한 글라스 몰딩시는 글라스가 서서히 흘러내리므로 질소(N2)같은 분위기 가스가 빠져나가 기포생성을 억제하는 효과도 있다. 채워진 글라스위에 연자성막(5)을 성막한후(e도공정) 글라스(4)위의 연자성막(5)와 글라스의 일부를 제거하기 위해 절단 휠(cutting wheel)(10)로 가공한다(f도공정). 이렇게 휠로 가공함에 따라 당초 트랙폭 TW′(이는 b도공정시 가공했던 트랙폭임)는 연자성막 및 글라스 제거후 TW로 된다.(g도공정). 이때 제거하는 글라스의 양은 원래 (b도)공정에서의 트랙깊이(D)의 1/30-1/5 정도로 하여 트랙에 채우져 있던 글라스가 대부분 남게 된다.When the glass molding through the (c degree) and (d degree) process as described above, the glass is gradually flowed down so that an atmosphere gas such as nitrogen (N 2 ) is released to suppress bubble formation. After forming the soft magnetic film 5 on the filled glass (e-process), the soft magnetic film 5 on the glass 4 and the cutting wheel 10 are removed to remove a portion of the glass (f). Process). As the wheel is processed in this way, the track width TW '(which is the track width that was processed during the b degree process) becomes TW after the soft magnetic film and the glass are removed (g degree process). At this time, the amount of glass removed is about 1 / 30-1 / 5 of the track depth D in the process (b degree), so that most of the glass filled in the track remains.

상기와 같이 제조된 C-코어와 I-코어를 일치시켜 500-800℃에서 글라스 접합하게 되는데(h도공정), 연자성막 제거후 모자라는 글라스를 보충하기 위해 상기 공정에서 권선홈 수정시 남겨두는 권선홈 글라스의 양은 규정보다 많이 남겨두어야 한다. 상기 공정에 의해 본딩한 것을 절단하여 단위편의 헤드코어가 형성된다(i도공정). 제4도는 단위편으로 절단된 접동면 부근의 확대 단면도로서, 이는 제3도의 공정에서 절단휠(10)로 연자성막(5)과 글라스(4)를 제거함에 따라 나타난 형상이다. 이는 절단가공의 정도에 따라 글라스페라이트 계면(13)을 다단으로 할 수 있으며, 이런 이단각은 기록 재생시 자속의 집중 효과도 좋아 더욱 바람직한 성능을 갖는 헤드를 얻게 된다.The C-core manufactured as described above and the I-core are matched to glass bonding at 500-800 ° C. (h degree process), which is left when modifying the winding groove in the process to replenish the insufficient glass after removing the soft magnetic film. The amount of winding groove glass should be left above the limit. By bonding the above-mentioned steps, the head core of the unit piece is formed (i degree process). FIG. 4 is an enlarged cross-sectional view of the sliding surface cut into unit pieces, which is shown by removing the soft magnetic film 5 and the glass 4 with the cutting wheel 10 in the process of FIG. This allows the glass ferrite interface 13 to be multistage in accordance with the degree of cutting, and this two-stage angle also has a better effect of concentrating magnetic flux when recording and reproducing, thereby obtaining a head having more desirable performance.

이상에서와 같이 본발명은 권선홈(2) 및 헤드하부(12)로 부터 서서히 흘러 채워지게 하는 글라스 몰딩을 함으로서 트랙(13) 및 권선홈(2)에서 생기는 기포를 최대한 억제함과 함께 글라스와 페라이트 계면(13)의 연자성막(15)을 제거하여 계면에서 누설되는 자속을 감소하고, 트랙에 있는 갭(6)에만 연자성막(5)이 있고 또한 연자성막(5) 제거시 글라스와 페라이트 계면(13)을 다단각으로 함으로서 갭(6) 부근에 자속이 집중되어 고성능을 갖는 자기헤드를 얻게 된다.As described above, the present invention provides a glass molding that gradually flows from the winding groove 2 and the lower head 12 to be filled with the glass and minimizes bubbles generated in the track 13 and the winding groove 2. The soft magnetic film 15 of the ferrite interface 13 is removed to reduce the magnetic flux leaking from the interface, and only the gap 6 in the track has the soft magnetic film 5 and also the glass and ferrite interface when the soft magnetic film 5 is removed. By making (13) the multi-stage angle, the magnetic flux is concentrated in the vicinity of the gap 6, and a magnetic head having high performance is obtained.

Claims (3)

단결정 페라이트 양쪽에 연자성막을 성막한 MIG(Metal-In-GaP)형 자기헤드에 있어서, 페라이트와 글라스 계면(13)에 있는 연자성막을 제거하여 트랙폭(TW)인 갭(6)에만 연자성막(5)을 성막한 접동면(7)을 갖게함을 특징으로 하는 자기헤드 구조.In the MIG (Metal-In-GaP) type magnetic head in which a soft magnetic film is formed on both sides of a single crystal ferrite, the soft magnetic film is removed only in the gap 6 having a track width (TW) by removing the soft magnetic film at the ferrite and glass interface 13. A magnetic head structure characterized by having a sliding surface (7) formed by depositing (5). 제1항에 있어서, 글라스와 페라이트 계면(13)을 다단으로 하는 자기헤드 구조.2. The magnetic head structure according to claim 1, wherein the glass and ferrite interfaces (13) are multistage. 단결정 페라이트 코어에 권선홈(2), 트랙홈(3)을 가공하여 용융 글라스가 트랙홈(3)과 권선홈(2)에 흘러내리게 몰딩하고, 연자성막(5)을 성막한후, 트랙홈(3)의 연자성막(5)과 글라스(4)의 일부를 제거하고, 코어를 접합시킨 후, 절단하여 자기헤드편을 얻는 것을 특징으로 하는 자기헤드 제조방법.Winding grooves 2 and track grooves 3 are processed in the single crystal ferrite core so that molten glass flows down into the track grooves 3 and the winding grooves 2, and the soft magnetic film 5 is formed. A method of manufacturing a magnetic head, comprising removing a portion of the soft magnetic film (5) and a portion of the glass (4), bonding the cores, and then cutting the magnetic head piece.
KR1019920005070A 1992-03-27 1992-03-27 Magnetic head structure and menufacturing method thereof KR940009169B1 (en)

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