KR0136418B1 - Metal in gap type magnetic head - Google Patents
Metal in gap type magnetic headInfo
- Publication number
- KR0136418B1 KR0136418B1 KR1019950001060A KR19950001060A KR0136418B1 KR 0136418 B1 KR0136418 B1 KR 0136418B1 KR 1019950001060 A KR1019950001060 A KR 1019950001060A KR 19950001060 A KR19950001060 A KR 19950001060A KR 0136418 B1 KR0136418 B1 KR 0136418B1
- Authority
- KR
- South Korea
- Prior art keywords
- bar
- track
- gap
- magnetic head
- width
- Prior art date
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Classifications
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- 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
- G11B5/1875—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers
- G11B5/1877—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film
- G11B5/1878—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film disposed immediately adjacent to the transducing gap, e.g. "Metal-In-Gap" structure
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- 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
- G11B5/133—Structure or manufacture of heads, e.g. inductive with cores composed of particles, e.g. with dust cores, with ferrite cores with cores composed of isolated magnetic particles
- G11B5/1335—Assembling or shaping of elements
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
본 발명은 MIG형 자기헤드에서 자기저항을 충분히 작게하여 헤드의 효율을 극대화하고 테이프 접동면이 마모하여 갭깊이가 변화하여도 트랙폭이 변화없는 양호 기록재생 가능한 헤드구조에 관한 것으로, 자기헤드를 구성하는 I-바아(I-bar)와 C-바아(C-bar)중 어느 하나의 bar는 프론트갭(front gap)쪽의 트랙폭과 백갭(back gap)쪽의 트랙폭이 동일하고, 나머지 한 bar는 프론트갭쪽의 트랙이 상기한 프론트갭쪽의 트랙폭과 동일하게 형성되고, 백갭쪽의 트랙폭은 점차적으로 좁게 형성됨을 특징으로 하는 MIG형 자기헤드에 관한 기술임.The present invention relates to a head structure capable of good recording and reproducing without changing the track width even when the gap depth is changed due to wear of the tape sliding surface by maximally reducing the magnetic resistance in the MIG type magnetic head. The bar width of one of the constituent I-bars and C-bars has the same track width at the front gap and the back gap at the same width. One bar is a technology related to the MIG type magnetic head, wherein the track on the front gap side is formed equal to the track width on the front gap side, and the track width on the back gap side is gradually narrowed.
Description
제1도는 종래 자기헤드의 제조공정도1 is a manufacturing process diagram of a conventional magnetic head
제2도는 종래 자기헤드의 자기회로도2 is a magnetic circuit diagram of a conventional magnetic head
제3도는 종래 자기헤드의 접촉면적을 나타낸 것으로,3 shows the contact area of a conventional magnetic head.
(a)는 프론트갭과 백갭의 접촉면에 대한 절단면 사시도(a) is a cutaway perspective view of the front gap and the back gap contact surface
(b)는 (a)에서 C-core와 I-core에 대한 측면도(b) is a side view of C-core and I-core in (a).
제4도는 종래 자기헤드에서 C-core와 I-core간의 접촉면적을 나타낸 상태로서,4 is a diagram showing a contact area between a C-core and an I-core in a conventional magnetic head.
(a)는 core간의 어긋남과 실제 접촉면적도(a) shows the gap between cores and the actual contact area
(b)는 프론트갭 부위의 접촉면적 및 트랙감소 상태도(b) shows the contact area and track reduction state of the front gap area.
제5도는 본 발명에 의한 트랙홈 가공상태도5 is a track groove processing state diagram according to the present invention
제6도는 본 발명 헤드의 접촉면적도6 is a contact area of the head of the present invention
제7도는 본 발명의 헤드 구성도7 is a head configuration of the present invention
제8도는 본 발명의 타실시예를 나타낸 트랙가공홈 상태도8 is a track processing groove state diagram showing another embodiment of the present invention
본 발명은 MIG형 자기헤드에 관한 것으로, 특히 자기저항을 충분히 작게하여 헤드의 효율을 극대화하고 테이프 접동면이 마모하여 갭깊이가 변화하여도 트랙폭이 변화없는 양호한 기록재생 가능한 헤드구조에 관한 것이다.The present invention relates to a MIG-type magnetic head, and more particularly, to a good recording and reproducing head structure in which the magnetic resistance is sufficiently small to maximize the efficiency of the head and the track width does not change even when the tape sliding surface is worn and the gap depth is changed. .
최근 VTR등의 자기기록 기술추세가 사용주파수의 고주파수화 및 기록밀도의 고밀도화 진행에 따라, 이에 대응하기 위해 자기헤드 트랙(track)폭의 협소화, 고포화 자속밀도를 갖는 센더스트(sendust)의 금속막을 페라이트(ferrite)의 강자성 산화물 위에 증착시킨 이른바 MIG(Metal in Gap)가 있다.In recent years, magnetic recording technology such as VTR has been used to increase the frequency of use frequency and increase the density of recording density. There is a so-called MIG (Metal in Gap) in which a film is deposited on a ferrite ferromagnetic oxide.
이와같은 자기헤드의 제조방법은 제1도와 같다.The manufacturing method of such a magnetic head is shown in FIG.
(a)와 같은 ferrite bar를 이용하여,Using a ferrite bar like (a),
(b)와 같이 C-bar 및 I-bar에 각각 권선홈(1) 및 노취(notch)가공과 트랙홈(2)을 가공한 후 접합면을 햅핑(lapping)등의 가공방법으로 면처리하고, (c)와 같이 C-bar에 트랙홈(2')가공후, (d)와 같이 C-bar 및 I-bar의 접합면에 센더스트등의 강자성 금속막(3)갭막을 성막하고, (e)와 같이 C-bar 및 I-bar의 대향면을 맞대어 고온에서 글라스(4)(Glass)로 접합한다.As shown in (b), after winding groove 1, notch processing, and track groove 2 are machined on C-bar and I-bar, respectively, the surface of the joint surface is processed by lapping, etc. After the track groove 2 'is processed in the C-bar as shown in (c), a ferromagnetic metal film (3) gap film such as a sender is formed on the joint surface of the C-bar and the I-bar as shown in (d), As shown in (e), the opposing surfaces of C-bar and I-bar are bonded to each other at high temperature with glass (Glass).
이렇게 접합된 것을 GBB(Glass Bound Bar)라 부르며, 이 GBB를 휠(wheel)이나 와이어톱(wire saw)등으로 칩(chip)상태로 절단(slicing)하고 R연마함으로서 (바)와 같은 형태의 칩을 얻게 된다.This joint is called GBB (Glass Bound Bar), and this GBB is cut into chips with wheels or wire saws and polished with R. You get a chip.
상기의 트랙홈(2)(2')가공은 제1도의 (b) 및 (c)와 같이 직선적으로 가공하기 때문에 테이프와 접하는 프론트갭(fornt gap)쪽의 트랙(Tf)와 반대쪽인 백갭(back gap) 쪽의 트랙폭(Tb)이 똑같은 크기가 되는 구조이다.Since the track grooves 2 and 2 'are processed linearly as shown in FIGS. 1B and 1C, the back gap opposite to the track Tf on the fort gap side in contact with the tape Back gap) track structure (Tb) is the same size.
일반적인 자기헤드의 자기회로는 제2도와 같다.The magnetic circuit of a general magnetic head is shown in FIG.
자기헤드 효율과 자기저항의 관계를 식으로 나타내면 아래와 같다.The relation between the magnetic head efficiency and the magnetoresistance is expressed as follows.
여기서 ∑Rm=Rfg+Rbg+RC1+RC2 Where ∑Rm = R fg + R bg + R C1 + R C2
즉, 자기헤드의 접동면 쪽 front gap의 자기저항 Rfg에 대해 반대쪽의 back gap의 자기저항 Rbg와 C-core 및 I-core의 자기저항 RC1, RC2와의 총합 자기저항 ∑Rm이 작아야 헤드의 효율이 좋아진다.In other words, the sliding surface side of the front gap fg R reluctance back gap bg of the magnetic resistance R and the C-core and I-core magnetic resistance R C1, R C2 between the total reluctance of the ΣRm opposite to the magnetic head of a small Head efficiency is improved.
따라서 back gap의 자기저항 Rbg는 작아야 좋고, 그런 이유로 back gap의 접촉면적(I-core 및 I-core와의)은 front gap의 접촉면적에 비해 훨씬 큰 구조를 하고 있다.Therefore, the magnetoresistance R bg of the back gap should be small, and therefore the contact area of the back gap (with I-core and I-core) is much larger than that of the front gap.
그러나 제1도와 같은 종래의 헤드구조는 (b) 및 (다)와 같이 front gap쪽의 트랙 Tf와 back gap쪽 트랙폭 Tb가 같은 크기이고, 제3도에서와 같이 그 트랙폭은 곧 I-bar C-bar의 접촉면적의 한변의 길이가 되고, 트랙폭 Tf는 코아두께인 Tc의 1/10 크기밖에 안되는 구조이다.However, in the conventional head structure as shown in FIG. 1, the track width T f on the front gap and the track width T b on the back gap are the same size as in (b) and (c), and as shown in FIG. It is the length of one side of the contact area of I-bar C-bar, and the track width T f is only 1/10 of the core thickness T c .
따라서 제1도의 (b) 및 (c)의 트랙홈 가공시 가공공차 (제4도의 (b))에 의해 I 및 C-bar간에 어긋남이 있고 (e)의 glass bonding 공정시 I-bar와 C-bar를 맞대어 접합할 때 제4도와 같이 각도 θ만큼 어긋남이 있게 되어 실제의 I 및 C-bar의 접촉면적이 줄어들게 된다.Therefore, there is a deviation between I and C-bar due to the processing tolerance (Fig. 4 (b)) in the track groove processing of FIGS. 1 (b) and (c), and I-bar and C in the glass bonding process of (e). When joining -bar to each other, as shown in Fig. 4, there is a deviation by the angle θ, which reduces the actual contact area of I and C-bar.
이렇게 되면 자기저항 Rbg가 크게 되어 헤드효율이 감소되는 문제가 생긴다.This causes a problem that the magnetoresistance R bg becomes large and the head efficiency decreases.
또한 헤드 사용시 자기 테이프와의 마찰로 헤드의 접동면이 마모되어 Gd가 줄어들면 유효 헤드트랙폭이 감소하는 문제가 생긴다.In addition, when the head is used, the sliding surface of the head is worn out by friction with the magnetic tape, so that the effective head track width decreases when the Gd decreases.
본 발명은 상기한 종래의 문제점을 해결하기 위해 안출한 것으로, 트랙홈 가공시의 가공가공차 및 어긋남이 있어도 실제 접촉면적은 변화가 없게 하여 자기 저항이 증가하지 않게 하므로 헤드 효율을 높일 수 있고, 테이프 접동면 마모로 인한 갭깊이가 변화하여도 트랙폭이 변화없는 양호한 기록, 재생할 수 있는 자기헤드를 얻고자 하는데 목적이 있다.The present invention has been made to solve the above-mentioned conventional problems, and even if there is a machining gap and a deviation in the track groove processing, the actual contact area does not change so that the magnetic resistance does not increase, so that the head efficiency can be increased. It is an object of the present invention to obtain a magnetic head capable of good recording and reproducing without changing the track width even if the gap depth due to tape sliding surface wear is changed.
이하 본 발명을 설명한다.Hereinafter, the present invention will be described.
본 발명은 자기헤드를 구성하는 I-bar와 C-bar 중 어느 하나의 bar는 front gap쪽의 트랙폭과 back gap쪽의 트랙폭을 동일하게 하고 나머지 한 bar는 front gap쪽 track을 상기 front gap쪽의 트랙폭과 동일하게 형성하고 back gap쪽의 트랙폭은 점차적으로 좁게 한 구조로 이루어 진다.According to the present invention, any one bar of the I-bar and the C-bar constituting the magnetic head has the same track width at the front gap and the track width at the back gap, and the other bar has the front gap track at the front gap. It has the same width as the track width on the side, and the track width on the back gap is gradually narrowed.
제5도는 상기한 구조에 대한 트랙가공 공정의 실시예를 나타낸 것으로, 제5도가 제1도(종래의 제조공정)와 상이한 것은 트랙가공 공정만 상이하고 기타의 공정은 모두 동일하다.FIG. 5 shows an embodiment of the track processing process for the above-described structure, and FIG. 5 differs from FIG. 1 (the conventional manufacturing process) only in the track processing process and all other processes are the same.
즉, 본 발명의 특징은 C-bar와 I-bar간의 트랙형상이 다르다는데 있다.That is, the feature of the present invention is that the track shape is different between C-bar and I-bar.
제5도의 (a)는 C-bar를, (b)는 I-bar를 나타낸 것으로, C-bar의 트랙홈(2')가공은 종래와 동일하게 front gap부위의 트랙폭(Tf)과 back gap부위의 트랙폭(Tb)이 같도록 다이아 몬드 휠(Diamond wheel)과 같은 절삭공구로 가공한다.(A) of FIG. 5 shows C-bar, and (b) shows I-bar. The processing of track groove 2 'of C-bar is similar to that of track width T f of the front gap. It is machined with a cutting tool such as a diamond wheel so that the track width (T b ) of the back gap is the same.
I-bar의 경우는 모재인 ferrite bar에 일정각도로 뉘어서, back쪽으로 감에 따라 트랙홈(5)의 폭이 좁고 얕게 되도록 하여 가공한다.In the case of the I-bar, it is laid at a certain angle on the ferrite bar, which is the base material, and processed so that the width of the track groove 5 becomes narrow and shallow as it goes toward the back.
상기의 일정각도는 I-bar인 트랙홈의 길이 ℓ이 C-bar의 ℓ'보다 조금 길게 되도록 설정하면 된다(back gap부위 접촉면적에 홈이 생기지 않도록).The predetermined angle may be set such that the length l of the track groove which is I-bar is slightly longer than l 'of the C-bar (so that no groove is formed in the contact area of the back gap region).
다음에 I-bar 및 C-bar에 종래와 동일한 방법으로 강자성 금속막 및 gap 막을 Sputtering 등의 방법으로 성막시켜 한쌍의 I 및 C-bar의 대향편을 맞대어 glass로 접합한다.Next, a ferromagnetic metal film and a gap film are formed on the I-bar and the C-bar in the same manner as in the prior art by sputtering or the like, and a pair of opposing pieces of I and C-bar are joined to glass.
이후의 공정은 종래와 동일하게 본 발명의 헤드칩을 제7도와 같이 얻게 된다.The subsequent step is to obtain the head chip of the present invention as shown in FIG.
제6도는 상기와 같이 제조하여서된 접합면에 대한 절단면도로서 I-core의 접촉가능한 부분이 C-core의 접촉가능한 부분에 비해 훨신 크기 때문에 조금 어긋나 접합되어도 I 및 C-bar간의 접촉면적은 변화가 없게 된다.6 is a cutaway view of the joint surface manufactured as described above, and the contact area between I and C-bar is changed even though the contactable part of the I-core is much larger than the contactable part of the C-core. There will be no.
따라서 자기저항 Rbg가 커져서 헤드 효율이 감소되는 문제가 해결된다.Therefore, the problem that the head efficiency is reduced by increasing the magnetoresistance R bg is solved.
또한 종래헤드의 문제점인 헤드 사용시 자기 Tape와의 마찰로 헤드의 접동면이 마모가 되어 Gd가 줄어들면 유효 헤드트랙이 감소하는 문제도 해결된다.In addition, when the head is used, which is a problem of the conventional head, the sliding surface of the head is worn out by friction with the magnetic tape, so that the effective head track is reduced when the Gd decreases.
유효 헤드트랙(ETW)란 I-core의 C-core의 실제로 접촉폭을 말한다.Effective head track (ETW) is the actual contact width of the C-core of the I-core.
제8도는 본발명의 다른 실시예를 나타낸 것으로, I-bar의 트랙홈(2) 가공은 종래와 동일하게 front gap 부위의 트랙인 Tf와 back gap부위의 트랙 Tb를 동일한 크기로 가공하고 C-bar의 경우에는 모재인 ferrite bar를 일정각도로 뉘여서 back쪽으로 감에 따라 트랙홈(6)의 폭이 좁아지고 얇게 되도록 하여 길이 ℓ이 back gap부위접촉 면적에 도달하지 않도록 가공한다.8 shows another embodiment of the present invention, in which the processing of the track groove 2 of the I-bar is performed in the same way as the conventional track T f of the front gap and the track T b of the back gap. In the case of C-bar, the ferrite bar, which is the base material, is laid at a certain angle so that the width of the track groove 6 becomes narrower and thinner as it moves toward the back, so that the length ℓ does not reach the back gap area contact area.
이상에서와 같이 본 발명은 I-bar와 C-bar 중 어느 하나의 트랙홈을 back gap쪽으로 갈수록 폭은 좁고, 깊이를 얇게 하여 back gap의 자기저항을 충분히 작게 하여 헤드의 효율을 극대화 할 수 있으며, 자기헤드의 테이프 접동면이 마모해서 갭깊이가 변화하여도 트랙폭이 변화없는 양호한 기록재생 할 수 있는 자기헤드를 얻게 된다.As described above, in the present invention, the width of the track groove of any one of the I-bar and the C-bar toward the back gap is narrower, and the depth is thinner to sufficiently reduce the magnetoresistance of the back gap to maximize the head efficiency. Therefore, even if the tape sliding surface of the magnetic head wears out, even if the gap depth changes, a magnetic head capable of good recording and reproduction without changing the track width is obtained.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950001060A KR0136418B1 (en) | 1995-01-23 | 1995-01-23 | Metal in gap type magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950001060A KR0136418B1 (en) | 1995-01-23 | 1995-01-23 | Metal in gap type magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960030094A KR960030094A (en) | 1996-08-17 |
| KR0136418B1 true KR0136418B1 (en) | 1998-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019950001060A KR0136418B1 (en) | 1995-01-23 | 1995-01-23 | Metal in gap type magnetic head |
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| KR (1) | KR0136418B1 (en) |
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1995
- 1995-01-23 KR KR1019950001060A patent/KR0136418B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR960030094A (en) | 1996-08-17 |
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