JPH0376528B2 - - Google Patents
Info
- Publication number
- JPH0376528B2 JPH0376528B2 JP58207414A JP20741483A JPH0376528B2 JP H0376528 B2 JPH0376528 B2 JP H0376528B2 JP 58207414 A JP58207414 A JP 58207414A JP 20741483 A JP20741483 A JP 20741483A JP H0376528 B2 JPH0376528 B2 JP H0376528B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- magnetic
- width
- gap
- 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
- G11B5/127—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
- G11B5/1871—Shaping or contouring of the transducing or guiding surface
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はビデオ・テープ・レコーダ（VTR）
などの磁気ヘツドに係る。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a video tape recorder (VTR).
Related to magnetic heads such as.
従来のVTRなどの磁気記録再生装置における
磁気ヘツドにおいては、その磁気ヘツド幅は回転
方向に均一なものが一般的であつた。しかも磁気
ヘツドの磁気ギヤツプ部は、他の部分よりも幅が
狭く、その磁気ギヤツプ部の両サイドにはボンデ
イング部材としてのガラスが充てんしてあつた。
In conventional magnetic heads in magnetic recording and reproducing devices such as VTRs, the width of the magnetic head is generally uniform in the rotational direction. Moreover, the magnetic gap part of the magnetic head was narrower than the other parts, and both sides of the magnetic gap part were filled with glass as a bonding member.
上記従来技術は磁気テープやラツピングテープ
等を走行させた時にヘツドギヤツプ部近傍の摩耗
が早く進み、磁気ヘツド先端部が平坦化すること
について配慮がされておらず、磁気ヘツドと磁気
テープとの接触がギヤツプ近傍で不安定となり出
力が低下するという問題があつた。
The above-mentioned conventional technology does not take into account the fact that when a magnetic tape, wrapping tape, etc. is run, the wear near the head gap progresses rapidly and the tip of the magnetic head becomes flattened, causing contact between the magnetic head and the magnetic tape. There was a problem that the output became unstable near the gap and the output decreased.
本発明の目的は、磁気テープやラツピングテー
プなどを走行させた場合に磁気ヘツド先端がほぼ
均一な摩耗状態となり、安定した記録または再生
を行うことが容易な磁気ヘツドを提供することに
ある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head in which the tip of the magnetic head is worn almost uniformly when a magnetic tape, wrapping tape, etc. is run, and stable recording or reproduction can be easily performed.
上記目的を達成するために、磁気テープと磁気
ヘツドの摺動接触する領域の磁気ヘツド幅を、磁
気ギヤツプ部を中心として、磁気ヘツドの回転方
向および反回転方向に漸次減少するように形成
し、かつ磁気ギヤツプ部の幅をｌ、磁気ヘツドエ
ツジ部の磁気ヘツド幅をWe、磁気ギヤツプ部の
磁気ヘツドの幅をWcとしたときに、
ｌ＜We＜Wc
となるようにし、磁気ヘツドの磁気ギヤツプの両
側のガラス材によるボンデイング部を磁気ヘツド
の幅Wcとなるようにしたものである。
In order to achieve the above object, the width of the magnetic head in the sliding contact area between the magnetic tape and the magnetic head is formed so as to gradually decrease in the rotational direction and counter-rotation direction of the magnetic head with the magnetic gap as the center. Also, when the width of the magnetic gap is l, the width of the magnetic head at the edge of the magnetic head is We, and the width of the magnetic head at the magnetic gap is Wc, then l<We<Wc, and the width of the magnetic gap of the magnetic head is The bonding portions made of glass material on both sides are made to have the width Wc of the magnetic head.
磁気ギヤツプ部の両側にボンデイングのために
充てんしたガラス材は磁気ギヤツプ部における磁
気テープの接触面積を増大させ、接触面圧を低下
させる。また、磁気ヘツドの回転方向および反回
転方向に漸次磁気ヘツド幅を減少したので、磁気
ヘツドエツジ部の面圧は増大するが、ガラス材を
充てんしない時の磁気ギヤツプ部の面圧よりは小
さい。
The glass material filled on both sides of the magnetic gap portion for bonding increases the contact area of the magnetic tape in the magnetic gap portion and reduces the contact surface pressure. Furthermore, since the width of the magnetic head is gradually reduced in the rotational direction and counter-rotation direction of the magnetic head, the surface pressure at the magnetic head edge increases, but it is smaller than the surface pressure at the magnetic gap when it is not filled with glass material.
一方、磁気ギヤツプ部の磁気ヘツドの平均の硬
さは、ガラス材を充てんしたことにより、ガラス
材が充てんされない時に比べて磁気ヘツドエツジ
部の平均の硬さが低い。また、磁気ヘツドエツジ
部の硬さは、ガラス材を充てんしない所の磁気ギ
ヤツプ部の硬さにほぼ等しい。 On the other hand, the average hardness of the magnetic head in the magnetic gap part is lower than that of the magnetic head edge part because it is filled with glass material, compared to when it is not filled with glass material. Further, the hardness of the magnetic head edge portion is approximately equal to the hardness of the magnetic gap portion without being filled with glass material.
磁気ヘツドの摩耗は、面圧の増加に応じて増
し、硬さに応じて減少するので、磁気ギヤツプ部
ではガラス材充てんによる平均硬さの低下を、面
圧を抑えることで補償できる。また、磁気ヘツド
エツジ部では、接触面積の低下により面圧が増大
した分、平均硬さで補償できるので、磁気ヘツド
の各部で摩耗を均一にできる。 Since the wear of the magnetic head increases as the surface pressure increases and decreases as the hardness increases, the reduction in average hardness due to glass filling in the magnetic gap can be compensated for by suppressing the surface pressure. Furthermore, in the magnetic head edge portion, the increase in surface pressure due to the reduction in the contact area can be compensated for by the average hardness, so that wear can be made uniform at each portion of the magnetic head.
これにより、磁気ヘツドの摩耗による形状のゆ
がみを抑制でき、磁気テープと磁気テープとの接
触が安定になり、磁気ヘツド出力の低下を防止で
きる。 This makes it possible to suppress distortion of the shape of the magnetic head due to wear, stabilize the contact between the magnetic tapes, and prevent a decrease in the output of the magnetic head.
以下本発明の実施例を図面を参照して説明す
る。
Embodiments of the present invention will be described below with reference to the drawings.
第１図および第２図は本発明の磁気ヘツドの一
実施例を示すもので、これらの図において、磁気
ヘツドＭはＩ形コア１とＣ形コア２とから構成さ
れている。このＩ形コア１とＣ形コア２は磁気ギ
ヤツプＧを形成する。この磁気ギヤツプＧの幅ｌ
は第１図に示すように狭く形成されている。この
磁気ギヤツプＧの両側にはガラス材によるボンデ
イング部３が形成されている。そして、Ｉ形コア
１とＣ形コア２とによつて構成される磁気ヘツド
Ｍの磁気ギヤツプＧ近傍の幅Wcはその回転方向
および反回転方向エツジ部４の幅Weに比して大
きく設定している。この磁気ヘツドＭの幅We，
Wcは一定幅のＩ形コア、Ｃ形コアの磁気ヘツド
側の側面を切削加工することによつて形成するこ
とができる。このような幅の設定は磁気ヘツドＭ
のエツジ部４よりも磁気ギヤツプＧ部近傍での磁
気テープ接触面積を大きくし、磁気ギヤツプＧ部
分での磁気テープ接触面圧を小さくする作用を発
揮する。 1 and 2 show an embodiment of the magnetic head of the present invention. In these figures, the magnetic head M is composed of an I-shaped core 1 and a C-shaped core 2. FIG. The I-shaped core 1 and the C-shaped core 2 form a magnetic gap G. The width l of this magnetic gap G
is narrowly formed as shown in FIG. Bonding portions 3 made of glass are formed on both sides of this magnetic gap G. The width Wc near the magnetic gap G of the magnetic head M constituted by the I-shaped core 1 and the C-shaped core 2 is set to be larger than the width We of the edge portion 4 in the rotation direction and counter-rotation direction. ing. The width We of this magnetic head M,
Wc can be formed by cutting the side surface on the magnetic head side of an I-shaped core or C-shaped core having a constant width. Such a width setting is possible when the magnetic head M
The magnetic tape contact area near the magnetic gap G portion is made larger than that at the edge portion 4, and the magnetic tape contact surface pressure at the magnetic gap G portion is reduced.
次に上述した本発明の磁気ヘツドの一実施例の
作用を第３図を参照して説明する。 Next, the operation of one embodiment of the magnetic head of the present invention described above will be explained with reference to FIG.
前述した発明の背景の項で述べたように、従来
の磁気ヘツドは同一の磁気ヘツド幅を有する構造
になつているが、一般にボンデイング部３はコア
部に比して硬度が低いので、磁気テープやラツピ
ングテープが磁気ヘツド上を走行すると、摩耗し
やすいガラス材を用いたボンデイング部３の摩耗
が促進される。その結果、磁気ギヤツプ部に加わ
る面圧が増加し、磁気テープＴと摺動する磁気ヘ
ツド部分の中でも、特に磁気ヘツドの磁気ギヤツ
プＧ部分の近傍が摩耗し、第３図の２点鎖線で示
すように平坦な形状となる。このように磁気ヘツ
ド先端が平坦になると、磁気テープ剛性が大であ
る磁気テープを用いた場合、磁気テープＴが磁気
ヘツドから距離ｈだけ離れる傾向を示す。これに
より、磁気ヘツド出力が低下する。この磁気ヘツ
ド出力の低下についてもう少し述べると、すき間
ｈによる磁気ヘツド出力の低下54.6h／λ（dB）
で求めることができる。ただしλは記録波長であ
る。VTRの場合、記録波長は約1μｍである。磁
気ヘツド先端部分の摩耗量δは１〜2μｍ程度の
ものが最も多い。磁気テープと磁気ヘツドとのす
き間ｈは磁気テープが変形して磁気ヘツドになじ
むため、前耗量δより小さい。しかし、記録波長
λが短かいため、例えばすき間ｈが0.02μｍのと
き、約1.1dBの出力低下が生じ、またすき間ｈが
0.05μｍのときには約2.7dBの出力低下が生じる。
これに対し、本発明においては、磁気ヘツドにお
ける磁気ギヤツプＧ部分の幅Wcをそのエツジ部
４の幅Weに比して大きくしているので、磁気ギ
ヤツプＧ部の近傍では磁気テープが接触する面積
が磁気ヘツドエツジ部４よりも広くなる。その結
果、磁気ギヤツプＧ部における磁気テープの接触
面圧は磁気ヘツドエツジ部４より小さくなり、磁
気ギヤツプＧの摩耗が少なくなり、磁気テープを
磁気ギヤツプＧ部分に良好に接触させることが可
能となり、安定した出力を得ることができる。 As mentioned in the Background of the Invention section, conventional magnetic heads are structured to have the same magnetic head width, but the bonding part 3 generally has lower hardness than the core part, so the magnetic tape When the wrapping tape runs over the magnetic head, wear of the bonding part 3 made of glass material, which is easily worn, is accelerated. As a result, the surface pressure applied to the magnetic gap increases, and among the parts of the magnetic head that slide on the magnetic tape T, the part of the magnetic head in particular near the magnetic gap G is worn out, as shown by the two-dot chain line in Fig. 3. It has a flat shape. When the tip of the magnetic head becomes flat in this manner, when a magnetic tape with high magnetic tape rigidity is used, the magnetic tape T tends to move away from the magnetic head by a distance h. This reduces the magnetic head output. To explain this decrease in magnetic head output in more detail, the decrease in magnetic head output due to the gap h is 54.6h/λ (dB).
It can be found by However, λ is the recording wavelength. In the case of a VTR, the recording wavelength is approximately 1 μm. The amount of wear δ at the tip of the magnetic head is most often about 1 to 2 μm. The gap h between the magnetic tape and the magnetic head is smaller than the wear amount δ because the magnetic tape deforms and adapts to the magnetic head. However, because the recording wavelength λ is short, for example, when the gap h is 0.02 μm, the output decreases by about 1.1 dB.
When the thickness is 0.05 μm, the output decreases by approximately 2.7 dB.
On the other hand, in the present invention, the width Wc of the magnetic gap G portion of the magnetic head is made larger than the width We of the edge portion 4, so that the magnetic tape contacts the area near the magnetic gap G portion. is wider than the magnetic head edge portion 4. As a result, the contact surface pressure of the magnetic tape at the magnetic gap G section is smaller than that at the magnetic head edge section 4, reducing the wear of the magnetic gap G, making it possible to bring the magnetic tape into good contact with the magnetic gap G section, and making it stable. You can get the following output.
一方、このように構成したことにより、磁気ヘ
ツドのエツジ部４は磁気ギヤツプ部に比べて面圧
が大きくなり、この部分の摩耗量が増加するが、
幅WeとWcとの比を０＜We＜Wc＜１の範囲内で
最適化することにより、磁気ギヤツプＧ部近傍と
磁気ヘツドエツジ部４との摩耗量を、ほぼ均一に
制御することが可能である。 On the other hand, with this configuration, the surface pressure on the edge portion 4 of the magnetic head is greater than that on the magnetic gap portion, and the amount of wear in this portion increases.
By optimizing the ratio of the widths We and Wc within the range of 0<We<Wc<1, it is possible to control the amount of wear near the magnetic gap G portion and the magnetic head edge portion 4 almost uniformly. be.
なお、上述の実施例は１つの磁気ギヤツプを有
する磁気ヘツドに関して説明したが、第４図に示
すようにアジマス角の異なる２つの磁気ヘツド
M1，M2が近接して配置した形式の磁気ヘツドの
場合、および第５図に示すように１つの磁気ヘツ
ドに２つの磁気ギヤツプG1，G2を近接して配置
した形式の磁気ヘツドの場合にも適用できる。ま
た、上述の例では、磁気ヘツドの幅Weと幅Wcと
の間を、直線的に変化する場合について述べた
が、この間の形状を曲線に形成してもよいし、段
階的に変化するように形成してもよい。さらに、
磁気テープとの面圧が高くなる磁気ヘツドの回転
方向のみの磁気ヘツド幅を変化させてもよいこと
は勿論である。 Although the above embodiment has been described with respect to a magnetic head having one magnetic gap, two magnetic heads with different azimuth angles as shown in FIG.
In the case of a magnetic head in which M 1 and M 2 are arranged close to each other, and in the case of a magnetic head in which two magnetic gaps G 1 and G 2 are arranged in one magnetic head in close proximity to each other as shown in FIG. It can also be applied in the case of Furthermore, in the above example, the width We and the width Wc of the magnetic head are changed linearly, but the shape between them may be formed into a curved line, or it may be changed stepwise. It may be formed into moreover,
Of course, the width of the magnetic head may be changed only in the direction of rotation of the magnetic head where the contact pressure with the magnetic tape is high.
本発明によれば、磁気ヘツドの摩耗の均一性が
保たれ、磁気ヘツド出力を経時変化なく常に良好
に保つことができるので、信頼性を著しく向上さ
せることができる。
According to the present invention, the uniformity of the wear of the magnetic head is maintained, and the output of the magnetic head can always be maintained at a good level without any change over time, so that reliability can be significantly improved.
第１図は本発明の磁気ヘツドの一実施例の正面
図、第２図は第１図の−矢視による磁気ヘツ
ド先端の平面図、第３図は第１図に示す本発明の
磁気ヘツドの一実施例の動作説明図、第４図およ
び第５図は各本発明の磁気ヘツドの他の実施例の
磁気ヘツド先端の平面図である。
Ｍ……磁気ヘツド、１……Ｉ形コア、２……Ｃ
形コア、３……ガラス材によるボンデイング部、
４……磁気ヘツドのエツジ部、Ｇ……磁気ギヤツ
プ。
1 is a front view of an embodiment of the magnetic head of the present invention, FIG. 2 is a plan view of the tip of the magnetic head as viewed from the - arrow in FIG. 1, and FIG. 3 is a view of the magnetic head of the present invention shown in FIG. 1. FIGS. 4 and 5 are plan views of the tips of magnetic heads of other embodiments of the magnetic head according to the present invention. M...Magnetic head, 1...I-type core, 2...C
shaped core, 3...bonding part made of glass material,
4...edge part of magnetic head, G...magnetic gap.
Claims (1)
周に磁気テープを装架させて記録再生を行う磁気
記録再生装置用の磁気ヘツドであつて、磁気テー
プと磁気ヘツドの摺動接触する領域の該磁気ヘツ
ド幅が、磁気ギヤツプ部を中心として該磁気ヘツ
ドの回転方向および反回転方向に漸次減少するよ
うに形成され、かつ前記磁気ギヤツプ部の幅を
ｌ、前記磁気ヘツドエツジ部の磁気ヘツド幅を
We、前記磁気ギヤツプ部における磁気ヘツドの
幅をWcとしたときに、 ｌ＜We＜Wc となるようにし、前記磁気ギヤツプ部の両側のガ
ラス材によるボンデイング部を該磁気ヘツドの幅
Wcとなるようにしたことを特徴とする磁気ヘツ
ド。 ２ 前記磁気ヘツドの回転方向に直角な方向の厚
みを、前記磁気ギヤツプを中心として前記磁気ヘ
ツドの回転方向および反回転方向に漸次減少する
ように形成したことを特徴とする特許請求の範囲
第１項に記載の磁気ヘツド。[Scope of Claims] 1. A magnetic head for a magnetic recording and reproducing device that is attached to a cylinder and performs recording and reproducing by mounting a magnetic tape on the outer periphery of the cylinder, the magnetic head having sliding contact between the magnetic tape and the magnetic head. The width of the magnetic head is formed so that the width of the magnetic head gradually decreases in the rotation direction and counter-rotation direction of the magnetic head around the magnetic gap portion, and the width of the magnetic gap portion is l, and the magnetic head edge portion of the magnetic head is head width
We and the width of the magnetic head at the magnetic gap section are Wc, so that l<We<Wc, and the bonding portions made of glass material on both sides of the magnetic gap section are set to the width of the magnetic head.
A magnetic head characterized in that it is configured to have Wc. 2. The thickness of the magnetic head in the direction perpendicular to the rotational direction of the magnetic head is formed so as to gradually decrease in the rotational direction and counter-rotational direction of the magnetic head with the magnetic gap as the center. The magnetic head described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20741483A JPS60101706A (en) | 1983-11-07 | 1983-11-07 | magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20741483A JPS60101706A (en) | 1983-11-07 | 1983-11-07 | magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60101706A JPS60101706A (en) | 1985-06-05 |
| JPH0376528B2 true JPH0376528B2 (en) | 1991-12-05 |
Family
ID=16539348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20741483A Granted JPS60101706A (en) | 1983-11-07 | 1983-11-07 | magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60101706A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02240814A (en) * | 1989-03-15 | 1990-09-25 | Hitachi Ltd | thin film magnetic head |
| JPH05205208A (en) * | 1992-01-28 | 1993-08-13 | Matsushita Electric Ind Co Ltd | Magnetic head and method of manufacturing magnetic head |
| US6023396A (en) * | 1997-12-23 | 2000-02-08 | Ampex Corporation | Magnetic head tip design to reduce dynamic spacing loss and improve signal quality in high-density helical scanning system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS566992U (en) * | 1979-06-28 | 1981-01-21 | ||
| JPS5817619U (en) * | 1981-07-27 | 1983-02-03 | 日本コロムビア株式会社 | magnetic head |
| JPS59194116U (en) * | 1983-06-07 | 1984-12-24 | クラリオン株式会社 | magnetic head |
-
1983
- 1983-11-07 JP JP20741483A patent/JPS60101706A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60101706A (en) | 1985-06-05 |
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