JPS58153219A - Peak type magnetic head - Google Patents

Abstract

PURPOSE:To obtain excellent output characteristics in a short-wavelength range, by bringing the contacting length of a core half bodies at the run-out side of a magnetic recording medium to nearly <=3 times as great as the maximum recording wavelength of a recorded signal. CONSTITUTION:A magnetic head 1 is made into a peak type head by shortening the lengths l1 and l2 of magnetic recording medium sliding surfaces 4a and 4b of the front end surfaces of core half bodies 1a and 1b as much as possible, thereby increasing the pressure of contacting with the magnetic recording medium. In concrete, the contacting lengths l1 and l2 are set at <=3 times as great as the maximum value of recording wavelength lambda, i.e. 40-50mum. Consequently, the pressure which is in contact with a tape is increased and excellent output characteristics in a short-wavelength range are obtained even when the running tension of the recording medium is decreased.

Description

【発明の詳細な説明】 本発明は磁気ヘッド、％にビデオテープＶコー〆（ＶＴ
Ｒ）等に用いられる尖頭型磁気ヘッドに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic head, a video tape V coater (VT
The present invention relates to a pointed magnetic head used in R), etc.

近年、ＶＴＲ等のｍｓ長磁気記帰技術の発展に伴い、磁
気ヘッドに対する出力感度及び短波長記録特性の向上が
要求される。即ち、高密度記録に伴い、配縁波長が短か
くなり、例えばＶＴＲでは１．２乃至１．４μｍ、ビデ
オ一体製カメラ、ビデオスチールカメラ等では０．５乃
至０．８μｍまで短かくなってきている。そのため磁気
ヘッドと磁気記録媒体（以下、単にテープという）との
分離損失が膨しく、記録波長なλ、磁気ヘッドとテープ
の隙間をｄとすれば Ｌ＝　５６　Ｘ　−（ｄＢ） λ で表わされる隙間損失の式により記録波長λ＝０．−で
は隙間ｄ≦０．０１＾ｍＫＬないと隙間損失が１　（ｄ
Ｂ）以上になり、記録時及び再生時に損失が生じること
になる。しかし、従来の磁気ヘッドではヘッドギャップ
周辺とテープとの摺接が不十分で隙間損失がＩＱ（ｄＢ
）以上圧なっていた。又、テープの表面性を向上し、摩
擦係数を小さくして走行の困難性を解決するためにテー
プの張力の低下を図っていたので磁気ヘッドとの摺接の
困難性を更に助長する傾向にあった。In recent years, with the development of ms-long magnetic recording technology for VTRs and the like, improvements in the output sensitivity and short wavelength recording characteristics of magnetic heads are required. That is, with high-density recording, the alignment wavelength has become shorter, for example, 1.2 to 1.4 μm in VTRs, and 0.5 to 0.8 μm in video integrated cameras, video still cameras, etc. There is. Therefore, the separation loss between the magnetic head and the magnetic recording medium (hereinafter simply referred to as tape) is enormous, and is expressed as L = 56 X - (dB) λ, where λ is the recording wavelength and d is the gap between the magnetic head and tape. According to the gap loss formula, the recording wavelength λ=0. -, if the gap d≦0.01^mKL, the gap loss is 1 (d
B) As a result, losses occur during recording and reproduction. However, in conventional magnetic heads, the sliding contact between the head gap and the tape is insufficient, resulting in gap loss of IQ (dB).
) The pressure was higher than that. In addition, efforts were made to reduce the tension of the tape in order to improve the surface properties of the tape and reduce the coefficient of friction to solve the difficulty of running, which tended to further exacerbate the difficulty of sliding contact with the magnetic head. there were.

そこで本発明は特ＫＭ１波長磁気記ｆｉｇおいて良好な
出力特性及び磁気記録媒体との摺接特性＃！得られる磁
気ヘッドを提供するものである。Therefore, the present invention provides a special KM1 wavelength magnetic recording device with good output characteristics and sliding contact characteristics with a magnetic recording medium! The present invention provides a magnetic head obtained by the present invention.

即ち、本発明の磁気ヘッドはコア半休対のうち。That is, the magnetic head of the present invention has a half-core core.

磁気記録媒体の逃げ側に位置するコア半休の磁気記録媒
体に対する蟲り・長さが磁気記録媒体に記録される信号
の記録最長波長の略３倍以下になるように尖頭状に形成
したものである。A magnetic recording medium with a half core located on the relief side of the magnetic recording medium, which is formed into a pointed shape so that the length is approximately three times or less the longest recording wavelength of the signal recorded on the magnetic recording medium. It is.

以下、図面について本発明の詳細な説明する。Hereinafter, the present invention will be described in detail with reference to the drawings.

第１図は本発明による磁気ヘッドの一例の斜視図であっ
て図において（１）は磁気ヘッド全体を示し、（１ｍ）
は磁気記録媒体の進入側の半休コア部、（１ｂ）は磁気
記録媒体の逃げ側のコア半休部である。（２）はコア半
休（ｉｌｍ）（ｌｂ）の先端面間に形成されたヘッドギ
ャップでその両端部にトラック幅を規制する凹部Ｃ２ｍ
）　（２ｂ）が形成され非磁性材（３）例えばガラスが
埋めこまれている。そしてコア半休（１ａ）（１ｂ）の
前端面の磁気記録媒体摺動面Ｃ４ｍ＞　（４ｂ）の長さ
愈１＊１２を極力短かくして尖頭型ヘッドに形成し、磁
気記録媒体との接触圧を増大するよ５に成し、良好な出
力特性及び当り特性を得ることができるように構成しで
ある。又、図において（４ａ’）及び（４ｂ’）はコア
半休（１ｍ）及び（１ｂ）の前端面倒の肩落し面、（５
）は巻線用窓孔であって記録媒体逃げ側コア半休（ｌｂ
）　Ｋ形成しである。尚、この巻線用窓孔（５）は磁気
記録媒体の進入側コア半休（１ｇ）に形成しても良く、
又、両コア半休（１１）（ｌｂ）に跨って形成しても良
いことはもちろんである。（６）は巻線用窓孔（５）を
通してコア牛体（ｌｂ）　Ｋ巻装されたコイルである。FIG. 1 is a perspective view of an example of a magnetic head according to the present invention. In the figure, (1) shows the entire magnetic head, and (1 m)
(1b) is a half-closed core portion on the entrance side of the magnetic recording medium, and (1b) is a half-closed core portion on the escape side of the magnetic recording medium. (2) is the head gap formed between the tip surfaces of the core half-opening (ilm) (lb), and the recess C2m at both ends of the head gap regulates the track width.
) (2b) is formed and a non-magnetic material (3) such as glass is embedded. The magnetic recording medium sliding surface C4m of the front end face of the core half-holes (1a) and (1b) is formed into a pointed head by making the length 1*12 of (4b) as short as possible, and the contact pressure with the magnetic recording medium is 5 to obtain good output characteristics and hit characteristics. In addition, in the figure (4a') and (4b') are the core half-rest (1m) and the shoulder drop surface of the front end of (1b), (5
) is a window hole for the winding, and the recording medium escape side core half-open (lb
) K formation. Incidentally, this winding window hole (5) may be formed in the entrance side core half hole (1g) of the magnetic recording medium,
Moreover, it goes without saying that it may be formed across both cores (11) (lb). (6) is a coil wound with a core (lb) through the winding window (5).

以上のように構成される磁気ヘッド（１）の各コア半休
（ｌａ）（ｌｂ）の磁気記録媒体摺動面（４ｍ）（４ｂ
）のそれぞれの長さｉｌｍ　ｉ２は種々検討した結果、
次に示す結果が得られた。The magnetic recording medium sliding surface (4m) (4b) of each core half (la) (lb) of the magnetic head (1) configured as described above
), the length ilm i2 of each is determined as follows after various studies:
The following results were obtained.

即ちメタルテープな用い、磁気ヘッドのトラツク８３３
岸 気ヘッドとの相対速度３．Ｏｆｎ／Ｓの条件において磁
気ヘッド（１）の摺動面（４ａ）及び（４ｂ）の長さ１
１及びε２（以下当り長さと称する）が従来の磁気ヘッ
ドの如く４５０μｍ乃至６００μｍの範囲では磁気ヘッ
ドと磁気記録媒体としてのテープの接触圧が不十分で第
２図において１１１人で示す如く配置波長λが０．５μ
ｆｆｌにおいて出力の低下が激しく磁気ヘッドとテープ
の接触が不十分で前述した隙間損失りが大さいことがわ
かる。That is, using a metal tape, the magnetic head track 833
Relative speed with the shore air head 3. Length 1 of the sliding surfaces (4a) and (4b) of the magnetic head (1) under the condition of Offn/S
1 and ε2 (hereinafter referred to as the perpendicular length) are in the range of 450 μm to 600 μm as in conventional magnetic heads, the contact pressure between the magnetic head and the tape serving as the magnetic recording medium is insufficient, and the arrangement wavelength is reduced as shown by 111 in FIG. λ is 0.5μ
It can be seen that in ffl, the output drops sharply, the contact between the magnetic head and the tape is insufficient, and the above-mentioned gap loss is large.

次Ｋｌり長さ１１４１ｇを極力小さくして記録波長λの
最大値４０ａｍ乃至５０μｍの３倍以下の長さに設定す
る０例えば轟たり長さＪ＊Ｑ２をそれぞれ２０μｍに設
定すると龜ｌＩＢで示す如く記録波長λがＱ，５ｇｎで
自鐘人で示す従来例より約１０ｄＢ出力が向上されるこ
とが認められる．更に、当り長さｌｌｔｇ！を２：１乃
至５：１の割合で非対称に変えた場合、例えば轟り長さ
１１を１２０１１ｍ　、尚り長さｔ２を５０μｍＫ設定
すると一ａＣで示す如く配置波長λが０．５μｍでは前
例（ＩｉｍｍｌＢ）の場合と同様に従来例（曲線人）よ
り約１０ｄＢ出力が向上され、又、記録波長λが２μｍ
以上では従来の磁気ヘッドと同等の出力特性が得られる
ことが認められる。Next, make the Kl length 1141g as small as possible and set it to a length less than three times the maximum value of the recording wavelength λ, 40 am to 50 μm. It is recognized that when the recording wavelength λ is Q and 5gn, the output is improved by about 10 dB compared to the conventional example shown by Jibanejin. Furthermore, the hit length is lltg! For example, if the rumble length 11 is set to 12011 m and the length t2 is set to 50 μmK, the arrangement wavelength λ is 0.5 μm as shown in 1aC, then the previous example ( As in the case of IimmlB), the output is improved by about 10 dB compared to the conventional example (curved), and the recording wavelength λ is 2 μm.
It can be seen from the above that output characteristics equivalent to those of conventional magnetic heads can be obtained.

このように磁気ヘッドの当り長さ１１ｄＬ２を記録最長
波長の略３倍以下になるように極力小さくすることＫよ
り短波長において出力が向上される。In this way, by making the contact length 11 dL2 of the magnetic head as small as possible to approximately three times the longest recording wavelength or less, the output can be improved at shorter wavelengths.

又、磁気ヘッドの轟り長さ＠１＊Ｑ２を極力小さぐする
ことによりテープに対する全体的な当り波形も良好とな
りテープの表藺件の向上に伴う走行性教養のためにテー
プテンションを１０ｇ前後に下げた走行系でも当り特性
が良好となった．又、摺動面においてギャップがテープ
逃げ側に偏っている場合、例えば侵入偶の当り長さ１１
が逃げ側の当り長さ１！に対し２：１乃至５：ｌの関係
にある時は磁気ヘッドとテープの轟りは更に良好となっ
た。In addition, by minimizing the rumble length @1*Q2 of the magnetic head, the overall waveform that hits the tape becomes good, and the tape tension can be adjusted to around 10g to improve running performance as the surface quality of the tape improves. The hitting characteristics were good even with the running system lowered to . In addition, if the gap on the sliding surface is biased toward the tape relief side, for example, if the contact length of the intrusion joint is 11
The hit length on the escape side is 1! On the other hand, when the relationship was between 2:1 and 5:l, the roar between the magnetic head and the tape became even better.

尚、テープの逃げ側の当り長さｆｆｉ，は記録最長波長
λｍｍ菫の１．５乃至３倍の時出力特性が最も良好とな
った。この場合テープの逃げ側の当り長さ１意が記録最
長波長λｍａｘ以下では長波長側の再生感度が得られな
い。又、ＶＴＲの場合の記録最長波長λｍａｘは４０μ
ｍ乃至５０μｍであるが画倫のみを出す、例えばビデオ
スチールカメラの場合は記録最長波長λｍｍｘは２０μ
ｍ乃至３０μｍでよく、この場合、ＦＭ変調のサイドバ
ンド即ち輝度信号をどの値に設定するかによって定まる
ことＫなる．従ってビデオスチールカメラの磁気ヘッド
においては当り長さ處１ｗ１，を更に小さくすることに
より出方特性が同上されることになる。The output characteristics were best when the contact length ffi on the escape side of the tape was 1.5 to 3 times the longest recording wavelength λmm violet. In this case, if the contact length of the escape side of the tape is less than the longest recording wavelength λmax, reproduction sensitivity on the long wavelength side cannot be obtained. In addition, the longest recording wavelength λmax in the case of a VTR is 40μ
m to 50 μm, but for example, in the case of a video still camera that only emits images, the longest recorded wavelength λmmx is 20 μm.
m to 30 μm, and in this case, it is determined by the value to which the sideband of FM modulation, that is, the luminance signal, is set. Therefore, in the magnetic head of a video still camera, the output characteristics can be improved by further reducing the contact length 1w1.

次に、第３図において本発明による磁気ヘッドの製造方
法の一例を説明する。Next, an example of a method for manufacturing a magnetic head according to the present invention will be explained with reference to FIG.

まず、第３図ムに示す如く７工ツイト票材より切り出さ
れた対のコア牛体ブロックＱυｒ１３の互いに対向する
内面（ｌ１ｍ）及び（ｉｌＭ）にその幅方向に貫通する
溝（ｌｌｂ）及び（１２ｂ）をヘッドギャップ（２）の
輻−の間隔で隔設し、一方のコア半休１１りの内面（１
２ｍ）の長手方向１ｃｌＩ（１２ｂ）と直交して後述す
る４）１１用窓孔となる凹溝Ｉを形成する。First, as shown in Fig. 3, grooves (llb) and (llb) penetrating in the width direction are formed in the mutually opposing inner surfaces (l1m) and (ilM) of a pair of core cow body blocks Qυr13 cut out from a 7-piece tweet sheet material. 12b) are spaced apart from each other by the width of the head gap (2), and the inner surface (1
2m) A groove I is formed to be perpendicular to the longitudinal direction 1clI (12b) and serve as a window hole for 4) 11, which will be described later.

このように形成したコア半休ブロックａυと０２とをヘ
ッドギャップ１２）のギャップ長と等しい空隙を隔てて
対接させて、炉に入れ酸化防止雰囲気中くて非磁性材（
３）、例えばガラス材を溶融し、その溶融されたガラス
材を各相対する溝（ｌｌｂ）（１２ｂ）との間に注入充
填させ第３図ＢＫ示す如く両コア牛体ブロックａυとａ
りとを互いに機械的に合体させ、接合体ａ・を形成する
。そし【、この接合体Ｑｌの表面側中央部面（１０１）
を残して両肩部を１落しして逃げ面（１０ｂ）　（ＩＯ
Ｃ）を形成する。The core half-dead blocks aυ and 02 formed in this way are placed in contact with each other with a gap equal to the gap length of the head gap 12), and placed in a furnace where a non-magnetic material (
3) For example, by melting a glass material and injecting and filling the molten glass material between each opposing groove (llb) (12b), both core cow body blocks aυ and a are formed as shown in FIG. 3BK.
and are mechanically joined together to form a joined body a. Then, the central surface (101) on the front side of this zygote Ql
Leaving , drop both shoulders by 1 and remove the flank (10b) (IO
C) is formed.

この接合体ａ・の１落しにおいては中央部面（１０ａ）
の幅を前述したテープ摺動画の当り長さｇ１４２　Ｋ対
応して定めることになる。In the first drop of this joined body a, the central part (10a)
The width is determined in accordance with the hit length g142K of the tape sliding motion mentioned above.

次に第３図ＣＫ示すように接合体Ｑ（ｌを前述した非磁
性材充填溝（ｌｌｂ）（１２ｂ）の中心を通る切断−ｍ
ｌ　＠ｍ２　ｅｍｌ・・・・・Ｋ示す藺に沿って切断す
る。この場合、接合体α１はヘッドギャップ長方向に対
して所定角度、所謂アジマス角度をつけた切断！ＩＫ沿
って切断することもできる。Next, as shown in FIG.
l @m2 eml...Cut along the line indicated by K. In this case, the joined body α1 is cut at a predetermined angle, a so-called azimuth angle, with respect to the head gap length direction! It is also possible to cut along the IK.

然る後、第３図ＤＫ示すように切断コア体αＯをヘッド
ベース（図示せず）Ｋ固定した後、テープ摺動画となる
中央部面（１０ｍ’）をならい研磨を行うと共に中央部
面（１０Ｍ’）と１落し逃げ面（１０ｂ’）（１０ｃ’
）との間の角部をアールを付けるように研磨してコア体
ａ４を成形する。After that, as shown in Fig. 3 DK, the cut core body αO is fixed to a head base (not shown) K, and then the central part surface (10 m'), which will be the tape sliding motion, is polished and polished. 10M') and 1 drop flank (10b') (10c'
) to form a core body a4 by polishing the corner part between them to form a radius.

このコア体ａｉに凹＃ｌｌ　ａ３　Ｋよって形成される
巻線用窓孔を通してコイルを巻装するととｋより第１図
に示す本発明による磁気ヘッドが得られる。When a coil is wound around this core body ai through the winding window hole formed by the recess #ll a3 K, a magnetic head according to the present invention shown in FIG. 1 is obtained from k.

尚、以上の磁気ヘッドの構成において、ヘッドギャップ
（２）の深さの規定面となる巻紐用窓孔（５）の上面（
５ａ）の傾斜角度０１とこの窓孔上面（５ｍ）と対向す
るコア表面質の１落し逃げ面、図示めものにおいては、
コア半休（ｌｂ）の１落し面（４ｂ’）の傾斜角度＃意
との関係を＃２≦θｌとすることによりヘッドギャップ
（２）Ｋおける磁束密度が大になり、記Ｑ再生特性が向
上される。In the configuration of the magnetic head described above, the upper surface (
In the case of the inclination angle 01 of 5a) and the relief surface of the core surface material facing the upper surface (5 m) of the window hole, as shown in the figure,
By setting the relationship between the inclination angle # of the 1st falling surface (4b') of the core half-opening (lb) to #2≦θl, the magnetic flux density in the head gap (2) K increases, and the Q reproduction characteristics improve. be done.

以上のよ５に本発明による磁気ヘッドは磁気配置媒体の
摺動画を極力小さくし、特に磁気配置媒体の逃げｌＩＫ
位置するコア半休の磁気記帰媒体に対する当り長を配縁
最長波長の略３倍以下になるように尖１１！［に形成し
たので、テープとの接触圧を増大することができて特に
短波長での良好な出力特性が磁気記帰媒体の走行張力を
下げても得られることになり、４１１ｆｊ！長磁気記鋒
用の配縁効率が高い磁気ヘッドを得ることができる。As described above, the magnetic head according to the present invention minimizes the sliding motion of the magnetic arrangement medium, and in particular,
The tip 11 is set so that the contact length of the located core half-closed to the magnetic recording medium is approximately three times or less than the longest wavelength of the arrangement. [Since the contact pressure with the tape can be increased, good output characteristics especially at short wavelengths can be obtained even if the running tension of the magnetic recording medium is lowered, and 411fj! A magnetic head with high arrangement efficiency for long magnetic recording can be obtained.

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

第１図は本発明による磁気ヘッドの斜視図、第２図は本
発明による磁気ヘッドと従来の磁気ヘッドと対比する特
性図、第３図は本発Ｆ１４による磁気ヘッドの製造工程
図である。 図中（１）は磁気ヘッド、（１ｍ）は磁気配置媒体の進
入側コア半休、（１ｂ）は同、逃げ側コア半休、（２）
はヘッドギャップ、（４ｍ）及び（４ｂ）はコア半休（
１ａ）及び（１ｂ）の摺動面、（４ａ５及び（４ｂ５は
同、１落し面、（５）は巻線用窓孔、（６）はコイル、
ｔ１＊１２は轟り長さである。FIG. 1 is a perspective view of a magnetic head according to the present invention, FIG. 2 is a characteristic diagram comparing the magnetic head according to the present invention with a conventional magnetic head, and FIG. 3 is a manufacturing process diagram of a magnetic head according to the present invention F14. In the figure, (1) is the magnetic head, (1m) is the entrance side core of the magnetic arrangement medium, (1b) is the escape side core, (2)
is the head gap, (4m) and (4b) are the core half-rest (
1a) and (1b) sliding surfaces, (4a5 and (4b5 are the same, 1 falling surface, (5) is a winding window hole, (6) is a coil,
t1*12 is the rumble length.

Claims (1)

【特許請求の範囲】[Claims] コア半体対の関に作動ギャップを設けてなる磁気ヘクト
において、上記コア半休のうち磁気記録媒体の逃げ儒に
位置するコア半休の上記磁気記録媒体に対する当り長さ
が上記磁気記録媒体に記録される信号の配縁最長波長の
略３倍以下になるように形成されてなる尖頭型磁気ヘッ
ド。In a magnetic hect in which an operating gap is provided between a pair of core halves, the contact length of the core half-hole located at the clearance of the magnetic recording medium among the core halves with respect to the magnetic recording medium is recorded on the magnetic recording medium. A pointed magnetic head is formed so that the wavelength is approximately three times or less the longest wavelength of a signal.