JPH0629769Y2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH0629769Y2 JPH0629769Y2 JP1985000651U JP65185U JPH0629769Y2 JP H0629769 Y2 JPH0629769 Y2 JP H0629769Y2 JP 1985000651 U JP1985000651 U JP 1985000651U JP 65185 U JP65185 U JP 65185U JP H0629769 Y2 JPH0629769 Y2 JP H0629769Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- ferrite
- magnetic
- mol
- ratio
- 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
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Description
【考案の詳細な説明】 (イ)産業上の利用分野 本考案はVTR(ビデオテープレコーダ)用の磁気ヘッ
ドに関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a magnetic head for a VTR (video tape recorder).
(ロ)従来技術 8ミリビデオと称されるVTRでは抗磁力の高い(14
00〜1500エルステッド)メタルテープの使用が提
案されている。これはVTRを小型化するために記録密
度を高める必要から信号の記録波長を短かくすることが
できる記録媒体が要求されるためである。(B) Conventional technology A VTR called 8 mm video has high coercive force (14
The use of (00-1500 Oersted) metal tape has been proposed. This is because a recording medium capable of shortening the signal recording wavelength is required because it is necessary to increase the recording density in order to downsize the VTR.
一方、これに対する磁気ヘッドとしては従来のフェライ
トヘッドでは飽和磁化が小さいため磁気飽和現象が発生
しメタルテープの性能を充分に生かすことができない。
そこで磁気飽和現象の最も生じ易い作動ギャップ近傍部
分をフェライトよりも飽和磁化の大きな磁性材料、例え
ばパーマロイ、センダスト、アモルファス等で形成し、
その他の部分をフェライトで形成した複合型の磁気ヘッ
ドが提案されている。特開昭58−175122号公報
もこのような磁気ヘッドを対象としている。On the other hand, as a magnetic head for this, a conventional ferrite head has a small saturation magnetization, so that a magnetic saturation phenomenon occurs and the performance of the metal tape cannot be fully utilized.
Therefore, the part near the operating gap where the magnetic saturation phenomenon is most likely to occur is formed of a magnetic material having a larger saturation magnetization than ferrite, such as permalloy, sendust, or amorphous,
A composite magnetic head in which the other portion is formed of ferrite has been proposed. Japanese Patent Laid-Open No. 58-175122 also targets such a magnetic head.
(ハ)考案が解決しようとする問題点 ところが、上述のような複合型磁気ヘッドはS/N比がセ
ンダストヘッドやアモルファスヘッドに比べて劣るとい
う問題点を有する。例えばセンダストヘッドに比べて2
〜3dB劣る。この原因の1つとしてフェライト特有の
摺動ノイズが挙げられる。これはテープに摺動したとき
の磁歪現象によって生じると考えられているが、その磁
歪定数はフェライト組成を函数として変わり、特にFe
成分が多くなると大きくなる(ノイズも大きくなる)。
しかるに前記の複合型の磁気ヘッドではFe2O3がフェラ
イトを構成する全組成の52〜57モル%と比較的大き
く選ばれていたので摺動ノイズが多くS/N比が悪かっ
た。(C) Problems to be solved by the invention However, the composite magnetic head as described above has a problem that the S / N ratio is inferior to that of the sendust head or the amorphous head. 2 compared to sendust head, for example
~ 3 dB inferior. One of the causes is sliding noise peculiar to ferrite. It is believed that this is caused by the magnetostriction phenomenon when sliding on the tape, but its magnetostriction constant changes as a function of the ferrite composition, especially Fe
The larger the number of components, the larger (noise also increases).
However, in the above composite type magnetic head, Fe 2 O 3 was selected relatively large as 52 to 57 mol% of the total composition of the ferrite, so that sliding noise was large and the S / N ratio was poor.
(ニ)問題点を解決するための手段 作動ギャップを介して相対峙する2個のフェライトコア
の各作動ギャップ形成面側に該コア材よりも飽和磁束密
度の大きい金属磁性材を結合してなる磁気ヘッドにおい
て、Fe2O3の占める割合が45〜50モル%のMn−Z
nフェライト単結晶を前記コア材として用いた構成。(D) Means for solving the problem A metallic magnetic material having a saturation magnetic flux density higher than that of the core material is coupled to each of the operation gap forming surfaces of two ferrite cores that face each other through the operation gap. In the magnetic head, Fe 2 O 3 accounts for 45 to 50 mol% of Mn-Z.
A structure using an n-ferrite single crystal as the core material.
(ホ)作用 Fe2O3が50モル%以下と従来に比し少くなったので、
その分、磁歪定数が小さくなり、摺動ノイズが少ない。
また45モル%を下がらない値に選ぶので、飽和磁化が
極端に小さくならず記録性能が劣化しない。(E) Action Fe 2 O 3 is 50 mol% or less, which is smaller than that of the conventional one.
As a result, the magnetostriction constant becomes smaller and sliding noise is reduced.
Since 45 mol% is selected so as not to decrease, the saturation magnetization does not become extremely small and the recording performance does not deteriorate.
(ヘ)実施例 図において、(1a)(1b)は作動ギャップ(2)を介
して相対峙する2個のフェライトコアであり、(3a)
(3d)は前記フェライトコアの各作動ギャップ形成面
側に配されたセンダスト材、(4)はトラック幅を規定す
るように配されたガラス、(5)は巻線孔である。斯る磁
気ヘッドの構成要素のうち、前記フェライトコア(1
a)(1b)に用いるMn−Znフェライト単結晶の組
成比と磁気ヘッドのS/N比との関係を知るために第4図
に示すような各種組成比のフェライト試料を用いて第1
図に示す磁気ヘッドを作成し、そのS/N比を1KHz〜
4.2MHzの周波数範囲で測定した。尚、第4図の試料
A…Fにおいて、組成にバラツキがあるのは単結晶育成
時の偏析による。これらの試料を用いて作成した磁気ヘ
ッドについて再生時のS/N比を測定した結果は第5図に
示す通りである。(F) Example In the figure, (1a) and (1b) are two ferrite cores that face each other through the working gap (2), and (3a)
(3d) is a sendust material arranged on the side of each operation gap forming surface of the ferrite core, (4) is glass arranged so as to define the track width, and (5) is a winding hole. Among the components of such a magnetic head, the ferrite core (1
a) In order to know the relationship between the composition ratio of the Mn-Zn ferrite single crystal used in (1b) and the S / N ratio of the magnetic head, ferrite samples of various composition ratios as shown in FIG. 4 were used.
The magnetic head shown in the figure was created and its S / N ratio was set to 1 kHz
It was measured in the frequency range of 4.2 MHz. Incidentally, in Samples A ... F of FIG. 4, the variation in composition is due to segregation during single crystal growth. The results of measuring the S / N ratio during reproduction of the magnetic heads prepared using these samples are shown in FIG.
第4図、第5図から分るようにFe2O3の成分比が53モ
ル%及び56モル%では、ノイズが多く、S/N比はかな
り悪い。Fe2O3が60モル%になるとノイズは少なくな
るが、再生出力も低下するためS/N比としては多少良く
なる程度である。これに対してFe2O3が50モル%以下
になるとZnOの量にあまり関係なくS/N比は良好にな
る。ただし、45モル%よりも少なくなると飽和磁化が
小さくなってメタルテープのような高抗磁力テープへの
記録性能が劣化するのでFe2O3組成を45〜50モル%
の範囲にすることでS/N比が良好で且つ記録性能が損な
われない複合型の磁気ヘッドを実現することができる。As can be seen from FIGS. 4 and 5, when the Fe 2 O 3 component ratio is 53 mol% and 56 mol%, there is much noise and the S / N ratio is considerably poor. When Fe 2 O 3 content is 60 mol%, the noise is reduced, but the reproduction output is also reduced, so that the S / N ratio is somewhat improved. On the other hand, when Fe 2 O 3 is 50 mol% or less, the S / N ratio becomes good regardless of the amount of ZnO. However, the Fe 2 O 3 composition since the saturation magnetization is less than 45 mol% becomes the recording performance of the high coercivity tapes of metal tape is deteriorated less 45-50 mole%
Within the range, it is possible to realize a composite type magnetic head which has a good S / N ratio and does not impair recording performance.
上述において、センダスト材(3a)(3b)の代りに
アモルファス材若しくはその他の飽和磁束密度の大きい
金属磁性材を用いてもよい。In the above description, instead of the sendust materials (3a) and (3b), an amorphous material or other metallic magnetic material having a high saturation magnetic flux density may be used.
(ヘ)考案の効果 本考案によればS/Nが良好な複合型の磁気ヘッドを実現
することができ、有効である。(F) Effect of the invention According to the invention, a composite type magnetic head having a good S / N can be realized, which is effective.
図面はいずれも本考案の磁気ヘッドに関するものであっ
て、第1図は斜視図、第2図はそのX−X′線断面図、
第3図は要部拡大図、第4図及び第5図は構成及び効果
について説明する図である。 (1a)(1b)……フェライトコア、(2)……作動ギ
ャップ、(3a)(3b)……センダスト材(金属磁性
材)。The drawings are all related to the magnetic head of the present invention. FIG. 1 is a perspective view, FIG. 2 is a sectional view taken along line XX 'of FIG.
FIG. 3 is an enlarged view of a main part, and FIGS. 4 and 5 are views for explaining the configuration and effects. (1a) (1b) ... ferrite core, (2) ... operating gap, (3a) (3b) ... sendust material (metal magnetic material).
───────────────────────────────────────────────────── フロントページの続き (72)考案者 石原 宏三 大阪府守口市京阪本通2丁目18番地 三洋 電機株式会社内 (56)参考文献 特開 昭56−41519(JP,A) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kozo Ishihara 2-18, Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (56) References JP-A-56-41519 (JP, A)
Claims (1)
ェライトコアの各作動ギャップ形成面側に、該コア材よ
りも飽和磁束密度の大きい金属磁性材を結合してなる磁
気ヘッドにおいて、前記コア材をFe2O3の占める割合が
45〜50モル%のMn−Znフェライト単結晶とした
ことを特徴とする磁気ヘッド。1. A magnetic head in which a metallic magnetic material having a saturation magnetic flux density higher than that of the core material is coupled to the respective operation gap forming surfaces of two ferrite cores which face each other through an operating gap. A magnetic head characterized in that the core material is Mn-Zn ferrite single crystal in which the proportion of Fe 2 O 3 is 45 to 50 mol%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1985000651U JPH0629769Y2 (en) | 1985-01-08 | 1985-01-08 | Magnetic head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1985000651U JPH0629769Y2 (en) | 1985-01-08 | 1985-01-08 | Magnetic head |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61118105U JPS61118105U (en) | 1986-07-25 |
JPH0629769Y2 true JPH0629769Y2 (en) | 1994-08-10 |
Family
ID=30472684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1985000651U Expired - Lifetime JPH0629769Y2 (en) | 1985-01-08 | 1985-01-08 | Magnetic head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0629769Y2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2521922B2 (en) * | 1986-09-03 | 1996-08-07 | ソニー株式会社 | Magnetic head |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5641519A (en) * | 1979-09-13 | 1981-04-18 | Hitachi Ltd | Magnetic head |
-
1985
- 1985-01-08 JP JP1985000651U patent/JPH0629769Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS61118105U (en) | 1986-07-25 |
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