JPS6248287B2 - - Google Patents
Info
- Publication number
- JPS6248287B2 JPS6248287B2 JP53091445A JP9144578A JPS6248287B2 JP S6248287 B2 JPS6248287 B2 JP S6248287B2 JP 53091445 A JP53091445 A JP 53091445A JP 9144578 A JP9144578 A JP 9144578A JP S6248287 B2 JPS6248287 B2 JP S6248287B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic flux
- gap
- flux density
- head
- magnetic
- 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
Links
Description
【発明の詳細な説明】
本発明は高Hcの磁気テープを消去するための
複合型消去ヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hybrid erase head for erasing high Hc magnetic tape.
消去ヘツドは、ギヤツプの構成からシングルギ
ヤツプ、セミダブルギヤツプ、ダブルギヤツプの
３種類に大別される。 Erasing heads are roughly classified into three types based on the configuration of the gap: single gap, semi-double gap, and double gap.
従来、一般に消去ヘツドのコアー材料としてフ
エライトが用いられており、セミダブルギヤツプ
のヘツドにおいてその構造として第１図に示され
るような磁気回路が知られている。すなわち第１
図において、閉磁路の磁気コアー１のギヤツプ中
央に磁心片２を挿入して２つのギヤツプを設けた
構成である。 Conventionally, ferrite has generally been used as the core material of the erase head, and a magnetic circuit as shown in FIG. 1 is known as a structure for a semi-double gap head. That is, the first
In the figure, a magnetic core piece 2 is inserted into the center of the gap of a magnetic core 1 in a closed magnetic circuit to provide two gaps.
しかし、磁気テープのHcが1000Oe程度のもの
になると第１図に示される構造のものでは十分な
消去が望めなく、そこで第２図に示されるような
後部磁気コアー１にフエライト、前部磁気コアー
１１にセンダストのような高磁束密度材料を用い
た複合型の消去ヘツドが提案されている。しかし
ながら、このような構造では、その製法が複雑で
あり、コストが高くつく欠点があつた。 However, when the Hc of the magnetic tape becomes about 1000 Oe, sufficient erasing cannot be expected with the structure shown in Figure 1, so the structure shown in Figure 2 is constructed using ferrite for the rear magnetic core 1 and ferrite for the front magnetic core. A composite erase head using a high magnetic flux density material such as Sendust has been proposed in No. 11. However, such a structure has the disadvantage that the manufacturing method is complicated and the cost is high.
そこで本発明は、高Hc磁気テープであつても
十分な消去が出来ると共に、製法の簡単な消去ヘ
ツドを提供しようとするものであり、セミダブル
ギヤツプ複合型に着目したものである。 Therefore, the present invention aims to provide an erasing head that can perform sufficient erasing even on high Hc magnetic tapes and is simple to manufacture, and focuses on the semi-double gap composite type.
以下、本発明を第３図ないし第６図に示す実施
例に基づいて説明する。 The present invention will be explained below based on the embodiments shown in FIGS. 3 to 6.
第２図，第３図は本発明の異なる実施例を示す
もので、図において、高い固有抵抗材料から構成
され、左右一対のコ形又はＬ形状の磁気コアー１
と、２つの空隙を有し、磁気テープ摺動面と直角
の方向に対して中心の１枚が他の２枚より短かい
３枚の高磁束密度材料２，２１よりなるギヤツプ
部の形成チツプとで構成されている。 2 and 3 show different embodiments of the present invention. In the figure, a pair of left and right U-shaped or L-shaped magnetic cores 1 are made of a high resistivity material.
and a chip for forming a gap portion, which is made of three high magnetic flux density materials 2 and 21, each having two air gaps and the central one being shorter than the other two in the direction perpendicular to the magnetic tape sliding surface. It is made up of.
磁気コアー１には固有抵抗の非常に大きいフエ
ライトを、ギヤツプ部の形成チツプである高磁束
密度材料としてはパーマロイ、アルパーム、セン
ダストなどがあるが、このうち磁束密度が高く、
耐摩耗性のよいセンダストを用いるのが好まし
い。 The magnetic core 1 is made of ferrite, which has a very high specific resistance, and the high magnetic flux density materials that form the gap part include permalloy, alperm, and sendust, among which the magnetic flux density is high.
It is preferable to use Sendust, which has good wear resistance.
このような構造にすることによつて、ギヤツプ
部の形成チツプを構成する高磁束密度材料の中心
の１枚が他より短かくなつているので、第５図に
示す如く、ギヤツプ部で磁束が集束されギヤツプ
中の磁界は、ギヤツプ部の形成チツプの飽和磁束
密度まで高めることができ、第２図に示す従来例
の複合型消去ヘツドと同一な効果を得ることがで
きる。 With this structure, one of the central pieces of the high magnetic flux density material constituting the gap forming chip is shorter than the others, so the magnetic flux at the gap is reduced as shown in Figure 5. The focused magnetic field in the gap can be increased to the saturation magnetic flux density of the chip forming the gap, and the same effect as the conventional composite erase head shown in FIG. 2 can be obtained.
本発明の構造に係るギヤツプ部の製法は第６図
に示すように、３枚の高磁束密度材料２１，２，
２１を空隙形成スペーサ３を介して接着固定した
後、所要トラツク幅に切り出し、磁気コアー１の
ギヤツプ形成部分にはさみ接着固化するというき
わめて簡単な方法で行い得る。したがつて本発明
の構造によれば、第２図に示した従来の複合型ヘ
ツドに比べて、はるかに簡単であり、安価に消去
効果の高いヘツドを提供できる。 The manufacturing method of the gap part according to the structure of the present invention is as shown in FIG.
21 is adhesively fixed via the gap-forming spacer 3, cut out to the required track width, and then sandwiched between the gap-forming portion of the magnetic core 1 and adhesively solidified. Therefore, the structure of the present invention is much simpler than the conventional composite head shown in FIG. 2, and can provide a head with a high erasing effect at low cost.
従来の消去ヘツド（第１図）と本発明の消去ヘ
ツドとの消去電流に対する消去特性を第７図に示
す。測定条件は高磁束密度材料（センダスト）
２，２１が300μ、磁気ギヤツプが共に50μと
し、グラフA1，A2が従来の消去ヘツド（それぞ
れ＋26dB入力録音、＋10dB入力録音）、グラフＢ
が本発明の消去ヘツド（＋26dB入力録音）であ
る。これによると、全く同一条件で測定したグラ
フA1とグラフＢとの比較において、グラフA1は
52dBの消去率に対し、本発明に係るグラフＢは
70dB以上の消去率を有することが認められる。 FIG. 7 shows the erase characteristics with respect to erase current of the conventional erase head (FIG. 1) and the erase head of the present invention. Measurement conditions are high magnetic flux density material (Sendust)
2 and 21 are 300μ, and both magnetic gaps are 50μ. Graphs A 1 and A 2 are conventional erase heads (+26 dB input recording and +10 dB input recording, respectively), and graph B
is the erasure head (+26 dB input recording) of the present invention. According to this, when comparing graph A 1 and graph B measured under exactly the same conditions, graph A 1 is
For an erasure rate of 52 dB, graph B according to the present invention is
It is recognized that it has an erasure rate of 70dB or more.
第１図，第２図は従来のセミダブル型消去ヘツ
ドの構造を示し、第３図，第４図は本発明の異な
る構造を示す実施例であり、第５図は本発明に係
る構造のギヤツプ部付近の磁束分布を示す図、第
６図は本発明のギヤツプ部の構成を示す図、第７
図は従来の消去ヘツドと本発明の消去ヘツドの消
去特性を示すグラフである。
１……磁気コアー、２，２１……高磁束密度材
料。
1 and 2 show the structure of a conventional semi-double erase head, FIGS. 3 and 4 show embodiments showing different structures of the present invention, and FIG. 5 shows a gap structure of the structure according to the present invention. Fig. 6 is a diagram showing the configuration of the gap part of the present invention, Fig. 7 is a diagram showing the configuration of the gap part of the present invention.
The figure is a graph showing the erasing characteristics of the conventional erasing head and the erasing head of the present invention. 1... Magnetic core, 2, 21... High magnetic flux density material.
Claims (1)
い、ギヤツプ部に高磁束密度材料を用いたセミダ
ブルギヤツプ複合型消去ヘツドにおいて、上記磁
気コアーのギヤツプ部対向面に各々同じ大きさの
高磁束密度材料を取付けると共にこの２枚の左右
高磁束密度材料の対向面にギヤツプ部を介して、
左右高磁束密度材料よりも磁気テープ摺動面と直
角の方向に対し短かい中央高磁束密度材料を挾持
して成る消去ヘツド。1. In a semi-double gap composite erase head in which the magnetic core is made of a magnetic material with high specific resistance and the gap part is made of a high magnetic flux density material, high magnetic flux densities of the same size are applied to the opposite surfaces of the gap part of the magnetic core. At the same time as attaching the material, attach it to the opposing surfaces of these two left and right high magnetic flux density materials through the gap part.
An erasing head comprising a central high magnetic flux density material that is shorter in the direction perpendicular to the magnetic tape sliding surface than the left and right high magnetic flux density materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9144578A JPS5522205A (en) | 1978-07-28 | 1978-07-28 | Erase head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9144578A JPS5522205A (en) | 1978-07-28 | 1978-07-28 | Erase head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5522205A JPS5522205A (en) | 1980-02-16 |
| JPS6248287B2 true JPS6248287B2 (en) | 1987-10-13 |
Family
ID=14026559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9144578A Granted JPS5522205A (en) | 1978-07-28 | 1978-07-28 | Erase head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5522205A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS547318A (en) * | 1977-06-17 | 1979-01-20 | Canon Inc | Erase head |
-
1978
- 1978-07-28 JP JP9144578A patent/JPS5522205A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5522205A (en) | 1980-02-16 |
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