JPS6249645B2 - - Google Patents
Info
- Publication number
- JPS6249645B2 JPS6249645B2 JP53087179A JP8717978A JPS6249645B2 JP S6249645 B2 JPS6249645 B2 JP S6249645B2 JP 53087179 A JP53087179 A JP 53087179A JP 8717978 A JP8717978 A JP 8717978A JP S6249645 B2 JPS6249645 B2 JP S6249645B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- head
- 5mhz
- permeability
- yield
- 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
- 230000035699 permeability Effects 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 11
- 239000000758 substrate Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- G11B5/133—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)
- Soft Magnetic Materials (AREA)
Description
本発明はビデオテープレコーダなどの記録再生
に使用するビデオヘツドの材料に関するものであ
る。
従来ビデオヘツドとして、たとえば、Fe2O3が
50、MnOが30、ZnOが20の重量百分率の配合か
ら成るMn―Znフエライト単結晶基板を用いるこ
とが知られている。このようなMn―Znフエライ
ト単結晶基板から切り出して磁気ヘツドコアを作
成し、磁気ヘツドを組立てた場合、ヘツドの性能
のばらつきが大きく、歩留りが小さいという問題
があつた。歩留を向上させるために、フエライト
基板から数十個分のヘツドチツプに相当する大き
さのブロツクを切出した状態であるパラメータを
測定して選別することが考えられるがどのような
パラメータをどの程度の値で選べば良いかは明確
にされていない。
本発明の目的は上記の点に鑑みてなされたもの
であり、性能が向上し、歩留の良い磁気ヘツドの
材料を提供することにある。
本発明は、たとえばFe2O3：MnO：ZnOを50：
30：20の配合比とした原料をいわゆるブリツジマ
ン炉で育成したMn―Znフエライト単結晶のイン
ゴツトが、長手方向に組成が少しづつ変化し、そ
れに応じて磁気特性も少しづつ変化していること
に着目し、インゴツトの先端から後端に向つて順
次基板を切り出し採取し、この各基板の磁気特性
と、それらの基板から作成した磁気ヘツドの特性
とを測定して、望ましい特性の磁気ヘツドが得ら
れる磁気特性の範囲を決定したものである。
以下実施例により本発明を説明する。
Fe2O3、MnO、ZnOをそれぞれ重量百分率で
50、30、20の割合で配合した材料から作成した
Mn―Znフイライト単結晶のインゴツト数本から
各部の基板を切り出し、各種特性の測定とヘツド
作成後の性能測定とを行なつた。ヘツドはトラツ
ク幅が60μｍ、ギヤツプ長0.5μｍ、ギヤツプ深
さ60μｍのチツプに巻線を15ターン施したものと
し、標準テープの再生により4.1MHzにおいて出
力電圧が0.23mV以上得られる歩留りを測定し
た。材料の各種パラメータの測定結果のうち、
5MHzにおける透磁率、0.5MHzと5MHzの透磁率の
比、5MHzにおけるtanδ、外部磁場が10Oeのと
きの磁束密度B10、保磁力Hc、電気抵抗ρの各値
と0.23mV以上が得られる歩留との関係を表に示
す。なお、この表に示した試料はすべてキユーリ
ー温度は150〜220℃、0.5MHzにおけるtanδ
The present invention relates to a material for a video head used for recording and reproduction in video tape recorders and the like. Conventionally, for example, Fe 2 O 3 was used as a video head.
It is known to use an Mn--Zn ferrite single crystal substrate having a weight percentage of 50% MnO, 30% MnO, and 20% ZnO. When a magnetic head core is cut out from such an Mn--Zn ferrite single crystal substrate and a magnetic head is assembled, there is a problem that the performance of the head varies widely and the yield is low. In order to improve the yield, it is conceivable to measure and select parameters while cutting blocks of a size equivalent to several dozen head chips from a ferrite substrate. It is not clear whether you should choose based on value. The object of the present invention has been made in view of the above points, and it is an object of the present invention to provide a material for a magnetic head with improved performance and good yield. In the present invention, for example, Fe 2 O 3 :MnO:ZnO is 50:
The composition of Mn-Zn ferrite single crystal ingots grown in a so-called Bridgeman furnace using raw materials with a mixing ratio of 30:20 changes little by little in the longitudinal direction, and the magnetic properties also change little by little accordingly. Focusing on this, we sequentially cut out and collect the substrates from the tip to the back of the ingot, and measured the magnetic properties of each substrate and the characteristics of the magnetic head made from these substrates to obtain a magnetic head with the desired characteristics. The range of magnetic properties that can be achieved is determined. The present invention will be explained below with reference to Examples. Fe 2 O 3 , MnO, ZnO each in weight percentage
Made from materials mixed at a ratio of 50, 30, and 20
Various parts of the substrate were cut out from several Mn--Zn filite single crystal ingots, and various characteristics were measured and performance was measured after the head was made. The head was made of a chip with a track width of 60 μm, a gap length of 0.5 μm, and a gap depth of 60 μm, with 15 turns of winding applied thereto, and the yield at which an output voltage of 0.23 mV or more could be obtained at 4.1 MHz by playing back a standard tape was measured. Among the measurement results of various parameters of the material,
Magnetic permeability at 5MHz, ratio of magnetic permeability between 0.5MHz and 5MHz, tan δ at 5MHz, magnetic flux density B 10 when the external magnetic field is 10Oe, coercive force Hc, electrical resistance ρ, and the yield at which 0.23mV or more can be obtained. The relationship with is shown in the table. All samples shown in this table have a Curie temperature of 150 to 220℃ and tanδ at 0.5MHz.
【表】
は1.5以下であつた。これらの測定結果のうち、
0.5MHzの透磁率と5MHzの透磁率との比とヘツド
出力の歩留りの関係を第１図に、5MHzにおける
透磁率とヘツド出力歩留りとの関係を第２図に示
す。これらの図中番号は表に示した試料の番号に
相当する。
この結果から、ヘツド出力の歩留りが70％以上
得るには、B10が4600〜5200G、Hcが0.01〜
0.04Oe、ρが0.22〜0.24Ω・cm、キユーリー温度
が150〜220℃で、しかも0.5MHzと5MHzの透磁率
の比が3.5以下、5MHzにおける透磁率が400以上
の材料基板を用いれば良いことが分る。
このような磁気特性の範囲にある材料基板であ
れば、Mn―Znフエライトの原料配合比はFe2O3
が50、MnOが30、ZnOが20の比に限らず他の配
合比でも良いこと、および単結晶に限らず多結晶
の材料でも良いことが実験により確かめられた。
以上述べたようにこのような条件の材料でヘツ
ドを作成すれば、歩留りが高くなるため、ヘツド
の性能が向上するばかりでなく、無駄なヘツドチ
ツプの加工が少なくなるため、コストが低減し、
量産性が向上するなど多くの利点がある。[Table] was 1.5 or less. Of these measurement results,
Figure 1 shows the relationship between the ratio of magnetic permeability at 0.5MHz and 5MHz and the yield of head output, and Figure 2 shows the relationship between magnetic permeability at 5MHz and head output yield. The numbers in these figures correspond to the sample numbers shown in the table. From this result, in order to obtain a head output yield of 70% or more, B10 must be 4600 to 5200G, and Hc must be 0.01 to 5200G.
It is sufficient to use a material substrate of 0.04Oe, ρ of 0.22 to 0.24Ω・cm, Curie temperature of 150 to 220℃, and the ratio of magnetic permeability between 0.5MHz and 5MHz of 3.5 or less, and magnetic permeability of 400 or more at 5MHz. I understand. If the material substrate has magnetic properties within this range, the raw material mixing ratio of Mn-Zn ferrite is Fe 2 O 3
It was confirmed through experiments that the ratio is not limited to 50 for MnO, 30 for MnO, and 20 for ZnO, but that other compounding ratios may be used, and that polycrystalline materials may be used instead of single crystal materials. As mentioned above, if heads are made from materials that meet these conditions, the yield will be higher, which not only improves head performance, but also reduces costs by reducing wasteful head chip processing.
There are many advantages such as improved mass productivity.
第１図はフエライト材料の0.5MHzと5MHzの透
磁率の比と、ヘツド出力歩留りの関係を示した分
布図、第２図はフエライト材料の5MHzの透磁率
とヘツド出力歩留りの関係を示した分布図であ
る。
Figure 1 is a distribution diagram showing the relationship between the ratio of 0.5MHz and 5MHz magnetic permeability of ferrite material and head output yield, and Figure 2 is a distribution diagram showing the relationship between 5MHz magnetic permeability of ferrite material and head output yield. It is a diagram.
Claims (1)
下、キユーリー温度が150℃以上、外部磁場10Oe
のときの磁束密度が4300G以上、保磁力が0.04Oe
以下、電気抵抗が0.2Ω・cm以上、5MHzにおける
透磁率が400以上の各条件を有するMn―Zn単結
晶フエライトの大きいブロツクより小ブロツクに
分割し、この小ブロツクを加工して得られる磁気
ヘツドにおいて、0.5MHzにおける透磁率と、5M
Hzにおける透磁率との比が3.5以下となる小ブロ
ツクから加工したことを特徴とする磁気ヘツド。1 tanδ at 0.5MHz and 5MHz is 1.5 or less, Curie temperature is 150℃ or more, external magnetic field is 10Oe
When the magnetic flux density is 4300G or more, the coercive force is 0.04Oe
Below, a large block of Mn--Zn single-crystal ferrite having electrical resistance of 0.2 Ω cm or more and magnetic permeability of 400 or more at 5 MHz is divided into smaller blocks, and the magnetic head obtained by processing these small blocks is described below. , permeability at 0.5MHz and 5M
A magnetic head characterized in that it is fabricated from small blocks whose ratio to magnetic permeability at Hz is 3.5 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8717978A JPS5514544A (en) | 1978-07-19 | 1978-07-19 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8717978A JPS5514544A (en) | 1978-07-19 | 1978-07-19 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5514544A JPS5514544A (en) | 1980-02-01 |
| JPS6249645B2 true JPS6249645B2 (en) | 1987-10-20 |
Family
ID=13907753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8717978A Granted JPS5514544A (en) | 1978-07-19 | 1978-07-19 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5514544A (en) |
-
1978
- 1978-07-19 JP JP8717978A patent/JPS5514544A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5514544A (en) | 1980-02-01 |
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