JPH0231307A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH0231307A JPH0231307A JP18240788A JP18240788A JPH0231307A JP H0231307 A JPH0231307 A JP H0231307A JP 18240788 A JP18240788 A JP 18240788A JP 18240788 A JP18240788 A JP 18240788A JP H0231307 A JPH0231307 A JP H0231307A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic flux
- recording
- constant
- magnetic 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.)
- Pending
Links
- 230000004907 flux Effects 0.000 abstract description 21
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 7
- 239000000919 ceramic Substances 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 21
- 230000035699 permeability Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000696 magnetic material Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁気記録装置の磁気ヘッドに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic head for a magnetic recording device.
従来の磁気ヘッドの一例を第６図に示す。この磁気ヘッ
ドは、フェライトよりなるエコア４、Ｌコア５、バック
コア３により構成されており、ギャップ１を持つ、この
例では、記録と再生が同一の磁気ヘッドにより行われる
。巻線６に記録電流を流すことによりギャップ１に磁界
が生じ記録が行われる。又、再生時には、ギャップ１に
より検出された記録媒体の磁束が巻線６に電圧を用しる
。An example of a conventional magnetic head is shown in FIG. This magnetic head is composed of an echo core 4, an L core 5, and a back core 3 made of ferrite, and has a gap 1. In this example, recording and reproduction are performed by the same magnetic head. By passing a recording current through the winding 6, a magnetic field is generated in the gap 1, and recording is performed. Further, during reproduction, the magnetic flux of the recording medium detected through the gap 1 applies a voltage to the winding 6.
ところがこのような構成の磁気へセドでは、第７図の従
来の磁気ヘッドにおける記録電流と出力電圧の関係図よ
り明らかなように、記録電流が図中の実使用電流値に定
電流化されていても、温度変化により出力電圧がおおき
く変動してしまい、ひいては、記録装置としてもその性
能におおきな温度依存性をもつという課題があった。However, in a magnetic hesedo with such a configuration, as is clear from the relationship diagram of the recording current and output voltage in a conventional magnetic head shown in Figure 7, the recording current is not kept constant at the actual current value shown in the diagram. However, there is a problem in that the output voltage fluctuates significantly due to temperature changes, and the performance of the recording device also has a large temperature dependence.
そこで、本発明はこのような課題を解決するものでその
目的とするところは、温度依存性の少ない磁気ヘッドを
提供することにある。SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and an object of the present invention is to provide a magnetic head with less temperature dependence.
本発明の磁気ヘッドは、磁気記録装置に使用される磁気
ヘッドにおいて、磁気回路の一部に、磁気飽和の生じや
すい部分を含むことを特徴とする。The magnetic head of the present invention is a magnetic head used in a magnetic recording device, and is characterized in that a portion of the magnetic circuit includes a portion where magnetic saturation is likely to occur.
第１図は、本発明の一実施例の概要図である。 FIG. 1 is a schematic diagram of an embodiment of the present invention.
この磁気ヘッドは、フェライトよりなるエコア４、Ｌコ
ア５とフェライトと非磁性セラミクスの焼結体よりなる
実効的に飽和磁束密度の低いバックコア２及びギャップ
部１よりなる。This magnetic head consists of an echo core 4 and an L core 5 made of ferrite, a back core 2 made of a sintered body of ferrite and nonmagnetic ceramics and having an effectively low saturation magnetic flux density, and a gap portion 1.
実施例の説明に先たち、出力電圧の温度依存性の生じる
原因を概説する。Before explaining the embodiments, the causes of the temperature dependence of the output voltage will be outlined.
本実施例に使用されているフェライトに代表されるよう
な磁気ヘッドに使用される軟磁性材料は透磁率が大きな
値をもつことが必要であるため、そのキューリー点が常
温より少し高い材料が使用される。フェライトの場合は
百数十℃である。ところが一般に透磁率はキャリー点付
近では大きな温度依存性をもち低温からキャリー点に近
づくに従って増大する。このような、透磁率の温度依存
性の大きな材料よりなる磁気ヘッドでは、記録時にヘッ
ドにかける起磁力を一定としても、ギャップに生じる記
録磁界は、温度が上昇すると透磁率の増大により磁気回
路の磁気抵抗が減るため、大きくなってしまう。これが
、出力電圧の温度依存性の原因である。この対策として
は、ギャップに生じる書込磁界を温度によらず一定にす
ればよい。The soft magnetic material used in the magnetic head, such as the ferrite used in this example, must have a large magnetic permeability, so a material whose Curie point is slightly higher than room temperature is used. be done. In the case of ferrite, the temperature is over 100 degrees Celsius. However, in general, magnetic permeability has a large temperature dependence near the carry point and increases as the temperature approaches the carry point. In such a magnetic head made of a material whose magnetic permeability is highly dependent on temperature, even if the magnetomotive force applied to the head during recording is constant, the recording magnetic field generated in the gap will change due to the increase in magnetic permeability as the temperature rises. It becomes larger because the magnetic resistance decreases. This is the cause of the temperature dependence of the output voltage. As a countermeasure against this problem, it is sufficient to make the write magnetic field generated in the gap constant regardless of the temperature.
さて、本実施例では、バックコア２は飽和磁束密度が小
さいため、第２図の本発明の一実施例を説明するための
記録起磁力と磁気回路内の磁束の関係図に示すようにあ
る程度以上の記録起磁力をかければ磁束はφＳで一定と
なる。尚、φＳはバックコアの飽和磁束に等しい。又、
記録起磁力は、記録電流と巻数の積である。第３図の、
本発明の一実施例における記録電流と出力電圧の関係図
に示すように、磁束がφＳで一定となることを反映し、
出力電圧は、ある記録電流この例では１０ｍＡｐｐ以上
で温度にも記録電流にもよらず一定となる。Now, in this embodiment, since the back core 2 has a small saturation magnetic flux density, the saturation magnetic flux density is small to a certain extent as shown in the relationship diagram between the recording magnetomotive force and the magnetic flux in the magnetic circuit shown in FIG. 2 for explaining one embodiment of the present invention. If the above recording magnetomotive force is applied, the magnetic flux becomes constant at φS. Note that φS is equal to the saturation magnetic flux of the back core. or,
The recording magnetomotive force is the product of the recording current and the number of turns. In Figure 3,
As shown in the relationship diagram between recording current and output voltage in one embodiment of the present invention, reflecting the fact that the magnetic flux is constant at φS,
The output voltage remains constant regardless of temperature or recording current at a certain recording current, in this example, 10 mApp or more.
第４図は、本発明の他の実施例の概要図である。FIG. 4 is a schematic diagram of another embodiment of the invention.
この実施例では、バックコアがないので、飽和磁束密度
の低い部材をふたつのコアの間にはさんでいる。In this embodiment, since there is no back core, a member with a low saturation magnetic flux density is sandwiched between the two cores.
第５図は、本発明のもうひとつの実施例の概要図である
。本実施例では、磁気回路の一部に、断面積を小さくし
た部分８を設けることで磁気飽和が生じるようにしてい
る。FIG. 5 is a schematic diagram of another embodiment of the invention. In this embodiment, magnetic saturation is caused by providing a portion 8 with a reduced cross-sectional area in a part of the magnetic circuit.
尚、出力電圧について説明したが、他の特性についても
温度依存性は改善する。Note that although the output voltage has been explained, the temperature dependence of other characteristics is also improved.
以上述べたように本発明によれば、磁気ヘッドの一部に
磁気飽和の生じやすい部分を設けて、記録時には、この
部分で磁気飽和を生じさせることにより磁気回路を定磁
束化する即ち実質的に磁気飽和の生じやすい部分の飽和
磁束の値により、磁気回路に流れる磁束を一定とし、ギ
ャップに生じる記録磁界を温度などによらず一定とする
ことにより、磁気ヘッドの出力電圧の温度存依性をなく
することができるという効果を有する。As described above, according to the present invention, a part of the magnetic head is provided with a part where magnetic saturation is likely to occur, and during recording, magnetic saturation is caused in this part to make the magnetic circuit constant magnetic flux, that is, substantially The temperature dependence of the output voltage of the magnetic head can be reduced by keeping the magnetic flux flowing through the magnetic circuit constant, and by keeping the recording magnetic field generated in the gap constant regardless of temperature etc., depending on the value of the saturation magnetic flux in the part where magnetic saturation is likely to occur. This has the effect of eliminating the
第１図は、本発明の一実施例の概要図。
第２図は、本発明の一実施例を説明するための記録起磁
力と磁気回路内の磁束の関係図。
第３図は、本発明の一実施例における記録電流と出力電
圧の関係図。
第４図は、本発明の他の実施例の概要図。
第５図は、本発明のもうひとつの実施例の概要図。
第６図は、従来の磁気ヘッドの概要図。
第７図は、従来の磁気ヘッドにおける記録電流と出力電
圧の関係図である。
１・・・ギャップ
２・・・飽和磁束密度の低いバックコア３・・・バック
コア
４・・・エコア
５・・・Ｌコア
６・・・巻線
７・・・飽和磁束密度の低い部材
８・・・断面積を小さくした部分
以 上
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴木 喜三部 他１名！
ギヤーｖ７
第
図
髪４聚起ふ１力
第２図
第
図
第
図
第
図
第
図
紀知覧充
第
図FIG. 1 is a schematic diagram of an embodiment of the present invention. FIG. 2 is a diagram showing the relationship between recording magnetomotive force and magnetic flux in a magnetic circuit for explaining one embodiment of the present invention. FIG. 3 is a diagram showing the relationship between recording current and output voltage in one embodiment of the present invention. FIG. 4 is a schematic diagram of another embodiment of the present invention. FIG. 5 is a schematic diagram of another embodiment of the present invention. FIG. 6 is a schematic diagram of a conventional magnetic head. FIG. 7 is a diagram showing the relationship between recording current and output voltage in a conventional magnetic head. 1... Gap 2... Back core 3 with low saturation magnetic flux density... Back core 4... Eco core 5... L core 6... Winding 7... Member 8 with low saturation magnetic flux density ...more than the portion with a reduced cross-sectional area Applicant Seiko Epson Co., Ltd. agent Patent attorney Kizobe Suzuki and 1 other person! Gear v7 Diagram Hair 4 Lifting 1 Power Diagram 2 Diagram Diagram Diagram Diagram Kichiran Mitsuru Diagram
Claims (1)
気回路の一部に、磁気飽和の生じやすい部分を含むこと
を特徴とする磁気ヘッド。A magnetic head used in a magnetic recording device, characterized in that a part of its magnetic circuit includes a portion where magnetic saturation is likely to occur.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18240788A JPH0231307A (en) | 1988-07-21 | 1988-07-21 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18240788A JPH0231307A (en) | 1988-07-21 | 1988-07-21 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0231307A true JPH0231307A (en) | 1990-02-01 |
Family
ID=16117760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18240788A Pending JPH0231307A (en) | 1988-07-21 | 1988-07-21 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0231307A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5299675A (en) * | 1990-11-09 | 1994-04-05 | T L Feeding Systems, Inc. | Pouch feeder method and device with angled rim |
| US5372236A (en) * | 1993-10-13 | 1994-12-13 | Ziniz, Inc. | Rotary conveyor singulation system |
| US5400893A (en) * | 1992-10-30 | 1995-03-28 | Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. | Bulk fed product ordering device, particularly for confectionery |
-
1988
- 1988-07-21 JP JP18240788A patent/JPH0231307A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5299675A (en) * | 1990-11-09 | 1994-04-05 | T L Feeding Systems, Inc. | Pouch feeder method and device with angled rim |
| US5400893A (en) * | 1992-10-30 | 1995-03-28 | Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. | Bulk fed product ordering device, particularly for confectionery |
| US5372236A (en) * | 1993-10-13 | 1994-12-13 | Ziniz, Inc. | Rotary conveyor singulation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4180835A (en) | Magnetic erasing head with gaps utilizing high flux density and high permeability | |
| EP0965987A3 (en) | Magneto-optical recording medium | |
| JPH0231307A (en) | Magnetic head | |
| JPS5687218A (en) | Vertical magnetization type magnetic head | |
| US2886790A (en) | Saturable reactance flip-flop device | |
| US4908724A (en) | Dual gap cross-field magnetic recording head with single gap signal excitation | |
| JPS6289313A (en) | Method of magnetization for permanent magnet | |
| US4268882A (en) | Magnetic erasing head | |
| JPH0327963B2 (en) | ||
| KR950009535A (en) | Magnetic recording method | |
| US2918663A (en) | Magnetic device | |
| US3439355A (en) | Flux-responsive head | |
| KR970067110A (en) | Thin film magnetic head | |
| JP2661560B2 (en) | Magnetoresistive element and reproducing method thereof | |
| JPS60157712A (en) | Magneto-resistance effect type magnetic head | |
| JPS6050607A (en) | Vertical magnetic recording and reproducing head | |
| JPS6214318A (en) | Magnetic reader | |
| JPS58115612A (en) | Magnetic head | |
| JPH0883408A (en) | Thin film magnetic head | |
| JPS58150121A (en) | Vertical magnetic recording head | |
| JPS5919213A (en) | Vertically magnetized recording head | |
| JPS6437709A (en) | Magnetic head device | |
| Thornley et al. | The effect of pole tip saturation on the performance of a recording head | |
| JPS60187923A (en) | Vertical magnetization recording medium | |
| JPS60258712A (en) | Vertically magnetizable magnetic head |