JPS6322989B2 - - Google Patents
Info
- Publication number
- JPS6322989B2 JPS6322989B2 JP10696781A JP10696781A JPS6322989B2 JP S6322989 B2 JPS6322989 B2 JP S6322989B2 JP 10696781 A JP10696781 A JP 10696781A JP 10696781 A JP10696781 A JP 10696781A JP S6322989 B2 JPS6322989 B2 JP S6322989B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- latent image
- transformation point
- head core
- 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
- 239000000463 material Substances 0.000 claims abstract description 29
- 230000009466 transformation Effects 0.000 claims abstract description 11
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- 230000035699 permeability Effects 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000004804 winding Methods 0.000 abstract description 6
- 239000004020 conductor Substances 0.000 abstract description 4
- 125000006850 spacer group Chemical group 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 230000005415 magnetization Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910018605 Ni—Zn Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004544 sputter deposition 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
- B41J2/43—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for magnetic printing
-
- 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
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
-
- 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
- G11B5/29—Structure or manufacture of unitary devices formed of plural heads for more than one track
-
- 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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/49—Fixed mounting or arrangements, e.g. one head per track
- G11B5/4969—Details for track selection or addressing
-
- 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
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/49—Fixed mounting or arrangements, e.g. one head per track
- G11B5/4969—Details for track selection or addressing
- G11B5/4984—Structure of specially adapted switching heads
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は磁気記録ヘツドに関するものである。
さらに詳しく言えば磁気印刷、マグネトグラフイ
ー等の技術分野に用いられる磁気記録ヘツドに関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic recording heads.
More specifically, the present invention relates to magnetic recording heads used in technical fields such as magnetic printing and magnetography.
従来のマグネトグラフイーでの磁気潜像形成過
程には、例えば次の方法がある。ベルト状の磁気
記録媒体に密着した磁気ヘツドに画像信号により
変調された交流電流を流し、記録媒体上に該交流
電流に応じた磁気潜像を得る方法、さらに例えば
磁気変態点の比較的低い磁気記録媒体に密着した
発熱素子に画像信号により変調された直流電流を
流し、記録媒体上に該直流電流に応じた磁気潜像
を得る方法がある。この後者の場合、磁気変態点
以上に加熱された磁気記録媒体の箇所には交流磁
界が加えられている。 The process of forming a magnetic latent image in conventional magnetography includes, for example, the following method. A method of supplying an alternating current modulated by an image signal to a magnetic head that is in close contact with a belt-shaped magnetic recording medium to obtain a magnetic latent image on the recording medium according to the alternating current; There is a method in which a direct current modulated by an image signal is passed through a heating element that is in close contact with a recording medium, and a magnetic latent image corresponding to the direct current is formed on the recording medium. In this latter case, an alternating magnetic field is applied to a portion of the magnetic recording medium that is heated above the magnetic transformation point.
上記した第一の方法においては、記録速度を高
めるためには、磁気ヘツドを記録媒体上に並列多
数個配置して駆動することが不可欠であるが、磁
気ヘツドアレイの製作には高度の微細加工技術が
要求され、また非常に高価なものとなるものであ
り実用的でない。 In the first method described above, in order to increase the recording speed, it is essential to drive a large number of magnetic heads arranged in parallel on the recording medium, but manufacturing the magnetic head array requires advanced microfabrication technology. is required, and is also very expensive, making it impractical.
さらに前記第二の方法においては、記載速度を
高めるために、発熱素子を多数個並列配置した発
熱素子アレイは比較的簡易に製作することができ
る。この第二の方法による磁気潜像形成過程の例
を第１図に示す。第１図において、比較的低い磁
気変態点を有する磁気記録媒体１はベース層２に
よつて支持されたベルト状形態のものである。該
記録媒体に密着走行する発熱部４を有する発熱素
子アレイ３には画像情報に応じた電流信号が加え
られ、磁気記録媒体１を磁気変態点以上に加熱す
る。このとき巻線６には交流電流が流れており、
磁気ヘツドコア５のギヤツプ部には交流磁界が発
生し、磁気記録媒体１の冷却中に記録媒体の加熱
部分が熱残留磁化して交流磁界が磁化パターンの
形として記録媒体中に残る。この方法において、
主な構成部分である磁気記録媒体としては、たと
えばCrO2を用いることができる。 Furthermore, in the second method, in order to increase the writing speed, a heating element array in which a large number of heating elements are arranged in parallel can be manufactured relatively easily. An example of the process of forming a magnetic latent image using this second method is shown in FIG. In FIG. 1, a magnetic recording medium 1 having a relatively low magnetic transformation point is in the form of a belt supported by a base layer 2. In FIG. A current signal corresponding to image information is applied to a heating element array 3 having a heating section 4 running in close contact with the recording medium, thereby heating the magnetic recording medium 1 to a temperature higher than the magnetic transformation point. At this time, an alternating current is flowing through the winding 6,
An alternating magnetic field is generated in the gap portion of the magnetic head core 5, and while the magnetic recording medium 1 is being cooled, the heated portion of the recording medium becomes thermally remanent magnetized, and the alternating magnetic field remains in the recording medium in the form of a magnetization pattern. In this method,
For example, CrO 2 can be used as the magnetic recording medium, which is the main component.
CrO2のキユーリー点は130℃付近であり、発熱
素子アレイにより容易に加熱できる温度である。
しかし通常CrO2媒体のベース層として用いられ
ているプラスチツク材料はこの温度域でも熱変形
がみられ、媒体の多数回使用においては、この熱
変形が磁性トナーによる顕像化過程でノイズとな
つてあらわれる。さらにCrO2は通常バンイダー
中に分散された塗布型の記録媒体であるために、
磁化密度が充分でなく、飽和記録されたとしても
現像能力はなお充分とはいえない。 The Curie point of CrO 2 is around 130°C, a temperature that can be easily heated with a heating element array.
However, the plastic material normally used as the base layer of CrO 2 media exhibits thermal deformation even in this temperature range, and when the medium is used many times, this thermal deformation becomes noise in the visualization process using magnetic toner. Appears. Furthermore, since CrO 2 is usually a coated recording medium dispersed in a binder,
The magnetization density is not sufficient, and even if saturated recording is achieved, the developing ability is still not sufficient.
本発明の目的は上記した従来技術の欠点を排除
し、高速にて磁気潜像を形成することができかつ
高度な微細加工技術を必要としないマグネトグラ
フイーに用いられる磁気記録ヘツドを提供するこ
とである。 An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and provide a magnetic recording head for use in magnetography that can form a magnetic latent image at high speed and does not require advanced microfabrication technology. It is.
本発明の他の目的は磁気記録媒体のベース層の
熱変形をひきおこすことなく常に優れた磁気潜像
を形成することのできる磁気記録ヘツドを提供す
ることである。 Another object of the present invention is to provide a magnetic recording head that can consistently form an excellent magnetic latent image without causing thermal deformation of the base layer of the magnetic recording medium.
さらに本発明の他の目的は磁気記録媒体を特定
することなく、すなわち、あらゆる種類の磁気記
録媒体を用いて磁気潜像を形成することのできる
磁気記録ヘツドを提供することである。 Still another object of the present invention is to provide a magnetic recording head that can form a magnetic latent image without specifying the magnetic recording medium, that is, by using any kind of magnetic recording medium.
本発明によれば、原稿幅の長トラツク磁気記録
ヘツドコアの空隙下部に比較的低い磁気変態点を
有する高透磁率体をスペーサとして配置し、さら
にその下に画素の幅に対応して分割された発熱手
段を設けることによつて、上記の欠点の排除され
たマグネトグラフイーに適した磁気記録ヘツドが
得られる。 According to the present invention, a high magnetic permeability material having a relatively low magnetic transformation point is arranged as a spacer at the bottom of the air gap of a long track magnetic recording head core with a document width, and further below that, a material divided into parts corresponding to the width of a pixel is arranged. By providing a heat generating means, a magnetic recording head suitable for magnetography can be obtained which eliminates the above-mentioned drawbacks.
本発明の基本構成を更に詳しく述べれば、磁気
記録媒体移動方向と略直角に長尺の磁気ヘツドコ
アを設け、この磁気ヘツドコアの記録媒体と接触
する空隙の中に、分割された発熱素子と該発熱素
子が取付けられた比較的低い磁気変態点を有する
高透磁率体と、該高透磁率体を媒体からかく絶す
る非磁性体とから構成されている。 To describe the basic configuration of the present invention in more detail, a long magnetic head core is provided substantially perpendicular to the direction of movement of the magnetic recording medium, and a divided heating element and the heat generating element are disposed in the gap in contact with the recording medium of the magnetic head core. It is composed of a high magnetic permeability material having a relatively low magnetic transformation point to which an element is attached, and a nonmagnetic material that excludes the high magnetic permeability material from the medium.
本発明による磁気記録ヘツドを第２図によつて
説明する。第２図において、巻線６には交流電流
を常に流してある。交流電流の周波数は記録媒体
と磁気ヘツドの相対速度さらに顕像化に用いられ
るトナーの大きさによつて最適値が与えられる。
発熱部４に導体９より供給される直流電流が流れ
ていない場合には、磁路は次の通りとなる。すな
わち磁気ヘツドコア５を通過した磁力線は高透磁
率体８を貫通して完全な閉磁路となつている。さ
らに導体９に接続され、画像情報に応じて選択的
にスイツチするトランジスタ（図示せず）のコレ
クター電流が発熱部を少なくとも高透磁率体８の
磁気変態点以上に加熱することによつて高透磁率
体８を非磁性化する。画像情報に応じて選択的に
非磁性となる高透磁率体８付近の空隙部では、巻
線６によつて誘起された磁束の磁路は該空隙部分
に漏れることになり、記録媒体１の抗磁力より大
きな磁界が加わると磁化パターンを記録媒体上に
磁気潜像の形で残す。 A magnetic recording head according to the present invention will be explained with reference to FIG. In FIG. 2, an alternating current is constantly flowing through the winding 6. The frequency of the alternating current is given an optimum value depending on the relative speed between the recording medium and the magnetic head and the size of the toner used for visualization.
When the direct current supplied from the conductor 9 is not flowing to the heat generating part 4, the magnetic path is as follows. That is, the lines of magnetic force that have passed through the magnetic head core 5 pass through the high magnetic permeability body 8, forming a completely closed magnetic path. Further, a collector current of a transistor (not shown) connected to the conductor 9 and selectively switched according to the image information heats the heat generating part to at least the magnetic transformation point of the high permeability material 8 or higher, thereby increasing the high permeability. The magnetic material 8 is made non-magnetic. In the gap near the high magnetic permeability material 8 that selectively becomes non-magnetic depending on the image information, the magnetic path of the magnetic flux induced by the winding 6 leaks into the gap, causing the recording medium 1 to become non-magnetic. When a magnetic field larger than the coercive force is applied, a magnetization pattern is left on the recording medium in the form of a magnetic latent image.
本発明によれば、非磁性体７を記録媒体１と接
触する磁気ヘツドコアの空隙部に配置することに
より、発熱部に誘起された熱を記録媒体から遮断
する。すなわち非磁性体７は磁気記録媒体のベー
ス層２の熱変形を防止する作用をする。 According to the present invention, by arranging the nonmagnetic material 7 in the gap of the magnetic head core that contacts the recording medium 1, the heat induced in the heat generating part is blocked from the recording medium. That is, the nonmagnetic material 7 functions to prevent thermal deformation of the base layer 2 of the magnetic recording medium.
本発明において使用する高透磁率体としては
Ni−Znフエライト、Ni0.79Fe合金などが使用で
きるが前者のキユリー点は150℃であり、後者は
約250℃である。 The high magnetic permeability material used in the present invention is
Ni-Zn ferrite, Ni 0.79 Fe alloy, etc. can be used, but the former has a Kyrie point of 150°C, and the latter has a Kyrie point of about 250°C.
なお、本発明において非磁性体を記録媒体に接
触させる形態としては、第２図のように直接記録
媒体側に接触させてもベース側から接触させても
よいことはいうまでもない。 It goes without saying that in the present invention, the nonmagnetic material may be brought into contact with the recording medium either directly on the recording medium side as shown in FIG. 2 or from the base side.
本発明による磁気記録ヘツドはトラツク方向に
多数個分割配列した高透磁率体に直流電流を画像
情報に応じて選択して流し、高透磁率体自らの発
熱により磁気変態点以上に加熱するようにしても
よい。この場合には言うまでもなく発熱素子アレ
イは不要となる。この場合高透磁率体としては発
熱素子に使用され得るような電気抵抗値、例えば
約0.2Ω・cmの値を有する単結晶フエライトなど
が望ましい。さらに磁気ヘツドコア材料としては
電気抵抗値の大きい熱間静水圧プレスフエライト
材料などが望ましい。 In the magnetic recording head according to the present invention, a direct current is selectively passed through a high magnetic permeability material divided into a large number of pieces arranged in the track direction according to image information, and the high magnetic permeability material is heated to a temperature above its magnetic transformation point by its own heat generation. It's okay. Needless to say, in this case, the heating element array becomes unnecessary. In this case, the high magnetic permeability material is preferably a single crystal ferrite having an electrical resistance value that can be used in a heating element, for example, a value of about 0.2 Ω·cm. Further, as the magnetic head core material, a hot isostatically pressed ferrite material having a high electrical resistance value is desirable.
以下に本発明を実施例によつてさらに詳細に説
明する。 The present invention will be explained in more detail below using examples.
実施例
高透磁率体８としてNi−Znフエライトを用い、
又、７の非磁性体としてはSiO2、Ta2O5、などを
スパツタ法で10μの厚みになるように高透磁率体
に着膜した。これらの物質は耐熱性の高いもので
あれば加工性を考慮すれば任意のものから選択す
ることができる。その幅は30μｍであり、その長
さすなわち磁気ヘツドのトラツク幅は10cmであつ
た。また該高透磁率体８の磁気変態点すなわちキ
ユーリー温度は150℃である。ベース層２の片面
にはCo−Ni−Ｐ合金からなる磁気記録媒体１が
形成されている。記録層の厚みは2μｍであつた。
第２図に示す通りの配置すなわち、磁気記録媒体
１の露出面には磁気ヘツドコア５が接触走行し、
記録媒体と発熱部４および磁気ヘツドコア５の相
対速度は3.8cm／秒であつた。また巻線６に加え
る正弦波電流の周波数は200Hzであつた。すなわ
ち磁気記録層に二次元パターンとして残る磁化の
波長は190μｍである。この条件で作成した磁気
潜像を磁性トナーによつて可視化した顕像は、光
学濃度I.D＝1.1以上であり、充分な作像能力が認
められた。Example Using Ni-Zn ferrite as the high magnetic permeability material 8,
Further, as the non-magnetic material No. 7, a film of SiO 2 , Ta 2 O 5 or the like was deposited on the high magnetic permeability material by sputtering to a thickness of 10 μm. These materials can be selected from any material with high heat resistance in consideration of processability. Its width was 30 μm, and its length, ie, the track width of the magnetic head, was 10 cm. Further, the magnetic transformation point, that is, the Curie temperature, of the high magnetic permeability material 8 is 150°C. A magnetic recording medium 1 made of a Co--Ni--P alloy is formed on one side of the base layer 2. The thickness of the recording layer was 2 μm.
In the arrangement shown in FIG. 2, the magnetic head core 5 runs in contact with the exposed surface of the magnetic recording medium 1.
The relative speed between the recording medium, heat generating section 4, and magnetic head core 5 was 3.8 cm/sec. Further, the frequency of the sinusoidal current applied to the winding 6 was 200Hz. That is, the wavelength of magnetization remaining as a two-dimensional pattern in the magnetic recording layer is 190 μm. The image obtained by visualizing the magnetic latent image created under these conditions using magnetic toner had an optical density ID of 1.1 or more, and sufficient image forming ability was recognized.
本発明によれば、分割された発熱手段により磁
気ヘツドコアの空隙部の高透磁率体を選択的に加
熱し、それによつて生じた漏れ磁束により記録媒
体に潜像を形成するようにしたので、高度の微細
加工を必要とせずに高速で磁気潜像を形成するこ
とができる。また、高透磁率体と磁気媒体との間
には非磁性体を設けたので、この非磁性体により
発熱体からの熱を遮断することができ、記録媒体
の熱変形を防止できると共に、磁束の遮断が確実
となる。 According to the present invention, the high magnetic permeability material in the gap of the magnetic head core is selectively heated by the divided heating means, and the leakage magnetic flux generated thereby forms a latent image on the recording medium. A magnetic latent image can be formed at high speed without requiring sophisticated microfabrication. In addition, since a non-magnetic material is provided between the high permeability material and the magnetic medium, this non-magnetic material can block the heat from the heating element, prevent thermal deformation of the recording medium, and prevent magnetic flux. is ensured.
第１図は従来のマグネトグラフイーに用いられ
る磁気潜像形成の原理を表わす説明図であり、第
２図は本発明による磁気記録ヘツドの構成を示す
断面図である。
図中符号：１……磁気記録媒体、２……ベース
層、３……発熱素子アレイ、４……発熱部、５…
…磁気ヘツドコア、６……巻線、７……非磁性
体、８……高透磁率体、９……導体。
FIG. 1 is an explanatory diagram showing the principle of forming a magnetic latent image used in conventional magnetography, and FIG. 2 is a sectional view showing the structure of a magnetic recording head according to the present invention. Codes in the figure: 1...Magnetic recording medium, 2...Base layer, 3...Heating element array, 4...Heating part, 5...
... Magnetic head core, 6 ... Winding wire, 7 ... Non-magnetic material, 8 ... High magnetic permeability material, 9 ... Conductor.
Claims (1)
変態点を有する高透磁率体と、該高透磁率体に積
層され磁気記録媒体と密着走行する非磁性体と、
該高透磁率体を選択的に電圧印加して加熱するた
めの分割された発熱手段とを具備したことを特徴
とする磁気記録ヘツド。1. A high magnetic permeability material having a relatively low magnetic transformation point in the gap of the magnetic head core, and a non-magnetic material laminated on the high magnetic permeability material and running in close contact with the magnetic recording medium.
1. A magnetic recording head comprising divided heating means for selectively applying a voltage to and heating the high magnetic permeability material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10696781A JPS588667A (en) | 1981-07-10 | 1981-07-10 | Magnetic recording head |
| US06/396,504 US4520409A (en) | 1981-07-10 | 1982-07-08 | Thermal and magnetic recording head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10696781A JPS588667A (en) | 1981-07-10 | 1981-07-10 | Magnetic recording head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS588667A JPS588667A (en) | 1983-01-18 |
| JPS6322989B2 true JPS6322989B2 (en) | 1988-05-13 |
Family
ID=14447079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10696781A Granted JPS588667A (en) | 1981-07-10 | 1981-07-10 | Magnetic recording head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS588667A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61293176A (en) * | 1985-06-19 | 1986-12-23 | Toyo Electric Mfg Co Ltd | Overvoltage suppressor circuit of power converter |
| JPH01129277A (en) * | 1987-11-13 | 1989-05-22 | Sanyo Electric Co Ltd | Recording device |
| JP4101240B2 (en) | 2005-01-28 | 2008-06-18 | Ｔｄｋ株式会社 | Magnetic head |
-
1981
- 1981-07-10 JP JP10696781A patent/JPS588667A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS588667A (en) | 1983-01-18 |
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