JPS5870414A - Vertical type magnetic recording and reproducing device - Google Patents
Vertical type magnetic recording and reproducing deviceInfo
- Publication number
- JPS5870414A JPS5870414A JP16916381A JP16916381A JPS5870414A JP S5870414 A JPS5870414 A JP S5870414A JP 16916381 A JP16916381 A JP 16916381A JP 16916381 A JP16916381 A JP 16916381A JP S5870414 A JPS5870414 A JP S5870414A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- magnetic
- main
- pole
- recording
- 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
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
- G11B5/48—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
- G11B5/52—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 with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
- G11B5/538—Disposition or mounting of pole pieces on rotating support
Landscapes
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
極を回転シリンダ側に設けると共にこの回転シリンダの
周りに補助磁極を固定し、回転される主磁極と固定され
た補助磁極との間に磁気閉回路を形成することにより、
効率良く高密度記録再生を実現し得る垂直型磁気記録再
生装置を提供すること（１）
を目的とする。[Detailed description of the invention] By providing a pole on the rotating cylinder side and fixing an auxiliary magnetic pole around the rotating cylinder, a magnetic closed circuit is formed between the rotating main magnetic pole and the fixed auxiliary magnetic pole. ,
The object of the present invention is (1) to provide a perpendicular magnetic recording and reproducing device that can efficiently realize high-density recording and reproducing.
近年、磁気記録媒体を高密度記録再生し得る垂直型磁気
記録方式が注目されている。この原理は、第１図に示す
如く、磁気記録媒体１を間におき主磁極２と補助磁極３
とを対向させ、補助磁極３のコイル３ａに記録電流を流
して補助磁極３を磁化せしめると共に主磁極２を磁化す
ることにより、相対的に移動される媒体ｌの垂直方向（
厚み方向）に配向する磁一を起して記録を行い、或い□
は相対的に移動される媒体１に記録された垂直方向のイ
庭極により主磁極２が磁化され、これにより、補助磁極
３内を貫通ずる磁束を以ってコイル３ａの両端に再生電
圧を得て再生が行なわれるものであり、一般に使用され
ている水平型磁気紀録ｊ１］−生方式のように磁気記録
媒体１にその水平力向（長手方向）に磁極が形成され２
るものに対して、垂直方向（厚−み方向）に磁極が形成
されるものであるから、上記の水平型磁気記録方式に比
（ッ最知ハ［：録波ドは非常に短く、高密度１１シ録再
生を実．ｌＪＪ ｊ， ？！＋ろという利点がある。In recent years, perpendicular magnetic recording systems that can perform high-density recording and reproduction of magnetic recording media have been attracting attention. As shown in FIG.
The medium l is moved in the perpendicular direction (
Recording is performed by inducing a magnetic field oriented in the thickness direction), or □
The main magnetic pole 2 is magnetized by the vertical magnetic pole recorded on the medium 1 that is relatively moved, and the magnetic flux passing through the auxiliary magnetic pole 3 causes a reproduction voltage to be applied to both ends of the coil 3a. As in the generally used horizontal type magnetic recording method, magnetic poles are formed on the magnetic recording medium 1 in the horizontal force direction (longitudinal direction).
Compared to the above-mentioned horizontal magnetic recording method, since the magnetic pole is formed in the vertical direction (thickness direction), the recording wave length is very short and high. It has the advantage of being able to record and reproduce data at a density of 11 cm.
（２）
一方、ビデオテープレコーダ等においては、種々の利点
があることから回転シリンダにビデオヘッドを設けて一
体的に回転させる回転ヘッド方式の磁気記録再生システ
ムによって密度の高い記録が可能となっており、現在、
この種のシステムとしては水平型磁気記録方式が採用さ
れている。そこで、種々の利点があるこの回転ヘッドを
使用した水平型の磁気記録方式とこれまた種々の利点が
ある垂直型磁気記録方式とを共に利用した垂直型磁気記
録再生装置が誕生すれば、効率の良い記録再生が実現出
来るため、その開発が望まれていた。(2) On the other hand, in video tape recorders and the like, high-density recording has become possible through a rotating head type magnetic recording and reproducing system in which a video head is attached to a rotating cylinder and rotates integrally, due to various advantages. Currently,
A horizontal magnetic recording method is adopted as this type of system. Therefore, if a vertical magnetic recording/reproducing device were created that utilizes both the horizontal magnetic recording method using this rotating head, which has various advantages, and the vertical magnetic recording method, which also has various advantages, it would be possible to improve efficiency. Its development was desired because it could achieve good recording and playback.
そして、その一方法として、垂直型磁気記録再生装置が
誕生したものであるが、この垂直型磁気記録再生装置に
お（１）では回転シリンダの外周面に添接走行される磁
気記録媒体を回転シリンダと共に一体的に回転されろ主
磁極とその回転シリンダの外側に固定された補助磁極と
で挾む構成とする必要がある。その−例古して第２図に
示す如くのものが提案された。即ち、回転シリンダ４の
外周面に略半周に亘って近接対向する円弧状のコア５（
３）
とこのコア５の周方向に巻回されたコイル６とにより第
１図に示す如くの補助磁極３に１１応する補助磁極７（
固定）を構成し、回転シリンダ４の外周に１８０°間隔
で配設された合Ｓｔ ２個の主磁極８（２ヘツド型）が
その回転シリンダ４の略半周に亘って添接走行される磁
気記録媒体９を間におき補助磁極８に回転シリンダ４の
回転に伴って対向するようになしたものである。As one method for this, a perpendicular magnetic recording and reproducing device was born. It is necessary to have a configuration in which the main magnetic pole rotates integrally with the cylinder and is sandwiched between an auxiliary magnetic pole fixed to the outside of the rotating cylinder. In the past, something like the one shown in Figure 2 was proposed. That is, an arc-shaped core 5 (
3) With the coil 6 wound in the circumferential direction of the core 5, an auxiliary magnetic pole 7 (11) corresponding to the auxiliary magnetic pole 3 as shown in FIG.
Two main magnetic poles 8 (two-head type), which are arranged at 180° intervals around the outer circumference of the rotating cylinder 4, run along approximately half the circumference of the rotating cylinder 4. A recording medium 9 is placed in between and faces the auxiliary magnetic pole 8 as the rotary cylinder 4 rotates.
斯る構成によれば、コイル６に記録電流を流すと、補助
磁極７はその半径方向に磁化され、これにより主磁極８
が誘起磁化されて磁気記録媒体９にその厚み方向に磁極
が形成され、記録が行なわれる。再生の場合には、磁気
記録媒体９の垂直磁極により主磁極８が磁化され、これ
により補助磁極７のコイル６の両端に再生電圧が現われ
るものであるが、上記した如く補助磁極７目回転シリン
ダ４の略半周を覆うように添わされており、周方向に可
成り広がっているため、第３図ζこ概略的に示す如く、
磁化された主磁極８から出た（１す（力線は補助磁極７
の内周面を沿って主磁極８に戻る形と（４）
なり、主磁極８からの磁力線は図示２点鎖線で示す如く
補助磁極７のコイル６と鎖交せずコイル６に磁力線が作
用しないため、したがって再生出力は得られないという
欠点があった。According to such a configuration, when a recording current is passed through the coil 6, the auxiliary magnetic pole 7 is magnetized in its radial direction, and thereby the main magnetic pole 8
is induced magnetization, magnetic poles are formed in the thickness direction of the magnetic recording medium 9, and recording is performed. In the case of reproduction, the main magnetic pole 8 is magnetized by the vertical magnetic pole of the magnetic recording medium 9, and as a result, a reproduction voltage appears at both ends of the coil 6 of the auxiliary magnetic pole 7. 4, and spreads considerably in the circumferential direction, as schematically shown in Fig. 3.
The line of force is from the magnetized main pole 8 (the line of force is the auxiliary pole 7
(4), and the lines of magnetic force from the main pole 8 do not interlink with the coil 6 of the auxiliary pole 7, as shown by the two-dot chain line in the figure, and the lines of magnetic force act on the coil 6. Therefore, there was a drawback that no reproduction output could be obtained.
本発明目上症欠点を除去したものであり、以下その一実
施例につき図面と共に説明する。The disadvantages of the present invention have been eliminated, and one embodiment thereof will be described below with reference to the drawings.
第４図（Ａ） 、 （）３）は夫々本発明になる垂直型
磁気記録再生装置の一実施例の正面図、側面図、第５図
は同実施例の一部切欠斜視図であ゛る。4(A) and ()3) are respectively a front view and a side view of an embodiment of the perpendicular magnetic recording/reproducing apparatus according to the present invention, and FIG. 5 is a partially cutaway perspective view of the same embodiment. Ru.
１０は回転軸１１に軸支された回転シリンダであり、周
壁ＩＱａを有した大略筒状に構成されており、軸１１の
回転に伴い所定速度で一体的に回転する。回転シリンダ
１０の内側にはフェライト等の高透磁率の磁性材よりな
る回転円板１２が嵌合固定され、その−側面は該シリン
ダｌＯの側面より若干突出しており、この円板１２は回
転シリンダ１０と一体的に回転する。Reference numeral 10 denotes a rotating cylinder supported by the rotating shaft 11, which has a substantially cylindrical shape with a peripheral wall IQa, and integrally rotates at a predetermined speed as the shaft 11 rotates. A rotating disk 12 made of a magnetic material with high magnetic permeability such as ferrite is fitted and fixed inside the rotating cylinder 10, and its side surface slightly protrudes from the side surface of the cylinder lO. Rotates integrally with 10.
回転シリンダ１０の周壁］Ｏａには１８０°間隔で合計
２個のｖＩ通孔を形成してあり、これら貫通孔には主磁
極１３が嵌入しており、その頭部即ち先（５）
端部は周壁１０ａの外周面より外方に稍突出し、また後
部は回転円板１２の内側側面に取付けられている。[Peripheral wall of rotating cylinder 10]A total of two vI through holes are formed at 180° intervals in Oa, and the main magnetic pole 13 is fitted into these through holes, and the head, i.e., the tip (5) and the end thereof. protrudes slightly outward from the outer peripheral surface of the peripheral wall 10a, and the rear portion is attached to the inner side surface of the rotating disk 12.
主磁極１３は、第６図に示す如くフェライト等の取付部
１．３ａの先端にセラミック、ガラス等の一対の非磁性
材ブロック］、３ｂ 、 １３ｔ）’を以ってＡｈ ｆ
！技術により形成された厚さ１〜１００μｍ［度の磁性
薄Ｗｔｊ ］、３ｃ （バーマロ・イ、レンダスト、フ
ェライト等）を挾んでなる構成であり、一対のブロック
１３ｂ。As shown in FIG. 6, the main magnetic pole 13 has a pair of non-magnetic material blocks such as ceramic or glass at the tip of a mounting portion 1.3a made of ferrite or the like.
! The block 13b is composed of a pair of blocks 13b sandwiching a magnetic thin film Wtj of 1 to 100 μm [degrees of thickness], 3c (barmaro-I, Rendust, ferrite, etc.) formed by a technique.
１３ｂ′は取付部１３ａに接着、溶着等の手段により固
着され、磁性薄膜１．３０とフェライト等の取付１１３
ａとは磁気的に結合している。前述した如く、この主磁
極１３はその後部の取付部１３ａにて第７図（Ａ）、。13b' is fixed to the mounting part 13a by adhesive, welding, etc., and includes a magnetic thin film 1.30 and a mounting 113 of ferrite, etc.
It is magnetically coupled with a. As mentioned above, this main magnetic pole 13 is attached at its rear mounting portion 13a as shown in FIG. 7(A).
ｆｆ３］に示す様に回転円板１２の周瞭部にねじ止めさ
れ、フェライト等の取付部１３ａ七回転円板１２とは磁
気的に結合している。尚、ねじ止めの代りに接着、溶着
等の手段によっても取付けることができる。ff3], it is screwed to the peripheral part of the rotary disk 12, and a mounting portion 13a made of ferrite or the like is magnetically coupled to the seven-rotary disk 12. Incidentally, instead of screwing, it can be attached by means such as adhesion or welding.
１４は円弧状板１５．ヨーク１６．固定円板１７により
構成された補助磁極である。円弧状板１５（６）
はフェライト等の高透磁率の磁性材により構成さね、て
七り、回転シリンダ１０の周壁１０ａをその略半周りこ
亘り覆うように添わせてあり、円弧状板１５の内周部は
周壁１．Ｏａの外局面に近接対向している。14 is an arc-shaped plate 15. York 16. This is an auxiliary magnetic pole composed of a fixed disk 17. The arc-shaped plate 15 (6) is made of a magnetic material with high magnetic permeability such as ferrite, and is attached so as to cover approximately half of the peripheral wall 10a of the rotating cylinder 10. The inner peripheral part of the peripheral wall 1. It is closely opposed to the outer surface of Oa.
この円弧状板１５の中央部には略鈎状のヨーク１６の一
端が固着しており、円弧状板１５とヨーク１６みは磁気
的Ｃど結合している。ヨーク１６はフェライト等の磁性
材により構成され、その中央部にはコ、イル１６ａを巻
回してあり、主磁極１４のコアとして環化する。ヨーク
１６の他端にはフェライト等の高未磁、率の磁性材より
なる固定円板１７が固着され、ヨーク１６と固定円板１
７とは磁気的に結合しており、固定円板１７は回転円板
１２の側面に空１１４１８をおき近接対向している。本
実施例においては、この空隙寸法りは約５〜５００μｍ
程虻であり、回転円板１２の側面と回転シリンダ１０の
側面との離間寸法ｄは約１０〜１０００μｍ程度である
。One end of a substantially hook-shaped yoke 16 is fixed to the center of the arcuate plate 15, and the arcuate plate 15 and the yoke 16 are magnetically coupled. The yoke 16 is made of a magnetic material such as ferrite, and has a coil 16a wound around its center, which forms a ring as the core of the main pole 14. A fixed disk 17 made of a magnetic material such as ferrite with a high unmagnetized rate is fixed to the other end of the yoke 16, and the yoke 16 and the fixed disk 1
7 is magnetically coupled, and the fixed disk 17 is closely opposed to the rotating disk 12 with a space 11418 formed on the side surface thereof. In this example, this gap size is approximately 5 to 500 μm.
The distance d between the side surface of the rotating disk 12 and the side surface of the rotating cylinder 10 is about 10 to 1000 μm.
磁気記録媒体１９は第４図（５）に示す如く、回転シリ
ンダ１０の外周面に添接されて走行される。As shown in FIG. 4(5), the magnetic recording medium 19 is attached to the outer peripheral surface of the rotating cylinder 10 and runs.
（７）
記録時において、コイル１６ａに計１録電流が流される
と補助磁極１４が磁化されると共に、固定円板１７、！
：回転円板１２との間の空隙１８を介してその磁束が第
５図示矢印Ａ方向に回転される主磁極１３に導かれて主
磁極１３が磁化され、この上を走行する磁気記録媒体１
９にその厚み方向に配向された信号磁極が形成される。(7) During recording, when a total of one current is passed through the coil 16a, the auxiliary magnetic pole 14 is magnetized, and the fixed disk 17, !
: The magnetic flux is guided to the main magnetic pole 13 rotated in the direction of the fifth arrow A in the figure through the air gap 18 between the rotating disk 12, the main magnetic pole 13 is magnetized, and the magnetic recording medium 1 runs on the main magnetic pole 13.
A signal magnetic pole oriented in the thickness direction is formed at 9 .
また再生時においては、磁気記録媒体１９の信号磁極に
よって磁化された主磁極１３からの磁束は上記回転円板
１２゜空隙１８．固定円板１７を介してヨーク１６内を
貫通し、第８図に示す如くの磁気閉回路２０を形成する
ため、コイル１６ａの両端に再生電圧を得ることができ
る。During reproduction, the magnetic flux from the main magnetic pole 13 magnetized by the signal magnetic pole of the magnetic recording medium 19 flows through the rotating disk 12° air gap 18. Since it passes through the inside of the yoke 16 via the fixed disk 17 and forms a magnetic closed circuit 20 as shown in FIG. 8, a reproduction voltage can be obtained at both ends of the coil 16a.
磁気閉回路２０を構成するために、シリング１０と一体
的に回転される回転円板１２占固定円板１７とを設けで
あるが、その空隙寸法Ｖは僅少であり、且つ対向面積は
犬であるため、空隙１８における磁気抵抗は小であり、
したがって低１に力で記録し得しかも良好な再生出力レ
ベルを得ることができ、高密度記録再生を実現し得る。In order to configure the magnetic closed circuit 20, a rotary disk 12 and a stationary disk 17 which are rotated integrally with the shilling 10 are provided, but the gap size V is small and the facing area is small. Therefore, the magnetic resistance in the air gap 18 is small,
Therefore, it is possible to record with a low force of 1, obtain a good reproduction output level, and realize high-density recording and reproduction.
（８）
尚、上記固定円板１７．ヨーク１６９円弧状板１５を一
体的に高透磁率の磁性材により構成してもよい。また本
考案垂直型磁気記録再生装置は記録専用又は再生専用の
装置としてもよい。(8) Furthermore, the above-mentioned fixed disk 17. The yoke 169 and the arcuate plate 15 may be integrally made of a magnetic material with high magnetic permeability. Further, the perpendicular magnetic recording/reproducing apparatus of the present invention may be a recording-only or reproduction-only apparatus.
上述の如く、本発明になる垂直型磁気記録再生装置は、
主磁極を有する回転シリンダと、該主磁極の回転軌跡に
沿って所定の区間以上救主磁極と接触しつつ走行される
磁性媒体と、該磁性媒体を挾むように上記回転シリンダ
と所定の間隔を有し且つ該磁性媒体と主磁極との接触区
間の大部分に亘って対向配置された補助磁極とよりなり
、該補助磁極と主磁極とを磁気的に結合させて磁気閉回
路を形成するようにした構成であり、記録時には主磁極
と補助磁極との間の該磁気閉回路に補助磁極からの磁束
が案内され確実に主磁極が磁化されるため、低電力で垂
直型磁気記録を行なうことができ、また再生時にも磁化
された主磁イａからの磁束が該磁気閉回路を介して補助
磁極内を有効的ζこ貫通ずるため、高出力レベルの再生
信号を得ることができ、効率良い高密度記録再生を実現
できる（９）
という特長を有する。As mentioned above, the perpendicular magnetic recording/reproducing device according to the present invention has the following features:
A rotating cylinder having a main magnetic pole, a magnetic medium that travels along the rotation locus of the main magnetic pole while being in contact with the savior magnetic pole for a predetermined section or more, and a rotating cylinder having a predetermined interval from the rotating cylinder so as to sandwich the magnetic medium. and includes an auxiliary magnetic pole facing each other over most of the contact area between the magnetic medium and the main magnetic pole, and the auxiliary magnetic pole and the main magnetic pole are magnetically coupled to form a magnetic closed circuit. During recording, the magnetic flux from the auxiliary magnetic pole is guided through the magnetic closed circuit between the main magnetic pole and the auxiliary magnetic pole, and the main magnetic pole is reliably magnetized, making it possible to perform perpendicular magnetic recording with low power. Also, during reproduction, the magnetic flux from the magnetized main magnetic pole a effectively passes through the auxiliary magnetic pole through the magnetic closed circuit, making it possible to obtain a high output level reproduction signal, which is efficient. It has the advantage of being able to realize high-density recording and reproduction (9).
第１図は垂直型磁気記録再生方式の原理を示す図、第２
図はその垂直型磁気記録再生方式を回転型の磁気記録再
生システムに適用した垂直型磁気記録再生装置の一例を
示す図、第３図はその装置の一部を概略的に示す図、第
４図ｆＡ＋ 、 （Ｂ）は夫々本発明になる垂直型磁気
記録再生装置の一実施例の正面図、側面図、第５図は同
実施例の一部切欠斜視図、第６図は同実施例装置に設け
られる主磁極の斜視図、第７図（Ａ） 、 （Ｂ）は夫
々その主磁極の取付力を示す正面図、側面図、第８図は
同実施例装置の要部の一部縦断面図である。
１．９．１９・・・磁気記録媒体、２，８．１３・・・
主磁極、３，７．１４・・・補助磁極、３ａ。
６ 、１６ａ・・−コイル、４．１０＠−回転シリンダ
、５・・・コア、１１・・拳回転軸、１２・・・回転円
板、１３ａ・・・取付部、１３ｂ 、 １３ｂ’・・・
非磁性材ブロック、１３ｃ＠ｍｓ磁性薄膜、１５・・−
円弧状板、１６・・・ヨーク、１７・拳・固定円板、１
８１１・豐空隙、（１０）
２０・・・磁気閉回路。
特許出願人 日本ビクター株式会社
代 理 人 弁理士 伊 東 忠 彦（１１）
第４図
（Ａ）（Ｂ）
第５図
第８図
１Figure 1 is a diagram showing the principle of the perpendicular magnetic recording and reproducing system.
The figure shows an example of a perpendicular magnetic recording and reproducing device in which the perpendicular magnetic recording and reproducing method is applied to a rotating magnetic recording and reproducing system. Figures fA+ and (B) are respectively a front view and a side view of an embodiment of the perpendicular magnetic recording/reproducing device according to the present invention, Figure 5 is a partially cutaway perspective view of the embodiment, and Figure 6 is the same embodiment. A perspective view of the main magnetic pole provided in the device; FIGS. 7(A) and 7(B) are a front view and a side view showing the attachment force of the main magnetic pole, respectively; FIG. 8 is a part of the main part of the device according to the embodiment. FIG. 1.9.19...Magnetic recording medium, 2,8.13...
Main magnetic pole, 3,7.14... Auxiliary magnetic pole, 3a. 6, 16a...-coil, 4.10@-rotating cylinder, 5... core, 11... fist rotating shaft, 12... rotating disk, 13a... mounting portion, 13b, 13b'...・
Non-magnetic material block, 13c@ms magnetic thin film, 15...-
Arc-shaped plate, 16... Yoke, 17, fist/fixed disc, 1
811・Gap, (10) 20...Magnetic closed circuit. Patent applicant: Victor Japan Co., Ltd. Agent: Tadahiko Ito (11) Figure 4 (A) (B) Figure 5 Figure 8 Figure 1
Claims (1)
沿って所定の区間以上該主磁極と接触しつつ走行される
磁性媒体と、該磁性媒体を挾むように上記回転シリング
と所定の間隔を有し且つ該磁性媒体と主磁極との接触区
間の大部分に亘って対向配置された補助磁極とよりなり
、該補助磁極と主磁極とを磁気的に結合させて磁気閉回
路を形成するようにしたことを特徴とする垂直型磁気記
録再生装置。A rotating shilling having a main magnetic pole; a magnetic medium that travels along the rotation locus of the main magnetic pole while being in contact with the main magnetic pole for a predetermined period or more; and includes an auxiliary magnetic pole facing each other over most of the contact area between the magnetic medium and the main magnetic pole, and the auxiliary magnetic pole and the main magnetic pole are magnetically coupled to form a magnetic closed circuit. A perpendicular magnetic recording/reproducing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16916381A JPS5870414A (en) | 1981-10-22 | 1981-10-22 | Vertical type magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16916381A JPS5870414A (en) | 1981-10-22 | 1981-10-22 | Vertical type magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5870414A true JPS5870414A (en) | 1983-04-26 |
Family
ID=15881432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16916381A Pending JPS5870414A (en) | 1981-10-22 | 1981-10-22 | Vertical type magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5870414A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0110365A2 (en) * | 1982-11-29 | 1984-06-13 | Olympus Optical Co., Ltd. | Video tape recorder |
| EP0410804A2 (en) * | 1989-07-28 | 1991-01-30 | Kabushiki Kaisha Toshiba | Rotary head device |
-
1981
- 1981-10-22 JP JP16916381A patent/JPS5870414A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0110365A2 (en) * | 1982-11-29 | 1984-06-13 | Olympus Optical Co., Ltd. | Video tape recorder |
| EP0410804A2 (en) * | 1989-07-28 | 1991-01-30 | Kabushiki Kaisha Toshiba | Rotary head device |
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