JP2612847B2 - Rotating head drum of magnetic recording / reproducing device - Google Patents
Rotating head drum of magnetic recording / reproducing deviceInfo
- Publication number
- JP2612847B2 JP2612847B2 JP60275305A JP27530585A JP2612847B2 JP 2612847 B2 JP2612847 B2 JP 2612847B2 JP 60275305 A JP60275305 A JP 60275305A JP 27530585 A JP27530585 A JP 27530585A JP 2612847 B2 JP2612847 B2 JP 2612847B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- head
- drum
- heads
- shielding member
- 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 - Fee Related
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
- G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
-
- 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
- G11B5/10—Structure or manufacture of housings or shields for heads
- G11B5/11—Shielding of head against electric or magnetic fields
- G11B5/112—Manufacture of shielding device
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は磁気記録再生装置に関し、特に回転磁気ヘッ
ドによって映像信号等を記録し又は再生する磁気記録再
生装置の回転ヘッドドラムに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a rotary head drum of a magnetic recording / reproducing apparatus for recording or reproducing a video signal or the like by a rotary magnetic head.
従来の技術 従来、映像信号を記録再生する場合、輝度信号と色信
号を１つの磁気ヘッドで記録再生するのが一般的であ
る。しかし、近年高画質化を目的として輝度信号と色信
号を別々のヘッドで記録し、輝度信号と色信号をそれぞ
れ独立したトラックとして記録する方式が提案され実用
化されている。（例えばナショナルテクニカルレポート
VoL,28,No.3,1982年６月,P.−412,P.−443参照）この様
な（輝度（Ｙ）信号と色（Ｃ）信号を分離する）YC分離
方式においては、通常ＹヘッドとＣヘッドとを、回転ヘ
ッドドラムに取付ける際、第５図，第６図に示すように
至近距離（数mm以内）に配置される。2. Description of the Related Art Conventionally, when recording and reproducing a video signal, it is general to record and reproduce a luminance signal and a chrominance signal with one magnetic head. However, recently, for the purpose of improving image quality, a method of recording a luminance signal and a chrominance signal with separate heads and recording the luminance signal and the chrominance signal as independent tracks has been proposed and put to practical use. (Eg National Technical Report
VoL, 28, No. 3, June 1982, P.-412, P.-443) In such a YC separation system (separating the luminance (Y) signal and the color (C) signal), When the Y head and the C head are mounted on the rotating head drum, they are arranged at a close distance (within several mm) as shown in FIGS.
従ってY,C2つのヘッドは同一のヘッドベースに取付け
られ、コンビネーションヘッドとする場合が一般的であ
る。ここで第５図はヘリカルスキャン型ヘッドドラムの
概要を示す斜視図である。回転ヘッドドラム１は固定ド
ラム２と同軸に配置され、コンビネーションヘッド（以
下コンビヘッドと呼ぶ）３は回転ヘッドドラム１に取付
けられて回転する。第６図はコンビヘッド３が回転ヘッ
ドドラム１に取付けられた状態を示す下面図であり、ヘ
ッド4aと4bはヘッドベース５にそれぞれ固着され、更に
ヘッドベース５は回転ヘッドドラム１に取付けられてい
る。Therefore, it is general that the two heads Y and C are mounted on the same head base and are used as a combination head. Here, FIG. 5 is a perspective view showing an outline of a helical scan type head drum. The rotary head drum 1 is arranged coaxially with the fixed drum 2, and a combination head (hereinafter, referred to as a combination head) 3 is attached to the rotary head drum 1 and rotates. FIG. 6 is a bottom view showing a state in which the combination head 3 is mounted on the rotary head drum 1. The heads 4a and 4b are respectively fixed to the head base 5, and the head base 5 is mounted on the rotary head drum 1. I have.
発明が解決しようとする問題点 YC分離方式において更に高密度記録、高SN比を達成し
ようとする時、メタルテープ及び金属ヘッドを採用する
必要があるが、この場合従来問題とならなかったヘッド
間のクロストークが障害となってSN比を劣化させる。Problems to be Solved by the Invention In order to achieve higher density recording and higher SN ratio in the YC separation system, it is necessary to employ a metal tape and a metal head. Crosstalk becomes an obstacle and degrades the S / N ratio.
第７図及び第８図に従来構成のヘッド近傍における拡
大正面図，拡大下面図を示す。ヘッド4a,及び4bはヘッ
ドコア7a,7bとヘッド巻線6a,6bより構成されている。ヘ
ッド4aで記録すべき信号の記録電流をヘッド巻線6aに流
した時、漏洩磁束によりヘッド4bの巻線6bに電流が誘起
され、又逆にヘッド4bで記録すべき信号の記録電流がヘ
ッド4aのヘッド巻線6aに誘起される。この結果、本来記
録すべき信号以外の信号が混入された状態で磁気テープ
上に記録され、再生時に於ても同様の現象が誘起され、
SN比を劣化させる大きな要因となる。従来の構成におい
てはヘッド間クロストークが−50dB程度である。しかし
ながら高画質化を実現するには−60dB以上必要とするこ
とが判った。7 and 8 show an enlarged front view and an enlarged bottom view in the vicinity of the head of the conventional configuration. The heads 4a and 4b are composed of head cores 7a and 7b and head windings 6a and 6b. When a recording current of a signal to be recorded by the head 4a is applied to the head winding 6a, a current is induced in the winding 6b of the head 4b by the leakage magnetic flux, and conversely, the recording current of the signal to be recorded by the head 4b is Induced by the head winding 6a of 4a. As a result, signals are recorded on the magnetic tape in a state in which signals other than the signals to be originally recorded are mixed, and a similar phenomenon is induced during reproduction,
This is a major factor that degrades the SN ratio. In the conventional configuration, crosstalk between heads is about -50 dB. However, it was found that -60 dB or more was required to achieve high image quality.
本発明は上記問題点に鑑み、ヘッド間クロストークを
減少し高画質化を実現するようにした磁気記録再性装置
の回転ヘッドドラムを提供するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a rotary head drum of a magnetic recording reproducible device that reduces crosstalk between heads and achieves high image quality.
問題点を解決するための手段 上記問題点を解決するために本発明の磁気記録再生装
置の回転ヘッドドラムは回転磁気ヘッドによって信号を
記録再生するための回転ヘッドドラムであって、回転ド
ラム上に取付けられ、かつ至近距離に配置してそれぞれ
異なる信号を記録再生する一対の磁気ヘッドと、該一対
の磁気ヘッドの間に設けられた、Ｌ字形又はＴ字形に折
曲げられた磁気しゃへい部材とを備えたものである。Means for Solving the Problems In order to solve the above problems, the rotating head drum of the magnetic recording / reproducing apparatus of the present invention is a rotating head drum for recording / reproducing a signal by a rotating magnetic head. A pair of magnetic heads mounted and arranged at a close distance to record and reproduce different signals, and a magnetic shielding member provided between the pair of magnetic heads and bent into an L-shape or T-shape. It is provided.
作用 本発明は上記した構成によって、磁気ヘッドの間に設
けられた磁気しゃへい部材が各磁気ヘッドから漏れ出る
漏洩磁束を遮断し、磁気ヘッド間のクロストークを十分
に低減するものである。According to the present invention, with the above-described configuration, the magnetic shielding member provided between the magnetic heads blocks the leakage magnetic flux leaking from each magnetic head, thereby sufficiently reducing the crosstalk between the magnetic heads.
実 施 例 以下本発明の実施例を図面により説明する。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示すものでヘッド近傍の
拡大正面図である。第２図は第１図の下方向からみた下
面図である。第１図および第２図において、ヘッド4a,4
bはヘッドベース５に接着され、コンビヘッドを形成し
ている。6a,6bは各ヘッドの巻線、7a,7bはヘッドコアを
示している。FIG. 1 shows an embodiment of the present invention and is an enlarged front view near the head. FIG. 2 is a bottom view as viewed from below in FIG. 1 and 2, the heads 4a, 4
b is bonded to the head base 5 to form a combination head. 6a and 6b indicate windings of each head, and 7a and 7b indicate head cores.
磁気しゃへい部材８は材質がパーマロイよりなる薄板
材でＬ字形の形状をなし、回転ヘッドドラム１に接着さ
れている。Ｌ字形磁気しゃへい部材８の一端はヘッド4a
と4bの間で延長され、衝立で仕切った状態になってい
る。一方回転ヘッドドラム１に接着される部分は若干台
形状をなし、ドラム外周面より50μｍ程度内側に接着さ
れ、実際に磁気テープが回転ヘッドドラム１に巻付けら
れた時、磁気しゃへい部材８は磁気テープに接触しない
よう配置される。The magnetic shielding member 8 is made of a thin plate made of permalloy and has an L-shape, and is adhered to the rotary head drum 1. One end of the L-shaped magnetic shielding member 8 is a head 4a.
And 4b, and are partitioned by partitions. On the other hand, the portion bonded to the rotary head drum 1 has a slightly trapezoidal shape and is bonded about 50 μm inside the drum outer peripheral surface. When the magnetic tape is actually wound around the rotary head drum 1, the magnetic shielding member 8 It is arranged so as not to touch the tape.
上記構成において、各ヘッド4a,4bでそれぞれ異なる
信号の記録電流を各ヘッド巻線6a,6bに流した時、ヘッ
ドコア7a,7bから洩れ出る漏洩磁束は磁気しゃへい部材
８によってそれぞれ遮断され各ヘッド4a,4b間における
クロストークは著しく減少する。In the above configuration, when a recording current of a different signal is applied to each of the head windings 6a, 6b in each of the heads 4a, 4b, the leakage magnetic flux leaking from the head cores 7a, 7b is cut off by the magnetic shielding member 8, and each of the heads 4a, 4b is blocked. , 4b, the crosstalk is significantly reduced.
次に、他の実施例を説明すると、第３図の正面図第４
図の下面図に示すようにＬ字形の磁気しゃへい部材８を
２ケ対称形に配置し全体としてＴ字形をなしている。本
実施例では各ヘッド4a,4bの上部を磁気しゃへい部材８
により覆うこととなり前述の実施例に対し、更に磁気し
ゃへい作用は向上する。Next, another embodiment will be described.
As shown in the bottom view of the figure, two L-shaped magnetic shielding members 8 are arranged symmetrically to form a T-shape as a whole. In this embodiment, the upper part of each of the heads 4a and 4b is
As a result, the magnetic shielding action is further improved as compared with the above embodiment.
以上の各実施例では、しゃへい部材８をＬ字形又はＴ
字形にして、ヘッド4a、4bのうち少なくとも一方の上に
折曲げることにより十分なしゃへい効果が得られる。も
し、この折曲げ部分の無いしゃへい部材で同様のしゃへ
い効果を得ようとすると、しゃへい部材を下方に高く延
ばさなければならず、そのため、コンビヘッドが大型に
なってしまうという不都合がある。したがって、上記各
実施例では、このような折曲げ部分の無いしゃへい部材
と比較して、コンビヘッドを大型にしなくても十分なし
ゃへい効果が得られるのである。In each of the above embodiments, the shielding member 8 is L-shaped or T-shaped.
A sufficient shielding effect can be obtained by folding it over at least one of the heads 4a and 4b in the shape of a letter. If a similar shielding effect is to be obtained with a shielding member having no bent portion, the shielding member must be extended downward and high, and there is a disadvantage that the combination head becomes large. Therefore, in each of the above embodiments, a sufficient shielding effect can be obtained without increasing the size of the combination head, as compared with the shielding member having no bent portion.
なお磁気しゃへい部材８の材質は磁性材料であれば良
い。The material of the magnetic shielding member 8 may be a magnetic material.
発明の効果 以上の構成より明らかなように本発明はコンビヘッド
を形成するヘッドの間にＬ字形又はＴ字形に折曲げられ
た磁気しゃへい部材を設けることにより、磁気しゃへい
部材を高くしなくてもヘッド間のクロストークを大幅に
低減させる効果があり、SN比の向上に著しく寄与するも
のである。さらに、本発明は、磁気しゃへい部材と磁気
ヘッドとを一体的に形成する必要がなく、磁気ヘッドの
構造および取付けを複雑にすることなく、磁気しゃへい
部材を回転ドラム上に単独で取付けるので簡単な構成お
よび工程にすることができ、その実用的効果は、非常に
大きい。Effect of the Invention As is clear from the above configuration, the present invention provides an L-shaped or T-shaped bent magnetic shielding member between heads forming a combination head, so that the magnetic shielding member does not need to be high. This has the effect of greatly reducing crosstalk between heads, and significantly contributes to the improvement of the SN ratio. Further, the present invention does not require the magnetic shielding member and the magnetic head to be integrally formed, and allows the magnetic shielding member to be mounted alone on the rotating drum without complicating the structure and mounting of the magnetic head. It can be configured and processed, and its practical effect is very large.
第１図は本発明の一実施例における磁気記録再生装置の
回転ヘッドドラムのヘッド近傍の正面図、第２図は同下
面図、第３図は本発明の他の実施例における磁気記録再
生装置の回転ヘッドドラムのヘッド近傍の正面図、第４
図は同下面図、第５図はヘリカルスキャン型ヘッドドラ
ムの斜視図、第６図は従来の回転ヘッドドラムを示す下
面図、第７図は従来の回転ヘッドドラムのヘッド近傍の
正面図、第８図は同下面図である。 １……回転ヘッドドラム、３……コンビヘッド、4a,4b
……ヘッド、５……ヘッドベース、6a,6b……ヘッド巻
線、7a,7b……ヘッドコア、８……磁気しゃへい部材。FIG. 1 is a front view showing the vicinity of the head of a rotary head drum of a magnetic recording / reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a bottom view thereof, and FIG. Front view near the head of the rotary head drum of FIG.
5 is a perspective view of a helical scan type head drum, FIG. 6 is a bottom view showing a conventional rotary head drum, FIG. 7 is a front view of the vicinity of the head of the conventional rotary head drum, FIG. FIG. 8 is a bottom view of the same. 1 ... rotating head drum, 3 ... combi head, 4a, 4b
... head, 5 ... head base, 6a, 6b ... head winding, 7a, 7b ... head core, 8 ... magnetic shielding member.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ▲吉▼田 隆泰 門真市大字門真1006番地 松下電器産業 株式会社内 (56)参考文献 特開 昭58−114327（ＪＰ，Ａ) 特開 昭60−219616（ＪＰ，Ａ) 実開 昭48−92909（ＪＰ，Ｕ) 実開 昭56−136333（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor ▲ Yoshi ▼ Takayasu 1006 Kazuma Kadoma, Matsushita Electric Industrial Co., Ltd. (56) References JP-A-58-114327 (JP, A) JP-A-60- 219616 (JP, A) Fully open 48-92909 (JP, U) Fully open, 56-136333 (JP, U)
Claims (2)
るための回転ヘッドドラムであって、前記回転ドラム上
に取付けられ、かつ至近距離に配置してそれぞれ異なる
信号を記録再生する一対の磁気ヘッドと、該一対の磁気
ヘッドの間に一片が位置し他の一片が少なくとも一方の
磁気ヘッドの磁気コアの側面を取り囲むように折曲げら
れ、かつ前記回転ドラム上に取付けられたＬ字形又はＴ
字形の磁気しゃへい部材とを有してなり、前記磁気しゃ
へい部材により上記各ヘッドに伝達する漏れ磁束を除去
するように構成したことを特徴とする磁気記録再生装置
の回転ヘッドドラム。1. A rotary head drum for recording and reproducing signals by a rotary magnetic head, comprising: a pair of magnetic heads mounted on the rotary drum and arranged at a close distance to record and reproduce different signals. An L-shape or T-shape in which one piece is located between the pair of magnetic heads and the other piece is bent so as to surround the side surface of the magnetic core of at least one of the magnetic heads, and is mounted on the rotating drum;
A rotary head drum for a magnetic recording / reproducing apparatus, comprising: a magnetic shielding member having a V-shape, wherein the magnetic shielding member is configured to remove a leakage magnetic flux transmitted to each of the heads.
半径方向に50μｍ以上内側に取付けられていることを特
徴とする特許請求の範囲第１項記載の磁気記録再生装置
の回転ヘッドドラム。2. The rotary head drum according to claim 1, wherein the magnetic shielding member is mounted at least 50 μm radially inward from the outer peripheral surface of the rotary drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60275305A JP2612847B2 (en) | 1985-12-06 | 1985-12-06 | Rotating head drum of magnetic recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60275305A JP2612847B2 (en) | 1985-12-06 | 1985-12-06 | Rotating head drum of magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62134816A JPS62134816A (en) | 1987-06-17 |
| JP2612847B2 true JP2612847B2 (en) | 1997-05-21 |
Family
ID=17553583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60275305A Expired - Fee Related JP2612847B2 (en) | 1985-12-06 | 1985-12-06 | Rotating head drum of magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2612847B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6482315A (en) * | 1987-09-25 | 1989-03-28 | Toshiba Corp | Rotary magnetic head device |
| JPH0268701A (en) * | 1988-08-22 | 1990-03-08 | Internatl Business Mach Corp <Ibm> | Magnetic head |
| JPH0337818A (en) * | 1989-07-05 | 1991-02-19 | Hitachi Ltd | Rotary magnetic head assembly |
| KR0170118B1 (en) * | 1995-12-29 | 1999-04-15 | 배순훈 | Head drum of tape recorder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8105831A (en) * | 1981-12-24 | 1983-07-18 | Philips Nv | ROTATABLE COPY UNIT. |
| JPS60219616A (en) * | 1984-04-13 | 1985-11-02 | Tokyo Electric Co Ltd | Magnetic head holder |
-
1985
- 1985-12-06 JP JP60275305A patent/JP2612847B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62134816A (en) | 1987-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |