JPH02203459A - Rotary magnetic head device - Google Patents

Rotary magnetic head device

Info

Publication number
JPH02203459A
JPH02203459A JP1024326A JP2432689A JPH02203459A JP H02203459 A JPH02203459 A JP H02203459A JP 1024326 A JP1024326 A JP 1024326A JP 2432689 A JP2432689 A JP 2432689A JP H02203459 A JPH02203459 A JP H02203459A
Authority
JP
Japan
Prior art keywords
magnetic tape
tape
drum
vibration
outer circumferential
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
Application number
JP1024326A
Other languages
Japanese (ja)
Inventor
Hisahiro Tanaka
久博 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1024326A priority Critical patent/JPH02203459A/en
Publication of JPH02203459A publication Critical patent/JPH02203459A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the vibration of a magnetic tape produced in its width direction by using an elastic substance having the vibration attenuating performance to form a projection which separates the magnetic tape from the outer circumferential surface of a rotary drum. CONSTITUTION:An elastic substance having high vibration attenuating performance is used to form a projecting piece 80 having a wedge-shaped cross section and containing a single sine wave-shaped projection 8A formed in a body at a prescribed position on the surface. The piece 80 is set free only when a magnetic tape 6 is separated from both drums 2 and 1 and at the same time fitted to a slant cut part 10 formed to a fixed drum 1 at a position near a cross mark where the vibration of the tape 6 is started. Then the piece 80 is fixed to the drum 1 in one body. Thus it is possible to absorb the vibration produced in the width direction of the tape 6 due to the difference of the tensile force generated by the projection 8A in the width direction of the tape 6 since the elastic substance having the vibration attenuating performance is used to the projection 8A which functions to separate the tape 6 from the outer circumferential surface of the drum 2.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、磁気テープを固定ドラムの外周面に所定角
度で斜め走行させるとともに、ビデオヘッドで走査する
ようにした「ヘリカルスキャン方式」のビデオテープレ
コーダ(以下rVTRJという)等に用いられる回転磁
気ヘッド装置に関するもので、特に回転ドラムの外周面
とに跨って磁る。
[Detailed Description of the Invention] [Industrial Application Field] The present invention is a "helical scan type" video tape in which a magnetic tape is run obliquely at a predetermined angle on the outer peripheral surface of a fixed drum and is scanned by a video head. This relates to a rotating magnetic head device used in a tape recorder (hereinafter referred to as rVTRJ), etc., and in particular, the magnetic head is magnetized across the outer peripheral surface of a rotating drum.

〔従来の技術〕[Conventional technology]

第5図および第6図は、たとえば実開昭61−4844
6号公報に開示されている従来の回転磁気ヘッド装置を
示す斜視図と、要部を切欠いて示す正面図である。
Figures 5 and 6 are, for example, Utility Model Application No. 61-4844.
FIG. 6 is a perspective view showing a conventional rotary magnetic head device disclosed in Publication No. 6, and a front view showing a main part thereof cut away.

同図において、(1)は固定ドラムで、VTRのシャー
シ(図示せず)上の所定位置に取り付けられており、こ
の固定ドラム(1)の上面には駆動モータ(図示せず)
により所定速度で矢印fA)の方向に回転駆動される回
転ドラム(2)が間隙(Gl)をあけて同心的に配設さ
れている。なお、上記回転ドラム(2)と、固定ドラム
+1)の外表面はいずれもアルミ系の材料を酸化加工し
て硬質アルマイト処理が施されている。 (3) 、 
(4)は一対の磁気ヘッドで、上記固定ドラム(1)の
下縁部に対応して回転ドラム(2)の下縁部の一部に形
成された窓部(5)から突出され、磁気テープ(6)に
摺接して映像信号の記録または再生を行なう。
In the figure, (1) is a fixed drum, which is attached to a predetermined position on the chassis (not shown) of the VTR, and a drive motor (not shown) is mounted on the upper surface of this fixed drum (1).
Rotating drums (2) which are driven to rotate at a predetermined speed in the direction of arrow fA) are arranged concentrically with a gap (Gl) between them. The outer surfaces of the rotating drum (2) and the fixed drum +1) are both hard alumite-treated by oxidizing aluminum-based material. (3),
(4) is a pair of magnetic heads, which protrude from a window (5) formed in a part of the lower edge of the rotating drum (2) corresponding to the lower edge of the fixed drum (1), and are magnetic. It slides into contact with the tape (6) to record or reproduce video signals.

(7)はテープガイドで、上記固定ドラム(1)の外周
面に所定角度(約3°)に傾斜して形成され、磁気テー
プ(5)が回転ドラム(2)と、固定ドラム(1)とに
跨って常に一定の角度で傾斜した状態で両ドラム(1)
、(2)の外周面に沿って矢印+B)の方向に走行する
ようにガイドするために設けられたものである。 (8
)は正弦波状の単一の突起で、回転ドラム(2)の下縁
部外周面に対応して、固定ドラムfi+の上縁部の外周
面所定位置に40〜50μmの高さで形成されている。
(7) is a tape guide, which is formed on the outer peripheral surface of the fixed drum (1) at a predetermined angle (approximately 3 degrees), and the magnetic tape (5) is connected to the rotating drum (2) and the fixed drum (1). Both drums (1) are always tilted at a constant angle across the
, (2) is provided to guide the vehicle to run in the direction of arrow +B) along the outer circumferential surface of the vehicle. (8
) is a single sinusoidal protrusion, which is formed at a height of 40 to 50 μm at a predetermined position on the outer circumferential surface of the upper edge of the fixed drum fi+, corresponding to the outer circumferential surface of the lower edge of the rotating drum (2). There is.

上記突起(8)の形成位置は、第5図に示すように、回
転ドラム(2)と、固定ドラムTll とに跨って、こ
の両ドラム(]) 、 (2)の外周面に約180@の
角度で巻付けられて矢印(B)の方向に向って走行する
磁気テープ(6)が、両ドラム(2)、(+)から離脱
し始めてフリーとなり、かつこの磁気テープ(6)の振
動の起点となる固定ドラム(1)の「xj印位置の近傍
であり、また、この突起(8)は、第8図の動作説明図
で示すように、両ドラム(1)。
As shown in FIG. 5, the protrusion (8) is formed on the outer circumferential surface of both the rotating drum (2) and the fixed drum (Tll) by about 180@ The magnetic tape (6), which is wound at an angle of This protrusion (8) is near the "xj" mark position of the fixed drum (1), which is the starting point for both drums (1), as shown in the operation explanatory diagram of FIG.

(2)の外周面に摺接しながら走行している磁気テープ
(6)の回転ドラム(2)側のテープ縁部(5a)のみ
を回転ドラム(2)の外周面から離脱させて両磁気ヘッ
ド(31,(4)と衝突しないように間隙(G3)を形
成して磁気テープ(6)の振動を防止するために設けら
れたものである。なお、磁気テープ(6)と、この磁気
テープ(6)が摺接する両ドラム(1)。
Only the tape edge (5a) on the rotating drum (2) side of the magnetic tape (6), which is running while sliding in contact with the outer circumferential surface of the rotating drum (2), is separated from the outer circumferential surface of the rotating drum (2). (31, (4)) to prevent vibration of the magnetic tape (6) by forming a gap (G3) so as not to collide with the magnetic tape (6). (6) are in sliding contact with both drums (1).

(2)の外周面との間には磁気テープ(6)の高速走行
と、両ドラム(1)12)の高速回転によってエアギャ
ップが生じて磁気ヘッド(3) 、 (4)と磁気テー
プ(6)との衝突を多少緩和するが磁気テープ(6)の
振動を防止する効果は少ない。
An air gap is created between the magnetic head (3), (4) and the outer peripheral surface of the magnetic tape (2) due to the high-speed running of the magnetic tape (6) and the high-speed rotation of both drums (1) and the magnetic tape (12). 6), but the effect of preventing vibration of the magnetic tape (6) is small.

したがって、上記磁気テープ(6)の振動が作動中の磁
気ヘッド(3) 、 (4)と、磁気テープ(6)との
摺接部に伝達されて、いわゆる「インパクトエラー」が
発生し、記録特性および再生特性が劣化するようなこと
がない。
Therefore, the vibration of the magnetic tape (6) is transmitted to the sliding contact between the operating magnetic heads (3), (4) and the magnetic tape (6), causing a so-called "impact error" and recording. There is no deterioration in characteristics and reproduction characteristics.

[発明が解決しようとする課題〕 従来の回転磁気ヘッド装置は以上のように構成されてい
るので、両ドラム(+1.(2)の外周面に摺接しなが
ら走行している磁気テープ(6)の回転ドラム(2)側
のテープ縁部(6a)を、固定ドラム(1)、に設けた
突起(8)によって回転ドラム(2)の外周面から離脱
させることによって、回転ドラム(2)の外周面から突
出する磁気ヘッド(3)、(4)と、磁気テープ(6)
との衝突を回避して磁気テープ(6)の振動を防止する
ことができるとしても、第7図および第8図に示すよう
に、固定ドラム(1)の突起(8)によって磁気テープ
(6)の回転ドラム(2)側のテープ縁部(6a)のみ
を回転ドラム(2)の外周面から離脱させるために、キ
ャプスタンとピンチローラ(いずれも図示せず)による
磁気テープ(6)に対する走行方向の引っ張り力は、突
起(8)によって回転ドラム(2)の外周面から引き離
すように強引に離脱された回転ドラム(2)側のテープ
縁部(6a)が強く、固定ドラム(1)の外周面に摺接
したままのテープ縁部(6b)が弱い。
[Problems to be Solved by the Invention] Since the conventional rotary magnetic head device is configured as described above, the magnetic tape (6) is running while slidingly contacting the outer peripheral surfaces of both drums (+1.(2)). The tape edge (6a) on the rotating drum (2) side of the rotating drum (2) is separated from the outer peripheral surface of the rotating drum (2) by the protrusion (8) provided on the fixed drum (1). Magnetic heads (3), (4) protruding from the outer peripheral surface and magnetic tape (6)
Even if it is possible to prevent the vibration of the magnetic tape (6) by avoiding collision with the magnetic tape (6), as shown in FIGS. ) to detach only the tape edge (6a) on the rotating drum (2) side from the outer peripheral surface of the rotating drum (2), a capstan and a pinch roller (none of which are shown) are applied to the magnetic tape (6). The tensile force in the traveling direction is strong at the tape edge (6a) on the rotating drum (2) side, which is forcibly separated from the outer peripheral surface of the rotating drum (2) by the protrusion (8), and The tape edge (6b) that remains in sliding contact with the outer peripheral surface of the tape is weak.

つまり、磁気テープ(6)の巾方向の引っ張り力に大き
い差違があるため、固定ドラム(1)の突起(8)から
ガイドローラ(9)までの間を走行する磁気テープ(6
)は、これの巾方向に振動し易<、シかもこの磁気テー
プ(6)の振動が作動中の磁気ヘッド+3) 、 (4
)と、磁気テープ(6)との摺接部に伝達されて記録特
性および再生特性の低下を招く問題点があった。
In other words, since there is a large difference in the tensile force in the width direction of the magnetic tape (6), the magnetic tape (6) running between the protrusion (8) of the fixed drum (1) and the guide roller (9)
) is likely to vibrate in the width direction of the magnetic tape (6).
) and to the sliding contact portion with the magnetic tape (6), resulting in a problem of deterioration of recording and reproduction characteristics.

この発明は、上記のような問題点を改善するためになさ
れたもので、磁気テープを回転ドラムの外周面から離脱
させて磁気テープの振動を防止するための突起を固定ド
ラムの外周面に形成したものにおいて、この突起による
磁気テープに対する巾方向の引っ張り力の差異によって
磁気テープが巾方向に振動しないようにした回転磁気ヘ
ッド装置を得ることを目的とする。
This invention was made in order to improve the above-mentioned problems, and involves forming protrusions on the outer circumferential surface of the fixed drum to prevent the vibration of the magnetic tape by separating the magnetic tape from the outer circumferential surface of the rotating drum. An object of the present invention is to provide a rotating magnetic head device in which the magnetic tape is prevented from vibrating in the width direction due to a difference in the tensile force of the protrusions on the magnetic tape in the width direction.

〔課題を解決するための手段〕[Means to solve the problem]

この発明による回転磁気ヘッド装置は、固定ドラムと回
転ドラムの外周面に跨って摺接する磁気テープの回転ド
ラム側のテープ縁部を上記回転ドラムの外周面から離脱
させる突起を、振動減衰性を有する弾性体で構成したも
のである。
In the rotating magnetic head device according to the present invention, the protrusion that separates the tape edge on the rotating drum side of the magnetic tape that is in sliding contact across the outer circumferential surfaces of the fixed drum and the rotating drum from the outer circumferential surface of the rotating drum has a vibration damping property. It is made of elastic material.

〔作用〕[Effect]

この発明によれば、磁気テープを回転ドラムの外周面か
ら離脱させる突起を、振動減衰性を有する弾性体で構成
したので、上記突起による磁気テープに対する巾方向の
引っ張り力の差異によって磁気テープが巾方向に振動す
るようなことがない。
According to this invention, the protrusions for separating the magnetic tape from the outer circumferential surface of the rotating drum are made of an elastic material having vibration damping properties, so that the width of the magnetic tape is reduced due to the difference in the tensile force in the width direction of the magnetic tape due to the protrusions. There is no vibration in any direction.

〔実施例〕〔Example〕

以下、この発明の一実施例を図面にもとづいて説明する
Hereinafter, one embodiment of the present invention will be described based on the drawings.

第1図は、この発明の一実施例による回転磁気ヘッド装
置を示す斜視図、第2図および第3図は固定ドラムの斜
視図であり、同図において、第5図に示す従来のものと
同一または相当部分には、同一の符号を付して、その詳
細な説明は省略する。
FIG. 1 is a perspective view showing a rotating magnetic head device according to an embodiment of the present invention, and FIGS. 2 and 3 are perspective views of a fixed drum. Identical or corresponding parts are given the same reference numerals, and detailed explanation thereof will be omitted.

(80)は第3図に示すように、表面所定位置に正弦波
状の単一の突起(8A)を一体形成した断面楔状の突起
片で、この突起片(80)は振動減衰性の高いたとえば
ゴムまたは軟質合成樹脂等の弾性体で構成されており、
また、この突起片(8)は、第1図に示すように磁気テ
ープ(6)が両ドラム(2)、(1)から離脱し始めて
フリーとなり、かつこの磁気テープ(6)の振動の起点
となる固定ドラム(11の「×」印位置の近傍に形成さ
れた傾斜切欠部(10)に嵌合され、たとえば接着剤に
よって第2図に示すように固定ドラム(1)に一体に固
着されている。
As shown in FIG. 3, (80) is a protrusion piece with a wedge-shaped cross section that has a single sinusoidal protrusion (8A) integrally formed at a predetermined position on its surface. It is composed of an elastic body such as rubber or soft synthetic resin.
Moreover, as shown in FIG. 1, this protruding piece (8) becomes free when the magnetic tape (6) begins to separate from both drums (2) and (1), and is the starting point of vibration of this magnetic tape (6). It is fitted into the inclined notch (10) formed near the "x" mark position of the fixed drum (11) and is fixed integrally to the fixed drum (1) with adhesive, for example, as shown in FIG. ing.

以上のように構成された回転磁気ヘッド装置によれば、
磁気テープ(6)を回転ドラム(2)の外周面から離脱
させる突起(8A)を、振動減衰性を有する弾性体で構
成するようにしたので、上記突起(8A)による磁気テ
ープ(6)に対する巾方向の引っ張り力の差異によって
発生するこの磁気テープ(6)の巾方向の振動が吸収さ
れる。
According to the rotating magnetic head device configured as described above,
Since the protrusion (8A) for separating the magnetic tape (6) from the outer peripheral surface of the rotating drum (2) is made of an elastic material having vibration damping properties, the protrusion (8A) causes the magnetic tape (6) to Vibration in the width direction of the magnetic tape (6) caused by the difference in tensile force in the width direction is absorbed.

また、上記一実施例においては、突起片(80)の突起
(8A)を、磁気テープ(6)が両ドラム(21,(+
1から離脱し始める固定ドラム(1)の「Xj印位置の
近傍にのみ突出させた場合について説明したが、第4図
に示す他の実施例のように、突起片(80)の突起(8
A)を、両ドラム(2)、(+1の外周面に磁気テープ
(6)を巻付ける範囲(約180°)の長さにわたって
固定ドラム(1)の上縁部に長く形成するようにすれば
、磁気テープ(6)の振動を更に有効に吸収することが
可能となる。
Further, in the above embodiment, the magnetic tape (6) connects the protrusion (8A) of the protrusion piece (80) with both drums (21, (+).
Although the explanation has been given on the case where the fixed drum (1) is protruded only in the vicinity of the "Xj" mark position where it starts to separate from
A) is formed long on the upper edge of the fixed drum (1) over the length of the range (approximately 180°) where the magnetic tape (6) is wound around the outer peripheral surface of both drums (2) and (+1). For example, vibrations of the magnetic tape (6) can be absorbed more effectively.

[発明の効果] 以上のように、この発明によれば、磁気テープを回転ド
ラムの外周面から離脱させる突起を、振動減衰性を有す
る弾性体で構成したので、上記突起による磁気テープに
対する巾方向の引っ張り力の差異によって磁気テープが
巾方向に振動するようなことがなく、常に良好な記録特
性および再生特性が維持できる効果を有する。
[Effects of the Invention] As described above, according to the present invention, the protrusions for separating the magnetic tape from the outer circumferential surface of the rotating drum are made of an elastic body having vibration damping properties, so that the protrusions prevent the magnetic tape from moving in the width direction. This has the effect that the magnetic tape does not vibrate in the width direction due to the difference in the tensile force between the two, and good recording and reproduction characteristics can always be maintained.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例による回転磁気ヘッド装置
の斜視図、第2図および第3図は固定ドラムの斜視図、
第4図はこの発明の他の実施例による固定ドラムの斜視
図、第5図は従来の回転磁気ヘッド装置を示す斜視図、
第6図は要部を切欠いて示す正面図、第7図は磁気テー
プの動作説明図、第8図は第7図の■−■線に沿う断面
図である。 +1)・・・固定ドラム、 (21−・・回転ドラム、
(3)。 (4) −・・磁気ヘッド、 (6)−・・磁気テープ
、(6a)・・・テープ縁部、(8A)・・・突起。 なお、図中、同一符号は同一または相当部分を示す。
FIG. 1 is a perspective view of a rotating magnetic head device according to an embodiment of the present invention, FIGS. 2 and 3 are perspective views of a fixed drum,
FIG. 4 is a perspective view of a fixed drum according to another embodiment of the present invention, and FIG. 5 is a perspective view of a conventional rotating magnetic head device.
FIG. 6 is a front view showing a main part cut away, FIG. 7 is an explanatory diagram of the operation of the magnetic tape, and FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. 7. +1)...Fixed drum, (21-...Rotating drum,
(3). (4) ---Magnetic head, (6) ---Magnetic tape, (6a) ---Tape edge, (8A) ---Protrusion. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] (1)外周面に磁気ヘッドを突設した回転ドラムと、こ
の回転ドラムに隣接してこれと同軸上に配設された固定
ドラムと、この固定ドラムの外周面に突設され上記両ド
ラムの外周面に跨つて摺接する磁気テープの回転ドラム
側のテープ縁部を上記回転ドラムの外周面から離脱させ
る突起とを具備し、上記突起を振動減衰性を有する弾性
体で構成してなる回転磁気ヘッド装置。
(1) A rotating drum with a magnetic head protruding from its outer circumferential surface, a fixed drum disposed adjacent to and coaxially with this rotating drum, and both drums protruding from the outer circumferential surface of this fixed drum. A rotating magnet comprising: a protrusion for separating the tape edge of the magnetic tape on the rotating drum side from the outer circumferential surface of the rotary drum, which slides over the outer circumferential surface of the magnetic tape; and the protrusion is made of an elastic body having vibration damping properties. head device.
JP1024326A 1989-02-01 1989-02-01 Rotary magnetic head device Pending JPH02203459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1024326A JPH02203459A (en) 1989-02-01 1989-02-01 Rotary magnetic head device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1024326A JPH02203459A (en) 1989-02-01 1989-02-01 Rotary magnetic head device

Publications (1)

Publication Number Publication Date
JPH02203459A true JPH02203459A (en) 1990-08-13

Family

ID=12135054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1024326A Pending JPH02203459A (en) 1989-02-01 1989-02-01 Rotary magnetic head device

Country Status (1)

Country Link
JP (1) JPH02203459A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526207A (en) * 1991-08-07 1996-06-11 Matsushita Electric Industrial Co., Ltd. Rotary head cylinder having a fixed cylinder projection generating a lifting force at a lower edge of a tape on the cylinder to increase an upper edge restricting force
US5999381A (en) * 1997-03-08 1999-12-07 Samsung Electronics Co., Ltd. Head drum assembly with vibration absorbing element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526207A (en) * 1991-08-07 1996-06-11 Matsushita Electric Industrial Co., Ltd. Rotary head cylinder having a fixed cylinder projection generating a lifting force at a lower edge of a tape on the cylinder to increase an upper edge restricting force
US5999381A (en) * 1997-03-08 1999-12-07 Samsung Electronics Co., Ltd. Head drum assembly with vibration absorbing element

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