JPS63173217A - Rotary drum device - Google Patents
Rotary drum deviceInfo
- Publication number
- JPS63173217A JPS63173217A JP371387A JP371387A JPS63173217A JP S63173217 A JPS63173217 A JP S63173217A JP 371387 A JP371387 A JP 371387A JP 371387 A JP371387 A JP 371387A JP S63173217 A JPS63173217 A JP S63173217A
- Authority
- JP
- Japan
- Prior art keywords
- head
- yoke
- drum device
- rotating drum
- tape
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 35
- 230000004907 flux Effects 0.000 claims abstract description 10
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は例えばビデオ・テープ・レコーダ(以下VT
Rと略記)に関し、特にVTRの再生画質を改善するた
めになされたもので、回転するドラムに設けられたビデ
オ・ヘッドを磁気テープの幅方向に移動可能となして磁
気記録跡を忠実にトレースさせるようにした回転ドラム
装置に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to, for example, a video tape recorder (hereinafter referred to as VT).
(abbreviated as "R") was developed specifically to improve the playback quality of VTRs.The video head mounted on a rotating drum was made movable in the width direction of the magnetic tape to faithfully trace the magnetic recording traces. The present invention relates to a rotating drum device configured to rotate.
第9図は従来の回転ドラム装置を示す断面図であり、図
において、(1)は回転軸、(2)は固定の下ドラム、
(3)は回転する上ドラム、(4)は上ドラム(3)に
脱着自在にイ・ジ止めされたヘッド台、(5)はヘッド
台(4)の先端に固着されたヘッド、(6)は下ドラム
(2)に対して回転軸(1)が自由に回転し得るように
なしたベアリング、(力は上ドラム(3)と共に回転す
る上トランス、(8)は静止した下トランス、(9)は
回転軸(1)に支持されていて上ドラム(3)を担持す
る台座、(13)は磁気テープである。FIG. 9 is a sectional view showing a conventional rotating drum device. In the figure, (1) is a rotating shaft, (2) is a fixed lower drum,
(3) is a rotating upper drum, (4) is a head stand that is detachably fixed to the upper drum (3), (5) is a head that is fixed to the tip of the head stand (4), (6 ) is a bearing that allows the rotating shaft (1) to rotate freely relative to the lower drum (2), (the upper transformer rotates with the upper drum (3), the lower transformer (8) is stationary, (9) is a pedestal that is supported by the rotating shaft (1) and carries the upper drum (3), and (13) is a magnetic tape.
ヘッド(5)は上ドラム(3)に対して固定した位置に
保持されており、その先端は上ドラム(3)の外周より
少し突出している。上ドラム(3)は一定の高速度で回
転せしめられる。かかる上ドラム(3)と下ドラム(2
)との外周面に磁気テープ(13)がやや斜めに巻き付
けられて所定の速度で走行する。かくしてヘッド(5)
は磁気テープ(13)に接触して磁気的に映像(または
音声)信号を記録または再生する。The head (5) is held at a fixed position relative to the upper drum (3), and its tip protrudes a little beyond the outer periphery of the upper drum (3). The upper drum (3) is rotated at a constant high speed. The upper drum (3) and lower drum (2)
) A magnetic tape (13) is wound slightly diagonally around the outer peripheral surface of the magnetic tape (13) and runs at a predetermined speed. Thus the head (5)
contacts the magnetic tape (13) to magnetically record or reproduce video (or audio) signals.
上トランス(力は台座(9)に取り付けられて台座(9
)と共に回転する。ヘッド(5)は接続部(10)、配
線板(11)、接続部(12)を経て上トランス(力に
接続されている。下トランス(8)は微少な間隔を置い
て上トランス(力に対面している。The upper transformer (power is attached to the pedestal (9)
). The head (5) is connected to the upper transformer (power) via the connection part (10), the wiring board (11), and the connection part (12).The lower transformer (8) is connected to the upper transformer (power) at a small interval. is facing.
上下トランス(7)、 T8)は磁気的に結合されてい
て信号を相互に伝達する。下トランス(8)は外部に設
けた信号処理装置(図示せず)に接続されている。The upper and lower transformers (7), T8) are magnetically coupled and mutually transmit signals. The lower transformer (8) is connected to an external signal processing device (not shown).
磁気テープ(13)の走行とヘッド(5)の回転により
ヘッド(5)は磁気テープ(13)を斜めに横切る。こ
れら横切り線は相互に平行になつ【いる。第10図はこ
のことを詳細に説明するための図である。図において、
(13a)は磁気テープ(13)の軌跡、(V、)は磁
気テープ(13)の通常の送り速度、(5a)はヘッド
(5)の軌跡、(V、)はヘッド(5)の回転速度であ
る。By running the magnetic tape (13) and rotating the head (5), the head (5) diagonally crosses the magnetic tape (13). These transverse lines are parallel to each other. FIG. 10 is a diagram for explaining this in detail. In the figure,
(13a) is the trajectory of the magnetic tape (13), (V,) is the normal feeding speed of the magnetic tape (13), (5a) is the trajectory of the head (5), (V,) is the rotation of the head (5) It's speed.
軌跡(13a)と軌跡(5a)とは図示の如く交差して
いる。かくしてヘッド(5)により磁気テープ(13)
に画かれる相対的軌跡(前記横切り線)は第10図(a
)に示す如くAとなる。ところで、磁気テープ(13)
の送り速度がVtからV、の如く増大せしめられる(例
えば高速リサーチ時)と、磁気テープ(13)に対する
ヘッド(5)の相対的軌跡は第10図(b)に示す如く
Bとなる。The trajectory (13a) and the trajectory (5a) intersect as shown. Thus, the magnetic tape (13) is moved by the head (5).
The relative locus (the above-mentioned crossing line) drawn in is shown in Fig. 10 (a
) as shown in A. By the way, magnetic tape (13)
When the feed speed is increased from Vt to V (for example, during high-speed research), the relative trajectory of the head (5) with respect to the magnetic tape (13) becomes B as shown in FIG. 10(b).
磁気テープ(13)は記録時の通常の送り速度(Vl)
とは異なる速度で再生されることがある。例えば静止、
スロー、高速リサーチ再生等である。このような場合の
、ヘッド(5)と磁気テープ(13)との相対的軌跡は
第10図(a)に示す通常時の相対的軌跡(A)からは
ずれ、例えば高速リサーチ再生時では第10図(blに
示す如き相対的軌跡(B)となる。つまり、ヘッド(5
)は通常送り速度での相対的軌跡(Alすなわち記録跡
を正確に追跡せず、そこからはずれるようになる。はず
れて来るとヘッド(5)が拾う信号レベルは低くなり、
鮮明な再生画像を得ることが困難になりノイズが発生す
るという問題があった。The magnetic tape (13) has a normal feed speed (Vl) during recording.
may be played at a different speed. For example, stationary
These include slow, high-speed research playback, etc. In such a case, the relative trajectory between the head (5) and the magnetic tape (13) deviates from the normal relative trajectory (A) shown in FIG. The relative trajectory (B) is as shown in the figure (bl).In other words, the head (5
) does not accurately track the relative trajectory (Al, that is, the recorded trace) at the normal feed speed, and begins to deviate from it. When it deviates from it, the signal level picked up by the head (5) becomes lower,
There was a problem in that it was difficult to obtain a clear reproduced image and noise was generated.
この発明は上記のような問題点を解決するためになされ
たもので、通常の送り速度(V、)の下で記録した磁気
テープ上の記録跡すなわち相対的軌跡(Alに対して、
再生時の磁気テープの送り速度を任意に変化させた場合
でも、ヘッド(5)が前記記録跡を正確に追跡(C)す
るよう(こなした回転ドラム装置を得ることを目的とす
る。This invention was made in order to solve the above-mentioned problems, and the recording trace, that is, the relative trajectory (relative to Al,
To provide a rotating drum device in which a head (5) can accurately track (C) the recording trace even when the feeding speed of a magnetic tape during reproduction is arbitrarily changed.
この発明に係る回転ドラム装置は、ヘッドをテープ幅方
向+T)に制御可能に移動させるようにしたものであり
、その特徴とするところは、回転するドラムに仮バネを
介してヘッドを装着してヘッドをテープ幅方向(T)に
可動となし、この板バネに円筒形コイルを取り付け、こ
の円筒形コイルに対して磁気的に反作用力をおよぼす円
柱形永久磁石を回転ドラムに固着し、前記円筒形コイル
に制御電流を通すために回転ドラムに回転する電極(ス
リップリング)を設け、このスリップリングに摺動接触
する接触子を外部に配置し、円柱形永久磁石をヨークで
囲みヘッドおよび磁気テープに妨害磁束か漏れないよう
にし、更にその内部に板バイ・を収納配置し、小形にし
たことである。The rotating drum device according to the present invention is configured to controllably move the head in the tape width direction +T), and is characterized by the head being attached to the rotating drum via a temporary spring. The head is movable in the tape width direction (T), a cylindrical coil is attached to this leaf spring, and a cylindrical permanent magnet that magnetically exerts a reaction force on the cylindrical coil is fixed to a rotating drum. A rotating electrode (slip ring) is provided on the rotating drum in order to pass a control current through the shaped coil, and a contactor that makes sliding contact with this slip ring is placed externally, and a yoke surrounds the cylindrical permanent magnet to connect the head and magnetic tape. This prevents the leakage of interfering magnetic flux, and furthermore, the board is housed inside, making it compact.
この発明瘉こおける回転ドラム装置は回転する電極を経
て外部より制御電流を円筒形コイルに加えることにより
磁気的にヘッドをテープの幅方向(T) fこ移動させ
、テープの記録跡に合わせる。The rotating drum device of this invention magnetically moves the head in the width direction (T) of the tape by applying a control current to the cylindrical coil from the outside via rotating electrodes to match the recording trace on the tape.
また板バネを駆動する円筒形コイルと円柱形永久磁石と
か共に回転するドラムに装着されるので、これらを駆動
部として一体化しユニットとなしうる。Further, since the cylindrical coil and the cylindrical permanent magnet that drive the leaf spring are both attached to the rotating drum, they can be integrated as a driving part to form a unit.
以下、この発明の一実施例を第1図乃至第8図について
説明する。第1図はこの発明による回転ドラム装置の主
要部を示す断面図、第2図はその平面図、第3図はこの
発明の主要部を更に詳細に示す平面図、第4図は第3図
の断面図、第5図は正面図である。これらの図において
(1)〜(3)、(5)〜(13)は従来の装置と同じ
部材を示す。第1図、第2図において、(4a)はヘッ
ド(5)を先端に固定していてヘッド(5)をテープの
幅方向に移動させるための駆動部である。An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. FIG. 1 is a sectional view showing the main part of a rotating drum device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a plan view showing the main part of the invention in more detail, and FIG. FIG. 5 is a front view. In these figures, (1) to (3) and (5) to (13) indicate the same members as in the conventional device. In FIGS. 1 and 2, (4a) is a drive unit that has a head (5) fixed at its tip and moves the head (5) in the width direction of the tape.
(50)は駆動部(4a)を収納するため上ドラム(3
)の一部に設けた凹所であり、駆動部(4a)を位置調
整するため−回り大きく形成している。(50) is an upper drum (3) for housing the drive unit (4a).
) is a recess provided in a part of the drive part (4a), and is formed with a large circumference in order to adjust the position of the drive part (4a).
駆動部を取り付けるための孔(48b)とその周囲に配
置された複数のヘッド位置調整用孔(51)とを上ドラ
ムに設ける。上ドラムの回転軸とヘッドとの中心線上に
前記孔(51)を−個(ハ)配置してヘッド突出し調整
用とし、前記中心線の両側に前記孔(51)の一対(イ
)、(ロ)を配置しこれらの孔(イ)、(ロ)間の中心
線は前記中心線(こ直交するようにしてヘッド円周位置
割出し調整用とし、直交する前記の交点と環状ギャップ
の中心点とを一致させかつ前記交点に対して前記の駆動
部取り付け用の孔(48b)を半径方向にすらせて配置
している。取付ネジ穴(48a)はヨーク(47)の中
心より距離lだけずらせて設けており、ヘッド位置調整
用孔(51)の(イ)、(ロ)へ棒などを用いてヨーク
(47)を押すことにより方向に)の位置決めを、孔(
51)の(ハ)により方向(ホ)の位置決めを行いヘッ
ド(5)を配置し4 シ(48)で固定する。なお(1
4)は駆動部(4a)に制御電流を供給するための回転
しない接触子、(15)は接触子(14)と摺動接触す
るように台座(9)の一部に設けた回転する電極、(1
6)は電極(15)から接続部(12)と配線板(11
)を経由して駆動部(’4 a ) +こ電気接続する
接続部である。ヘッド(5)は接続部(10)、配線板
(11)、接続部(12)を経て上トランス(力に電気
的に接続されている。The upper drum is provided with a hole (48b) for attaching the drive unit and a plurality of head position adjustment holes (51) arranged around the hole (48b). The holes (51) (c) are arranged on the center line between the rotating shaft of the upper drum and the head to adjust the head protrusion, and the holes (51) are arranged in pairs (a) and (c) on both sides of the center line. (b), and the center line between these holes (a) and (b) is orthogonal to the center line (for head circumference position index adjustment), and the center line of the annular gap is aligned with the orthogonal intersection point. The drive unit mounting hole (48b) is arranged so as to coincide with the intersection point and to slide in the radial direction with respect to the intersection point.The mounting screw hole (48a) is located at a distance l from the center of the yoke (47). By pushing the yoke (47) using a rod or the like, the position of the head position adjustment hole (51) can be adjusted by pushing the yoke (47) to (a) and (b) of the head position adjustment hole (51).
Position the head (5) in the direction (e) according to step (c) of 51), place the head (5), and fix it with the screw (48). Note (1
4) is a non-rotating contact for supplying control current to the drive unit (4a), and (15) is a rotating electrode provided on a part of the base (9) so as to be in sliding contact with the contact (14). , (1
6) from the electrode (15) to the connection part (12) and the wiring board (11)
) is a connection part that electrically connects to the drive part ('4 a ). The head (5) is electrically connected to the upper transformer (power) via a connection part (10), a wiring board (11), and a connection part (12).
第3図、第4図および第5図は駆動部(4a)を詳細に
示し、(41)は先端にヘッド(5)を取り付けた非磁
性体の板バ4、(43)は板バネ(41)に取り付けら
れたコイルボビン、(44)はコイルボビン(43)に
巻付けた駆動用の円i形コ(ル、(42)はコイルボビ
ン(43)を支持し板バ4(41)と共に変形すること
でコイルボビン(43)を直線運動可能にするための板
バネ、(45)は円柱形永久磁石、(46)は円柱形永
久磁石(45)と同一の磁極を対向させて配置した円柱
形永久磁石、(46a)は一対の円柱形永久磁石(45
)、 (46)の間に設けられた強磁性体のセンターポ
ール、(47)はヨークである。このヨーク(47)は
板バネ(41)。3, 4 and 5 show the drive unit (4a) in detail, (41) is a non-magnetic plate bar 4 with a head (5) attached to the tip, and (43) is a plate spring (4a). The coil bobbin (41) is attached to the coil bobbin, (44) is a driving circular I-shaped coil wound around the coil bobbin (43), and (42) supports the coil bobbin (43) and deforms together with the plate bar 4 (41). (45) is a cylindrical permanent magnet, and (46) is a cylindrical permanent magnet arranged with the same magnetic poles as the cylindrical permanent magnet (45) facing each other. The magnets (46a) are a pair of cylindrical permanent magnets (45
), (46) is a ferromagnetic center pole, and (47) is a yoke. This yoke (47) is a leaf spring (41).
(42)、円筒形コイル(44)、コイルボビン(43
)、一対の円柱形永久磁石(45)、(46)およびセ
ンターポール(46a)を収納保持しており、かつ収納
組立しやすいよう分割されてい【部分(47a)。(42), cylindrical coil (44), coil bobbin (43)
), a pair of cylindrical permanent magnets (45), (46), and a center pole (46a) are housed and held, and is divided into parts (47a) for easy storage and assembly.
(47b)、(470)からなっている。(48a)は
ヨーク(47)を上ドラムに取り付けて固定するための
ネジ穴である。(49)はヨーク(47)の一部に設け
られた窓である。この窓(49)を通ってヘッド(5)
が突出し、テープ(13)に摺動接触するよう上ド゛ラ
ムに配置される。なお円筒形コイル(44)ならびにコ
イルボビン(43)は一対の円柱形永久磁石(45)。It consists of (47b) and (470). (48a) is a screw hole for attaching and fixing the yoke (47) to the upper drum. (49) is a window provided in a part of the yoke (47). Head (5) through this window (49)
protrudes and is placed on the upper drum in sliding contact with the tape (13). Note that the cylindrical coil (44) and the coil bobbin (43) are a pair of cylindrical permanent magnets (45).
(46)およびセンターボー/l/ (46a )とヨ
ークとの間に形成された環状ギャップに上下に可動に配
置されている。また、板パー+(41)はヨーク(47
)の部分(47a)と(47b)との間に挟持され、板
バネ(42)は部分(47b)と(47c)との間に挾
持されている。(46) and the center bow /l/ (46a) are arranged in an annular gap formed between the yoke and the yoke so as to be movable up and down. Also, board par + (41) is yoke (47
) is held between parts (47a) and (47b), and the leaf spring (42) is held between parts (47b) and (47c).
第6図、第7図は板バネ(41)、(42)を詳細に示
す図であり、板バネ(41)はコイルボビン取付部(4
1a)と円弧状中間部(41b)とヨーク(47)の部
分(47g)、(47b)に挟まれて保持される円形の
外周部(41c)とからなる。コイルボビン取付部(4
1a)からヘッド取付部(41e)が延びている。円弧
状中間部(41b)には円弧状のスロットが設けられて
おり、半径方向(へ)に接続手を備えている。かかる円
弧状中間部(41b)がコイルボビン取付部(41g)
と円形外周部(41c)との間に対称的に少なくとも一
対配置され、その接続手によりコイルボビン取付部(4
1a)と円形外周部(41C)とを連結している。円形
外周部(41c)は外周の一部に回転方向につき位置決
めする切欠(41d)を有する。この切欠(41d)は
板バネ(41)がヨーク(47)に装着されるときヨー
ク内壁の凸部(図示省略)に嵌合して正確にヘッド(5
)が窓(49)より突出すように構成している。板バ4
(42)は板バネ(41)と同様にコイルボビン取付
部(42g)、円弧状中間部(42b)、円形外周部(
42c)、および切欠(42d)を有するが、この板バ
4(42)はヘッド取付部(41e)を有しないこと、
および円弧状中間部(42b)の接続手が半径方向(へ
)に対して90ずれた半径方向(ト)に在るように配置
されることの二点で板バネ(41)と異なる。かかる構
成によりコイルボビン(43)は上下方向のみに移動自
在に保持され、ヘッド(5)は方向チの回転をせず上下
にのみ直線運動可能である。FIG. 6 and FIG. 7 are views showing the leaf springs (41) and (42) in detail, and the leaf spring (41) is attached to the coil bobbin mounting portion (4).
1a), an arcuate intermediate portion (41b), and a circular outer peripheral portion (41c) held between portions (47g) and (47b) of the yoke (47). Coil bobbin mounting part (4
A head attachment portion (41e) extends from 1a). The arc-shaped intermediate portion (41b) is provided with an arc-shaped slot and provided with a connecting arm in the radial direction. This arcuate intermediate portion (41b) is the coil bobbin attachment portion (41g).
and the circular outer peripheral part (41c), and the coil bobbin mounting part (41c) is arranged symmetrically between the coil bobbin mounting part (41c) and
1a) and the circular outer peripheral portion (41C). The circular outer periphery (41c) has a notch (41d) on a part of the outer periphery for positioning in the rotational direction. When the leaf spring (41) is attached to the yoke (47), this notch (41d) fits into a convex part (not shown) on the inner wall of the yoke, so that the head (5
) is configured to protrude from the window (49). Board bar 4
(42), like the leaf spring (41), includes a coil bobbin attachment part (42g), an arcuate intermediate part (42b), and a circular outer peripheral part (
42c) and a notch (42d), but this plate bar 4 (42) does not have a head attachment part (41e);
It differs from the leaf spring (41) in two points: and the connecting end of the arcuate intermediate portion (42b) is arranged so as to be in the radial direction (T), which is shifted by 90 degrees from the radial direction (T). With this configuration, the coil bobbin (43) is held movable only in the vertical direction, and the head (5) is capable of linear movement only in the vertical direction without rotating in any direction.
第4図を参照して磁石(45)はヨーク(47)の部分
(47a)、(47b)とで作る閉磁路により磁束(D
)をセンターポール(46g)からヨークに向けて放射
状に発生している。同様に磁石(46)は部分(47b
)、(4’7c)とで逆向きの閉磁路を作り磁束(E)
を発生しており、磁束CD)および(E)は共に環状ギ
ャップを同一の方向に横切る。かくして円筒状コイル(
44)には磁石(45)と(46)の合計した磁束が横
切る。コイル(44)に接触子(14)から電極(15
)、接続部(12)、(16)を経て電流を流せば、コ
イル(44)とコイルボビン(43)とヘッド(5)は
一体となって上下に平行直線運動をする。かくしてヘッ
ド(5)がテープ幅方向に変位する。Referring to FIG. 4, the magnet (45) generates a magnetic flux (D
) are generated radially from the center pole (46g) toward the yoke. Similarly, the magnet (46) is connected to the part (47b
), (4'7c) create a closed magnetic path in the opposite direction and the magnetic flux (E)
, and the magnetic fluxes CD) and (E) both cross the annular gap in the same direction. Thus, the cylindrical coil (
44) is crossed by the total magnetic flux of magnets (45) and (46). The coil (44) is connected from the contact (14) to the electrode (15
), and the connecting parts (12) and (16), when a current is passed through the coil (44), coil bobbin (43), and head (5), they move vertically in a parallel straight line as one. The head (5) is thus displaced in the tape width direction.
ヨーク(47)の部分(47a)、(47b)。Portions (47a) and (47b) of the yoke (47).
(47c)によって磁石(45)、(46)を完全に覆
っているため、高透磁率のヨーク材を使用するとか、窓
(4a)の寸法をより小さくするとかにより、ヘッド(
5)および上トランス(7)やその他の外部への漏れ磁
束は小さいままで、コイル作用磁界が大きくできる。(47c) completely covers the magnets (45) and (46), so by using a yoke material with high magnetic permeability or by making the window (4a) smaller, the head (
5) and the magnetic field acting on the coil can be increased while the leakage magnetic flux to the upper transformer (7) and other external parts remains small.
なお上記実施例では板バネ(41)、(42)をセンタ
ーポール(46a)を挟むように配置したが第8図の(
41)、(42)のようにヨ−り(47)の片側◆こま
とめて配置してもよい。In the above embodiment, the leaf springs (41) and (42) were arranged so as to sandwich the center pole (46a), but in the example shown in FIG.
41), (42), one side ◆ of the yaw (47) may be arranged together.
磁石(45)、(46)は対称形状のものを示したが主
磁石(46)を大寸法に、副磁石(45)を漏れ磁束の
防止および環状ギャップを横切る磁束密度が適当になる
よう小寸法にしてもよい。The magnets (45) and (46) are shown as having symmetrical shapes, but the main magnet (46) is made large, and the sub magnet (45) is made small to prevent magnetic flux leakage and to maintain an appropriate magnetic flux density across the annular gap. It can also be a dimension.
ヨーク(47)の部分(47a)、(47b)。Portions (47a) and (47b) of the yoke (47).
(47c)は水平分割形を示したが分割数は2分割でも
それ以上でもよく、別の分割形状にしてもよく、全体を
囲む形になっていればよい。(47c) shows a horizontally divided type, but the number of divisions may be two or more, and another divided shape may be used as long as it surrounds the whole.
板バネは実質的に円形のものを示したが、その他の形状
でも良い。Although the leaf spring is shown as having a substantially circular shape, other shapes may be used.
ヨーク外形は円形のものを示したが、角形など他の形状
でもよい。Although the outer shape of the yoke is shown to be circular, it may be of other shapes such as a rectangular shape.
以上のようにこの発明によれば上ドラムに装着されたヘ
ッドはテープ幅方向に制御し移動できる。駆動部は一組
一体に構成し、それ単体で磁気シールドされ、上ドラム
に収納することができるので、組立、調整が容易となり
、装置が安価瘉こでき、精度の高いものが得られるとい
う効果がある。As described above, according to the present invention, the head mounted on the upper drum can be controlled and moved in the tape width direction. The drive section is constructed as a single unit, magnetically shielded, and can be stored in the upper drum, making assembly and adjustment easy, making the device inexpensive, and providing high precision. There is.
第1図はこの発明による一実施例の回転ドラム装置を示
す断面図、第2図はその平面図、第3図はこの主要部を
更に詳細に示す平面図、第4図はその内部を示すための
断面図、第5図は第4図の正面図、第6図はヘッドが取
り付けられる板パイ・の平面図、第7図は他方の板バ掻
の平面図、第8図は他の実施例の駆動部を示す断面図、
第9図は従来の回転ドラム装置を示す断面図、第10図
(a)乃至第10図(c)はVTRにおけるテープとヘ
ッドの相対的軌跡を説明するための図である。
図において、(21,(3)は上下ドラム、(4a)は
駆動部、(5)はヘッド、(力、(8)は上下トランス
、(13)はテープ、(14)は接触子、(15)は電
極、(41)、(42)は板バネ、(44)は円筒形コ
イル、(45)、(46)は円柱形永久磁石、(47)
はヨーク、(49)は窓である。
なお、各図中同一符号は同一または相当部分を示す。
代理人 弁理士 大 岩 増 雄@1図
第 3 図
第4図
第6図
第9図
4:へ−,1″台
第1θ図Fig. 1 is a sectional view showing a rotating drum device according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a plan view showing the main part in more detail, and Fig. 4 shows the inside thereof. Figure 5 is a front view of Figure 4, Figure 6 is a plan view of the plate to which the head is attached, Figure 7 is a plan view of the other plate, and Figure 8 is a front view of Figure 4. A cross-sectional view showing the drive unit of the embodiment,
FIG. 9 is a sectional view showing a conventional rotating drum device, and FIGS. 10(a) to 10(c) are diagrams for explaining the relative trajectory of the tape and head in a VTR. In the figure, (21, (3) are the upper and lower drums, (4a) is the drive unit, (5) is the head, (force), (8) is the upper and lower transformer, (13) is the tape, (14) is the contact, ( 15) is an electrode, (41) and (42) are leaf springs, (44) is a cylindrical coil, (45) and (46) are cylindrical permanent magnets, (47)
is a yoke, and (49) is a window. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Masuo Oiwa @Figure 1 Figure 3 Figure 4 Figure 6 Figure 9 Figure 4: He-, 1" level 1θ diagram
Claims (5)
ッド軌跡と再生時のヘッド軌跡を任意のテープ送り速度
の下でも一致させるようにした回転ドラム装置であつて
、一対の円柱形永久磁石と、これらの間に配置された強
磁性体のセンターポールと、これらの回りに環状ギャッ
プを形成してこれらを収納保持した強磁性体のヨークと
、前記環状ギャップ内に配置された円筒形コイルと、前
記ヨーク内に保持されて前記円筒形コイルを平行移動可
能に担持する2枚の非磁性体の板バネとを有し、前記板
バネの一方からの延長部を前記ヨークの外へ突き出すた
めに、かつ前記延長部の平行移動を許容するための窓を
前記ヨークに形成し、前記延長部に取り付けられたヘッ
ドを有した駆動部を具備し、前記の2枚の板バネとセン
ターポール面が平行になるよう配置すると共に、センタ
ーポールをはさんで前記の一対の円柱形永久磁石が同一
磁極を対向するよう配置して各円柱形永久磁石とヨーク
で逆向きの二つの閉磁路を構成し環状ギャップを同一の
方向に横切る磁束となし、更に接触子、電極、上トラン
ス、下トランスを備え、これら上下トランスと共に前記
駆動部を回転ドラム装置内に収納配置したことを特徴と
する回転ドラム装置。(1) A rotating drum device in which the head is moved in the width direction of the tape so that the head trajectory during recording and the head trajectory during playback match even under any tape feed speed, and includes a pair of cylindrical permanent A magnet, a ferromagnetic center pole disposed between them, a ferromagnetic yoke forming an annular gap around these to house and hold them, and a cylindrical shape disposed within the annular gap. a coil, and two non-magnetic leaf springs held within the yoke to support the cylindrical coil so as to be movable in parallel, and extending an extension from one of the leaf springs to the outside of the yoke. a window is formed in the yoke for protrusion and to allow parallel movement of the extension, and a drive part having a head attached to the extension, which connects the two leaf springs and the center. The pole surfaces are arranged in parallel, and the pair of cylindrical permanent magnets are arranged so that the same magnetic poles face each other with the center pole in between, creating two closed magnetic paths in opposite directions between each cylindrical permanent magnet and the yoke. and a magnetic flux that crosses the annular gap in the same direction, further comprising a contactor, an electrode, an upper transformer, and a lower transformer, and the drive unit is housed in a rotating drum device together with these upper and lower transformers. Rotating drum device.
れた複数のヘッド位置調整用孔とを上ドラムに設け、上
ドラムの回転軸とヘッドとの中心線上に前記孔を一個配
置してヘッド突出し調整用とし、前記中心線の両側に前
記孔の一対を配置しかつこれらの孔間の中心線は前記中
心線に直交するようにしてヘッド円周位置割出し調整用
とし、直交する前記の交点と環状ギャップの中心点とを
一致させかつ前記交点に対して前記の駆動部取り付け用
の孔を半径方向にずらせて配置した特許請求の範囲第1
項記載の回転ドラム装置。(2) A hole for attaching the drive unit and a plurality of holes for adjusting the head position arranged around the hole are provided in the upper drum, and one hole is arranged on the center line between the rotation axis of the upper drum and the head. A pair of holes are arranged on both sides of the center line, and the center line between these holes is orthogonal to the center line to adjust the circumferential position of the head. The intersection point of the annular gap is aligned with the center point of the annular gap, and the drive unit mounting hole is arranged to be shifted in the radial direction with respect to the intersection point.
Rotating drum device as described in section.
との間に嵌合部を設けた特許請求の範囲第1項記載の回
転ドラム装置。(3) The rotating drum device according to claim 1, wherein a fitting portion is provided between the leaf spring and the inner wall of the yoke for positioning the leaf spring.
分割した特許請求の範囲第1項記載の回転ドラム装置。(4) The yoke is divided into 3 parts near the mounting surface of each leaf spring.
A rotary drum device according to claim 1, which is divided.
た特許請求の範囲第1項記載の回転ドラム装置。(5) The rotating drum device according to claim 1, wherein a pair of leaf springs are arranged to sandwich the center pole.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP371387A JPH0682449B2 (en) | 1987-01-10 | 1987-01-10 | Rotating drum device |
DE19873722927 DE3722927A1 (en) | 1986-07-16 | 1987-07-10 | HEAD DRUM ARRANGEMENT |
US07/073,163 US4882635A (en) | 1986-07-16 | 1987-07-14 | Rotating drum device for a VCR in which the position of the magnetic head is controlled by a magnetic positioning device |
GB8716753A GB2193369B (en) | 1986-07-16 | 1987-07-16 | Rotating drum device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP371387A JPH0682449B2 (en) | 1987-01-10 | 1987-01-10 | Rotating drum device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63173217A true JPS63173217A (en) | 1988-07-16 |
JPH0682449B2 JPH0682449B2 (en) | 1994-10-19 |
Family
ID=11564963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP371387A Expired - Fee Related JPH0682449B2 (en) | 1986-07-16 | 1987-01-10 | Rotating drum device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0682449B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03209602A (en) * | 1990-01-12 | 1991-09-12 | Mitsubishi Electric Corp | Rotary magnetic head device for magnetic recording and reproducing device |
JPH0478016A (en) * | 1990-07-12 | 1992-03-12 | Sharp Corp | Head moving mechanism |
US5343348A (en) * | 1991-04-03 | 1994-08-30 | Victor Company Of Japan, Ltd. | Actuator for displacing a magnetic head |
US5590007A (en) * | 1992-06-29 | 1996-12-31 | Matsushita Electric Industrial Co., Ltd. | Magnetic head driving apparatus having a magnetic head which is immune to the influence of a magnetic circuit |
-
1987
- 1987-01-10 JP JP371387A patent/JPH0682449B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03209602A (en) * | 1990-01-12 | 1991-09-12 | Mitsubishi Electric Corp | Rotary magnetic head device for magnetic recording and reproducing device |
JPH0478016A (en) * | 1990-07-12 | 1992-03-12 | Sharp Corp | Head moving mechanism |
US5343348A (en) * | 1991-04-03 | 1994-08-30 | Victor Company Of Japan, Ltd. | Actuator for displacing a magnetic head |
US5590007A (en) * | 1992-06-29 | 1996-12-31 | Matsushita Electric Industrial Co., Ltd. | Magnetic head driving apparatus having a magnetic head which is immune to the influence of a magnetic circuit |
Also Published As
Publication number | Publication date |
---|---|
JPH0682449B2 (en) | 1994-10-19 |
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