JPH0127484B2 - - Google Patents
Info
- Publication number
- JPH0127484B2 JPH0127484B2 JP19820583A JP19820583A JPH0127484B2 JP H0127484 B2 JPH0127484 B2 JP H0127484B2 JP 19820583 A JP19820583 A JP 19820583A JP 19820583 A JP19820583 A JP 19820583A JP H0127484 B2 JPH0127484 B2 JP H0127484B2
- Authority
- JP
- Japan
- Prior art keywords
- plate
- drive element
- magnetic head
- trapezoidal
- thin
- 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
- 239000002184 metal Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 11
- 230000005684 electric field Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001360 synchronised effect Effects 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
- G11B5/48—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
- G11B5/58—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 provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—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 provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
- G11B5/588—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 provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes by controlling the position of the rotating heads
- G11B5/592—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 provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes by controlling the position of the rotating heads using bimorph elements supporting the heads
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はヘリカル・スキヤン方式のビデオテー
プレコーダ（以下VTRと略す）における回転ヘ
ツド装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary head device for a helical scan type video tape recorder (hereinafter abbreviated as VTR).
（従来例の構成とその問題点）
ヘリカル・スキヤン方式のVTRでは、１フレ
ームをアジマスの異なる磁気ヘツドで２本のトラ
ツクで記録している。そこで、映像信号の記録は
垂直同時信号で同期をとり、磁気テープ上に１フ
レームに１つのコントロール信号と映像信号を記
録し、再生時にはコントロール信号で同期をと
り、記録時のヘツドと同アジマスのヘツドで記録
トラツクを正確にトレースすることによりノイズ
の無い再生画像を得ている。(Conventional configuration and its problems) In a helical scan type VTR, one frame is recorded using two tracks using magnetic heads with different azimuths. Therefore, video signal recording is synchronized using a vertical simultaneous signal, and one control signal and video signal are recorded per frame on the magnetic tape. During playback, synchronization is performed using the control signal, and the head is at the same azimuth as the recording head. A noise-free reproduced image is obtained by accurately tracing the recording track with the head.
しかし、静止・正逆の低速・高速等の特殊再生
時には、再生ヘツドの走行軌跡が記録トラツクと
異なるために、トラツクから別のトラツクを横切
る時、画面にノイズバーが出る。 However, during special playback such as stationary, forward/reverse, low speed, high speed, etc., the traveling locus of the playback head is different from the recording track, so noise bars appear on the screen when crossing from one track to another.
最近、ヘツドの数を増やして、特殊再生時にも
ノイズのない鮮明な画面の得られるVTRが出て
いるが、これは静止・低速再生時のある条件では
ノイズのない画面が得られるが、高速再生時には
ノイズが画面に出る。またテープの送りを間欠送
りとしているために、テープ速度の制御が複雑に
なるという欠点をもつ。 Recently, VTRs have been released that have increased the number of heads and can provide a clear screen with no noise even during special playback. Noise appears on the screen during playback. Furthermore, since the tape is fed intermittently, tape speed control is complicated.
これに対して、圧電磁器板を貼合せた構造の圧
電駆動素子に再生ヘツドを搭載して、特殊再生時
にはヘツドが記録トラツク上をトレースできるよ
うに、駆動素子に、特殊再生モードによつて決ま
る再生ヘツドのトラツプからのずれに対応する電
界を印加して、ヘツドの高さを変えてトラツクの
上に常にあるようにしてノイズのない再生画面を
得ているVTRが市販されている。このVTRの特
徴は再生速度が連続可変であることである。 On the other hand, the playback head is mounted on a piezoelectric drive element having a structure in which piezoelectric ceramic plates are bonded together, and the drive element has a function determined by the special playback mode so that the head can trace the recording track during special playback. There are commercially available VTRs that apply an electric field corresponding to the deviation of the playback head from the trap and change the height of the head so that it is always above the track to obtain a noise-free playback screen. A feature of this VTR is that the playback speed is continuously variable.
しかし、これまでのこのタイプのVTRでは駆
動素子の回転シリンダへの取付けが難しく、また
圧電磁器そのものを挾むような形で固定している
ため、取付けの不安定より駆動素子の先端位置、
つまり、ヘツドの位置安定性が悪くなり、ヘツド
の位置制御が困難であつた。 However, in conventional VTRs of this type, it is difficult to attach the drive element to the rotating cylinder, and because the piezoelectric ceramic itself is fixed in a way that sandwiches it, the tip position of the drive element may be unstable due to unstable installation.
In other words, the positional stability of the head deteriorated, making it difficult to control the position of the head.
（発明の目的）
本発明は、上記の難点を解決するためのもので
あり、先端位置安定性の良い駆動素子取付構造を
有し、ヘツドの位置制御が簡単な回転ヘツド装置
を提供することを目的とする。(Object of the Invention) The present invention is intended to solve the above-mentioned difficulties, and it is an object of the present invention to provide a rotary head device that has a drive element mounting structure with good tip position stability and allows easy head position control. purpose.
（発明の構成）
本発明は、主面に電極付けされ中央部に円形開
口を有し、両側に先端に行くにつれて幅の小さく
なる台形部を有する圧電磁器薄板を１枚または２
枚、上記圧電磁器薄板の開口径より小さい径の中
央開口を有する金属薄板の片側または両側に同心
円状に貼り付けて貼合せ型圧電駆動素子を構成
し、上記駆動素子の内周部の金属板部の一部を用
いて、内周縁に沿つて回転シリンダに固定し、台
形部の先端に磁気ヘツドを取付けたものである。(Structure of the Invention) The present invention comprises one or two piezoelectric ceramic thin plates having an electrode attached to the main surface, a circular opening in the center, and trapezoidal parts on both sides that become narrower toward the tip.
A bonded piezoelectric drive element is constructed by pasting concentrically on one or both sides of a metal thin plate having a central opening with a diameter smaller than the opening diameter of the piezoelectric ceramic thin plate, and the metal plate is attached to the inner circumference of the drive element. A part of the trapezoidal part is fixed to a rotating cylinder along the inner peripheral edge, and a magnetic head is attached to the tip of the trapezoidal part.
このような構成においては、金属薄板の回転シ
リンダへの固着部分が円状に存在するので、結合
が強固であり、また、圧電駆動素子の、磁気ヘツ
ドを装着する両先端部分が台形であるので駆動が
容易であり、駆動素子の先端位置が安定する。 In such a configuration, the portion of the thin metal plate fixed to the rotating cylinder is circular, so the connection is strong, and the piezoelectric drive element has trapezoidal end portions on which the magnetic head is attached. It is easy to drive and the position of the tip of the drive element is stable.
（実施例の説明）
以下、本発明の一実施例について詳細に説明す
る。(Description of an Example) Hereinafter, an example of the present invention will be described in detail.
第１図は本発明に使用する貼合せ型圧電駆動素
子の一実施例の外観を示す斜視図であり、１ａ，
１ｂは圧電磁器薄板で、主面に電極付けされ、中
央部に円形開口を有し、両側に先端に行くにつれ
て幅の小さくなる台形部を有し、それぞれ厚み方
向に分極されていて分極方向が同じになるように
してあり、２は上記圧電磁器薄板１ａ，１ｂの開
口径より小なる径の円形開口を有する金属薄板
で、この金属薄板２の両面に前記圧電磁器薄板１
ａ，１ｂを両円形開口の中心が同じになるように
貼り付けて貼合せ型圧電駆動素子３を構成してい
る。４ａ，４ｂ，４ｃは電極リード線で、電極リ
ード線４ａ，４ｂまたは４ａ，４ｃから電圧が印
加されると駆動素子３は台形部の先端が変位す
る。また駆動素子の先端が台形状になつているの
で、台形の一端固定、一端自由の撓みの動作に近
い変位が得られ、従つて、円環の内周固定・外周
自由の撓みを生ずる従来の円板状のものに比べて
撓みが容易となり、小駆動電力で従来と同等の変
位を得ることができる。 FIG. 1 is a perspective view showing the appearance of an embodiment of a laminated piezoelectric drive element used in the present invention, 1a,
1b is a thin piezoelectric ceramic plate with an electrode attached to its main surface, a circular opening in the center, and trapezoidal parts on both sides that become narrower toward the tip, each polarized in the thickness direction so that the polarization direction is 2 is a metal thin plate having a circular opening with a smaller diameter than the opening diameter of the piezoelectric ceramic thin plates 1a and 1b, and the piezoelectric ceramic thin plates 1 are formed on both sides of the metal thin plate 2.
A and 1b are pasted together so that the centers of both circular openings are the same to form a bonded piezoelectric drive element 3. 4a, 4b, and 4c are electrode lead wires, and when a voltage is applied from the electrode lead wires 4a, 4b or 4a, 4c, the tip of the trapezoidal portion of the driving element 3 is displaced. In addition, since the tip of the drive element is trapezoidal, it is possible to obtain a displacement similar to that of a trapezoid with one end fixed and one end free to deflect. It is easier to bend than a disk-shaped one, and the same displacement as the conventional one can be obtained with less driving power.
第２図は、第１図の駆動素子を備えた回転ヘツ
ド装置の一実施例の分解斜視図であり、５ａ，５
ｂは駆動素子３に取付けられた磁気ヘツド、６は
駆動素子３を回転シリンダ７に取付けるための固
定具で、駆動素子の金属薄板２の円形開口内周部
のみを使つて固定され、８は回転シリンダ７側の
固定部であり、固定具６と共に駆動素子３の取付
けを行う。図中の矢印は電圧印加時の金属薄板２
の台形部の変位方向であり、２つの磁気ヘツド５
ａ，５ｂは独立に動かせる。２つの磁気ヘツドを
別々に駆動する場合に、一方の磁気ヘツドの変位
の影響を他方に及ぼさないようにするには、第１
図の白抜きの部分で示してあるように、圧電磁器
薄板の金属薄板と貼り合せる面の反対面の電極
を、搭載された磁気ヘツドを結ぶ線と直角で円形
開口の中心を通る線で分割するとよい。 FIG. 2 is an exploded perspective view of an embodiment of the rotary head device equipped with the drive element of FIG.
b is a magnetic head attached to the drive element 3, 6 is a fixture for attaching the drive element 3 to the rotating cylinder 7, and is fixed using only the inner circumference of the circular opening of the thin metal plate 2 of the drive element; This is a fixing part on the rotating cylinder 7 side, and the drive element 3 is attached together with the fixture 6. The arrow in the figure indicates the thin metal plate 2 when voltage is applied.
This is the direction of displacement of the trapezoidal part of the two magnetic heads 5.
a and 5b can be moved independently. When driving two magnetic heads separately, in order to prevent the displacement of one magnetic head from affecting the other, the first
As shown in the white area in the figure, the electrode on the opposite side of the piezoelectric ceramic thin plate to the side to be bonded to the metal thin plate is divided by a line passing through the center of the circular opening at right angles to the line connecting the mounted magnetic head. It's good to do that.
特殊再生時には、記録トラツクとヘツドの走行
軌跡のずれに相当する電圧を電極リード線４ａ，
４ｂまたは４ａ，４ｃを通じて駆動素子３に印加
することにより、ヘツド５ａ，５ｂの高さを変
え、記録トラツク上を完全にトレースしてノイズ
の無い画面が得られるようにしている。 During special playback, a voltage corresponding to the deviation between the recording track and the head travel trajectory is applied to the electrode lead wires 4a and 4a.
By applying the voltage to the driving element 3 through 4b or 4a, 4c, the heights of the heads 5a, 5b are changed so that the recording track can be completely traced and a noise-free screen can be obtained.
（発明の効果）
以上述べたように、本発明はヘツドの駆動素子
として、中央部に円形開口部をもつた貼合せ型圧
電駆動素子を採用し、駆動素子の内周部の金属板
部のみを円周状に固定しているため、台形の先端
部の位置安定性が良く、また回転シリンダへの取
付けが簡単であるばかりでなく、磁気ヘツドの装
着されている先端に向けて細くなるような台形に
駆動素子が形成されているので、磁気ヘツドの変
化が容易になるという利点を有する。(Effects of the Invention) As described above, the present invention employs a laminated piezoelectric drive element having a circular opening in the center as the drive element of the head, and only the metal plate portion on the inner circumference of the drive element is used. Because the trapezoidal tip is fixed circumferentially, the positional stability of the trapezoidal tip is good, and it is not only easy to attach to the rotating cylinder, but also tapers toward the tip where the magnetic head is attached. Since the drive element is formed in a trapezoidal shape, it has the advantage that the magnetic head can be easily changed.
第１図は本発明に使用する貼合せ型圧電駆動素
子の一実施例の外観を示す斜視図、第２図は第１
図の駆動素子を備えた回転ヘツド装置の分解斜視
図である。
１ａ，１ｂ……圧電磁器薄板、２……金属薄
板、３……駆動素子、４ａ，４ｂ，４ｃ……電極
リード線、５ａ，５ｂ……磁気ヘツド、６……固
定具、７……回転シリンダ、８……固定具。
FIG. 1 is a perspective view showing the appearance of one embodiment of the laminated piezoelectric drive element used in the present invention, and FIG.
FIG. 2 is an exploded perspective view of a rotary head device equipped with the drive element shown in the figure. 1a, 1b... Piezoelectric ceramic thin plate, 2... Metal thin plate, 3... Drive element, 4a, 4b, 4c... Electrode lead wire, 5a, 5b... Magnetic head, 6... Fixture, 7... Rotation Cylinder, 8...Fixing tool.
Claims (1)
し、両側に先端に行くにつれて幅の小さくなる台
形部を有する圧電磁器薄板を１枚または２枚、上
記圧電磁器薄板の開口径より小さい径の中央開口
を有する金属薄板の片側または両側に前記開口が
同心円状になるように貼り付けて貼合せ型圧電駆
動素子を構成し、上記駆動素子の内周部の金属板
部の一部を円周状に回転シリンダに固定し、上記
両台形部先端にそれぞれ磁気ヘツドを設置し、上
記駆動素子に電界を印加することにより、前記磁
気ヘツドが記録トラツクの幅方向に変位可能にし
たことを特徴とする回転ヘツド装置。 ２ 圧電磁器薄板の金属薄板と貼り合せる面の反
対面の電極を、搭載された磁気ヘツドを結ぶ線と
直角で円形開口の中心を通る線で分割し、２つの
台形部を別々に動作させることを特徴とする特許
請求の範囲第１項記載の回転ヘツド装置。[Scope of Claims] 1. One or two piezoelectric ceramic thin plates each having an electrode attached to its main surface, having a circular opening in the center, and having trapezoidal portions on both sides that become narrower toward the tips; A bonded piezoelectric driving element is constructed by pasting a thin metal plate having a central opening with a diameter smaller than the opening diameter of the thin plate so that the openings are concentrically formed on one or both sides of the thin metal plate, and the metal on the inner periphery of the driving element A part of the plate part is fixed to a rotating cylinder in a circumferential manner, a magnetic head is installed at the tip of each of the trapezoidal parts, and by applying an electric field to the driving element, the magnetic head is moved in the width direction of the recording track. A rotary head device characterized in that it is movable. 2. The electrode on the opposite side of the piezoelectric ceramic thin plate to the side to be bonded to the metal thin plate is divided by a line that is perpendicular to the line connecting the mounted magnetic head and passes through the center of the circular opening, and the two trapezoidal parts are operated separately. A rotary head device according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58198205A JPS6093615A (en) | 1983-10-25 | 1983-10-25 | Rotary head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58198205A JPS6093615A (en) | 1983-10-25 | 1983-10-25 | Rotary head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6093615A JPS6093615A (en) | 1985-05-25 |
| JPH0127484B2 true JPH0127484B2 (en) | 1989-05-29 |
Family
ID=16387225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58198205A Granted JPS6093615A (en) | 1983-10-25 | 1983-10-25 | Rotary head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6093615A (en) |
-
1983
- 1983-10-25 JP JP58198205A patent/JPS6093615A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6093615A (en) | 1985-05-25 |
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