JPS6355134B2 - - Google Patents
Info
- Publication number
- JPS6355134B2 JPS6355134B2 JP12695082A JP12695082A JPS6355134B2 JP S6355134 B2 JPS6355134 B2 JP S6355134B2 JP 12695082 A JP12695082 A JP 12695082A JP 12695082 A JP12695082 A JP 12695082A JP S6355134 B2 JPS6355134 B2 JP S6355134B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- bending vibrator
- vibrator
- bending
- rotating
- 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
- 238000005452 bending Methods 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 2
- 230000010287 polarization Effects 0.000 claims description 2
- 230000005684 electric field Effects 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000008602 contraction Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000000034 method Methods 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】
本発明は、回転ヘツド型磁気記録再生装置の回
転磁気ヘツド装置に関するもので、再生時におい
て、再生磁気ヘツドが自動的に記録トラツクを追
尾するための手段として、先端部を金属板のみに
した屈曲振動子に磁気ヘツドを取付けて、鮮明な
再生画像を得ようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary magnetic head device for a rotary head type magnetic recording/reproducing device. The idea is to attach a magnetic head to a bending vibrator made of only metal plates to obtain clear reproduced images.
回転ヘツド型磁気記録再生装置においては、再
生時に磁気ヘツドを最適トラツキング状態にする
必要があるため、記録時にコントロール信号を磁
気テープに記録しておき、再生時にこのコントロ
ール信号を利用して回転磁気ヘツドで磁気テープ
上の記録トラツクをトレースしている。しかしな
がら、磁気テープの伸縮や記録装置と再生装置の
相違といつた要因でトラツクずれが起こる。ま
た、静止画、低速、高速といつた特殊再生画像を
得るため再生時の磁気テープの走行速度が記録時
の速度と変えられると、コントロール信号では位
置制御ができなくなり、磁気ヘツドは記録トラツ
クから大きくはずれてしまう。 In a rotating head type magnetic recording/reproducing device, it is necessary to put the magnetic head in an optimal tracking state during playback, so a control signal is recorded on the magnetic tape during recording, and this control signal is used to control the rotating magnetic head during playback. The recording track on the magnetic tape is traced. However, track deviations occur due to factors such as expansion and contraction of the magnetic tape and differences between recording and reproducing devices. Additionally, if the running speed of the magnetic tape during playback is changed from the speed during recording to obtain special reproduction images such as still images, low speed, and high speed images, the position cannot be controlled using control signals, and the magnetic head moves away from the recording track. It will deviate greatly.
このため、自動的に磁気ヘツドを記録トラツク
の中心に移動させる自動トラツキングが行なわれ
ている。この自動トラツキングの手段として、従
来、回転磁気ヘツドを２枚の矩形圧電体を貼合わ
せて構成した屈曲振動子に取付け、圧電体に電界
を印加して、回転磁気ヘツドの高さを可変する方
法がとられてきた。しかしながら、これらの回転
磁気ヘツド装置においては、回転シリンダの周囲
からドラムモータの回転軸までの長さが短いた
め、最適トラツキング状態とするために必要とす
る磁気ヘツドの変位量を得るには、前記屈曲振動
子の厚さを非常に薄くしなければならない。した
がつて、、圧電体の加工がやりにくいとともに磁
気ヘツドを接着したり、屈曲振動子の回転シリン
ダへの取付け時に破損しやすいため、作業能率が
低いという欠点がある。また矩形の屈曲振動子の
場合、取付けを一箇所で行なわなければならず、
回転シリンダ上の磁気ヘツドの位置が時間的に不
安定になる。また、取扱いやすさを考えて、屈曲
振動子の厚さを決めれば、最適トラツキング状態
を実現するために必要な変位量を得られる印加電
界は大きくなり、圧電体の特性劣化をもたらす。 For this reason, automatic tracking is performed in which the magnetic head is automatically moved to the center of the recording track. Conventionally, as a means of automatic tracking, a rotating magnetic head is attached to a bending vibrator made up of two rectangular piezoelectric bodies pasted together, and an electric field is applied to the piezoelectric body to vary the height of the rotating magnetic head. has been taken. However, in these rotating magnetic head devices, since the length from the circumference of the rotating cylinder to the rotating shaft of the drum motor is short, it is necessary to The thickness of the flexural transducer must be made very thin. Therefore, it is difficult to process the piezoelectric body, and it is easily damaged when the magnetic head is glued or when the bending vibrator is attached to the rotating cylinder, resulting in low work efficiency. In addition, in the case of a rectangular bending vibrator, it must be installed in one place.
The position of the magnetic head on the rotating cylinder becomes unstable over time. Furthermore, if the thickness of the flexural vibrator is determined with ease of handling in mind, the applied electric field required to obtain the amount of displacement required to achieve the optimum tracking state will be increased, leading to deterioration of the characteristics of the piezoelectric material.
本発明はかかる欠点を解消すべく、磁気ヘツド
を最適トラツキング状態に位置させ、かつ磁気ヘ
ツド位置の経時変化を小さくできる屈曲振動姿態
振動子を具備し、加工、組立て、調整作業の態率
向上に寄与する高信頼性の回転磁気ヘツド装置を
提供するものである。 In order to eliminate such drawbacks, the present invention is equipped with a bending vibration posture vibrator that can position the magnetic head in an optimal tracking state and reduce changes in the magnetic head position over time, thereby improving the efficiency of processing, assembly, and adjustment work. The purpose of the present invention is to provide a highly reliable rotating magnetic head device that contributes to the present invention.
以下、図を用いて本発明の詳細な説明を行な
う。第１図は本発明の回転磁気ヘツド装置に用い
る屈曲振動子の一実施例である。同図において、
１は厚さ方向に分極され、その主面に電極を付け
られた圧電体であり、この圧電体１は金属板２に
貼合せられて、屈曲振動子を形成している。屈曲
振動子の先端部は、同図に示すように、金属板３
のみになつており、この部分の曲げ剛性は他の部
分の曲げ剛性に比べていちじるしく小さくなつて
いる。３は磁気ヘツドであり、屈曲振動子先端の
金属部分に取付けられている。 Hereinafter, the present invention will be explained in detail using figures. FIG. 1 shows an embodiment of a bending vibrator used in the rotating magnetic head device of the present invention. In the same figure,
A piezoelectric body 1 is polarized in the thickness direction and has an electrode attached to its main surface.This piezoelectric body 1 is bonded to a metal plate 2 to form a bending vibrator. As shown in the figure, the tip of the bending vibrator is attached to a metal plate 3.
The bending rigidity of this part is significantly smaller than that of other parts. 3 is a magnetic head, which is attached to the metal part at the tip of the bending vibrator.
第２図は第１図に示した屈曲振動子を回転シリ
ンダ５に取付けたところを示している。同図にお
いて、４は屈曲振動子を回転シリンダ５に取付け
る取付け部で、６は取付けのためのネジである。
また、７，８は屈曲振動子を構成する圧電体に電
界を印加するための電極リード線であり、図では
圧電体の分極の方向を同一にした例を示してい
る。 FIG. 2 shows the bending vibrator shown in FIG. 1 attached to the rotating cylinder 5. As shown in FIG. In the figure, reference numeral 4 indicates an attachment portion for attaching the bending vibrator to the rotary cylinder 5, and 6 indicates a screw for attachment.
Further, 7 and 8 are electrode lead wires for applying an electric field to the piezoelectric body constituting the bending vibrator, and the figure shows an example in which the directions of polarization of the piezoelectric body are the same.
第２図に示す回転磁気ヘツド装置において、屈
曲振動子は取付け部４を固定端にしたはりと同様
の振動を行なう。すなわち、屈曲振動子を構成す
る圧電体に電界を印加すると、その大きさに応じ
て磁気ヘツドを取付けた先端が変位するので、印
加電界の制御により、最適トラツキング状態が得
られる。第１図に示したような円環形または楕円
環形屈曲振動子を用いることにより、屈曲振動子
の長さを矩形屈曲振動子よりも長くできるので、
同一電界で大きな変位がとれる。また、先端の曲
げ剛性を小さくするために、金属板のみにするこ
とにより、同様に同一電界で大きな変位がとれ
る。実験では、円環形屈曲振動子の場合、金属板
のみの部分がない、つまり円環形の圧電体をその
まま金属板２に貼付けたものに対して、約50〜60
％変位が大きくなる。 In the rotating magnetic head device shown in FIG. 2, the bending vibrator vibrates in the same manner as a beam with the mounting portion 4 as a fixed end. That is, when an electric field is applied to the piezoelectric body constituting the bending vibrator, the tip to which the magnetic head is attached is displaced in accordance with the magnitude of the electric field, so that an optimum tracking state can be obtained by controlling the applied electric field. By using an annular or elliptical bending vibrator as shown in Fig. 1, the length of the bending vibrator can be made longer than that of a rectangular bending vibrator.
A large displacement can be achieved with the same electric field. Moreover, by using only a metal plate to reduce the bending rigidity of the tip, a large displacement can be similarly achieved with the same electric field. In experiments, in the case of an annular bending vibrator, it was found that the vibration was approximately 50 to 60
% displacement increases.
本発明の回転磁気ヘツド装置では、従来からの
問題である、必要変位をとるために圧電振動子を
薄くすることに起因する諸問題点や、取付け精度
が悪いという問題点を解決できる。また、先端部
を金属板のみにしていない構造の円環形または楕
円環形屈曲振動子に対しても、同一電界で大きな
変位をとれるため、必要変位に対する印加電界が
小さくなり、振動子の寿命を伸ばし、また信頼性
をあげることができる。 The rotating magnetic head device of the present invention can solve the conventional problems caused by making the piezoelectric vibrator thinner in order to obtain the necessary displacement and the problem of poor mounting accuracy. In addition, since a large displacement can be achieved with the same electric field even for annular or elliptic annular bending vibrators whose tips do not have a metal plate only, the applied electric field for the required displacement is reduced, extending the life of the vibrator. , it is also possible to improve reliability.
第１図は本発明の回転磁気ヘツド装置の一実施
例に用いる円環形屈曲振動子の斜視図であり、第
２図Ａは第１図の屈曲振動子を用いた回転磁気ヘ
ツド装置の一実施例の平面図、同図Ｂは側面図で
ある。
１……圧電体、２……金属板、３……磁気ヘツ
ド、４……取付け部、５……回転シリンダ、６…
…ネジ。
FIG. 1 is a perspective view of an annular bending vibrator used in an embodiment of the rotating magnetic head device of the present invention, and FIG. 2A is an embodiment of the rotating magnetic head device using the bending vibrator of FIG. A plan view of the example, and Figure B is a side view. DESCRIPTION OF SYMBOLS 1...Piezoelectric body, 2...Metal plate, 3...Magnetic head, 4...Mounting part, 5...Rotating cylinder, 6...
…screw.
Claims (1)
両側にその先端部分を除いて、厚さ方向に分極軸
をもつ圧電体を貼合せた円環形または楕円環形の
屈曲振動子と、金属板の前記先端部分に取付けた
磁気ヘツドと、前記屈曲振動子を支持した回転シ
リンダとを有する回転磁気ヘツド装置。1. A toroidal or elliptic ring-shaped bending vibrator in which a piezoelectric material having a polarization axis in the thickness direction is laminated on one or both sides of a circular or elliptical metal plate, except for the tip portion thereof, and A rotating magnetic head device comprising a magnetic head attached to a tip portion and a rotating cylinder supporting the bending vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57126950A JPS5919227A (en) | 1982-07-20 | 1982-07-20 | Rotary magnetic head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57126950A JPS5919227A (en) | 1982-07-20 | 1982-07-20 | Rotary magnetic head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5919227A JPS5919227A (en) | 1984-01-31 |
| JPS6355134B2 true JPS6355134B2 (en) | 1988-11-01 |
Family
ID=14947902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57126950A Granted JPS5919227A (en) | 1982-07-20 | 1982-07-20 | Rotary magnetic head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5919227A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5463506A (en) * | 1992-11-25 | 1995-10-31 | Nippon Hoso Kyokai | Head drum apparatus |
-
1982
- 1982-07-20 JP JP57126950A patent/JPS5919227A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5919227A (en) | 1984-01-31 |
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