JPS6045924A - Video tape recorder - Google Patents
Video tape recorderInfo
- Publication number
- JPS6045924A JPS6045924A JP15212883A JP15212883A JPS6045924A JP S6045924 A JPS6045924 A JP S6045924A JP 15212883 A JP15212883 A JP 15212883A JP 15212883 A JP15212883 A JP 15212883A JP S6045924 A JPS6045924 A JP S6045924A
- Authority
- JP
- Japan
- Prior art keywords
- driving element
- drive element
- head
- thin plate
- electric field
- 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
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
- G11B5/58—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)
- Control Of Position Or Direction (AREA)
Abstract
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・スキャン方式のビデオ・テープレコ
ーダ(以下VTRと略す)に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to 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・スキャン方式のVTRでは、映像信号の記録
は垂直同期信号で同期をとり、磁気テープ上にコントロ
ール信号と映像信号を記録する。Conventional configuration and problems thereof In a helical scan type VTR, recording of video signals is synchronized with a vertical synchronization signal, and control signals and video signals are recorded on a magnetic tape.
再生時には、コントロール信号で同期をとり、回転シリ
ンダ上の磁気ヘッドで記録トラックをトレースして映像
信号を再生する。During playback, synchronization is achieved using a control signal, and a magnetic head on the rotating cylinder traces the recording track to play back the video signal.
即ち、通常再生時には上記の方法によってノイズのない
鮮明な画像が得られる。しかし、静止・低速・高速等の
特殊再生時には、再生ヘッドが複数のトラックをトレー
スするため画面にノイズバーが現われる。That is, during normal playback, a clear image without noise can be obtained by the above method. However, during special playback such as static, low-speed, and high-speed playback, noise bars appear on the screen because the playback head traces multiple tracks.
最近、ヘッドの数を増加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が出されている力(あ
らゆる再生モードでノイズのない再生画面が得られるも
のはない。Recently, VTRs have been released that have increased the number of heads and can provide a clear, noise-free screen even during special playback (there is no other VTR that can provide a noise-free playback screen in all playback modes).
また圧電磁器板を貼合せた構造の駆動素子に再生専用ヘ
ッドのみを搭載して、記録ヘッドで信号を記録した後特
殊再生時にはヘッドが記録トラ、ツク上をトレースでき
るように、駆動素子に変位に相当する電界を印加して、
ヘッドを動かしてノイズのない再生画面を得ているVT
Rが市販されている。In addition, only a read-only head is mounted on a drive element made of piezoelectric ceramic plates, and after recording a signal with the recording head, the head is displaced on the drive element so that it can trace the recording track and track during special playback. By applying an electric field corresponding to
VT moving the head to obtain a noise-free playback screen
R is commercially available.
しかし、最近音声信号がFM記録・再生されるようにな
り、回転ヘッドの数が従来のものより2個増え、映像記
録ヘッドも映像信号を最適条件で記録するために、記録
トラック幅が58μmと19μmの2つのモートに合わ
せて計4つのヘッドを搭載している。これに上記に示し
た駆動素子上に搭載した再生ヘッドを加えると、回転シ
リンダ十には計8個のヘッドが搭載されることになり、
ヘッドの入出力用の回転トランスが多数となり実現が困
難である。However, recently, audio signals have been recorded and played back using FM, the number of rotating heads has increased by two compared to the conventional one, and the recording track width of the video recording head has increased to 58 μm in order to record video signals under optimal conditions. It is equipped with a total of four heads, including two 19μm motes. Adding to this the reproducing head mounted on the drive element shown above, a total of eight heads are mounted on the rotary cylinder ten.
This requires a large number of rotary transformers for input and output of the head, making it difficult to realize.
へ・アトの数を減らす方法として、記録・再生を行なう
ヘッドを駆動素子に搭載することが考えられるが、圧電
磁器を使用した駆動素子は、第1図に示すように、直流
電圧を印加して後、上記電圧を取り除いても残留歪が残
ることや、取り付は法が不確実であったために駆動素子
上のヘッド位置が不安定であるため、ビデオ信号トラッ
クとコントo−ル信号の位置関係を示すX値が変化して
しまい実現は困難であった。One possible way to reduce the number of heads is to mount a recording/reproducing head on a drive element, but drive elements using piezoelectric ceramics do not require direct current voltage to be applied to them, as shown in Figure 1. After the voltage is removed, residual distortion remains, and the head position on the drive element is unstable due to the unreliable mounting method, so the video signal track and control signal are It was difficult to realize this because the X value indicating the positional relationship changed.
発明の目的
本発明は上記の問題点を解決した先端位置の安定性の良
い駆動素子と駆動法により、記録・再生ヘッドの駆動素
子上への搭載を可能にし、より少ないヘッド数で稈殊再
生ができるVTRを提供することにある。Purpose of the Invention The present invention solves the above-mentioned problems and uses a driving element and driving method with good tip position stability, making it possible to mount a recording/reproducing head on the driving element, thereby achieving culm reproduction with fewer heads. Our goal is to provide a VTR that can.
また、再生専用ヘッドを搭載した場合にも、位置安定性
が良いので制御が簡単なVTRを提供することを目的と
する。Another object of the present invention is to provide a VTR that has good positional stability and is easy to control even when equipped with a read-only head.
発明の構成
本発明は上記目的を達成するために、内周が円形である
圧電磁器薄板と、円周が上記圧電磁器板の径のよりも小
さな円形の金属薄板を同心円状に貼り合わせた貼合せ型
圧電駆動素子上に、磁気ヘッドを搭載し、上記駆動素子
をその内周の金属薄板部において回転シリンダに取り付
け、上記駆動素子を内周の金属薄板部のみで固定するこ
とにより、上記磁気ヘッドの位置安定性を改善し、かつ
、振幅値が時間とともに減衰する交流電界を上記駆動素
子に印加することによりヘッドが初期位置設定値になる
ようにする。これによりヘッドの位置安定性の向上を企
っている。Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a pasting method in which a piezoelectric ceramic thin plate having a circular inner circumference and a circular metal thin plate having a circumference smaller than the diameter of the piezoelectric ceramic plate are laminated concentrically. A magnetic head is mounted on a mating piezoelectric drive element, the drive element is attached to a rotary cylinder at its inner thin metal plate part, and the drive element is fixed only by the inner thin metal plate part, thereby generating the magnetic head. The positional stability of the head is improved and the head is brought to the initial position setting by applying an alternating electric field whose amplitude value attenuates over time to the drive element. This is intended to improve the positional stability of the head.
実施例の説明
以下、本発明の実施例を図に従って行なう。第2図は本
発明の1実施例に用いる貼合せ型圧電駆動素子の外形図
である。同図において1,1′は主面に電極付けをされ
た円環形の圧電磁器板で、厚さの方向に分極されている
。2は金属薄板で、3は圧電駆動素子全体を示し、4.
4’、4“は電極リード線である。圧電磁器板1,1′
は金属板2に同心円状に貼り付けられ、電極リード#i
+4゜4′問および4“間に電界を印加すると、駆動素
子3は屈曲姿態で変位する。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described according to the drawings. FIG. 2 is an outline drawing of a bonded piezoelectric drive element used in one embodiment of the present invention. In the figure, reference numerals 1 and 1' denote annular piezoelectric ceramic plates having electrodes attached to their main surfaces, which are polarized in the thickness direction. 2 is a thin metal plate, 3 is the entire piezoelectric drive element, and 4.
4', 4'' are electrode lead wires. Piezoelectric ceramic plates 1, 1'
are attached concentrically to the metal plate 2, and the electrode lead #i
When an electric field is applied between +4° and 4', the drive element 3 is displaced in a bent position.
第3図は第2図の圧電駆動素子の回転シリンダへの取付
は状態を示し、同図において、6は回転シリンダで、駆
動素子3を固定する環状の固定部6′を有する。駆動素
子3は固定具7と固定部5′で、内周の金属板部を介し
て回転シリンダ5に固定される。6,6′は磁気ヘッド
であり、駆動素子3に電界を印加することにより矢印の
方 に変位する。駆動素子3の固定を金属板部を円周状
に固定することにより行なっているので、ヘッド6゜6
′の位置安定性が良く、また固定も簡単にできる。FIG. 3 shows how the piezoelectric drive element of FIG. 2 is attached to the rotary cylinder. In the figure, 6 is a rotary cylinder which has an annular fixing part 6' for fixing the drive element 3. FIG. The drive element 3 is fixed to the rotating cylinder 5 by a fixing member 7 and a fixing part 5' via a metal plate part on the inner circumference. 6 and 6' are magnetic heads, which are displaced in the direction of the arrow by applying an electric field to the drive element 3. Since the drive element 3 is fixed by fixing the metal plate portion in a circumferential manner, the head 6°6
' has good positional stability and can be easily fixed.
第4図は駆動素子への印加波形とヘッドの変位を示した
もので、直流電圧印加後の駆動素子3の残留歪があって
も、振幅値が時間とともに減衰していく交流電界の印加
により、ヘッドが初期の設定位置に落着くことを示して
いる。Figure 4 shows the waveform applied to the drive element and the displacement of the head. Even if there is residual strain in the drive element 3 after applying a DC voltage, the amplitude value attenuates over time due to the application of an AC electric field. , indicating that the head has settled into the initial set position.
発明の効果
以上述べたように、本発明では位置安定性のよい駆動素
子取付は手段と、ヘッドの初期設定位置が保証できる駆
動手段の採用により、記録・再生ヘッドを駆動素子上に
搭載できるので、FMオーディオ対応時、68μmトラ
ックの通常記録モードと19μmトラックの3倍記録モ
ード対応の専用へ、ド対応時にも6ヘツド構成が可能な
ので、シリンダ構造が簡単になる。また、特殊再生のみ
でなく、1コマ記録や高速記録などを標準フォーマット
で記録できる特徴がある。Effects of the Invention As described above, in the present invention, the recording/reproducing head can be mounted on the drive element by employing a means for mounting the drive element with good positional stability and a drive means that can guarantee the initial setting position of the head. , 6-head configuration is possible even when FM audio is supported, a 68 μm track normal recording mode and a 19 μm track triple recording mode, and a 6-head configuration is possible, simplifying the cylinder structure. In addition to special playback, it also has the feature of being able to record single-frame recording, high-speed recording, etc. in standard formats.
また再生専用ヘッドのみを駆動素子に搭載した場合にも
、ヘッドの位置安定性が良いので、ヘッドの位置制御が
簡単である特殊再生可能VTRを提供できる。Furthermore, even when only a read-only head is mounted on the drive element, the positional stability of the head is good, so that it is possible to provide a VTR capable of special reproduction in which the head position can be easily controlled.
第1図は駆動素子に直流電界を印加した時の特性を示す
図、第2図は本発明の1実施例のVTRに用いる圧電駆
動素子の外形図、第3図は第2図の駆動素子の回転シリ
ンダへの取付は状態を示す分解斜視図、第4図は残留歪
がある駆動素子に振幅値が時間とともに減衰する交流電
界を印加した時の様子を示す図である。
1.1′・・・・・・圧電磁器板、2・・・・・・金属
板、3・・・・・駆動素子、4.4’、4“・・・・・
・電極リード線、6゜5′・・・−・回転シリンダと固
定部、6,6′・・・・・・磁気へ、ド、7・・・山固
定具。
代理人の氏名 弁理士 中 尾 敏 男 ほか1名菓
1 図
時開
第 2 図
第4図
U寸 閤Fig. 1 is a diagram showing the characteristics when a DC electric field is applied to the drive element, Fig. 2 is an outline diagram of a piezoelectric drive element used in a VTR according to an embodiment of the present invention, and Fig. 3 is a diagram showing the drive element of Fig. 2. FIG. 4 is an exploded perspective view showing the state of attachment to a rotating cylinder, and FIG. 4 is a diagram showing the state when an alternating current electric field whose amplitude value attenuates over time is applied to a drive element with residual strain. 1.1'...Piezoelectric ceramic plate, 2...Metal plate, 3...Drive element, 4.4', 4"...
・Electrode lead wire, 6゜5'...-Rotating cylinder and fixed part, 6,6'...Magnetic, C, 7...Mountain fixing tool. Name of agent: Patent attorney Toshio Nakao and one other name
1 Figure Time Opening 2 Figure 4 U Dimension 閤
Claims (1)
記圧電磁器薄板の径よりも小さな円形の金属薄板を同心
円状に貼り合わせた貼合せ型圧電駆動素子上に、磁気ヘ
ッドを相対する位置に取り付け、上記駆動素子を内周の
上記金属薄板の金属板部において回転シリ−ンダに取り
付け、上記磁気ヘッドを上記駆動素子に電界を印加する
ことにより、磁気テープの、記録トラックの幅方向に変
位可能とするとともに、変位動作の停止時に上記磁気ヘ
ッドの位置制御のために、上記ヘッドの振幅の中心が初
期位置設定値になるような振幅値の交流電界を上記駆動
素子に印加し、時間とともに上8己交流電界の振幅値を
減衰させていくことを特徴とするビデオテープレコーダ
。A position where the magnetic head is placed opposite to a bonded piezoelectric drive element in which a thin piezoelectric ceramic plate having a circular inner circumference and a thin circular metal plate having at least an inner circumference smaller than the diameter of the piezoelectric ceramic thin plate are laminated concentrically. The driving element is attached to the rotary cylinder at the metal plate portion of the thin metal plate on the inner periphery, and the magnetic head is moved in the width direction of the recording track of the magnetic tape by applying an electric field to the driving element. In order to enable displacement and to control the position of the magnetic head when the displacement operation is stopped, an alternating current electric field with an amplitude value such that the center of the amplitude of the head becomes the initial position setting value is applied to the drive element, and A video tape recorder characterized in that the amplitude value of an alternating current electric field is attenuated at the same time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15212883A JPS6045924A (en) | 1983-08-20 | 1983-08-20 | Video tape recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15212883A JPS6045924A (en) | 1983-08-20 | 1983-08-20 | Video tape recorder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6045924A true JPS6045924A (en) | 1985-03-12 |
Family
ID=15533668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15212883A Pending JPS6045924A (en) | 1983-08-20 | 1983-08-20 | Video tape recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6045924A (en) |
-
1983
- 1983-08-20 JP JP15212883A patent/JPS6045924A/en active Pending
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