JPS601620A - Rotary head device - Google Patents
Rotary head deviceInfo
- Publication number
- JPS601620A JPS601620A JP58109849A JP10984983A JPS601620A JP S601620 A JPS601620 A JP S601620A JP 58109849 A JP58109849 A JP 58109849A JP 10984983 A JP10984983 A JP 10984983A JP S601620 A JPS601620 A JP S601620A
- Authority
- JP
- Japan
- Prior art keywords
- bimorph
- bimorph element
- vibration
- head device
- view
- 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
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000010355 oscillation Effects 0.000 abstract 5
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/04—Automatic feed mechanism producing a progressive transducing traverse of the head in a direction which cuts across the direction of travel of the recording medium, e.g. helical scan, e.g. by lead-screw
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明はビデオテープレコーダ等に組み込捷れる回転ヘ
ッド装置に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a rotary head device that can be incorporated into a video tape recorder or the like.
〈従来技術〉
従来、ビデオテープレコーダに於いて回転ヘッド装置が
組み込まれ、磁気デーゾの走行と同時に磁気信号を読み
取る磁気ヘッドを斜め方向に回転させていた。さて、こ
の回転ヘッド装置による読み取りを行々う方式を行なう
場合磁気テープに重畳されたパイロット信号を検出して
ヘッド自身の位置偏差を読み取り、その読み取り信号に
基づいてヘッド自身のトラッキングを調整していた。<Prior Art> Conventionally, a rotary head device was incorporated in a video tape recorder, and the magnetic head for reading magnetic signals was rotated in an oblique direction at the same time as the magnetic diso was running. Now, when using this reading method using a rotating head device, the pilot signal superimposed on the magnetic tape is detected, the positional deviation of the head itself is read, and the tracking of the head itself is adjusted based on the read signal. Ta.
第１図（ａ）は従来の回転ヘッド装置の側面断面図、第
１図（ｂ）はその平面図である。Ｉは上側７リンダ、２
は下側シリンダ、３は回転軸、４は回転軸３に対して固
定されたバイモルフ素子、５はバイモルフ素子４の先端
の自由端に設置されたビデオヘッド素子である。上記バ
イモルフ素子４は上述した位置偏差読み取り信号に基づ
いて上下動し、ビデオヘッド素子５のトランキングを制
御する。第２図（ａ）はビデオヘッド素子５の取り付は
部周辺の側面図、第２図（ｂ）はその平面図である。上
記バイモルフ素子４は可撓性があり一端が自由に湾曲で
きるのでバイモルフ素子４自身には一定の固有振動が発
生する。又その振動の大きさ及び位相はビデオヘッド素
子５と磁気テープとの摺動状態の具合で複雑に変動する
。この為上記したビデオヘッド素子５のトラノキングを
行なっても上記バイモルフ素子４の固有振動の為にミス
トランキングを起こすことになる。この傾向は磁気テー
プのトラック巾（トラックピノチンが狭い程顕著に現わ
れる０以上の様なミストランキングに対する対応策とし
て、従来、バイモルフ素子４の固有振動を検出してこの
固有振動に対応した電気信号を発生せしめ」−配置有振
動を減衰せしめる減衰信号を上記バイモルフ素子４に印
加する装置ｉ提案されている（特公昭５８−１８６８６
号公報参照）。第３図は上記ミストラッキングに対する
対応策を施こした装置を示し、同図（ａ）はビデオヘッ
ド素子の取り付は部周辺の側面図、同図（ｂ）はその平
面図、同図（Ｃ）はその正面図及び回路との接続構成を
示す図である。FIG. 1(a) is a side sectional view of a conventional rotary head device, and FIG. 1(b) is a plan view thereof. I is upper 7 cylinder, 2
3 is a lower cylinder, 3 is a rotating shaft, 4 is a bimorph element fixed to the rotating shaft 3, and 5 is a video head element installed at the free end of the bimorph element 4. The bimorph element 4 moves up and down based on the above-mentioned positional deviation reading signal to control trunking of the video head element 5. FIG. 2(a) is a side view of the mounting area of the video head element 5, and FIG. 2(b) is a plan view thereof. Since the bimorph element 4 is flexible and can be freely bent at one end, a certain natural vibration is generated in the bimorph element 4 itself. Further, the magnitude and phase of the vibration vary in a complicated manner depending on the sliding condition between the video head element 5 and the magnetic tape. For this reason, even if the above-mentioned video head element 5 is tracked, mistrunking will occur due to the natural vibration of the bimorph element 4. This tendency has conventionally been developed by detecting the natural vibration of the bimorph element 4 and sending an electric signal corresponding to this natural vibration as a countermeasure against mistrunking such as 0 or more, which appears more prominently as the track width (track pinotine) of the magnetic tape becomes narrower. A device for applying a damping signal to the bimorph element 4 to attenuate vibrations has been proposed (Japanese Patent Publication No. 58-18686).
(see publication). FIG. 3 shows a device that takes measures against the above-mentioned mistracking. FIG. C) is a front view thereof and a diagram showing a connection configuration with a circuit.
同図の装置ではバイモルフ素子４の片面の電極６を２分
割して電極６ａ、６ｂとしている。電極６ｂに該当する
部分がバイモルフ素子４の振動をあらＡ２す電気信号を
発生するバイモルフ振動センサとなる。このバイモルフ
振動センサの出力は帰環されバイモルフの駆動回路部に
供給される。しかしこの第３図に示す装置ではバイモル
フ振動センサがバイモルフ素子４の側部の一部からなる
為バイモルフ素子４の駆動の為の電極６ａの占有面積が
減少し、駆動時においてバイモルフ素子４の先端がひね
られたりすることによるアジマス損が発生した。In the device shown in the figure, the electrode 6 on one side of the bimorph element 4 is divided into two to form electrodes 6a and 6b. A portion corresponding to the electrode 6b serves as a bimorph vibration sensor that generates an electric signal A2 that suppresses the vibration of the bimorph element 4. The output of this bimorph vibration sensor is fed back to the bimorph drive circuit. However, in the device shown in FIG. 3, since the bimorph vibration sensor is formed from a part of the side of the bimorph element 4, the area occupied by the electrode 6a for driving the bimorph element 4 is reduced, and when the bimorph element 4 is driven, the tip of the bimorph element 4 is Azimuth loss occurred due to twisting.
く目 的〉
本発明は以上の従来問題点を解消する為になされたもの
で、バイモルフ素子の固有振動を検出してこの固有振動
に対応した電気信号を発生せしめ上記固有振動を減衰せ
しめる構成を備えると共にしかもバイモルフ素子の変位
をバランス良く実行でき得る装置を提供することを目的
とする。Purpose of the present invention The present invention has been made to solve the above-mentioned conventional problems, and provides a structure for detecting the natural vibration of a bimorph element, generating an electric signal corresponding to this natural vibration, and attenuating the natural vibration. It is an object of the present invention to provide an apparatus that can carry out the displacement of a bimorph element in a well-balanced manner.
〈実施例〉
以下本発明に係る回転ヘッド装置の一実施例について図
面を用いて詳細に説明する。<Embodiment> An embodiment of the rotary head device according to the present invention will be described in detail below with reference to the drawings.
第４図（ａ）は本発明に係る回転ヘッド装置の一実施例
のビデオヘッド素子の取り付は部周辺の平面図、同図（
ｂ）はその側面図及び回路との接続構成を示す図である
。ビデオヘッド素子５が自由端に取り伺けられた平板状
のバイモルフ素子４の中央面上に平面状の振動検知用圧
電素子７が層設される。FIG. 4(a) is a plan view of the mounting area of the video head element of one embodiment of the rotary head device according to the present invention;
b) is a side view thereof and a diagram showing a connection configuration with a circuit. A flat piezoelectric element 7 for vibration detection is layered on the center surface of a flat bimorph element 4 having a video head element 5 at its free end.
上記振動検知用圧電素子７はバイモルフ素子４の湾曲動
作を妨げないように出来るだけ薄く且つ柔かい材料が良
い。例えばポリフッカビニリデン（ＰＶＤＦ ）が適し
ている。上記振動検知用圧電素子７の検知出力の取出し
は回転状態で行なう為ブラシーリング方式かロータリー
トランスにて行なう。The piezoelectric element 7 for vibration detection is preferably made of as thin and soft a material as possible so as not to interfere with the bending motion of the bimorph element 4. For example, polyfluorocvinylidene (PVDF) is suitable. The detection output of the piezoelectric element 7 for vibration detection is taken out in a rotating state, so a brush ring method or a rotary transformer is used.
第５図は本発明に係る回転ヘッド装置の一実施例の各部
波形図である。（ａ）はバイモルフ素子４に高速圧サー
チ時に印加される駆動電圧波形、（ｂ）は（ａ）波形に
基づくビデオヘッド素子５の変位波形（バイモルフ素子
４の固有振動による雑変位成分を含む）、（ｃ）は振動
検知用圧電素子７の検出信号波形、（ｄ）はバイモルフ
素子４の固有振動波形、（ｅ）はバイモルフ素子４の固
有振動による雑変位成分を減衰せしめる成分（上記バイ
モルフ素子４の固有振動に対する逆位相の信号）を含有
したバイモルフ素子４の修正駆動電圧波形、（ｆ）は（
ｅ）波形に基づくノクイモルフ素子４の駆動が行なわれ
た時のビデオヘッド素子５の変位波形である。この（ｆ
）波形に示される如くバイモルフ素子４に対する駆動電
圧波形が修正されることによりビデオへノド素子５は良
好にトラッキングされる。FIG. 5 is a waveform diagram of each part of an embodiment of the rotary head device according to the present invention. (a) is the drive voltage waveform applied to the bimorph element 4 during high-speed pressure search, (b) is the displacement waveform of the video head element 5 based on the waveform (a) (including miscellaneous displacement components due to natural vibration of the bimorph element 4) , (c) is the detection signal waveform of the piezoelectric element 7 for vibration detection, (d) is the natural vibration waveform of the bimorph element 4, and (e) is the component that attenuates the miscellaneous displacement component due to the natural vibration of the bimorph element 4 (the above-mentioned bimorph element The corrected drive voltage waveform of the bimorph element 4, (f) is (
e) A displacement waveform of the video head element 5 when the noquimorph element 4 is driven based on the waveform. This (f
) By modifying the drive voltage waveform for the bimorph element 4 as shown in the waveform, the gutter element 5 can be tracked well in the video.
〈効 果〉
以上の本発明によればバイモルフ素子の固有振動成分を
減衰させることが出来るので上記ノくイモルフ素子の固
有振動に帰因するミストランキングを防止できる。その
際上記バイモルフ素子の中央面上に層設された平面状の
振動検知用圧電素子７によって上記バイモルフ素子の固
有振動を読み取るようにしているので上記検知用圧電素
子７の存在ニヨって上記バイモルフ素子の駆動に対する
支障を起こさせず良好なトラッキングが可能なものであ
る。<Effects> According to the present invention as described above, the natural vibration component of the bimorph element can be attenuated, so mistrunking caused by the natural vibration of the bimorph element described above can be prevented. At this time, since the natural vibration of the bimorph element is read by the planar vibration detection piezoelectric element 7 layered on the central plane of the bimorph element, the presence of the detection piezoelectric element 7 causes the bimorph to Good tracking is possible without causing any hindrance to driving the element.
第１図（ａ）は従来の回転ヘッド装置の側面断面図、１
♂（ｂ）はその平面図・第２図（・）は°従来の１デオ
−り付は部周辺の側面図、同図（ｂ）はその平面図、同
図（ｃ）はその正面図及び回路との接続構成を示す図、
第４図（ａ）は本発明に係る回転ヘッド装置の一実施例
のビデオヘッド素子の取り付は部周辺の平面図、同図（
ｌ〕）はその側面図及び回路との接続構成を示す図、第
５図は波形図である。
図中、１・上側シリンダ ２：下側シリンダ３−回転軸
４：バイモルフ素子
５：ビデオヘッド素子 ６：電極
７：振動検知用圧電素子
代理人 弁理士 福 士 愛 彦（他２名）第５図FIG. 1(a) is a side sectional view of a conventional rotating head device.
♂ (b) is a plan view of the same, Figure 2 (・) is a side view of the area around the conventional 1-de-orientation unit, (b) is a plan view of the same, and (c) is a front view of the same. and a diagram showing the connection configuration with the circuit,
FIG. 4(a) is a plan view of the mounting area of the video head element of one embodiment of the rotary head device according to the present invention;
1]) is a side view and a diagram showing the connection configuration with the circuit, and FIG. 5 is a waveform diagram. In the figure, 1: Upper cylinder 2: Lower cylinder 3 - Rotation axis 4: Bimorph element 5: Video head element 6: Electrode 7: Piezoelectric element for vibration detection Representative Patent attorney Aihiko Fukushi (and 2 others) No. 5 figure
Claims (1)
他端が自由に湾曲可能に設けられた平板状のバイモルフ
素子と、該バイモルフ素子の自由端に設置された磁気信
号読取素子と、前記バイモルフ素子の中央面上に層設さ
れ前記バイモルフ素子の固有振動を読み取る平面状の振
動検知用圧電素子と、該振動検知用圧電素子の出力信号
に基づいて前記バイモルフ素子の固有振動を減衰せしめ
る駆動信号を形成する手段とを備えだことを特徴とする
回転ヘッド装置。1. A rotatable flat bimorph element with one end fixed to a rotating shaft and the other end freely bendable, and a magnetic signal reading element installed at the free end of the bimorph element; a planar vibration-detecting piezoelectric element layered on the center surface of the bimorph element to read the natural vibration of the bimorph element; and a flat vibration-detecting piezoelectric element for attenuating the natural vibration of the bimorph element based on an output signal of the vibration-detecting piezoelectric element. A rotary head device comprising means for forming a drive signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58109849A JPS601620A (en) | 1983-06-17 | 1983-06-17 | Rotary head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58109849A JPS601620A (en) | 1983-06-17 | 1983-06-17 | Rotary head device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS601620A true JPS601620A (en) | 1985-01-07 |
Family
ID=14520746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58109849A Pending JPS601620A (en) | 1983-06-17 | 1983-06-17 | Rotary head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS601620A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4988139A (en) * | 1988-03-16 | 1991-01-29 | Asama Corporation | Retractable sun visor with variable shading for an automobile |
| JPH0552310A (en) * | 1991-08-22 | 1993-03-02 | Rinnai Corp | Burner for portable heater |
-
1983
- 1983-06-17 JP JP58109849A patent/JPS601620A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4988139A (en) * | 1988-03-16 | 1991-01-29 | Asama Corporation | Retractable sun visor with variable shading for an automobile |
| JPH0552310A (en) * | 1991-08-22 | 1993-03-02 | Rinnai Corp | Burner for portable heater |
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