JPS59104722A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS59104722A JPS59104722A JP21278382A JP21278382A JPS59104722A JP S59104722 A JPS59104722 A JP S59104722A JP 21278382 A JP21278382 A JP 21278382A JP 21278382 A JP21278382 A JP 21278382A JP S59104722 A JPS59104722 A JP S59104722A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- tape
- magnetic
- displacement
- magnetic head
- 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)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は磁気ヘッドを電気機械変換手段によって回転ド
ラムに装置した形式の磁気記録再生装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording/reproducing apparatus in which a magnetic head is mounted on a rotating drum using electromechanical conversion means.
磁気記録再生装置においては、画質を向上させるために
、磁気ヘッドを電気機械変換手段によって回転ドラムに
装着している。この電気機械変換手段は磁気テープに記
録されているトラックを追跡するトラッキング機能を発
揮しているものである。この電気機械変換手段には一般
的にバイモルフ等の電歪素子が使用されている。との電
歪素子は印加電圧に対しヒステリシスを持った変位特性
を有している。そのため、磁気テープに信号を記録する
ときには、磁気ヘッドの位置を正確に定めることか困難
である。例えば、ＶＴＲの場合、トラックの幅は約２０
μｍであシ、装置間の互換性確保の観点から、記録時の
ヘッドの位置ずれは２〜３μｍ以下が要求される。In magnetic recording and reproducing devices, a magnetic head is attached to a rotating drum by electromechanical conversion means in order to improve image quality. This electromechanical conversion means exhibits a tracking function for tracking tracks recorded on the magnetic tape. As this electromechanical conversion means, an electrostrictive element such as a bimorph is generally used. The electrostrictive element has a displacement characteristic with hysteresis with respect to applied voltage. Therefore, when recording signals on a magnetic tape, it is difficult to accurately position the magnetic head. For example, in the case of a VTR, the track width is approximately 20
From the viewpoint of ensuring compatibility between devices, the positional deviation of the head during recording is required to be 2 to 3 μm or less.
したがって、電歪素子に取付けられた磁気ヘッドは、再
生時のみに使用し記録時には別の固定ヘッドを用いてい
る。Therefore, the magnetic head attached to the electrostrictive element is used only during reproduction, and another fixed head is used during recording.
本発明は上述の事柄にもとづいてなされたもので、記録
および再生を同一の電歪素子で実現しトラッキング精度
を向上させることができる磁気記録再生装置を提供する
ことを目的とする。The present invention has been made based on the above-mentioned problems, and an object of the present invention is to provide a magnetic recording and reproducing device that can realize recording and reproducing using the same electrostrictive element and improve tracking accuracy.
本発明は上記の目的を達成するために、磁気ヘッドを電
気機械変換手段によって回転ドラ４に装着し、回転ドラ
ムの外周に巻付けた磁気テープに情報を記録または再生
する磁気記録再生装置において、前記電気機械変換手段
の変位量を検出する手段と、この検出手段からの電気機
械変換手段の変位量によって記録および再生時に電気機
械変換手段のヒステリシス変位特性を補正する信号を電
気機械変換手段に出力する制御手段とを備えたものであ
る。In order to achieve the above object, the present invention provides a magnetic recording and reproducing apparatus in which a magnetic head is attached to a rotary drum 4 by an electromechanical conversion means, and information is recorded or reproduced on a magnetic tape wound around the outer periphery of the rotary drum. means for detecting the displacement amount of the electromechanical conversion means, and outputting a signal to the electromechanical conversion means for correcting the hysteresis displacement characteristic of the electromechanical conversion means during recording and reproduction based on the displacement amount of the electromechanical conversion means from the detection means. It is equipped with a control means to
以下本発明の実施例を図面をか照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の磁気記録再生装置の一例のドラム部分
を示すもので、図において１は磁気テープ、２は回転ド
ラム、３は固定ドラムである。回転ドラム２は回転軸４
に固定されている。５は軸受である。磁気テープ１に信
号を記録し、また再生する磁気ヘッド６は電歪素子７，
８の一方端に取付けられている。電歪素子７，８の他方
端は固定ブロック９，１０によって回転ドラムに固定さ
れている。電歪素子７．８は貼り合わせられ、それぞれ
に逆向きの電圧を印加されることによって、屈曲変形し
、その先端の磁気ヘッド６を記録トラックに追跡させる
。この電歪素子７，８は印加電圧に対しヒステリシスを
持った変位特性を有している。この電歪素子７，８の変
位を検出するために、静電容量形の変位検出器１１は電
歪素子７に対向するように回転ドラム２に取付けられて
いる。FIG. 1 shows a drum portion of an example of the magnetic recording/reproducing apparatus of the present invention. In the figure, 1 is a magnetic tape, 2 is a rotating drum, and 3 is a fixed drum. The rotating drum 2 is a rotating shaft 4
is fixed. 5 is a bearing. A magnetic head 6 for recording and reproducing signals on the magnetic tape 1 includes an electrostrictive element 7,
It is attached to one end of 8. The other ends of the electrostrictive elements 7 and 8 are fixed to the rotating drum by fixing blocks 9 and 10. The electrostrictive elements 7.8 are bonded together and are bent and deformed by applying voltages in opposite directions to each other, causing the magnetic head 6 at the tip thereof to track the recording track. The electrostrictive elements 7 and 8 have displacement characteristics with hysteresis with respect to applied voltage. In order to detect the displacement of the electrostrictive elements 7 and 8, a capacitive displacement detector 11 is attached to the rotating drum 2 so as to face the electrostrictive element 7.
この変位検出器１１の出力導線１１Ａは回転軸４に設け
たスリップリング１２全通して固定ブラシ１３に接続し
ている。固定ブラシ１３は増幅器１４全通して変位量検
出器１５に接続している。変位量検出器１５は切換スイ
ッチ１６によシ記録時補正信号元生器１７または再生時
補正信号発生器１８に接続している。切換スイッチ１６
は記録または再生信号によって切換えられる。図示の状
態における切換スイッチ１６は記録信号によシ記録時補
正信号発生器１７に接続している。この記録時補正信号
発生器１７および再生時補正信号発生器１８はそれぞれ
増幅器１９．２０を通して電歪素子７．８に接続してい
る。記録時補正信号発生器１７は変位量検出器１５から
の電歪素子７゜８の変位量によって記録用の補正信号を
電歪素子７、′８に加える。また再生時補正信号発生器
１８は先行モード発生手段２１からの走行モード信号と
変位量検出器１５からの信号との比較によシ補正信号を
電歪素子７，８に加える。An output conductor 11A of this displacement detector 11 passes through a slip ring 12 provided on the rotating shaft 4 and is connected to a fixed brush 13. The fixed brush 13 is connected to the displacement detector 15 through the amplifier 14 . The displacement detector 15 is connected to a recording correction signal generator 17 or a reproduction correction signal generator 18 through a changeover switch 16. Changeover switch 16
is switched by the recording or playback signal. The changeover switch 16 in the illustrated state is connected to a recording correction signal generator 17 according to the recording signal. The recording correction signal generator 17 and the reproduction correction signal generator 18 are connected to the electrostrictive element 7.8 through an amplifier 19.20, respectively. The recording correction signal generator 17 applies a recording correction signal to the electrostrictive elements 7,'8 based on the displacement amount of the electrostrictive elements 7.8 from the displacement amount detector 15. Further, the reproduction correction signal generator 18 applies a correction signal to the electrostrictive elements 7 and 8 by comparing the traveling mode signal from the preceding mode generating means 21 and the signal from the displacement amount detector 15.
次に上述した本発明の装置の一例の動作に説明する。Next, the operation of an example of the apparatus of the present invention described above will be explained.
磁気ヘッド３で磁気テープ１上の記録トラックを追跡す
る場合には、切換スイッチ１６は、再生時補正信号発生
器１８側に切換えられる。これにより、再生時補正信号
発生器１８は変位量検出器１５からの電歪素子７，８の
変位量信号と走行モード発生手段２１からの走行モード
信号とより、磁気テープ１０走行モードに応じて磁気ヘ
ッド６を記録ト２ツフを追跡させるように電歪素子７゜
８を屈曲変形させるだめの信号を、電歪素子７゜８に加
える。これにより磁気−、ラド６は走行モードに対応し
て磁気テープ１上の記録トラックを追跡する。その後、
切換スイッチ１６を第１図に示すように切換えて、磁気
テープ１に情報全記録する場合に、電歪素子７．８はヒ
ステリシスを持った変位特性を有しているので、磁気ヘ
ッド６は磁気テープ１上の正規の位置に保たれず、ずれ
を生じている。このずれは記録時補正信号発生器１７か
らの補正信号によって補正される。その結果、磁気ヘッ
ド６は磁気テープ１上の正規の位置に情変位検出器、１
５・・・変位量検出器、１６・・・切換スイッチ、１７
・・・記録時補正信号発生器、１８・・・再生時補正悟
ｇ発生器、２２・・・光検出器。When the magnetic head 3 tracks a recording track on the magnetic tape 1, the changeover switch 16 is switched to the playback correction signal generator 18 side. As a result, the reproduction correction signal generator 18 uses the displacement amount signals of the electrostrictive elements 7 and 8 from the displacement amount detector 15 and the running mode signal from the running mode generating means 21 to adjust the playback correction signal generator 18 according to the running mode of the magnetic tape 10. A signal is applied to the electrostrictive element 7.8 to bend and deform the electrostrictive element 7.8 so as to cause the magnetic head 6 to track the recording sheet 2. As a result, the magnetic tape 6 tracks the recording track on the magnetic tape 1 in accordance with the running mode. after that,
When the changeover switch 16 is switched as shown in FIG. 1 to record all information on the magnetic tape 1, the electrostrictive element 7.8 has a displacement characteristic with hysteresis, so the magnetic head 6 It is not maintained at the correct position on the tape 1 and is misaligned. This deviation is corrected by a correction signal from the correction signal generator 17 during recording. As a result, the magnetic head 6 has the information displacement detector 1 at the regular position on the magnetic tape 1.
5... Displacement amount detector, 16... Changeover switch, 17
. . . Correction signal generator during recording, 18 . . . Correction signal generator during reproduction, 22 . . . Photodetector.
■ １ 図 不Ｚ 図 第 ３ 口■ 1 Figure Non-Z diagram Third mouth
Claims (1)
に装着し、回転ドラムの外周に巻付けた磁気テープに情
報を記録または再生する磁気記録再生装置において、前
記電気機械変換手段の変位量を検出する手段と、この検
出手段からの電気機械変換手段の変位量によって記録お
よび再生時に電気機械変換手段のヒステリシス変位特性
を補正する信号を電気機械変換手段に出力する制御手段
とを備えたことを特徴とする磁気記録再生装置。 ２、検出手段は電気機械変換手段の変位を静電容量の変
化として検出するものであることを特徴とする特許請求
の範囲第１項記載の磁気記録再生装置。 ３、検出手段は電気機械変換手段の変位を光量の変化と
して検出するものであることを特徴とする特許請求の範
囲第１項記載の磁気記録再生装置。 ４、電気機械変換手段は電歪素子であることを特徴とす
る特許請求の範囲第１項ないし第３項のいずれかに記載
の磁気記録再生装置。[Scope of Claims] 1. In a magnetic recording and reproducing device in which a magnetic head is attached to a rotating drum by electromechanical converting means and information is recorded or reproduced on a magnetic tape wound around the outer periphery of the rotating drum, the electromechanical converting means and a control means for outputting a signal to the electromechanical conversion means to correct the hysteresis displacement characteristic of the electromechanical conversion means during recording and reproduction based on the displacement amount of the electromechanical conversion means from the detection means. A magnetic recording and reproducing device characterized by comprising: 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the detection means detects the displacement of the electromechanical conversion means as a change in capacitance. 3. The magnetic recording and reproducing apparatus according to claim 1, wherein the detection means detects the displacement of the electromechanical conversion means as a change in the amount of light. 4. The magnetic recording and reproducing apparatus according to any one of claims 1 to 3, wherein the electromechanical conversion means is an electrostrictive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21278382A JPS59104722A (en) | 1982-12-06 | 1982-12-06 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21278382A JPS59104722A (en) | 1982-12-06 | 1982-12-06 | Magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59104722A true JPS59104722A (en) | 1984-06-16 |
Family
ID=16628309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21278382A Pending JPS59104722A (en) | 1982-12-06 | 1982-12-06 | Magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59104722A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63253518A (en) * | 1986-12-19 | 1988-10-20 | シュラムバーガー アンデュストリエ | Apparatus for detecting position of magnetic head |
| JPH02230508A (en) * | 1989-03-03 | 1990-09-12 | Mitsubishi Electric Corp | Rotary magnetic head device for magnetic recording and reproducing device |
| JPH03288314A (en) * | 1990-04-04 | 1991-12-18 | Sharp Corp | Head position detector for rotary head type magnetic recording and reproducing device |
| US5684652A (en) * | 1992-07-17 | 1997-11-04 | Mitsubishi Denki Kabushiki Kaisha | Rotary magnetic head device using plural magnets and coils to position plural magnetic heads |
-
1982
- 1982-12-06 JP JP21278382A patent/JPS59104722A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63253518A (en) * | 1986-12-19 | 1988-10-20 | シュラムバーガー アンデュストリエ | Apparatus for detecting position of magnetic head |
| JPH02230508A (en) * | 1989-03-03 | 1990-09-12 | Mitsubishi Electric Corp | Rotary magnetic head device for magnetic recording and reproducing device |
| JPH03288314A (en) * | 1990-04-04 | 1991-12-18 | Sharp Corp | Head position detector for rotary head type magnetic recording and reproducing device |
| US5684652A (en) * | 1992-07-17 | 1997-11-04 | Mitsubishi Denki Kabushiki Kaisha | Rotary magnetic head device using plural magnets and coils to position plural magnetic heads |
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