JPH01171152A - Rotary head type magnetic recording and reproducing device - Google Patents
Rotary head type magnetic recording and reproducing deviceInfo
- Publication number
- JPH01171152A JPH01171152A JP62330828A JP33082887A JPH01171152A JP H01171152 A JPH01171152 A JP H01171152A JP 62330828 A JP62330828 A JP 62330828A JP 33082887 A JP33082887 A JP 33082887A JP H01171152 A JPH01171152 A JP H01171152A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- rotary
- heads
- tape
- vibration
- 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.)
- Granted
Links
- 238000004804 winding Methods 0.000 abstract 4
- 238000000034 method Methods 0.000 abstract 2
- 230000002238 attenuated effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 238000005562 fading Methods 0.000 description 2
- SEPPVOUBHWNCAW-FNORWQNLSA-N (E)-4-oxonon-2-enal Chemical compound CCCCCC(=O)\C=C\C=O SEPPVOUBHWNCAW-FNORWQNLSA-N 0.000 description 1
- LLBZPESJRQGYMB-UHFFFAOYSA-N 4-one Natural products O1C(C(=O)CC)CC(C)C11C2(C)CCC(C3(C)C(C(C)(CO)C(OC4C(C(O)C(O)C(COC5C(C(O)C(O)CO5)OC5C(C(OC6C(C(O)C(O)C(CO)O6)O)C(O)C(CO)O5)OC5C(C(O)C(O)C(C)O5)O)O4)O)CC3)CC3)=C3C2(C)CC1 LLBZPESJRQGYMB-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、ビデオテープレコーダーの如き、磁気テープ
上に回転ヘッドを用いて信号を記録再生する回転ヘッド
型磁気記録再生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head type magnetic recording and reproducing apparatus, such as a video tape recorder, which uses a rotary head to record and reproduce signals on a magnetic tape.
従来の技術
ビデオテープレコーダー（以下ＶＴＲと称す）は近年ま
すます小形軽量化、高画質高音質化、多機能化が進んで
いる、それに伴って小型軽量化のだめの特殊小径シリン
ダー採用による多ヘツド化、高音質化のだめの回転オー
ディオ（以下ＦＭオーディオと称す）ヘッド付加、多機
能化のための特殊再生用専用ヘッド、回転消去ヘッドの
付加等により、回転ヘッドの数が大幅に増加してきてい
る。Conventional technology In recent years, video tape recorders (hereinafter referred to as VTRs) have become smaller and lighter, have higher image quality and higher sound quality, and have become more multifunctional. The number of rotary heads has increased significantly due to the addition of rotary audio (hereinafter referred to as FM audio) heads for higher sound quality, special reproduction heads for multi-functionality, rotary erasing heads, etc.
それに従って、同一フォーマットのＶＴＲにおいても、
その機種によって回転ヘッドの数がまちまちになってい
る。Accordingly, even on VTRs of the same format,
The number of rotating heads varies depending on the model.
このため、回転ヘッド数の違うＶＴＲ間での互換再生時
に回転ヘッドのテープへの突入及び離脱時に発生するテ
ープ振動の影響により再生画面の局部的な曲がシや色む
らが発生し、再生画質が著しく劣化していた。For this reason, when performing compatible playback between VTRs with different numbers of rotating heads, the tape vibrations that occur when the rotating head enters and leaves the tape may cause localized scratches or color irregularities on the playback screen, resulting in poor playback image quality. had deteriorated significantly.
発明が解決しようとする問題点
機種間での回転ヘッド数の違いに伴う大きな弊害として
、回転ヘッド数の違うＶＴＲ間での互換再生時に回転ヘ
ッドのテープへの突入及び離脱時に発生するテープ振動
の影響により再生画面の局部的な曲がシや色むらが発生
し、再生画質が劣化する原因は以下の通りである。回転
ドラムに巻回された磁気テープに回転ドラムに所定量突
出して取シ付けられた回転ヘッドが高速で突入、離脱す
る際の衝撃により、磁気テープに振動が発生する、発生
した磁気テープの振動はそのまま回転ヘッドと磁気テー
プの相対速度の変化となシ、記録信号及び再生信号の時
間軸変動となる。Problems to be Solved by the Invention A major problem associated with the difference in the number of rotating heads between models is the tape vibration that occurs when the rotating head enters and leaves the tape during compatible playback between VTRs with different numbers of rotating heads. The causes of the deterioration of the playback image quality, such as the occurrence of local scratches and color unevenness in the playback screen due to the influence, are as follows. When a rotating head, which is attached to a magnetic tape wound around a rotating drum so as to protrude a predetermined amount from the rotating drum, enters and leaves the rotating drum at high speed, the impact causes vibrations in the magnetic tape. This results in a change in the relative speed between the rotary head and the magnetic tape, and a change in the time axis of the recording signal and reproduction signal.
記録時と再生時における磁気テープと回転ヘッドの相対
速度変動のタイミング及び変動量が全く同一であれば、
再生信号の変化がなく再生画質には全く影響はないが、
記録時と再生時のヘッド数が違う場合や、記録時と再生
時の回転ヘッドの磁気テープへの突入、離脱のタイミン
グがずれた場合には、再生信号に時間軸変動が発生して
再生画面の曲がりとなったり、色副搬送波と再生映像信
号の位相関係が乱れて色相変動（色ずれ）が発生する。If the timing and amount of relative velocity fluctuations between the magnetic tape and the rotary head during recording and playback are exactly the same,
There is no change in the playback signal and there is no effect on the playback image quality, but
If the number of heads during recording and playback is different, or if the timing of the rotary head entering and exiting the magnetic tape during recording and playback is different, time axis fluctuations will occur in the playback signal and the playback screen will change. The phase relationship between the color subcarrier and the reproduced video signal is disturbed, resulting in hue fluctuation (color shift).
本発明は上述の問題点を鑑み、回転ヘッドの磁気テープ
への突入、離脱時に発生する磁気テープの振動を減少さ
せることによって、回転ヘッド数の違うＶＴＲ間で互換
再生しても再生画面に曲がり及び色すれか、はとんど発
生することなく、良好な再生画質を得ることのできる、
回転ヘッド型磁気記録再生装置の構成を提供するもので
ある。In view of the above-mentioned problems, the present invention reduces the vibration of the magnetic tape that occurs when the rotating head enters and leaves the magnetic tape, so that the playback screen can be distorted even when compatible with VTRs with different numbers of rotating heads. It is possible to obtain good playback quality with almost no color fading or fading.
The present invention provides a configuration of a rotary head type magnetic recording/reproducing device.
問題点を解決するだめの手段
複数個の回転ヘッドを有する回転ドラムへの磁気テープ
の巻き付けを、前記回転ヘッドの１フィールド画面形成
回転角度に対して、前記回転ヘッドの磁気テープへの突
入、離脱時の衝撃によって発生する磁気テープ振動の振
動波長のほぼ０．６倍のテープ長さに相当する角度のオ
ーバーラツプをもって巻き付けた回転ヘッド型磁気記録
再生装置である。Means for solving the problem The magnetic tape is wound around a rotary drum having a plurality of rotary heads, and the rotary head enters and leaves the magnetic tape in accordance with the rotation angle of the rotary head to form one field screen. This is a rotating head type magnetic recording/reproducing device in which the tape is wound with an angle of overlap corresponding to the tape length which is approximately 0.6 times the vibration wavelength of the magnetic tape vibration caused by the impact of time.
作 用
上述の手段によシ、前記回転ヘッドの磁気テープへの突
入時の衝撃によって発生する磁気テープの振動と前記回
転ヘッドの離脱時に発生する磁気テープの振動がお互い
にキャンセルされて総合的な磁気テープの振動が減少す
る。Effect: By using the above-described means, the vibration of the magnetic tape generated by the impact when the rotary head enters the magnetic tape and the vibration of the magnetic tape generated when the rotary head leaves the magnetic tape cancel each other out, resulting in a comprehensive effect. Vibration of magnetic tape is reduced.
実施例
本発明の一実施例を、第１図〜第４図を用いて説明する
。磁気テープ１が巻回され、一対の回転ビデオヘッド２
ａ、２ｂと、一対の回転オーディオヘッドｓａ、ｓｂを
有する回転ドラム４は、矢印入方向に１８０Ｏｒｐｍで
回転し第１図の００〜１８００間で１フイールドの画面
を形成する、また磁気テープ１はαＩ、α０のオーバー
ラツプをもって回転ドラムに巻回されている。この時、
各回転ヘッド２ａ、２ｂ、３ａ、３ｂの磁気テープ１へ
の突入部Ｂでの衝撃によって発生する磁気テープ１の振
動は各々第２図に示すＩ２ａ、Ｉ２ｂ、Ｉ３ａ。Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. A magnetic tape 1 is wound around a pair of rotating video heads 2.
A rotary drum 4 having a pair of rotary audio heads sa and sb and a pair of rotary audio heads sa and sb rotates at 180 rpm in the direction of the arrow to form one field screen between 00 and 1800 in FIG. It is wound around a rotating drum with an overlap of αI and α0. At this time,
The vibrations of the magnetic tape 1 caused by the impact at the entry point B of each rotary head 2a, 2b, 3a, 3b into the magnetic tape 1 are I2a, I2b, I3a shown in FIG. 2, respectively.
Ｉｓｂ となり連続的にはＩＴとなる、また磁気テープ
１からの離脱部Ｃでの衝撃によって発生する磁気テープ
１の振動は各々第３図に示す０２ａ。The vibration of the magnetic tape 1 caused by the impact at the separation point C from the magnetic tape 1 is 02a shown in FIG. 3, respectively.
０２ｂ、０３ａ、０３ｂとなり連続的にはＯＴとなる。02b, 03a, 03b and becomes OT continuously.
この時の磁気テープの振動の波長はλであシ、磁気テー
プ１のオーバーラツプα（α工＋α０）は振動波長λの
０．６倍に相当する量に設定しているので、突入部Ｂに
よる磁気テープ振動ＩＴと離脱部Ｃによる磁気テープ振
動ＯＴの振動波形には第４図に示すように０．５×λの
位相ずれがある。At this time, the wavelength of the vibration of the magnetic tape is λ, and the overlap α (α time + α0) of the magnetic tape 1 is set to an amount equivalent to 0.6 times the vibration wavelength λ. As shown in FIG. 4, there is a phase shift of 0.5×λ between the vibration waveforms of the magnetic tape vibration IT and the magnetic tape vibration OT caused by the separation section C.
従って突入部Ｂによる磁気テープ振動ＩＴの一成分と離
脱部Ｃによる磁気テープ振動ＯＴの十成分がキャンセル
されて総合的な磁気テープ振動波形は第４図Ｔのように
なり、実質的な磁気テープ振動を減少させる事ができる
。また実験上、突入部Ｂによる磁、気テープ振動は一成
分が大きく離脱部Ｃによる磁気テープ振動は十戒分が大
きい傾向にあるため、キャンセルによる振動減少効果は
より大きくなる。以上の構成と動作により、磁気テープ
振動による回転ヘッドと磁気テープの相対速度の変化が
殆ど発生せず、回転ヘッド数の異なるＶＴＲ間の互換再
生時にも、再生画面に曲がりゃ色ずれが全く起こらない
。従って如何なる再生条件下においても常に安定した良
好な再生画質を得ることが出来るものである。Therefore, one component of the magnetic tape vibration IT due to the entry part B and ten components of the magnetic tape vibration OT due to the detachment part C are canceled, and the overall magnetic tape vibration waveform becomes as shown in FIG. Vibration can be reduced. Furthermore, experiments have shown that one component of the magnetic tape vibration caused by the entry portion B tends to be large, and the magnetic tape vibration caused by the separation portion C tends to be large in magnitude, so that the vibration reduction effect due to cancellation becomes even greater. With the above configuration and operation, there is almost no change in the relative speed between the rotating head and the magnetic tape due to magnetic tape vibration, and even during compatible playback between VTRs with different numbers of rotating heads, no color shift occurs when the playback screen turns. do not have. Therefore, stable and good reproduced image quality can always be obtained under any reproduction conditions.
本実施例の回転ヘッド型磁気記録再生装置によれば、磁
気テープ３の跳ね上がりによって発生していた回転ヘッ
ド１と磁気テープ３の相対速度の変化が殆ど発生せず、
回転ヘッド数の異々るＶＴＲ間の互換再生時にも、再生
画面に曲がりや色ずれが全く起こらない。従って如何な
る再生条件下においても常に安定した良好な再生画質を
得ることが出来るものである。According to the rotary head type magnetic recording/reproducing apparatus of this embodiment, the change in the relative speed between the rotary head 1 and the magnetic tape 3 that occurs due to the bounce of the magnetic tape 3 hardly occurs.
Even during compatible playback between VTRs with different numbers of rotating heads, no distortion or color shift occurs on the playback screen. Therefore, stable and good reproduced image quality can always be obtained under any reproduction conditions.
発明の効果
本発明の回転ヘッド型磁気記録再生装置によれば、磁気
テープへの回転ヘッドの突入、離脱時に発生する磁気テ
ープ振動を大幅に減少させることが出来るため、回転ヘ
ッドと磁気テープの相対速度の変化が殆ど発生せず、回
転ヘッド数の異なるＶＴＲ間の互換再正時にも、再生画
面に曲がりや色ずれが全く起こらない。従って如何なる
再生条件下においても常に安定した良好な再生画質を得
ることが出来るものである。Effects of the Invention According to the rotary head type magnetic recording/reproducing device of the present invention, it is possible to significantly reduce magnetic tape vibrations that occur when the rotary head enters and leaves the magnetic tape. Almost no change in speed occurs, and even when resetting compatibility between VTRs with different numbers of rotating heads, no distortion or color shift occurs in the reproduced screen. Therefore, stable and good reproduced image quality can always be obtained under any reproduction conditions.
第１図は本発明の一実施例の要部平面図、第２図は回転
ヘッド突入時の磁気テープ振動波形図、第３図は回転ヘ
ッド離脱時の磁気テープ振動波形図、第４図は総合的な
磁気テープ振動波形図である。
１・・・・・−磁気テープ、２・・・・・回転ビデオヘ
ッド、３・・・・・・回転オーディオヘッド、４・・・
・・・回転ドラム、ａＩ、α０・山・・オーバーラツプ
部。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名ｌ−
砥気テープ
２α、２ｂ−一回転ごチオヘッド
３（１，３ｂ−Ｅｉ：Ｉ払オーデイオヘヅド４−一回転
ドラム
ベ１．べθ−オーバーラヅプ墾
第１図
第２図
第３図
第４図FIG. 1 is a plan view of essential parts of an embodiment of the present invention, FIG. 2 is a magnetic tape vibration waveform diagram when the rotary head enters, FIG. 3 is a magnetic tape vibration waveform diagram when the rotary head leaves, and FIG. 4 is a diagram of the magnetic tape vibration waveform when the rotary head leaves. It is a comprehensive magnetic tape vibration waveform diagram. 1...-Magnetic tape, 2... Rotating video head, 3... Rotating audio head, 4...
...Rotating drum, aI, α0, mountain...overlap part. Name of agent: Patent attorney Toshio Nakao and one other person
Abrasive tape 2α, 2b - One rotation head 3 (1, 3b - Ei: I-paid audio head 4 - One rotation drum head 1. Beta θ - Overlap depth Fig. 1 Fig. 2 Fig. 3 Fig. 4
Claims (1)
の巻き付けを、前記回転ヘッドの１フィールド画面形成
回転角度に対して、前記回転ヘッドの磁気テープへの突
入、離脱時の衝撃によって発生する磁気テープ振動の振
動波長のほぼ０．５倍のテープ長さに相当する角度のオ
ーバーラップをもって巻き付けたことを特徴とする回転
ヘッド型磁気記録再生装置。The magnetic tape is wound around a rotating drum having a plurality of rotating heads, and the magnetic tape is generated by an impact when the rotating head enters and leaves the magnetic tape with respect to the rotation angle of the rotating head to form one field screen. A rotary head type magnetic recording/reproducing device characterized in that the tape is wound with an overlap angle corresponding to a tape length approximately 0.5 times the vibration wavelength of the vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62330828A JP2574350B2 (en) | 1987-12-25 | 1987-12-25 | Rotating head type magnetic recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62330828A JP2574350B2 (en) | 1987-12-25 | 1987-12-25 | Rotating head type magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01171152A true JPH01171152A (en) | 1989-07-06 |
| JP2574350B2 JP2574350B2 (en) | 1997-01-22 |
Family
ID=18236997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62330828A Expired - Lifetime JP2574350B2 (en) | 1987-12-25 | 1987-12-25 | Rotating head type magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2574350B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03256257A (en) * | 1990-03-06 | 1991-11-14 | Alps Electric Co Ltd | Rotary head type magnetic recording and reproducing device |
-
1987
- 1987-12-25 JP JP62330828A patent/JP2574350B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03256257A (en) * | 1990-03-06 | 1991-11-14 | Alps Electric Co Ltd | Rotary head type magnetic recording and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2574350B2 (en) | 1997-01-22 |
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