JP2537913B2 - Rotating head type magnetic recording / reproducing device - Google Patents
Rotating head type magnetic recording / reproducing deviceInfo
- Publication number
- JP2537913B2 JP2537913B2 JP62276183A JP27618387A JP2537913B2 JP 2537913 B2 JP2537913 B2 JP 2537913B2 JP 62276183 A JP62276183 A JP 62276183A JP 27618387 A JP27618387 A JP 27618387A JP 2537913 B2 JP2537913 B2 JP 2537913B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- rotary head
- rotary
- vibration
- drum
- 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 - Lifetime
Links
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Television Signal Processing For Recording (AREA)
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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head type magnetic recording and reproducing apparatus for recording and reproducing signals on a magnetic tape using a rotary head, such as a video tape recorder.
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，画面質高音質化，多機能化が進んで
いる、それに伴って小型軽量化のための特殊小径シリン
ダー採用による多ヘッド化，高音質化のための回転オー
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。2. Description of the Related Art In recent years, video tape recorders (hereinafter referred to as VTRs) have become smaller and lighter, screen quality and sound quality have become more multifunctional, and along with this, multiple heads by adopting a special small diameter cylinder to reduce size and weight. The number of rotary heads has increased significantly due to the addition of rotary audio (hereinafter referred to as FM audio) heads for higher performance and higher sound quality, special playback dedicated heads for multiple functions, and rotation erase heads. There is.
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 in VTRs of the same format,
The number of rotary 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りや色む
らが発生し、再生画質が著しく劣化していた。Therefore, during compatible playback between VTRs with different numbers of rotary heads, local bending and color unevenness of the playback screen occur due to the effect of tape vibration that occurs when the rotary head enters and leaves the tape, and the playback image quality is remarkably high. It had deteriorated.
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りや色むらが発生
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
出して取り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、ヘッドドラム（回転ドラム及
び固定ドラム）上では、キャプスタン（テープ駆動部）
等の振動遮断部や固定ガイドポスト等の振動抑制部がな
いために、ヘッドドラム上のテープ全域に直接瞬間的に
伝わり、そのまま回転ヘッドと磁気テープの相対速度の
変化となり、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 One of the major problems caused by the difference in the number of rotating heads between models is that tape rotation 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 local distortion or color unevenness of the reproduction screen due to the influence and the deterioration of the reproduction image quality are as follows. Vibration occurs on the magnetic tape due to the impact when the rotary head protruding and attached to the rotary drum at a high speed enters and leaves the magnetic tape wound on the rotary drum. Capstan (tape drive) on the head drum (rotary drum and fixed drum)
Since there is no vibration blocking part such as a fixed guide post or a vibration suppressing part such as a fixed guide post, it is transmitted instantaneously directly to the entire tape on the head drum, and it becomes a change in the relative speed of the rotary head and the magnetic tape as it is, a recording signal and a reproduction signal. It becomes the time axis fluctuation of.
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 change in the relative speed of the magnetic tape and the rotary head during recording and reproduction are exactly the same, there is no change in the reproduction signal and there is no effect on the reproduction image quality, but the head during recording and reproduction is the same. If the numbers are different, or if the timings of the rotary head entering and leaving the magnetic tape during recording and playback are different, the playback signal may change over time, causing the playback screen to bend or color. The phase relationship between the subcarrier and the reproduced video signal is disturbed, resulting in hue fluctuation and color shift.
本発明は上述の問題点に鑑み、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ずれが、ほとんど発
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 problems, the present invention reduces the vibration of the magnetic tape that occurs when the rotary head rushes into and out of the magnetic tape, so that the playback screen bends even if compatible playback is performed between VTRs with different numbers of rotary heads. And, there is almost no color misregistration, and good reproduction image quality can be obtained.
A rotary head type magnetic recording / reproducing apparatus is provided.
問題点を解決するための手段 本発明は磁気テープが巻回され、複数個の回転ヘッド
を有する回転ドラムを回転自在に保持し、前記回転ヘッ
ドの磁気テープへの突入部及び離脱部の双方近傍に外周
面からの突出部を有する回転ドラムの、前記双方の突出
部の位置によって、前記回転ヘッドの磁気テープへの突
入位置及び離脱位置が決定されるよう構成し、前記回転
ヘッドの磁気テープへの突入位置及び離脱位置が、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、
巻回された磁気テープの巻回角度が、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つ位置になるよう前記
固定ドラムの突出部の位置を設定した回転ヘッド型磁気
記録再生装置である。Means for Solving the Problems According to the present invention, a magnetic tape is wound around and a rotary drum having a plurality of rotary heads is rotatably held, and both of a portion where the rotary head enters and leaves the magnetic tape. A rotary drum having a protrusion from the outer peripheral surface of the rotary head is configured such that the position of the protrusion and the position of detachment of the rotary head from the magnetic tape are determined by the positions of the both protrusions. The rush position and the withdrawal position of the
Overlap of the winding angle of the wound magnetic tape corresponds to a tape length of about 0.5 times the vibration wavelength of the magnetic tape vibration generated by the impact of the rotary head entering and leaving the magnetic tape. Is a rotary head type magnetic recording / reproducing apparatus in which the position of the protruding portion of the fixed drum is set so as to have a position.
作用 上述の手段により、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。According to the above-described means, the vibration of the magnetic tape caused by the impact when the rotary head enters the magnetic tape and the vibration of the magnetic tape generated when the rotary head separates are mutually canceled, and the overall magnetic tape Vibration is reduced.
実 施 例 本発明の一実施例を、第１図〜第５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
2a,2bと、一対の回転オーディオヘッド3a,3bを有する回
転ドラム４は、矢印Ａ方向に1800rpmで回転し第１図の
０゜〜180゜間で１フィールドの画面を形成する。また
磁気テープ１はαI,αＯのオーバーラップをもって回転
ドラムに巻回されている。この時、αI,αＯのオーバー
ラップは固定ドラム５の突入側突出部5I,離脱側突出部5
O,の位置で決定される。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３図に示すI2a,I2b,I3a,I3b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４図に示すO2a,O2b,O3a,O3b,となり連続的にはOTと
なる、この時の磁気テープの振動の波長はλであり、磁
気テープ１のオーバーラップα（αＩ＋αＯ）は振動波
長λの0.5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５図に示すように0.5×λの位
相ずれがある。従って突入部Ｂによる磁気テープ振動IT
の−成分と離脱部Ｃによる磁気テープ振動OTの＋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５
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−成分が大きく離脱部Ｃによる磁気テープ振動は
＋成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。Example An example of the present invention will be described with reference to FIGS. A pair of rotating video heads on which a magnetic tape 1 is wound
The rotary drum 4 having 2a and 2b and a pair of rotary audio heads 3a and 3b rotates in the direction of arrow A at 1800 rpm to form a screen of one field between 0 ° and 180 ° in FIG. The magnetic tape 1 is wound around a rotating drum with an overlap of αI and αO. At this time, the overlap of αI and αO is caused by the protrusion side 5I and the protrusion side 5 of the fixed drum 5.
It is determined by the position of O ,. The vibration of the magnetic tape 1 caused by the impact of the rotary heads 2a, 2b, 3a, 3b at the plunging part B into the magnetic tape 1 becomes I2a, I2b, I3a, I3b shown in FIG. Further, the vibration of the magnetic tape 1 generated by the impact at the detaching portion C from the magnetic tape 1 becomes O2a, O2b, O3a, O3b, respectively shown in FIG. 4, and becomes OT continuously, at this time. The vibration wavelength of the magnetic tape is λ, and the overlap α (αI + αO) of the magnetic tape 1 is set to an amount equivalent to 0.5 times the vibration wavelength λ. The vibration waveform of the magnetic tape vibration OT due to C has a phase shift of 0.5 × λ as shown in FIG. Therefore, the magnetic tape vibration IT due to the rush section B
Of the negative component and the + component of the magnetic tape vibration OT due to the detaching portion C are canceled, and the overall magnetic tape vibration waveform is
As shown in FIG. T, it is possible to substantially reduce the vibration of the magnetic tape. In the experiment, the magnetic tape vibration caused by the intruding portion B tends to have a large negative component and the magnetic tape vibration caused by the detaching portion C tends to have a large positive component. With the above configuration and operation,
Almost no change in the relative speed of the rotary head and the magnetic tape due to magnetic tape vibration occurs, and even when compatible playback is performed between VTRs with different numbers of rotary heads, no bending or color shift occurs on the playback screen. Therefore, a stable and good reproduction image quality can be always 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。また、実質的な磁気テープ
の巻き付け角（回転ヘッドの突入，離脱位置）が、固定
ドラムの突出部の位置で決定されるため、ドラムの取付
誤差や磁気テープ巻き付け角を決定するガイドポスト等
の取付位置の誤差の関わらず、常に確実に投入，離脱部
の磁気テープ振動をキャンセルできるものである。According to the rotary head type magnetic recording / reproducing apparatus of the present invention, the magnetic tape vibration generated when the rotary head enters and leaves the magnetic tape can be significantly reduced. Almost no change in speed occurs,
No bends or color shifts occur on the playback screen even during compatible playback between VTRs with different number of rotary heads. Therefore, a stable and good reproduction image quality can be always obtained under any reproduction conditions. Moreover, since the substantial winding angle of the magnetic tape (the position where the rotary head enters and leaves) is determined by the position of the protruding portion of the fixed drum, there is no error in mounting the drum or a guide post that determines the angle of winding the magnetic tape. It is possible to always reliably and reliably cancel the vibration of the magnetic tape at the loading / unloading portion regardless of the error in the mounting position.
第１図は本発明の一実施例の平面図、第２図は同実施例
のドラム外周展開図、第３図は本発明の一実施例の回転
ヘッド突入時の磁気テープ振動波形図、第４図は回転ヘ
ッド離脱時の磁気テープ振動波形図、第５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、５……固定ド
ラム、5I……突入側突出部、5O……離脱側突出部。FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a development view of the outer periphery of a drum of the same embodiment, and FIG. 3 is a waveform diagram of a magnetic tape vibration when a rotary head is inserted according to an embodiment of the present invention. FIG. 4 is a magnetic tape vibration waveform diagram when the rotary head is removed, and FIG. 5 is a comprehensive magnetic tape vibration waveform diagram. 1 ... Magnetic tape, 2 ... Rotating video head, 3 ... Rotating audio head, 4 ... Rotating drum, 5 ... Fixed drum, 5I ... Inrush side protrusion, 5O ... Removal side protrusion.
Claims (1)
ドを有する回転ドラムを回転自在に保持し、前記回転ヘ
ッドの磁気テープへの突入部及び離脱部の双方近傍に外
周面からの突出部を有する固定ドラムの、前記双方の突
出部の位置によって、前記回転ヘッドの磁気テープへの
突入位置及び離脱位置が決定されるよう構成し、前記回
転ヘッドの磁気テープへの突入位置及び離脱位置が、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、巻回された磁気テープの巻回角度が、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つ位置になるよう
前記固定ドラムの突出部の位置を設定したことを特徴と
する回転ヘッド型磁気記録再生装置。1. A magnetic tape is wound around and rotatably holds a rotary drum having a plurality of rotary heads, and the rotary head protrudes from the outer peripheral surface in the vicinity of both the protrusion part and the release part of the magnetic tape. The fixed drum having a portion is configured so that the positions of the rotary head to enter and leave the magnetic tape are determined by the positions of the two protrusions, and the position of the rotary head to enter and leave the magnetic tape. However, the winding angle of the wound magnetic tape with respect to the one-field screen forming rotation angle of the rotary head is the vibration of the magnetic tape vibration generated by the impact when the rotary head plunges into and out of the magnetic tape. A rotary head type magnetic device characterized in that the position of the protruding portion of the fixed drum is set so as to have a position having an angle overlap corresponding to a tape length of about 0.5 times the wavelength. Recording and reproducing apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62276183A JP2537913B2 (en) | 1987-10-30 | 1987-10-30 | Rotating head type magnetic recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62276183A JP2537913B2 (en) | 1987-10-30 | 1987-10-30 | Rotating head type magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01118255A JPH01118255A (en) | 1989-05-10 |
| JP2537913B2 true JP2537913B2 (en) | 1996-09-25 |
Family
ID=17565871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62276183A Expired - Lifetime JP2537913B2 (en) | 1987-10-30 | 1987-10-30 | Rotating head type magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2537913B2 (en) |
-
1987
- 1987-10-30 JP JP62276183A patent/JP2537913B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01118255A (en) | 1989-05-10 |
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