JPH058485B2 - - Google Patents
Info
- Publication number
- JPH058485B2 JPH058485B2 JP58212501A JP21250183A JPH058485B2 JP H058485 B2 JPH058485 B2 JP H058485B2 JP 58212501 A JP58212501 A JP 58212501A JP 21250183 A JP21250183 A JP 21250183A JP H058485 B2 JPH058485 B2 JP H058485B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- rotating magnetic
- shaft
- head device
- motor
- 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
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 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
- G11B5/52—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 simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
- G11B33/08—Insulation or absorption of undesired vibrations or sounds
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、ヘリカルスキヤン方式のビデオテー
プレコーダ（VTR）用の回転磁気ヘツド装置の
構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to the structure of a rotating magnetic head device for a helical scan type video tape recorder (VTR).
ヘリカルスキヤン方式のビデオテープレコーダ
に使用される従来の回転磁気ヘツド装置は、固定
状態の上、下部シリンダの間に挿介された回転デ
イスクに、複数個の磁気ヘツドを取付けた構造を
有しているか、又は、固定状態の下部シリンダに
対して、上部シリンダは回転しえるようになつて
おり、この上部回転シリンダに複数個の磁気ヘツ
ドが取付けられた構造を有している。
A conventional rotating magnetic head device used in a helical scan video tape recorder has a structure in which a plurality of magnetic heads are attached to a rotating disk inserted between a fixed upper and lower cylinder. The upper cylinder is rotatable with respect to the lower cylinder, which is either fixed or fixed, and has a structure in which a plurality of magnetic heads are attached to the upper rotating cylinder.
上記いずれの構造の回転磁気ヘツド装置におい
ても、VTRの記録再生時は上、下部シリンダの
外周面に沿つて磁気テープが走行し、この磁気テ
ープに対して前記モータにより駆動される磁気ヘ
ツドがテープ幅方向に斜めにトレースする所謂ヘ
リキヤルスキヤンを行ない、磁気記録又は再生が
行なわれる。尚この記録、再生を行う場合には、
サーボ技術により時間的変動を極力小さくする必
要があり、時間的変動が大きい場合には、画面揺
れ、色むら等が発生し、VTRの基本性能に係わ
る重大な問題が発生する。 In any of the above-mentioned rotating magnetic head devices, a magnetic tape runs along the outer circumferential surfaces of the upper and lower cylinders during recording and playback of a VTR, and the magnetic head driven by the motor moves against the magnetic tape. Magnetic recording or reproduction is performed by performing a so-called helical scan in which the magnetic field is traced diagonally in the width direction. In addition, when performing this recording and playback,
It is necessary to use servo technology to minimize temporal fluctuations; if the temporal fluctuations are large, screen shaking, color unevenness, etc. will occur, causing serious problems related to the basic performance of the VTR.
ところで、上記のような回転磁気ヘツド装置で
は、モータのロータに一端が固定されたシヤフト
の他端に回転デイスク又は上部回転シリンダを結
合しており、これらシヤフトのばね特性及びこれ
らの慣性質量に起因する固有の捩れ振動が生じ
る。この捩り固有振動数がビデオ信号のスキヤニ
ング周波数と一致した場合には、前述したサーボ
技術では制御することのできない回転磁気ヘツド
共振が発生し、画面が激しくゆさぶられるという
不都合が生じる。
By the way, in the above-mentioned rotating magnetic head device, one end of the shaft is fixed to the rotor of the motor, and the other end is connected to a rotating disk or an upper rotating cylinder. A unique torsional vibration occurs. If this torsional natural frequency matches the scanning frequency of the video signal, rotational magnetic head resonance occurs that cannot be controlled by the servo technology described above, causing the problem that the screen is shaken violently.
この現象を回避するため、捩り固有振動数が前
記スキヤニング周波数からずれるように設計して
従来は上記不都合を回避していた。しかし、工作
上の寸法誤差等により、組上がつた回転磁気ヘツ
ド装置の前記固有振動数にはばらつきが生じ、前
記スキヤニング周波数と一致するものが出て来て
しまう。このため、従来は、組立後各装置を１個
１個検査して、共振を起こすものを抜き出し、こ
れらに特別な手段を講じて共振を起こさせないよ
うにしていた。このため、上記検査に多くの作業
工数を要するという欠点があつた。 In order to avoid this phenomenon, the above-mentioned disadvantage has conventionally been avoided by designing the torsional natural frequency to be deviated from the scanning frequency. However, due to dimensional errors during machining, etc., the natural frequency of the assembled rotating magnetic head device varies, and some of them coincide with the scanning frequency. For this reason, in the past, each device was inspected one by one after assembly, those that caused resonance were extracted, and special measures were taken to prevent them from causing resonance. For this reason, there was a drawback that the above-mentioned inspection required a large number of man-hours.
本発明の目的は、上記の欠点に鑑み、装置の捩
り固有振動数と回転磁気ヘツドのスキヤニング周
波数が一致しても画面上に影響を及ぼさない程度
に共振を抑えた回転磁気ヘツド装置を提供するこ
とにある。
SUMMARY OF THE INVENTION In view of the above drawbacks, an object of the present invention is to provide a rotating magnetic head device that suppresses resonance to such an extent that it does not affect the screen even if the torsional natural frequency of the device and the scanning frequency of the rotating magnetic head match. There is a particular thing.
本発明は、回転磁気ヘツド装置において、回転
磁気ヘツドを駆動するモータのロータ部に防振ゴ
ムを設けたもので、この防振ゴムによつて、装置
の捩り固有振動数と回転磁気ヘツドのスキヤニン
グ周波数が例え一致しても、これによる共振を軽
減させる構成とすることにより、上記目的を達成
するものである。
The present invention provides a rotating magnetic head device in which a vibration isolating rubber is provided on the rotor of a motor that drives the rotating magnetic head, and the vibration isolating rubber reduces the torsional natural frequency of the device and the scanning of the rotating magnetic head. Even if the frequencies match, the above object is achieved by using a configuration that reduces the resonance caused by this.
以下本発明の回転磁気ヘツド装置の一実施例を
図面に従つて説明する。第１図は本発明の回転磁
気ヘツド装置の一実施例を示す分解斜視図であ
る。固定された円筒状の下部シリンダ１と、この
下部シリンダ１に所定の間隙を介して回転可能に
円筒状の上部シリンダ２が配設されている。この
上部シリンダ２の外周部に磁気ヘツド３が取付ら
れ、又その中心部はシヤフト４に結合されてい
る。このシヤフト４は上、下部シリンダ２，１の
内部を通り、且つ、ラジアルモータのステータ５
内を貫通してラジアルモータのロータ６の中心部
にボス７を介して結合されている。ラジアルモー
タのロータ６はラジアルモータのステータ５の外
周部に所定の間隙を介して回転可能に配設され、
ラジアルモータのステータ５に発生する回転磁界
によつてその周囲を回転する。ラジアルモータの
ロータ６の駆動力はシヤフト４を介して上部シリ
ンダ２を回転させ、磁気ヘツド３を上、下部シリ
ンダ２、１の周面上に沿つて走行する磁気テープ
にヘリカル状にスキヤンさせる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotating magnetic head device according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of the rotating magnetic head device of the present invention. A cylindrical lower cylinder 1 is fixed, and a cylindrical upper cylinder 2 is rotatably disposed in the lower cylinder 1 with a predetermined gap therebetween. A magnetic head 3 is attached to the outer periphery of the upper cylinder 2, and the center thereof is connected to a shaft 4. This shaft 4 passes inside the upper and lower cylinders 2 and 1, and also passes through the stator 5 of the radial motor.
It penetrates through the inside and is connected to the center of the rotor 6 of the radial motor via a boss 7. The rotor 6 of the radial motor is rotatably disposed on the outer periphery of the stator 5 of the radial motor with a predetermined gap therebetween.
The stator 5 of the radial motor rotates around it due to the rotating magnetic field generated in the stator 5. The driving force of the rotor 6 of the radial motor rotates the upper cylinder 2 via the shaft 4, causing the magnetic head 3 to helically scan the magnetic tape running along the circumferential surfaces of the upper and lower cylinders 2 and 1.
第２図は第１図で示したラジアルモータのロー
タ６の詳細例を示した図である。このロータは中
心部を構成するＡ部と外周部を構成するＢ部の２
つの部分から成り、これら２つの部分は間に防振
ゴム８を介して一体に結合されている。なお、外
周部Ｂの内側にはステータ５に対する駆動力を発
生させるマグネツト９が取付けられている。 FIG. 2 is a diagram showing a detailed example of the rotor 6 of the radial motor shown in FIG. 1. This rotor consists of two parts: A part which constitutes the center part and B part which constitutes the outer peripheral part.
It consists of two parts, and these two parts are integrally connected with a vibration isolating rubber 8 interposed therebetween. Note that a magnet 9 for generating a driving force for the stator 5 is attached to the inside of the outer peripheral portion B.
本実施例によれば、回転磁気ヘツド装置の捩り
固有振動数と、上部シリンダ２及び磁気ヘツド３
から成る回転磁気ヘツドのスキヤニング周波数と
が例え一致しても、ロータ６に設けられている防
振ゴム８により共振を吸収して、VTR画面に影
響を及ぼさない程度に前記共振を抑えることがで
きる。従つて、回転磁気ヘツド装置の組立後の前
記共振に対する検査を省略することができ作業工
数を大幅に削減することができる。なお、本実施
例においても設計上は回転磁気ヘツド装置の捩り
固有振動数と回転磁気ヘツドのスキヤニング周波
数が一致しないようにしておくことは勿論であ
る。 According to this embodiment, the torsional natural frequency of the rotating magnetic head device, the upper cylinder 2 and the magnetic head 3
Even if the scanning frequency matches the scanning frequency of the rotating magnetic head consisting of . Therefore, the inspection for resonance after the rotating magnetic head device is assembled can be omitted, and the number of work steps can be significantly reduced. In this embodiment as well, it goes without saying that the torsional natural frequency of the rotary magnetic head device and the scanning frequency of the rotary magnetic head do not match in terms of design.
第３図は本発明の回転磁気ヘツド装置の他の実
施例の要部を示した断面図である。この実施例は
回転磁気ヘツドを駆動するモータにアキシヤルモ
ータを使用したものである。アキシヤルモータの
ロータ１０は、中心部Ａと外周部Ｂとの２つの部
分に分れこれら２つの部分が防振ゴム１１によつ
て一体に結合したものから成つている。なお、外
周部Ｂにはリング状のマグネツト１２が取付られ
ている。このロータ１０の中心に図示されないシ
ヤフトが結合され、このシヤフトの他端に第１図
で示したような回転磁気ヘツドが結合されてい
る。本実施例も、回転磁気ヘツド装置の捩り固有
振動数と回転磁気ヘツドのスキヤニング周波数が
一致しても、防振ゴム１１によりその共振を抑え
ることができ、前実施例と同様の効果がある。 FIG. 3 is a sectional view showing the main parts of another embodiment of the rotating magnetic head device of the present invention. In this embodiment, an axial motor is used as the motor for driving the rotating magnetic head. The rotor 10 of the axial motor is divided into two parts, a center part A and an outer peripheral part B, and these two parts are integrally joined by a vibration isolating rubber 11. Note that a ring-shaped magnet 12 is attached to the outer peripheral portion B. A shaft (not shown) is connected to the center of the rotor 10, and a rotating magnetic head as shown in FIG. 1 is connected to the other end of the shaft. In this embodiment as well, even if the torsional natural frequency of the rotating magnetic head device and the scanning frequency of the rotating magnetic head match, the resonance can be suppressed by the vibration isolating rubber 11, and the same effect as in the previous embodiment is achieved.
以上記述した如く本発明の回転磁気ヘツド装置
によれば、回転磁気ヘツドを駆動するモータのロ
ータ部に防振ゴムを設けることにより、装置の捩
り固有振動数と回転磁気ヘツドのスキヤニング周
波数とが一致してもVTRの画面上に影響を及ぼ
さない程度に前記共振を抑える効果がある。
As described above, according to the rotating magnetic head device of the present invention, the torsional natural frequency of the device and the scanning frequency of the rotating magnetic head are aligned by providing a vibration-proofing rubber on the rotor portion of the motor that drives the rotating magnetic head. This has the effect of suppressing the resonance to such an extent that it does not affect the screen of the VTR even if it is mixed.
第１図は本発明の回転磁気ヘツド装置の一実施
例を示した分解斜視図、第２図は第１図で示した
ロータの縦断面図、第３図は本発明の回転磁気ヘ
ツド装置の他の実施例の要部を示した縦断面図で
ある。
１……下部シリンダ、２……上部シリンダ、３
……磁気ヘツド、４……シヤフト、６，１０……
ロータ、８，１１……防振ゴム、９，１２……マ
グネツト。
FIG. 1 is an exploded perspective view showing an embodiment of the rotating magnetic head device of the present invention, FIG. 2 is a vertical sectional view of the rotor shown in FIG. 1, and FIG. FIG. 7 is a vertical cross-sectional view showing the main parts of another embodiment. 1...Lower cylinder, 2...Upper cylinder, 3
...Magnetic head, 4...Shaft, 6,10...
Rotor, 8, 11... Vibration-proof rubber, 9, 12... Magnet.
Claims (1)
たシヤフトと、このシヤフトの他端に結合されこ
のシヤフトを駆動するモータを具備して成る回転
磁気ヘツド装置において、前記シヤフトが結合さ
れる前記モータのロータ部は、シヤフト結合部を
中心とする環状の弾性体と、これより内側及び外
側の分割部とから構成され、これらが一体に成形
されて成ることを特徴とする回転磁気ヘツド装
置。1. A rotating magnetic head device comprising a shaft fixed to a rotating body with a magnetic head attached to one end, and a motor coupled to the other end of the shaft to drive the shaft, in which the shaft is coupled to the motor. A rotary magnetic head device characterized in that the rotor section is composed of an annular elastic body centered on a shaft coupling section and divided sections on the inside and outside of the annular elastic body, which are integrally molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21250183A JPS60106018A (en) | 1983-11-14 | 1983-11-14 | Rotary magnetic head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21250183A JPS60106018A (en) | 1983-11-14 | 1983-11-14 | Rotary magnetic head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60106018A JPS60106018A (en) | 1985-06-11 |
| JPH058485B2 true JPH058485B2 (en) | 1993-02-02 |
Family
ID=16623706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21250183A Granted JPS60106018A (en) | 1983-11-14 | 1983-11-14 | Rotary magnetic head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60106018A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6251516U (en) * | 1985-09-19 | 1987-03-31 | ||
| JPS63225913A (en) * | 1987-03-13 | 1988-09-20 | Victor Co Of Japan Ltd | Guide drum |
| KR0134455B1 (en) * | 1994-11-21 | 1998-04-22 | 배순훈 | Head drum assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738331B2 (en) * | 1979-06-13 | 1982-08-14 | ||
| JPS5856330B2 (en) * | 1979-12-31 | 1983-12-14 | 昭和電線電纜株式会社 | Method of manufacturing heat shrink tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738331U (en) * | 1980-08-13 | 1982-03-01 | ||
| JPS5856330U (en) * | 1981-10-07 | 1983-04-16 | 株式会社 明治ゴム化成 | Damper for recording head of magnetic recording device |
-
1983
- 1983-11-14 JP JP21250183A patent/JPS60106018A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738331B2 (en) * | 1979-06-13 | 1982-08-14 | ||
| JPS5856330B2 (en) * | 1979-12-31 | 1983-12-14 | 昭和電線電纜株式会社 | Method of manufacturing heat shrink tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60106018A (en) | 1985-06-11 |
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