JPS59160822A - Head driving mechanism - Google Patents

Head driving mechanism

Info

Publication number
JPS59160822A
JPS59160822A JP3526583A JP3526583A JPS59160822A JP S59160822 A JPS59160822 A JP S59160822A JP 3526583 A JP3526583 A JP 3526583A JP 3526583 A JP3526583 A JP 3526583A JP S59160822 A JPS59160822 A JP S59160822A
Authority
JP
Japan
Prior art keywords
head
fixed
rotating drum
drum
rotational axis
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
Application number
JP3526583A
Other languages
Japanese (ja)
Inventor
Katsumi Okada
克巳 岡田
Munehisa Takeda
宗久 武田
Mataichiro Kiso
木曽　又一郎
Koji Naemura
康次 苗村
Taizo Kojima
泰三 小島
Hitoshi Oota
斉 太田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3526583A priority Critical patent/JPS59160822A/en
Publication of JPS59160822A publication Critical patent/JPS59160822A/en
Pending legal-status Critical Current

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

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

PURPOSE:To allow a head to trace a recording track accurately by moving the head in the same direction with the rotational axis line of a rotary drum, and utilizing a moving coil and a permanent magnet. CONSTITUTION:One terminal of an elastic member 15 which extends toward the direction crossing the rotational axis line of the rotary drum 3 is fixed thereto, and the head 8 is fixed to the other terminal of the elastic member 15 and movable in the same direction with the rotational axis line of the rotary drum 3. One terminal of a connecting rod 18 is fixed to the elastic member 15 or a base metal 17 and the moving coil 19 is fixed to the other terminal. The permanent magnet 20 for generating an electromagnetic force to the coil 19 is arranged fixedly on the rotary drum 3. When a current is flowed to the coil 19 througha rotary transformer 9, the electromagnetic force operates and the head 8 moves in the rotational axis direction of the rotary drum 3. This operation is utilized to slide the head 8 in the rotational axis line direction of the rotary drum 3 even in case of the oscillation of the drum part 1 and vertical movement of a magnetic tape.

Description

【発明の詳細な説明】 この発明は、ビデオテープレコーダの回転ドラムに取付
けられるヘッドを駆動さるヘッド駆動機構に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head drive mechanism for driving a head attached to a rotating drum of a video tape recorder.

第１図は、従来のビデオテープレコーダのドラム部を示
す断面図である。図において、ドラム部１は、固定ドラ
ム２と回転ドラム３とから構成される。固定ドラム２内
には回転軸４がベアリング５を介して回転可能に支持さ
れている。回転軸４には第１のフランジ６が圧入されて
おり、この第１の７ランジ６に回転ドラム３が固定され
ている。FIG. 1 is a sectional view showing a drum section of a conventional video tape recorder. In the figure, a drum section 1 is composed of a fixed drum 2 and a rotating drum 3. A rotary shaft 4 is rotatably supported within the fixed drum 2 via a bearing 5. A first flange 6 is press-fitted into the rotating shaft 4, and the rotating drum 3 is fixed to the first flange 6.

したがって、回転ドラム３は固定ドラム２に対して回転
可能に支持されていることになる。Therefore, the rotating drum 3 is rotatably supported relative to the fixed drum 2.

また図示されるように、回転ドラム３の下部には、台金
７がたとえばねじ止めによって固定されており、この台
金７の先端部にヘッド８が固着されている。ヘッド８か
らの再生信号は、回転軸４のまわりに配置されたロータ
リトランス９によって取出される。また、第２の７ラン
ジ１０を介してロータマグネット１１が回転軸４に取付
けられており、このロータマグネット１１を回転させる
ように界磁コイル１２が取付けられている。Further, as shown in the figure, a base metal 7 is fixed to the lower part of the rotating drum 3 by, for example, screws, and a head 8 is fixed to the tip of the base metal 7. A reproduction signal from the head 8 is extracted by a rotary transformer 9 arranged around the rotation shaft 4. Further, a rotor magnet 11 is attached to the rotating shaft 4 via the second seven flange 10, and a field coil 12 is attached so as to rotate the rotor magnet 11.

以上のように構成されたドラム部を用いて第２図に示さ
れるデツキが構成される。磁気テープ１３はドラム部１
に斜めに巻掛けられて走行する。The deck shown in FIG. 2 is constructed using the drum section constructed as described above. The magnetic tape 13 is the drum part 1
It travels by being wrapped diagonally around it.

したがって、第３図に示されるように、磁気テープ１３
には斜状に延びた記録トラック１４が記録されることに
なる。Therefore, as shown in FIG.
A diagonally extending recording track 14 is recorded on the recording track 14 .

上述されたような従来のビデオテープレコニダのドラム
部には以下に述べるような欠点があった。The drum section of the conventional video tape recorder as described above has the following drawbacks.

すなわち、従来のドラム部の構成は、ヘッドと、そのヘ
ッドを取付けている回転ドラムとが堅く固定されている
ものであるの”で、ドラム部が振動したりテープが上下
動を起こしたりすると、磁気テープに形成される記録ト
ラックの直線性が阻害され、また再生時にヘッドが記録
トラックを正確に追跡することが困難となって画質が低
下する欠点があった。In other words, in the conventional structure of the drum unit, the head and the rotating drum to which the head is attached are firmly fixed, so if the drum unit vibrates or the tape moves up and down, This has disadvantages in that the linearity of the recording tracks formed on the magnetic tape is inhibited, and it becomes difficult for the head to accurately track the recording tracks during reproduction, resulting in a reduction in image quality.

この発明は、上述された欠点を解消するためになされた
ものであり、その主たる目的は、ドラム部が振動したり
あるいはテープが上下動したりしても、ヘッドが記録ト
ラックを正確に追跡することができるヘッド駆動機構を
提供することである。This invention was made to eliminate the above-mentioned drawbacks, and its main purpose is to enable the head to accurately track the recording track even if the drum section vibrates or the tape moves up and down. The object of the present invention is to provide a head drive mechanism that can perform the following functions.

この発明は、要約すれば、ヘッドが、回転ドラムに対し
てその回転軸線と同方向に移動可能となるように取付け
られており、ざらにムービングコイルと永久磁石とを利
用してヘッドが記録トラックを正確に追跡できるように
したヘッド駆動機構である。In summary, the present invention is such that a head is attached to a rotating drum so as to be movable in the same direction as its rotational axis, and a moving coil and a permanent magnet are used to move the head toward recording tracks. This is a head drive mechanism that enables accurate tracking.

この発明の上述の目的およびその他の目的と特徴は、図
面を参照して行なう以下の詳細な説明から一層明らかと
なろう。The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

第４図は、この発明に従ったヘッド駆ａｍ構を備えるド
ラム部を示す部分断面図である。第１図に示された従来
のドラム部との相違点は、ヘッド８の取付構造にある。FIG. 4 is a partial cross-sectional view showing a drum section equipped with a head drive mechanism according to the present invention. The difference from the conventional drum section shown in FIG. 1 lies in the mounting structure of the head 8.

すなわち、ヘッド８は、回転ドラム３に対してその回転
軸線と同方向に移動可能となるように取付けられている
。その取付は方の一例が第４図に示されるのであるが、
具体的には以下の構成となっている。すなわち、回転ド
ラム３には、回転ドラム３の回転軸線と交差する方向に
延びる弾性部材１５の一端が、たとえばねじ（図示せず
）によって固定される。弾性部材１５の他端にはヘッド
８が固定され、したがってこのヘッド８は回転ドラム３
に対してその回転軸線と同方向に移動可能となる。弾性
部材１５は、好ましくは弾性体１６と台金１７とから構
成される。That is, the head 8 is attached to the rotating drum 3 so as to be movable in the same direction as its rotational axis. An example of how to install it is shown in Figure 4.
Specifically, it has the following configuration. That is, one end of an elastic member 15 extending in a direction intersecting the rotational axis of the rotating drum 3 is fixed to the rotating drum 3 by, for example, a screw (not shown). A head 8 is fixed to the other end of the elastic member 15, and therefore this head 8 is attached to the rotating drum 3.
It becomes possible to move in the same direction as the axis of rotation. The elastic member 15 preferably includes an elastic body 16 and a base metal 17.

この場合、弾性体１６の一端が回転ドラム３に固定され
、弾性体１６の他端に台金１７の一端が固定される。そ
して、台金１７の他端にはヘッド８が固定される。In this case, one end of the elastic body 16 is fixed to the rotating drum 3, and one end of the base metal 17 is fixed to the other end of the elastic body 16. A head 8 is fixed to the other end of the base metal 17.

また、図示されるように、回転ドラム３内をその回転軸
線と同方向にＷＡｉｊｌｌ可能とされた連接棒１８が配
置されている。連接棒１８の一方端はヘッド８を保持す
る。具体的には、連接棒１８の一方端は弾性部材１５ま
たは台金１７に固定される。Further, as shown in the figure, a connecting rod 18 is disposed within the rotary drum 3 in the same direction as its rotational axis. One end of the connecting rod 18 holds the head 8. Specifically, one end of the connecting rod 18 is fixed to the elastic member 15 or the base metal 17.

そして、連接棒１８の他方端にはムービングコイル１９
が固定されている。回転ドラム３には、このムービング
コイル１９に電磁力を作用させるための永久磁石２０が
固定して配置される。A moving coil 19 is provided at the other end of the connecting rod 18.
is fixed. A permanent magnet 20 for applying an electromagnetic force to the moving coil 19 is fixedly arranged on the rotating drum 3.

以上のような構成のヘッド駆動機構が、ヘッドを記録ト
ラックに追跡させる動作について以下説明する。The operation of the head drive mechanism configured as described above to cause the head to follow the recording track will be described below.

上述された構成から明らかなように、ロータリトランス
９を介してムービングコイル１°９に電流を流すと電磁
力が作用す、る。そして、ヘッド８は回転ドラム３に対
してその回転軸線と同方向に移動可能に取付けられてい
るので、その電磁力によって回転ドラムの回転軸線方向
に移動する。この作用を利用すると、ドラム部１が振動
したりあるいは磁気テープが上下に動いたりする状態で
も、ヘッドを回転ドラムの回転軸線方向に摺動させて正
確に記録トラックを追跡させることができる。As is clear from the above-described configuration, when a current is passed through the moving coil 1°9 through the rotary transformer 9, an electromagnetic force acts. Since the head 8 is attached to the rotary drum 3 so as to be movable in the same direction as its rotational axis, the head 8 is moved in the direction of the rotational axis of the rotary drum by its electromagnetic force. By utilizing this effect, even when the drum section 1 vibrates or the magnetic tape moves up and down, the head can be slid in the direction of the rotational axis of the rotating drum to accurately track the recording track.

したがって、再生画質が向上する。Therefore, the reproduced image quality is improved.

より具体的に言うならば、ドラム部１が振動したりある
いは磁気テープが上下に動いたりしてヘッド８が起録ト
ラックから大きく外れると再生信号の出力レベルが低下
する。したがって、これを電気的に検知し、出力レベル
の低下に応じた電流をムービングコイル１９に流してヘ
ッド８を記録トラックに沿うように制御することによっ
て、ヘッド８を記録トラックに正確に沿わせて摺動させ
ることができる。More specifically, when the drum unit 1 vibrates or the magnetic tape moves up and down, causing the head 8 to deviate significantly from the recording track, the output level of the reproduced signal decreases. Therefore, by electrically detecting this and controlling the head 8 to follow the recording track by flowing a current corresponding to the decrease in the output level to the moving coil 19, the head 8 can be made to accurately follow the recording track. It can be slid.

以上のように、この発明によれば、ヘッドを回転ドラム
に対してその回転軸線と同方向に移動可能となるように
取付け、さらにムービングコイルと永久磁石とを利用し
てヘッドを回転ドラムの回転軸線と同方向に摺動させる
ものであるので、ヘッドを記録トラックに正確に追跡さ
せることができ、その結果再生画質を大幅に向上させる
ことができる。As described above, according to the present invention, the head is attached to the rotating drum so as to be movable in the same direction as the axis of rotation of the rotating drum, and the moving coil and the permanent magnet are used to move the head toward the rotation of the rotating drum. Since the head is slid in the same direction as the axis, the head can accurately track the recording track, and as a result, the reproduced image quality can be greatly improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、従来のビデオテープレコーダのドラム部を示
す断面図である。第２図は、ドラム部を組込んだデツキ
を示す斜視図である。第３図は磁気テープを示す正面図
であり、記録トラックがいかに形成されているかを示し
ている。第４図は、この発明に従ったヘッド駆動ａｍを
備えるドラム部を示す部分語ｉｉｉ′ｉ図である。 図において、１はドラム部、３は回転ドラム、８はヘッ
ド、１５は弾性部材、１６は弾性体、１７は台金、１８
は連接棒、１９はムービングコイル、２０は永久磁石を
示す。 代理人　葛　野　信　−（外１名）FIG. 1 is a sectional view showing a drum section of a conventional video tape recorder. FIG. 2 is a perspective view showing the deck incorporating the drum section. FIG. 3 is a front view of the magnetic tape, showing how recording tracks are formed. FIG. 4 is a partial diagram iii'i showing a drum section with a head drive am according to the invention. In the figure, 1 is a drum part, 3 is a rotating drum, 8 is a head, 15 is an elastic member, 16 is an elastic body, 17 is a base metal, 18
19 is a connecting rod, 19 is a moving coil, and 20 is a permanent magnet. Agent Shin Kuzuno - (1 other person)

Claims (1)

【特許請求の範囲】 （１）　ビデオテープレコーダの回転ドラムに取付けら
れるヘッドを駆動させるヘッド駆動機構であって、 前記ヘッドは、前記回転ドラムに対してその回転軸線と
同方向に移動可能となるように取付けられており、 前記回転ドラム内をその回転軸線と同方向に摺動可能と
された連接棒が配置されており、前記連接棒の一方端は
前記ヘッドを保持し、前記連接棒の他方端にはムービン
グコイルが固定されており、 前記回転ドラムには、前記ムービングコイルに゛電磁力
を作用させるための永久磁石が固定して配置される、ヘ
ッド駆動機構。 ・　（２）　前記回転ドラムには、前記回転ドラムの回
転軸線と交差する方向に延びる弾性部材の一端が固定さ
れ、 前記ヘッドは前記弾性部材の他端に固定されており、し
たがって前記ヘッドは前記回転ドラムに対してその回転
軸線と同方向に移動可能となる、特許請求の範囲第１項
記載のヘッド駆動機構。 （３）　前記弾性部材は、弾性体と合金とから構成され
ており、 前記弾性体の一端は前記回転ドラムに固定され、前記弾
性体の他端には前記台金の一端が固定され、前記台金の
他端には前記ヘッドが固定されるものであり、 前記連接棒の一方端は前記台金に固定される、特許請求
の範囲第２項記載のヘッド駆動機構。[Scope of Claims] (1) A head drive mechanism for driving a head attached to a rotating drum of a video tape recorder, wherein the head is movable relative to the rotating drum in the same direction as its rotation axis. A connecting rod is arranged so as to be able to slide within the rotating drum in the same direction as the axis of rotation thereof, one end of the connecting rod holds the head, and one end of the connecting rod holds the head. A moving coil is fixed to the other end, and a permanent magnet for applying an electromagnetic force to the moving coil is fixedly disposed on the rotating drum. - (2) One end of an elastic member extending in a direction intersecting the rotational axis of the rotating drum is fixed to the rotating drum, and the head is fixed to the other end of the elastic member, so that the head is fixed to the rotating drum. The head drive mechanism according to claim 1, which is movable relative to the rotating drum in the same direction as its rotation axis. (3) The elastic member is made of an elastic body and an alloy, one end of the elastic body is fixed to the rotating drum, one end of the base metal is fixed to the other end of the elastic body, and one end of the elastic body is fixed to the rotating drum. The head drive mechanism according to claim 2, wherein the head is fixed to the other end of the base metal, and one end of the connecting rod is fixed to the base metal.
JP3526583A 1983-03-02 1983-03-02 Head driving mechanism Pending JPS59160822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3526583A JPS59160822A (en) 1983-03-02 1983-03-02 Head driving mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3526583A JPS59160822A (en) 1983-03-02 1983-03-02 Head driving mechanism

Publications (1)

Publication Number Publication Date
JPS59160822A true JPS59160822A (en) 1984-09-11

Family

ID=12436967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3526583A Pending JPS59160822A (en) 1983-03-02 1983-03-02 Head driving mechanism

Country Status (1)

Country Link
JP (1) JPS59160822A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63152014A (en) * 1986-12-16 1988-06-24 Mitsubishi Electric Corp Video head driving device for vtr
JPS6430019A (en) * 1987-07-24 1989-01-31 Mitsubishi Electric Corp Rotary magnetic head device
JPH0344816A (en) * 1989-07-11 1991-02-26 Mitsubishi Electric Corp Tracking device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63152014A (en) * 1986-12-16 1988-06-24 Mitsubishi Electric Corp Video head driving device for vtr
JPS6430019A (en) * 1987-07-24 1989-01-31 Mitsubishi Electric Corp Rotary magnetic head device
JPH0344816A (en) * 1989-07-11 1991-02-26 Mitsubishi Electric Corp Tracking device

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