JPH0677298B2 - Tracking drive - Google Patents

Tracking drive

Info

Publication number
JPH0677298B2
JPH0677298B2 JP1281406A JP28140689A JPH0677298B2 JP H0677298 B2 JPH0677298 B2 JP H0677298B2 JP 1281406 A JP1281406 A JP 1281406A JP 28140689 A JP28140689 A JP 28140689A JP H0677298 B2 JPH0677298 B2 JP H0677298B2
Authority
JP
Japan
Prior art keywords
magnetic head
mounting portion
tracking drive
photodetector
drive device
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 - Fee Related
Application number
JP1281406A
Other languages
Japanese (ja)
Other versions
JPH03141012A (en
Inventor
恵司 中村
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 JP1281406A priority Critical patent/JPH0677298B2/en
Publication of JPH03141012A publication Critical patent/JPH03141012A/en
Publication of JPH0677298B2 publication Critical patent/JPH0677298B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はVTRなどのテープに高密度で記録再生するた
めのトラッキング駆動装置に関するものである。さらに
詳しく述べると、磁気ヘッドと記録されたトラックのず
れを検出し、このずれ量に応じて正確に情報を再生する
ために磁気ヘッドを駆動する装置に関するものである。
The present invention relates to a tracking drive device for recording and reproducing a tape such as a VTR at a high density. More specifically, the present invention relates to a device that detects a deviation between a magnetic head and a recorded track and drives the magnetic head to accurately reproduce information according to the deviation amount.

〔従来の技術〕[Conventional technology]

第5図は例えば特開昭63−173219号公報に示された従来
のトラッキング駆動装置の断面図である。図において、
(1)は磁気ヘッド、(2)は円筒形コイルである制御
用コイル、(3)はコイルボビン、(4a),(4b)は円
形板バネであるジンバルばねである。ジンバルばね(4
a)は第6図に示すような形状で、内周部をコイルボビ
ン(3)の取付部(4c)とし、取付部(4c)より一方向
に延長部(4d)を設け、先端には磁気ヘッド(1)が接
着固定されている。ジンバルばね(4b)の内周部もコイ
ルボビン(3)の取付部(4c)とし、コイルボビン
(3)と一体に可動なよう固定されている。(5),
(6)は厚み方向に着磁された円柱状の永久磁石、
(7),(8),(9),(10)はヨークである。
FIG. 5 is a sectional view of a conventional tracking drive device disclosed in, for example, Japanese Patent Laid-Open No. 63-173219. In the figure,
(1) is a magnetic head, (2) is a control coil which is a cylindrical coil, (3) is a coil bobbin, and (4a) and (4b) are gimbal springs which are circular leaf springs. Gimbal spring (4
a) has a shape as shown in Fig. 6, the inner peripheral part is the mounting part (4c) of the coil bobbin (3), the extension part (4d) is provided in one direction from the mounting part (4c), and the tip is magnetic. The head (1) is adhesively fixed. The inner peripheral portion of the gimbal spring (4b) also serves as a mounting portion (4c) for the coil bobbin (3) and is fixed so as to be movable integrally with the coil bobbin (3). (5),
(6) is a cylindrical permanent magnet magnetized in the thickness direction,
(7), (8), (9) and (10) are yokes.

次に動作について説明する。Next, the operation will be described.

不図示の公知の方法で磁気ヘッド(1)とテープ上に記
録されたトラック間のずれを検出する。このトラックず
れの情報をもとに適当な電流を制御用コイル(2)に印
加する。制御用コイル(2)は永久磁石(5),(6)
およびヨーク(7),(8),(9),(10)により構
成される磁気回路中に配置されているので、電磁力によ
り図の矢印A方向に駆動され、コイルボビン(3)と一
体に可動であるジンバルばね(4a)、ひいては磁気ヘッ
ド(1)も同方向に駆動されトラックずれは解消され
る。
The shift between the magnetic head (1) and the tracks recorded on the tape is detected by a known method (not shown). An appropriate current is applied to the control coil (2) based on the information on the track deviation. The control coil (2) is a permanent magnet (5), (6)
And the yoke (7), (8), (9), and (10) are arranged in the magnetic circuit, so that they are driven in the direction of arrow A in the figure by the electromagnetic force and integrated with the coil bobbin (3). The movable gimbal spring (4a) and eventually the magnetic head (1) are also driven in the same direction, and the track deviation is eliminated.

[発明が解決しようとする課題] 従来のトラッキング駆動装置は以上のように構成されて
いるので、磁気ヘッド(1)の位置を知ることができな
い。それゆえ、可動ヘッドにて記録を行う場合、ヘッド
高さを特定することができず、ヘッド間段差が生じた
り、位置を固定することができずトラックが曲がってし
まうなどという問題点があった。
[Problems to be Solved by the Invention] Since the conventional tracking drive device is configured as described above, the position of the magnetic head (1) cannot be known. Therefore, when recording is performed with the movable head, there is a problem that the head height cannot be specified, a step between the heads occurs, the position cannot be fixed, and the track bends. .

この発明は上記のような問題点を解消するためになされ
たもので、ヘッド高さを調整でき、ヘッド間段差をなく
すことができると共に、記録時に電気的に位置を固定で
きるトラッキング駆動装置を得ることを目的とする。
The present invention has been made to solve the above problems, and provides a tracking drive device capable of adjusting the head height, eliminating the step difference between the heads, and electrically fixing the position during recording. The purpose is to

[課題を解決するための手段] この発明によるトラッキング駆動装置は、円形板バネの
磁気ヘッドを支持するため設けられた延長部と同じ形状
の延長部を反対側にも設けて反射面を形成すると共に、
反射面の対向する位置に光源と光検知器を設けたもので
ある。
[Means for Solving the Problems] In the tracking drive device according to the present invention, an extension having the same shape as the extension provided to support the magnetic head of the circular leaf spring is provided on the opposite side to form the reflection surface. With
A light source and a photodetector are provided at opposite positions of the reflecting surface.

〔作用〕[Action]

この発明におけるトラッキング駆動装置は、円形板にバ
ネに設けた磁気ヘッドの反対側に反射面を設けて、発光
素子の光源を上記反射面を介して2分割光検知器に入射
するようにしたので、2分割検知器に入射する光分布に
より磁気ヘッド位置を検出できる。
In the tracking drive device according to the present invention, the circular plate is provided with the reflecting surface on the opposite side of the magnetic head provided on the spring, and the light source of the light emitting element is made incident on the two-divided photodetector through the reflecting surface. The position of the magnetic head can be detected by the light distribution incident on the two-divided detector.

[発明の実施例] 以下、この発明の一実施例を図面にもとづいて説明す
る。第1図はこの発明の一実施例におけるトラッキング
駆動装置の要部斜視図、第2図は位置検出の原理説明
図、第3図および第4図はジンバルばね可動部の位置と
光検知器の出力の関係を示す図である。なお図におい
て、第5図と同一または相当部分には同一符号を付して
いる。
[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an essential part of a tracking drive device according to an embodiment of the present invention, FIG. 2 is an explanatory view of the principle of position detection, and FIGS. 3 and 4 are a position of a gimbal spring movable part and a photodetector. It is a figure which shows the relationship of an output. In the figure, the same or corresponding parts as those in FIG. 5 are designated by the same reference numerals.

図において、(101)は円形板バネであるジンバルばね
で、内周部より磁気ヘッド(1)を支持するために設け
られた延長部(101d)と同じ形状の延長部(101e)を18
0゜対向する側にも設け、先端には反射面である反射ミ
ラー(102)が固定されている。(103)は発光素子など
の光源、(104)は2分割光検知器である。
In the figure, (101) is a gimbal spring which is a circular leaf spring, and has an extension (101e) having the same shape as the extension (101d) provided for supporting the magnetic head (1) from the inner peripheral portion.
The reflecting mirror (102), which is also a reflecting surface, is fixed to the tip of the mirror, which is also provided on the side facing each other by 0 °. Reference numeral (103) is a light source such as a light emitting element, and reference numeral (104) is a two-divided photodetector.

次に動作について説明する。Next, the operation will be described.

第2図は第1図において一点鎖線B−Bに沿った一部の
断面図である。LEDもしくは半導体レーザなどの光源(1
03)より出射した光は反射ミラー(102)により反射
し、2分割光検知器(104)に入射する。2分割光検知
器(104)上の光強度分布は、第3図に示すようにな
る。第3図において、横軸は上記一点鎖線B上の位置で
ある。光源(103)は発散光源であり、光源(103)より
離れるにしたがって光強度分布は広がりピーク強度が低
下する。このため(b)に示したように、光源(103)
と反射ミラー(102)間の距離が近い場合には、光強度
分布は光源(103)近傍にかたよっており、光源(103)
に近い方の光検知器への入射光量が大きい。しかし、距
離が離れると(a)に示したようにピーク強度が低下
し、かつなだらかな分布となるので、光源(103)側の
光検知器への入射光量が低下して、反対側の光検知器へ
の入射光量は増加する。このため、2分割光検知器(10
4)の差をとった出力は第4図に示すようになり、位置
検出ができる。
FIG. 2 is a partial cross-sectional view taken along one-dot chain line BB in FIG. Light source such as LED or semiconductor laser (1
The light emitted from 03) is reflected by the reflection mirror (102) and enters the two-divided photodetector (104). The light intensity distribution on the two-division photodetector (104) is as shown in FIG. In FIG. 3, the horizontal axis is the position on the dashed line B. The light source (103) is a divergent light source, and the light intensity distribution spreads and the peak intensity decreases as the distance from the light source (103) increases. Therefore, as shown in (b), the light source (103)
When the distance between the light source and the reflection mirror (102) is short, the light intensity distribution is near the light source (103), and the light source (103)
The amount of light incident on the photodetector closer to is large. However, as the distance increases, the peak intensity decreases and the distribution becomes gentle as shown in (a), so the amount of light incident on the photodetector on the light source (103) side decreases and the light on the other side decreases. The amount of light incident on the detector increases. Therefore, the 2-split photodetector (10
The output obtained by taking the difference of 4) is as shown in FIG. 4, and the position can be detected.

なお、上記実施例では、光線を反射する手段として、反
射ミラーをシンバルばねに固定したが、これは反射テー
プを接着してもよいし、ジンバルばねの相当部にアルミ
蒸着を施したものを使用してもよい。
In the above embodiment, the reflection mirror is fixed to the cymbal spring as a means for reflecting the light beam, but this may be adhered with a reflection tape, or a portion corresponding to the gimbal spring which is vapor-deposited with aluminum is used. You may.

また、上記実施例では光源として発散光を使用する場合
について説明したが、平行光を出射するような光源を使
用しても同様の効果を得ることができる。
Further, although the case where divergent light is used as the light source has been described in the above embodiment, the same effect can be obtained by using a light source that emits parallel light.

[発明の効果] 以上のように、この発明によれば光学的手段を用いて磁
気ヘッドの位置を検出できるように構成したので、電気
的に可動部位置を固定する制御ができ、可動ヘッドによ
る記録時にトラック段差が生じたり、トラック曲がりが
生じるという問題点が解消された。また、アクチュエー
タに関してオブザーバを構成してアクチュエータ可動部
の速度を求めることができ、この情報をもとに共振点で
電気的ダンピングをかけることも可能になった。
[Effects of the Invention] As described above, according to the present invention, the position of the magnetic head can be detected by using the optical means. Therefore, it is possible to electrically control the position of the movable portion, and the movable head can The problems that a track step or a track bend occurs during recording have been solved. In addition, an observer can be configured for the actuator to obtain the speed of the movable portion of the actuator, and based on this information, electrical damping can be applied at the resonance point.

【図面の簡単な説明】[Brief description of drawings]

第1図はこの発明の一実施例によるトラッキング駆動装
置の要部斜視図、第2図は第1図のB−Bに沿った一部
の断面図、第3図および第4図はジンバルばね可動部の
位置と光検知器の出力の関係を示す図、第5図は従来の
トラッキング駆動装置の断面図、第6図は従来のトラッ
キング駆動装置のジンバルばねの斜視図である。 (1)……磁気ヘッド、(2)……円筒形コイル(制御
用コイル)、(3)……コイルボビン、(4c)……取付
部、(5),(6)……永久磁石、(7)〜(10)……
ヨーク、(101)……円形板バネ(ジンバルばね)、(1
02)……反射面(反射ミラー)、(103)……発光素子
(光源)、(104)……2分割光検知器。 なお、図中の同一符号は同一もしくは相当部分を示す。
1 is a perspective view of a main part of a tracking drive device according to an embodiment of the present invention, FIG. 2 is a partial sectional view taken along the line BB of FIG. 1, and FIGS. 3 and 4 are gimbal springs. FIG. 5 is a view showing the relationship between the position of the movable part and the output of the photodetector, FIG. 5 is a sectional view of a conventional tracking drive device, and FIG. 6 is a perspective view of a gimbal spring of the conventional tracking drive device. (1) ... magnetic head, (2) ... cylindrical coil (control coil), (3) ... coil bobbin, (4c) ... mounting part, (5), (6) ... permanent magnet, ( 7)-(10) ……
Yoke, (101) …… Circular leaf spring (gimbal spring), (1
02) …… Reflecting surface (reflection mirror), (103) …… Light emitting element (light source), (104) …… 2-split photodetector. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】コイルボビン取付部を有する1対の円形状
板バネと、上記取付部に取り付けられたコイルボビンに
嵌着された円筒形コイルと、ヨークと永久磁石とからな
り、かつこれらの間に環状ギャップを有した磁気回路と
を具備し、上記円形状板バネの一方には、上記コイルボ
ビン取付部と一体化した磁気ヘッド取付部を設け、1対
の円形状板バネを平行に一定の間隔をあけて配置し、上
記円筒形コイルを上記磁気回路の環状ギャップ内に配置
し、所定の電流を印加することにより磁気ヘッドを駆動
するトラッキング駆動装置において、 上記円形状板バネの磁気ヘッド取付部と対向する位置に
上記磁気ヘッド取付部とほぼ同じ形状の取付部を設け、
該取付部に反射面を有し、上記反射面に対向する位置に
発光素子と光検知器とを備え、該光検知器の出力より磁
気ヘッドの位置を検出することを特徴とするトラッキン
グ駆動装置。
1. A pair of circular leaf springs having a coil bobbin mounting portion, a cylindrical coil fitted to the coil bobbin mounted to the mounting portion, a yoke and a permanent magnet, and between them. A magnetic circuit having an annular gap is provided, and one side of the circular leaf spring is provided with a magnetic head attaching portion integrated with the coil bobbin attaching portion, and a pair of circular leaf springs are arranged in parallel at regular intervals. In the tracking drive device which drives the magnetic head by arranging the cylindrical coil in the annular gap of the magnetic circuit and applying a predetermined current, the magnetic head mounting portion of the circular leaf spring. A mounting portion having substantially the same shape as the magnetic head mounting portion is provided at a position facing
A tracking drive device characterized in that the mounting portion has a reflecting surface, a light emitting element and a photodetector are provided at positions facing the reflecting surface, and the position of the magnetic head is detected from the output of the photodetector. .
JP1281406A 1989-10-26 1989-10-26 Tracking drive Expired - Fee Related JPH0677298B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1281406A JPH0677298B2 (en) 1989-10-26 1989-10-26 Tracking drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1281406A JPH0677298B2 (en) 1989-10-26 1989-10-26 Tracking drive

Publications (2)

Publication Number Publication Date
JPH03141012A JPH03141012A (en) 1991-06-17
JPH0677298B2 true JPH0677298B2 (en) 1994-09-28

Family

ID=17638707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1281406A Expired - Fee Related JPH0677298B2 (en) 1989-10-26 1989-10-26 Tracking drive

Country Status (1)

Country Link
JP (1) JPH0677298B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102426419B (en) * 2011-11-25 2014-06-18 中国科学院光电技术研究所 Frequency response characteristic analyzing method of whole consisting of photoelectric tracking system and vibration isolating device

Also Published As

Publication number Publication date
JPH03141012A (en) 1991-06-17

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