JPH06223395A - Driving device of head - Google Patents

Driving device of head

Info

Publication number
JPH06223395A
JPH06223395A JP5250296A JP25029693A JPH06223395A JP H06223395 A JPH06223395 A JP H06223395A JP 5250296 A JP5250296 A JP 5250296A JP 25029693 A JP25029693 A JP 25029693A JP H06223395 A JPH06223395 A JP H06223395A
Authority
JP
Japan
Prior art keywords
head
arm
coil
optical system
fixed
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
Application number
JP5250296A
Other languages
Japanese (ja)
Other versions
JP2550284B2 (en
Inventor
Toshio Sugiyama
俊夫 杉山
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5250296A priority Critical patent/JP2550284B2/en
Publication of JPH06223395A publication Critical patent/JPH06223395A/en
Application granted granted Critical
Publication of JP2550284B2 publication Critical patent/JP2550284B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To provide a driving device of a head which is small in size and can execute both tracking and focusing simultaneously. CONSTITUTION:An optical system 11 for converging a light flux on a disk 10 is fixed to the vicinity of the fore end of a rotary arm 12 by leaf springs 13. Therefore the optical system 11 can move freely in the direction of the optical axis. The arm 12 is fixed to a base 17 by bearings 18 and can rotate freely. A focusing motion is conducted by the system being driven by a coil 15 fixed to the lower part of the system 11 and by a magnetic circuit 16. Tracking is driven by a tubular coil 14 fixed on the lateral side of the optical system 11. This coil 14 shows that it can rotate around the bearings 18, in a circular-arc gap formed by a magnet 20 and a magnetic path 19.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、光ディスク、光情報フ
ァイル等の所謂光情報処理装置に用いられるヘッド駆動
装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drive device used in so-called optical information processing devices such as optical disks and optical information files.

【0002】[0002]

【従来の技術】最近、高速にアクセスを行う場合に有利
な光学的走査装置として、スウイングアームと呼ばれる
ものが提案された。
2. Description of the Related Art Recently, what is called a swing arm has been proposed as an optical scanning device which is advantageous for high-speed access.

【0003】図1と図2にこの装置の概略を示す。レン
ズ1を含む光学系2は、支点4を中心に回転するアーム
3の1端部に固定されている。アーム3の他端には駆動
コイル5が固着してある。
1 and 2 show the outline of this device. An optical system 2 including a lens 1 is fixed to one end of an arm 3 that rotates around a fulcrum 4. The drive coil 5 is fixed to the other end of the arm 3.

【0004】図2に断面を示すように、駆動コイル5を
はさんで磁気回路6が配置されている。この駆動コイル
5に電気を通じることによりアーム3は磁気回路6の間
を自由に支点4を中心に動作する。この装置はディスク
(図示せず)の情報記録範囲の光学系走査をすべてカバ
ーできる。すなわち、情報トラックの一回転中の追従で
あるトラッキング走査と、そのディスクの記録範囲をス
パイラルの情報トラックに従ってゆっくり移動するとこ
ろの送り走査とを、この装置1つで兼用できるのであ
る。このため、装置が簡単になるとともに、アクセスタ
イムを短縮できる利点がある。
As shown in the sectional view of FIG. 2, a magnetic circuit 6 is arranged with the drive coil 5 in between. By supplying electricity to the drive coil 5, the arm 3 freely moves around the fulcrum 4 between the magnetic circuits 6. This device can cover all optical system scanning of the information recording area of a disc (not shown). That is, this device can be used for both the tracking scan, which is a follow-up during one rotation of the information track, and the feed scan, which slowly moves the recording range of the disc in accordance with the spiral information track. Therefore, there is an advantage that the device can be simplified and access time can be shortened.

【0005】而してスウイングアームに要求される条件
は、アームの共振周波が高いことである。これは、トラ
ッキング制御の精度やサーボの広帯域化と非常に密接な
関係にある。通常第1次共振周波数は、3000Hzも
しくはそれ以下で発生する。この共振はスウイングアー
ムを片持ち梁とした場合の第1次の曲げ共振である。通
常、駆動発生トルクに対する感度を上げるため、スウイ
ングアームの慣性質量をできるかぎり少なく、またその
曲げ剛性が大きくなるようにその構造を工夫していた
が、限界がある。この1つの原因は、共振周波数を上げ
るためにはアームの断面積を大きくすることにより可能
であるが、その場合はアーム全体が非常に大きなものに
なりすぎて感度の点で問題があることである。もう1つ
は、回転トルクを発生する駆動源と実際に光スポットで
読み出す光ヘッド部が回動中心に対して対向する構造に
なっているため、第1次共振を境に位相が反転してしま
うことである。以上述べた欠点が、ディスク回転を高速
化できない最大のネックになっている。
Therefore, the condition required for the swing arm is that the resonance frequency of the arm is high. This is very closely related to the accuracy of tracking control and widening of the servo band. Usually, the primary resonance frequency occurs at 3000 Hz or lower. This resonance is the first-order bending resonance when the swing arm is a cantilever. Usually, in order to increase the sensitivity to drive torque, the structure has been devised so that the inertial mass of the swing arm is as small as possible and its bending rigidity is large, but there is a limit. One reason for this is possible by increasing the cross-sectional area of the arm in order to increase the resonance frequency, but in that case, the entire arm becomes too large and there is a problem in terms of sensitivity. is there. The other is that the drive source that generates the rotation torque and the optical head that actually reads out with the light spot are opposed to the center of rotation, so that the phase is inverted at the boundary of the primary resonance. It is to end up. The above-mentioned drawbacks are the biggest bottleneck that cannot speed up disk rotation.

【0006】[0006]

【発明が解決しようとする課題】本発明は以上の欠点を
除去するためになされたもので、優れた周波数特性を有
し、高速アクセスの可能な光学系走査装置を提供するこ
とを目的とする。また、小型でトラッキング、フォーカ
シングの両方を同時に行ないうるヘッド駆動装置を提供
することを目的とする。
SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above drawbacks, and an object of the present invention is to provide an optical scanning device having excellent frequency characteristics and capable of high speed access. . It is another object of the present invention to provide a head drive device that is compact and can perform both tracking and focusing at the same time.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するため
に、本発明では、支点を中心に回動するアームに光ヘッ
ドを取付けトラッキング動作を行うヘッド駆動装置にお
いて、光ヘッドを弾性部材を介してフォーカシング方向
にのみ移動を許容するごとくアームの先端部付近に固着
し、トラッキング動作を行うためにアームを駆動する力
が、アームの回動支点に対して光学系を固着する側で、
アームの回動支点と光ヘッドを結ぶ線上の点にかかるこ
とを特徴とする。
In order to achieve the above object, according to the present invention, in a head drive device in which an optical head is attached to an arm that rotates about a fulcrum and a tracking operation is performed, the optical head is interposed via an elastic member. The force that drives the arm for tracking operation is fixed near the tip of the arm so that the optical system is fixed to the rotation fulcrum of the arm.
It is characterized in that it is applied to a point on the line connecting the rotation fulcrum of the arm and the optical head.

【0008】本願発明の第2の発明は、光ヘッドを記録
媒体上の所望の位置に位置決めするためのヘッド駆動装
置であって、光ヘッドの光学軸に対して傾斜するように
巻かれた第1のコイルと、第1のコイルと交叉すると同
時に光学軸に対しても傾斜するように巻かれた第2のコ
イルとを有し、2つのコイルに流す電流を制御すること
により、光ヘッドを駆動することを特徴とする。
A second invention of the present invention is a head driving device for positioning an optical head at a desired position on a recording medium, which is wound so as to be inclined with respect to the optical axis of the optical head. A first coil and a second coil that intersects with the first coil and is wound so as to be inclined with respect to the optical axis at the same time are provided, and by controlling the current flowing through the two coils, the optical head is It is characterized by driving.

【0009】[0009]

【作用】本願発明は、光ヘッドと支点との間に駆動点
(駆動コイル)を配置し、トラッキング駆動点を、動か
したい対象物である光ヘッド(可動部)近傍に設けるこ
とにより、トラッキング方向駆動力が可動部近傍に直接
加わり、アームや板バネの機械的共振の影響を受けにく
い。また、アームを駆動する力が、アームの回動支点に
対して光学系を固着する側で、アームの回動支点と光学
系を結ぶ線上の点にかかることによって、ねじれによる
ヘッドの振動がない。
According to the present invention, the driving point (driving coil) is arranged between the optical head and the fulcrum, and the tracking driving point is provided in the vicinity of the optical head (movable portion) which is the object to be moved, thereby making it possible to realize the tracking direction. The driving force is directly applied to the vicinity of the movable part and is less susceptible to the mechanical resonance of the arm and leaf spring. Further, the force for driving the arm is applied to a point on the line connecting the rotation fulcrum of the arm and the optical system on the side where the optical system is fixed to the rotation fulcrum of the arm, so that there is no vibration of the head due to twisting. .

【0010】また、本願発明の第2の構成によれば、小
型の構成でトラッキングとフォーカシングの動作を同時
に行ないうる光学系駆動装置を提供しうる。
Further, according to the second configuration of the present invention, it is possible to provide an optical system driving device capable of simultaneously performing tracking and focusing operations with a compact configuration.

【0011】[0011]

【実施例】以下実施例を図面により詳細に説明する。Embodiments will be described in detail below with reference to the drawings.

【0012】図3a及びbにスウイングアームをモデル
化し、その駆動源を従来のように、回動中心に対向して
設けた場合と、光ヘッドの付近に設けた場合の周波数特
性を示す。図3aは変化、図3bは位相特性を示す。破
線イは駆動源と変位検出点が回動中心と対向している従
来の例に相当する。実線ロは駆動源と変位検出点が回動
中に対して同一方向にあり、かつ近接にある場合であ
る。図から明らかなように図3bの場合多少周波数特性
に乱れはあるが、位相の反転が見られない。
FIGS. 3a and 3b show the frequency characteristics of a swing arm modeled and its drive source provided facing the center of rotation as in the prior art and when provided near the optical head. 3a shows the change and FIG. 3b shows the phase characteristic. The broken line a corresponds to a conventional example in which the drive source and the displacement detection point face the center of rotation. The solid line B represents the case where the drive source and the displacement detection point are in the same direction and close to each other during rotation. As is clear from the figure, in the case of FIG. 3b, the frequency characteristic is somewhat disturbed, but no phase inversion is observed.

【0013】共振状態をモデル化して示すと図4のよう
に示される。図において、Oが回転中心、D1が駆動
点、D2が変位検出点であり、一点鎖線が変形状態を示
す。
The resonance state is modeled and shown as shown in FIG. In the figure, O is the center of rotation, D 1 is the driving point, D 2 is the displacement detection point, and the alternate long and short dash line shows the deformed state.

【0014】図5に本発明の1実施例の平面図を示し、
図6にその縦断面図を示す。ディスク10に光束を集束
するための光学系11は、板バネ13で回転アーム12
の先端付近に固着されている。このため、光学系11
は、光軸方向に自由に動作可能になっている。また、ア
ーム12は、軸受18でベース17に固定され、自由に
回動できる。フォーカシング動作は、光学系11の下部
に固着されたコイル15と磁気回路16により、駆動さ
れることにより行なう。またトラッキングは光学系11
の横に固定された筒状のコイル14により駆動される。
このコイル14は、マグネット20と磁路19で構成さ
れた、円弧状のギャップの間を軸受18を中心に回動で
きることを示す。本発明の要旨は動作すべき光学系11
に直接駆動点があるために、従来のように、アームの機
械的共振やその他の影響をうけにくいという優れた特性
を持つ。また装置全体も小型にでき、安価である。
FIG. 5 shows a plan view of one embodiment of the present invention.
FIG. 6 shows a vertical sectional view thereof. The optical system 11 for focusing the light flux on the disk 10 includes a leaf spring 13 and a rotating arm 12.
Is fixed near the tip of the. Therefore, the optical system 11
Are freely movable in the optical axis direction. The arm 12 is fixed to the base 17 by the bearing 18 and can freely rotate. The focusing operation is performed by being driven by the coil 15 and the magnetic circuit 16 fixed to the lower part of the optical system 11. The tracking is performed by the optical system 11.
It is driven by a cylindrical coil 14 fixed to the side of.
This coil 14 is shown to be rotatable about the bearing 18 between the arcuate gaps formed by the magnet 20 and the magnetic path 19. The gist of the present invention is to operate the optical system 11
Since it has a direct drive point, it has an excellent characteristic that it is less susceptible to mechanical resonance of the arm and other influences as in the conventional case. In addition, the entire device can be made compact and inexpensive.

【0015】次に本発明の他の実施例を図7に示す。こ
の場合図5及び図6は光学系全体を動作してフォーカシ
ングをしていたのを、レンズ部21のみ駆動する場合を
示す。この場合に、フォーカシングすべき、質量が軽量
になっているので、駆動力が少なくて済む。
Next, another embodiment of the present invention is shown in FIG. In this case, FIGS. 5 and 6 show a case in which only the lens unit 21 is driven while the whole optical system is operated for focusing. In this case, since the mass to be focused is light, the driving force is small.

【0016】またさらに、本発明の他の実施例を図8及
び図9に示す。またコイル全体の斜視図を図10に示
す。本実施例は、トラッキングを行うための磁路を使っ
て、フォーカシングも行うのである。この場合駆動コイ
ルは、図9a及びbに示すように22a,22bと2つ
に分けてあり、互いに、X字になるように磁路に位置す
るようになっている。図9aに示すように、互いのコイ
ルに逆相に電気を通じると、2つのコイルの発生する合
力は、矢印で示すようなフォーカシング方向に作用す
る。また図9bに示すように同様に、同相に電気を通じ
ると、2つのコイルの発生する合力は矢印のトラッキン
グ方向に作用する。よって、1つの磁気ギャップによ
り、フォーカシングとトラッキングを行えるために、前
例より構造が簡単になる。この場合、2つのコイル22
a,22bが交わる角度を変えることにより、フォーカ
シングとトラッキングの駆動力のバランスを自由に設定
できる。図8に示すものは光学系全体をアクセスするも
のであるが、光学系の1部をアクセスすることも可能で
ある。
Furthermore, another embodiment of the present invention is shown in FIGS. A perspective view of the entire coil is shown in FIG. In this embodiment, focusing is also performed by using a magnetic path for tracking. In this case, the drive coil is divided into two parts, 22a and 22b, as shown in FIGS. 9a and 9b, and they are located in the magnetic path so as to form an X-shape. As shown in FIG. 9a, when electricity is applied to the coils in opposite phases, the resultant force generated by the two coils acts in the focusing direction as shown by the arrow. Similarly, as shown in FIG. 9b, when electricity is applied to the same phase, the resultant force generated by the two coils acts in the tracking direction indicated by the arrow. Therefore, since the focusing and tracking can be performed by one magnetic gap, the structure becomes simpler than that of the previous example. In this case, the two coils 22
By changing the angle at which a and 22b intersect, the balance between the focusing and tracking driving forces can be set freely. Although the one shown in FIG. 8 is for accessing the entire optical system, it is also possible to access a part of the optical system.

【0017】[0017]

【発明の効果】本発明は、以上のように、光学系に直接
駆動点があるために、優れた周波数特性を持つととも
に、高速にアクセス可能な、ヘッド駆動装置が実現でき
るものである。
As described above, the present invention can realize a head drive device which has an excellent frequency characteristic and can be accessed at high speed because the optical system has a direct drive point.

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

【図1】従来のスウイングアームの概略の上面図。FIG. 1 is a schematic top view of a conventional swing arm.

【図2】駆動コイルを示す断面図。FIG. 2 is a sectional view showing a drive coil.

【図3】それぞれスウイングアームの特性を説明するた
めのグラフ図。
FIG. 3 is a graph for explaining the characteristics of each swing arm.

【図4】スウイングアームの共振状態をモデル化して示
した模式図。
FIG. 4 is a schematic diagram showing a model of a resonance state of a swing arm.

【図5】本発明の一実施例の構成を示す平面図。FIG. 5 is a plan view showing the configuration of an embodiment of the present invention.

【図6】本発明の一実施例の構成を示す断面図。FIG. 6 is a sectional view showing the configuration of an embodiment of the present invention.

【図7】本発明の他の実施例の構成を示す断面図。FIG. 7 is a sectional view showing the structure of another embodiment of the present invention.

【図8】本発明の他の実施例の構成を示す断面図。FIG. 8 is a sectional view showing the structure of another embodiment of the present invention.

【図9】本願発明の他の実施例を説明するための断面
図。
FIG. 9 is a sectional view for explaining another embodiment of the present invention.

【図10】本願発明の他の実施例を説明するための斜視
図。
FIG. 10 is a perspective view for explaining another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

11…光学系、12…回動アーム、13…板バネ、14
…コイル、18…軸受、19…磁路、20…マグネッ
ト。
11 ... Optical system, 12 ... Rotating arm, 13 ... Leaf spring, 14
... coil, 18 ... bearing, 19 ... magnetic path, 20 ... magnet.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】支点を中心に回動するアームにヘッドを取
付けトラッキング動作を行うヘッド駆動装置において、
上記ヘッドを弾性部材を介して媒体垂直方向にのみ移動
を許容するごとく上記アームの先端部付近に固着し、ト
ラッキング動作を行うためにアームを駆動する力が、ア
ームの回動支点に対して上記光学系を固着する側で、ア
ームの回動支点と光学系を結ぶ線上の点にかかることを
特徴とするヘッド駆動装置。
1. A head drive device for mounting a head on an arm that rotates about a fulcrum and performing a tracking operation,
The head is fixed near the tip of the arm so that the head is allowed to move only in the vertical direction of the medium via the elastic member, and the force for driving the arm to perform the tracking operation is the force with respect to the pivot of the arm. A head drive device, characterized in that it is on a point on a line connecting a rotation fulcrum of an arm and an optical system on a side where the optical system is fixed.
【請求項2】媒体垂直方向への駆動を行なうためのコイ
ルが、トラッキング動作を行なうための磁気ギャップに
設けられたことを特徴とする特許請求の範囲第1項記載
のヘッド駆動装置。
2. A head drive device according to claim 1, wherein a coil for driving in the medium vertical direction is provided in a magnetic gap for performing a tracking operation.
【請求項3】ヘッドを記録媒体上の所望の位置に位置決
めするためのヘッド駆動装置であって、該ヘッドの媒体
垂直軸に対して傾斜するように巻かれた第1のコイル
と、該第1のコイルと交叉すると同時に上記垂直軸に対
して傾斜するように巻かれた第2のコイルとを有し、該
2つのコイルに流す電流を制御することにより、上記ヘ
ッドを駆動することを特徴とするヘッド駆動装置。
3. A head drive device for positioning a head at a desired position on a recording medium, comprising: a first coil wound so as to be inclined with respect to a medium vertical axis of the head; A second coil that intersects with one coil and is wound so as to be inclined with respect to the vertical axis at the same time, and drives the head by controlling a current flowing through the two coils. Head drive device.
JP5250296A 1993-10-06 1993-10-06 Head drive Expired - Lifetime JP2550284B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5250296A JP2550284B2 (en) 1993-10-06 1993-10-06 Head drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5250296A JP2550284B2 (en) 1993-10-06 1993-10-06 Head drive

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP22040684A Division JPS60121544A (en) 1984-10-22 1984-10-22 Optical system scanner

Publications (2)

Publication Number Publication Date
JPH06223395A true JPH06223395A (en) 1994-08-12
JP2550284B2 JP2550284B2 (en) 1996-11-06

Family

ID=17205801

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5250296A Expired - Lifetime JP2550284B2 (en) 1993-10-06 1993-10-06 Head drive

Country Status (1)

Country Link
JP (1) JP2550284B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59220406A (en) * 1983-05-26 1984-12-11 Sumitomo Rubber Ind Ltd Assembly of tire and rim for motorcycle
JPS60121544A (en) * 1984-10-22 1985-06-29 Hitachi Ltd Optical system scanner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59220406A (en) * 1983-05-26 1984-12-11 Sumitomo Rubber Ind Ltd Assembly of tire and rim for motorcycle
JPS60121544A (en) * 1984-10-22 1985-06-29 Hitachi Ltd Optical system scanner

Also Published As

Publication number Publication date
JP2550284B2 (en) 1996-11-06

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