JPH02270138A - Optical recording and reproducing device - Google Patents
Optical recording and reproducing deviceInfo
- Publication number
- JPH02270138A JPH02270138A JP9083889A JP9083889A JPH02270138A JP H02270138 A JPH02270138 A JP H02270138A JP 9083889 A JP9083889 A JP 9083889A JP 9083889 A JP9083889 A JP 9083889A JP H02270138 A JPH02270138 A JP H02270138A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- optical recording
- seek
- focus
- focus adjustment
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は、光デイスク等光記録媒体を使用して情報の記
録・再生、若しくは記録・再生・消去を行う光学的記録
再生装置に係わり、特に、正確なトラッキング制御が行
える光学的記録再生装置の改良に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording and reproducing device that records and reproduces information, or records, reproduces, and erases information using an optical recording medium such as an optical disk. In particular, the present invention relates to improvements in optical recording and reproducing devices that can perform accurate tracking control.
[従来の技術]
この種の光学的記録再生装置としては、第6図の構成概
略図に示されるように光源としての半導体レーザ(a>
と、この半導体レーザ(a)からの拡散レーザ光を平行
レーザ光に変換するコリメータレンズ(b)と、このレ
ーザ光のスポット形状を楕円形状から略円形状に変換す
るビーム整形プリズム(C)と、光記録媒体(d)に入
射する入射レーザ光と光記録媒体(d)から反射してく
る反射レーザ光とを分離するビームスプリッタ(e)と
、このビームスプリッタ(e)を通過し直線偏光である
レーザ光を円偏光に変換させる174波長板(f)と、
移動可能に設けられ上記174波長板(f)を通過した
レーザ光を光記録媒体(d)の収束面に収束させる対物
レンズ(g)と、上記ビームスプリッタ(e)により分
離された反射レーザ光をトラッキングエラー信号、フォ
ーカスエラー信号、並びに再生RF信号を得るための四
分割PINフォトダイオード(h)・へ入射させるシリ
ンドリカルレンズ(j)とでその主要部を構成する装置
が知られている。[Prior Art] This type of optical recording/reproducing device uses a semiconductor laser (a>
, a collimator lens (b) that converts the diffused laser beam from this semiconductor laser (a) into parallel laser beam, and a beam shaping prism (C) that converts the spot shape of this laser beam from an elliptical shape to a substantially circular shape. , a beam splitter (e) that separates the incident laser beam that enters the optical recording medium (d) and the reflected laser beam that is reflected from the optical recording medium (d); and a linearly polarized beam that passes through the beam splitter (e). a 174-wavelength plate (f) that converts laser light into circularly polarized light;
an objective lens (g) which is movably provided and converges the laser beam that has passed through the 174 wavelength plate (f) onto a converging surface of the optical recording medium (d); and a reflected laser beam separated by the beam splitter (e). A device is known in which the main part thereof is composed of a cylindrical lens (j) that makes the signal incident on a four-part PIN photodiode (h) for obtaining a tracking error signal, a focus error signal, and a reproduction RF signal.
そして、この光学的記録再生装置においては上記光記録
媒体(d)の偏心、並びに、表面の波打ち、反り等に対
処するため、上記四分割PINフォトダイオード(h)
にて求められたトラッキングエラー信号やフォーカスエ
ラー信号に基づいて光学ヘッドのトラッキング制御やフ
ォーカス制御を行ったり、あるいは、記録情報の読出し
のためにあるトラックから他のトラックへ光学ヘッドを
移動させるシーク制御等を行う必要があり、例えば、特
開昭63−50927号公報等に記載されているような
駆動系が組込まれている。In this optical recording/reproducing device, in order to deal with eccentricity of the optical recording medium (d), as well as surface undulation and warping, the four-part PIN photodiode (h)
Performs tracking control and focus control of the optical head based on the tracking error signal and focus error signal obtained in For example, a drive system such as that described in Japanese Patent Laid-Open No. 63-50927 is incorporated.
すなわち、この駆動系は第7図〜第8図に示すようにそ
の筒部内にヨーク(k)(k)が挿通され外周面にフォ
ーカスコイル(fc)とシークコイル(SC)とが巻回
されたボビン(m)(m)と、このボビン(m)(m)
に保持部材(n)(n)を介して取付けられた対物レン
ズ(Q)とから成るフォーカス調整可動部(p)と、こ
のフォーカス調整可動部(p)を搭゛載し光記録媒体(
d)の半径方向に沿って配置されたレール(Q)〜(Q
)上をベアリング(r)〜(r)を介し移動可能に設け
られたキャリッジ部(S)と、一端が上記フォーカス調
整可動部(p)に他端がキャリッジ部(S)に固定され
上記フォーカス調整可動部(p)を光記録媒体(d)面
の略垂直方向へ移動可能な状態で支持する板ばね(1)
とでその主要部が構成されるもので、上記シークコイル
(SC)への通電に伴いこのシークコイル(SC)に作
用する電磁力、すなわちシーク駆動力を上記板ばね(1
)を介してキャリッジ部(S)に伝達しキャリッジ部(
S)を光記録媒体(d)の半径方向に沿って移動操作し
てシーク制御とトラッキング制御とを行う一方、上記フ
ォーカスコイル(fc)への通電に伴いこのフォーカス
コイル(fc)に作用する電磁力、すなわちフォーカス
駆動力によりフォーカス調整可動部(p)を光記録媒体
(d)面の略垂直方向へ移動操作してフォーカス制御を
行うものであった。That is, in this drive system, as shown in Figs. 7 and 8, a yoke (k) (k) is inserted into the cylindrical part, and a focus coil (fc) and a seek coil (SC) are wound around the outer peripheral surface. bobbin (m) (m) and this bobbin (m) (m)
A focus adjusting movable part (p) consisting of an objective lens (Q) attached to the holding member (n) via a holding member (n), and an optical recording medium (p) equipped with this focus adjusting movable part (p).
d) rails (Q) to (Q
), the carriage part (S) is movably provided on the top of the focus adjusting part (p) through bearings (r) to (r), and one end is fixed to the focus adjustment movable part (p) and the other end is fixed to the carriage part (S), and the focus adjustment movable part (p) is fixed to the carriage part (S), and the other end is fixed to the carriage part (S). A leaf spring (1) that supports the adjustable movable part (p) in a movable state substantially perpendicular to the surface of the optical recording medium (d).
The main part is composed of the leaf spring (1), and the electromagnetic force that acts on the seek coil (SC) when the seek coil (SC) is energized, that is, the seek driving force, is transferred to the leaf spring (1).
) to the carriage part (S), and the carriage part (
Seek control and tracking control are performed by moving S) along the radial direction of the optical recording medium (d), while the electromagnetic force acting on the focus coil (fc) is Focus control is performed by moving the focus adjusting movable part (p) in a direction substantially perpendicular to the surface of the optical recording medium (d) using force, that is, focus driving force.
尚、図中(U)(U)は上記シークコイル(sc)とフ
ォーカスコイル(fc>側へ向う磁力線を形成する永久
磁石である。また、第9図は第7図〜第8図に示された
光学的記録再生装置における駆動系の機械的等価図で、
図中(fS)はフォーカス調整可動部(p)に作用する
シーク駆動力を、(f、)はフォーカス調整可動部(p
)に作用するフォーカス駆動力を夫々示している。Note that (U) and (U) in the figure are permanent magnets that form magnetic lines of force toward the seek coil (sc) and the focus coil (fc> side. This is a mechanical equivalent diagram of the drive system in the optical recording/reproducing device.
In the figure, (fS) represents the seek driving force acting on the focus adjustment movable part (p), and (f,) represents the seek drive force acting on the focus adjustment movable part (p).
) respectively show the focus driving force acting on them.
[発明が解決しようとする課題]
ところで、上述したように従来の光学的記録再生装置に
おける駆動系は、上記フォーカス調整可動部(p)のシ
ークコイル(SC)に作用する電磁力を板ばね(1)を
介してキャリッジ部(S)に伝達し、フォーカス調整可
動部(p)とキャリッジ部(S)とを光記録媒体(d)
の半径方向に沿って一体内に移動操作してシーク制御と
トラッキング制御とを行っているため、シークコイル(
SC)に流す電流の周波数をある周波数値より高くした
場合、すなわち、フォーカス調整可動部(p)とキャリ
ッジ部(S)とを微細振動させてトラッキング制御を行
うような場合、上記板ばね(1)を介してシークコイル
(SC)に作用する電磁力がキャリッジ部(S)に伝達
されなくなることがあった。[Problems to be Solved by the Invention] By the way, as described above, the drive system in the conventional optical recording/reproducing device uses the plate spring ( 1) to the carriage part (S), and connects the focus adjustment movable part (p) and the carriage part (S) to the optical recording medium (d).
The seek coil (
When the frequency of the current flowing through the plate spring (SC) is made higher than a certain frequency value, that is, when tracking control is performed by finely vibrating the focus adjustment movable part (p) and the carriage part (S), the above plate spring (1 ) The electromagnetic force acting on the seek coil (SC) may no longer be transmitted to the carriage portion (S).
このため、上記フォーカス調整可動部(p)とキャリッ
ジ部(S)とが一体内に移動しなくなって相対変位を起
こし、共振が発生して上記トラッキング制御を正確に行
えない問題点があった。For this reason, the focus adjustment movable part (p) and the carriage part (S) do not move into one body, causing relative displacement, and resonance occurs, resulting in the problem that the tracking control cannot be performed accurately.
尚、第10図〜第11図はある周波数値(数100〜数
kH2)において共振を起こすことを示したグラフ図で
あり、第10図はフォーカス調整可動部(1))並びに
キャリッジ部(S)とが振動している場合におけるフォ
ーカス調整可動部(p)のフォーカス方向の振幅と周波
数との関係を示したグラフ図、第11図はフォーカス調
整可動部(p)並びにキャリッジ部(S)とが振動して
いる場合におけるフォーカス調整可動部(p)の位相と
上記周波数との関係を示したグラフ図である。10 to 11 are graphs showing that resonance occurs at a certain frequency value (several 100s to several kHz), and FIG. 10 shows the focus adjustment movable part (1)) and carriage part (S ) is a graph showing the relationship between the amplitude and frequency in the focus direction of the focus adjustment movable part (p) when the focus adjustment movable part (p) and the carriage part (S) are vibrating. FIG. 4 is a graph diagram showing the relationship between the phase of the focus adjustment movable part (p) and the frequency when the focus adjustment movable part (p) is vibrating.
[i!題を解決するための手段]
本発明は以上の問題点に着目してなされたもの ゛で
、その課題とするところは、シークコイルに流す電流の
周波数値に拘らず正確なトラッキング制御が行える光学
的記録再生装置を提供することにある。[i! [Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems.The object of the present invention is to provide an optical system that can perform accurate tracking control regardless of the frequency value of the current flowing through the seek coil. The purpose of the present invention is to provide a recording and reproducing device that can be used for recording and reproducing data.
すなわち本発明は、光記録媒体の近傍に配置され光源か
らの集束光を光記録媒体の収束面に収束させる対物レン
ズと、この対物レンズを通電に伴う電磁力により光記録
媒体面の略垂直な方向に駆動するフォーカスコイルと、
上記対物レンズを通電に伴う電磁力により光記録媒体の
半径方向に駆動するシークコイルと、上記フォーカスコ
イルとシークコイルとを支持するコイル支持部とでその
主要部が構成され、これ等対物レンズ、フォーカスコイ
ル、シークコイル、及びコイル支持部とが一体的に固定
されたフォーカス調整可動部と、このフォーカス調整可
動部を搭載し光記録媒体の半径方向へ移動可能に設けら
れたキャリッジ部と、
一端がフォーカス調整可動部に他端が上記キャリッジ部
に固定され、上記フォーカス調整可動部を光記録媒体面
の略垂直な方向へ移動可能な状態で支持する板ばね、
とを備える光学的記録再生装置を前提とし、上記キャリ
ッジ部及びフォーカス調整可動部間には、光記録媒体の
半径方向で互いに向きが反対の作用力と反力をキャリッ
ジ部とフォーカス調整可動部に発生させる内力発生手段
を設けたことを特徴とするものである。In other words, the present invention includes an objective lens that is placed near an optical recording medium and that converges the focused light from a light source onto a converging surface of the optical recording medium, and an objective lens that is arranged approximately perpendicular to the surface of the optical recording medium by the electromagnetic force accompanying the energization of the objective lens. A focus coil that drives in the direction,
The main parts of the objective lens include a seek coil that is driven in the radial direction of the optical recording medium by electromagnetic force when the objective lens is energized, and a coil support section that supports the focus coil and the seek coil. A focus adjustment movable part in which a focus coil, a seek coil, and a coil support part are integrally fixed; a carriage part mounted with this focus adjustment movable part and provided so as to be movable in the radial direction of an optical recording medium; an optical recording/reproducing device comprising: a plate spring having a focus adjustment movable part and the other end fixed to the carriage part, and supporting the focus adjustment movable part in a movable state in a direction substantially perpendicular to the surface of the optical recording medium. Based on this premise, an internal force generating means is provided between the carriage part and the focus adjustment movable part to generate an acting force and a reaction force in opposite directions in the radial direction of the optical recording medium on the carriage part and the focus adjustment movable part. It is characterized by this.
この様な技術的手段において上記キャリッジ部及びフォ
ーカス調整可動部間に設ける内力発生手段は、キャリッ
ジ部に内力の一部を構成する作用力が作用しフォーカス
調整可動部にその反力が作用する構成であっても、ある
いはその逆で、キャリッジ部に反力が作用しフォーカス
調整可動部にその作用力が作用する構成であってもよく
任意である。In such a technical means, the internal force generating means provided between the carriage part and the focus adjustment movable part is configured such that an acting force forming part of the internal force acts on the carriage part and a reaction force thereof acts on the focus adjustment movable part. However, it is also possible to have an arbitrary configuration in which a reaction force acts on the carriage section and the force acts on the focus adjustment movable section, or vice versa.
そして、上記コイル支持部を、対物レンズが保持されそ
の外周面にフォーカスコイルが巻回されたレンズ保持体
と、このレンズ保持体の外周面に取付けられシークコイ
ルが巻回されたボビンとで構成した場合、上記内力発生
手段については、例えば、このボビンの筒部内に設けら
れその両端が上記キャリッジ部に取付けられると共に上
記フォーカスコイル側へ向う磁力線を形成するフォーカ
ス調整用磁石と、上記ボビンに巻回されたシークコイル
とでこれを構成することができる。尚、この構成におい
てはシークコイルを有するフォーカス調整可動部側に作
用力が作用し、キャリッジ部にはその反力が作用するこ
ととなる。The coil support section is composed of a lens holder that holds the objective lens and has a focus coil wound around its outer circumferential surface, and a bobbin that is attached to the outer periphery of the lens holder and has a seek coil wound around it. In this case, the internal force generating means may include, for example, a focus adjustment magnet provided in the cylindrical portion of the bobbin, both ends of which are attached to the carriage portion, and forming lines of magnetic force directed toward the focus coil, and a focus adjustment magnet wound around the bobbin. This can be configured with a rotated seek coil. In this configuration, an acting force acts on the focus adjustment movable section having the seek coil, and a reaction force acts on the carriage section.
ここで、この内力(f)、すなわち作用力又はその反力
の値は以下の要件を具備した場合に共振を防止すること
が可能となる。Here, resonance can be prevented when this internal force (f), that is, the value of the acting force or its reaction force, satisfies the following requirements.
すなわち、第3図の機械的等価図を用いてその要件を求
めると、フォーカス調整可動部(p)の質量をm1キャ
リッジ部(S)の質量をM1板ばね(1)のシータ方向
のばね定数をに1シーク駆動力をf3、上記内力をfと
し、かつフォーカス調整可動部(1))のシータ方向へ
の変位を×1キャリッジ部(S)のシータ方向への変位
をyとした場合、上記フォーカス調整可動部(p)とキ
ャリッジ部(S>の運動方程式は以下のようになる。In other words, when determining the requirements using the mechanical equivalent diagram in Fig. 3, the mass of the focus adjustment movable part (p) is m1 the mass of the carriage part (S) is M1 the spring constant of the leaf spring (1) in the theta direction. When the seek driving force is f3, the above internal force is f, and the displacement of the focus adjustment movable part (1) in the theta direction is x1, the displacement of the carriage part (S) in the theta direction is y. The equation of motion of the focus adjustment movable part (p) and the carriage part (S>) is as follows.
m(d x/dt2)+K(x−y)−f −fM
(d V/dt2)+K(y−x)−fこれをラプラ
ス変換してシーク駆動力に対するフォーカス調整可動部
(p)の変位の伝達関数を求めると次のようになる。m(d x/dt2)+K(x-y)-f-fM
(dV/dt2)+K(y-x)-f This is converted to Laplace to obtain the transfer function of the displacement of the focus adjustment movable part (p) with respect to the seek driving force, as follows.
但し、X、F、及びFは、X1f、f17)各S 々のラプラス変換を表わし、Sはラプラス変数である。However, X, F, and F are X1f, f17) each S , where S is a Laplace variable.
X(S)/FS (S)−
[(mMs + (m+M)K) +M” 52−M
(m+M)S2xF/F ]
xl/(mMs2+ (m+M)K)
x1/(m+M)S”
ここで、F (m+M)−F、・M
すなわち、f−f、・M/(m+M)に設定すると、上
記伝達関数は
X (S)/F、(S)−1/ (m+M)Sとなりこ
の関数にばね定数Kが関係しなくなるため上記共振は発
生しなくなる。X(S)/FS (S)- [(mMs + (m+M)K) +M" 52-M
(m+M) S2 , the above-mentioned transfer function becomes X (S)/F, (S)-1/ (m+M)S, and the spring constant K is no longer related to this function, so that the above-mentioned resonance no longer occurs.
従って、上記ボビンに巻回するシークコイルの巻数やフ
ォーカス調整用磁石、シーク調整用磁石の磁力強度を適
宜調整して、
f−f、−M/(m+M)となるように設定することで
上記共振を確実に防止することが可能となる。Therefore, by appropriately adjusting the number of turns of the seek coil wound around the bobbin, the magnetic strength of the focus adjustment magnet, and the seek adjustment magnet, and setting it so that f-f, -M/(m+M), the above-mentioned result can be achieved. It becomes possible to reliably prevent resonance.
[作用]
上述したような技術的手段によれば、上記フォーカス調
整可動部のシークコイルに作用するシーク駆動力を利用
せずにキャリッジ部及びフォーカス調整可動部に内力発
生手段を設け、この内力の一方を構成する作用力又は他
方の反力を利用して上記キャリッジ部を駆動するため、
上記シークコイルに流す電流の周波数値に拘らず共振の
発生を確実に防止することが可能となる。[Operation] According to the above-mentioned technical means, an internal force generating means is provided in the carriage part and the focus adjustment movable part without using the seek driving force acting on the seek coil of the focus adjustment movable part, and this internal force is generated. In order to drive the carriage part using the action force of one or the reaction force of the other,
It is possible to reliably prevent resonance from occurring regardless of the frequency value of the current flowing through the seek coil.
[実施例]
以下、本発明の実施例について図面を参照して詳細に説
明すると、この実施例に係る光学的記録再生装置は第1
図〜第2図に示すようにフォーカス調整可動部(p)と
、このフォーカス調整可動部(p)を搭載するキャリッ
ジ部(S)と、このキャリッジ部(S)とフォーカス調
整可動部[))とを接続する板ばね(1)とでその主要
部を構成するものである。[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
As shown in Figures to Figure 2, there is a focus adjustment movable section (p), a carriage section (S) on which the focus adjustment movable section (p) is mounted, and this carriage section (S) and the focus adjustment movable section [)). The main part thereof is a leaf spring (1) that connects the two.
まず、上記フォーカス調整可動部(p)は対物レンズ(
1)と、この対物レンズ(1)を保持し断面略矩形状で
筒状のレンズ保持体(2)と、このレンズ保持体(2)
の外周面に取付けられた一対のボビン(3)と、上記レ
ンズ保持体(2)の外周面に巻回されたフォーカスコイ
ル(4)と、上記ボビン(3)の外周面に巻回されたシ
ークコイル(5)とで構成され、これ等が一体的に固定
されているものである。また、上記レンズ保持体(2)
はその上部において対物レンンズ(1)が嵌合されその
中央部の内径が他の部位より小さい筒状の内側ハウジン
グ(21)と、この外側に連結板(6)を介して配設さ
れその外周面にフォーカスコイル(4)が巻回された筒
状の外側ハウジング(22)とで構成されており、これ
等内側並びに外側ハウジング(21) (22)間に
は上記キャリッジ部(S)のキャリッジ本体(7)の一
部が介装される隙間部(8)が形成されている。また、
上記ボビン(3)の筒部内には図示外の光記録媒体の半
径方向に沿って配設された一対のレール(9)(9)が
挿通されており、かつ上記ボビン(3)の外側にはこの
ボビン(3)の外周面に巻回されたシークコイル(5)
(5)側へ向う磁力線を形成するシーク調整用の永久磁
石(10) (10)がそのN極をボビン(3)側に
向は上記レール(9)(9)の長さ方向に沿って配設さ
れている。First, the focus adjustment movable part (p) is connected to the objective lens (
1), a cylindrical lens holder (2) with a substantially rectangular cross section that holds this objective lens (1), and this lens holder (2).
a pair of bobbins (3) attached to the outer circumference of the lens holder (2), a focus coil (4) wound around the outer circumference of the lens holder (2), and a focus coil (4) wound around the outer circumference of the bobbin (3). It is composed of a seek coil (5) and these are integrally fixed. In addition, the lens holder (2)
has a cylindrical inner housing (21) into which the objective lens (1) is fitted in the upper part and whose inner diameter at the center part is smaller than the other parts, and a cylindrical inner housing (21) which is disposed on the outside through a connecting plate (6) and whose outer periphery is It consists of a cylindrical outer housing (22) with a focusing coil (4) wound around its surface, and a carriage of the carriage part (S) is disposed between these inner and outer housings (21) and (22). A gap (8) is formed in which a part of the main body (7) is inserted. Also,
A pair of rails (9) (9) disposed along the radial direction of an optical recording medium (not shown) are inserted into the cylindrical portion of the bobbin (3), and are provided on the outside of the bobbin (3). is the seek coil (5) wound around the outer circumferential surface of this bobbin (3).
(5) The permanent magnet (10) for seek adjustment that forms lines of magnetic force toward the side (10) has its N pole facing the bobbin (3) side along the length direction of the rails (9) (9). It is arranged.
一方、上記キャリッジ部(S)は、キャリッジ本体(7
)と、このキャリッジ本体(7)に取付けられた一対の
フォーカス調整用の永久磁石(30)とで構成され、上
記キャリッジ本体(7)の略中央は筒部(31)となっ
ており、この筒部(31)が上記レンズ保持体(2)の
内側並びに外側ハウジング(21) (22)の隙間
部(8)に介装され、この筒部(31)の内壁と内側ハ
ウジング(21)の外壁とが摺動可能に面接触している
。また、上記フォーカス調整用の永久磁石(30)は上
記ボビン(3)の筒部内にそのN極をフォーカスコイル
(4)側に向けて配設されており、かつ、その両端部は
上記キャリッジ本体(7)に取付けられている。更に、
上記キャリッジ本体(7)の上下各回箇所の端部にはベ
アリング(32)〜(32)が取付けられており、この
ベアリング(32)〜(32)が上記レール(9)(9
)に係合してキャリッジ部(S)は光記録媒体の半径方
向に沿って移動するようになっている。On the other hand, the carriage part (S) has a carriage main body (7).
) and a pair of permanent magnets (30) for focus adjustment attached to this carriage body (7), and the approximate center of the carriage body (7) is a cylindrical part (31). A cylindrical portion (31) is interposed between the inner side of the lens holder (2) and the gap (8) between the outer housings (21) and (22), and the inner wall of the cylindrical portion (31) and the inner housing (21) It is in sliding surface contact with the outer wall. Further, the permanent magnet (30) for focus adjustment is disposed within the cylindrical portion of the bobbin (3) with its N pole facing the focus coil (4) side, and both ends thereof are connected to the carriage body. (7) is attached. Furthermore,
Bearings (32) to (32) are attached to the upper and lower ends of the carriage body (7), and these bearings (32) to (32) are connected to the rails (9) and (9).
) so that the carriage part (S) moves along the radial direction of the optical recording medium.
また、上記板ばね(1)は渦巻き状の金属材にて構成さ
れ、その内側をフォーカス調整可動部(p)のレンズ保
持体(2)に、その外側をキャリッジ部(S)のキャリ
ッジ本体(7)に固定して取付けられており、この板ば
ね(1>の作用により上記フォーカス調整可動部(p)
が上下方向へ移動できるようになっている。The leaf spring (1) is made of a spiral metal material, and its inner side is attached to the lens holder (2) of the focus adjustment movable part (p), and its outer side is attached to the carriage body (2) of the carriage section (S). 7), and by the action of this leaf spring (1), the focus adjustment movable part (p)
can be moved up and down.
このように構成された光学的記録再生装置においては、
装置本体側に設けられた図示外の光源からの集束光が反
射プリズム(図示せず)を介して対物レンズ(1)に入
射され、この対物レンズ(1)により上記集束光が光記
録媒体(図示せず)の収束面に収束されて情報の記録、
再生、並びに消去等がなされるものである。In the optical recording/reproducing device configured in this way,
Focused light from a light source (not shown) provided on the main body of the apparatus is incident on an objective lens (1) via a reflecting prism (not shown), and the objective lens (1) directs the focused light to an optical recording medium ( (not shown) to record information,
It is something that can be reproduced, erased, etc.
そして、この光学的記録再生装置においては図示外のリ
ード線を介して上記シークコイル(5)に通電すると、
ボビン(3)の外側のシーク」イル(5)にはシーク調
整用の永久磁石(10)による電磁力が作用し、第3図
の機械的等価図に示すようにフォーカス調整可動部(p
)にシーク駆動力(f、)が作用してシーク制御やトラ
ッキング制御がなされる一方、上記フォーカスコイル(
4)に通電するとこのフォーカスコイル(4)にはフォ
ーカス調整用の永久磁石(30)による電磁力が作用し
、第3図の機械的等価図に示すようにフォーカス調整可
動部(p)にフォーカス駆動力(f、)が作用してフォ
ーカス制御がなされるものである。In this optical recording/reproducing device, when the seek coil (5) is energized via a lead wire (not shown),
An electromagnetic force from a permanent magnet (10) for seek adjustment acts on the outer seek wheel (5) of the bobbin (3), and as shown in the mechanical equivalent diagram of FIG.
The seek driving force (f, ) acts on the focus coil () to perform seek control and tracking control, while the focus coil (
4), an electromagnetic force from a permanent magnet (30) for focus adjustment acts on this focus coil (4), and as shown in the mechanical equivalent diagram of Fig. 3, the focus adjustment movable part (p) is focused. Focus control is performed by applying a driving force (f,).
ここで、シーク制御やトラッキング制御時においては上
記ボビン(3)の内側、すなわちレンズ保持体(2)側
のシークコイル(5)にもフォーカス調整用の永久磁石
(30)による電磁力が作用し、かつ、この部位のシー
クボイル(5)に流れる電流の向きは上記外側のシーク
コイル(5)と反対のため、この部位のシークコイル(
5)には上記シーク駆動力(f )と反対向きの作用
力(−f)が発生し、また、この作用力(−f)は内力
のため、キャリッジ部(S)側にはこの作用力(−f)
に対する反力(f)が発生することとなる。Here, during seek control and tracking control, the electromagnetic force by the permanent magnet (30) for focus adjustment also acts on the seek coil (5) on the inside of the bobbin (3), that is, on the lens holder (2) side. , and since the direction of the current flowing through the seek coil (5) in this part is opposite to that of the outer seek coil (5), the seek coil (5) in this part
5), an acting force (-f) opposite to the seek driving force (f) is generated, and since this acting force (-f) is an internal force, this acting force is not applied to the carriage part (S) side. (-f)
A reaction force (f) will be generated.
そして、この光学的記録再生装置においては上記ボビン
(3)に巻回されたシークコイル(5)の巻数とシーク
調整用、並びにフォーカス調整用の永久磁石(10)
(30)の磁力強度を適宜調整して、f=f −M
/(m+M)、(但し、m ハフオーカス調整可動部の
質量、Mはキャリッジ部の質量を示している)となるよ
う予め設定しているため、上記作用力(−f)及び反力
(f)の作用によりシーク制御やトラッキング制御時に
おける共振現象を確実に防止することができる。In this optical recording/reproducing device, a permanent magnet (10) is used for adjusting the number of turns of the seek coil (5) wound around the bobbin (3) and for seek adjustment, as well as for focus adjustment.
(30) by adjusting the magnetic force strength appropriately, f=f −M
/(m+M), (where m is the mass of the huff focus adjustment movable part, M is the mass of the carriage part), so the above acting force (-f) and reaction force (f) By this action, it is possible to reliably prevent resonance phenomena during seek control and tracking control.
従って、上記シークコイル(5)に流す電流の周波数値
に拘らずフォーカス調整可動部(p)とキャリッジ部(
S)とを常に一体的に移動操作することが可能となるた
め、トラッキング制御を正確に行える利点を有している
。Therefore, regardless of the frequency value of the current flowing through the seek coil (5), the focus adjustment movable part (p) and the carriage part (
Since it is possible to always move and operate S) in an integrated manner, it has the advantage that tracking control can be performed accurately.
尚、第4図はフォーカス調整可動部(p)並びにキャリ
ッジ部(S)とが振動している場合におけるフォーカス
調整可動部(p)のシータ方向の振幅と周波数との関係
を示したグラフ図を、また、第5図はフォーカス調整可
動部(p)並びにキャリッジ部(S)とが振動している
場合におけるフォーカス調整可動部(p)の位相と上記
周波数との関係を示したグラフ図であり、これ等のグラ
フ図から共振現象が発生してないことが確認できる。FIG. 4 is a graph showing the relationship between the amplitude and frequency of the focus adjustment movable part (p) in the theta direction when the focus adjustment movable part (p) and the carriage part (S) are vibrating. 5 is a graph showing the relationship between the phase of the focus adjustment movable part (p) and the frequency when the focus adjustment movable part (p) and the carriage part (S) are vibrating. From these graphs, it can be confirmed that no resonance phenomenon occurs.
[発明の効果]
本発明は以上のように、フォーカス調整可動部のシーク
コイルに作用するシーク駆動力を利用せずにキャリッジ
部及びフォーカス調整可動部に内力発生手段を設け、こ
の内力の一方を構成する作用力又は他方の反力を利用し
て上記キャリッジ部を駆動するため、上記シークコイル
に流す電流の周波数値に拘らず共振の発生を確実に防止
することが可能となる。[Effects of the Invention] As described above, the present invention provides an internal force generating means in the carriage part and the focus adjustment movable part without using the seek driving force acting on the seek coil of the focus adjustment movable part, and generates one of the internal forces. Since the carriage section is driven using the acting force or the reaction force of the other component, it is possible to reliably prevent resonance from occurring regardless of the frequency value of the current flowing through the seek coil.
従って、フォーカス調整可動部とキャリッジ部とを常に
一体的に移動操作することが可能となるため、トラッキ
ング制御を正確に行える効果を有している。Therefore, it is possible to always move the focus adjustment movable section and the carriage section in an integrated manner, which has the effect of accurately performing tracking control.
第1図〜第5図は本発明の実施例を示しており、第1図
は実施例に係る光学的記録再生装置の一部切欠斜視図、
第2図は第1図の■−■百断面断面図3図はこの装置の
機械的等価図、第4図はこの装置におけるフォーカス調
整可動部(p)のシータ方向の振幅と周波数との関係を
示したグラフ図、第5図はフォーカス調整可動部(0)
のシータ方向の位相と周波数との関係を示したグラフ図
であり、第6図〜第11図は従来例を示しており、第6
図は光学的記録再生装置の構成概略図、第7図は駆動系
が組込まれた光学的記録再生装置の平面図、第8図は第
7図の■−■面断面図、第9図はこの装置の機械的等価
図、第10図はこの装置におけるフォーカス調整可動部
(p)のシータ方向の振幅と周波数との関係を示したグ
ラフ図、第11図はフォーカス調整可動部(p)のシー
タ方向の位相と周波数との関係を示したグラフ図である
。
[符号説明]
(1)・・・対物レンズ
(2)・・・レンズ保持体
(3)・・・ボビン
(4)・・・フォーカスコイル
(5)・・・シークコイル
(10)・・・シーク調整用の永久磁石(30)・・・
フォーカス調整用の永久磁石(p)・・・フォーカス調
整可動部
(S)・・・キャリッジ部
(1)・・・板ばね
特 許 出 願 人 富士七ロツクス株式会社代 理
人 弁理士 中 村 智 廣 (外2名
)第2図
第3図
f+
第4図
0KHz
周波数
第5図
第6図
第7図
第8図
第9図
1手
第11図1 to 5 show an embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view of an optical recording/reproducing apparatus according to the embodiment;
Figure 2 is a sectional view taken along the line 1 in Figure 1, Figure 3 is a mechanical equivalent diagram of this device, and Figure 4 is the relationship between the amplitude and frequency in the theta direction of the focus adjustment movable part (p) in this device. A graph showing the focus adjustment movable part (0) in Figure 5.
FIG. 6 is a graph showing the relationship between the phase in the theta direction and frequency, and FIGS. 6 to 11 show conventional examples;
The figure is a schematic diagram of the configuration of an optical recording and reproducing device, FIG. 7 is a plan view of the optical recording and reproducing device with a built-in drive system, FIG. 8 is a sectional view taken along the line ■-■ of FIG. A mechanical equivalent diagram of this device, FIG. 10 is a graph showing the relationship between the amplitude and frequency in the theta direction of the focus adjustment movable portion (p) in this device, and FIG. 11 is a graph of the focus adjustment movable portion (p) in this device. FIG. 2 is a graph diagram showing the relationship between the phase in the theta direction and frequency. [Description of symbols] (1)... Objective lens (2)... Lens holder (3)... Bobbin (4)... Focus coil (5)... Seek coil (10)... Permanent magnet for seek adjustment (30)...
Permanent magnet for focus adjustment (p)... Focus adjustment movable part (S)... Carriage part (1)... Leaf spring patent Applicant: Fujishichi Rox Co., Ltd. Representative: Satoshi Nakamura, patent attorney Hiro (2 others) Fig. 2 Fig. 3 f+ Fig. 4 0KHz Frequency Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 1 hand Fig. 11
Claims (2)
光記録媒体の収束面に収束させる対物レンズと、この対
物レンズを通電に伴う電磁力により光記録媒体面の略垂
直な方向に駆動するフォーカスコイルと、上記対物レン
ズを通電に伴う電磁力により光記録媒体の半径方向に駆
動するシークコイルと、上記フォーカスコイルとシーク
コイルとを支持するコイル支持部とでその主要部が構成
され、これ等対物レンズ、フォーカスコイル、シークコ
イル、及びコイル支持部とが一体的に固定されたフォー
カス調整可動部と、 このフォーカス調整可動部を搭載し光記録媒体の半径方
向へ移動可能に設けられたキャリッジ部と、 一端がフォーカス調整可動部に他端が上記キャリッジ部
に固定され、上記フォーカス調整可動部を光記録媒体面
の略垂直な方向へ移動可能な状態で支持する板ばね、 とを備える光学的記録再生装置において、 上記キャリッジ部及びフォーカス調整可動部間には、光
記録媒体の半径方向で互いに向きが反対の作用力と反力
をキャリッジ部とフォーカス調整可動部に発生させる内
力発生手段を設けたことを特徴とする光学的記録再生装
置。(1) An objective lens that is placed near the optical recording medium and converges the focused light from the light source onto the convergence surface of the optical recording medium, and the objective lens is arranged in a direction approximately perpendicular to the surface of the optical recording medium due to the electromagnetic force that occurs when electricity is applied to the objective lens. The main parts thereof include a focus coil to be driven, a seek coil to be driven in the radial direction of the optical recording medium by electromagnetic force caused by energization of the objective lens, and a coil support part to support the focus coil and the seek coil. , a focus adjustment movable part in which these objective lenses, focus coils, seek coils, and coil support parts are integrally fixed, and a focus adjustment movable part that is mounted so as to be movable in the radial direction of the optical recording medium. and a plate spring having one end fixed to the focus adjustment movable part and the other end fixed to the carriage part, supporting the focus adjustment movable part in a movable state in a direction substantially perpendicular to the surface of the optical recording medium. In the optical recording/reproducing device, an internal force is generated between the carriage part and the focus adjustment movable part to generate an action force and a reaction force in opposite directions in the radial direction of the optical recording medium on the carriage part and the focus adjustment movable part. An optical recording/reproducing device characterized by being provided with means.
周面にフォーカスコイルが巻回されたレンズ保持体と、
このレンズ保持体の外周面に取付けられシークコイルが
巻回されたボビンとで構成され、かつ、上記内力発生手
段が、上記ボビンの筒部内に設けられその両端が上記キ
ャリッジ部に取付けられると共に上記フォーカスコイル
側へ向う磁力線を形成するフォーカス調整用磁石と、上
記ボビンに巻回されたシークコイルとで構成されている
ことを特徴とする特許請求の範囲第1項記載の光学的記
録再生装置。(2) a lens holder in which the coil support part holds an objective lens and a focus coil is wound around the outer peripheral surface of the lens holder;
a bobbin attached to the outer circumferential surface of the lens holder and around which a seek coil is wound; and the internal force generating means is provided in a cylindrical portion of the bobbin, both ends of which are attached to the carriage portion. 2. The optical recording and reproducing apparatus according to claim 1, comprising a focus adjustment magnet that forms lines of magnetic force directed toward the focus coil, and a seek coil wound around the bobbin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9083889A JP2595712B2 (en) | 1989-04-12 | 1989-04-12 | Optical recording / reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9083889A JP2595712B2 (en) | 1989-04-12 | 1989-04-12 | Optical recording / reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02270138A true JPH02270138A (en) | 1990-11-05 |
JP2595712B2 JP2595712B2 (en) | 1997-04-02 |
Family
ID=14009725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9083889A Expired - Fee Related JP2595712B2 (en) | 1989-04-12 | 1989-04-12 | Optical recording / reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2595712B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5218587A (en) * | 1989-06-30 | 1993-06-08 | Fuji Xerox Co., Ltd. | Magnetic optical recording/reproducing apparatus |
-
1989
- 1989-04-12 JP JP9083889A patent/JP2595712B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5218587A (en) * | 1989-06-30 | 1993-06-08 | Fuji Xerox Co., Ltd. | Magnetic optical recording/reproducing apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2595712B2 (en) | 1997-04-02 |
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