JP2004326887A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device in which switching of an objective lens is realized in a compact and simple constitution, with an excellent following property of the objective lens for the optical disk, and the stable position compensation control of the objective lens can be performed. <P>SOLUTION: In an optical disk device, an optical pickup mechanism 3 is provided with a lens holder 12 holding two objective lenses 10A, 10B of which the umber of opening is different, a lens actuator 11 in which the lens holder 12 is supported with a plurality of wires W1-W4 and which drives minutely the lens holder 12 by electromagnetic forces, and lens switching mechanism 41, 42 moving the lens actuator 11 so that two objective lenses can be arranged respectively at outgoing positions, and while the lens actuator 11 supports the lens holder 12 so that two objective lenses 10A, 10B are arranged in the direction of rotation of the optical disk, compensates a tracking direction of the objective lenses 10A, 10B by driving the lens holder 12 in the direction of rotation centering almost an intermediate point of the objective lenses 10A and 10B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００３９】
従って、レンズホルダを並進運動させる構成では、２個の対物レンズ１０Ａ，１０Ｂを保持させることによりレンズホルダ１２の重量ｍが増した場合に、この重量ｍの増分だけ共振周波数ｆが低下することになる。フォーカス制御では余り高い周波数の運動を必要としていないため共振周波数の低下は余り問題にならないが、トラッキング制御には比較的高速な駆動を伴うので共振周波数ｆの低下は好ましくない。
【００４０】
そこで、この実施の形態のレンズアクチュエータ１１では、トラッキング制御にレンズホルダ１２を並進させるのではなく、レンズホルダ１２を回転運動させてトラッキング制御を行う構成とした。これにより、レンズホルダ１２の重量が運動に及ぼす影響を少なくでき、さらに変位量に対するバネの作用力も大きくなるため、この運動の共振周波数を高くすることが出来る。例えば、上記バネ振動の共振周波数ｆの式に当てはめた場合、重量ｍはレンズホルダ１２の実際の重量の１／３程度に、バネ定数ｋは並進のときよりも大きな値となり、並進運動の場合と比べて共振周波数ｆは高くなる。
【００４１】
従って、この実施の形態のレンズアクチュエータ１１によれば、１個のレンズホルダに２個の対物レンズを保持させてレンズホルダの重量が増した場合でも、安定的にトラッキング制御を行うことができる。
【００４２】
また、トラッキング制御でレンズホルダ１２が回転運動する際、ワイヤＷ１〜Ｗ４が斜めに伸びるように固定されているため、回転方向Ｒの駆動力に対してワイヤＷ１〜Ｗ４が適宜曲がり、レンズホルダ１２をスムースに回転方向Ｒに駆動することができる。
【００４３】
なお、本発明は、上記実施の形態に限られるものではなく、様々な変更が可能である。例えば、トラッキング制御でレンズホルダ１２のスムースな回転を得るためのワイヤ支持構造として、図３のように左右のワイヤＷ１〜Ｗ４がワイヤ基板２０に向って間隔が開くように斜めに固定するほか、例えば、各ワイヤＷ１〜Ｗ４がワイヤ基板２０に向って間隔を狭めるように斜めに固定される構造としても良く、このような構造でも同様の効果を得ることが出来る。また、直線状のワイヤＷ１〜Ｗ４ではなく、例えば中間で９０度に曲がったワイヤを用いてレンズホルダ１２を支持させることで、レンズホルダ１２の回転方向の駆動をスムースに行わせることも可能である。
【００４４】
また、実施の形態ではレンズアクチュエータとしてチルト角補正を行う３軸駆動タイプのものを示したが、本発明はチルト角補正を行わない２軸駆動タイプのレンズアクチュエータを備えた光ディスク装置に対しても同様に適用することも出来る。
【００４５】
その他、レンズアクチュエータをピックアップ機構内で移動させるレンズ切換機構、ピックアップ機構をディスクの半径方向に移動させる機構、レンズホルダを駆動するための磁石やコイルの配置構成、対物レンズの種類や記録再生を行うメディアの種類など、実施の形態で具体的に示した細部は適宜変更可能であることは云うまでもない。
【００４６】
【発明の効果】
以上説明したように、本発明に従うと、例えばレンズアクチュエータやピックアップ機構を２組設けたものに比較して、レンズアクチュエータやレンズホルダが１個で済むことから光ディスク装置全体の構成のコンパクト化、部品点数の削減ならびに製造コストの低減が図れるという効果がある。
【００４７】
また、ワイヤ支持型のレンズアクチュエータであるので光ディスクに対する追従性が良好であるとともに、２個の対物レンズをレンズホルダに保持させることでレンズホルダの重量が増しても、トラッキング制御の共振周波数を低く抑えることができ、安定した対物レンズの位置補正が出来るという効果がある。
【図面の簡単な説明】
【図１】本発明の実施の形態の光ディスク装置における光ピックアップの駆動系の構成を示す斜視図である。
【図２】図１のレンズアクチュエータを示す分離斜視図である。
【図３】図２のレンズアクチュエータの平面図である。
【図４】実施の形態に係るレンズアクチュエータにおいてトラッキング制御の動作を示す図である。
【図５】レンズホルダが光ディスクに面した状態を横から眺めた側面図である。
【符号の説明】
３ ピックアップ機構
３Ａ ベース部
３Ｂ 枠体
４ スクリューシャフト
１０Ａ，１０Ｂ 対物レンズ
１１ レンズアクチュエータ
１２ レンズホルダ
２０Ａ 半導体レーザ
２１ スプリッタ
３１，３２ 磁石
１５Ａ，１５Ｂ 磁石
４１ 軸受け
４２ スライドシャフト
Ｗ１〜Ｗ４ ワイヤ
Ｆ１，Ｔｒ１１，Ｔｒ１２，Ｔｒ２１，Ｔｒ２２ コイル
Ｔｉ１，Ｔｉ２ コイル[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk device that records or reproduces information on an optical disk, and further relates to an optical disk device that can handle a plurality of types of optical disks.
[0002]
[Prior art]
At present, multiple types of media have been put into practical use, such as data rewritable CDs (compact discs) and DVDs (digital versatile discs), as well as optical discs that use blue-violet lasers to enable large-capacity recording and playback. Have been.
[0003]
When recording or reproducing information on or from these media, it is necessary to use a laser beam having a wavelength corresponding to each media. In addition, an objective lens having a numerical aperture of “NA 0.6 to 0.65” for a CD or DVD. In the case of an optical disk for a blue-violet laser, it is necessary to use an objective lens corresponding to each medium, such as an objective lens having a numerical aperture of “NA 0.85 to 1.0”.
[0004]
Therefore, in order to make a single optical disk device correspond to a plurality of types of media, a plurality of semiconductor lasers having different output wavelengths and a plurality of objective lenses having different numerical apertures are mounted in the device, and according to the type of media. It is necessary to switch and use them.
[0005]
As a conventional technique that can support a plurality of media by switching and using a plurality of objective lenses, there are techniques disclosed in Patent Literature 1 and Patent Literature 2, for example. In these, a plurality of objective lenses are provided in one lens holder, and the objective lens to be used is switched by translating or rotating the lens holder.
[0006]
[Patent Document 1]
JP-A-12-20572 [Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 10-198993
[Problems to be solved by the invention]
Incidentally, in the optical disk device, it is necessary to perform position correction by slightly displacing the objective lens in the focus direction of light and in the radial direction (track direction) of the disk orthogonal to the data sequence on the disk. Therefore, a conventional optical disk device is provided with a lens actuator that supports the lens holder with a plurality of wires or supports the lens holder so as to be slidable and minutely drives the lens holder using electromagnetic force. The position correction is performed using the lens actuator. In such a lens actuator, the configuration for supporting the lens holder is considered to be superior in terms of the followability of the objective lens if it has a wire support structure.
[0008]
However, in a lens actuator of a type that translates a lens holder with a wire supporting structure, the resonance frequency of the lens holder decreases as the weight of the lens holder increases. Therefore, when a configuration in which two objective lenses are held by one lens holder for switching is applied, a problem arises in that the weight of the lens holder increases as the number of objective lenses increases, and the resonance frequency of the lens actuator decreases. Would.
[0009]
Such a decrease in the resonance frequency is not a problem because the control operation in the focus direction does not require a control operation in a very high frequency range, but the control operation in the high frequency range is also required in the correction control in the track direction. Because of the requirement, the tracking control has a problem that its stability is deteriorated.
[0010]
An object of the present invention is to realize switching of objective lenses with a compact configuration by holding two objective lenses in one lens holder, and furthermore, the objective lens has good follow-up properties with respect to an optical disk. An object of the present invention is to provide an optical disk device capable of performing stable position correction control.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an optical system for guiding a laser beam to a predetermined path, an optical pickup mechanism provided with an objective lens for condensing the laser beam on a recording surface of the optical disc, and an optical disc mechanism for the optical pickup mechanism. In the optical disc apparatus provided with a track moving means for moving in the radial direction, the optical pickup mechanism includes two objective lenses having different numerical apertures, and one lens holder for holding the two objective lenses. A lens driving unit that supports the lens holder with a plurality of wires and can correct the position of the lens holder in a predetermined direction by electromagnetic force, and the two objective lenses can be arranged at the laser beam emission position. A lens switching mechanism for moving the lens driving means is provided, and the lens switching mechanism is provided at a laser beam emission position. The lens driving means can be moved in the rotation direction of the optical disk, the two objective lenses are arranged side by side in the rotation direction of the optical disk, and the lens driving means The objective lens is driven in a rotational direction about the center point of the objective lens to correct the tracking direction of the objective lens.
[0012]
According to such a means, since two objective lenses are held in one lens holder, the entire optical pickup mechanism including the objective lens and the lens driving means can be configured compactly and simply. Thus, for example, the number of parts and the cost can be reduced as compared with the case where two optical pickup mechanisms are provided for each objective lens.
[0013]
Further, since the lens driving means has a configuration in which the lens holder is supported by wires, the objective lens has good followability with respect to the optical disk, and further, the position correction in the tracking direction is performed by driving the lens holder in the rotation direction. As described in the embodiment, the resonance frequency can be increased as compared with the case where the lens holder is driven in translation.
[0014]
Therefore, even if the lens holder holds two objective lenses and the weight of the lens holder increases, the resonance frequency accompanying the position correction does not overlap the frequency range necessary for the position correction in the tracking direction. Can be increased, whereby stable tracking control can be performed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of a drive system of an optical pickup in an optical disk device according to an embodiment of the present invention.
The optical disk device of this embodiment includes, for example, three semiconductor lasers having different output wavelengths (other semiconductor lasers 20A are omitted in FIG. 1) and two objective lenses 10A having different numerical apertures. 10B is mounted, and by switching these semiconductor lasers and objective lenses, it can be used not only for rewritable CDs and DVDs but also for optical disks for blue-violet lasers. It is configured to be reproducible.
[0016]
This optical disk device includes a spindle 2 that fixes and rotates a central portion of an optical disk, a pickup mechanism 3 having an optical system for guiding a laser beam along a predetermined path for recording and reproducing information, and a Screw shafts 4 and 4 serving as track moving means for moving the pickup mechanism 3 in the radial direction of the optical disk in accordance with the recording / reproducing position, a drive motor (not shown), a tray mechanism (not shown) for taking the optical disk in and out of the apparatus, A control circuit (not shown) for performing control is provided.
[0017]
The optical pickup mechanism 3 includes a frame 3B on which an optical system excluding the objective lens is mounted, a lens actuator 11 holding the objective lenses 10A and 10B, and being fixed in a state where the arrangement can be switched on the frame 3B. Consists of
[0018]
The optical system mounted on the frame 3B includes a semiconductor laser 20A, a collimator lens, a condenser lens, a beam splitter 21, a laser diode, and the like. Although these elements are not described in detail, they output laser light to a pickup position where one of the objective lenses 10A and 10B is disposed, guide the laser light, extract reflected light of an optical disk to detect intensity, and perform laser irradiation. It is useful to feed back part of the output light for feedback control to keep the light output level constant, or to extract part of the incident light or reflected light to correct the position of the objective lenses 10A and 10B. Used.
[0019]
The configuration (lens switching mechanism) for switching the arrangement of the lens actuator 11 is not particularly limited. For example, as shown in FIG. 1, the slide shafts 42 and 42 are provided on the frame 3B, while the base of the lens actuator 11 is provided. The bearings 41, 41,... Are provided in the portion 3A, and the bearings 41, 41,. In addition, various configurations can be applied, such as a configuration in which the arrangement of the lens actuator 11 is switched using a cradle type movement mechanism.
[0020]
The driving force for switching the arrangement of the lens actuator 11 is not shown, but a driving device such as a motor or a solenoid actuator is provided on the frame 3 </ b> B and transmitted from these driving devices. A driving device may be provided at the home position, and when the pickup mechanism 3 moves to the home position, the driving device and the moving mechanism of the lens actuator 11 may be connected to transmit power. I can do it.
[0021]
FIG. 2 is an exploded perspective view showing the configuration of the lens actuator 11, and FIG. 3 is a plan view of the lens actuator 11.
The lens actuator 11 of the present embodiment causes the objective lens to be slightly displaced in three axial directions: a focus direction F, a tracking direction Tr perpendicular to the rotation direction of the optical disk, and a tilt angle direction Ti corresponding to a tilt in the radial direction of the optical disk. Is made possible.
[0022]
The lens actuator 11 includes a lens holder 12 that holds two objective lenses 10A and 10B, four wires W1 to W4 that support the lens holder 12, and a lens holder 12 in a range where the wires W1 to W4 pass. Gel boxes 22 and 22 for loading a buffer gel (not shown) for attenuating the resonance of the lens, and coils F1, Tr11, Tr12, and C1, provided on the lens holder 12 side for driving the lens holder 12 by electromagnetic force. It includes magnets 15A and 15B attached to the bottom surfaces of Tr21 and Tr22 (FIG. 3) and the lens holder 12, and magnets 31 and 32 and coils Ti1 and Ti2 provided on the base 3A side. The base portion 3A is provided with a wire substrate 20 for fixing the wires W1 to W4, a magnet holder 30 for fixing a magnet, and the like.
[0023]
As shown in FIG. 3, the two objective lenses 10A and 10B are held at positions displaced in directions perpendicular to the tracking direction Tr with the center point on the upper surface of the lens holder 12 interposed therebetween. Although not particularly limited, it is preferable that the lens holders 12 be held at positions displaced at substantially equal intervals from a central point on the upper surface.
[0024]
The wires W <b> 1 to W <b> 4 are formed by fitting the printed circuit board 13 a to which the left wires W <b> 1 and W <b> 2 are connected and the printed circuit board 13 b to which the right wires W <b> 3 and W <b> 4 are connected in the concave portion of the lens holder 12. , And the wires W1 to W4 and the wiring in the lens holder 12 are electrically connected.
[0025]
The mounting position of the wires W1 to W4 is determined by a line connecting the root position S1 of the left wires W1 and W2 and the root position S2 of the right wires W3 and W4 to the center position of the lens holder 12 in a plan view. It is made to come to the position which almost overlaps.
[0026]
Further, the wires W1 to W4 extend obliquely so that the left wires W1 and W2 and the right wires W3 and W4 are spaced apart left and right toward the wire board 20. Soldered.
[0027]
The coils Tr11, Tr12, Tr21, Tr22 (FIG. 3) are used for tracking drive, and are each composed of a thin rectangular flat coil in which a conductive wire is wound along each side of a square. These coils are mounted on the two opposite side surfaces 12A and 12B of the lens holder 12 so as to be arranged two by two in the horizontal direction. These coils Tr11, Tr12, Tr21, Tr22 are connected in series between the wires W1, W3, and the two coils Tr11 and Tr12 (or Tr21 and Tr22) provided on the same surface have opposite directions (for example, If the coil Tr11 is clockwise, the current flows in the coil Tr12 counterclockwise), and the two opposing coils Tr11 and Tr21 (or Tr12 and Tr22) are connected so that the current flows in the same rotational direction when viewed from the same direction. ing.
[0028]
The coil F1 is used for focus driving, and is wound around a side surface of the lens holder 12. This coil is electrically connected between the wires W2 and W4.
[0029]
The magnets 15A and 15B are used for tilt angle driving, and are attached to the bottom surface of the lens holder 12, respectively. These two magnets 15A and 15B are mounted at positions displaced at equal intervals in the tracking direction Tr with the center of the bottom surface of the lens holder interposed therebetween.
[0030]
The magnets 31 and 32 installed on the magnet holder 30 are arranged so as to face the two side surfaces 12A and 12B of the lens holder 12 where the coils Tr11 to Tr22 are provided, and both have the same polarity (for example, S pole). It is turned to the inside. The width of these magnets 31, 32 is formed to be narrower than the sum of the widths of the two coils, and is about half that of each of the two coils Tr11, Tr12 (or Tr21, Tr22) opposed to each other. Are arranged so as to overlap the range.
[0031]
The coils Ti1 and Ti2 on the base section 3A side are provided at positions facing the magnets 15A and 15B of the lens holder 12, and are connected in series, for example, so that the same current flows.
[0032]
According to the lens actuator 11 having such a configuration, first, when a current flows through the coil F1 wound around the side surface of the lens holder 12, the coil F1 and the magnets 31 and 32 act to actuate the lens holder 12. Is driven in the focus direction F. By reversing the direction of the current, driving is performed in the opposite direction.
[0033]
In addition, when current flows through the coils Ti1 and Ti2 on the base portion 3A side, these coils and the magnets 15A and 15B act to drive the lens holder 12 in the tilt angle direction. That is, when a current in a predetermined direction is caused to flow between the wires W2 and W4, a repulsive force acts on the one coil Ti1 and the magnet 15A, and an attractive force acts on the other coil Ti2 and the magnet 15B, so that the lens holder 12 moves in the Ti direction (FIG. 2). The lens holder 12 is tilted in the -Ti direction by applying a current in the reverse direction and the reverse direction to exert a reverse force.
[0034]
FIG. 4 is a diagram illustrating the operation of tracking control in the lens actuator 11.
Driving in the tracking direction is performed by passing a current through the coils Tr11, Tr12, Tr21, Tr22 via the wires W1, W3. That is, the coils Tr11, Tr12, Tr21, Tr22 and the magnets 31 and 32 act on this current, and the lens holder 12 is driven in the rotation direction R (FIG. 4), whereby the respective objective lenses 10A and 10B track. Displaced in directions Tr and -Tr. Specifically, when a current in a predetermined direction flows through the wires W1 and W3, a leftward driving force is applied to the coils Tr11 and Tr12 provided on one side surface 12A, and the coil Tr21 provided on the other side surface 12B. , Tr22, a rightward driving force is generated, and the lens holder 12 is driven in the rotation direction R about the center point thereof. Thus, the inner objective lens 10B is displaced in the tracking direction Tr, and the outer objective lens 10A is displaced in the opposite tracking direction -Tr. The reverse displacement is obtained by passing a current in the reverse direction, and the tracking control of each of the objective lenses 10A and 10B is performed by these.
[0035]
FIG. 5 is a side view showing a state where the lens holder 12 faces the optical disc D.
The objective lenses 10A and 10B have, for example, numerical apertures of “NA 0.6 to 0.65” and “NA 0.85 to 1.0”, and a working distance (Working Distance) representing the distance from the lens upper surface to the focal position. 1.5 mm "and" 0.3 mm ".
As shown in FIG. 5, these objective lenses 10A and 10B are held in a lens holder 12 with different heights according to the working distance.
[0036]
As described above, according to the optical disk device of the present embodiment, by moving the lens actuator 11 on the frame, the objective lens 10A or 10B is arranged in the emission hole through which the laser light is guided, and the two objective The lenses 10A and 10B can be switched and used. According to such a configuration, compared to a configuration in which two sets of lens actuators and pickup mechanisms are provided, only one lens actuator and one lens holder are required, so that the configuration can be made compact, and the number of parts and the manufacturing cost can be reduced. I can do it.
[0037]
Further, since the wire actuator is used as the lens actuator 11, the followability of the objective lenses 10A and 10B to the optical disk D is good. By the way, when the lens holder 12 is translated in the wire support type, the lens holder 12 performs the same movement as the spring vibration, and its resonance frequency f is proportional to the reciprocal of the square root of the weight m as in the following equation (1). I do.
[0038]
(Equation 1)

[0039]
Accordingly, in the configuration in which the lens holder is translated, when the weight m of the lens holder 12 increases by holding the two objective lenses 10A and 10B, the resonance frequency f decreases by the increment of the weight m. Become. The focus control does not require a movement of a very high frequency, so that the reduction of the resonance frequency does not cause much problem. However, the tracking control involves relatively high-speed driving, so that the reduction of the resonance frequency f is not preferable.
[0040]
Therefore, in the lens actuator 11 of the present embodiment, the tracking control is not performed by translating the lens holder 12 but by rotating the lens holder 12 to perform the tracking control. As a result, the influence of the weight of the lens holder 12 on the movement can be reduced, and the acting force of the spring on the amount of displacement increases, so that the resonance frequency of this movement can be increased. For example, when applied to the above equation of the resonance frequency f of the spring vibration, the weight m is about 1/3 of the actual weight of the lens holder 12, and the spring constant k is a value larger than that in the case of translation. , The resonance frequency f becomes higher.
[0041]
Therefore, according to the lens actuator 11 of this embodiment, tracking control can be stably performed even when the weight of the lens holder is increased by holding two objective lenses in one lens holder.
[0042]
Further, when the lens holder 12 rotates in tracking control, the wires W1 to W4 are fixed so as to extend obliquely, so that the wires W1 to W4 are appropriately bent with respect to the driving force in the rotation direction R, and the lens holder 12 is rotated. Can be smoothly driven in the rotation direction R.
[0043]
It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, as a wire support structure for obtaining a smooth rotation of the lens holder 12 by tracking control, besides fixing diagonally so that the left and right wires W1 to W4 are open toward the wire substrate 20 as shown in FIG. For example, a structure may be employed in which the wires W1 to W4 are fixed obliquely so as to narrow the interval toward the wire substrate 20, and the same effect can be obtained with such a structure. In addition, by supporting the lens holder 12 using, for example, a wire bent at 90 degrees in the middle instead of the straight wires W1 to W4, it is possible to smoothly drive the lens holder 12 in the rotation direction. is there.
[0044]
Further, in the embodiments, the three-axis drive type that performs tilt angle correction is shown as the lens actuator. However, the present invention is also applicable to an optical disc apparatus including a two-axis drive type lens actuator that does not perform tilt angle correction. The same can be applied.
[0045]
In addition, a lens switching mechanism for moving the lens actuator in the pickup mechanism, a mechanism for moving the pickup mechanism in the radial direction of the disc, an arrangement of magnets and coils for driving the lens holder, and the type and recording / reproduction of the objective lens. It goes without saying that details specifically shown in the embodiment, such as the type of media, can be changed as appropriate.
[0046]
【The invention's effect】
As described above, according to the present invention, only one lens actuator and one lens holder are required as compared with the case where two sets of lens actuators and pickup mechanisms are provided. This has the effect of reducing the number of points and the manufacturing cost.
[0047]
In addition, since the lens actuator is a wire-supported lens actuator, it has good follow-up properties with respect to an optical disk. Also, by holding two objective lenses in a lens holder, the resonance frequency of tracking control can be reduced even if the weight of the lens holder increases. Thus, there is an effect that the position of the objective lens can be stably corrected.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a drive system of an optical pickup in an optical disc device according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the lens actuator of FIG. 1;
FIG. 3 is a plan view of the lens actuator of FIG. 2;
FIG. 4 is a diagram showing an operation of tracking control in the lens actuator according to the embodiment.
FIG. 5 is a side view of a state where the lens holder faces the optical disk when viewed from the side.
[Explanation of symbols]
3 Pickup Mechanism 3A Base 3B Frame 4 Screw Shaft 10A, 10B Objective Lens 11 Lens Actuator 12 Lens Holder 20A Semiconductor Laser 21 Splitter 31, 32 Magnet 15A, 15B Magnet 41 Bearing 42 Slide Shaft W1-W4 Wire F1, Tr11, Tr12 , Tr21, Tr22 Coil Ti1, Ti2 coil

Claims (4)

An optical pickup mechanism including an optical system for guiding the laser light to a predetermined path and an objective lens for condensing the laser light on the recording surface of the optical disc; and track moving means for moving the optical pickup mechanism in a radial direction of the optical disc. In the optical disk device provided,
The optical pickup mechanism includes two objective lenses having different numerical apertures, one lens holder for holding the two objective lenses, and supporting the lens holder with a plurality of wires and applying the lens by electromagnetic force. A lens driving unit capable of correcting the position of the holder in a predetermined direction, and a lens switching mechanism for moving the lens driving unit so that the two objective lenses can be respectively arranged at the laser beam emission positions.
The lens switching mechanism is configured to be able to move the lens driving means in the rotation direction of the optical disc at the laser light emission position,
The two objective lenses are arranged side by side in the direction of rotation of the optical disk, and the lens driving means drives the lens holder in a direction of rotation about the center point between the two objective lenses. An optical disc device, wherein the optical disc device is configured to correct the tracking direction of the objective lens. An optical pickup mechanism including an optical system for guiding the laser light to a predetermined path and an objective lens for condensing the laser light on the recording surface of the optical disc; and track moving means for moving the optical pickup mechanism in a radial direction of the optical disc. In the optical disk device provided,
The optical pickup mechanism includes two objective lenses having different numerical apertures, one lens holder for holding the two objective lenses together, and supporting the lens holder with a plurality of wires and applying electromagnetic force to the lens holder. Lens driving means capable of correcting the position of the lens holder in a predetermined direction is provided;
An optical disk device, wherein the two objective lenses are arranged side by side in a rotation direction of the optical disk. The lens driving means is configured to correct the tracking direction of the objective lens by driving the lens holder in a rotation direction about a center point between the two objective lenses. 3. The optical disk device according to claim 2, wherein: A lens switching mechanism capable of moving the lens driving means so as to dispose the two objective lenses at the emission positions of the laser light, respectively;
4. The optical disk apparatus according to claim 2, wherein the lens switching mechanism is configured to move the lens driving unit in a rotation direction of the optical disk at a position where the laser light is emitted.

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