JP2861894B2 - Objective lens drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving device used for an optical reproducing / recording device for an optical disk, and more particularly, to effectively attenuate vibration of a lens holder and a leaf spring supporting the lens holder when the lens is driven. The present invention relates to an objective lens driving device that can absorb light.

[0002]

2. Description of the Related Art In recent years, an optical reproduction / recording system which irradiates a signal recording surface of an optical disk or a magneto-optical disk with a light beam to read information signals recorded on these disks or write predetermined information signals. The device is widely used. Such an optical reproducing / recording apparatus is provided with an objective lens driving device that is displaced and driven in two axial directions of a focus direction and a tracking direction in order to always accurately converge and irradiate a light beam on a track on a disk. .

Hitherto, as this type of objective lens driving device, there is one as shown in FIGS. FIG.
FIG. 9 is an overall perspective view showing a conventional objective lens driving device, and FIG. 9 is an enlarged plan view showing a mounting portion of a track leaf spring in the conventional objective lens driving device shown in FIG.

As shown in these figures, a conventional objective lens driving device includes a support base 10, a lens holder 20,
It has a configuration including a fixed support portion 30 and a movable support portion 40. A pair of yokes 11 (11a, 11b) are provided on one side of the support base 10, and a magnet 12 is mounted on one of the yokes 11a. The yoke 11 and the magnet 12 form a magnetic circuit. A fixing portion 13 for fixing the fixed support portion 30 is provided upright on the other side of the support base 10.

The lens holder 20 has the objective lens 1 mounted on one side and the support base 1 on the other side.
The pair of zero yokes 11 and the magnets 12 can be housed in a penetrated state. Reference numeral 21 denotes a focus coil, which is wound around the yoke 11a and the magnet 12, and is fixed to a housing portion on the other side of the lens holder 20. Reference numeral 22 denotes a track coil, which is fixed to the side of the focus coil 21 and
Is fixed inside.

[0006] The fixed support portion 30 is integrally fixed to the support base 10 by fitting into a fixed portion 13 erected on the support base 10 on the side opposite to the lens holder 20. On the opposite side of the fixed support 30 from the lens holder 20, a movable support 40 is disposed to face.
A track leaf spring 60 is erected along the height direction between the opposing surfaces of the fixed support 30 and the movable support 40, and the movable leaf 4
0 is the tracking plane of the objective lens 1 with respect to the fixed support portion 30, that is, XY around the Z axis shown in FIG.
It can be turned on a plane.

The focus leaf spring has four metal leaf springs 5.
0 (50a, 50b, 50c, 50d). The focus leaf springs 50a, 50b, 50c, 5
0d, one end of each leaf spring is fixed to four mounting portions 20a, 20b, 20c, 20d of the lens holder 20, and the other end is connected to four mounting portions 40 of the movable support portion 40.
a, 40b, 40c, and 40d. This allows the lens holder 20 to move the focus leaf spring 50
And is connected to and held by the movable support section 40 via the.

When the metal plate springs 50a, 50b, 50c, and 50d are bent, the lens holder 20 is provided with the mounting portions 40a to 40d of the movable support portion 40 as fulcrums, and the focus direction of the objective lens 1 is adjusted. That is, it can rotate in the Z-axis direction shown in FIG.

Here, the fixed support 30 and the movable support 40
The mounting portion of the track leaf spring 60 installed between the two will be described with reference to FIG. As shown in FIG. 9, grooves 31 and 41 for mounting track leaf springs 60 are provided on the opposing surfaces of the fixed support portion 30 and the movable support portion 40 in the height direction, that is, of the objective lens 1. It is formed along the focus direction (Z-axis direction shown in FIG. 8). And tiger
The plate leaf spring 60 has both ends in the longitudinal direction,
1. The two supporting portions 3 are arranged at substantially the center of the first support member 3 by an adhesive 70 having a large tensile strength and a high hardness.
It is firmly fixed at 0,40.

According to the conventional objective lens driving device having such a configuration, the magnetic circuit constituted by the yoke 11 and the magnet 12 is located so as to sandwich the focus coil 21 and the track coil 22. When a current is applied to each of the coils 21 and 22, the focus leaf spring 50 and the track leaf spring 60 are bent by the electromagnetic action between the magnetic circuit and the coil, and the lens holder 20 is moved in the focus direction (the Z-axis direction shown in FIG. 8). And in the track direction (the X-axis direction shown in FIG. 8). As a result, the objective lens 1 is driven and displaced based on the output signal of a photodetector (not shown), and focus servo and tracking servo are performed.

When the optical disc is rotated by such a focus servo of the objective lens, even if a so-called surface wobble occurs, the light beam projected on the signal recording surface is always accurately positioned on the signal recording surface. It will be focused. When the focus servo is operated, the objective lens is driven and displaced so that the distance between the objective lens and the optical disk is always kept at a predetermined value. Further, when the optical disc is rotated by the tracking servo of the objective lens, even if so-called misalignment occurs, the beam spot where the light beam is focused accurately traces the recording track formed on the signal recording surface. It has become.

[0012]

However, in such a conventional objective lens driving device, a secondary resonance of a leaf spring or the like generated when the objective lens is driven is caused by a leaf spring, an adhesive, a movable support, or the like. There is a problem that the light is transmitted to the objective lens. Secondary resonance of a leaf spring or the like causes unnecessary vibration of the objective lens, and as a result, there has been a problem that the writing and reading operations of the disk are not stable and high-speed operation becomes difficult. Such adverse effects of the secondary resonance have a problem, in particular, in insufficient damping of vibration at the resonance level in the tracking direction.

That is, in the conventional objective lens driving device, with respect to the focus direction, each end of the four focus leaf springs 50 is connected to the lens holder 20 and the movable support 30.
Therefore, it is possible to use a flexible and elastic adhesive having a high damping property to attenuate and absorb resonance of the leaf spring and the lens holder at the fixed portion at each other end of the focus leaf spring. Was. Thereby, the secondary resonance generated in the focus leaf spring and the lens holder when the objective lens follows the focus direction can be suppressed to a low level even at the resonance level of the resonance frequency on the low frequency side (hereinafter referred to as “f0”). Was.

However, in the track direction, since only one track leaf spring is mounted on the fixed support portion and the movable support portion, it is necessary to firmly fix the leaf spring. Therefore, an adhesive having high elasticity as in the focus direction cannot be used, and it has been difficult to effectively dampen the vibration of the drive system of the lens holder and the secondary resonance of the track leaf spring itself. The fact that the resonance level of f0 is high means that the convergence of the lens vibration due to the acceleration applied to the lens driving unit of the objective lens driving device at the time of access in the optical disk device is slow, which has been a major problem of deterioration of the access time. .

In order to solve the problem of damping at the resonance level in the tracking direction, Japanese Patent Laid-Open No. 4-229422 proposes an objective lens driving device as shown in FIGS. . This objective lens driving device adheres two adhesive sheets 61 made of an elastic material to both surfaces of a track leaf spring 60, and
Sheet holder plates 62 (62a, 62b, 62c,
62d), the track leaf spring 6
0 is bonded to each end of both sides.

According to such an objective lens driving device,
A track leaf spring 60 is attached to each groove of the fixed support portion 30 and the movable support portion 40 of the objective lens driving device by an adhesive 70 having high hardness.
Even when firmly held by the above, the vibration can be attenuated by the elastic layer formed by the adhesive sheet 61 and the holder plate 62, and the resonance in the tracking direction can be suppressed to be low.

However, even in the objective lens driving device provided with such an elastic layer, the adhesive sheet made of an elastic material is adhered to the surface of the track leaf spring. It was the same size as that, and could not be larger. Also,
As with the conventional objective lens driving device, it was necessary to ensure a certain rigidity for the mounting portion of the track leaf spring, so that the adhesive sheet could not be made too thick. Therefore, in order to function as an elastic layer for effectively attenuating and absorbing the resonance of the leaf spring and the lens holder, there is a problem that the length and the thickness are insufficient.

On the other hand, when an adhesive sheet or a holder plate is adhered to the track leaf spring, the amount of deformation of the track leaf spring itself with respect to the low-range lens movable amount is reduced, and this is insufficient for reducing the resonance level particularly at f0. There was also the problem that

Further, in this objective lens driving device, since the track leaf spring is covered with the adhesive sheet made of the elastic material, for example, the fixed support portion and the movable support portion are formed of resin and formed integrally with the track leaf spring. Cannot be performed, resulting in disadvantages in terms of manufacturing or cost.

The present invention has been proposed to solve such problems of the prior art, and effectively attenuates and absorbs vibrations of a lens holder and a leaf spring supporting the lens holder when the lens is driven. In particular, it is an object of the present invention to provide an objective lens driving device capable of reducing the resonance level of the natural frequency f0 in the track direction.

[0021]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The objective lens driving device of the present invention includes a support base provided with a magnetic circuit, a tracking coil and a focus coil, a lens holder for holding the objective lens, and the support base rotated in the tracking direction via a track leaf spring. A movable supporting portion attached in a possible state, and a focus leaf spring that connects the lens holder and the movable supporting portion to be rotatable in a focusing direction,
In an objective lens driving device in which the lens holder is driven in a tracking direction and a focusing direction by an electromagnetic action of the magnetic circuit and each of the coils, a damping unit that swingably connects the movable support unit to the support base. There is a configuration provided.

According to a first aspect of the present invention, in the objective lens driving device, the damping means includes a damping plate having one side fixed to the support base and the other side attached to the movable supporting portion; A groove is formed in the movable support portion, the side of which is movably engaged, and a damping material is filled in the groove to hold the other side of the damping plate in a swingable manner.

According to a second aspect of the present invention, in the objective lens driving device, the damping means includes a damping plate having one side fixed to the movable support portion and the other side attached to the support base; A groove is formed in the support base, the side of which is movably engaged, and a damping material is filled in the groove to hold the other side of the damping plate in a swingable manner.

Further, in the objective lens driving device according to the third aspect , the damping means is formed on the projection protruded from the movable support portion and on the support base with which the projection engages in a free state. It is configured to include a hole, and a damping material filled in the hole to swingably hold the protrusion of the movable support portion.

According to the objective lens driving device of the present invention having such a configuration, since the movable support portion and the support base are swingably connected by the damping means, the movable support portion is generated on the movable support portion and the like when the lens is driven. In response to the vibration, the damping material exerts a vibration damping action in the compression and tension directions and the shear direction.

As a result, it is possible to effectively attenuate and absorb the secondary resonance generated in the focus leaf spring and the track leaf spring and unnecessary resonance in the focus direction of the lens holder and the like transmitted from the track leaf spring. In particular, the resonance at f0 in the track direction, which has been a particular problem, can be effectively damped and absorbed.

Further, by providing the damping means, the track leaf spring itself can be formed as a single metal leaf spring, so that it is not necessary to provide a vibration damping means such as an elastic layer on the track leaf spring. Accordingly, the track leaf spring can be formed integrally with the movable support portion and the support base, and thus the manufacturing operation can be facilitated, the efficiency can be increased, the cost can be reduced, and the like.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the objective lens driving device according to the present invention will be described below with reference to the drawings. The objective lens driving device of the present invention is characterized in that the objective lens driving device further includes a damping means for swingably connecting the movable support portion to at least one of the fixed support portion and the support base in the conventional objective lens drive device. The other points are the same as those of the conventional objective lens driving device. Therefore, the same parts as those of the conventional objective lens driving device shown in FIGS. 8 and 9 described above are denoted by the same reference numerals in the drawings, and detailed description may be omitted.

[First Embodiment] First, a first embodiment of the objective lens driving device of the present invention will be described. FIG.
1 is an overall perspective view showing a first embodiment of an objective lens driving device of the present invention. FIG. 2 is an enlarged plan view showing a movable supporting portion and a damping means in the objective lens driving device shown in FIG. 1, and FIG.
It is a line sectional view.

As shown in these figures, the objective lens driving device of the present embodiment includes a support base 10, a lens holder 20, a fixed support portion 30, and a movable support portion 40, similarly to the above-described conventional objective lens drive device. The fixed support portion 30 and the movable support portion 40 are connected by damping means 80.

A pair of yokes 11 (11a, 11b) are provided on one side of the support base 10, and a magnet 12 is mounted on one of the yokes 11a to form a magnetic circuit. Also, on the other side of the support base 10,
A fixing portion 13 for fixing the fixed support portion 30 is provided upright.

The lens holder 20 has the objective lens 1 mounted on one side and the support base 1 on the other side.
A pair of zero yokes 11 and a magnet 12 penetrate and are housed. The focus coil 21
The lens coil 20 is fixed to a storage portion on the other side of the lens holder 20 while being wound around the yoke 11a and the magnet 12, and a track coil 22 is fixed to a side portion.

The fixed support portion 30 is integrally fixed to the support base 10 by being fitted to the fixed portion 13 on the support base 10. The movable support portions 40 are disposed to face each other. A track leaf spring 60 is erected along the height direction between the opposing surfaces of the fixed support portion 30 and the movable support portion 40. The flexure of the track leaf spring 60 causes the movable support portion 40 to be fixedly supported. The unit 30 can be rotated on a tracking plane of the objective lens 1, that is, an XY plane centered on the Z axis shown in FIG.

The focus leaf spring 50 includes four metal leaf springs 50a, 50b, 50c, and 50d. Each leaf spring has one end having four mounting portions 20 on the lens holder 20.
a, 20b, 20c, and 20d, and the other ends of the four mounting portions 40a, 40b,
It is fixed to 40c, 40d. Thus, the lens holder 20 is connected to and held by the movable support section 40 via the focus leaf spring 50.

When the metal plate springs 50a, 50b, 50c, and 50d bend, the lens holder 20 is provided with the mounting portions 40a to 40d of the movable support portion 40 as fulcrums, and the focusing direction of the objective lens 1 is adjusted. That is, it can rotate in the Z-axis direction shown in FIG.

Here, the fixed support portion 30 and the movable support portion 40
The mounting portion of the track leaf spring 60 of the present embodiment, which is installed between the two, will be described with reference to FIG. As shown in the figure, the track leaf spring 60 of the present embodiment is integrally formed with the fixed support portion 30 and the movable support portion 40 by sandwiching both ends by the whole of the fixed support portion 30 and the movable support portion 40, respectively. It is formed and attached.

As a result, the track leaf spring 60 is very firmly fixed to both the support portions 30, 40,
Since the work of attaching to both the support parts 30 and 40 can also be performed mechanically, a groove is formed on the opposing surface of the fixed support part 30 and the movable support part 40 as performed in the conventional objective lens driving device. There is no need for any complicated work such as fixing with an adhesive having high hardness. Note that a slit is formed in the height direction substantially at the center of the track leaf spring 60 shown in FIG. 3, but this is for increasing the flexibility and the like of the track leaf spring 60, and the objective used is The number can be appropriately increased or decreased or omitted according to the lens driving device.

The damping means 80 comprises a damping plate 81 and a groove 8 with which the damping plate engages.
2 and a damping material 83 filled in the groove 82. The damping plate 81 is a U-shaped plate-like member provided with a pair of arms 81a and 81b extending to one side, and is formed of a highly rigid material such as a metal.

The damping plate 81 is
One side, that is, the rear end side of the U-shape is fixed to the upper surface of the fixed support portion 30 by bonding or the like, and the other side, that is, the pair of arm portions 81a and 81b on the front end side of the U-shape,
A pair of grooves 82 (82) formed on the upper surface of the movable support
a, 82b). This groove 82
Are the arm portions 81 of the damping plate 81 to be engaged.
a, 81b are formed to have a width and a depth that can be moved in the groove. The arms 81a and 81b and the groove 82
A gap between a and 82b is quantitatively filled with a damping material 83, whereby the damping plate 81 is swingably attached to the movable support portion 40.

Here, the size of the gap between the inner dimensions of the grooves 82a and 82b and the outer dimensions of the arms 81a and 81b is determined by the displacement of the movable support 40 with respect to the damping plate 81 due to the movement of the lens holder 20 in the track direction. It is set to be larger than the amount. Further, it is preferable to use a damping material made of, for example, silicon gel or the like, so that the damping material 83 is filled in the groove portion 82 so that the tip portion of the damping plate 81 can be swingably held.

Next, the operation of the objective lens driving device according to the present embodiment having such a configuration will be described. As shown in FIG. 1, in the objective lens driving device according to the present embodiment, a magnetic circuit including a yoke 11 and a magnet 12 connects a focus coil 21 and a track coil 22 in a lens holder 20 similarly to a conventional objective lens driving device. When a current is applied to the focus coil 21 and the track 22, the electromagnetic action between the magnetic circuit and the coil causes the focus leaf spring 50 and the track leaf spring 60 to bend. 1 and a track direction (X-axis direction shown in FIG. 1).

When the lens holder 20 is driven in the track direction, as shown in FIG. 2, the movable support portion 40 has a point O located substantially at the center of the track leaf spring 60 in the Y-axis direction.
It rotates in the direction of arrow M1 shown in FIG. When the movable support portion 40 rotates, the groove 82 of the movable support portion 40
a, 82b and arm 81 of damping plate 81
a and 81b relatively move. Since the groove 82 is filled with the damping material 83, the groove 82a,
The relative displacement between the arm 82b and the arm portions 81a, 81b causes the damping material 83 to undergo compression, tension and shear. As a result, the lens holder 20 is driven in the track direction, but the vibration generated at the time of driving is damped and absorbed by the damping material 83, and the resonance of the track leaf spring 60 is suppressed.

On the other hand, when the lens holder 20 is driven in the focusing direction, as shown in FIG. 3, the movable support section 40 is rotated in the direction of arrow M2 about the center point O2 of the track leaf spring 60 as a fulcrum. Become. Since the arm portion 81a of the damping plate 81 is also floating in the illustrated Z-axis direction with respect to the groove portion 82 of the movable support portion 40, and the gap is also filled with the damping material 83. When the movable support portion 40 rotates, the damping plate 81 vibrates in the direction of the arrow M2 shown in the drawing, and the damping material 83 receives compression and tension. As a result, the secondary resonance generated in the Z-axis direction of the track leaf spring 60 also has a damping effect by the damping material 83 and is damped and absorbed.

As described above, according to the objective lens driving device of the present embodiment, not only reduction of resonance at f0 in the track direction, but also effective damping of secondary resonance in both the track and focus directions. However, in the optical disk device, the access time can be reduced and stable servo characteristics can be realized. Then, the resonance level at f0 in the tracking direction, which has conventionally been a particular problem, can be reduced to a level that does not cause any problem.

FIG. 4 shows the results of actually measuring the frequency characteristics of the objective lens driving device according to the present embodiment and the conventional objective lens driving device. As shown in this figure, in the objective lens driving device of the present embodiment, the resonance level Q1 at f0
Is the resonance level Q0 in the conventional objective lens driving device.
It can be seen that it is held down by about 12 dB as compared to This means that the vibration of the objective lens driving unit caused by the acceleration at the time of access converges earlier than before.

As described above, according to the objective lens driving device of the present embodiment, the movable support portion and the support base are swingably connected by the damping means, so that the damping material is in the compression and tension directions and the shear direction. In addition, it can effectively attenuate and absorb resonance at f0 in the track direction.

As a result, it is possible to effectively attenuate and absorb the secondary resonance caused by the track leaf spring and the unnecessary resonance in the focus direction of the lens holder or the like about the center of the track leaf spring as a fulcrum. Also, the track leaf spring itself is formed as a single metal leaf spring, and is not provided with an elastic layer, etc., so that the supporting portion and the track leaf spring, which could not be realized conventionally due to insufficient damping action, can be integrally formed. This makes it possible to integrally form the movable support portion and the support base, thereby facilitating the manufacturing operation, increasing the efficiency and reducing the cost.

In this embodiment, the damping plate is fixed to the fixed support portion and is swingably attached to the movable support portion. At the same time, the same effect can be obtained by swingably attaching to the fixed support portion side.

[Second Embodiment] Next, a description will be given of a second embodiment of the objective lens driving device according to the present invention. FIG.
FIG. 2 is a partial cross-sectional rear view of a movable support portion showing the first embodiment of the objective lens driving device of the present invention. Also, FIG.
FIG. 7 is an enlarged bottom view showing the movable support and the damping means in the objective lens driving device shown in FIG. 5, and FIG. 7 is an enlarged side view showing the movable support and the damping means.

As shown in these figures, in this embodiment, the basic shape of the objective lens driving device is almost the same as that of the first embodiment. The difference from the first embodiment is that a damping unit 90 is provided instead of the damping unit 80 in the first embodiment, that is, the groove 82 formed in the damping plate 81 and the movable support unit 40.

The damping means 90 in the present embodiment
As shown in FIGS. 5 to 7, a pair of cylindrical projections 91 a and 91 b projecting from the bottom surface of the movable support portion 40 toward the support base 10, and the pair of projections 91 a and 91 b
And a pair of holes 92a and 92b formed on the support base 10 side so that the holes 92a and 92b are engaged in a loose state.
and a damping material 93 which is filled in the b and holds the projections 91a and 91b in a swingable manner.

The protrusions 91a and 91b and the holes 92a and 92b
Are located equidistant from the rotation center point O3 of the track leaf spring 60, as shown in FIG.
b and the center positions of the holes 92a and 92b substantially coincide with each other.
The holes 92a and 92b are engaged with the projections 9 to be engaged.
1, 91b are formed in a diameter and a depth which can be moved in the hole.

Here, the size of the gap between the inner diameter of the holes 92a and 92b and the outer diameter of the projections 91a and 91b is larger than the displacement of the movable support 40 due to the movement of the lens holder 20 in the track direction. It is formed so that it becomes.
Note that, also in the present embodiment, the fixed support portion 30, the movable support portion 40, and the track leaf spring 60 are integrally formed.

As shown in FIG. 6, the damping means 90 of the present embodiment having the above-described structure is configured such that when the movable support portion 40 rotates around the point O3,
Compression and tension are applied due to relative position fluctuations of a (91b) and 92a (92b), and a vibration damping action works in the M3 direction with the point O on the Y axis of the track leaf spring 60 as a fulcrum. Further, as shown in FIG. 7, the secondary damping in the M4 direction generated around the point O4 of the movable support portion 40 also exerts a vibration damping action on the damping material in the shearing direction.

As described above, also in the objective lens driving device according to the present embodiment, it is possible to effectively reduce the secondary resonance generated at the time of driving the lens. As in the case of the first embodiment, FIG. The measurement result of the indicated frequency characteristic is obtained.

[0056]

As described above, according to the objective lens driving device of the present invention, the vibration of the lens holder and the leaf spring supporting the lens holder during the driving of the lens is effectively attenuated and absorbed, and the natural vibration particularly in the track direction. The resonance level of several f0 can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a first embodiment of an objective lens driving device of the present invention.

FIG. 2 is an enlarged plan view showing a movable support unit and a damping unit in the objective lens driving device shown in FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a graph showing a result of actually measuring frequency characteristics of the objective lens driving device of the present invention and a conventional objective lens driving device.

FIG. 5 is a partial cross-sectional rear view of a movable support unit showing a second embodiment of the objective lens driving device of the present invention.

FIG. 6 is an enlarged bottom view showing a movable support portion and a damping unit in the objective lens driving device shown in FIG.

FIG. 7 is an enlarged side view showing a movable support section and damping means in the objective lens driving device shown in FIG.

FIG. 8 is an overall perspective view showing a conventional objective lens driving device.

9 is an enlarged plan view showing a mounting portion of a track leaf spring in the conventional objective lens driving device shown in FIG.

FIG. 10 is an enlarged plan view showing a mounting portion of a track leaf spring in another conventional objective lens driving device.

11 is an exploded plan view showing a track leaf spring in the conventional objective lens driving device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Objective lens 10 ... Support base 20 ... Lens holder 30 ... Fixed support part 40 ... Movable support part 50 ... Focus leaf spring 60 ... Track leaf spring 70 ... Adhesive 80 ... Damping means 81 ... Damping plate 82 ... Groove part 83 ... Damping Material 90: Damping means 91: Damping plate 92: Groove 93: Damping material

Claims (3)

(57) [Claims] 1. A support base provided with a magnetic circuit, a lens holder provided with a tracking coil and a focus coil and holding an objective lens, and a support base rotatable in a tracking direction via a track leaf spring. An attached movable support portion, comprising a focus leaf spring that connects the lens holder and the movable support portion so as to be rotatable in a focus direction, wherein the lens holder includes the magnetic circuit and the coils. An objective lens driving device driven in a tracking direction and a focusing direction by an electromagnetic action of the above, further comprising damping means for swingably connecting the movable support portion to the support base, and one side of the damping means being connected to the support base. Fixed and the other side in front
Before the damping plate attached to the movable support portion and the other side of the damping plate are movably engaged.
A groove formed in the movable supporting portion, and the other side of the damping plate being filled in the groove.
And a damping material for swingably holding the objective lens. A support base having a magnetic circuit;
Objective lens with king coil and focus coil
Lens holder for holding
In the tracking direction via the plate spring
The attached movable support, the lens holder and the front
The movable support section is connected to the movable
Focusing lens leaf spring, and the lens holder
-By the electromagnetic action of the magnetic circuit and each coil
Object driven in tracking and focus directions
In the lens driving device, the movable support portion is swingably connected to the support base.
A damping means , one side of which is fixed to the movable support portion and the other side is a front side.
Before the damping plate attached to the support base and the other side of the damping plate are movably engaged.
A groove formed in the support base, and the other side of the damping plate being filled in the groove.
And a damping material for swingably holding the
Characteristic objective lens driving device. A support base having a magnetic circuit;
Objective lens with king coil and focus coil
Lens holder for holding
In the tracking direction via the plate spring
The attached movable support, the lens holder and the front
The movable support section is connected to the movable
Focusing lens leaf spring, and the lens holder
-By the electromagnetic action of the magnetic circuit and each coil
Object driven in tracking and focus directions
In the lens driving device, the movable support portion is swingably connected to the support base.
Comprising a damping means, the damping means, is formed a protrusion projecting from the movable support, the support base the projection is engaged in a loosely fitted state
The hole and the projection of the movable support part which are filled in this hole can be swung.
And a damping material for holding
An objective lens driving device that.