JPH10312558A - Optical pickup device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the cost, the damping material does not flow out of the gap between the flexible printed circuit board and the damper base, and therefore the quality is improved, the manufacturing is easy, and four suspensions are provided. Provided is an optical pickup device capable of improving the balance of wires and improving the vibration characteristics of an actuator. SOLUTION: A lens holder for holding an objective lens, a focusing coil and a tracking coil provided on the lens holder, and the lens holder is moved in a focusing direction and a tracking direction with respect to a damper base fixedly arranged. An optical pickup device including a suspension wire for supporting the coil and supplying power to the coil, wherein one end of the suspension wire penetrates the damper base from one end to the other end to form a protruding end; It is fixed with an ultraviolet curable resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for recording and reproducing information on and from an optical disk, and more particularly, to a support structure for an actuator of the optical pickup device.

[0002]

2. Description of the Related Art Conventionally, such an optical pickup device is described in, for example, Japanese Utility Model Registration No. 2521564. 6 to 8 are views showing an optical pickup device according to the related art. In FIG. 6, an optical pickup device 51 includes a lens holder 3 for holding the objective lens 2, a focusing coil 3a and a tracking coil 3b wound around a coil bobbin provided in the lens holder 3, and a lens holder 3. And a suspension wire 5 movably supporting the damper base 4 fixedly disposed in the focusing direction F and the tracking direction T.

In the case of the drawing, the suspension wires 5 penetrate through the side surfaces and the damper base 4 on both sides of the lens holder 3 and are soldered to form solder fixing portions 5a, and are mechanically fixed. A total of four suspension wires 5 are provided as a whole so as to be electrically connected and connected between the side surface of the lens holder 3 and the damper pace 4. In this case, the gel damping materials 5b, 5b mainly composed of silicon are filled and hardened to prevent resonance, and the damping materials 5b, 5b dampen the vibration, whereby the lens holder 3 is supported in a cantilever manner. Without being tilted, harmful vibrations can be suppressed in the focusing direction F and the tracking direction T, and can be translated.

[0004] The focusing coil 3a and the tracking coil 3b have their winding terminals connected to terminals 3c and 3d provided on the lens holder 3 (two terminals provided on the other side of the lens holder 3 are connected to each other). , Not shown). One end of the suspension wire 5 is mechanically fixed and electrically connected to these terminals 3c and 3d by soldering. On the other hand, the other end of the suspension wire 5 penetrates the damper base 4 and protrudes from the rear end face of the damper base 4.

Further, on the rear end face of the damper base 4,
As shown in FIG. 8, a printed board 56 is attached. The printed circuit board 56 is connected from a terminal 56a through which the other end of the suspension wire 5 protruding from the rear end face of the damper base 4 penetrates and is connected by soldering, to a connection terminal provided on the lower edge of the printed circuit board 56. 5
A conductive pattern 56c extending to 6b is provided. The connection terminal portion 56b of the printed board 56 is further connected to an external driving voltage supply source via a flexible printed board 57.

Further, in FIGS. 6 and 7, two yokes are fixedly arranged on the damper base 4. The yoke is arranged such that the two ends 8a and 8b sandwich the lens holder 3 at an interval from a horizontal direction perpendicular to the tracking direction. further,
Magnets 9a, 9b are provided on the inner surfaces of the ends 8a, 8b facing the lens holder 3.

In the conventional optical pickup device 51 configured as described above, the windings of each coil wound around the coil winding portion of the lens holder 3 are respectively composed of the suspension wire 5, the printed board 56, and the flexible printed board. Through 57, it is connected to an external drive voltage supply source. Thus, a driving voltage is supplied from the outside to each of the coils 3a and 3b, so that a magnetic field is generated in the focusing coil 3a or the tracking coil 3b, and the magnetic flux is formed by the yoke 8 and the magnets 9a and 9b. Further, by interacting with the magnetic flux passing through these coils 3a and 3b, this lens holder 3
Can be moved in the focusing direction F and the tracking direction T. Thus, the objective lens 2 attached to the lens holder 3 can be appropriately moved in the focusing direction F and the tracking direction T.

[0008]

However, in the conventional optical pickup device 51 having such a configuration,
The other end of each suspension wire 5 penetrates through the damper base 4 and is fixed by soldering to the terminal portion 56a of the printed circuit board 56, and then silicon gel is injected.

Further, the terminal portion 5 of the printed circuit board 56
6a through the conductive pattern 56c.
b, and the connection terminal portion 56b is soldered to the flexible printed circuit board 57. For this reason, it is necessary to fix and hold the suspension wire 5 at the time of soldering, and there is a disadvantage that the adjustment is difficult.

Further, a printed circuit board 56 is required for relaying from the suspension wires 5 to the flexible printed circuit board 57, and the flexible printed circuit board 7 must be connected by soldering or the like. And the silicon gel injected as a damping material flows out between the damper base 4 and the printed circuit board 56, resulting in a problem that workability is not very good.

Therefore, one technical problem of the present invention is to provide a pickup device that can reduce the cost.

Another technical object of the present invention is to provide a pickup device in which the damping material does not flow out of the gap between the flexible printed circuit board and the damper base, so that the quality is improved and the manufacturing is easy. .

It is another technical object of the present invention to provide an optical pickup device in which the balance between four suspension wires is improved and the vibration characteristics of an actuator can be improved.

[0014]

According to the present invention, there is provided a lens holder for holding an objective lens, a focusing coil and a tracking coil provided on the lens holder, and a damper fixedly disposed with the lens holder. In an optical pickup device including a suspension wire for movably supporting a base in a focusing direction and a tracking direction and supplying power to the coil, one end of the suspension wire passes through the damper base from one end to the other end. To form a protruding end, and one end of the suspension wire at the other end is fixed with an ultraviolet curing resin.

Further, according to the present invention, in the optical pickup device, the damper base includes a through hole that penetrates from one end to the other end and through which one end of the suspension wire passes. An optical pickup device is provided on the other end side, which is provided with cuts provided from both side surfaces of the damper base toward the through holes.

Further, according to the present invention, in any one of the optical pickup devices, a flexible printed circuit board abuts on the other end of the damper base through a protruding end of the suspension wire, and the protruding end is soldered. An optical pickup device characterized in that the flexible printed board is fixed to the other end surface of the damper base.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an optical pickup device according to a first embodiment of the present invention. FIGS. 2 to 3A and 3B are views for explaining a wire support structure of the actuator of the optical pickup device of FIG.

In FIG. 1, an optical pickup device 1 comprises:
A lens holder 3 for holding the objective lens 2, a focusing coil 3a and a tracking coil 3b wound around a coil bobbin provided in the lens holder 3;
And a suspension wire 5 for supporting the lens holder 3 movably in a focusing direction F and a tracking direction T with respect to a fixedly disposed damper base 4.
And

As the suspension wires 5, a total of four suspension wires 5 are arranged in two pairs.

As best shown in FIG. 2, one end of each suspension wire 5 is soldered through both sides of the lens holder 3 and the damper base 4 on both sides of the lens holder 3, respectively. And are mechanically fixed and electrically connected. The other end of each suspension wire 5 penetrates through a through hole 4a formed from one end 4b to the other end 4c of the damper base 4 and projects outward. It is fixed by filling with resin (UV resin) 7, and furthermore, the flexible printed circuit board 6 is brought into contact with the outer surface of the damper base 4 and soldered to form a solder fixing portion 5c.

Further, at the other end of the suspension wire 5, the side surface of the lens holder 3 and the damper base 4
In this case, gel damping materials 5b, 5b containing silicon as a main component are filled and hardened to prevent resonance, and vibration damping is performed by these damping materials 5b, 5b. , The lens holder 3
Without being inclined by being supported by the cantilever, harmful vibrations are suppressed in the focusing direction F and the tracking direction T, and the rod can be moved in parallel.

The focusing coil 3a and the tracking coil 3b have their winding terminals connected to terminals 3c, 3d, etc. provided on the lens holder 3 (two terminals provided on the other side of the lens holder 3). , Not shown). One end of the suspension wire 5 is mechanically fixed and electrically connected to the terminals 3c and 3d by soldering 5a. On the other hand, the other end of the suspension wire 5 penetrates the damper base 4 and protrudes from the rear end surface of the damper base 4.

Further, on the rear end face of the damper base 4,
As shown in FIGS. 3A and 3B, the flexible printed circuit board 6 is directly attached. The flexible printed circuit board 6 is provided at the lower end edge of the flexible printed circuit board 6 through a through hole 6a through which the other end of the suspension wire 5 protruding from the rear end face of the damper base 4 penetrates and is connected by soldering. The pattern 6b is provided with a connector connected to an external drive voltage supply source (not shown).

Referring again to FIGS. 1 and 2, two yokes are fixedly arranged on the damper base 4. The yoke is arranged such that the two ends 8a and 8b sandwich the lens holder 3 at an interval from a horizontal direction perpendicular to the tracking direction. Further, magnets 9a, 9b are provided on the inner surfaces of the ends 8a, 8b facing the lens holder 3.

In the optical pickup device 1 configured as described above, the windings of the respective coils wound around the coil winding portions of the lens holder 3 are externally connected via the suspension wires 5 and the flexible printed circuit board 7, respectively. Is connected to the driving voltage supply source. As a result,
When a driving voltage is supplied to each of the coils 3a and 3b, a magnetic field is generated in the focusing coil 3a or the tracking coil 3b, and the magnetic flux is formed by the yoke 8 and the magnets 9a and 9b. The lens holder 3 can be moved in the focusing direction F and the tracking direction T by interacting with the magnetic flux passing through the lens holder 3. Thus, the objective lens 2 attached to the lens holder 3 can be appropriately moved in the focusing direction F and the tracking direction T.

Next, a method of fixing the suspension wire 5 to the damper base 4 will be described with reference to FIGS. 3 (a) and 3 (b). In order to fix the suspension wire 5, first, as shown in FIG. 3A, the suspension wire 5 is inserted into the through hole 4b of the damper base 4, and the other end is made to protrude to be a protruding end 5d. Next, U
The V resin 7 is filled in the other end 4c side of the damper base of the through hole 4a, cured by irradiating ultraviolet rays, and fixed with the protruding end 5d of the other end of the suspension wire 5 protruding. Next, projecting ends 5d are formed in through holes 6a formed in the flexible printed circuit board 6 for sending current to the coil.
After the flexible printed circuit board 6 is brought into contact with the other end 4a of the damper base 4, the protruding end 5d is soldered to form a solder fixing portion, and as shown in FIG. The flexible printed circuit board 6 is fixed to the other end 4a of the flexible printed circuit board. Then, the gel-like damping materials 5b, 5
b is inserted from the other end 4c of the damper base 4 and hardened.

FIG. 4 is a view for explaining a wire support structure of an actuator of an optical pickup device according to a second embodiment of the present invention. FIG. 5 (a) and (b)
FIG. 5 is a perspective view used for describing the assembly of the wire support structure of the actuator in FIG. 4.

The wire support structure of the actuator of the optical pickup device according to the second embodiment shown in FIG. 4 is the same as that shown in the first embodiment except that the structure of the damper base 4 is different. It has a configuration of That is, in the wire support structure of the actuator according to the second embodiment, a notch 4d penetrating from the front and back (up and down in the figure) to the through hole 4a is provided on the other end 4c side of the damper base 4. Is different.

Next, a method of fixing the suspension wire 5 of the optical pickup device according to the second embodiment will be described.

First, in order to fix the suspension wire 5, as shown in FIG. 5A, the suspension wire 5 is inserted through the through hole 4a of the damper base 4 from one end 5b to the other end 4c. The other end of the suspension wire 5 protrudes from the other end 4c of the damper base 4 to be a protruding end 5d. Next, the UV resin 7 is cut into 4d
The suspension wire 5 is cured by irradiating it with ultraviolet light, and is fixed with the protruding end 5 d formed at the other end of the suspension wire 5. Next, projecting ends 5d are formed in through holes 6a formed in the flexible printed circuit board 6 for sending current to the coil.
After the flexible printed circuit board 6 is brought into contact with the other end 4a of the damper base 4 as shown in FIG. 3 (b), the protruding end 5d and the pattern of the through hole 6a are soldered. A fixing portion 5c (see FIG. 4) is formed, and FIG.
As shown in (1), a flexible printed board 6 is fixed to the other end 4a of the damper base 4. Thereafter, the gel-like damping materials 5b, 5b are connected to one end 4c of the damper base 4.
And is hardened.

As described above, in the optical pickup device according to the second embodiment of the present invention, the provision of the cut 4d on the other end 4c side of the damper base 4 facilitates the injection of the UV resin. Ultraviolet irradiation is facilitated, and the suspension wire 5 can be fixed more easily than in the first embodiment.

[0033]

As described above, according to the present invention,
Since a printed circuit board is not used, a pickup device that can reduce costs can be provided.

According to the present invention, since the through holes of the damper base are filled with the UV resin, the damping material does not flow out of the gap between the flexible printed circuit board and the damper base. A simple pickup device can be provided.

In the case of only soldering, the suspension wire must be fixed by applying a stress to the suspension wire by pressing the soldering iron. However, according to the present invention, since the UV resin is used, the free end of the wire must be fixed. Since it can be fixed without stress, the balance of the four wires is improved, and an optical pickup device that can improve the vibration characteristics of the actuator can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an optical pickup device according to a first embodiment of the present invention.

FIG. 2 is a diagram which is used for describing a wire support structure of an actuator of the optical pickup device of FIG.

3 (a) and 3 (b) are diagrams for explaining a wire support structure of an actuator of the optical pickup device of FIG. 1;

FIG. 4 is a cross-sectional view for explaining a support structure of a wire of an actuator of an optical pickup device according to a second embodiment of the present invention.

5 (a) and 5 (b) are perspective views used to explain the assembly of the wire support structure of the actuator of FIG. 4;

FIG. 6 is an exploded perspective view showing an optical pickup device according to the related art.

FIG. 7 is a sectional view showing a suspension wire support of the optical pickup device of FIG. 6;

FIG. 8 is a perspective view showing the assembly of the suspension wire support of FIG. 7;

[Explanation of symbols]

 1,51 Optical pickup device 2 Objective lens 3 Lens holder 3a Focusing coil 3b Tracking coil 3c, 3d Terminal 4 Damper base 4a Through hole 4b One end 4d Cut 4c Other end 5 Suspension wire 5a, 5c Solder fixing part 5b Damping material 5d Protruding end 6,57 Flexible printed board 6a Through hole 6b Conductive pattern 7 UV curable resin (UV resin) 8a, 8b End 9a, 9b Magnet 56 Printed board 56a Terminal 56b Connection terminal 56c Conductive pattern

Claims (3)

[Claims] 1. A lens holder for holding an objective lens, a focusing coil and a tracking coil provided on the lens holder, and a focusing direction and a tracking direction with respect to a damper base on which the lens holder is fixedly arranged. In an optical pickup device including a suspension wire that movably supports and supplies power to the coil, one end of the suspension wire forms a protruding end through the damper base from one end to the other end. An optical pickup device, wherein one end of the suspension wire is fixed at an end with an ultraviolet curable resin. 2. The optical pickup device according to claim 1, wherein the damper base includes a through hole that penetrates from one end to the other end, and through which one end of the suspension wire passes, and the other end of the damper base. An optical pickup device comprising: a notch provided on both sides from both sides of the damper base toward the through hole. 3. The optical pickup device according to claim 1, wherein a flexible printed board abuts on the other end of the damper base through a protruding end of the suspension wire, and the flexible printed board is soldered to the protruding end. An optical pickup device, wherein a substrate is fixed to the other end surface of the damper base.