JPH0916993A - Optical pickup device - Google Patents

Abstract

PURPOSE: To provide an optical pickup device capable of connecting suspension springs to a drive power source with simple constitution and a low cost. CONSTITUTION: This device is the optical pickup device containing a lens holder 12 holding an objective lens, a focusing coil and a tracking coil wound around the coil wind part of the lens holder and the suspension springs 14 movably supporting the lens holder for a damper base 13 fixedly arranging the lens holder in the directions of focusing and tracking and energizing to the coils. The suspension springs are supported to the damper base, and an energizing flexible printed circuit board 15 to respective coils from the outside is soldered directly to terminals 14D projecting from the damper base end surface of the suspension springs.

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 used for recording and / or reproducing signals on an optical disc.

[0002]

2. Description of the Related Art Conventionally, such an optical pickup device is constructed, for example, as shown in FIGS. That is, in FIG. 7 and FIG. 9, the optical pickup device 1 includes a lens holder 3 for holding the objective lens 2, a focusing coil 3 a and a tracking coil 3 b wound around a coil bobbin provided in the lens holder 3. , A suspension spring 5 for movably supporting the lens holder 3 with respect to a fixed damper base 4 in a focusing direction F and a tracking direction T.
And

In the illustrated case, the suspension springs 5 are soldered 5a by penetrating the side surface and the damper base 4 on both sides of the lens holder 3, respectively, and are mechanically fixed and electrically connected. Two pairs of suspension springs 5 in total are arranged so as to connect 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 damping is performed by the damping materials 5b, 5b, whereby the lens holder 3 is supported in a cantilever manner. The harmful vibration is suppressed in the focusing direction F and the tracking direction T without being tilted, and the translation can be performed.

In the focusing coil 3a and the tracking coil 3b, the winding ends are terminals 3c and 3d provided on the lens holder 3 (two terminals provided on the other side of the lens holder 3 are , Not shown). Then, one end of the suspension spring 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 spring 5 penetrates the damper base 4 and projects from the rear end surface of the damper base 4.

Further, on the rear end surface of the damper base 4,
As shown in FIG. 9, the printed circuit board 6 is attached. The printed circuit board 6 is provided with a connection terminal part disposed at the lower end edge of the printed circuit board 6 from a terminal part 6a through which the other end of the suspension spring 5 protruding from the rear end surface of the damper base 4 penetrates and is connected by soldering. A conductive pattern 6c extending to 6b is provided. The connection terminal portion 6b of the printed circuit board 6 is further connected to an external drive voltage supply source.
Connection is made via the flexible printed circuit board 7.

Further, in FIGS. 7 and 8 showing the conventional example, two yokes 8 are fixedly arranged with respect to the damper base 4. This yoke 8 has two ends 8a, 8
The lenses b are arranged so as to sandwich the lens holder 3 with a space from the horizontal direction perpendicular to the tracking direction. Further, magnets 9a and 9b are provided on the inner surfaces of the end portions 8a and 8b facing the lens holder 3.

In the optical pickup device 1 thus constructed, the winding of each coil wound around the coil winding portion of the lens holder 3 includes the suspension spring 5, the printed circuit board 6 and the flexible printed circuit board 7, respectively. Via an external drive voltage supply source. As a result, a driving voltage is supplied from the outside to the coils 3a and 3b, whereby a magnetic field is generated in the focusing coil 3a or the tracking coil 3b, and the magnetic flux is
The lens holder 3 can be moved in the focusing direction F and the tracking direction T by interacting with the magnetic flux formed by the yoke 8 and the magnets 9a, 9b and passing through the coils 3a, 3b. 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 optical pickup device 1 having such a configuration, each suspension spring 5 has its other end penetrating the damper base 4 and being connected to the terminal portion 6a of the printed circuit board 6. Have been soldered. Further, the connection terminal portion 6b of the printed board 6 is soldered to the flexible printed board 7. Therefore, in order to hold the suspension spring 5 fixedly and relay it to the flexible printed circuit board 7, a printed circuit board 6 is required, and a soldering step is required, resulting in an increase in component cost and assembly cost. There was a problem that the sex was not so good.

In view of the above points, an object of the present invention is to provide an optical pickup device which has a simple structure and can be connected to a drive power source with a suspension spring at low cost.

[0010]

According to the present invention, there is provided a lens holder for holding an objective lens, and a focusing coil and a tracking coil wound around a coil winding portion of the lens holder. In the optical pickup device, the suspension spring includes a suspension spring that supports the lens holder so as to be movable in a focusing direction and a tracking direction with respect to a fixedly disposed damper base and that supplies power to the coil. This is achieved by an optical pickup device in which a flexible printed circuit board for supplying power to each coil from the outside is directly soldered to the tip of the suspension spring that is supported by the base and protrudes from the damper base end surface. It

[0011]

According to the above construction, the suspension spring is held by the damper base, and the flexible printed circuit board for feeding power from the outside is directly soldered to the tip protruding from the end face of the damper base. It is attached. Therefore, a printed circuit board for holding and relaying the suspension spring as in the prior art is not required, and the number of parts can be reduced. As a result, the component cost and the assembly cost can be reduced, and the workability can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. In addition, since the Examples described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

1 to 6 show an embodiment of an optical pickup device according to the present invention. 1 to 3, an optical pickup device 10 includes a lens holder 12 that holds an objective lens 11, a focusing coil 12a and a tracking coil 12b that are wound around a coil winding portion provided in the lens holder 12. And a suspension spring 14 for movably supporting the lens holder 12 in a focusing direction F and a tracking direction T with respect to a damper base 13 fixedly arranged.

The lens holder 12 is resin-molded,
While holding the objective lens 11 at one end, the objective lens 1
Other than 1 are hollow portions forming the coil winding portion, and the focusing coil 12a and the tracking coil 12b are wound.

The damper base 13 is formed by punching out a metal plate such as a metal plate, and has mounting holes 13c, 1 at the tip thereof.
3c is provided, a yoke 17 integrally formed by bending is provided at substantially the center, and a resinous base portion 13a to which the end of the suspension spring 14 is attached at the other end.
Is fixed with a screw 13b.

In the illustrated case, the suspension springs 14 are provided on both sides of the lens holder 12 so as to connect the upper surface thereof to the upper surface of the damper base 13 (base portion 13a). The lower surface of both sides of the lens holder 12 and the damper base 13 (the base portion 13
A suspension spring that connects the lower surface of a) is also provided, and a total of four suspension springs 14 are provided in two pairs. As a result, the lens holder 12 can be translated in the focusing direction F and the tracking direction T without tilting.

Further, each suspension spring 14 described above
Is preferably on both ends or on one side, especially on the side close to the damper base 13 (base portion 13a), but in the case of the drawings, the vibration damping portion 14 is provided on both end portions thereof as shown in an enlarged view in FIG.
a. The vibration damping portion 14a is formed in a spiral shape so as to surround the enlarged portion 14b from the vicinity of the root of the enlarged portion 14b that extends straight from one side and has a slightly larger diameter. It is composed of a portion 14c and a damping material 14d provided so as to cover the entire enlarged portion 14b and the annular portion 14c.

The damping material 14d is applied to the damping portion 14a of each suspension spring 14 as shown in FIG. 4 (A), after the liquid damping material 14d is dripped. It is constituted by curing as shown in FIG. In this case, the dropped liquid damping material 14d surrounds the enlarged portion 14b at the center and has a peripheral edge of the annular portion 14d due to the surface tension.
It adheres to the vibration damping portion 14a in a substantially arcuate shape so as to be located along c. Therefore, the cured damping material 14d is
By connecting the expanding portion 14b and the annular portion 14c in an arc shape, it is possible to suppress the individual vibrations of the expanding portion 14b and the annular portion 14c and also suppress the mutual vibrations of the expanding portion 14b and the annular portion 14c. . Thus, the damping of each suspension spring 14 can be effectively performed.

Further, on both sides of the upper and lower surfaces of the damper base 13 (base portion 13a) and the lens holder 12, paragraphs are provided in order to suppress the thickness of the entire optical pickup device 10 as much as possible.
21 and 30, 31 are provided. The suspension spring mounting portions 20, 21 and 30, 31 are not limited to being formed on both sides of the upper and lower surfaces of the damper base 13 and the lens holder 12, and may be on the same surface depending on design values. Depending on the design value, it may be formed on one side only, or may be formed on either the damper base 13 or the lens holder 12.
It is formed appropriately.

The suspension spring mounting portions 20, 21
Since 30, and 31 are configured symmetrically to each other,
The suspension spring mounting portion 20 will be described below. That is, as shown in FIG. 5, the suspension spring mounting portion 20 includes pins 20a that are planted so as to extend vertically on the upper surface and the lower surface (the lower surface is not shown) of the damper base 13 (base portion 13a). There is.

On the other hand, the suspension spring 14
The end portion 14A is formed into a substantially rectangular shape by being laterally enlarged, and a terminal 14D for taking out the power source projects on the opposite side of the rectangular portion, and a caulking hole 14B is formed near the center of the rectangular portion. I have it. This caulking hole 14B,
In the illustrated case, a plurality of (6 in the illustrated case) engagement claws 14C having an inner diameter larger than the diameter of the pin 20a and provided at equal angular intervals, projecting inward in the radial direction.
The tip of the engaging claw 14C extends inward beyond the diameter of the pin 20a. Incidentally, reference numeral 14E in the drawing denotes an engagement hole with which the positioning projection 20b is engaged.

As a result, the end portion of the end portion 14A of the suspension spring 14 is placed on the suspension spring mounting portion 20 of the damper base 13, and the pin 20a of the suspension spring mounting portion 20 is placed in the caulking hole 14B. By inserting and pressing the end portion 14A, the caulking hole 1 provided in the end portion 14A of the suspension spring 14
The engaging claw 14C of 4B is formed by the outer peripheral surface of the pin 20a.
The pin 20a is moved in the base direction while being deformed so as to be curved. Then, as shown in FIGS. 5A, 5B and 5C, the end portion 14A of the suspension spring 14 is in contact with the surface of the suspension spring mounting portion 20. , But is temporarily fixed to the suspension spring mounting portion 20, and then, as shown in FIG. 4, the resin 22 is applied onto the pin 20a and cured to be fixed by caulking.

As shown in FIGS. 1 and 2, the focusing coil 12a and the tracking coil 12b are used.
Is the suspension spring mounting portion 30,
At 31, an end of the suspension spring 14 is soldered 12c and 12d (two solders provided on the lower surface of the lens holder 12 are not shown) to be electrically connected.

Further, the damper base 13 (base portion 13
A flexible printed circuit board 15 connected to an external drive voltage supply source is attached to the end face of a). The flexible printed circuit board 15 has conductive patterns 15a used as two sets of wirings connected to a drive voltage supply source (not shown), and the top and bottom surfaces of the damper base 13 are provided at the tip of each conductive pattern 15a. It has four terminal portions 15b to which the terminals 14D protruding from the end surface of the damper base 13 of the suspension spring 14 fixed by the suspension spring mounting portion 20 are soldered.

Further, a yoke 17 is fixedly arranged on the damper base 13. The yoke 17 has a U-shape when viewed from the side, and the two yokes 17 and 17 are arranged so as to sandwich the lens holder 12 at a distance from the horizontal direction perpendicular to the tracking direction. It is set up. Further, on the inner surfaces of the yokes 17, 17 facing the lens holder 12, the magnets 18,
18 are provided.

The optical pickup device 10 according to the present invention comprises:
The coils of the coils 12a and 12b wound around the coil winding portion of the lens holder 12 are configured as described above, and the external drive voltage is supplied via the suspension spring 14 and the flexible printed board 15, respectively. Connected to the source. As a result, each coil 12a, 1
By supplying the drive voltage to 2b, a magnetic field is generated in the focusing coil 12a or the tracking coil 12b. The magnetic flux generated by each of the coils 12a and 12b interacts with the magnetic flux formed by the yoke 17 and the magnets 18 and 18 and passing through the coils 12a and 12b, so that the focusing direction F is applied to the lens holder 12. And a force in the tracking direction T acts. Thus, the objective lens 11 attached to the lens holder 12 can be appropriately moved in the focusing direction F and the tracking direction T.

In this case, each suspension spring 14
The terminal 14D is connected to the damper base 13 (the base portion 13
In the suspension spring mounting portions 20 and 21 of a),
The terminal 14 is fixed and held as shown in FIG.
As shown in FIG. 6, D projects from the end surface of the damper base 13 (base portion 13a), and this terminal 14D is
Each terminal portion 15 of the flexible printed circuit board 15
By being soldered to b, the terminal 14D of the suspension spring 14 is electrically connected to the flexible printed board 15 connected to the external drive voltage supply source.

In the above embodiment, the suspension spring 14 is provided with the control section 14a, but the present invention can be applied to the case where the control section 14a is not provided. It is obvious that the suspension spring mounting portions 20, 21 and 30, 31 can also be applied to different mounting structures.

[0029]

As described above, according to the present invention, the suspension spring is held by the damper base, and the terminal projecting from the end face of the damper base is used for external power feeding. The flexible printed circuit board is directly soldered. Therefore, unlike the conventional case, a printed circuit board for holding and relaying the suspension spring is not required, and the number of parts can be reduced. As a result, the cost of parts can be reduced and the workability can be improved.

Thus, according to the present invention, it is possible to provide an extremely excellent optical pickup device which has a simple structure and can be connected to the drive power source at low cost.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the optical pickup device of FIG.

3 is a cross-sectional view of the optical pickup device of FIG.

4A and 4B show suspension springs in the optical pickup device of FIG. 1, where FIG. 4A is an enlarged perspective view of a vibration damping member being dropped onto a vibration damping portion, and FIG.

5A and 5B show suspension spring mounting portions in the optical pickup device of FIG. 1, and FIG.
(B) is a plan view of the assembled state, and (C) is a sectional view.

6A and 6B show a connecting portion of a flexible printed circuit board for power supply in the optical pickup device of FIG. 1, FIG. 6A is a partial perspective view, and FIG.

FIG. 7 is a schematic exploded perspective view showing an example of a conventional optical pickup device.

8 is a cross-sectional view showing a state where the optical pickup device of FIG. 7 is assembled.

9 is a partial enlarged perspective view showing a connecting portion of a power feeding flexible substrate in the optical pickup device of FIG.

[Explanation of symbols]

 10 Optical Pickup Device 11 Objective Lens 12 Lens Holder 12a Focusing Coil 12b Tracking Coil 13 Damper Base 13a Base Part 14 Suspension Spring 14A Other End 14B Caulking Hole 14C Engaging Claw 14D Terminal 14a Vibration Suppressing Part 15 Printed Circuit Board 15a Conductive Pattern 15b Terminal part 17 Yoke 18 Magnet 20,21 Suspension spring mounting part 20a Pin 22 Resin

Claims (1)

[Claims] 1. A lens holder for holding an objective lens, a focusing coil and a tracking coil wound around a coil winding portion of the lens holder, and a focusing for a damper base on which the lens holder is fixedly arranged. In an optical pickup device, the suspension spring is movably supported in a tracking direction and a tracking direction, and includes a suspension spring that supplies electric power to the coil. An optical pickup device characterized in that a flexible printed circuit board for feeding power to each coil from outside is directly soldered to a tip protruding from the end face of the base.