JP2001084617A - Optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup capable of easily, speedily and accurately positioning a suspension wire. SOLUTION: The optical pickup has a pickup base, an actuator base, a damper base and an actuator composed of a fixed part and a movable part. The fixed part is composed of a yoke and a permanent magnet connected to the yoke. The movable part is composed of an objective lens, a lens holder for holding the objective lens, a tracking coil and a focusing coil installed on the lens holder. The movable part is supported through four suspension wires to the damper base so as to displace. The lens holder is provided with a first wire fixing part 12 formed with a square-formed hole part 13 for inserting one end side of the suspension wire and the damper base is provided with a second wire fixing part formed with the square-formed hole part for inserting the other end side of the suspension wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical pickup.

[0002]

2. Description of the Related Art An optical pickup is mounted on various optical disk devices such as a CD-ROM drive mounted on a personal computer or the like.

FIG. 8 is a plan view showing a main part of a conventional optical pickup, FIG. 9 is a sectional view taken along the line CC in FIG. 8, and FIG. 10 is a sectional view taken along the line DD in FIG. It is sectional drawing.

As shown in FIG. 8, a conventional optical pickup 100 includes a lens holder 120 and a lens holder 1.
It has a damper base 130 that displaceably supports 20 via four suspension wires 140 and a yoke provided with a permanent magnet (not shown).

[0005] The lens holder 120 includes the objective lens 11.
0 is supported, and a tracking coil and a focusing coil (not shown) are provided.

The lens holder 120 is provided with four wire fixing portions 121. Each wire fixing part 12
Each of the holes 1 has a hole (through hole) 125 into which one end (left side in FIG. 8) of the suspension wire 140 is inserted.

As shown in FIG. 9, the cross section of the hole 125 of the wire fixing portion 121 is circular.
The inner diameter (diameter) of No. 5 is set to be larger than the diameter (diameter) of the suspension wire 140.

Further, the damper base 130 is provided with four wire fixing portions 133. Each wire fixing part 1
33, holes (through holes) 135 into which the other ends of the suspension wires 140 (the right side in FIG. 8) are inserted.
Are formed.

[0009] As shown in FIG.
The cross-sectional shape of the hole 135 is circular.
The inner diameter (diameter) of 35 is set larger than the diameter (diameter) of suspension wire 140.

When assembling the optical pickup 100,
As shown in FIG. 8, one end of each suspension wire 140 is inserted into the hole 125 of the wire fixing portion 121 and fixed to the wire fixing portion 121 by soldering.

The other end of each suspension wire 140 is inserted into the hole 135 of the wire fixing portion 133, and is soldered through a circuit board (not shown) provided on the damper base 130. It is fixed to the wire fixing part 133.

However, in the conventional optical pickup 100, when attaching the suspension wire 140, the suspension wire 140 is inserted into the circular holes 125 and 135, whereby the suspension is inserted into the lens holder 120 and the damper base 130. Since the wire 140 is positioned, as shown in FIGS. 9 and 10, the suspension wire 140 can move freely in the holes 125 and 135, respectively, which causes the suspension wire 140 to be misaligned.

As a result, the lens holder 120 is not supported by the damper base 130 in a well-balanced manner, and the position of the objective lens 110 may deviate from the reference position, and the posture of the objective lens 110 may deviate from the reference posture. is there.

[0014]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical pickup capable of easily, quickly and accurately positioning a suspension wire.

[0015]

This and other objects are achieved by the present invention which is defined below as (1) to (8).

(1) An optical pickup comprising an objective lens, a lens holder supporting the objective lens, and a damper base supporting the lens holder so as to be displaceable via a plurality of suspension wires. The lens holder has a first wire fixing portion to which one end of the suspension wire is fixed, and the damper base includes:
A second wire fixing portion to which the other end of the suspension wire is fixed; and the suspension wire is brought into contact with the first wire fixing portion and the second wire fixing portion, respectively, by contacting the suspension wire. An optical pickup having a corner portion for positioning.

(2) Each of the first wire fixing portion and the second wire fixing portion has a hole or a concave portion into which the suspension wire can be inserted, and the corner portion has an inner surface of the hole. Alternatively, the optical pickup according to the above (1), which is formed on the inner surface of the concave portion.

(3) The optical pickup according to (1) or (2), wherein the suspension wire is pressed against the corner by its own elastic force.

(4) The optical pickup according to any one of (1) to (3), wherein the suspension wire is fixed with a brazing material having conductivity.

(5) The optical pickup according to any one of the above (1) to (4), wherein a pair of suspension wires arranged in parallel in a radial direction of the optical disc are arranged non-parallel.

(6) The optical pickup according to (5), wherein the pair of suspension wires are disposed so as to increase the radial distance of the optical disk from the lens holder to the damper base. .

(7) The optical pickup according to any one of (1) to (6), further comprising a stopper for preventing the suspension wire from moving in a longitudinal direction when the suspension wire is installed.

(8) The optical pickup according to (7), wherein the stopper is provided on the lens holder and abuts on an end of the suspension wire.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical pickup according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of the optical pickup of the present invention, FIG. 2 is a plan view showing a main part of the optical pickup shown in FIG. 1, and FIG. 3 is a lens of the optical pickup shown in FIG. FIG. 4 is a plan view showing the wire fixing portion and its vicinity in the holder, FIG. 4 is a cross-sectional plan view showing the wire fixing portion and its vicinity in the damper base of the optical pickup shown in FIG. 1, and FIG. 5 is AA in FIG. Sectional view with lines,
FIG. 6 is a sectional view taken along line BB in FIG.

As shown in these figures, an optical pickup (optical head) 1 includes a pickup base (optical base) 2, an actuator base 3, a damper base 4, an actuator 5, and four suspension wires (suspension). (Spring) 7.

The pickup base 2 has a space (not shown) for accommodating the lower portions of the actuator base 3 and the damper base 4 at the center thereof, and an optical disk device (for recording an optical disk) at both ends thereof. Guides 28 and 29 are formed to engage guide rods (not shown) installed on the (and / or regenerating device).

The pickup base 2 has guide portions 28 and 29 which are respectively engaged with corresponding guide rods, and are installed along these guide rods so as to be able to reciprocate in the radial direction of the optical disk.

In the present invention, an optical disk is a CD,
CD-ROM, CD-R, CD-RW, DVD, DVD
-ROM, DVD-R, DVD-RAM, DVD-RW
In addition to ordinary optical disks (optical disks in a narrow sense), the concept includes a magneto-optical disk.

The actuator base 3 and the damper base 4 are formed integrally. The integrated body of the actuator base 3 and the damper base 4 is supported by the pickup base 2 with its lower part housed in the space of the pickup base 2.

The actuator 5 is composed of a fixed part 5a and a movable part 5b. The fixing portion 5a is provided with a yoke 51
And a permanent magnet 52 joined thereto, and these are fixedly supported by the actuator base 3.

On the other hand, the movable part 5b of the actuator 5
A lens holder 53 having a lens support 531 and a coil support, and a lens support 531 of the lens holder 53
And a tracking coil 55 and a focusing coil 56 wound around a coil support portion of the lens holder 53. The lens support 531 is formed at the center of the lens holder 53.

The movable part 5b is attached to the damper base 4,
It is displaceably supported via four suspension wires 7. The cross-sectional shape of each suspension wire 7 is circular. In addition, each suspension wire 7
Tracking coil 55 and focusing coil 5
It also functions as an electric wire (conductor) for energizing 6.

By energizing the tracking coil 55,
The objective lens 54 (movable part 5b) moves in the radial direction (tracking direction) of the optical disc, and is energized to the focusing coil 56, so that the objective lens 54 (movable part 5b) is moved.
Is the optical axis direction of the objective lens 54 (focusing direction)
Go to

As shown in FIGS. 1 and 2, one end (left end in FIG. 2) of the suspension wire 7 is fixed to both sides (upper and lower sides in FIG. 2) of the lens holder 53, respectively. Wire fixing part (first wire fixing part) 1
2 are formed two by two (four in total).

The two wire fixing portions 12 formed on one side are located at the center of the side, and
It is arranged on the upper side (upper side in FIG. 1) and lower side (lower side in FIG. 1) of the lens holder 53 (arranged in the optical axis direction of the objective lens 54).

Similarly, the two wire fixing portions 12 formed on the other side portion are located at the center of the side portion, and the upper side (the upper side in FIG. 1) and the lower side of the lens holder 53. (The lower side in FIG. 1).
In the direction of the optical axis).

Each of the wire fixing portions 12 protrudes in the radial direction of the optical disk.

In the vicinity of the left side of each wire fixing portion 12 of the lens holder 53 in FIG. 2, a projection (stopper) 11 for preventing the suspension wire 7 from moving in the longitudinal direction is formed. Each projection 11 is,
It protrudes in the radial direction of the optical disk.

Since the structure of each wire fixing portion 12 is the same, one of them will be representatively described below.

As shown in FIGS. 2 and 3, a hole (through hole) 13 is formed in the wire fixing portion 12. The hole 13 extends in a direction perpendicular to the radial direction of the optical disk and the optical axis of the objective lens 54.

As shown in FIG. 5, the cross-sectional shape of the hole 13 is a square (quadrangle), and the directions of the two diagonal lines are set in the vertical and horizontal directions in FIG.

Of the four corners of the hole 13, the left corner 131 in FIG. 5 is used for positioning the suspension wire 7. That is, the corner 131 abuts against one end of the suspension wire 7, whereby the suspension wire 7 is positioned with respect to the lens holder 53.

As shown in FIGS. 1 and 2, the damper base 4 has a U-shape, and has hollow portions opened to the left in FIG. 2 on both sides (upper and lower sides in FIG. 2). 41 are formed.

The rear ends (right ends in FIG. 2) of both sides (upper and lower sides in FIG. 2) of the damper base 4 are respectively connected to the other ends of the suspension wires 7 (FIG. 2).
Two (two in total) wire fixing portions (second wire fixing portions) 42 for fixing the middle right end portion are formed.

The two wire fixing portions 42 formed at the one rear end portion are located above the damper base 4 (upper in FIG. 1) and lower (see FIG. 1) along the optical axis direction of the objective lens 54. Middle and lower).

Similarly, the two wire fixing portions 42 formed at the other rear end portion are located above and below the damper base 4 (upper side in FIG. 1) along the optical axis direction of the objective lens 54. (Lower side in FIG. 1).

Since the structure of each wire fixing portion 42 is the same, one of them will be representatively described below.

As shown in FIGS. 2 and 4, a hole (through hole) communicating with the hollow portion 41 is formed in the wire fixing portion 42.
43 are formed. The hole 43 extends in a direction perpendicular to the radial direction of the optical disk and the optical axis of the objective lens 54.

As shown in FIG. 2, the radial distance L2 between the hole 43 and the center of the objective lens 54 in the radial direction of the optical disk is the distance L2 between the hole 13 and the center of the objective lens 54 in the radial direction of the optical disk. It is set larger than the distance L1.

As a result, the pair of suspension wires 7, 7 arranged in parallel in the radial direction of the optical disk are non-parallel, that is, the suspension wires 7, 7 are moved from the lens holder 53 to the damper base 4.
, The pair of suspension wires 7, 7 are arranged so as to increase the space in the radial direction of the optical disc (C-shape).

By arranging the suspension wires 7 in a C-shape as described above, the lens holder 5 can be more stably formed.
3 (movable part 5b) can be supported.

In other words, the suspension wire 7 supporting the lens holder 53 extends in the left-right direction in FIG. 2 and passes through the center of the objective lens 54 (shown by a dashed line in FIG. 2) as a rotation center axis. Rigidity (torsional rigidity) in the direction in which 53 is going to rotate (rotational direction)
And the objective lens 5 in that direction of rotation
4 (movable part 5b) and the inclination of the optical axis of the objective lens 54 can be suppressed (or prevented).

If the frequency of the rolling (rolling frequency) and the frequency of the vibration (vibration frequency) generated by the rotation of the spindle (optical disk) of the optical disk drive approach, the actuator 5 may resonate. When the reproduction frequency and the recording speed are increased (the spindle rotation speed is increased), the vibration frequency increases, and when the vibration frequency and the rolling frequency approach each other, the rigidity is increased. By increasing the rolling frequency and increasing the difference between the rolling frequency and the vibration frequency, it is possible to prevent resonance of the actuator 5.

As shown in FIG. 6, the cross-sectional shape of the hole 43 is a square (quadrilateral), and the directions of the two diagonal lines are set in the vertical and horizontal directions in FIG.

Out of the four corners of the hole 43, the left corner 431 in FIG. 6 is used for positioning the suspension wire 7. That is, the corner 431 abuts on the other end of the suspension wire 7, whereby the suspension wire 7 is positioned with respect to the damper base 4.

As shown in FIGS. 1 and 2, on the rear surface (the right end surface in FIG. 2) of the damper base 4, a printed wiring board 9 for energizing each suspension wire 7 is provided.

Each suspension wire 7 is
One end is inserted into the hole 13 of the wire fixing part 12 and the other end is inserted into the hole 43 of the wire fixing part 42, and is fixed with solder (conductive brazing material) 14.

That is, as shown in FIGS. 2 and 3,
One end of each suspension wire 7 is inserted into the hole 13 of the wire fixing part 12 and soldered to the wire fixing part 12 together with the end 57 of the tracking coil 55 or the focusing coil 56.

As shown in FIGS. 2 and 4, the other end of each suspension wire 7 is inserted into the hole 43 of the wire fixing portion 42, and soldered to a predetermined terminal on the printed wiring board 9. Is attached.

A laser diode (light emitting portion) (not shown) for emitting a laser beam for irradiating the optical disc is provided at a predetermined position on the lower side of the actuator base 3 of the pickup base 2 in FIG.

Further, on the lower side of the pickup base 2 in FIG. 1, that is, on the bottom surface 21 of the pickup base 2,
Engaging claws (engaging projections) 22 and 23 for supporting the substrate and a projection 24 are formed, and the substrate 8 is supported by these engaging claws 22, 23 and the projection 24. A photodiode (light receiving element), not shown, for receiving reflected light from the optical disk is mounted on the substrate 8.

At a position corresponding to the photodiode of the pickup base 2, one end communicates with the space in which the lower part of the damper base 4 is housed, and the other end is opened to the bottom surface 21 (not shown). ) Is formed. Light reflected from the optical disk passes through this hole,
The light reaches the light receiving surface of the photodiode.

Next, the operation of the optical pickup 1 will be described. First, a procedure for attaching (installing) the suspension wire 7 will be described.

As shown in FIG. 3, in a state where the tracking coil 55 or the end 57 of the focusing coil 56 is wound around each wire fixing portion 12, each suspension wire 7 is attached to the lens holder 53 and the damper base 4 respectively. Attach to

In this case, as shown in FIG. 2, one end of the suspension wire 7 is inserted into the hole 43 of the wire fixing portion 42 from the rear surface of the damper base 4 and pushed. Thereby, one end side of the suspension wire 7 protrudes from the front surface of the damper base 4 via the hollow portion 41.

Then, one end of the suspension wire 7 is inserted into the hole 13 of the wire fixing portion 12 and pushed. One end of the suspension wire 7 has a protrusion 11
, The suspension wire 7 is prevented from moving in the longitudinal direction. Thereby, the suspension wire 7
In the longitudinal direction. That is, one end of the suspension wire 7 is connected to the hole 13 of the wire fixing portion 12.
And the other end is inserted into the hole 43 of the wire fixing part 42.

As shown in FIGS. 2, 3 and 4, the suspension wire 7 has a corner 131 of the hole 13 of the wire fixing portion 12 and a corner 431 of the hole 43 of the wire fixing portion 42. To the lens holder 53.
And the damper base 4.

In this state, the suspension wire 7 is urged by its own elastic force (restoring force) to cause the side surface 532 of the lens holder 53, the corner 131 of the hole 13 of the wire fixing portion 12, and the wire fixing portion 42. Corner 431 of hole 43 of
And is supported at these three points, thereby being temporarily fixed. Therefore, the operation of attaching the suspension wire 7 can be performed easily, quickly, and reliably.

Then, as shown in FIGS. 2 and 3, one end of each suspension wire 7 is soldered to the wire fixing portion 12 together with the tracking coil 55 or the end 57 of the focusing coil 56, respectively. And as shown in FIG.
Are soldered to predetermined terminals on a printed wiring board 9 installed on the rear surface of the damper base 4 respectively.

With the above, the mounting of each suspension wire 7 is completed, and as shown in FIG. 1 and FIG.
b is displaceably supported by the damper base 4 via four suspension wires 7 in a well-balanced manner.

This optical pickup 1 is mounted on an optical disk device. When recording (writing data) or reproducing (reading data), a laser beam is emitted from the laser diode of the optical pickup 1. The laser light is condensed by the objective lens 54 so as to have a predetermined beam diameter, and is irradiated on a rotating optical disc.

The reflected light from the optical disk is
The light is condensed by the objective lens 54, received by the photodiode, and photoelectrically converted. The signal from the photodiode is input to a predetermined circuit and processed.

As described above, according to the optical pickup 1, since the corners 131 and 431 for positioning the suspension wire 7 are provided, the positioning of the suspension wire 7 is easy when the suspension wire 7 is attached. Can be performed quickly and accurately.

Since the suspension wire 7 can be accurately positioned, the movable portion 5b can be supported by the suspension wire 7 with good balance.

The suspension wire 7 is formed by the elastic force of itself, the side surface 532 of the lens holder 53, the corner 131 of the hole 13 of the wire fixing portion 12, and the corner 431 of the hole 43 of the wire fixing portion 42. And is temporarily fixed by these three points, so that the suspension wire 7 can be easily, quickly and reliably attached.

Thus, the work of assembling the optical pickup 1 can be easily performed. That is, the productivity is good, which is advantageous for mass production.

Next, another configuration example of the wire fixing portions (the first wire fixing portion and the second wire fixing portion) will be described.

The description of the common points with the wire fixing portions 12 and 42 of the optical pickup 1 is omitted.
The main differences will be described.

FIG. 7 is a sectional view showing another example of the configuration of the wire fixing portion in the optical pickup of the present invention.

In the optical pickup 1 described above, the corners 131 and 431 for positioning the suspension wire 7 are provided.
Are formed on the inner surface of the hole 13 and the inner surface of the hole 43, respectively. In the wire fixing portion 15 shown in FIG.
A corner for positioning the suspension wire 7 is formed on the inner surface of the groove (recess) 16.

That is, as shown in FIG. 7, a groove 16 having a V-shaped cross section is formed in the wire fixing portion 15.

When the suspension wire 7 is inserted into the groove 16, the suspension wire 7 comes into pressure contact (contact) with the corner 161, thereby being positioned with respect to the lens holder 53 and the damper base 4.

According to the wire fixing portion 15, the same effects as those of the wire fixing portions 12, 42 of the optical pickup 1 described above can be obtained.

In the optical pickup 1 shown in FIGS. 1 to 6, the torsional rigidity and the rolling frequency were measured by changing the spread angle θ of the suspension wire 7 shown in FIG. FIG. 12 shows the result.

As shown in FIG. 12, when the suspension wires 7 arranged in parallel in the radial direction of the optical disk are non-parallel (θ> 0 deg), they are parallel (θ = 0 de).
It can be seen that the torsional rigidity is higher and the rolling frequency is higher than in g).

When the spread angle θ is increased,
It can be seen that the torsional rigidity increases and the rolling frequency increases.

The optical pickup of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and each component may have any configuration having the same function. Can be replaced by

For example, in the above embodiment, FIG.
6 and 7, the left end is a vertex (pointed), but in the present invention, the end of the corner is not limited to the vertex, and may be, for example, a flat (plane), Further, it may be curved (or may be a curved surface).

In the above embodiment, the upper and lower portions of the corner in FIGS. 5, 6 and 7, that is, the portion of the corner contacting the suspension wire and the vicinity thereof are:
Although it is flat (planar), in the present invention, the portion of the corner portion in contact with the suspension wire and the vicinity thereof are not limited to a flat surface, and may be, for example, curved (or may be curved).

[0091]

As described above, according to the optical pickup of the present invention, when mounting the suspension wire, the positioning of the suspension wire can be performed easily, quickly and accurately.

Since the suspension wire can be accurately positioned, the lens holder can be supported by the suspension wire with good balance.

When a pair of suspension wires arranged in parallel in the radial direction (tracking direction) of the optical disc are arranged non-parallel, particularly, the pair of suspension wires are moved from the lens holder to the damper base. In the case where the optical disk is arranged so that the radial distance between the optical disks increases, the lens holder can be supported more stably.

That is, the rigidity (torsional rigidity) of the suspension wire in the state of supporting the lens holder in the rotation direction of the lens holder is increased, whereby the rolling of the objective lens (lens holder) and the optical axis of the objective lens are reduced. The inclination can be suppressed (or prevented).

Further, for example, by increasing the rotation speed of the spindle (optical disk) of the optical disk device, the frequency of the vibration (vibration frequency) generated by the rotation of the spindle is increased.
Becomes higher, and even if the vibration frequency and the frequency of the rolling (rolling frequency) approach each other, by increasing the rigidity, the rolling frequency is increased, and the difference between the rolling frequency and the vibration frequency is increased. This can prevent problems such as resonance of the actuator.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a main part of the optical pickup shown in FIG.

FIG. 3 is a plan view showing a wire fixing portion and its vicinity in a lens holder of the optical pickup shown in FIG. 1;

4 is a cross-sectional plan view showing a wire fixing portion and its vicinity in a damper base of the optical pickup shown in FIG.

FIG. 5 is a sectional view taken along line AA in FIG. 2;

FIG. 6 is a sectional view taken along line BB in FIG. 2;

FIG. 7 is a cross-sectional view illustrating another configuration example of the wire fixing portion according to the present invention.

FIG. 8 is a plan view showing a main part of a conventional optical pickup.

9 is a sectional view taken along line CC in FIG.

FIG. 10 is a sectional view taken along line DD in FIG. 8;

11 is a schematic diagram (plan view) showing a spread angle θ of a suspension wire of the optical pickup shown in FIG. 1;

12 is a graph showing the relationship between the spread angle θ of the suspension wire 7, the torsional rigidity and the rolling frequency in the optical pickup shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical pickup 2 Pickup base 21 Bottom surface 22, 23 Engagement claw 24 Projection 28, 29 Guide part 3 Actuator base 4 Damper base 41 Hollow part 42 Second wire fixing part 43 Hole part 431 Corner part 5 Actuator 5a Fixing part 5b Movable Part 51 Yoke 52 Permanent magnet 53 Lens holder 531 Lens support part 532 Side surface 54 Objective lens 55 Tracking coil 56 Focusing coil 57 End part 7 Suspension wire 8 Substrate 9 Printed wiring board 11 Projection 12 First wire fixing part 13 Hole 131 Angle Part 14 Solder 15 Wire fixing part 16 Groove 161 Corner part 100 Optical pickup 110 Objective lens 120 Lens holder 121 Wire fixing part 125 Hole part 130 Damper base 133 Wire fixing part 135 Hole part 1 0 suspension wires

 ──────────────────────────────────────────────────の Continuing from the front page (72) Hiroshi Sanbe 5-1010 Tanigawa, Yamagata City, Yamagata Prefecture 5 Yamagata Mitsumi Co., Ltd. Inside the corporation

Claims (8)

[Claims] 1. An optical pickup comprising: an objective lens; a lens holder supporting the objective lens; and a damper base supporting the lens holder so as to be displaceable via a plurality of suspension wires, wherein the lens is The holder has a first wire fixing portion to which one end of the suspension wire is fixed, and the damper base has a second wire fixing portion to which the other end of the suspension wire is fixed, An optical pickup, wherein a corner portion for abutting on the suspension wire and positioning the suspension wire is provided on each of the first wire fixing portion and the second wire fixing portion. 2. The first wire fixing portion and the second wire fixing portion.
2. The light according to claim 1, wherein each of the wire fixing portions has a hole or a recess into which the suspension wire can be inserted, and the corner is formed by an inner surface of the hole or an inner surface of the recess. pick up. 3. The optical pickup according to claim 1, wherein the suspension wire is pressed against the corner by its own elastic force. 4. The optical pickup according to claim 1, wherein the suspension wire is fixed with a brazing material having conductivity. 5. The optical pickup according to claim 1, wherein a pair of suspension wires arranged in parallel in a radial direction of the optical disk are arranged non-parallel. 6. The optical pickup according to claim 5, wherein the pair of suspension wires are arranged so that a distance in a radial direction of the optical disc increases from the lens holder toward the damper base. 7. The optical pickup according to claim 1, further comprising a stopper that prevents a longitudinal movement of the suspension wire when the suspension wire is installed. 8. The optical pickup according to claim 7, wherein the stopper is provided on the lens holder and contacts an end of the suspension wire.