JPH09185829A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device capable of stabely absorbing vibration of suspension springs by vibration absorbing material. SOLUTION: This device includes a lens holder 12 holding an objective lens 11, a focusing coil wound on a coil winding part of the lens holder 12 and a tracking coil, suspension springs 14 which supports the lens holder 12 movable in a focusing direction and a tracking direction with respect to a fixedly arranged damper base 13, and the suspension springs 14 are fixed so as to be in contact with a vibration absorbing material 17 in recessed parts 13a and 13b provided on the surface of the damper base. In this case, an optical pickup device 10 is made up so that a cover 18 to cover, at least, the suspension spring fixing areas and the recessed parts 13a and 13b of the damper space 13 is provided.

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 FIG. That is,
In FIG. 3, an optical pickup device 1 includes an objective lens 2
A lens holder 3 for holding the lens holder 3, a focusing coil 3a and a tracking coil 3b wound around a coil winding portion provided on the lens holder 3, and a damper base 4 on which the lens holder 3 is fixedly arranged. And a suspension spring 5 movably supporting the focusing direction F and the tracking direction T.

In the illustrated case, the suspension springs 5 are provided on both sides of the lens holder 3 so as to connect the upper surface of the lens holder 3 and the upper surface of the damper base 4, respectively. A suspension spring that connects the lower surfaces of both sides and the lower surface of the damper base 4 is also provided, and a total of four suspension springs 5 are arranged in two pairs. As a result, the lens holder 3 can be translated in the focusing direction F and the tracking direction T without tilting.

Further, winding ends of the focusing coil 3a and the tracking coil 3b are connected to terminals 3c and 3d provided on the lens holder 3 and the like. Then, one end of the suspension spring 5 is mechanically fixed and electrically connected to the terminals 3c and 3d by soldering.

On the other hand, the suspension spring 5 is
The other end has a protrusion 4 protruding from the upper surface of the damper base 4.
The parts of the projections 4a and 4b closer to the lens holder 3 are fitted into the a and 4b, and the vibration absorbing material 8 is injected into the recessed parts 4c and 4d provided on the upper surface of the damper base 4, for example, ultraviolet curing. Vibration can be suppressed by contacting with a vibration absorbing material made of silicone gel made of mold resin.

Further, a yoke 6 is fixedly arranged on the damper base 4. This yoke 6 has a U-shape when viewed from the side and has two end portions 6a,
6b are arranged so as to sandwich the lens holder 3 at intervals from the horizontal direction perpendicular to the tracking direction. Further, the lens holder 3 of the end portions 6a, 6b
Magnets 7a and 7b are provided on the inner surface opposed to.

According to the optical pickup device 1 configured as described above, the winding of each coil wound around the coil winding portion of the lens holder 3 has the suspension spring 5 respectively.
Via an external drive voltage supply source. As a result, a driving voltage is externally supplied 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 formed by the yoke 6 and the magnets 7a and 7b. Further, 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 coils 3a and 3b. Thus, the objective lens 2 attached to the lens holder 3
However, it can be appropriately moved with respect to the focusing direction F and the tracking direction T.

[0008]

However, when fixing the other end of the suspension spring 5 to the damper base 4, when the vibration absorbing material is injected into the recessed portions 4c and 4d, the amount of the vibration absorbing material is too large. As a result, the vibration absorbing material may overflow and the vibration absorbing effect may become unstable, and the vibration absorbing material may rise from the surface of the damper base 4 by the thickness of the suspension spring 5. Since the silicone gel is in a semi-cured state, there is a problem that the vibration absorbing effect is reduced.

In view of the above points, an object of the present invention is to provide an optical pickup device in which vibration of a suspension spring can be stably performed by a vibration absorbing material.

[0010]

According to the present invention, there is provided 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. A suspension spring for movably supporting the lens holder in a focusing direction and a tracking direction with respect to a damper base fixedly arranged, wherein the suspension spring is a vibration absorbing material in a concave portion provided on the surface of the damper base. The optical pickup device, which is fixed so as to be in contact with, is provided with a cover that covers at least the suspension spring attachment region and the recessed portion of the damper base. It

In the optical pickup device according to the present invention, preferably, the cover is made of a resin having an ultraviolet ray transmitting property.

The optical pickup device according to the present invention is preferably mounted by sliding the cover from the side opposite to the lens holder with respect to the damper base.

According to the above structure, one end of the suspension spring is covered with the cover, so that the vibration absorbing member in the recessed portion provided in the damper base can be surely brought into contact with the cover. It can be prevented from coming out and the vibration absorbing effect is not deteriorated.

Further, since the vibration absorbing material is injected into the space defined by the concave portion and the cover, the injection amount of the vibration absorbing material becomes uniform and a sufficient and stable vibration absorbing effect can be obtained. Become.

When the cover is made of a resin having an ultraviolet ray transmitting property, even if the cover is present, the ultraviolet ray curing resin constituting the vibration absorbing material is cured by irradiating the cover with ultraviolet rays. Can be done.

When the cover is attached by sliding on the damper base from the side opposite to the lens holder, the cover can be easily attached to the damper base.

[0017]

FIG. 1 shows an embodiment of an optical pickup device according to the present invention. That is, in FIG. 1, 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. A suspension spring 14 that supports the lens holder 12 so as to be movable in a focusing direction F and a tracking direction T with respect to a damper base 13 that is fixedly arranged.

In the illustrated case, the suspension springs 14 connect the upper surface of the lens holder 12 and the upper surface of the damper base 13 on both sides of the lens holder 12, respectively.
Although provided, suspension springs that connect the lower surfaces on both sides of the lens holder 12 and the lower surface of the damper base 13 are also provided, and a total of two pairs of suspension springs 14 are provided. ing. As a result, the lens holder 12 can be translated in the focusing direction F and the tracking direction T without tilting.

Further, the focusing coil 12a is used.
And the tracking coil 12b has
The lens holder 12 is connected to terminals 12c, 12d and the like. Then, one end of the suspension spring 14 is connected to the terminals 12c and 12d of the lens holder 12,
It is mechanically fixed and electrically connected by soldering.

On the other hand, the suspension spring 1
4 has its other end fitted to a protrusion (which has the same structure as the protrusions 4a and 4b in FIG. 3, but is not shown) protruding on the upper surface of the damper base 13, and is located closer to the lens holder 12 than these protrusions. A part of the vibration absorbing material 1 is injected into the concave portions 13a and 13b provided on the upper surface of the damper base 13.
7, for example, by contacting with a vibration absorbing material made of a silicone gel made of an ultraviolet curable resin, the vibration can be damped.

A yoke 15 is fixedly arranged on the damper base 13. This yoke 15 has a U-shape when viewed from the side and has two end portions 1
5a and 15b are arranged so as to sandwich the lens holder 12 at intervals from the horizontal direction perpendicular to the tracking direction. Further, on the inner surfaces of the end portions 15a and 15b facing the lens holder 12, a magnet 16 is provided.
a and 16b are provided.

The above-mentioned structure is the same as that of the conventional optical pickup device 1 shown in FIGS. 3 and 4, but in the optical pickup device 10 according to the embodiment of the present invention, at least the suspension spring 14 of the damper base 13 is provided.
With respect to the mounting area, the periphery thereof, that is, both side surfaces, the upper surface, and the lower surface are covered with the cover 18.

The cover 18 is made of, for example, a resin having an ultraviolet ray transmitting property, and is preferably attached to the damper base 13 by sliding it from the direction shown by the arrow A in FIG. There is. As a result, even if the cover 18 is present,
The ultraviolet curable resin forming the vibration absorbing material 17 can be surely cured, and the assembly can be easily performed.

The optical pickup device 10 according to the present invention is
It is configured as described above, and at the time of assembly, the suspension spring 14 is fitted to the protrusion provided in the suspension spring mounting region of the damper base, and the cover 1
2 is attached to the damper base 13 by sliding in the direction of arrow A in FIG.

From this state, after the vibration absorbing material 17 made of an ultraviolet curable resin is injected into the concave portions 13a and 13b of the damper base 13, the vibration absorbing material 17 is irradiated by ultraviolet rays from above the cover 18. Is cured.

According to the optical pickup device 10 assembled in this way, the windings of the coils 12a and 12b wound around the coil winding portion of the lens holder 12 are externally connected via the suspension springs 14, respectively. Connected to the drive voltage supply source. As a result, the driving voltage is supplied to the coils 12a and 12b from the outside,
A magnetic field is generated in the focusing coil 12a or the tracking coil 12b. And each coil 12
The magnetic flux generated by a and 12b is generated by the yoke 15 and the magnet 1.
6a, 16b and the coils 12a, 12
By interacting with the magnetic flux passing through b, forces in the focusing direction F and the tracking direction T act on the lens holder 12. 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 other end is fitted to the protrusion in the suspension spring mounting region of the damper base 13, and the portion on the lens holder 12 side is fitted to the vibration absorbing material 17 in the recessed portions 13a and 13b provided in the damper base 13. Although they are in contact with each other, the contact with the vibration absorbing material 17 can be surely performed due to the presence of the cover 18, so that the vibration absorbing effect is not impaired and a sufficient vibration absorbing effect can be secured.

Further, when the vibration absorbing material 17 is poured into the recessed portions 13a and 13b, since the recessed portions 13a and 13b are closed by the cover 18, the vibration absorbing material 17 is removed from the recessed portions 13a and 13b. Never overflows,
Since a stable injection amount that is approximately equal to the volume of the concave portions 13a and 13b is secured, the vibration absorbing effect of the vibration absorbing material 17 can be stabilized.

In the above embodiment, the suspension spring 14 is fixed to the damper base 13 by fitting the other end to the protrusion of the suspension spring mounting portion of the damper base 13, but this is not the case. The suspension spring 14 is not limited to this, and it is clear that one end thereof may be fixed to the damper base 13 and may be fixed to the damper base 13 by various other fixing methods.

Further, in the above embodiment, the cover 1
8 is composed of two left and right parts so as to cover only the attachment regions of the left and right suspension springs 14 of the damper base 13, respectively, but it is also possible that they are integrally formed so as to cover the entire damper base 13. Is clear.

[0031]

As described above, according to the present invention, since one end of the suspension spring is covered with the cover, the suspension spring can be reliably brought into contact with the vibration absorbing material in the recessed portion provided in the damper base. In addition, the vibration absorbing material can be prevented from overflowing by the cover, and the vibration absorbing effect does not deteriorate.

Further, since the vibration absorbing material is injected into the space defined by the concave portion and the cover, the injection amount of the vibration absorbing material becomes uniform and a sufficient and stable vibration absorbing effect can be obtained. Become.

Thus, according to the present invention, it is possible to provide an optical pickup device in which the vibration of the suspension spring can be stably absorbed by the vibration absorbing material.

[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 schematic perspective view showing a main part of the optical pickup device of FIG.

FIG. 3 is a schematic perspective view showing an example of a conventional optical pickup device.

FIG. 4 is a schematic perspective view showing a main part of 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 12c, 12d Terminal 13 Damper Base 13a, 13b Recess 14 Suspension Spring 15 Yoke 15a, 15b End 16a, 16b Magnet 17 Vibration Absorbing Material 18 Cover

Claims (3)

[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. And a suspension spring movably supported in the tracking direction, the suspension spring being fixed so as to come into contact with the vibration absorbing material in the recessed portion provided on the surface of the damper base. An optical pickup device, comprising: a cover for covering at least a suspension spring mounting region and a recess of the damper base. 2. The optical pickup device according to claim 1, wherein the cover is made of a resin having an ultraviolet ray transmitting property. 3. The cover slides on the damper base from the side opposite to the lens holder,
The optical pickup device according to claim 1, wherein the optical pickup device is attached.