JP2003187473A - Optical pickup device and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device and an optical disk device which can adjust variation in precision and assembling of parts and improve optical characteristics. <P>SOLUTION: The optical pickup device is provided with an actuator 29 which supports an objective lens slightly movable to an optical disk and a carriage 30 which has the actuator 20 on board and moves in the direction of the radius of the optical disk. Characteristically, the actuator 29 is provided with a projection 31 having a spherical surface, and the carriage 30 is provided with a V-shaped groove 32 receiving a projection 32. The optical disk device is characterized in that it has this optical pickup device on board. <P>COPYRIGHT: (C)2003,JPO

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 capable of easily absorbing variations in parts accuracy and assembly and improving optical characteristics, and an optical desk device equipped with the same.

[0002]

2. Description of the Related Art A conventional optical pickup device will be described. FIG. 3 is an exploded view of a conventional optical pickup device. As shown in FIG. 3, the lens holder 1 holds an objective lens 2, a focus coil 3 and a tracking coil 4. The lens holder 1 is cantilevered by a suspension holder 6 by four suspension wires 5, and the suspension holder 6 is further fixed to a yoke 7. A magnet 8 is fixed to the yoke 7, and the suspension holder 6 is fixed to the yoke 7 so that the focus coil 3 and the tracking coil 4 are located between the magnet 8 and the yoke 7. The four suspension wires 5 are fixed to the suspension holder 6 arranged in this way, and the other end supports the lens holder 1. The actuator 9 of the optical pickup device is
It has the configuration described above and is mounted on the carriage 10.

By the way, the conventional actuator 9 is provided with a spherical projection 11 centered on the objective lens 2 on the lower surface for mounting on the carriage 10. On the other hand, on the carriage 10, a spherical surface 12 provided on the actuator 9 is formed so that the projection 11 is spherically supported. Although the optical axis and the mounting position are not shown accurately in FIG. 3, the semiconductor laser 13 emits a laser beam for writing and reading data, and the laser beam changes its direction by the mirror 14 and the objective lens. The light is focused at 2 and focused on the information recording layer of the optical disc. The optical pickup device includes an actuator 9, an optical system such as a semiconductor laser 13 and a mirror 14, and an optical detection system, and is mounted on a carriage 10 by a protrusion 11 and a spherical surface 12.

In the conventional optical pickup device, the spherical surface 12 in which the carriage 10 supports the actuator 9 is used so that the objective lens 2 is perpendicular to the optical axis of the laser light, and the radial direction is changed. Adjusting the tilt in the tangential direction. Actuator 9
Since the spherical surface 12 is used for supporting, the direction can be freely changed in either the radial direction or the tangential direction.

[0005]

In the optical pickup device, it is very important in terms of optical characteristics to match the relative position and relative angle of the objective lens and the laser light. The relative position and the relative angle of the objective lens 2 in the actuator 9 vary depending on the accuracy of each component and the assembly accuracy of the actuator 9, so that the position of the objective lens 2 with respect to the carriage 10 varies. Due to this variation, the relative position and relative angle between the objective lens 2 and the laser light vary, which is a major cause of deterioration in optical characteristics.

Therefore, in the conventional optical pickup described above, the actuator 9 is provided with the convex spherical projection 11 centered on the objective lens 2 and the carriage 10 is provided with the concave spherical surface 12 to rotate the spherical surface. Then, the relative angle of the objective lens 2 was adjusted.

However, the actuator 9 and the carriage 1
Since both 0 are spherical surfaces, the assembly position is fixed at the center of the spherical surface, so movement is restricted and relative movement cannot be performed. Therefore, it has been impossible to adjust the relative position of the optical pickup device by absorbing variations in parts accuracy and assembly.

Therefore, an object of the present invention is to provide an optical pickup device capable of absorbing variations in parts accuracy and assembly, adjusting the relative position of the objective lens with respect to the carriage, and improving the optical characteristics. And

Another object of the present invention is to provide an optical disk device capable of absorbing variations in parts accuracy and assembly, adjusting the relative position of the objective lens with respect to the carriage, and improving the optical characteristics. To do.

[0010]

In order to solve the above problems, in the optical pickup device of the present invention, a spherical projection is formed on the actuator, and the carriage has a V-shaped cross section for receiving the projection. It is characterized in that a groove is provided.

As a result, it is possible to absorb variations in component precision and assembly, adjust the relative position of the objective lens with respect to the carriage, and improve the optical characteristics.

Further, the optical disk device of the present invention is characterized by mounting the above-mentioned optical pickup device.

As a result, it is possible to absorb variations in parts precision and assembly, adjust the relative position of the objective lens with respect to the carriage, and provide an optical disk device with improved optical characteristics.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is an optical pickup device for irradiating an optical disc with light from an objective lens and reproducing information of the optical disc from the reflected light, wherein the objective lens is an optical disc. An actuator that supports the actuator so that it can be moved minutely and a carriage that mounts the actuator and moves in the radial direction of the optical disk are provided. The actuator has a spherical projection and the carriage receives the projection. Since the optical pickup device is characterized in that the groove having the V-shaped cross section is provided, the actuator can be moved along the groove having the V-shaped cross section, and variations in component accuracy and assembly can be absorbed, and the objective lens can be absorbed. The optical characteristics can be improved by adjusting the relative position of the carriage to the carriage.

The invention according to claim 2 of the present invention is the optical pickup device according to claim 1 characterized in that the groove is provided in the tracking direction of the optical disk, and therefore, in the radial direction of the optical disk. It is possible to move and absorb variations in parts accuracy and assembly.

According to a third aspect of the present invention, the groove is provided in the tangential direction of the optical disc. Therefore, the optical pickup device according to the first aspect is characterized in that the tangential direction of the optical disc is obtained. It is possible to move to, and it is possible to absorb variations in parts accuracy and assembly.

The invention according to claim 4 of the present invention is an optical disk device for mounting and rotating an optical disk, irradiating the optical disk with light, and reproducing and recording the information of the medium from the reflected light. Since the optical disc device is equipped with the optical pickup device according to any one of 1 to 3, it absorbs variations in component precision and assembly,
Adjust the relative position of the objective lens with respect to the carriage,
Optical characteristics can be improved.

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

(Embodiment 1) FIG. 1 is an exploded view of an optical pickup device according to Embodiment 1 of the present invention. Figure 1
In, the main configuration is the same as that of the optical pickup described in the related art. In FIG. 1, the lens holder 21
The objective lens 22, the focus coil 23, and the tracking coil 24 are held in. The lens holder 21 is cantilevered by a suspension holder 26 by four suspension wires 25, and the suspension holder 26 is further fixed to a yoke 27. A magnet 28 is fixed to the yoke 27, and the focus coil 23 and the tracking coil 24 are connected to the magnet 2.
8 and the yoke 27, the suspension holder 26 is fixed to the yoke 27. The four suspension wires 25 are fixed to the suspension holder 26 arranged in this way, and the other end supports the lens holder 21. Actuator 29 of optical pickup device
With the configuration described above, the objective lens 22 is movably supported with respect to the optical disc, and the objective lens 22 is mounted on the carriage 30 and can be moved in the radial direction of the optical disc.

By the way, the actuator 29 of the first embodiment is provided with a spherical projection 31 centered on the objective lens 22 on the lower surface for mounting on the carriage 30. On the other hand, a V-shaped groove 32 having a V-shaped cross section is formed in the carriage 10, and the V-shaped groove 32 is provided in the radial direction, that is, in the tracking direction of the optical disc. The V-shape is a shape that includes not only a V-shape but also a substantially V-shape formed of a tapered surface and a flat bottom. Any shape is acceptable as long as it can slide in the tracking direction and rotate in two directions, the radial direction and the tangential direction. Although the optical axis and the mounting position are not shown accurately in FIG. 1, the semiconductor laser 33 emits a laser beam for writing and reading data, and the laser beam changes its direction by a mirror 34 and the objective lens. The light is focused at 22 and focused on the information recording layer of the optical disc. The optical pickup device includes an actuator 29 to which an optical system such as a semiconductor laser 33 and a mirror 34 and an optical detection system are added, and the carriage 3
0 is mounted with a protrusion 31 and a V-shaped groove 32, and an optical disc is irradiated with laser light, and an optical detection system reproduces information from the reflected light.

Now, in the optical pickup device of the first embodiment, the objective lens 22 is arranged with respect to the optical axis of the laser light.
By using the V-shaped groove 32 in which the carriage 30 supports the actuator 29, the tilt adjustment in the radial direction and the tangential direction can be performed so that the vertical direction is vertical. That is, when the spherical projection 31 is moved along the V-shaped groove 32, it can be moved in the radial direction, and the spherical projection 31 is received and supported between the tapered surfaces of the V-shaped groove 32. By the rotation, the angle adjustment can be performed in the radial direction and the tangential direction, the position adjustment and the angle adjustment of the actuator 29 can be realized, and the radial direction between the objective lens 22 and the optical axis of the laser beam generated due to assembly variation or the like can be realized. The position shift can be adjusted.

Although not shown, an optical disk device is configured by mounting the optical pickup device of the first embodiment,
An optical disc is mounted and driven to rotate, laser light is emitted from the objective lens 22 of the optical pickup device to the optical disc, and the reflected light is detected by the reflected light detection system of the optical pickup device to reproduce or reproduce information on the optical disc. When recording is performed by irradiating stronger laser light, it is possible to provide an optical disc device having excellent optical characteristics in which the positional deviation in the radial direction between the objective lens 22 and the optical axis of the laser light caused by assembly variation or the like is adjusted. .

(Second Embodiment) FIG. 2 is an exploded view of an optical pickup device according to a second embodiment of the present invention. Figure 2
In, the main configuration is the same as that of the optical pickup device described in the first embodiment of the present invention. Detailed description will be omitted by giving it to the first embodiment.

The lens holder 21 holds the objective lens 22, the focus coil 23, and the tracking coil 24, and is cantilevered by a suspension holder 26 by four suspension wires 25, and the suspension holder 26 is fixed to a yoke 27. . A magnet 28 is fixed to the yoke 27. The actuator 29 has the configuration described above, and the objective lens 22
Is movably supported on the optical disc, and is mounted on the carriage 30 so that it can be moved in the radial direction of the optical disc.

By the way, the actuator 29 of the second embodiment is provided with a spherical projection 31 centered on the objective lens 22 on the lower surface for mounting on the carriage 30, and the carriage 10 has a cross section of V-shape. V-shaped groove 3
5 is formed, and the V-shaped groove 35 is provided in the tangential direction. The V-shape is a shape that includes a substantially V-shape, as in the first embodiment. Any shape may be used as long as it can slide in the tangential direction and rotate in two directions, the radial direction and the tangential direction. The semiconductor laser 33 emits laser light for writing and reproducing data, and the laser light changes its direction by the mirror 34 and is condensed by the objective lens 22.
The focus is on the information recording layer of the optical disc. In the optical pickup device, an optical system such as a semiconductor laser 33 and a mirror 34 and an optical detection system are added to an actuator 29, and a carriage 31 is mounted with a protrusion 31 and a V-shaped groove 35.

Now, in the optical pickup device of the second embodiment, the objective lens 22 is arranged with respect to the optical axis of the laser light.
By using the V-shaped groove 35 in which the carriage 30 supports the actuator 29, the tilt adjustment can be performed in the radial direction and the tangential direction. That is, the spherical projection 31 is formed into the V-shaped groove 3
Moving along 5 allows movement in the tangential direction, and since the spherical projection 31 is received and supported between the tapered surfaces of the V-shaped groove 35, it is rotated to move in the radial direction and the tangential direction. The angle can be adjusted, and the position of the actuator 29 in the tangential direction can be adjusted.
The angle adjustment can be realized, and the positional deviation in the tangential direction between the objective lens 22 and the optical axis of the laser light, which is generated due to assembly variation or the like, can be adjusted.

Although not shown, an optical disc device is configured by mounting the optical pickup device of the second embodiment,
An optical disc is mounted and driven to rotate, laser light is emitted from the objective lens 22 of the optical pickup device to the optical disc, and the reflected light is detected by the reflected light detection system of the optical pickup device to reproduce or reproduce information on the optical disc. By irradiating and recording with a stronger laser beam, it is possible to provide an optical disk device having excellent optical characteristics in which the positional deviation in the tangential direction between the objective lens 22 and the optical axis of the laser beam caused by assembly variations or the like is adjusted. it can.

[0028]

As described above, according to the optical pickup device of the present invention, the actuator can be moved along the groove having the V-shaped cross section, the precision of the parts and the variation of the assembly can be absorbed and the objective lens The optical characteristics can be improved by adjusting the relative position with respect to the carriage.

According to the optical disk device of the present invention,
It is possible to provide an optical disc device that absorbs variations in component accuracy and assembly and adjusts the relative position of the objective lens with respect to the carriage to improve optical characteristics.

[Brief description of drawings]

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

FIG. 2 is an exploded view of an optical pickup device according to a second embodiment of the present invention.

FIG. 3 is an exploded view of a conventional optical pickup device

[Explanation of symbols]

1,21 Lens holder 2,22 Objective lens 3,23 Focus coil 4,24 Tracking coil 5,25 suspension wire 6,26 Suspension holder 7,27 York 8,28 magnet 9,29 actuator 10,30 Carriage 11,31 Protrusion 12 spherical surface 13,33 Semiconductor laser 14,34 mirror 32,35 V-shaped groove

Claims (4)

[Claims] 1. An optical pickup device for irradiating an optical disc with light from an objective lens and reproducing the information of the optical disc from the reflected light, wherein the actuator supports the objective lens so that the objective lens can be moved minutely with respect to the optical disc. A carriage having the actuator mounted thereon and moving in the radial direction of the optical disk, wherein the actuator is formed with a spherical projection, and the carriage is provided with a groove having a V-shaped cross section for receiving the projection. An optical pickup device characterized by being provided. 2. The optical pickup device according to claim 1, wherein the groove is provided in a tracking direction of the optical disk. 3. The optical pickup device according to claim 1, wherein the groove is provided in the tangential direction of the optical disk. 4. An optical disk device according to any one of claims 1 to 3, which is an optical disk device in which an optical disk is mounted and rotationally driven to irradiate the optical disk with light to reproduce and record information on the medium from reflected light. An optical disc device comprising an optical pickup device.