JPH0689445A - Moving device for optical pickup - Google Patents

Abstract

PURPOSE:To simplify a guide mechanism for a moving device, to make the device smaller in size, light in weight and to attain high performance by providing a moving yoke capable of moving through a roller on the fixed yoke of a voice coil motor and fitting a optical pickup on the moving yoke. CONSTITUTION:A moving yoke 22 capable of horizontally moving by means of two abacus bead type rollers 23 guided by a V groove 27 and two flat rollers 24 mounted on a guide surface 28 is provided on the fixed yoke 21 of a voice coil motor 32. An optical pickup 4 is mounted on the yoke 22 and at the time of recording and/or reproducing an optical disk 13, the voice coil 29 of the voice coil motor 32 is energized so as to move the yoke 22. Also, the yoke 22 is stably held on the yoke 21 by means of the attraction force of a magnet plate 31. Consequently, the guide mechanism is simplified, the whole device is made small in size and light in weight and high-speed seeking and high-speed scanning are realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a CD player and a CD-recorder.
The present invention relates to a moving device for an optical pickup, which is optimal for application to a disk device such as a ROM drive.

[0002]

2. Description of the Related Art Conventionally, CD players and CD-ROMs
A moving device for an optical pickup using a voice coil motor applied to a disk device such as a drive is shown in FIG.
And as shown in FIG.

This is a combination of the guide mechanism 1 and the voice coil motor 2 in parallel. Then, an optical pickup 4 having an objective lens 3 is mounted on a slide plate 5, and a total of three rollers 6 mounted on the slide plate 5 and two parallel guide shafts 7 guide the guide mechanism 1
The optical pickup 4 is configured to be moved in the directions of arrows a and b by rolling the roller 6 along both guide shafts 7.

A coil mounting plate 8 extending from the slide plate 5 to one side of one guide shaft 7 is provided, and a voice coil 9 fixed to the coil mounting plate 8 and a magnet parallel to the guide shaft 7. The voice coil motor 2 is configured by the plate 10 and the pair of upper and lower fixed yokes 11, and the magnetic circuit generated between the magnet plate 10 and the fixed yoke 11 when the voice coil 9 is energized slides integrally with the voice coil 9. 5 is driven in the directions of arrows a and b. Reference numeral 12 is a disk table, and 13 is an optical disk such as a CD or a CD-ROM mounted on the disk table 12 and rotated, or an optical disk such as a magneto-optical disk.

[0005]

However, the conventional optical pickup moving device having a structure in which the guide mechanism 1 and the voice coil motor 2 are combined in parallel as in the prior art has a very large overall projected area and is small in size. It is difficult to reduce the weight, the structure is complicated, the number of parts and the number of assembling steps are large, and the cost is extremely high. Particularly, the assembling work of the guide mechanism 1 including the total of three rollers 6 and the two guide shafts 7 is troublesome. Further, if the parallelism between the two guide shafts 7 is incorrect, there is a problem in accuracy such that the optical pickup 4 cannot be moved smoothly. Further, since the inertia of the optical pickup is large, there are various problems such that it is difficult to drive the optical pickup 4 at high speed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a moving device for an optical pickup which can realize a reduction in size, weight, and performance.

[0007]

In order to achieve the above object, a moving device of an optical pickup according to the present invention comprises a fixed yoke, a moving yoke moved by a plurality of rollers on the fixed yoke, and these fixed yokes. A voice coil motor is constituted by a coil and a magnet plate interposed between the moving yoke and the moving yoke, and an optical pickup is mounted on the moving yoke. At this time, the magnet plate is attached to the moving yoke side, the guide rail portions for guiding the plurality of rollers are formed on both left and right sides of the fixed yoke, and the roller on one side of the plurality of rollers is formed. Is formed on the abacus ball-shaped roller, and a V-groove for guiding the abacus ball-shaped roller is provided on the guide rail portion on one side, and a plurality of slide plates are provided between the fixed yoke and the moving yoke. It is preferable that the through holes are provided, and a plurality of rollers are vertically penetrated into these through holes to allow loose fitting.

[0008]

In the optical pickup moving device of the present invention configured as described above, the voice coil motor is provided with the moving yoke which is moved on the fixed yoke through the plurality of rollers.
Since the optical pickup is mounted on the moving yoke, it is possible to eliminate the need for the conventional guide mechanism composed of a total of three rollers and two guide shafts.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical pickup moving device to which the present invention is applied will be described below with reference to FIGS.

First, a first embodiment of a moving device for an optical pickup according to the present invention will be described with reference to FIGS.

On the horizontal fixed yoke 21, a central yoke portion 211 and guide rail portions 212 and 213 on both left and right sides are formed in parallel with each other. Then, the central yoke portion 211 and the left and right guide rail portions 212 and 213.
Are integrally connected at both ends in the length direction (vertical direction in FIG. 2), but they may be integrally formed on one metal plate, or a plurality of metal plates may be mechanically connected. It may have a connected structure.

The horizontal moving yoke 22 is formed to have a length extending between the guide rail portions 212 and 213 on the left and right sides of the fixed yoke. At each end of the moving yoke 22 in the lengthwise direction (horizontal direction in FIG. 2), a pair of abacus ball rollers 23 and a pair of flat roller rollers 24 are provided.
It is rotatably attached by 5, 26.

A V-groove 27 for guiding the pair of abacus ball-shaped rollers 23 is formed on the upper surface of the guide rail portion 212 on one side of the fixed yoke 21, and the guide rail portion 213 on the other side of the fixed yoke 21 is formed. A flat guide surface 28 for guiding the pair of flat rollers 24 is formed on the upper surface. Therefore, the fixed yoke 21 also serves as the guide rail of the moving yoke 22.

A flat and horizontal voice coil 29 is fitted on the outer periphery of the central yoke portion 211 of the fixed yoke 21 by a voice coil bobbin 30.

A horizontal magnet plate 31 is horizontally adhered to the center of the lower surface of the moving yoke 22 and is arranged close to the upper portion of the voice coil 29.

The fixed yoke 21 and the movable yoke 2
2, the voice coil 29 and the magnet plate 31 constitute a voice coil motor 32.

The optical pickup 4 having the objective lens 3 is directly attached to the upper portion of the moving yoke 22 of the voice coil motor 32 so as to face upward.

The voice coil motor 32 may be arranged upside down so that the voice coil 29 is attached to the moving yoke 22 side and the magnet plate 31 is attached to the fixed yoke 21 side.

Next, in the optical pickup moving device of the present invention configured as described above, the moving yoke 22 on which the optical pickup 4 is attached is fixed to the fixed yoke 2.
Place it on top of 1 and put a total of four rollers 23, 24 in the V groove 2.
7 and the guide surface 28 can be assembled very simply by a one-touch operation of fitting and mounting.

Then, the assembled moving yoke 22 is
The fixed yoke 21 is generated by the magnetic attraction force of the magnet plate 31.
It is stably held on the top and the moving yoke 22 has a total of 4
The two rollers 23 and 24 enable horizontal movement on the fixed yoke 21 in the directions of arrows a and b. At this time, the pair of abacus ball-shaped rollers 23 on one side are guided by the V groove 27, so that the moving loci of the moving yoke 22 in the directions of the arrows a and b are set with high accuracy.

When recording and / or reproducing the optical disk 13 mounted horizontally on the disk table 12, the moving coil 22, the magnet plate 31, and the fixed yoke are energized by energizing the voice coil 29 of the voice coil motor 32. The moving yoke 22 is driven integrally with the magnet plate 31 in the directions of arrows a and b by the magnetic circuit generated between the central yoke portions 211 of the moving yoke 22.
A pair of left and right guide rail portions 212 of the fixed yoke 21,
A total of four rollers 23, 24 on arrow 213 indicate arrow a,
The optical pickup 4 is moved along the lower part of the optical disk 13 so that the optical pickup 4 is smoothly moved in the direction b.
Drive in the direction.

In the optical pickup moving device of the present invention constructed as described above, the guide mechanism 1 of the conventional optical pickup moving device shown in FIGS. 5 and 6 can be dispensed with. The projected area of the entire moving device can be made very small, and the size and weight can be greatly reduced. And the optical pickup 4
Since the inertia can be reduced, the optical pickup 4 can be driven at high speed in the directions of the arrows a and b, so that high-speed seek and high-speed scanning of the optical disk 13 by the optical pickup 4 can be realized.

Moreover, the pair of abacus ball-shaped rollers 23 are V-shaped.
Since the groove 27 is guided with high precision, the optical pickup 4
Can be moved in the directions of arrows a and b with high precision, and a high-performance optical pickup moving device can be realized.

Next, a second embodiment of the moving device for the optical pickup according to the present invention will be described with reference to FIGS.

In this case, a substantially rectangular slide plate 34 is horizontally interposed between the fixed yoke 21 and the movable yoke 22. Then, a plurality of through holes 35, 36 are formed on both left and right sides of the slide plate 34, and a plurality of ball type rollers 37 and flat type rollers 38 are respectively formed through the through holes 35,
It is freely rotatably fitted in 36. Then, a pair of upper and lower V grooves 39 and 40 for guiding the pair of ball type rollers 37 are formed on the upper surface of one guide rail portion 212 of the fixed yoke 21 and the lower surface of one side portion of the moving yoke 22 facing the guide rail portion 212. is doing. Further, the upper surface of the other guide rail portion 213 of the fixed yoke 21 and the movable yoke 2 facing the upper surface of the guide rail portion 213.
Flat guide surfaces 41 and 42 for guiding the pair of flat rollers 38 are formed on the lower surface of the other side portion 2.

According to the second embodiment, a total of four rollers 37, 38 need only be loosely fitted in the through holes 35, 36 of the slide plate 34, and as in the first embodiment described above, a total of four rollers 37, 38 are required. Since it is not necessary to pivotally support the four rollers 23 and 24 on the moving yoke 22 by the support shafts 25 and 26, there is a feature that the assembly can be further simplified.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made based on the technical idea of the present invention.

[0028]

The optical pickup moving device of the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, a voice coil motor is provided with a moving yoke which is moved on a fixed yoke through a plurality of rollers, and an optical pickup is mounted on the moving yoke, so that a total of three conventional rollers and two rollers are provided. Since the guide mechanism that is composed of the guide shaft of the book can be eliminated, the projected area of the entire optical pickup moving device can be made very small, and a small and lightweight optical pickup moving device can be provided. realizable.

According to the present invention, since the conventional guide mechanism can be eliminated, the structure is simple, the number of parts and the number of assembling steps can be greatly reduced, and the cost can be greatly reduced.

Since the optical pickup is moved by the moving yoke, the inertia of the optical pickup can be made very small and the optical pickup can be driven at high speed.

According to the present invention, the magnet plate of the voice coil motor is attached to the moving yoke side, and the moving yoke can be attracted and held on the fixed yoke by utilizing the magnetic attraction force of the magnet plate. With a one-touch operation of simply placing the moving yoke on the fixed yoke,
Assembly can be completed and assembly and disassembly is extremely simple.

According to a third aspect of the present invention, since a pair of left and right guide rails for guiding the plurality of rollers of the moving yoke are formed on both left and right sides of the fixed yoke, the structure can be simplified.

According to the present invention, the roller on one side of the plurality of rollers is formed on the abacus ball type roller, and the V groove for guiding the abacus ball type roller is formed on the guide rail portion on the one side. , The optical head can be moved with high precision without rattling, and the abacus ball type roller can be easily
It is very easy to assemble because it only needs to be fitted in the groove.

According to a fifth aspect of the present invention, the slide plate interposed between the fixed yoke and the movable yoke is provided with a plurality of through holes, and a plurality of rollers are loosely fitted in the through holes, so that the assembly is very easy. Is.

[Brief description of drawings]

FIG. 1 is a sectional front view taken along the line AA of FIG. 2 showing a first embodiment of a moving device of an optical pickup of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional front view taken along the line BB of FIG. 4 showing a second embodiment of the optical pickup moving device of the present invention.

FIG. 4 is a plan view taken along the line C-C of FIG.

FIG. 5 is a view showing a moving device of a conventional optical pickup.
FIG. 7 is a sectional front view taken along the line DD of FIG.

FIG. 6 is a plan view of FIG.

[Explanation of symbols]

 4 Optical pickup 13 Optical disk 21 Fixed yoke 211 Central yoke part 212 of fixed yoke 212, 213 Guide rail part of fixed yoke 23 Abacus ball type roller 24 Flat type roller 27 V groove 29 Voice coil 31 Magnet plate 32 Voice coil motor 34 Slide plate 35, 36 Through hole 37 Ball type roller 38 Flat type roller 39, 40 V groove

Claims (5)

[Claims] 1. A voice coil motor comprises a fixed yoke, a moving yoke moved by a plurality of rollers on the fixed yoke, and a coil and a magnet plate interposed between the fixed yoke and the moving yoke. An optical pickup moving device characterized in that an optical pickup is mounted on the moving yoke. 2. A moving device for an optical pickup according to claim 1, wherein the magnet plate is attached to the moving yoke side. 3. A moving device for an optical pickup according to claim 1, wherein guide rail portions for guiding the plurality of rollers are formed on both right and left sides of the fixed yoke. 4. A roller on one side of the plurality of rollers is formed in a abacus ball-shaped roller, and a guide groove on the one side is provided with a V groove for guiding the roller of the abacus ball. The optical pickup moving device according to claim 3, wherein 5. A slide plate interposed between the fixed yoke and the movable yoke is provided with a plurality of through holes, and a plurality of rollers are vertically penetrated into these through holes to be loosely fitted. The optical pickup moving device according to claim 1.