JP2837739B2 - Optical disk pickup drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an optical disc having a pickup for reading a signal of an optical disc on which an optical signal is recorded, and for moving the pickup in a radial direction of the optical disc. And a pickup driving device.

[Conventional technology]

FIG. 4 shows a conventional pickup driving device for an optical disk of this kind.

In this optical disk pickup driving device, two guide rails 2 and 3 having a circular cross section are fixed on a chassis 1.

On the slider 5 on which the pickup 4 is mounted, two pairings 6 with V-grooves that move along the guide rail 2 move along the guide rail 3 and are pressed against the guide rail 3 by the urging force of the spring 7. V-groove bearing 8 is attached.

A coil 10 that fits loosely on a magnet 9 fixed to the chassis 1 and forms a linear motor with the magnet 9 is fixed to the slider 5.

The slider 5 is provided with a V-groove bearing by a driving force generated between a current flowing through the coil 10 and the magnet 9.
The pickups 6 and 7 roll on the guide rails 2 and 3 to move the pickup 4 in the radial direction with respect to the optical disk placed and fixed on the turntable 11.

[Problems to be solved by the invention]

In such an optical disk pickup driving device, the parallelism and bending of the two guide rails 2 and 3 in the height direction have a large effect on the inclination of the optical axis of the pickup 4, so that the assembling accuracy Is required.

Also, the V-grooves of the bearings 6 and 8 with V-grooves are inclined with respect to the axis, that is, the inclination accuracy of the V-groove with respect to the axis, the bearing play, etc., tilt the pickup optical axis not only right and left but also back and forth. Therefore, the V-groove had to use expensive and high-precision bearings 6 and 8.

Further, since the V-groove bearing 8 is pressed against the guide rail 3 by the urging force of the spring 7, a resonance phenomenon with the spring 7 may occur. Therefore, a design considering resonance is required. There was a problem.

[Object of the invention]

The present invention, in order to solve the above-described problems in the conventional optical disk pickup driving device, a magnetic conductive material that can easily obtain planar accuracy, for example, a rolled steel material, and the accuracy of parts such as bar steel and the like that can easily obtain linear accuracy, It is an object of the present invention to provide a pickup driving device for an optical disk which can obtain a high accuracy at a low price by obtaining the position and inclination accuracy of the pickup.

[Summary of the Invention]

The present invention relates to an optical disk pickup driving device for achieving the above-mentioned object, and relates to a chassis having a horizontal portion parallel to the surface of the optical disk and a vertical portion perpendicular to the horizontal portion, and movably mounted on the chassis. Between the slider
Attraction force is exerted by a magnet of a slider constituting a linear motor, and guide means between the slider and the chassis is brought into contact with the attraction force generated between the vertical portion of the chassis and the magnet to guide the slider.

(Example of the invention)

Next, an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a chassis, 5 a slider on which the pickup 4 is mounted, and 11 a turntable on which an optical disk is mounted and attached to a spindle motor 12 for rotating the optical disk.

A ball guide 13 is attached to any one of the three locations of the chassis 1 and the slider 5, and a ball 14 is interposed between the chassis 1 and the slider 5. By the rotation of the ball 14, the slider 5 moves in the longitudinal direction of the ball guide 13. , Can be moved on the chassis 1.

A magnet 16 is attached to the two arms 15 of the slider 5.
Is fixed, and a linear motor is formed between the coil 17 fixed to the chassis 1 through which the magnet 16 penetrates and is loosely fitted.
The slider 5 is driven in the longitudinal direction of the magnet 16, that is, in the radial direction of the optical disk by the driving force generated between the sliders 16.

The chassis 1 is formed of a magnetically conductive material such as a rolled steel plate, and therefore, generates an attractive force between the chassis 1 and the magnet 16, and the attractive force does not cause the slider 5 to float above the diameter of the ball 14. The rolling of the ball 14 causes the slide 5 to move on the chassis 1.

A rising portion 18 of the same material as the chassis 1 is formed on one side of the chassis 1 along the arm 15 of the slider 5, and an attractive force acts between the rising portion 18 and one of the magnets 16. It has become.

A round bar rail 19 is mounted on the chassis 1, and two rollers 20 mounted on the slider 5 are pressed against the rail 19 by the above-mentioned suction force.

Therefore, when the slider 5 is driven in the radial direction of the optical disk by the driving force between the magnet 16 and the coil 17, the roller 20 rolls on one side of the rail 19 and is guided. .

As described above, the movement of the slider 5 is guided by the chassis 1 and the rail 19 formed of a rolled steel material or the like, and the accuracy of the optical axis of the pickup 4 mounted on the chassis 5 depends on the accuracy. Will be done.

Incidentally, even if the rail 19 and the roller 20 are mounted in an opposite relationship, the operation and the effect are not changed.

In the above embodiment, the ball 14 moves in the longitudinal direction of the ball guide 13, but a roller may be used instead of the ball.

Further, although the chassis 1 is shown as formed in an L-shape, it is not limited to the L-shape, and the horizontal portion and the vertical portion may be formed separately.

〔The invention's effect〕

As described above, according to the present invention, the movement accuracy such as the position and inclination of the optical axis of the pickup mounted on the slider is determined by the planar accuracy of the chassis that guides the slider by the attraction force of the magnet, and the straightness of the guide means such as a rail. It depends on the precision.

The chassis can be made of a material that can easily obtain planar accuracy such as a rolled steel material having magnetic conductivity, and the guide means, for example, the rail can be formed of a material that can easily obtain linear accuracy such as a steel bar. High accuracy can be achieved.

In addition, this precision is determined by the precision of the parts, and is not affected by the precision of the assembly. Therefore, there is no need for difficult steps requiring precision in the assembling process, and the assembling work is facilitated, and the precision of the parts can be obtained at a low cost. Therefore, the cost of the apparatus can be reduced.

Furthermore, since the bearing with the V-groove is not pressed against the guide rail by the urging force of the spring as in the related art, the resonance phenomenon does not occur, so that it is possible to eliminate the difficulty of designing in consideration of the resonance. It has the effect of.

[Brief description of the drawings]

1 is a plan view of one embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a sectional view thereof, and FIG. 4 is a plan view of a conventional apparatus. 1 ... Chassis, 4 ... Pickup, 5 ... Slider, 11 ... Turntable, 13 ... Ball guide, 14 ...
... ball, 16 ... magnet, 17 ... coil, 18 ... rising part, 19 ... rail, 20 ... roller.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 7/085 G11B 21/02 610

Claims (1)

(57) [Claims] 1. A chassis having a horizontal portion made of a magnetic conductive material parallel to the optical disk surface and a vertical portion perpendicular to the horizontal portion, and moving means for moving on the chassis to the horizontal portion of the chassis. A slider mounted with an optical pickup, a magnet fixed to the slider and generating an attraction force between the horizontal portion and the vertical portion of the chassis, and a magnet fixed to the chassis and fixed to the chassis. An optical disc pickup driving device comprising: a coil forming a linear motor; and guide means for energizing the slider by means of an attraction force generated between the magnet and the vertical portion.