KR20040078513A - Information record/regeneration apparatus having micro actuator - Google Patents

Abstract

PURPOSE: An information recording/reproducing device having micro actuators is provided to comprise micro actuators for driving an arm such that a head can conduct a relative motion to a disk. CONSTITUTION: A disk(13) has a recording surface, and is rotatively disposed. A mount portion(19) is firmly disposed on one side of the disk(13). A head(17) is disposed to record information on the recording surface or to reproduce the recorded information. One end of an arm(21) is coupled with the head(17), and the other end is extended toward the mount portion(19) to support the head(17) such that the head(17) can conduct a relative motion to the disk(13). The first to fourth micro actuators(23a,23b) drive the arm(21), so that the head(17) can conduct the relative motion.

Description

Information recording / reproducing apparatus with a micro actuator {INFORMATION RECORD / REGENERATION APPARATUS HAVING MICRO ACTUATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus provided with a micro actuator, and more particularly, to an information recording / reproducing apparatus provided with a micro actuator capable of precise position control of a head with respect to a disc.

1 is a diagram showing a head area of a conventional information recording / reproducing apparatus. As shown, the information recording / reproducing apparatus includes a base 111 fixedly arranged in a plate shape, a disk 113 rotatably disposed on one side of the base 111, and a thickness direction of the disk 113. The head 115 is disposed on one side and records information on the disk 113 or reproduces the recorded information, and the swing arm 117 is arranged along the plate surface direction of the disk 113 and the head 115 is coupled to one end. And an actuator 121 disposed at an opposite end of the head 115 along the longitudinal direction of the swing arm 117 to allow the head 115 to move along the radial direction of the disk 113. have.

The base 111 is provided with a rotating shaft 118 to rotatably support the swing arm 117, and the swing arm 117 to support the swing arm 117 with respect to the rotating shaft 118 to rotate. The bearing part 119 is provided.

The head 115 is typically provided with a slider structure so that the buoyancy can be generated so that the head 115 is spaced apart from the recording surface of the disk 113 when the disk 113 is rotated, and in recent years, MEMS (MEMS) to enable precise focusing. MEMS Actuators using Micro Electro Mechanical Systems are also available.

The actuator 121 is composed of a so-called Voice Coil Motor (VCM) that generates a fine driving force so that the head 115 can follow the track of the disk 113.

On the other hand, the disk 113 is a magnetic formula having a recording layer coated with a magnetic material, a laser formula using a laser beam, and a magnetic / magnetic effect of a recent magnetic thin film to record information / data and to read it using a magneto-optical effect. It is composed of magneto-optical.

By the way, in such a conventional information recording / reproducing apparatus, the swing arm 117 is coupled to the rotating shaft 118 via the bearing portion 119 to rotate about the rotating shaft 118, so that the bearing portion 119 Due to the frictional force of), not only the required driving force is increased but also it is difficult to precisely control the position of the head 115.

In addition, when the swing arm method is applied to the magneto-optical type, a lens and a coil (not shown) are arranged on the head 115 side, and in particular, a MEMS actuator (not shown) for focusing the head 115 is provided on the head 115 side. In the case of the head 115, the inertia of the head 115 is generally increased, so that the response speed is absolutely slow to compensate for the motion error of the head 115 in real time, and thus the real time motion compensation is very difficult. Not only becomes difficult to precise position control, but also causes a decrease in frequency characteristics and a deterioration in focusing control characteristics.

It is therefore an object of the present invention to provide an information recording / reproducing apparatus having a magnetically driven head capable of precisely controlling the position of the head relative to the disk.

1 is a diagram showing a head area of a conventional information recording / reproducing apparatus;

2 is a plan view of an information recording / reproducing apparatus having a micro actuator according to an embodiment of the present invention;

3 is a perspective view of the micro actuator region of FIG. 2;

4 is a partial side view of FIG. 2;

FIG. 5 is a diagram for describing the micro actuator of FIG. 2.

Explanation of symbols on the main parts of the drawings

11: base 13: disk

17: head 19: mount portion

21: Arm 23a ~ 23d: Micro Actuator

27: drive driver

The object is, according to the present invention, a disk disposed rotatably with a recording surface; A head disposed on one side of the recording surface of the disk to enable at least one of recording and reproducing information on the recording surface of the disk; A mount unit fixed to one side of the disk; An arm coupled to the head along a length direction and the other side extending toward the mount portion; One end is connected to the mount portion and the other end is connected to the mount side end of the arm and includes a micro actuator for driving the arm so that the head moves relative to the disk. Achieved by one information recording / reproducing apparatus.

Here, the micro actuator is preferably configured as a pair disposed in the mount portion spaced apart from each other along the plate surface direction of the disk so that the head can be moved along the radial direction of the disk.

The micro actuator is effectively configured as a pair disposed in the mount portion spaced apart from each other along the thickness direction of the disk so that the head is moved along the thickness direction of the disk.

The micro actuators are preferably composed of a plurality of pairs arranged to be spaced apart from each other along the plate surface direction of the disk and at the same time disposed in the mount portion spaced apart from each other along the thickness direction of the disk.

It is effective to configure the micro actuator as a piezoelectric actuator.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 is a plan view of an information recording / reproducing apparatus having a micro actuator according to an embodiment of the present invention, FIG. 3 is a perspective view of the micro actuator region of FIG. 2, FIG. 4 is a partial side view of FIG. FIG. 2 is a diagram for describing the micro actuator of FIG. 2. As shown in these figures, the information recording / reproducing apparatus provided with the present micro actuator includes a disk 13 rotatably disposed with a recording surface, and a mount portion 19 fixedly disposed on one side of the disk 13. ), A head 17 arranged to record information on the recording surface of the disk 13 or to reproduce the recorded information, one end coupled to the head 17 and the other end mounted along the plate surface direction of the disk 13. An arm 21 extending toward the portion 19 and supporting the head 17 so as to be capable of relative movement with respect to the disk 13, and between the mount portion 19 and the arm 21 so as to be elastically interposed. And first to fourth micro actuators 23a to 23d for driving the arm 21 so that the head 17 is relative to each other.

On one side of the upper surface of the base 11 fixedly arranged in a plate shape, the disk 13 is rotatably disposed about the rotation axis, and the mount portion 19 on one side of the disk 13 along the plate surface direction of the base 11. Is formed.

A head 17 is disposed above the disk 13, and the other end of the arm 21 is disposed in the head 17 along the plate surface direction of the disk 13 and one end thereof is extended toward the mount portion 19. Is combined.

On the other hand, between the mount portion 19 and the arm 21, one end is integrally coupled to the mount portion 19, and the other end is integrally coupled to the mount portion 19 side end portion of the arm 21 so that the arm 21 is connected. Supporting first to fourth micro actuators 23a to 23d are interposed.

Each micro actuator 23a to 23d is composed of a piezoelectric actuator formed by stacking a conventional piezoelectric material, for example, a plurality of ceramics 25 having a disk shape in a thickness direction, as shown in FIG. The piezoelectric actuator has a predetermined displacement ΔL with respect to the entire length L in the axial direction when the predetermined voltage is applied while consuming little current.

Each of the micro actuators 23a to 23d is electrically connected to a driving driver 27 that applies a different electric field so as to be distorted, that is, stretchable in the thickness direction of the ceramic 25.

With this configuration, when the head 17 is to be moved outward in the radial direction of the disk 13, each drive driver 27 has a first micro actuator 23a and a third micro actuator 23c. The second micro actuator 23b and the fourth micro actuator 23d are extended along the axial direction, and the second micro actuator 23b and the fourth micro actuator 23d are extended along the axial direction. In order to move the head 17 toward the rotating shaft 15 along the radial direction of the disk 13, the respective drive drivers 27 are the first micro actuator 23a and the third micro actuator 23c as described above. ) Is extended along the axial direction and the second micro actuator 23b and the fourth micro actuator 23d are contracted in the axial direction.

On the other hand, when the disk 13 is inclined with respect to the rotational axis or when the arm 21 is twisted, each drive driver 27 has a degree of tilt of the disk 13 and / or a twist of the arm 21. In consideration of the degree, the first to fourth micro actuators 23a to 23d are appropriately expanded and contracted to effectively cope with tilting and torsion.

As described above, according to the present invention, a disk having a recording surface rotatably disposed, a head disposed to record information on the disk or to reproduce recorded information, a mount portion fixedly disposed on one side of the disk; The head is coupled to one end and the other end is arranged to extend toward the mount along the plate surface of the disk, and is elastically disposed between the mount and the arm to drive the arm so that the head can move relative to the disk. By providing a micro actuator, an inertia on the head side can be prevented from increasing, and an information recording / reproducing apparatus having a micro actuator capable of precise position control of the head is provided.

Claims (5)

A disk rotatably disposed with a recording surface; A head disposed on one side of the recording surface of the disk to enable at least one of recording and reproducing information on the recording surface of the disk; A mount unit fixed to one side of the disk; An arm coupled to the head along a length direction and the other side extending toward the mount portion; One end is connected to the mount portion and the other end is connected to the mount side end of the arm and includes a micro actuator for driving the arm so that the head moves relative to the disk. One information recording / playback device. The method of claim 1, The micro-actuator comprises a pair of information arranged with the micro-actuator, characterized in that arranged in the mount portion spaced apart from each other along the plate surface direction of the disk so that the head can be moved along the radial direction of the disk. / Playback device. The method of claim 1, The micro actuator is a pair of information recording / reproduction with a micro actuator, characterized in that the head is arranged in the mount portion spaced apart from each other along the thickness direction of the disk to move in the thickness direction of the disk Device. The method of claim 1, The micro-actuator includes a plurality of pairs of micro actuators, which are arranged to be spaced apart from each other along the plate surface direction of the disc and are spaced apart from each other along the thickness direction of the disc. Playback device. The method according to any one of claims 1 to 4, And the micro actuator is a piezoelectric actuator. The information / recording and reproducing apparatus provided with the micro actuator.