JPH0676499A - Disk device - Google Patents

Abstract

PURPOSE:To obviate the generation of static friction and to prevent the generation of a dead zone as a hinge member serves as a fulcrum at the time of turning of an arm by connecting the hub part of an arm and a fixing member by the hinge member. CONSTITUTION:One end of a suspension 8 is fixed to a mounting region 6 of the rigid arm 2 of a rotary actuator assembly 1. A slider 12 including a magnetic head is mounted via a flexer 10 to the other end of the suspension 8. A cylindrical hinge type arm holding member 18 is fixed to a base by a lock bolt 16A on the inner side of the hub part 4 of the arm 2. A holder 18 is so positioned that its center aligns to the central axis in the longitudinal direction of the assembly 1. The hub part 4 of the arm 2 and the holder 18 are connected by thin flat planar hinge members 20, 22. The end is fixed to the hub part 4 and the holder 18 in such a manner that the members 20, 22 exist in symmetrical positions by aligning these members to the central axis in the longitudinal direction of the assembly 1. Since the fulcrum for turning of the arm 2 is the hinge members 20, 22, the static friction does not arise and the dead zone does not exist either.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk apparatus for rotating an arm supporting a head to position the head at a required position on the disk.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional magnetic hard disk drive, and FIGS. 5 and 6 are a plan view and a side view showing the conventional rotary actuator assembly of FIG. Rotary actuator assembly 1
One end of the suspension 8 is fixed to the attachment area 6 of the rigid arm 2 of 00. A slider 12 including a magnetic head is attached to the other end of the suspension 8 via a flexure 10. Hub part 4 of rigid arm 2
Is rotatably attached to the fixed shaft 16 via a bearing 40. In addition, a portion of the rigid arm 2 that is integrally molded with the hub portion 4 and that extends toward the opposite side of the suspension 8 with respect to the fixed shaft 16 has a VCM.
A (voice coil motor) coil 24 is provided. The arm 2 is rotated about the central axis of the fixed shaft 16 by the driving force of the VCM coil 24C, and the slider 12 including the magnetic head is positioned at a required position on the magnetic hard disk 30.

[0003]

The above-mentioned conventional magnetic hard disk drive has the following problems because the arm 40 is rotated by using the bearing 40, that is, the ball bearing as a rotation support system. (1) Since the ball bearing is expensive, the cost is high. (2) When the VCM operation is started, that is, when the arm starts to rotate, static friction occurs between the balls in the bearing, the retainer, the inner ring and the outer ring, and the enclosed grease. There is a control problem. (3) Due to the reason (3) above, a narrow track pitch causes off-track, which is an obstacle to realizing higher density recording.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a low-cost disk device in which static friction does not occur at the start of rotation of an arm.

[0005]

In the disk device of the present invention, an arm (for example, the rigid arm 2 of the embodiment) that supports a head (for example, a magnetic head included in the slider 12 of the embodiment) is rotated. , Head to disk (eg
The magnetic disk 30 of the embodiment is positioned at a required position, and a fixing member (for example, the hinge-type arm holder 18 of the embodiment) is provided inside the hub portion (for example, the hub portion 4) of the arm. ) Is provided, and the hub portion and the fixing member are connected by a hinge member (for example, thin plate-shaped hinge members 20 and 22 of the embodiment).

[0006]

In the disk device of the present invention having the above structure,
Since the hinge member serves as a fulcrum when the arm rotates, static friction does not occur.

[0007]

1 is a perspective view showing the configuration of an embodiment in which the present invention is applied to a magnetic hard disk device, and FIGS. 2 and 3 are plan views showing a rotary actuator assembly of the embodiment of FIG. FIG. Rotary
One end of a suspension 8 is fixed to the mounting area 6 of the rigid arm 2 of the actuator assembly 1.
A slider 12 including a magnetic head is attached to the other end of the suspension 8 via a flexure 10.

Inside the hub portion 4 of the rigid arm 2, a cylindrical hinge type arm holder 18 is provided with a tightening bolt 16A.
It is fixed to the base (not shown) by. The hinged arm holder 18 is positioned such that its center coincides with the central longitudinal axis of the rotary actuator assembly 1. Further, the hub portion 4 and the hinge type arm holder 18 are sized and shaped so that a predetermined space is formed therebetween. Hub part 4 of arm 2
The hinge type arm holder 18 and the hinge type arm holder 18 are connected by thin plate hinge members 20 and 22. The thin flat plate-shaped hinge members 20 and 22 are rotary actuators.
The ends are fixed to the hub portion 4 of the arm 2 and the hinge type arm holder 18 so as to be arranged symmetrically with respect to each other in accordance with the central axis of the assembly 1 in the longitudinal direction. The thin flat plate-shaped hinge members 20 and 22 have higher rigidity in the direction along the longitudinal center axis of the rotary actuator assembly 1, and the rotary actuator assembly 1
The rigidity of the direction of rotation of the arm 2 due to the driving force of a VCM (voice coil motor) coil 24, which will be described later, is reduced.

A VCM coil 24 is provided at a portion of the rigid arm 2 which is integrally molded with the hub portion 4 and extends on the side opposite to the suspension 8 with respect to the hinge type arm holder 18. The thin plate hinge members 20 and 22 are bent by the driving force of the VCM coil 24, whereby the arm 2 rotates and the slider 12 including the magnetic head is positioned at a required position on the magnetic hard disk 30.

Since the fulcrum of rotation of the arm 2 is the thin plate-shaped hinge members 20 and 22, static friction does not occur and there is no dead zone.

In a 2.5-inch hard disk drive, the rotation angle of the arm 2 is usually about 20 °, and a drive with a smaller diameter of 10 to 15 ° is sufficient. When the rotation angle of the arm 2 is in such a range, the ball bearing is not always necessary, and the hinge-type arm holder 18 and the thin plate-like hinge members 20 and 22 described above are sufficient. Therefore, the embodiment of the present invention can realize the cost reduction of the hard disk drive.

Although the arm supporting the head is arranged above the magnetic disk in the above embodiment, the present invention is not limited to this, and the arm is arranged below the magnetic disk. It can also be applied in cases.

The present invention can be applied not only to the case of one magnetic disk but also to a plurality of magnetic disks.

Furthermore, the present invention can be applied not only to magnetic disks but also to optical disks and magneto-optical disks.

[0015]

According to the disk device of the present invention, since the hub portion of the arm and the fixing member are connected by the hinge member, the hinge member serves as a fulcrum when the arm rotates.
There is no stiction and therefore no dead zones. Further, since the arm is held by the hinge member, the cost can be reduced and the thickness can be easily reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment in which the present invention is applied to a magnetic hard disk device.

FIG. 2 is a plan view showing the rotary actuator assembly of the embodiment of FIG.

FIG. 3 is a side view showing the rotary actuator assembly of the embodiment of FIG.

FIG. 4 is a perspective view showing an example of a conventional magnetic hard disk device.

5 is a plan view showing the conventional rotary actuator assembly of FIG. 4. FIG.

6 is a side view of the conventional rotary actuator assembly of FIG.

[Explanation of symbols]

 2 Rigid arm 4 Hub part 12 Slider 16A Tightening bolt 18 Hinge type arm holder 20,22 Thin flat plate hinge member 24 VCM

Claims (1)

[Claims] 1. An arm for supporting a head is rotated,
A disk device for positioning the head at a required position of a disk, wherein a fixing member is provided inside a hub portion of the arm, and the hub portion and the fixing member are connected by a hinge member. .