JPS6029088Y2 - magnetic disk device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in magnetic disk drives.

In a so-called movable head type disk storage device, as soon as there is a request to retrieve specific information on a rotating storage disk, a movable head is quickly positioned in the radial direction of the rotating storage disk so as to minimize the retrieval time. must be changed.

Therefore, a relatively powerful linear motor is used for head operation to displace and position the movable head, but on the other hand, the positioning of the movable head requires accuracy and high precision. .

However, when the near motor is fixed on a base or performs rapid operation due to a command such as a call, the shock caused by the rapid acceleration and deceleration control causes vibration and a bending moment is generated against the board. , which causes a change in position, or off-track, between the movable head and the information location of the rotating storage disk.

In the past, even if this off-track was large, the recording density of the rotating storage disk was small and there was sufficient margin for information recall and writing, but with the increase in capacity and recording density in recent years, There is not enough margin during writing, and anti-vibration measures are required to reduce the off-track.

The present invention is intended to solve these problems, and aims to provide a magnetic disk device that can reduce failures caused by impact.

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

In FIGS. 1 and 2, 1 is a substrate, and 2 is the substrate 1.
A linear motor 3 fixed above is a movable part (carriage) operated by the linear motor 2, and a movable head 4 is attached to the movable part 3.

5 is a rotating memory disk. Reference numeral 6 denotes a damping mass, and the damping mass 6 is placed above the linear motor 2, which is an excitation source, so that it can move vertically and horizontally in response to the movement of the linear motor 2.

Therefore, when the linear motor 2 performs a rapid operation due to the called and write command, the damping mass 6 is designed to be able to move freely relative to the linear motor 2, so it does not move in synchronization with the linear motor 2, and due to inertia. It moves with a delay due to force, moves back and forth due to friction, and moves up and down when struck with a certain amount of weight.

This movement of the damping mass 6 cancels out the excitation operation of the linear motor 2, making it possible to reduce the above-mentioned off-track.

Note that the weight of the damping mass 6 is preferably about 1 n of the weight of the near motor 2.

FIG. 3 shows the amount of off-track. Curve A shows the amount of off-track when no damping mass is provided. Curve B shows the amount of off-track when a damping mass is provided as in the present invention.

As explained above, according to the present invention, a damping mass of a constant mass is placed on the linear motor, which is the vibration source, so that it can move freely, thereby reducing the force generated by the rapid acceleration and deceleration of the linear motor. Because the vibration is performed in the opposite direction to the excitation force, which cancels out and reduces the bending moment that occurs, a certain phase difference is created with the excitation frequency, and at the same time, the vibration is rapidly attenuated, so the impact force is small. The bending moment is also small, and off-track can be reduced.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of a magnetic disk device according to the present invention, FIG. 2 is a perspective view of the main part thereof, and FIG. 3 is a curve diagram showing the amount of off-track. In the figure, 1 is a base, 2 is a linear motor, 3 is a movable part, 4 is a movable head, 5 is a rotation storage disk, and 6 is a damping mass.

Claims (1)

[Scope of utility model registration request] A magnetic disk drive comprising a movable head, a rotary storage disk, and a linear motor for operating the movable head, characterized in that a damping mass of a constant mass is mounted on the linear motor so as to be freely movable. magnetic disk device