JPS6265268A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To eliminate easily unnecessary oscillation due to arms by adding various means to plural head arms. CONSTITUTION:Plural magnetic discs 2 are held on a base 1 by a spindle 3 and are rotated at a high speed by a motor 4 provided under them. An actuator 7 is arranged on the base 1, and magnetic heads 5 fixed to head arms 6 are allowed of face magnetic discs 2 to read and write information on magnetic discs. Head arms 6 are driven by the actuator 7. Since plural head arms 6' having the same shape are different in natural resonance fraquency from one another bacause of various mass 17, resonance of arms for head seek is not prevented. Mass 17 consists of a lead plate or a stainless plate.

Description

[Detailed Description of the Invention] [Summary] This is a magnetic disk device in which masses having different masses are added to a plurality of head arms made of the same shape, the resonance points of each head arm are shifted, and the head Removed unnecessary vibrations caused by the arm.

[Industrial application field]

The present invention relates to a magnetic disk device, and more particularly, to a magnetic disk device in which the resonance points of each head arm are shifted to prevent troubles such as unnecessary resonance.

A magnetic disk drive is used as a peripheral device for computers, etc., and a head is held on a high-speed rotating magnetic disk with a small gap between the heads, and information is recorded on a large number of concentric tracks on the magnetic disk. To increase recording capacity, multiple magnetic disks and heads are generally stacked.

Recently, with the increase in recording density, the interval between trunks has become narrower, and the positioning of the head to the target trunk is more likely to occur due to vibration of the head arm.

Therefore, there is a need for a head arm structure that prevents vibration of the head arm caused by the arm.

[Conventional technology]

Figure 3 is a cross-sectional view of a conventional magnetic disk device.
A plurality of magnetic disks 2 are held by a spindle on the top, and are rotated at high speed by a motor 4 provided below.

A head 5 for reading/writing information on the magnetic disk 2 is arranged facing the magnetic disk 2, and the head 5 is fixed to a head arm 6 driven by an actuator. In addition, since the distance between the head 5 and the magnetic disk 2 is very narrow due to magnetic characteristics, dust etc. may enter the head 7,
The magnetic disk 2 is covered with an airtight cover 8 so as not to be damaged.

FIG. 4 is a perspective view of a conventional actuator with fixed head arms, in which each head arm 601 is fixed to the actuator tough. The actuator 7 has a macnet 9, a coil LO, and a yoke LL, and has a structure that rotates the head arm 6 about a swing shaft 12.

[Problem that the invention seeks to solve]

In conventional magnetic disk drives, head arms of the same shape are often used due to cost considerations. This causes the resonance points of each arm to have the same frequency, causing resonance due to the swinging of the head arm 6 during head seek, causing problems such as unnecessary vibrations.

In order to prevent this, conventional measures have been taken such as attaching damping 13 shown in FIG. 5 to the actuator system or to the head arm. Damping 13 is weight 1
Rubber 15 is attached around 4, and its outer periphery is covered with a metal case.

However, this damping 13 has the disadvantage that it is highly dependent on temperature and humidity, the hardness of the rubber changes with temperature, and the rubber friction increases and decreases with humidity, and it is difficult to prevent unnecessary resonance. there were.

[Means for solving problems]

FIG. 1 is a diagram explaining the present invention in detail.

In FIG. 1, 7 is an actuator to which a plurality of head arms 6 (two in the figure) of the same shape are attached. In order to make the natural resonance frequencies of the arms different, in the present invention, a head arm 6 is used with a mass 17 attached to one side of the head arm 6. (separate resonant frequencies).

5 is the head, which is attached to the tip of the head arm 6゛.
It faces the magnetic disk 2 and is driven by an actuator. Further, the magnetic disk 2 is rotated by a spindle 3.

[Effect]

That is, since masses each having a different mass are added to a plurality of head arms 6 of the same shape of the magnetic disk device, the resonance points of the head arms are shifted.

Therefore, unnecessary vibrations caused by the head arm that occur during head seeking can be eliminated.

〔Example〕

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

FIGS. 2(a) and 2(b) are diagrams explaining the present invention in detail. Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 2(A) shows a perspective view of the 7 actuator of the present invention. In the figure, 7 is an actuator to which a plurality of head arms 6 (four in the figure) of the same shape are attached. Multiple head arms 6 are used to make the arm stiffness different from the resonance frequency.
Masses 17 (lead plate, stainless steel plate, etc.) having different ljt are attached to the same point, respectively, and the natural frequencies are set to be different from each other. Each head arm 6' is fixed to the actuator tough. Reference numeral 5 indicates a head, and the actuator tough has a magnet 9, a coil 10, and a yoke 11, and has a structure in which a head arm 6' is rotated about a swing shaft 12.

FIG. 2(b) shows a magnetic disk device of the present invention, in which the second
The actuator shown in Figure (a) with a fixed head arm was applied.

In the figure, reference numeral 1 denotes a base, on which a plurality of magnetic disks 2 are held by a spindle 3 and rotated at high speed by a motor 4 provided below. The actuator 7 is arranged on the base 1, and the magnetic head 5 fixed to the head arm 6 faces the magnetic disk 2 so as to read/write information on the magnetic disk 2. The head arm 6 is driven by an actuator 7. In addition,
8 is a sealing cover.

Since the plurality of head arms 6' having the same shape have different natural resonance frequencies due to the masses 17 having different masses, the arms do not resonate during head seek.

The mass 17 may be a simple shape such as a lead plate or a stainless steel plate,
There is no need to attach a rubber 15 around the weight 14 and cover the outer periphery with a metal case 6 like the conventional damping 13 shown in FIG. 5, and there is no dependence on temperature, humidity, etc. Unwanted resonance can be easily prevented.

The above is an example in which masses with different masses are added to the same point on a head arm made of the same shape, but as another example, it is also possible to attach objects with the same mass to different points on the arm. good.

The same applies to a combination thereof.

〔Effect of the invention〕

As explained above, according to the present invention, by adding a mass of a simple shape to a head arm of the same shape, the resonance point of each arm can be changed, and unnecessary vibration caused by the arm can be easily removed. The effect it can have is huge.

[Brief explanation of drawings]

Figure 1 is a diagram explaining the present invention in detail, Figure 2 (a) and (b) are diagrams explaining the invention in detail, Figure 3 is a diagram explaining a magnetic disk device, and Figure 4 is a diagram explaining the conventional FIG. 5 is a perspective view of the actuator with the head arm fixed. FIG. 5 is a diagram illustrating damping. In the figure, l is the base, 2 is the magnetic disk, 3 is the spindle, 4 is the motor, 5 is the head, 6.6' is the head arm, 7 is the actuator, 8 is the sealing cover, 9 is the magnet, 10 is the coil, 11 indicates a yoke, and 12 indicates a swing axis.

Claims (1)

[Claims] A plurality of head arms (6, 6'
) and the actuator (
7), and a magnetic disk device comprising a drive unit for rotating a magnetic disk (2), characterized in that masses (17) each having a different mass are added to the plurality of head arms (6, 6'). magnetic disk device.