JPS60136984A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To decrease the track shift of a head by covering a heating section of a VCM reaching the highest temperature with a barrier of high conductivity, connecting and sealing the HDA inside and the part covered with the barrier and cooling forcibly the outside of the barrier with cooling air. CONSTITUTION:A coil 5 at the rear part of a carriage 4 is positioned to a gap of a magnetic circuit of the VCM6, the carriage receives a force generated by mutual action between the current flowing to the coil 5 and the magnetic field of the gap and positions a magnetic head 3 to a prescribed track. They are placed in a closed space formed with a shroud 7 and a barrier 9 provided to the VCM6 so as to avoid invasion of outer air as the internal circulation type HDA. Since most of the heat generated in the coil 5 is dissipated externally near the VCM6 by covering the coil 5 of the VCM6 of the HDA with the barrier 9 having good heat conductivity, the temperature fluctuation is decreased remarkably and the track shift of the head caused by temperature difference is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device having a coil cooling means in an internal circulation type Herad disk assembly (hereinafter referred to as HDA).

[Background of the invention]

In order to properly write and read information in a magnetic disk device, it is necessary to fill the inside of the HDA (an assembly that houses a magnetic head, a magnetic disk, etc.) with clean air with extremely little dust. Furthermore, in order to minimize the thermal expansion of each part that occurs as the temperature inside the HDA rises, the track deviation of the magnetic head can be minimized.

A means must be provided to dissipate internal heat to the outside. HDA, which is currently in practical use, has two main methods to achieve both of these. There is a method that keeps the air clean and at the same time discards internal heat generation from the exhaust port, the so-called external blowing method, and a method that is filled with clean air when assembling the HDA, and a circulation filter is installed inside the sealed interior to keep the internal air passing through and keep it clean. method.

There is a so-called internal circulation method. FIG. 1 shows a conventional internal circulation type HDA. This HDA.

A plurality of magnetic disks 1 are stacked on a spindle hub 2 and rotatably supported. - A magnetic disk 3 for writing or reading actual information is attached to a carriage 4 and supported so as to be movable approximately in the radial direction of the magnetic disk 1. A driving coil 5 is attached to the rear end of the carriage 4. This coil 5 is connected to a voice coil motor (
It is located in the magnetic circuit gear/knob portion of the magnetic circuit gear (hereinafter referred to as VCM) 6, and receives the force generated by the interaction between the current flowing through the fill 5 and the magnetic field of the gear knob portion. Therefore, the V CM 6 operates to move the carriage 4 and position the magnetic head on a predetermined track. All of these mechanisms are covered by Sealoud 7.

This Sealoud 7 and internal mechanism are called HDA, and the coil 5 is cooled by the air flow generated by the 10 rotations of the magnetic disk, and the air is always kept clean by the circulation filter 8 installed inside. This internal circulation type HD
In A, the inside and outside air are basically isolated,
Since internal heat generation is released by heat dissipation from the surface of the shroud 7, the problem arises that the temperature inside the HDA becomes higher than in the external blowing method. Note that, for example, it may be possible to provide a breathing filter section (not shown) to adjust the pressure difference caused by the expansion and contraction of the internal air, but the flow rate of this breathing filter section is so small that it can be ignored. Therefore, the heat dissipation effect is extremely small.

Furthermore, the heat generated by the carriage drive coil 50 varies over time depending on the frequency of access, the number of accessed cylinders, etc., so it is not necessarily constant, and has the drawback of being a major factor in temperature rise and temperature distribution fluctuations. there were.

In addition, since the air circulating inside is heated by the heat generated by the friction between the magnetic disk 7 and the internal air,
The drawback was that the cooling effect was low.

[Purpose of the invention]

An object of the present invention is to cool the coil part in an internal circulation type HDA by making more effective use of external cold air, thereby suppressing the temperature rise in the HDA and making the temperature distribution uniform. An object of the present invention is to provide a magnetic disk device that can reduce track deviation.

[Summary of the invention]

Among magnetic disk devices, especially in the case of internal circulation type HDA, the causes of temperature distribution between each magnetic disk are as follows:
Air that has become hot in the coil section may flow into the space between the discs without becoming uniform. Since heat generation in the fill section fluctuates over time, it is difficult to make it completely uniform. In the present invention, the heat generated within the HDA and the heat generated in the coil are combined.

We devised a method to capture it very close to the place where the highest temperature occurs.

That is, the present invention covers the heat generating part of the VCH, which reaches the highest temperature together with the heat inside the HDA, with a partition wall having good thermal conductivity.
The inside of the HDA and the portion covered by the partition wall are connected and sealed, and the outside of the partition wall is forcibly cooled by cooling air.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail using FIG. 2.

The HDA shown in FIG. 2 includes a plurality of magnetic disks 1 stacked on a spindle hub 2 and rotatably supported, and a plurality of magnetic disks 1, which write or read information, and which are attached to a carriage 4 and move approximately in the radial direction of the magnetic disks 1. It has a magnetic head 3 that can be supported, and a carriage 4 to which a driving coil 5 is attached at the rear end. In this carriage 4, the coil 5 at the rear end is located in the magnetic circuit gap part of the VCH 6, and receives a force generated by the interaction between the current flowing through the coil 5 and the gear part magnetic field, and moves the magnetic head 3 to a predetermined track. It operates in such a way as to position it. These mechanisms are placed in a closed space formed by the shroud 7 and the bulkhead 9 provided in the V CM 6.

As an internal circulation type HDA, it is configured to prevent outside air from entering. Note that, as in the conventional HDA, the air flow generated by the 10 rotations of the magnetic disk is kept clean by the circulation filter 8.

Now, the HDA according to this embodiment includes coil 5 of VCM6,
That is, by covering the heat generating part with the partition wall 9 having good thermal conductivity,
Since a considerable portion of the heat generated in the coil 5 can be released to the outside near the VCM 6 without flowing into the HDA, it is possible to significantly reduce temperature fluctuations caused by the heat generated in the coil, which fluctuates over time in the conventional example. This makes it possible to reduce head track misalignment caused by temperature differences. The partition wall 9 can be effectively cooled by using copper, aluminum, or the like, which has good thermal conductivity.

It is also possible to use this partition wall 9 in place of a short ring in the magnetic circuit.

Further, by providing a blowing means 10 for directing cold outside air to the main partition wall 9, it is possible to enhance the cooling effect of the heat generated by the fill section.

〔Effect of the invention〕

According to the present invention, as explained above, by providing a cooling means in the heat generating part that reaches the highest temperature due to the heat inside the HDA and the heat of the coil, there is a possibility that it becomes a major cause of temperature rise and temperature distribution fluctuation. The heat generated by the coil can be cooled by effectively utilizing the cold air outside. Therefore, it is possible to reduce melac displacement caused by thermal expansion of each component constituting the HDA, and to increase the density of the tracks.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of a conventional Herad disk assembly, and FIG. 2 is a cross-sectional plan view of a Herad disk assembly according to an embodiment of the present invention. [Explanation of symbols] 1...Magnetic tissue, 2...Spindle hub, 5
...Magnetic head, 4...Carriage, 5...Coil, 6...VCM. 7... Cover (Sea Loud), 8... Circulation filter, 9... Partition wall. No. ! Figure 2

Claims (1)

[Claims] (1) A plurality of magnetic disks stacked on a spindle, magnetic heads arranged in correspondence to read and write information on these magnetic disks, an actuator that supports the magnetic heads, and an actuator that drives the actuators. In a magnetic disk drive having a drive means and a shroud that covers the drive means, a partition wall covering the heat generation part is provided to air connect the vicinity of the heat generation part of the drive means and the shroud, and the inside of the shroud is provided through the partition wall. A magnetic disk device characterized by dissipating heat.