JPS61271664A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To improve the reliability by providing plural vent holes flowing air at the inside and outside to a side wall of a spindle hub and providing a vent hole to the upper face of the spindle hub so as to improve the cleaning capability of the air in the housing and to reduce the danger of head crash. CONSTITUTION:The air gap A is provided between the lower face of the spindle hub 3 and the upper face of the housing 5, plural vent holes 3c are provided to the side wall 3b of the hub 3 and plural vent holes 3d are provided to the upper part and an air filter 9 is adhered to the inside of the vent hole 3c. Plural vent holes 2a are provided to a spacer ring 2. A magnetic disc 1 is turned together with the drive of the spindle motor 4 to cause air flow from the inner circumference toward the outer circumference of the magnetic disc 1. That is, the air flow from the inside to the outside of the hub 3 is caused through the vent holes 2a, 3c and lots of air flows into the inside of the hub 3 through the vent hole 3d in addition to the air flow passing through the air gap A and the air is cleaned by the air filter 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive having an air flow system with a central blowout structure.

[Conventional technology]

The recent development of magnetic disk drives has resulted from improved designs such as higher performance, smaller size, and lower cost.

Specifically, the realization of high-density recording and high-precision mechanisms play a major role. The basic operation of current magnetic disk devices is that the magnetic head maintains a small gap with the rotating magnetic disk to levitate and perform magnetic recording, and therefore the main parts related to this are extremely clean. Environmental preservation is an important issue for magnetic disk drives. Conventional magnetic disk drives employ a method called an airflow type with a central blowout structure as one method of cleaning the air inside the housing that seals and houses the magnetic disk and magnetic head. There is. This method utilizes the fan effect of the spindle hub that rotates the magnetic disks to blow air between the magnetic disks from the center of rotation to the outer periphery of the magnetic disks and circulate the air between the disks. This method purifies the air inside the housing by removing dust.

[Problem to be Solved by the Invention J The above-mentioned conventional center blowout m* air flow system has a flow path for air returning to the rotation center side of the magnetic disk.
Since there is only a gap between the spindle hub and the housing, the gap is generally narrow and has the disadvantage of high flow resistance. That is, since the flow path resistance is large, the amount of air circulated is small, and therefore the air purifying ability is low, resulting in a disadvantage that a sufficient cleaning effect cannot be achieved.

The problem to be solved by the present invention, in other words, the purpose of the present invention is to eliminate the drawbacks of the air flow system of the conventional magnetic disk device as described above, and to improve the ability to clean the air inside the housing, thereby improving the head An object of the present invention is to provide a highly reliable magnetic disk device with less risk of crash.

[Means for solving problems]

In the magnetic disk device of the present invention, a plurality of magnetic disks are stacked via a spacer ring and mounted on a spindle hub, the spindle hub is fixed to a main shaft of a spindle motor, and the spindle hub is housed together with a magnetic head positioning mechanism. and a magnetic disk drive having a configuration in which the spindle hub is hermetically housed with a cover, the spindle hub having a plurality of first passages provided on its side wall to allow air to circulate between the inside and outside of the spindle hub. and at least one second ventilation hole provided on the upper part of the spacer ring to allow air to flow between the inside and outside of the spindle hub, and the spacer ring has at least one second ventilation hole provided in the upper part of the second ventilation hole to allow air to flow between the inside and the outside of the spindle hub. a third ventilation hole penetrating the inside and outside at a position corresponding to the first ventilation hole, and an air filter disposed on the inner surface of the side wall of the spindle hub to seal the first ventilation hole. .

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

The figure shows a cross-sectional view of an embodiment of the present invention.

In the figure, a plurality of magnetic disks 1 are stacked and mounted on a pedestal 3a formed at the bottom of a spindle hub 3 alternately with spacer rings 2 to maintain a predetermined spacing. A hole provided in the upper center of the spindle hub 3 is fitted and fixed to the tip of the extension of the main shaft 8 of the spindle motor 4, and therefore the spindle motor 4
The rotation of the magnetic disk 1 causes the magnetic disk 1 to rotate. The main shaft 8 is rotatably held by two bearings 10a and 10b held at the upper and lower ends of a bearing holding portion 5a protruding from the housing 5.

A space is formed in the center lower part of the threaded hub 3 so that the above-mentioned bearing holding part 5a can be inserted, and between the inner circumferential surface of the side wall part 3b surrounding this space and the outer circumferential surface of the bearing holding part 5a. allows air circulation. A gap A is also provided between the lower surface 3e of the spindle hub 3 and the upper surface of the housing 5, and air can circulate through this gap. Furthermore, the side wall 3b of the spindle knob 3 has ventilation holes 3C at several locations dividing the circumference as appropriate, and the upper part thereof has a plurality of ventilation holes 3d provided vertically penetrating at appropriate positions. A cylindrical air filter 9 is attached inside the ventilation hole 3C. On the other hand, the spacer ring 2 is also provided with a plurality of vent holes 2a penetrating inside and outside at positions corresponding to the vent holes 3C.

The housing 5, which accommodates the magnetic disk 1 and the magnetic head positioning mechanism 6 equipped with a magnetic head for writing and reading information on the magnetic disk 1, is sealed from the outside air by sealing the upper side with the cover 7. Forms a sealed structure.

In the magnetic disk device configured as described above, when the magnetic disk 1 rotates due to the rotation of the spindle motor 4, the magnetic disk 1 is rotated by the centrifugal force generated by the rotation.
An air flow is generated that flows from the inner circumferential side to the outer circumferential side. Accordingly, the air inside the sealed housing 3 circulates inside the housing as shown by the arrows in the figure. In other words, an air flow is generated that passes through the ventilation hole 2a of the spacer ring 2 and flows from the inside of the spindle hub 3 to the outside. The air flows into the space inside the spindle hub 3, and the air is removed from dust by the air filter 9 and returned, so that the air flowing back inside the housing 3 is constantly purified.

〔Effect of the invention〕

As explained in detail above, the present invention provides a spindle hub 3.
By providing the ventilation holes 4 on the upper surface of the spindle hub 3, it is possible to reduce the flow resistance of the air supply path toward the center of the spindle hub 3, thereby increasing the amount of air circulation. This increased air circulation helps purify the air within the sealed housing.
As a result, head crashes due to the influence of dust can be prevented and the reliability of the magnetic disk device can be improved.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the magnetic disk device of the present invention. 1...Magnetic disk, 2...Spacer link, 3...Spindle hub, 4...
・Spindle motor, 5... Housing, 6.
... Magnetic head positioning mechanism, 7 ... Cover, 8 ... Main shaft, 9 ... Air filter, 10 ... Bearing.

Claims (1)

[Claims] A plurality of magnetic disks are stacked via a spacer ring and mounted on a spindle hub, the spindle hub is fixed to the main shaft of a spindle motor, and the spindle hub is sealed and housed together with a magnetic head positioning mechanism by a housing and a cover. In the magnetic disk drive having the above configuration, the spindle hub has a plurality of first ventilation holes provided on a side wall thereof to allow air to circulate between the inside and outside of the spindle hub, and a plurality of first ventilation holes provided on the top thereof. at least one second ventilation hole for allowing air to flow between the inside and outside of the spindle hub, and the spacer ring is arranged inside and outside of the spacer ring at a position corresponding to the first ventilation hole. A magnetic disk drive comprising: a third ventilation hole passing through the spindle hub; and an air filter disposed on an inner surface of the side wall of the spindle hub to seal the first ventilation hole.