JPS6138547B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk drive with replaceable disk packs.

A magnetic disk drive apparatus records and reproduces information using a rotating disk and a head that maintains a gap of several microns. For this reason, if there is a lot of dust in the air around the shroud where the disk pack is stored, it will get into or accumulate between the head and the disk, and eventually the head and disk will come into contact with each other.
It causes harm that damages both. This failure is the most malicious failure because it destroys information. In particular, the larger the capacity of a disk, the more time and money it takes to reproduce that information. For this reason, the following dust-proof measures have been taken in conventional magnetic disk drive devices.

The first countermeasure is to use an internal dust collection filter that uses the air flow generated by the rotation of the disk pack to collect dust in a magnetic disk drive device in which the disk and head are completely enclosed in a shroud. It is a circulation method. The second measure, in a magnetic disk drive device in which the disk pack can be replaced, is to use a blower to take air from outside the device and supply air with less dust to the shroud through a dust collection filter.

The first measure reduces the amount of dust inside the shroud infinitely depending on the rotation time of the disk pack (internal circulation number) without being affected by the amount of dust outside the device, but the second measure is based on dust compensation. Collection efficiency 100%
There is no problem if you have a filter, but with about 99.9% of the filters currently in use, dust is sent to the shroud depending on the amount of dust outside the device. Especially recently, class 2 million (0.5μm or more dust)
As calculators began to be used in general offices (the number of pieces in 1 ft ³ ), it became impossible to supply air with a small amount of dust to the shroud using a magnetic disk drive device with replaceable disk packs. However, it is difficult to prevent the above-mentioned failure in which the head and disk come into contact and destroy information.

The present invention has been made by focusing on the above points,
The object is to provide a magnetic disk drive device that can minimize the amount of dust on the shroud. For this reason, the magnetic disk drive device according to the present invention communicates the inside of the cover above the center of rotation of the disk pack with the peripheral area of the disk pack through a filter, and internally circulates the air in the shroud when the disk pack rotates to remove dust. It has a first communication pipe for capturing dust, and a second communication pipe for supplying external air that passes through a filter and captures dust to the bottom surface of the shroud when replacing the disk pack.

The present invention will be described in detail below with reference to the drawings.

In the figure, a disk pack 6 consisting of a plurality of disks is used for recording and reproducing information within a shroud section 5 by a magnetic head (not shown). This shroud portion 5 is provided with a cover 7, and this cover 7 has a filter 11 at a position that is the rotation center of the disk pack 6 in the closed state.
is provided. This filter 11 is communicated with the periphery of the disk pack in the shroud section through a communication pipe 20. Furthermore, a communication pipe 30 is provided on the bottom surface 40 of the shroud portion 5 to supply external air via the external air intake port 5, the blower 1, and the filter 2. Furthermore, the shroud section 5 has a micro switch 60 that drives the blower 1 when the cover 7 is detected to be open.

The magnetic disk drive device configured as described above operates as follows. First, shroud part 5
When replacing the disk pack 6 inside, cover 7
The micro switch 60 detects the open state and drives the blower 1. This blower 1
By the drive of the external air inlet 8,
It is supplied into the shroud part 5 through a communication pipe 30 having a filter 2. Therefore, dust is prevented from entering the shroud portion 5 when the disk pack 6 is replaced.

Next, when the replacement of the disk pack 6 is completed and the cover 7 is closed, the micro switch 60 detects this and stops driving the blower 1. When the disk pack 6 rotates in this state, the air on the disk surface flows toward the circumference due to the centrifugal force, so the pressure at the disk pack circumference in the shroud 5 becomes higher than the pressure at the center of rotation. .
Due to this pressure difference, the air that has passed over the surface of the disk flows into the suction port A provided on the side wall of the circumferential portion of the disk pack of the shroud portion 5, and
It passes through the filter 11 and is discharged from the suction port B. That is, as the disk pack 6 rotates, air within the shroud portion 5 is internally circulated via the communication pipe 20 and the filter 11. Therefore, the dust in the shroud portion 5 is blown away in the circumferential direction of the disk, passes through the communication pipe 20, and is captured by the filter 11.

As described above, according to the present invention, when replacing the disk pack, the blower supplies external air to the bottom of the shroud through the filter to prevent dust from entering, and when the device is being driven (when the disk pack is rotating). The natural internal air circulation traps dust, minimizing dust within the shroud.

[Brief explanation of the drawing]

The figure is a diagram showing the main parts of a magnetic disk drive device that is an embodiment of the present invention. Explanation of symbols 1... Blower, 2, 11... Filter, 6... Disk pack, 5... Shroud section,
7...Cover, 60...Micro switch, 20,3
0...Communication pipe.

Claims (1)

[Claims] 1. In a magnetic disk drive device in which a disk pack is stored in a shroud having a cover and the disk pack is replaceable, a first It is equipped with a communication pipe and a second connecting pipe that uses a blower to supply external air to the bottom of the shroud through a filter.When replacing the disk pack, air is supplied into the shroud through the second connecting pipe, and the disk pack rotates. 1. A magnetic disk drive device characterized in that air in the shroud is internally circulated by the first connecting pipe.