JPS61142589A - Cartridge type magnetic disk device - Google Patents

Abstract

PURPOSE:To discharge contamination generated on the surface of a magnetic disk precisely for a short period by forming the 1st and 2nd air pathes making air flow from a magnetic head room into a cartridge case to supply clean air flow into the cartridge case. CONSTITUTION:When a magnetic disk 8c is rotated, an air flow is generated in the same direction as the turning direction shown by the arrow and air in the cartridge case 8 flows into the magnetic head room 7 through an opening 4a while rotating like a vortex. The air flowing into the room 7 is cleaned by an air filter 6 and the 1st air path circulating the cleaned air again into the cartridge case 8. Simultaneously, the cleaned air through the filter 6 is passed through a conduit 7a expanded from a magnetic head room 7 and then made to flow from the opening of the inner bottom of the cartridge case 8a into the case 8 through an air flow hole 15 formed on a spindle frame 14 to form the 2nd air flow.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cartridge type magnetic disk device.

(Prior art) The magnetic disk of a magnetic disk cartridge has approximately the same diameter as a floppy disk, but has a larger storage capacity.
Because it can be driven at high speed and the magnetic recording surface can be accessed with a floating magnetic head, it is attracting attention as a one-chip recording medium for small computers in place of the floppy disk.

The performance required of a magnetic disk device that drives a magnetic disk cartridge is to minimize the occurrence or intrusion of contamination when the magnetic disk is rotated at high speed.

In other words, when the magnetic disk is driven to rotate at high speed, airflow is generated in the rotational direction, and the dynamic pressure between the magnetic head and the magnetic disk is approximately 0.3 μm to 0.5 μm.
It is designed to float while maintaining a gap of m, and if contaminants from the dirt bin enter the cartridge case along with the airflow, it will damage both the head and the recording surface, causing damage to the disc. This may cause damage, head crash, or access error.

In order to take measures against contamination, conventional magnetic disk drives divide the inside of the housing into T, where the cartridge is housed, and T, where the magnetic head is housed. Then, with the lid closed, try VJ1'i! Two shirt plates formed in the above are spaced apart to form two openings. Air from inside the cartridge flows into the magnetic head chamber through one opening, and air from the magnetic head chamber flows into the cartridge through the other opening.

However, in such a structure, purifying air is supplied to the surface of the magnetic disk against the centrifugal force accompanying the rotation of the magnetic disk. Therefore, the efficiency of air circulation is poor. In this case, contamination attached to the surface of the magnetic disk is not eliminated. Therefore, the conventional structure cannot be said to be a sufficient measure against contamination.

(Objective of the Invention) An object of the present invention is to prevent the intrusion of contaminants while a cartridge is installed in a drive device, and to quickly eliminate these contaminants.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention includes a filter provided at the air inflow opening from the cartridge to the magnetic head chamber, and a system in which purified air flowing out from the filter is communicated with the central opening of the cartridge. 11i mold.

(Embodiment) FIG. 1 is a T-side view of a magnetic disk drive y according to the present invention, and FIG. 2 is a sectional view thereof.

The magnetic disk drive shown in the drawing has a housing main body 1 with a ground surface J3 and one side open, a cover 2 that airtightly covers the top surface of the housing main body 1, and a front door 3 that covers the side opening face in an openable and closable manner. It constitutes the shape of

The interior of the housing is airtightly divided by a partition 4 into a chamber 7 in which the magnetic head 5 and an air filter 6 are arranged, and a chamber in which a cartridge 8 is housed.

The partition wall 4 is formed with an opening 4a communicating with the air filter 6 and an opening 4b through which the magnetic head 5 enters and exits, and these openings 4a and 4b are normally closed by a shirt flap plate (not shown). When the cartridge 8 is loaded, it is opened by closing the front door 3 and opening together with a shutter plate (not shown) formed on the case 8a of the cartridge 8, so that the case 8a and the chamber 7 are communicated with each other. ing.

The reference numeral 10 is a gasket attached to the partition wall 4 at the periphery of the openings 4a, 4b, and the reference numeral 11 is a gasket provided on the inner surface of the front rn3.

A magnetic disk drive device, that is, a spindle motor 13 integrally provided with a magnetic chuck 12 on the upper surface is disposed at the center of the inner bottom surface of the cartridge to 9.

A spindle frame 14 is arranged around the outer periphery of the spindle motor 13, and the spindle frame 14 is further provided with air circulation holes 15.

One end 15a of this air circulation hole 15 communicates with a conduit 7a extending from the magnetic head chamber 7, and
The other end 15b faces the opening formed in the center of the cartridge case 8a.

Furthermore, a packing 16 is provided on the upper surface of the spindle frame 14 to surround the periphery of the frontage of the cartridge case 8a.

A case will be described in which the cartridge 8 is loaded into the magnetic disk tA'Fl configured as described above and used.

In the cartridge case 8a of the Naori-tridge 8, when the cartridge 8a is not in use, a disk hub 8b which also serves as an armature is fixed to the inner bottom surface of the cartridge 8a by a clamp mechanism, and a disk hub 8b is fixed to the inner bottom surface of the cartridge 8a by a clamp mechanism. Correspondingly, a frontage portion is formed on the side surface of the cartridge 8a,
Usually, the opening is closed with stripes and ivy.

First, the front rR3 is opened and the cartridge 8 is inserted into the cartridge space 9. However, one side of the cartridge case 8a comes into contact with the gasket 10, and at the same time, the shutter of the cartridge 8 is opened by the action of a bottle or the like.

Front f? 3 is tightened, the cartridge case 8a is lowered by an unillustrated reeding mechanism, the bottom of the case 8a is brought into contact with the spindle frame 14, and the center of the cartridge case 8a (2) is closed by the gasket 16, and the periphery of the formed opening is !Sealed.

In this state, the spindle shaft 13a of the spindle motor 13
is connected to the disk hub 8b, and is in a state where it can rotate integrally with the magnetic disk 8C with the disk hub 8b floating in the case 8a.

In response to this opening/closing operation, the shutter plates provided at the frontages 4a, 4b of the partition wall 4 open, and 'g! 7 communicates with the opening of the cartridge case 8a.

Next, when the spindle motor 13 is rotated, the magnetic disk 8C rotates. The rotation causes an air flow in the same direction as the rotation direction as shown by the arrow, and the air inside the cartridge case 8 flows into the magnetic head chamber 7 through the opening 4a while rotating in a spiral shape. The air flowing into the cavity 7 is purified by the air filter 6, and one forms a first air flow path that circulates back into the cartridge case 8 from the opening 4b.

At the same time, the air that has passed through the air filter 6 and been purified passes through a conduit 7a extending from the magnetic head chamber 7, further passes through an air circulation hole 15 formed in the spindle frame 14, and then exits from the opening in the inner bottom surface of the cartridge case 8a. A second air flow path flowing into the case 8 is formed. At this time, since the gasket 16 is disposed on the upper surface of the spindle frame 14 so as to surround the periphery of the frontage of the cartridge case 8a, this second air flow path is cut off from the cartridge chamber 9. There is no risk of contamination entering. Moreover, the second air flow path allows purified air to efficiently flow into the center of the cartridge case 8a in large numbers due to the negative pressure generated by the centrifugal force caused by the rotation of the magnetic disk. Since a good air flow is generated outward from the cartridge 8 against the centrifugal force caused by the rotation of the magnetic disk, contaminants that have entered the cartridge 8 are quickly and reliably filtered out.

Then, after a predetermined period of time, the magnetic head 5 enters the cartridge case 8a, is supplied to the surface of the magnetic disk 80, and starts reading data. At this time, the air flow is between the chamber 7 side and the cartridge! Since the flow is from the 9 side, there is no imbalance in the airflow.

After the access operation by the magnetic head 5 is completed, the magnetic head 5 is fixed within the chamber 7. If you close the front door 3 in this state,
At the same time as the openings 4a and 4b of the partition wall 4 close, the cartridge rises from the state shown in the figure, and the disk hub 8b seats on the inner bottom surface of the cartridge case 8a, closing the lower opening, and in this state, the housing is removed by an ejector mechanism (not shown). It jumps out to the -m part of. If the front door 3 is closed after the cartridge 8 is removed, the inside of the cartridge 9 is maintained in a normal state again.

(Effects of the Invention) As explained above, the present invention provides the first magnetic head that flows from the magnetic head chamber into the cartridge case. By forming a second air flow path and creating a good air flow inside the cartridge case, it is extremely practical because it can reliably and quickly remove contaminants from the surface of the magnetic disk, which was previously difficult to remove. This is a valuable invention.

Furthermore, the present invention does not use any movable parts to take such measures against contamination, so the mechanism is simple.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a cartridge type magnetic disk device according to the present invention, and FIG. 2 is a sectional view thereof. 1... Housing body 2... Cover 3... IyJ door 4... Partition wall 5... Magnetic head 6... Air filter 7... Air 7a... Conduit 8... Magnetic Disk cartridge 8a...Cartridge case 81)...Disk hub 8C...Magnetic disk 13...Spindle motor 14...Spindle frame 15...Air? Through hole 16...Packing

Claims (1)

[Claims] (1) A cartridge-type magnetic disk device in which a cartridge-type magnetic disk is characterized in that a filter is provided at an air inflow opening from the cartridge to a magnetic head chamber, and purified air flowing out from the filter is communicated with a central opening of the cartridge. Device.