JPS60202591A - Cartridge magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the mixture of contamination by forming a venthole pierced through inside and outside to a resting standard block and also putting a filter to the venting surface of the venthole. CONSTITUTION:An air current is produced as shown by arrow heads by the revolutions of a magnetic disk 8, and the air put into a cartridge case 8a through an opening 4d formed at the side of a magnetic head 5 is turned spirally and circulated toward a filter 6 via an opening 4a. At the same time, the air is also flowed into the case 8a through a venthole 1b formed within a cartridge chamber 9 as shwon arrow heads. Thus the air is supplied through many ventholes 16 formed to a resting standard block 14 and circulated spirally within the filter 6. Thus the contamination mixed into a cartridge 8 and the chamber 9 are almost filtered. While an air current produced by revolutions is filtered by both filters 18 and 17 and then supplied to a magnetic disk 8c. Thus the contamination can be filtered in a short time.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a cartridge 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.
It is attracting attention as a magnetic recording medium for small computers to replace floppy disks because it can be driven at high speed and the magnetic recording surface can be accessed with a floating magnetic head.

Magnetic disk that drives the magnetic disk cartridge**
The performance required for magnetic disks.

The objective is to minimize the occurrence or intrusion of contamination when the motor 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 disk and the magnetic disk is 0.3μ-90.5.
It floats while maintaining a μ-gap, and if contaminants such as fine dust invade the cartridge case along with the airflow, the written data will be destroyed by damaging the head and recording surface. This may cause a head crash, or an access error.

In order to prevent contamination, conventional magnetic disk drives airtightly divide the inside of the housing into a chamber where the cartridge is stored and a chamber where the magnetic head section is stored, and the cartridge is loaded into the cartridge chamber. When the lid is closed, the shutter plate on the partition wall opens and the magnetic head protrudes into the cartridge case.

However, with such a structure, when the cartridge is inserted into the cartridge chamber and mounted on the drive device, a gap is created at the bottom of the cartridge, allowing air to enter the inside of the cartridge case. Furthermore, since the cartridge chamber is exposed to outside air each time the cartridge is opened or closed, countermeasures against contamination cannot be said to be sufficient.

(Object of the Invention) An object of the present invention is to prevent contamination from entering the cartridge in a state where the cartridge is installed in a drive device.

(Structure of the Invention) In order to achieve the above object, the present invention provides a seat that is arranged concentrically around the outer periphery of the drive device, makes airtight contact with the bottom surface of the cartridge case, and surrounds the outer periphery of the opening of the case. A reference block is provided, an air circulation hole passing through the inside and outside is formed in this seating reference block, and a filter is provided on the circulation surface of the air circulation hole R1.

(Embodiment) FIG. 1 is a plan view of a magnetic disk device according to the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a partially sectional perspective view showing the main parts.

The magnetic disk drive shown in the figure consists of a housing main body 1 having m openings, a cover 2 that airtightly covers the top surface of the housing main body 1, and a cover 3 that covers the side openings in an openable and closable manner. It constitutes the overall shape of.

There are partitions inside the housing! 14 into a chamber 7 in which a magnetic head 5 and an air filter 6 are arranged, and a cartridge 8.
It is airtightly divided into a chamber 9 in which the

Partition I! 4 is formed with an opening 4a that communicates with the air filter 6 and an opening 4b through which the magnetic head 5 enters and exits.These openings 4a and 4b are normally closed by a shutter plate (not shown), and the cartridge 8 is loaded,
It is opened by closing 1lP3, and is opened together with a shutter plate (also 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.

Further, a communication hole 1a is formed in the bottom of the filter 6, and the outside pressure and the pressure inside the chamber 7 are balanced by the communication hole 1a.

Note that 10 is a partition at the periphery of the openings 4a and 4b. 14 is the packing attached, and 11 is the packing installed on the inner surface of the 3.

A drive device, that is, a spindle motor 13 having a magnetic chuck 12 integrally mounted on its upper surface is disposed at the center of the inner bottom surface of the cartridge chamber 9.

A ring-shaped seating reference block 14 is flange-fitted to the flange portion 13b of the spindle motor 13. A gasket 15 is disposed on the periphery of the upper surface of this seating reference block 14, and a large number of air circulation holes 1 are provided on the periphery of the lower part.
6 are formed to penetrate the inner and outer peripheries of the reference block 14. Roughly speaking, an air filter 17 is in close contact with its outer periphery.

Further, inside the cartridge chamber 9, an air circulation hole 1b is formed at the bottom of the housing body 1, and the upper surface of the air circulation hole 1b is covered with a filter 18.

A case will be described in which the cartridge 8 is loaded into the magnetic disk device configured as described above and is driven.

In addition, when the cartridge case 8a of the cartridge 8 is not in use, a disc hub 8b which also serves as an arm drive is fixed to the inner bottom surface of the case 8a by a clamp mechanism, and also corresponds to the openings 4a and 4b of the partition wall. An opening is formed on the side surface of the case 8a, and the opening is normally closed by a shutter.

First, open the vinegar 3 and insert the cartridge 8 into the cartridge chamber 9.
When loaded, 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.

When the legs 3 are closed, the cartridge case 8a is lowered by a lifting mechanism (not shown), the bottom of the case is brought into contact with the seat reference block 14, and the periphery of the opening formed in the center of the cartridge case 8a is sealed by the gasket 15. Ru.

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 openings 4a and 4b of the partition 14 open, and the chamber 7 opens into the cartridge case 8.
It communicates with the opening of a.

Next, when the spindle motor 13 is rotated, the magnetic disk 8C rotates. Due to the rotation, an air flow occurs in the same direction as the rotation direction as shown by the arrow, and the air introduced into the cartridge case 8a from the opening 4b provided on the side of the magnetic head 5 rotates in a whirlpool and flows through the cartridge case 8a.
The air passes through an air flow path (not shown) formed inside and circulates to the filter 6 side via the opening 4a.

At the same time, a communication hole 1 provided in the cartridge chamber 9
Air also flows in from b as shown by the arrow, and passes through the numerous air circulation holes 16 formed in the seating reference block 14 to the lower opening of the cartridge case 8a and the magnetic chuck 1.
2 and circulates inside the filter 6 while drawing a similar spiral. As a result, contamination that has entered the cartridge 8 or the cartridge chamber 9 is largely filtered out. Further, since the air flow generated by the rotation is supplied to the magnetic disk 8G after being filtered by the filters 18 and 17, contamination can be filtered out in a short time.

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 reads and writes data. Since the air flow at this time is from the chamber 7 side and the cartridge chamber 9 side, there is no imbalance in the air flow.

After the access operation by the magnetic head 5 is completed, the magnetic head 5 retreats into the chamber 7. If you open ridge 3 in this state, it will be a partition! 14 openings 4a, 4b, +'jftJ] at the same time, 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. It pops out to one side of the housing by the I-actor mechanism. Cartridge 8
If the lI3 is closed after the cartridge is removed, the inside of the cartridge chamber 9 is kept clean again.

Note that when the device is operated, the temperature inside the chamber 7 and the cartridge chamber 9 rises and the pressure is maintained higher than the outside air, and when the device is cooled, the pressure decreases, but this pressure difference is caused by the #1 air circulation hole 1a. , 1b are kept at the same pressure by circulating air. Therefore, when loading the cartridge 8 into the cartridge chamber 9 next time, even if the jiI 3 is opened, there will be no intake of outside air or pressure imbalance with the chamber 7 side, which will prevent contamination from entering when the cartridge is installed or removed. can. ” Since this invention is configured as described above, (effects of the invention) the inside of the cartridge chamber is maintained in a clean state, and the probability of intrusion of contamination from outside when the cartridge is installed or removed is reduced. Furthermore, the time required to remove contamination can be shortened.

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

[Brief explanation of drawings]

FIG. 1 is a plan view of a cartridge magnetic disk device according to the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a partially sectional perspective view showing essential parts of the present invention. 1... Housing body 2... Cover 3... Door 4... Partition wall 5... ......Magnetic head 7......Chamber 8...Magnetic disk cartridge 8a.
... Cartridge case 8b ... Disk hub 8C ... Magnetic disk 12 ... Magnetic chuck 13 ... Spindle motor 13a ... Spindle shaft 14 Seating reference block 16 Air circulation hole 17 Filter and above Patent applicant Seiko Seiki Co., Ltd. Agent Tsutomu Mogami Figure 3 IFi

Claims (1)

[Claims] (1) By arranging the drive device on the inner bottom surface of the housing that removably accommodates the magnetic disk cartridge, and connecting the disk hub exposed through the bottom opening of the cartridge case to the drive device, the disk hub and disk hub In a cartridge magnetic disk device in which a magnetic disk whose center is fixed at (c) is rotatably held within a cartridge case, the bottom surface of the cartridge case is arranged concentrically around the outer periphery of the drive'#A pupil. A seating reference block is provided that airtightly abuts the case and surrounds the opening periphery of the case, and this seating reference block is formed with an air circulation hole that penetrates inside and out, and a filter is provided on the circulation surface of the air circulation hole. A cartridge magnetic disk device characterized in that: