JPS63195893A - Fixed magnetic disk driver - Google Patents

Abstract

PURPOSE:To make it possible to use the titled device at a low atmospheric environment by providing the device with a pressure sensor for detecting atmospheric pressure in a closed container and a bumb sealing high pressure gas in it. CONSTITUTION:When the fixed magnetic disk driver is used in an extremely low atmospheric environment such as a vacuum state, gas is slightly leaked from a filter cover packing 14 or the like. The atmospheric pressure in a disk enclosure is measured by the pressure detector 19. When the output of the detector 19 is dropped from a level corresponding to 5,000m height e.g. an electromagnetic valve 20 is opened by an output from the detector 19 and gas is fed from the bumb 31 into the disk enclosure through a joint 18 and a filter 117. When the output of the detector 19 exceeds one atmospheric pressure, the valve 20 is closed to prevent the inside of the disk enclosure from being excessively boosted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention aims to expand the permissible usage environment of a fixed magnetic disk drive used as an external storage device for a computer.

(Prior Art) FIG. 4 is a schematic plan view of a conventional head floating type magnetic disk drive device, and FIG. 5 is a cross-sectional view of the same device.

In FIGS. 4 and 5, 1 is a magnetic disk;
It is integrally fixed to a shaft 8 which is given freedom of rotation only on one axis by a ball bearing 10.

Reference numeral 2 denotes a magnetic signal recording/reproducing head, which is coupled via a gimbal 3 and an arm body 4 to an arm shaft 5 which is given a degree of freedom only in rotation by means of a ball bearing 7.

Furthermore, as shown in FIG. 4, when the magnetic disk is rotating, the head gap f between the head 2 and the magnetic disk 1 is such that the air 23 in the disk enclosure 11 is
It is prepared for reading signals on the magnetic disk or writing new signals on the magnetic disk in a state where it floats by a certain amount due to the flow as shown by the arrow in FIG. 6.

The air 23 inside the disk enclosure is connected to the outside air through a small hole h in the disk enclosure lid 13, a filter 17, and a small hole i in the filter holder 15.

Seals 6 and 9 prevent air from flowing between the ball bearing holder and the enclosure.

Next, the operation of the above conventional example will be explained.

FIG. 6 is a schematic diagram showing the relative relationship between the head and the magnetic disk.

In FIG. 6, when the magnetic disk 1 is not rotating, the head 2 is brought into close contact with the magnetic disk 1 by a force in the direction of arrow C generated by the spring force of the gimbal 3.

In this state, when the disk 1 is rotated in the directions of arrows a and a', the force of arrow d is generated on the head 2 by the gimbal 3.
Head 2 remains stopped.

Therefore, the surface of the head 2 facing the magnetic disk 1 and the magnetic disk 1 have a relative speed. If this relative velocity is V, then the air layer adhering to the disk also has an average relative velocity of {circle around (2)} with respect to the head, causing the head 2 to fly.

The minimum flying height of the head 2 is determined by the head slider area (area of the part that comes into close contact with the disk when the magnetic disk is stopped) as S, the relative speed of the air layer attached to the magnetic disk to the head slider as V, and The head load is W,
If the atmospheric pressure is P, it is expressed as, and if the temperature t is constant, f (+) = constant ... (2
), and (1) is expressed as , where D is inversely proportional to the square root of the atmospheric pressure P.

That is, as the pressure decreases, the gap D between the head 2 and the magnetic disk decreases, and conversely, as the pressure P increases, the gap D also increases.

In these conventional fixed magnetic disk drive devices, the air inside the disk enclosure 11, which is a container enclosing the magnetic disk and the head, is connected to the outside air through the filter 17 as described above. The air pressure inside and outside is equal.

In an environment where the atmospheric pressure of the outside air is normal, the conventional fixed magnetic disk drive device fully exhibits its functions and there are no problems with its use.

(Problems to be Solved by the Invention) However, when the conventional device is used in a low-pressure environment equivalent to an altitude of 10,000 to 20,000 meters or more, the gap D becomes too small, and slight irregularities on the magnetic disk cause the head to This has the disadvantage that it causes contact between the magnetic disk and the magnetic disk, making normal operation impossible.

The present invention solves these conventional problems and provides a fixed magnetic disk drive that can be used in environments with lower atmospheric pressure.

An example of an environment with extremely low atmospheric pressure is near-vacuum space, and by implementing the present invention, a fixed magnetic disk drive device can be used even in such an environment.

(Means for Solving the Problems) 4. In order to achieve the above object, the present invention isolates the air inside the disk enclosure from the outside air, and connects a cylinder, an IT water pump, or other device to the disk enclosure. A power device that sends gas, a pressure detection means in the disk enclosure, a circuit section that processes the signal from the pressure detection means, and an output from this circuit section that turns ON and OFF.
It is equipped with pressure control means, such as a power switch for a pump that is turned off, or a solenoid valve provided at the cylinder discharge port.

(Function) The present invention has the following effects due to the above configuration.

In other words, when the disk enclosure of the fixed magnetic disk drive according to the present invention is placed in an extremely low pressure environment, the air pressure inside the disk enclosure is maintained at an appropriate level because the flow of outside air and air inside the disk enclosure is blocked. maintained and does not affect operation.

However, if a fixed magnetic disk drive is left in an extremely low pressure environment for a long time, a small amount of air will leak from the bearing seal or disk enclosure lid seal, and the internal pressure of the disk enclosure will gradually increase. is coming down.

When the pressure inside the disk enclosure drops to a preset value, the signal from the pressure detector inside the disk enclosure or the space connected inside the disk enclosure is guided to the signal processing circuit, and the output of the signal processing circuit is connected to the cylinder. Open the solenoid valve installed between the disk enclosures to send air into the disk enclosures.

When the internal pressure of the disk enclosure rises to a preset pressure, a signal from the pressure detector causes the output of the signal processing circuit to close the solenoid valve.

As described above, according to the present invention, it is possible to realize a fixed magnetic disk drive device that can be used in an extremely low pressure environment for a long time.

(Example) FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

In FIG. 1, 1 is a magnetic disk, 4 is an arm body, and 5 is a magnetic disk.
is the head drive arm shaft, 14 is the filter lid backing, 16 is the check valve, 18 is the joint, 19 is the pressure detector, 20 is the solenoid valve, 21 is the cylinder, 24 is the circulation filter in the disk enclosure, and 27 is the dryer. 115 is a ventilation device, and 117 is a filter.

Next, the operation of the above embodiment will be explained.

In FIG. 1, a cylinder 21 stores high-pressure gas therein, and an electromagnetic valve 20 opens and closes the gas outlet.

The desiccant layer 27 absorbs moisture in the air coming out of the cylinder 21. The joint 18 connects the block including the cylinder 21, the desiccant layer 27, and the electromagnetic valve 20 to the ventilation device 115 for connecting the disk enclosure of the fixed magnetic disk drive to the outside air with one touch.

Gas 12 sealed in the disk enclosure at normal pressure
No. 3 has no active gas passage between the inside and outside of the disk enclosure, so it can be used without any problem even if the device is placed in an extremely low pressure environment.

However, if the fixed magnetic disk drive according to the present invention is used for a long period of time in an extremely low pressure environment such as in a vacuum, the disk enclosure lid backing 12, the filter lid backing 14, or the seal 6.9 may be slightly damaged. Yes, but gas is leaking out. As the gas within the disk enclosure leaks out, the air pressure within the disk enclosure also decreases.

FIG. 2 is a block diagram of the pressure detection portion of the fixed magnetic disk drive according to the present invention.

The atmospheric pressure inside the disk enclosure is measured by a pressure detector 19, but when the detector output drops beyond a point corresponding to an altitude of 5,000 m, for example, the solenoid valve 20 is opened by the output of the control circuit 25. He then sends gas from the cylinder 21 and from the joint 18 through the filter 117 into the disk enclosure.

When the output of the pressure detector 19 exceeds 1 atm, the solenoid valve 20 is closed to prevent the internal pressure of the disk enclosure from rising excessively.

FIG. 3 is a cross-sectional view of a fixed magnetic disk drive according to the present invention.

Here, 2 is the head, 3 is the gimbal, 4 is the arm body, 5
is the arm shaft, 6 is the seal, 7 is the ball bearing, 8 is the shaft, 9 is the seal, IO is the ball bearing, 11 is the disk enclosure,
12 is a disk enclosure lid backing, 13 is a disk enclosure lid, and 123 is a gas inside the disk enclosure.

As described above, according to the above embodiment, the fixed magnetic disk drive device can be used in an extremely low pressure environment such as at high altitude or in outer space, and furthermore, the disk enclosure can be used in an environment where gas leaks during long-term use. By making it possible to compensate for the drop in internal pressure, this has the effect of expanding the usage environment of the fixed magnetic disk drive.

(Effects of the Invention) As is clear from the above embodiments, the present invention is configured so that the gas inside the disk enclosure of a Winchester type fixed magnetic disk drive is not connected to the gas outside the disk enclosure. This has the advantage that it can be used even in environments where the air pressure outside the disk enclosure is low, such as in a vacuum.

Furthermore, since it has a means for measuring the internal pressure of the disk enclosure and a means for replenishing gas that is controlled based on the measurement results, it is possible to use the fixed magnetic disk drive device in an extremely low pressure environment for a long period of time. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram of the pressure detection portion of the fixed magnetic disk drive according to the present invention, and FIG. 3 is a cross-sectional view of the fixed magnetic disk drive according to the present invention. 4 is a schematic plan view of a conventional head floating type magnetic disk drive, FIG. 5 is a cross-sectional view of a conventional head floating type magnetic disk drive, and FIG. 6 shows the relative relationship between the head and the magnetic disk. FIG. 1...Magnetic disk, 2...Head, 3...Gimbal, 4...Arm body, 5...Arm axis,
6,9...Seal, 7.10...Ball bearing,
8... Axis, 11... Disk enclosure, 12... Disk enclosure lid backing, 13
... Disc enclosure lid, 14... Filter lid backing, 15... Filter holder, 16.
...Check valve, 17... Filter, 18...
・Joint, 19...Pressure detector, 20...Solenoid valve, 21...Cylinder, 23...Air inside disk enclosure, 24...
Circulation filter in disk enclosure, 25...
Control circuit, 27... Desiccant layer, 115... Ventilation device, 117... Filter, 123... Disk enclosure internal gas. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 et al. 1 - Magnetic disk 41. -Em bowl 5-Arm glaze 141. - Filter l..., Canog 1G - Check valve 18 - Joint + 19 - Pressure detector 20 - Solenoid valve 21 - Horn'\. 24-, Encroso r same shield filter 27
,] and the Meyaku punishment layer 115. -n Kuogi Jt I47. . Filter Figure 2 U 21. -He Sodo 3゜6. 4. , Armi book 5,,, 7-arm axis 6-1. Seal 7-Ball bearing 8, -Shaft 9-, -"Y-Role 10-Ball bearing 1 - Tee-included enclosure claw 2 piece 12-, Tee-included enclosure buoy 1 part 6. Ang 1
32. - Envelope V 123 with a tie, - Nine arms inside the square arm body 510 with nine inkstones. Finished axis + 3-, Te'1 person enclosure To 1,7 door 3-Zone wheel 4,,,7-1 mui book 5-Arm shaft 6-1-Seal 7-Royal shaft intersection 80
．． Axis 9. -Non-ru 10. -Ball bearing +1. ．． ．． Disc electronic closure +2-, electronic closure lid with a tie I\°tsunku'13-, enclosure with a tie 14-1. The filter lid is closed.

Claims (1)

[Claims] In order to prevent damage to the magnetic read head and magnetic disk caused by dust, etc., the Winchester type fixed magnetic disk drive device operates with the magnetic read head and magnetic disk sealed in a sealed container. A fixed magnetic disk drive device comprising a pressure sensor for detecting pressure and a device for feeding gas into a closed container, such as a cylinder containing high-pressure gas.