JPH02103785A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce the power consumption and heat generation by combining and using a circulating filter and a filmy structure (balloon). CONSTITUTION:A filter flow 72 flowing into a circulating filter 18 scarecely flows by the resistance of the circulating filter for a while after the start of a device. During this period, most of the air flow flows into a balloon 15 from an inflow port and expands the balloon 15 to lift a fixing bar 16, and the pre- load of a pre-load spring 17 is released. After the air flow expands the balloon 15, a static pressure equal to the static pressure to keep the balloon 15 expanded is generated in the inflow port, and the dynamic pressure is reduced, and an air current 73 flowing to the inflow port out of all air flows is reduced. Consequently, the filter flow 72 mainly flows with respect to air currents. Thus, the power consumption and heat generation of the electromagnetic device are reduced without degrading the collection efficiency of dust generated in the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure for fixing an actuator of a magnetic disk device during non-operation.

[Conventional technology]

Conventionally, in order to fix an actuator, a method has been known in which a spring is directly attached to the actuator and the spring is used to fix the actuator during non-operation and to perform traction of the actuator.

Another method involves inserting a wind receiver that rotates in conjunction with the actuator between the disks, and using the force of the air flow accompanying the rotation of the disk and the wind receiver to fix the actuator. was known.

Further, FIG. 6 is a main sectional view showing a conventional magnetic disk device. Conventionally, the actuator 62 was fixed by a preload spring 67 of an electromagnetic device 68 when not in operation. The electromagnetic device 68 has an actuator 62, a fixed tool 66 for fixing, a preload spring 67 for applying a preload force, and a movable iron core 65 for pulling the fixed rod 66 after the power is turned on. When this happens, the movable iron core 65 is pulled, and the actuator 62 is free to roar in a known magnetic disk device.

[Problem to be solved by the invention]

However, the conventional technology had the following problems.

1) 1- with l of external force due to spring or J wind force
It is necessary to give a difference in the current to be applied to the actuator/motor during rack movement control, and 2) overshoot becomes large during settling when switching from track movement control to follow-up control due to the influence of external forces such as springs or wind force.
The settling time became longer.

3) Circuit configuration to correct the effects of springs and wind force,
Or an algorithm was needed.

4) When applying an external force using a spring or wind force, the natural frequency of the spring or wind receiver caused a single point on the machine that was harmful to control.

5) When using an electromagnetic device, it is necessary to continue supplying current to the electromagnetic device even during normal operation, resulting in large power consumption and large heat generation.

Therefore, in order to solve such problems, the present invention has the following features:
By drawing the airflow generated by the rotation of the spindle motor after power is turned on into the balloon and releasing the preload force of the preload spring, it eliminates all the negative effects of external forces caused by the springs and wind force of conventional magnetic disk drives, and also eliminates splashes and It is an object of the present invention to provide a disk device that can completely eliminate the problem of the natural frequency of wind receiving, and also completely eliminate power consumption and heat generation for releasing preload.

[Means to solve the problem]

A magnetic disk device of the present invention includes at least one magnetic disk, at least one magnetic head corresponding to the magnetic disk, a spindle motor for rotating the magnetic disk, an actuator system for supporting the magnetic head, and an actuator system for supporting the magnetic head. A magnetic disk device comprising a voice coil motor for driving an actuator system, a preload spring for fixing the actuator system when the magnetic disk device is not in operation, a fixing rod for fixing the actuator system, and the magnetic disk device. The present invention is characterized by comprising a membrane structure (balloon) that releases the preload force of the preload spring during operation, and a structure that takes in air flow during operation.

〔Example〕

FIG. 1 is a main plan view showing an embodiment of the magnetic disk device of the present invention during operation.

Immediately after power is turned on, the magnetic disk 11 is rotated in the direction of arrow 71 by a spindle motor (not shown). The structure 19 that takes in the airflow serves as a circulation filter frame and an airflow inlet (neither of which is shown in the figure, but shown in FIG. 3), and the airflow generated by the rotation of the magnetic disk 11 is are an air flow 72 flowing into the circulation filter 18 (hereinafter referred to as a filter flow) and an air flow 73 flowing into an air flow inlet (hereinafter referred to as an inlet flow 5).
and an air flow that does not flow into these air flows (hereinafter referred to as other air flows) 74. The filter flow 72 hardly flows for a while after the magnetic disk drive is started due to the resistance of the circulation filter 18.

During this time, most of the air flow flows into the balloon 15 from the inlet, inflating the balloon 15, lifting the fixed rod 16, and releasing the preload force of the preload spring 17. Here, after the airflow inflates the balloon 15, a static pressure is created at the inlet that is the same as the static pressure that keeps the balloon 15 inflated, and the dynamic pressure decreases. That is, as known from Hernoulli's theorem, among all air flows, the inlet flow 73 decreases.

Therefore, since the air flow is mainly the filter flow 72, it is possible to capture dust particles, which is the original purpose of the 1Jlfi ring filter 18.

When the fixing rod 16 is locked by the air flow, the magnetic spatula I.10, which is supported by the actuator 12 and fixed to the pivot shaft, is driven by the voice coil motor 13, which is the driving source, to move the magnetic disk 11 to the desired position. position.

As described above, by using the present invention, by utilizing the resistance of the iFi ring filter to the air flow, the electromagnetic device of the conventional magnetic disk device can be used without reducing the dust collection efficiency of the dust generated in the magnetic disk device. Not only is it possible to eliminate the power that was being consumed, but it is also possible to eliminate the heat generated by the electromagnetic device.

Furthermore, the effects of the present invention are tremendous, such as making it possible to eliminate the electric circuit on the board that controls the electromagnetic device.

FIG. 2 is a main plan view showing an embodiment of the magnetic disk device of the present invention when it is not in operation.

The magnetic head 20 is supported by an actuator 22 and fixed to a pivot shaft 24, and is driven by a voice drive source.
The coil motor 23 positions the magnetic disk 21 at a desired position.

Unlike when a stepping motor is used as a drive source, the voice coil motor 23 has no detent torque when not in operation, so the actuator system (magnetic head 20, actuator 22, voice coil motor 23, pivot shaft 24) must be fixed.

This is for data protection (data reliability) on the magnetic disk 21, and is a shipping area (not shown) where data is not normally read or written during non-operation.
This is for fixing the magnetic head 21 to. When not operating,
The balloon 25 is in a deflated state, and the actuator system is fixed via the fixing rod 26 by the preload force of the preload spring 27.

When the power is turned off, the spindle motor (not shown) of a magnetic disk drive gradually slows down.
Finally it stops. At this time, take the spindle motor (=
The air flow generated by the rotation of the magnetic disk 21 which is being pushed out also gradually weakens and eventually disappears. As the airflow becomes weaker, the balloon 25 begins to deflate, and the preload force of the preload spring 27 becomes twice the force pushing the fixing rod 26 due to the expansion of the balloon 25. Immediately after turning off the power. If the magnetic head 20 is moved to a shipping area (not shown) in advance, the actuator system will be quietly and securely fixed as the spindle motor decelerates.

Therefore, by using the present invention, it is possible to unlock the actuator system during operation, reliably lock the actuator system during non-operation, and lock the actuator system during non-operation, which makes it possible to lock the actuator system during non-operation. A device (IF) equivalent to the electromagnetic device (see Figure 6) used in

That is, by using the present invention, it is not only possible to eliminate the supply of current to the conventional electromagnetic device, thereby making it possible to create a magnetic disk device with low power consumption, but also to eliminate the control circuit for the conventional electromagnetic device. The effects of the present invention are tremendous, such as the ability to reduce costs.

FIG. 3(a) is a front view showing an embodiment of a structure for taking in airflow in a magnetic disk device of the present invention, and FIG.
b) is a plan view showing an embodiment of a structure for taking in airflow in a magnetic disk device of the present invention; The structure 32 for taking in the air flow of the present invention is a frame that integrates the frame of the circulation filter 3 and the frame of the air flow inlet 33, and utilizes the pressure loss of the circulation filter 31 to transfer the air flow to the inlet 33. It has a structure that guides airflow efficiently. Further, the airflow flowing into the inlet 33 is sent through the tube 34 to a balloon (not shown, see FIG. 1), inflating the balloon.

Immediately after the magnetic disk drive is started, most of the airflow flows toward the inflow port 33 due to the resistance of the circulation filter 31, but when the airflow finishes inflating the balloon, the airflow flows toward the inflow port 33.
3 is pressurized and the air flow no longer flows from the inlet 33. Therefore, after the balloon is inflated, a large amount of airflow flows to the circulation filter 31, and the collection of dust particles floating in the magnetic disk device starts. Therefore, by using the present invention, it is possible to unlock the actuator without reducing the efficiency of collecting dust particles.

FIG. 4 is a main sectional view showing an embodiment in which a part of the balloon of the magnetic disk device of the present invention is used as a circulation filter. In this case, the circulation filter at the airflow inlet is removed, and the circulation filter 42 becomes part of the balloon assembly. The airflow flowing into the airflow inlet is sent from the inlet through the tube 45 and into the balloon 41 . Due to the resistance of the circulation filter, the balloon 41 expands,
j When a pressure greater than the resistance of the circumferential filter is applied to the balloon 41, the balloon 41 stops expanding.

At this time, the actuator system fixed by the preload spring 43 is unlocked, and the airflow flowing out from the circulation filter 42 portion of the balloon 41 is purified.

Therefore, by using the present invention, the power consumption and heat generation of the conventional electric 611 device can be completely eliminated, and the power consumption of the magnetic disk device can be reduced. It becomes possible to reduce the number of tracks, and the effects of the present invention are tremendous.

Further, in FIG. 4, a t-ring filter is used only in a portion of the balloon 41, but it goes without saying that similar effects can be obtained even if a circulating filter is used in several locations on the balloon 41.

FIG. 5 is a main sectional view showing an embodiment in which the entire balloon of the magnetic disk device of the present invention is used as a circulation filter.

The circulation filter at the air flow inlet has been removed, and the circulation filter (51) is now the balloon 51 itself. The airflow flowing into the airflow inlet is transferred from the inlet to the tube 55.
It passes through and reaches balloon 51. Since the balloon 51 is a J circumferential filter, the airflow reaching the balloon 51 is expanded due to the resistance of the circulation filter, and the airflow reaches the balloon 51.
When the pressure applied to the filter reaches the point where it overcomes the resistance of the circulation filter, the balloon 51 stops expanding. Balloon 5=
12 1 releases the preload force of the preload spring 53 and separates the fixed rod 54 from the actuator system. In addition, since the expanded balloon 51 is a circulating filter material, the balloon 51
The pressure above a certain pressure within the magnetic disk drive passes through a circulation filter as an air flow and circulates within the magnetic disk drive.

In other words, by using the present invention, the space of the electromagnetic device of a conventional magnetic disk device can be utilized as a circulation filter, making it possible to make the device more compact.Second, the surface area is larger than that of a conventional circulation filter. This has the effect of improving dust collection efficiency.

Furthermore, it goes without saying that the present invention has the effect of eliminating power consumption and heat generation of conventional electromagnetic devices.

〔Effect of the invention〕

As described above, according to the present invention, by using a circulation filter and a balloon in combination, the actuator is not subjected to any external force during operation of the magnetic disk drive. Since there is no difference in current depending on the access direction, control becomes easier.

2) )・There is a large overshoot during settling when switching from rack movement control to 1-rack following control, and there are differences depending on the direction of access.The settling time is extremely short, and the access time between tracks is short. It is possible to shorten the length.

3) From 1) and 2), the external force correction means is not required, the circuit can be simplified, and the control can be stabilized.

4) Since springs and wind guards connected to the actuator are no longer required, the actuator can be made smaller, simpler, and more rigid.
It allows for lower inertia and weight reduction, raises the mechanical resonance point that is harmful to control, expands the usable servo band, facilitates the design of control circuits, enables the use of inexpensive parts, and improves accessibility. - Enables time reduction.

5) Since it is possible to omit the conventional electromagnetic device, it is possible to reduce power consumption by eliminating the power consumed by the electromagnetic device. The heat generation of the equipment is reduced, and thermal off I/rack can be reduced. Furthermore, since a control circuit for the electric device 611 is not required, it is possible to further reduce costs.

As described above, the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a main plan view showing an embodiment of the magnetic disk device of the present invention during operation. FIG. 2 is a main plan view showing an embodiment of the magnetic disk device of the present invention when it is not in operation. FIG. 3(a) is a front view showing an embodiment of a structure for taking in airflow in a magnetic disk device of the present invention. FIG. 3(b) is a plan view showing an embodiment of a structure for taking in airflow in a magnetic disk device of the present invention. FIG. 4 is a main sectional view showing an embodiment in which a part of the balloon of the magnetic disk device of the present invention is used as a circulation filter. FIG. 5 is a main sectional view showing an embodiment in which the entire balloon of the magnetic disk device of the present invention is used as a circulation filter. FIG. 6 is a main sectional view showing a conventional magnetic disk device. 10...Magnetic head 11...Magnetic disk 12...Actuator 13...Voice coil motor] 4...Pivot shaft 15...Balloon 16...Fixing rod 17...Preload spring 18...Circulation filter 19...Structure for taking in air flow 71...Rotation direction of spindle motor 72...Filter flow 73...Inlet flow 74...Other air flow 20...・Magnetic head 21...Magnetic disk 22...Actuator 23...Voice coil motor 24...Pivot shaft 25...Balloon 26...Fixing rod 27...Preload spring 28... Circulation filter 29... Structure 31 for taking in air flow... Circulation filter 32... Structure 33 for taking in air flow... Air flow inlet 34... Tube 41... Balloon 42...・Circulation filter 43...Preload spring 44...Fixing rod 45...Tube 51...Balloon 53...Preload spring 54...Fixing rod 55...Tube (circulation filter) 60... Magnetic head 61...Magnetic disk 62...Actuator 63...Voice coil 64...Pivot shaft 65...Movable core 66...Fixed rod 67...Preload spring 68...Electromagnetic device ·motor

Claims (4)

[Claims] (1) At least one magnetic disk, at least one magnetic head corresponding to the magnetic disk, a spindle motor that rotates the magnetic disk, an actuator system that supports the magnetic head, and a voice that drives the actuator system. - In a magnetic disk device comprising a coil and a motor, a preload spring for fixing the actuator system when the magnetic disk device is not in operation, a fixing rod for fixing the actuator system, and a preload spring for fixing the actuator system when the magnetic disk device is in operation. A magnetic disk device characterized by having a membrane structure (hereinafter referred to as a balloon) that releases a preload force and a structure that takes in an air flow during operation. (2) The magnetic disk drive according to claim 1, wherein the structure that takes in the air flow serves as a frame of the circulation filter and an inlet for the air flow. (3) The magnetic disk device according to claim 1, further comprising a circulation filter in at least a portion of the balloon. (4) The magnetic disk device according to claim 1, wherein the entire balloon serves as a circulation filter.