JPH03214475A - magnetic disk drive device - Google Patents

Abstract

PURPOSE:To always hold a flexure at a constant position by mounting a flexure pressing part which presses the flexure in the direction of a magnetic disk at a supporting arm separately from a carriage arm which supports the flexure. CONSTITUTION:A flexure pressing member 10 returns a wire rod made of shape memory alloy to shape stored in advance by squeezing to V-shape and energizing the member 10. Then, the member 10 squeezes a bias flat spring 7 on the flexure 1, and the flat spring 7 is abutted via the flexure 1, which squeezes the flexure 1 to a magnetic disk 6 side. Next, after the flat spring 7 and the flexure 1 are squeezed to a prescribed position, the resultant force of positive pressure which pushes up the flexure from the disk 6 generated in a slider 3 and a force by which the flexure tries to separate the slider 3 from the disk 6 is generated. The slider 3 can keep a constant interval between the disk 6 where such resultant force is balanced with a force to pull the slider to the disk 6 with the negative pressure of the disk 6, and a stable floating state is kept without making the slider 3 bring into contact with the disk 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk drive device.

A conventional magnetic disk drive apparatus records and reproduces data with a slider having a magnetic head slightly raised above the surface of the magnetic disk. This slider flies above the magnetic disk surface by an airflow generated above the magnetic disk surface.

A contact stop-start method is used as a loading method for conventional magnetic disk drive devices. In the contact stop start method, the magnetic disk begins to rotate at startup, and the number of rotations of the magnetic disk reaches a certain number of rotations, and the slider flies up due to the air flow above the magnetic disk, and continues until it leaves the magnetic disk. , the number of rotations of the magnetic disk becomes smaller than the predetermined number of rotations immediately before stopping, and from the time the slider descends onto the magnetic disk until the rotation of the magnetic disk completely stops, the slider contacts the magnetic disk and the magnetic It slides against the disk. Therefore, in this method, the slider and the magnetic disk slide against each other when the magnetic disk is started or stopped, so there is a great risk of scratches on the slider or the magnetic disk surface.

Therefore, the slider is kept separated from the magnetic disk from the time the magnetic disk starts rotating until it reaches a predetermined number of rotations, and until the number of rotations of the magnetic disk becomes smaller than the predetermined number of rotations and stops. A loading/unloading method was developed to prevent magnetic disks from sliding.

Next, a conventional magnetic disk drive device equipped with a load/unload method will be described. FIG. 4 is a partially enlarged view showing a conventional magnetic disk drive device. Fourth
In the figure, reference numeral 1 denotes a flexure composed of a plate plate, and the flexure 1 is fixed to a carriage arm 5 that is movable in a direction transverse to a data track recorded on a magnetic disk 6. Reference numeral 2 denotes a cymbal formed by a thin plate provided at the tip of the flexure 1. The cymbal 2 has four radially formed branches, each of which has a constriction. A slider 3 has a magnetic head, and the slider 3 is fixed to the flexure 1 via a cymbal 2. The cymbal 2 is provided to cause the slider 3 to follow the undulations of the magnetic disk 6.

Reference numeral 4 denotes a flexure pressing member made of a wire rod made of a shape memory alloy bent into a V shape, and the flexure pressing member 4 is fixed to the carriage arm 5. The shape of the flexure pressing member 4 is memorized so as to displace the flexure 1 toward the magnetic disk 6 upon shape recovery. Also, flexure pressing member 4
The shape recovery is performed by passing a current through the flexure pressing member 4 and causing the flexure pressing member 4 itself to generate heat. By causing the flexure pressing member 4 to recover its shape in this way, the flexure is pressed and bent toward the magnetic disk 6.
The slider 3 is brought close to the rotating magnetic disk 6, and the slider 3 is floated above the magnetic disk 612. The flexure l1 gimbal 2, slider 3, flexure pressing member 4, and carriage arm 5 constitute a magnetic head support device. In the magnetic disk drive device configured in this manner, the slider 3 and the magnetic disk 6 do not rub against each other, so the slider 3 and the magnetic disk 6 are not scratched.

Problems to be Solved by the Invention However, in the conventional configuration, when this magnetic disk drive device is used in a high-temperature environment, the inside of the magnetic disk drive device is sometimes damaged by the shape memory alloy that constitutes the flexure pressing member 4. The temperature may exceed the shape recovery temperature of In such a high temperature environment, the flexure pressing member 4 always presses and bends the flexure I toward the magnetic disk.

If this state continues for a long time, the flexure l may be deformed. Due to the deformation, when the flexure 1 is pushed and bent by the flexure pressing member 4 and the slider 3 is brought close to the magnetic disk 6 and floated, the slider is loaded with the medium facing surface inclined with respect to the magnetic disk. In some cases, the slider 3 comes into contact with the magnetic disk 6 due to insufficient dynamic pressure, causing a head crash and destroying data.

Further, if the current flowing through the flexure pressing member 4 is cut off after the loading operation of the magnetic disk \ of the slider is completed and the slider floats above the magnetic disk, the flexure pressing member 4 becomes extremely soft. If the magnetic head support device is moved at high speed in this state, the inertia force in the access direction acts on the flexure pressing member 4, causing the flexure pressing member 4 to deform. Then, when the slider 3 is loaded onto the magnetic disk 6 again with the flexure pressing member 4 deformed, the flexure pressing member 4 does not press the center of the flexure L but pushes the end thereof, causing the flexure L to be twisted. As the slider 3 is being pushed and bent in this state, the slider 3 is loaded in an inclined position relative to the magnetic disk 6, and slider 1:3 does not generate sufficient dynamic pressure and comes into contact with the magnetic disk, causing a head crash and data loss. Sometimes it was destroyed.

The present invention solves the above-mentioned conventional problems, and provides a magnetic disk drive device that can prevent deformation of the flexure and always keep the fulcrum at a constant position when pushing and bending the flexure toward the magnetic disk. Let's call it 11th.

Means for Solving the Problems To achieve this object, loading means for pressing the flexure toward the magnetic disk is attached to a support arm separate from the carriage arm supporting the flexure.

Function: With this configuration, the weight of the magnetic head support device can be reduced, and the flexure pressing member can always press the flexure at a fixed position.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings with reference to FIGS. 1 and 2. FIG. 1 is a configuration diagram of an embodiment of the present invention. In FIG. 1, a flexure 1, a cymbal 2, a slider 3, flexure pressing members 4 and 5 are carriage arms, and 6 is a magnetic disk, which are the same as the conventional structure. Reference numeral 7 denotes a bias plate spring which is provided on the side of the flexure 1 opposite to the magnetic disk 6 side so as not to contact the flexure l, and is separated from the flexure l, and is attached to the support arm 8. It is bent in advance in a direction away from the flexure 1. Further, a heat-resistant and insulating sheet 9 is attached to the opposite side of the bias plate spring 7 from one flexure. 1
0 is a flexure pressing member formed by bending a wire made of a shape memory alloy into a V shape, and the flexure pressing member 10 is attached to the support arm 8 so as to be in contact with the seat 9. The flexure pressing member 10 has a shape as shown by the solid line in FIG. 2(B) memorized in advance, and is first memorized in the shape shown by the broken line in FIG. 2(A) (FIG. 2(B)). ), if the temperature of the flexure pressing member 10 itself is raised above a certain level by supplying electricity to both ends of the flexure pressing member 10,
It has a characteristic of returning to the shape shown by the solid line in FIG. 2(B), which was previously noted tε. As a result, when the slider 3 is lowered onto the magnetic disk 6, by adjusting the speed at which the flexure pressing member 10 is raised from the deformation start temperature to the deformation end γ quality, the magnetic disk 61-\\ of the slider 3 is lowered. The speed of descent can be controlled.

Next, when loading and unloading the slider of this embodiment,
Figure 3 shows the operation at the time of loading. The bias plate spring 7 and the flexure 1 are also separated from each other. Next, the flexure pressing member 10 is energized to restore the flexure pressing member 10 to the previously memorized shape. Then, the flexure pressing member 10 presses and bends the bias plate spring 7 into one flexure. In the meantime, the bias plate 7 will flex. Next, when the bias leaf spring 7 presses and bends the flexure to a predetermined position, dynamic pressure begins to be generated on the slider 3, and the slider 3 floats above the magnetic disk 6. At this time, if a negative pressure type slider is used as the slider 3, the resultant force of the positive pressure generated on the slider 3 that tries to push it up from the magnetic disk 6 and the force of the flexure l that tries to separate the slider 3 from the magnetic disk 6 is the magnetic disk The slider 3 maintains a constant distance from the magnetic disk 6 at a position that balances the force acting to attract it toward the magnetic disk 6 due to the negative and positive forces of the magnetic disk 6, and the slider 3 and the magnetic disk 6 maintain stable levitation without coming into contact with each other. can maintain its condition.

As described above, according to this embodiment, since the loading mechanism for the slider 3 is not provided on the magnetic head support device, the weight of the magnetic head support device is reduced, and the mechanical resonance at the magnetic head support position is high. Therefore, the control band becomes wider and the controllability becomes better. Furthermore, since the mass of the magnetic head support device is reduced, access time can be made faster.

Furthermore, even if the temperature inside the magnetic disk drive device becomes higher than the shape recovery temperature of the shape memory alloy while the magnetic disk drive device is operating, the shape memory alloy recovers its shape (74) and pushes the flexure l toward the magnetic disk 6. Excessive load will not be applied to the slider.

Therefore, the slider 3 will not come into contact with the magnetic disk, causing a head crash and destroying data due to a decrease in the flying height of the slider due to an excessive load.

Further, a loading mechanism for a slider made of a shape memory alloy is provided separately from the magnetic head support device, and a loading mechanism for a slider made of a shape memory alloy is provided between the flexure pressing member 10 and the flexure 1 made of a shape memory alloy.
By providing the bias plate 7 that acts in the direction of separating the flexure pressing member 10 from the magnetic disk 6, the shape recording is performed after the loading operation of the slider 3 onto the magnetic disk 6 is completed and the slider floats above the magnetic disk. Even if a high-speed access operation of the magnetic head support device is performed with the current flowing through the shape memory alloy cut off, no inertial force acts on the shape memory alloy, so it does not deform. Therefore, as before, slider 3
After the loading operation on the magnetic disk 6 is completed and the slider floats on the magnetic disk, the shape memory alloy has ε
When the flow is cut, the shape memory alloy becomes soft and
Since the shape memory alloy that has recovered to the previously recorded shape can always be kept in the same shape, even if the slider 3 is loaded onto the magnetic disk 6 again, the shape memory alloy will not change its shape. By pressing the center part of the alloy leaf spring, the flexure will not be twisted, and the slider will be loaded horizontally to the magnetic disk, so it will come into contact with the magnetic disk and cause head lash. , data will not be destroyed.

Furthermore, by providing a heat-resistant insulating sheet between the flexure pressing member 10 and the bias plate bar 7, the slider 3
Even if the magnetic disk is loaded many times, the insulating film of the shape memory alloy is not destroyed, and insulation between the flexure pressing member 10 made of the shape memory alloy and the flexure I can be ensured.

Effects of the Invention The present invention has a flexure pressing member that presses the flexure toward the magnetic disk, which is attached to a support arm that is separate from the carriage arm that supports the flexure.
Even if the operating environment temperature becomes higher than the shape recovery temperature of the shape memory alloy constituting the flexure pressing member, the flexure pressing member does not press and bend the flexure to deform it, as in the conventional case.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the magnetic disk drive device of the present invention, 2 IN is a side view showing changes in operation when used in the same embodiment, and Fig. 4 is a conventional slider loading diagram. and FIG. 6 is a configuration diagram showing an unloading mechanism. ■... Flexure 2... Gimbal 3... Slider 4... Flexure pressing member 5... Gear ridge arm 6...・Magnetic disk 7...Bias plate spring 8...Support arm 9...Heat-resistant insulation sheet 10...Flexure pressing member

Claims (4)

[Claims] (1) A magnetic disk, a carriage arm that moves approximately parallel to the magnetic disk, a flexure attached to the carriage arm, a slider provided on the flexure, and a press of the flexure toward the magnetic disk. What is claimed is: 1. A magnetic disk drive device comprising: a loading means for loading the loader; and a support arm supporting the loading means. (2) a magnetic disk, a carriage arm that moves approximately parallel to the magnetic disk, a flexure attached to the carriage arm, a slider provided on the flexure, and a side of the flexure opposite to the magnetic disk side; a bias leaf spring provided so as to be located at the
A magnetic disk drive device comprising: a pressing member that presses the bias leaf spring toward the flexure; and a support arm that supports the bias leaf spring and the pressing member. (3) The magnetic disk drive device according to claim 2, wherein the pressing member is made of a shape memory alloy. (4) The magnetic disk drive device according to claim 3, characterized in that a heat-resistant insulating sheet is provided on the portion of the flexure that the pressing member comes into contact with.