JPH0660578A - Hard disk device - Google Patents

Abstract

PURPOSE:To prevent a head from being brought into contact with the other head or a disk and to improve reliability by making a floating type magnetic head provided with a negative pressure type slider come close to the magnetic disk or separate from it by the movement of an arm by using a pressing member and loading and unloading it. CONSTITUTION:When the arm 10 positioned by lock mechanisms 12-17 is moved in the direction of the magnetic disk 9, flexures 1 and 2 are pressed by the inclined parts of the pressing members 5 and 6 and made to come close to the surface of the disk 9 by the parallel parts. Therefore, the floating type magnetic heads 3 and 4 are stopped at a position where negative pressure and positive pressure by an air flow generated by the rotation of the disk 9 and the restoring force of the flexures 1 and 2 are balanced by the negative pressure type slider and set under a state that they are loaded. Next, when the arm 10 is moved to the outside circumference side of the disk, the heads 3 and 14 are separated from the surface of the disk 9 and set under the state that they are unloaded. Thus, the contact of the heads 3 and 4 and the contact of the head and the disk are prevented from occurring by a contact preventing member 7 and the reliability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk device.

[0002]

2. Description of the Related Art Conventionally, a floating slider having a magnetic head for recording / reproducing data has been generally used in a magnetic disk device. Then, in order to position the magnetic head on a desired track on the magnetic disk,
The flexure is fixed to the tip of an arm that is movable in the direction transverse to the rotation direction of the magnetic disk, and a floating slider is attached to the tip of the flexure. A positive pressure slider is generally used as the flying slider.

The operation will be described below. When the magnetic disk is stopped, the slider is pressed against the magnetic disk surface with a constant load, and remains in contact with the magnetic disk surface for a while even after the magnetic disk starts rotating. When the rotation of the magnetic disk reaches a predetermined number of rotations, the slider floats while maintaining a position where the positive pressure generated by the air flow generated on the surface of the magnetic disk and the load acting on the slider are balanced. Then, when the rotation speed of the magnetic disk becomes slow, the positive pressure becomes small, and the magnetic disk stops while the slider again contacts the magnetic disk surface. However, when such an operation is performed, the slider and the magnetic disk surface are rubbed with each other, abrasion powder and scratches are generated, and the slider and the magnetic disk are attracted to each other by the water condensed on the surface of the magnetic disk. Therefore, in recent years, a method has been proposed in which a negative pressure slider is used as the flying slider, and the slider and the magnetic disk are floated in a non-contact manner. A magnetic disk device using this negative pressure type slider will be described below with reference to FIG. In FIG. 5, reference numeral 21 is a flexure composed of a leaf spring, and the flexure 21 is a magnetic disk 2
It is fixed to a carriage arm 24 which is movable in a direction traversing the data track recorded on the recording medium 5. The flexure 21 is bent near the carriage arm 24 and fixed to the carriage arm 24 so that a restoring force acts in a direction away from the magnetic disk 25. The gimbal 22 is fixed to the flexure 21 by a gimbal formed by a thin plate provided at the tip of the flexure 21.
2, a slider 23 having a magnetic conversion element is attached. The gimbal 22 is twisted during the rolling motion and the pitching motion of the slider 23, and the slider 23 floats while following the magnetic disk 25. Reference numeral 26 is a load pin provided on the side of the flexure 21 opposite to the magnetic disk 25 side so as not to come into contact with the flexure 21 and apart from the flexure 21, and attached to the support arm 27. When the slider 23 is loaded on the magnetic disk 25, the support arm 27 displaces the flexure 21 toward the magnetic disk 25 by the load pin 26 attached to the support arm 27. The support arm 27 is driven by supplying a current to the solenoid 28 and moving the iron core 29 of the solenoid 28 from the protruding state to the retracted state.

This operation will be described below with reference to FIGS. 6 (a), 6 (b) and 6 (c). In FIG. 6A, the magnetic disk 25
When is not rotating, since the solenoid 28 is not supplied with current, the iron core 29 of the solenoid 28 is in a protruding state, and the load pin 26 and the flexure 21 are in a separated state. Next, when the magnetic disk 25 rotates and reaches a predetermined rotation speed, a current is supplied to the solenoid 28. Then, the iron core 29 of the solenoid 28 shifts from the protruding state to the retracted state, the support arm 27 moves toward the magnetic disk 25, and the load pin 2 attached to the support arm 27 is moved.
FIG. 6B shows a state in which 6 pushes and bends the flexure 21 toward the magnetic disk 25. Further, the flexure 21 is shown in FIG.
In the state of (c), that is, when the magnetic disk 25 is approached to a certain distance, a negative pressure is generated in the slider 23 and the slider 23
Is in a floating state so as to be attracted to the magnetic disk 25. The slider 23 floats above the magnetic disk 25 with a constant gap in a state where the positive pressure and the negative pressure generated in the slider 23 and the restoring force of the flexure 21 are balanced. As described above, the loading operation is performed using the negative pressure type slider.

[0005]

However, in the above-mentioned conventional structure, the iron core 29 is prevented from abruptly shifting from the projecting state to the retracting state by controlling the current supplied to the solenoid 28 and the like, and the load pin 26 is further retracted. The accuracy of the mechanical system is required to keep the spring load value within a certain range.
Moreover, the loading mechanism is complicated, and it is difficult to secure reliability in terms of cost. Further, since the slider 23 is on the surface of the magnetic disk 25 even when the slider is not in operation, the slider 23 and the magnetic disk 2 are affected by external vibration or shock.
There is also a problem that the magnetic disk 25 is scratched and dust is generated, data is destroyed or crashes, and high reliability cannot be ensured.

[0006]

In order to solve the above problems, the present invention comprises a magnetic head having a negative pressure type slider, a flexure for holding the negative pressure type slider, and an arm for holding the flexure and moving on the disk. A pressing member that presses the flexure, a lock mechanism that locks the arm, and a contact prevention member that prevents damage to the negative pressure type slider are provided.

[0007]

According to the present invention, with the above-described structure, the arm is moved to a position where the flexure comes into contact with the pressing member and is pressed, and the lock mechanism of the arm is operated there to lock the arm, so that the flexure is held by the pressed flexure. The negative pressure type slider approaches the surface of the rotating magnetic disk, and the negative pressure type slider generates a negative pressure due to the air flow generated by the rotation of the magnetic disk, and the negative pressure type slider further approaches the magnetic disk surface by the generation of this negative pressure. However, the negative pressure type slider stops at a position where this negative pressure and the positive pressure for separating the negative pressure type slider from the magnetic disk surface and the force for bending the flexure in the direction of the magnetic disk to return to the original state are balanced, It is possible to write data to the magnetic disk and read data from the magnetic disk. When the hard disk drive is stopped, the arm is moved to a position where the negative pressure type slider is disengaged from the surface of the magnetic disk and the arm lock mechanism is operated to lock the arm. At the position where this arm is locked, a contact prevention member is provided between the flexures arranged so as to face each other with the magnetic disk sandwiched between them, so as to prevent contact between the sliders due to external vibration or shock. There is.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3 and 4. FIG. 1 is a perspective view of a main part of a hard disk device according to an embodiment of the present invention, and FIGS. 2, 3 and 4 are diagrams showing an operating state of the present invention.

In FIG. 1, reference numerals 1 and 2 denote flexures for holding a slider, which are formed by bending a leaf spring. Numerals 3 and 4 are flying type magnetic heads attached to the magnetic disk side at the tip of the flexure and provided with negative pressure type sliders. Reference numerals 5 and 6 are pressing members for floating the floating magnetic heads 3 and 4. Reference numeral 7 is a contact preventing member for preventing the floating magnetic heads 3 and 4 from coming into contact with each other in a non-operating state. It is screwed to the holding member. The pressing portion holding member 8 is fixed to a base (not shown). 9
Is a magnetic disk. Reference numeral 10 denotes an arm, which is driven by a voice coil motor (not shown) so that it can move on the magnetic disk about the rotation axis of 11. The flexures 1 and 2 are screwed to the tip of the arm 10. Reference numeral 12 is a fan-shaped coil mold attached to the arm 10 on the side opposite to the flexures 1 and 2 with respect to the rotary shaft 11, and is provided with steps 12a and 12b used when locking the arm 10. 13,
Reference numeral 14 is a solenoid type plunger. The plunger 13 operates 15 lock pins, and the plunger 14 operates 16 lock pins. Reference numeral 17 is a rubber stopper. Stopper 17
Is arranged so that the flexures 1 and 2 come into contact with the coil mold 12 before coming into contact with the pressing portion holding member 8 when the arm is moved in the outer peripheral direction of the magnetic disk 9.

The operation of the hard disk device of this embodiment having the above-described structure will be described below with reference to FIGS. 2, 3 and 4.

FIG. 2 shows a state before the hard disk device is activated.
Shown in (a) and (b). 2A and 2B are a top view and a side view, respectively, of this embodiment. The hard disk device starts to start and the magnetic disk 9 starts to rotate. When the rotation of the magnetic disk 9 is stabilized, the plunger 13 pulls the lock pin 15 to move the arm 10 in the direction of arrow A. When the arm 10 moves in the direction of the arrow A, the flexures 1 and 2 are inclined portions 5a and 6a of the pressing members 5 and 6, respectively.
And the flexures 1 and 2 contact the magnetic disk 9 respectively.
The flexures 1 and 2 are pushed in the direction of
At the portions b and 6b, the floating magnetic heads 3 and 4 approach the surface of the magnetic disk 9, and the lock pin 16 comes into contact with the step 12b of the coil mold 12 as shown in FIGS. The movement of the arm 10 will stop. Figure 3 (a)
(B) is a top view and a side view of the present embodiment, respectively.
The flying magnetic head 3, which is close to the surface of the magnetic disk 9.
Since 4 is provided with a negative pressure type slider, negative pressure is exerted by the air flow generated by the rotation of the magnetic disk 9, and the magnetic disk 9 further approaches the surface of the magnetic disk 9. The floating magnetic heads 3 and 4 have the negative pressure, the positive pressure for separating the floating magnetic heads 3 and 4 from the surface of the magnetic disk 9, and the flexures 1 and 2 which are bent in the direction of the magnetic disk 9. At the position where the force to return to the state is balanced, it stops and becomes the loading state in which the data can be recorded and reproduced. This state is shown in FIGS. 4A and 4B are a top view and a side view, respectively, of this embodiment. When the loading of the floating magnetic heads 3 and 4 is completed, the plunger 14 pulls the lock pin 16 so that the arm 10 can move on the magnetic disk 9. Next, the operation when the hard disk device is stopped will be described. Arm 10
Is moved to the loading position of the floating magnetic heads 3 and 4, the arm 10 is temporarily stopped there, and the plunger 14 pushes out the lock pin 16 and the plunger 13 pushes out the lock pin 15. Next, when the arm 10 is moved in the outer peripheral direction of the magnetic disk 9 until the coil mold 12 contacts the stopper 17, the floating magnetic heads 3, 4 are moved.
Is separated from the surface of the magnetic disk 9 and is in an unloading state. At this time, the contact preventing member 7 does not collide with the levitation type magnetic head 3 and the levitation type magnetic head 4 due to the vibration of the flexures 1 and 2 made of leaf springs during unloading. Coil mold 12 is stopper 17
When it comes into contact with the arm 10, the lock pin 15 enters the step 12a of the coil mold 12 and the arm 10 is locked.

As described above, according to this embodiment, the floating magnetic heads 3 and 4 equipped with negative pressure type sliders are loaded by the movement of the arm 10 by using the pressing member, and the arm 10 is loaded on the outer circumference of the magnetic disk 9. By moving the levitation type magnetic heads 3 and 4 separately from the surface of the magnetic disk 9 to unload the levitation type magnetic heads 3 and 4 without contacting the surface of the magnetic disk 9 with the loading state and unloading. You can move to the state. Further, as shown in FIGS. 2A and 2B, when the hard disk device is not in operation, the contact prevention member 7 provided between the flexure 1 and the flexure 2 causes the floating magnetic head 3 and the floating type magnetic head 3 to float due to external vibration or shock. The contact of the magnetic head 4 can be prevented.

[0013]

According to the present invention, a flying magnetic head equipped with a negative pressure type slider is pushed by a movement of an arm using a pushing member to push a flexure attached to the tip of the flying magnetic head to bring the flying magnetic head closer to the surface of the magnetic disk. By setting the floating magnetic head to the loading state and moving the arm in the outer circumferential direction of the magnetic disk to separate the floating magnetic head from the surface of the magnetic disk and unload it, the load / unload mechanism can be simplified. In addition, the negative pressure type slider is not on the surface of the magnetic disk when it is not in operation, and the contact prevention member is provided between the two flexures arranged so as to sandwich the magnetic disk. When the negative pressure type slider and the magnetic disk come into contact with each other due to external vibration or shock during non-operation, It could prevent contact type slider between, those that can achieve cost of a hard disk drive with high reliability.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a hard disk device according to an embodiment of the present invention.

FIG. 2A is a top view showing the operation of the hard disk device according to the embodiment of the present invention. FIG. 2B is a side view showing the operation of the hard disk device according to the embodiment of the present invention.

FIG. 3A is a top view showing the operation of the hard disk device according to the embodiment of the present invention. FIG. 3B is a side view showing the operation of the hard disk device according to the embodiment of the present invention.

FIG. 4A is a top view showing the operation of the hard disk device according to the embodiment of the present invention. FIG. 4B is a side view showing the operation of the hard disk device according to the embodiment of the present invention.

FIG. 5 is a perspective view of a main part of a conventional hard disk device.

FIG. 6A is a side view showing the operation of the conventional hard disk device. FIG. 6B is a side view showing the operation of the conventional hard disk device. FIG. 6C is a side view showing the operation of the conventional hard disk device.

[Explanation of symbols]

 1 Flexure 2 Flexure 3 Levitation type magnetic head 4 Levitation type magnetic head 5 Pressing member 6 Pressing member 7 Contact prevention member 9 Magnetic disk 10 Arm 12 Coil mold 15 Lock pin 16 Lock pin

Claims (2)

[Claims] 1. A magnetic disk for storing data, a magnetic head for reading data from the magnetic disk and writing data on the magnetic disk, a slider for holding the magnetic head, and a swingable slider. A flexure held by the armature, an arm for holding the flexure and moving on the magnetic disk, a means for locking the arm, and a pressing member fixed at a position where the flexure comes into contact when the flexure is moved, A hard disk device, wherein the flexure portion is brought into contact with the pressing member by moving the flexure so that the slider approaches the surface of the magnetic disk. 2. A magnetic disk for storing data, a pair of arms that are arranged so as to face each other with the magnetic disk sandwiched therebetween, and move on the magnetic disk, and a pair of arms attached to each of the pair of arms. A flexure, a pair of sliders attached to the front magnetic disk side of each of the pair of flexures, a pair of magnetic heads attached to each of the pair of sliders, and a pair of flexures on the magnetic disk surface. And a contact prevention member for preventing contact between the pair of sliders and the pair of magnetic heads when moved to the outside, and when the operation is completed, the pair of flexures are moved to the outside of the magnetic disk surface. A magnetic disk and the magnetic head, the magnetic disk and the slider, the pair of sliders,
And a hard disk drive which prevents contact between the pair of magnetic heads.