JP3616108B2 - Hard disk drive - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hard disk device.
[0002]
[Prior art]
Conventionally, a floating slider having a magnetic head for recording / reproducing data is generally used in a magnetic disk device. Then, in order to position the magnetic head on a desired track on the magnetic disk, a flexure was fixed to the tip of an arm movable in a direction crossing the rotation direction of the magnetic disk, and a floating slider was attached to the tip of the flexure. It has a structure. In general, a positive pressure type slider is used as the floating slider.
[0003]
Hereinafter, the operation will be described. When the magnetic disk is stopped, the slider is pressed against the magnetic disk surface with a constant load, and is in contact with the magnetic disk surface for a while even if the magnetic disk starts to rotate. 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 magnetic disk surface and the load acting on the slider are balanced. When the rotational speed of the magnetic disk becomes slow, the positive pressure decreases, and the magnetic disk stops while the slider contacts the magnetic disk surface again. However, when such an operation is performed, the slider and the magnetic disk surface rub against each other, and wear powder and scratches are generated, and the slider and the magnetic disk are attracted to each other due to moisture condensed on the surface of the magnetic disk. In recent years, therefore, a method has been proposed in which a negative pressure type 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, a flexure 21 is constituted by a leaf spring, and the flexure 21 is fixed to a carriage arm 24 that is movable in a direction crossing a data track recorded on a magnetic disk 25. The flexure 21 is fixed to the carriage arm 24 by being bent near the carriage arm 24 so that a restoring force acts in a direction away from the magnetic disk 25. Reference numeral 22 denotes a gimbal formed by a thin plate provided at the tip of the flexure 21, and is fixed to the flexure 21, and a slider 23 having a magnetic transducer is attached to the gimbal 22. The gimbal 22 is twisted during the rolling and pitching movements of the slider 23, and the slider 23 floats while following the magnetic disk 25. A load pin 26 is provided on the side opposite to the magnetic disk 25 side of the flexure 21 so as not to come into contact with the flexure 21 and is separated from the flexure 21 and attached to the support arm 27. The support arm 27 is configured to displace the flexure 21 toward the magnetic disk 25 by a load pin 26 attached to the support arm 27 when the slider 23 is loaded onto the magnetic disk 25. The support arm 27 is driven by supplying a current to the solenoid 28 to change the iron core 29 of the solenoid 28 from the protruding state to the retracted state.
[0004]
This operation will be described below with reference to FIGS. 6 (a), (b) and (c). In FIG. 6A, when the magnetic disk 25 is not rotating, no current is supplied to the solenoid 28. Therefore, the iron core 29 of the solenoid 28 is in a protruding state, and the load pin 26 and the flexure 21 are separated. State. Next, when the magnetic disk 25 rotates and reaches a predetermined rotational 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 in the direction of the magnetic disk 25, and the load pin 26 attached to the support arm 27 pushes and flexes the flexure 21 toward the magnetic disk 25. The state is shown in FIG. Further, when the flexure 21 is in the state shown in FIG. 6C, that is, close to the magnetic disk 25 to a certain distance, a negative pressure is generated in the slider 23, and the slider 23 floats so as to be attracted to the magnetic disk 25. Then, the slider 23 floats with a certain gap from the magnetic disk 25 in a state where the positive and negative pressures 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]
[Problems to be solved by the invention]
However, in the above conventional configuration, the iron core 29 is not suddenly shifted from the protruding state to the retracted state by controlling the current supplied to the solenoid 28, and the spring load value of the load pin 26 is also within a certain range. In order to achieve this, the accuracy of the mechanism system is required, and the loading mechanism becomes complicated, making it difficult to ensure cost and reliability. Further, since the slider 23 is on the surface of the magnetic disk 25 even when not operating, the slider 23 and the magnetic disk 25 come into contact with each other due to external vibration, impact, etc., and the magnetic disk 25 is scratched and dust is generated. There was also a problem that high reliability could not be ensured due to damage and crashes.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a magnetic head including a negative pressure type slider, a flexure that holds the negative pressure type slider, an arm that holds the flexure and moves on the disk, a pressing member that presses the flexure, A lock mechanism for locking the arm and a contact preventing member for preventing damage to the negative pressure type slider are provided.
[0007]
[Action]
In the present invention, with the above-described configuration, when the arm is moved to a position where the flexure comes into contact with the pressing member and pressed, and the arm is locked by operating the arm locking mechanism, the negative pressure type held by the pressed flexure. The slider approaches the surface of the rotating magnetic disk, and negative pressure is generated in the negative pressure type slider by the air flow generated by the rotation of the magnetic disk. The negative pressure type slider further approaches the surface of the magnetic disk due to the generation of this negative pressure. The pressure slider stops at the position where there is a balance between the negative pressure, the positive pressure to move the negative pressure slider away from the magnetic disk surface, and the force of the flexure bent in the direction of the magnetic disk to return to the original state. The data can be written and the data can be read from the magnetic disk. When the hard disk drive is stopped, the arm is moved to a position where the negative pressure type slider comes off the surface of the magnetic disk, and the arm locking mechanism is operated to lock the arm. At the position where the arm is locked, a contact preventing member is provided between the flexures arranged so as to face each other with the magnetic disk interposed therebetween, so that contact between the sliders due to external vibration, impact, etc. is prevented. Yes.
[0008]
【Example】
An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. FIG. 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 operation state of the present invention.
[0009]
In FIG. 1, reference numerals 1 and 2 denote flexures for holding a slider, which are formed by bending a leaf spring. Reference numerals 3 and 4 are floating type magnetic heads attached to the magnetic disk side at the tip of the flexure, and are provided with a negative pressure type slider. Reference numerals 5 and 6 are pressing members for floating the floating magnetic heads 3 and 4, and 7 is a contact preventing member for preventing the floating magnetic heads 3 and 4 from contacting in a non-operating state. Screwed to the holding member. The pressing portion holding member 8 is fixed to a base (not shown). Reference numeral 9 denotes a magnetic disk. Reference numeral 10 denotes an arm which is driven by a voice coil motor (not shown) and is configured to be able to move on the magnetic disk about the 11 rotation axis. Flexures 1 and 2 are screwed to the tip of the arm 10, respectively. A fan-shaped coil mold 12 is attached to the arm 10 on the side opposite to the flexures 1 and 2 with respect to the rotating shaft 11, and is provided with steps 12 a and 12 b that are used when the arm 10 is locked. Reference numerals 13 and 14 are solenoid type plungers, and 15 lock pins are operated by the plunger 13, and 16 lock pins are operated by the plunger 14. Reference numeral 17 denotes a rubber stopper. The stopper 17 is disposed so as to contact the coil mold 12 before the flexures 1 and 2 come into contact with the pressing portion holding member 8 when the arm is moved in the outer circumferential direction of the magnetic disk 9.
[0010]
The operation of the hard disk drive of the present embodiment configured as described above will be described below with reference to FIGS.
[0011]
2A and 2B show a state before the hard disk device is started. 2A and 2B are a top view and a side view, respectively, of this embodiment. The hard disk drive starts and the magnetic disk 9 starts rotating. When the rotation of the magnetic disk 9 is stabilized, the lock pin 15 is pulled by the plunger 13 and the arm 10 is moved in the arrow A direction. When the arm 10 moves in the direction of arrow A, the flexures 1 and 2 come into contact with the inclined portions 5a and 6a of the pressing members 5 and 6, respectively, and the flexures 1 and 2 are pressed in the direction of the magnetic disk 9, respectively. , 2 come to the parallel portions 5b, 6b, the floating magnetic heads 3, 4 approach the surface of the magnetic disk 9 and lock to the step 12b of the coil mold 12 as shown in FIGS. The pin 16 contacts and the movement of the arm 10 stops. FIGS. 3A and 3B are a top view and a side view of the present embodiment, respectively. Since the floating magnetic heads 3 and 4 approaching the surface of the magnetic disk 9 are provided with a negative pressure type slider, a negative pressure is exerted by the air flow generated by the rotation of the magnetic disk 9, and the magnetic head 9 further approaches the surface of the magnetic disk 9. become. 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 that are pressed and bent in the direction of the magnetic disk 9. It stops at the position where the force to return to the state is restored and enters a loading state in which data can be recorded and reproduced. This state is shown in FIGS. 4 (a) and 4 (b). 4A and 4B are a top view and a side view of the present embodiment, respectively. When loading of the floating magnetic heads 3 and 4 is completed, the lock pin 16 is pulled by the plunger 14 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. The arm 10 is moved to the loading position of the floating magnetic heads 3 and 4, and the arm 10 is temporarily stopped. Then, the lock pin 16 is pushed out by the plunger 14 and the lock pin 15 is pushed out by the plunger 13. Next, when the arm 10 is moved in the outer circumferential direction of the magnetic disk 9 until the coil mold 12 comes into contact with the stopper 17, the floating magnetic heads 3 and 4 are separated from the surface of the magnetic disk 9 and become unloaded. At this time, there is no collision between the floating magnetic head 3 and the floating magnetic head 4 due to the vibration of the flexures 1 and 2 formed of leaf springs during unloading by the contact preventing member 7. When the coil mold 12 comes into contact with the stopper 17, the lock pin 15 enters the step 12a of the coil mold 12 and the arm 10 is locked.
[0012]
As described above, according to the present embodiment, the floating magnetic heads 3 and 4 having the negative pressure type slider are loaded by moving the arm 10 using the pressing member, and the arm 10 is moved in the outer circumferential direction of the magnetic disk 9. The floating type magnetic heads 3 and 4 are separated from the surface of the magnetic disk 9 and unloaded, so that the floating type magnetic heads 3 and 4 shift to the loading state and the unloading state without contacting the surface of the magnetic disk 9. I can do it. Further, as shown in FIGS. 2 (a) and 2 (b), when the hard disk device is not in operation, the contact prevention member 7 provided between the flexure 1 and the flexure 2 floats with the floating magnetic head 3 due to external vibration or impact. The contact of the magnetic head 4 can be prevented.
[0013]
【The invention's effect】
According to the present invention, a floating type magnetic head having a negative pressure type slider is pressed by a movement of an arm using a pressing member, and a floating type magnetic head is brought close to a magnetic disk surface by pressing the flexure. By loading the head and moving the arm toward the outer periphery of the magnetic disk and pulling the floating magnetic head away from the surface of the magnetic disk and unloading it, the load / unload mechanism can be realized with a simple mechanism, Further, when not operating, the negative pressure type slider is not on the surface of the magnetic disk, and a contact prevention member is provided between the two flexures arranged so as to sandwich the magnetic disk. Contact between the negative pressure slider and the magnetic disk due to vibration, shock, etc. It is possible to prevent the contact of, are those that can achieve a low cost of a hard disk drive with high reliability.
[Brief description of the 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. 2 (a) is a top view illustrating the operation of the hard disk device according to an embodiment of the present invention. FIG. 3A is a top view showing the operation of the hard disk device in one embodiment of the present invention. FIG. 3B is a side view showing the operation of the hard disk device in one embodiment of the present invention. 4A is a top view showing the operation of the hard disk device in one embodiment of the present invention. FIG. 5B is a side view showing the operation of the hard disk device in one embodiment of the present invention. 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. Side view showing DESCRIPTION OF SYMBOLS
DESCRIPTION OF SYMBOLS 1 Flexure 2 Flexure 3 Levitation type magnetic head 4 Levitation type magnetic head 5 Press member 6 Press member 7 Contact prevention member 9 Magnetic disk 10 Arm 12 Coil mold 15 Lock pin 16 Lock pin

Claims (2)

A magnetic disk for storing data, a magnetic head for reading data from and writing data to the magnetic disk, a negative pressure type slider for holding the magnetic head, and a swinging of the negative pressure type slider A hard disk device comprising: a flexure for holding; an arm for holding the flexure and moving on the magnetic disk; and a means for locking the arm ;
The pressing member includes an inclined portion inclined toward the magnetic disk surface direction and a parallel portion connected to the inclined portion, and the arm holding the flexure moves, so that the flexure of the pressing member The negative pressure type slider held by the flexure is brought closer to the surface of the magnetic disk by being in contact with the inclined portion and being pressed toward the surface of the magnetic disk and being held at the position of the parallel portion of the pressing member. Hard disk device characterized by A magnetic disk for storing data; a pair of arms that are arranged to face each other with the magnetic disk interposed therebetween; and a pair of flexures attached to each of the pair of arms; A pair of negative pressure sliders attached to the respective magnetic disk side of each of the flexures, and a pair of magnetic heads attached to each of the pair of negative pressure sliders ,
The magnetic disk includes a pair of pressing members each including an inclined portion inclined toward the magnetic disk surface direction and a parallel portion connected to the inclined portion, and the magnetic member is interposed between the pair of flexures. A contact preventing member for separating the pair of flexures outside the disk surface;
In operation, the pair of arms holding the flexure move, so that the respective flexures abut against the inclined portions of the respective pressing members and are pressed toward the surface of the magnetic disk. By being held at the position of the parallel portion, the negative pressure type slider held by each of the flexures is brought close to the surface of the magnetic disk,
The non-operating lifting, by the contact prevention member, a hard disk device, characterized in that to separate the flexure of the one pair out of the magnetic disk surface.

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