JPH06162697A - Magnetic disk apparatus - Google Patents

Abstract

PURPOSE:To provide a low-power magnetic disk drive capable of starting quickly. CONSTITUTION:A magnetic disk apparatus comprises a magnetic head 4 provided corresponding to a magnetic disk 1, a flexure 5 mounted at its end with the head 4 and supported rotatably at a pivot shaft 6 as a center, a coil 7 mounted at an opposite side to the flexure 5, first and second yokes 13, 15 having a magnet 14 to hold the coil 7. A magnetic pin 9 is fixedly supported to a molded part 10 on the outer periphery of the coil 7. The apparatus further comprises an actuator locking mechanism having a locking magnet 21 of a permanent magnet, a locking yoke 22 and a lock clamping screw 23. At the time of non-operating, an actuator having the head 4, the flexure 5, the shaft 6, the coil 7, a coil holder 8 is held by the locking mechanism 12 via the pin 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a structure for fixing an actuator when it is not in operation and a reduction in power consumption when the magnetic disk device is driven.

[0002]

2. Description of the Related Art Conventionally, in order to fix a magnetic head in a landing area in order to protect data on a magnetic disk, a spring is directly attached to the actuator to fix the actuator, and the spring is used to actuate the actuator when not in operation. There are known methods for immobilizing and retracting the.

Further, a wind pan that rotates in conjunction with the actuator is inserted between the magnetic disks, and the force of the air flow and the wind pan associated with the rotation of the magnetic disk are used to make the actuator inactive. Methods for fixing and retracting are known. 16 shows an example of a conventional magnetic disk device. In this example, the actuator including the magnetic head 75, the flexure 76, the arm 77, the coil 78, and the like was fixed by the preload spring 80 of the electromagnetic device 79 when not operating.
The electromagnetic device 79 has a fixed rod 81 for fixing the actuator, a preload spring 80 for giving a preload, and a movable iron core 82 for pulling the fixed rod 81 after power-on, and the magnetic disk device is powered on. The movable iron core 82 is pulled, and the actuator is freed, so that the magnetic head 75 is moved to an arbitrary position to record / reproduce data. Reference numeral 83 is a pivot axis, and 84 is a magnetic disk.

Further, as a known example of a magnetic disk drive device using a resinous magnetic disk substrate, Japanese Patent Laid-Open No. 4-67 is known.
No. 347 is known, and an organic polymer film such as polyethylene terephthalate having a disk thickness of 72 μm or more (equivalent to a floppy disk) is used as a resinous magnetic disk substrate.

[0005]

However, the prior art has the following problems. (1) Due to the influence of an external force such as a spring or a wind force, the current corresponding to the external force had to be adjusted to the current to be applied to the actuator motor during the track movement control (hereinafter referred to as speed control). (2) During settling that switches from speed control to track follow-up control (hereinafter referred to as position control) due to the influence of external force due to springs and wind forces, the settling time increases due to the occurrence of overshoot and undershoot, and data write / write The access time for was long. (3) In order to solve the problem of (2) above, an additional circuit or algorithm for correcting the influence of external force due to the spring or wind force was necessary. (4) When an external force is applied by a spring or wind force, a mechanical resonance point that is harmful to speed / position control occurs due to the natural frequency of the spring and wind receiver. (5) When an electromagnetic device is used, it is necessary to continue supplying current to the electromagnetic device even during normal operation, resulting in high power consumption and large heat generation. (6) In the above-mentioned known example, the magnetic disk substrate is thin, and the magnetic head is of the negative pressure contact type, and the layout of the magnetic disks in the magnetic disk drive device is limited in design. (7) Although an aluminum alloy was used as the substrate of the magnetic disk, the load on the spindle motor was relatively increased due to the reduction in design space due to the miniaturization, and it was difficult to reduce the power consumption of the magnetic disk device.

The object of the present invention is to solve the above-mentioned conventional problems, and by using a permanent magnet for fixing the actuator, all the adverse effects of the external force due to the spring and the wind force of the conventional magnetic disk drive can be removed. By eliminating the problem of natural frequency of springs and wind receivers, eliminating the power consumption for releasing the actuator fixation, and heat generation at all, and by using a resin magnetic disk substrate,
An object of the present invention is to provide a magnetic disk device capable of reducing the drive current of the spindle motor and shortening the startup time of the magnetic disk device.

[0007]

In order to achieve the above object, the present invention provides a first invention in which at least one magnetic disk rotatably supported and at least one magnetic disk corresponding to the magnetic disk. A magnetic head, a flexure that is attached to an end of the magnetic head, and is rotatably supported by a pivot shaft, and a coil provided on a side opposite to the flexure about the pivot shaft via a coil holder, A first yoke having a magnet fixed at a position corresponding to the coil, a second yoke on the opposite side of the first yoke to the coil, and a lock fixed to the second yoke. A yoke, a magnetic pin attached to the outer circumference of the coil by a mold portion, and a lock magnet capable of abutting and holding the magnetic pin when the magnetic disk device is not operating, By applying a voltage to said coil during work, the magnetic head, flexure, a coil holder,
The magnetic disk device is configured so that the actuator including the coil can be released from the lock mechanism.

As a second invention, a magnetic disk device is provided with an outer peripheral stopper for restricting the swing range of the actuator. In the third invention, the lock yoke is fixed to the first yoke. In the fourth aspect of the invention, the mold part for attaching the magnetic pin to the coil is made of a shock absorbing material.

In a fifth aspect of the invention, the magnetic pin also serves as a counterweight of the actuator, and a sixth aspect of the present invention is provided.
In the invention, the magnetic pin is provided with a shock absorbing material, in the seventh invention, the lock yoke is a leaf spring material, and in the eighth invention, the lock yoke or the outer peripheral stopper also serves as a reinforcing material for supporting the first yoke. In the ninth aspect of the invention, the magnetic pin is supported and fixed on the outer periphery of the magnet by the thickness of the magnet or more on the outer periphery.

In a tenth aspect of the invention, the flexure having a substantially circular opening for fixing and supporting, a spacer having at least one substantially circular opening for fixing the flexure, and the flexure are provided. An actuator clamper that fixes the spacers together serves as the flexure supporting and fixing means. 11th
In the invention, the flexure supporting and fixing means is provided, and the flexures are arranged at different positions when viewed from the direction perpendicular to the magnetic disk.

In the twelfth aspect of the invention, the shipping area on the magnetic disk is provided at the inner circumference on the front side and on the outer circumference on the back side. Thirteenth
In the invention, the shipping region is provided on the outer circumference on the front side and on the inner circumference on the back side. In the fourteenth invention, the shipping areas are provided at two inner and outer circumferences on the magnetic disk. In the fifteenth invention, the magnetic disk device having a more specific structure is provided with the actuator lock mechanism, the flexure supporting and fixing means, and the magnetic disk substrate is made of resin.

In the sixteenth invention, the flexures are arranged at different positions from the vertical direction with respect to the magnetic disk. In the seventeenth invention, the bearing portion of the spindle motor is a fluid bearing. In the eighteenth aspect of the invention, the bearing portion that axially supports the magnetic disk of the magnetic disk device is a fluid bearing.

[0013]

In the magnetic disk device of the first invention, by using a permanent magnet for fixing the actuator, all the adverse effects of the external force due to the spring and the wind force of the conventional magnetic disk device are removed, and the natural frequency of the spring and wind receiver is reduced. Since there is no problem and the voltage is applied to the coil only when the actuator is released from the fixed state, it is possible to realize a magnetic disk device that can completely eliminate power consumption and heat generation, and a magnetic disk substrate made of a resin material is used. As a result, it is possible to provide a magnetic disk device that can reduce the drive current of the spindle motor and shorten the startup time of the magnetic disk device.

In the second aspect of the invention, the swing range of the actuator can be restricted by providing the outer peripheral stopper. In the third invention, the lock yoke can be fixed to the first yoke. According to the fourth aspect of the present invention, by configuring the mold portion with the impact absorbing material, the impact when the magnetic pin contacts the outer peripheral stopper or the lock mechanism can be mitigated.

In the fifth aspect of the invention, the magnetic pin acts to keep the actuator balanced. In the sixth and seventh inventions, the cushioning effect is further exerted. In the eighth invention, the first yoke can be firmly supported. In the ninth invention, the magnetic pin is provided at a position apart from the magnet. In the tenth invention, the fixing of the flexure is appropriately adjusted by the spacer.

In the eleventh aspect of the invention, two or more flexures are arranged on both sides of the magnetic disk at different fixing positions.
In the twelfth and thirteenth inventions, the shipping areas are different so as to match the positions of two or more magnetic heads. In the fourteenth invention, two shipping regions are provided on each of the inner and outer circumferences to facilitate access by the magnetic head.

In the fifteenth aspect of the present invention, the actuator lock mechanism and the flexure supporting and fixing device of the magnetic disk device are shown more specifically, and the magnetic disk substrate is made of resin so that the drive current and the startup time can be shortened. 16th
In the invention, two or more flexures are arranged at different positions to facilitate access.

In the seventeenth and eighteenth inventions, a hydrodynamic bearing is provided on the shaft supporting portion of the magnetic disk to make the rotation smoother.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same parts are all numbered the same. 1 is a main plan view showing a first embodiment of a magnetic disk device of the present invention. In FIG. 1, reference numeral 1 is a magnetic disk, which is rotatably supported and fixed to a spindle motor 2 via a clamper 3, and a magnetic head 4 is connected via a gimbal (not shown). The flexure 5 is supported and fixed to the flexure 5.
Are supported and fixed to the pivot shaft 6. At the other end of the magnetic head 4, a coil 7 for driving the magnetic head 4 is supported and fixed to a coil holder 8, and a magnetic pin 9 is supported and fixed to the coil 7 by a mold portion 10. The actuator including the magnetic head 4, the flexure 5, the coil holder 8, and the coil 7 can swing about the pivot shaft 6, and the swing range of the actuator is determined by the outer peripheral stopper 11 and the actuator lock mechanism 12. It is restricted. The magnetic circuit for driving the coil 7 is composed of an upper yoke 13, a magnet 14 adhered and fixed to the upper yoke 13, a lower yoke 15 and two studs 16. The stud 16 and the lower yoke 15 are fixed to a base 17 by fixing screws 16. Has been done. A circulation filter 19 is fixed to the base 17 to keep the environment sealed by the base 17 and the cover 18 always clean. 20 indicates a flexible printed circuit.

When not in operation, the actuator is fixed and held by the actuator lock mechanism 12. After the power is turned on, the spindle motor 2 starts rotating and the magnetic disk 1
Is rotated, the magnetic head 4 is moved to the magnetic disk 1
To surface. The magnetic head 4 reads a servo pattern previously written on the magnetic disk 1, and the output from the magnetic head 4 is passed through a flexible printed circuit (hereinafter referred to as FPC) 20 to a printed circuit board (not shown). Not done; later PC
B)). When a desired output is obtained from the magnetic head 4, a voltage is applied to the coil 7, the actuator released from the actuator lock mechanism 12 can be positioned on a desired track, and the magnetic disk device can be used.

As described above, since it suffices to apply the voltage to the coil 7 only when the actuator is opened, it is not necessary to cause the actuator lock mechanism 12 to consume power during normal use of the magnetic disk device, and the magnetic power consumption is low. A disk device can be realized. FIG. 2 is a plan view illustrating the actuator lock mechanism 12 in detail. In FIG. 2, an actuator including a flexure 5, a coil holder 8, a coil 7 and the like is fixed to an actuator lock mechanism 12 via a magnetic pin 9. The actuator lock mechanism 12 is a permanent magnet including a lock magnet 21, a lock yoke 22, and a lock fixing screw 23. The lock magnet 21 is fixed to the lock yoke 22 by adhesion or the like, and the lock yoke 22 made of magnetic metal is fixed to the lower yoke 15 by a lock fixing screw 23. The mold part 10 that supports and fixes the magnetic pin 9 to the actuator is a low-resilience synthetic resin, and the mold part 10 absorbs the acceleration energy of the actuator when the actuator is retracted or when the actuator is out of control. Protect from crashes etc.

FIG. 3 is a sectional view of the actuator lock mechanism of FIG. A magnetic circuit including an upper yoke 13, a magnet 14, a lower yoke 15 and the like is protected by a base 17 and a cover 18 in a cleaning environment. The actuator is held by an actuator lock mechanism 12 via a magnetic pin 9. The actuator lock mechanism mechanism 12 includes a lock magnet 21, a lock yoke 22, and a lock fixing screw 23. The lock magnet 21 is fixed to the lock yoke 22 by adhesion or the like, and the lock yoke 22 is fixed to the lower yoke 15 by the lock fixing screw 23. It is fixed to. The outer peripheral stopper 11, which is a non-magnetic metal pin, is fixed to the lower yoke 15 by press fitting or the like. By using a non-magnetic metal pin for the outer peripheral stopper 11, it is possible to prevent a decrease in the gap magnetic flux density due to the occurrence of magnetic flux disturbance in the magnetic circuit. In addition, stud 16
Since the upper yoke 13 is supported by the three points (shown in FIG. 2) and the outer peripheral stopper 11, the stability of the magnetic circuit is improved.

Further, in FIG. 3, after the outer peripheral stopper 11 is press-fitted into the lower yoke 15, the outer peripheral stopper 11 is moved to the lower yoke 15.
The lower yoke 15 is attached to the base 17 by fitting a protrusion protruding to the lower part of the base 17 and a counterbore on the side of the base 17 and fitting the protrusion of the outer peripheral stopper 11 to the countersink of the base 17.
It is possible to improve the assemblability at the time of attaching to.

FIG. 4 is a main plan view showing a second embodiment of the magnetic disk device of the present invention. In FIG. 4, the actuator including the flexure 5, the coil holder 8, the coil 7, etc. is held by the actuator lock mechanism 25 via the magnetic pin 24. Actuator lock mechanism 25
Is a lock magnet 26 and a lock yoke 27.
26 is fixed to a lock yoke 27 by adhesion or the like, and the lock yoke 27 is fixed to an upper yoke 28. Mold part 29 that supports and fixes the magnetic pin 24 to the actuator
Is a low-resilience synthetic resin, and the mold portion 29 absorbs the acceleration energy of the actuator when the actuator is retracted or when the actuator is out of control, and protects the magnetic head (shown in FIG. 1) from a head crash or the like.

FIG. 5 is a main sectional view showing a second embodiment of the magnetic disk device of the present invention and is a sectional view of FIG.
A magnetic circuit including an upper yoke 28, a magnet 30, a lower yoke 31 and the like is protected by a base 17 and a cover 18 in a cleaning environment. The actuator is held by an actuator lock mechanism 25 via a magnetic pin 24. The actuator lock mechanism 25 includes a lock magnet 26, a lock yoke 27, and a lock fixing screw 32.The lock magnet 26 is fixed to the lock yoke 27 by adhesion or the like, and the lock yoke 27 is fixed to the upper yoke 28 by the lock fixing screw 32. It is fixed. In this embodiment, a half punch 33 is provided in order to improve the assemblability of the upper yoke 28 and the lock yoke 27.

The outer peripheral stopper 34, which is a non-magnetic metal pin, is fixed to the upper yoke 28 by press fitting or the like. By using a non-magnetic metal pin for the outer peripheral stopper 34,
It is possible to prevent a decrease in the gap magnetic flux density due to the occurrence of magnetic flux disturbance in the magnetic circuit. In addition, the stud 16 (Fig. 4
2), the outer peripheral stopper 34, and the actuator lock mechanism (the lock magnet 26 and the lock yoke 27) support the upper yoke 28 at four points, thereby further improving the stability of the magnetic circuit.

Further, the magnetic pin 24 is hollow for balancing the actuator and adjusting the holding force of the actuator. In FIGS. 4 and 5, in order to prevent the magnetic flux of the magnetic circuit from adversely affecting the magnetic pin 24, the magnetic pin 24 is supported and fixed on the outer peripheral side of the magnet 30. According to the experimental results of this embodiment, if the outer peripheral side h (corresponding to the thickness h of the magnet 30 in FIG. 5) of the magnet 30 in FIG. It has been confirmed that there was no adverse effect on 24.

Further, in FIGS. 4 and 5, one-third or more of the total length of the magnetic pin 24 is embedded in the mold portion 29 in order to strengthen the supporting and fixing force of the magnetic pin 24. FIG. 6 is a main sectional view showing a third embodiment of the magnetic disk device of the present invention. A magnetic circuit including an upper yoke 35, a magnet 36, a lower yoke 37, etc. is protected by a base 17 and a cover 18 in a cleaning environment. The actuator is fixed to an actuator lock mechanism 39 via a magnetic pin 38. The actuator lock mechanism 39 includes a lock magnet 40 and a lock yoke 41.
The lock magnet 40 is composed of
Further, the actuator lock mechanism (lock magnet 40 and lock yoke 41) is fitted and fixed between the upper yoke 35 and the lower yoke 37 by the magnetic force of the magnet 36.

In this embodiment, the upper yoke 35 and the lock yoke 41
Two half punches 42 are provided in order to improve the assemblability. Further, the outer peripheral stopper 43 is fixed to the upper yoke 35 by press fitting or the like, and the outer peripheral stopper 43 uses a non-magnetic metal pin. By using a non-magnetic metal pin for the outer circumference stopper 43, it is possible to prevent a decrease in the gap magnetic flux density due to the occurrence of magnetic flux disturbance in the magnetic circuit. Furthermore, two studs 16 (shown in FIG. 4), an outer peripheral stopper 43, and an actuator lock mechanism (lock magnet 40
And the yoke 41) to support the upper yoke 35,
The stability of the magnetic circuit is improved.

Further, at the time of retracting the actuator,
Alternatively, the magnetic pin 38 is provided with a damper 44 in order to further absorb the acceleration energy of the actuator when the actuator is out of control. That is, during the retract, the acceleration energy of the actuator is absorbed only by the damper 44, and during the runaway, the acceleration energy of the actuator is absorbed by using the two-stage damping effect of the damper 44 and the mold portion 45.

FIG. 7 is a main sectional view showing a fourth embodiment of the magnetic disk device of the present invention. Upper yoke 46, magnet 47,
The magnetic circuit including the lower yoke 48 and the like is protected in the washing environment by the base 17 and the cover 18. The actuator is held by the actuator lock mechanism 50 via the magnetic pin 49. Actuator lock mechanism 50 has lock magnet 5
1, a lock yoke 52, and a lock fixing screw 53, the lock magnet 51 is fixed to the lock yoke 52 by adhesion or the like, and the lock yoke 52 is fixed to the upper yoke 46 by the lock fixing screw 53. In this embodiment, the upper yoke 46
A half punch 54 is provided in order to improve the assemblability of the lock yoke 52. The outer peripheral stopper 55 is fixed to the upper yoke 46 by press fitting or the like, and the outer peripheral stopper 55 uses a nonmagnetic metal pin. By using a non-magnetic metal pin for the outer peripheral stopper 55, it is possible to prevent a decrease in the gap magnetic flux density due to the occurrence of magnetic flux disturbance in the magnetic circuit. In addition, the stud 16 (shown in FIG. 4) 2
Since the upper yoke 46 is supported by the three points of the individual piece and the outer peripheral stopper 55, the stability of the magnetic circuit is further improved.

When the actuator is retracted or the actuator is out of control, a damper 56 is attached to the magnetic pin 49 in order to absorb the acceleration energy of the actuator.
Is provided. Further, since the actuator lock mechanism frequently retracts, the lock yoke 52 is a leaf spring, and during normal retract operation, the acceleration energy of the actuator is absorbed only by the damper 56 fixed to the magnetic pin 49. In addition, the lock yoke 52 that also functions as a leaf spring and the damper 56 during the runaway of the actuator that has to attenuate more energy than during the retract,
The reliability of the magnetic disk device is further improved by the three-stage damping effect of the molded part 57.

In the first to fourth embodiments, the non-magnetic metal pins are press-fitted and fixed to the lower yoke (or the upper yoke) as the outer peripheral stoppers 11, 34, 43, 55, but synthetic resin or the like is used as the outer peripheral stoppers. It is obvious that the effect of the present invention can be obtained by injection-molding the lower yoke (or the upper yoke). Further, in these embodiments, as a method of damping the acceleration energy of the actuator, a combination of a mold portion and a lock yoke also serving as a leaf spring, or a combination of a damper and a lock yoke also serving as a leaf spring may be used. .

FIG. 8 is a main sectional view showing a fifth embodiment of the magnetic disk device of the present invention. Two magnetic disks 1
Is rotatably supported and fixed to the spindle motor 2 via a spindle motor spacer 58 and a clamper 3. The four magnetic heads 4 are supported and fixed to four flexures 5 via gimbals (not shown), and the four flexures 5 further include an actuator spacer 59, an actuator spacer 60, and a coil holder 8. Is supported and fixed to the pivot shaft 6 via. A coil 7 for driving the magnetic head 4 is supported and fixed to a coil holder 8 at the other end of the magnetic head 4. An actuator including a magnetic head 4, a flexure 5, an actuator spacer 59, an actuator spacer 60, a coil holder 8 and a coil 7 can swing about a pivot shaft 6 as a center of a rotation shaft, and the pivot shaft 6 can be fixed with a pivot fixing screw. It is fixed to the base 17 by 61. The magnetic circuit that drives the coil 7 is the upper yoke.
It is composed of a magnet 14 adhered and fixed to the upper yoke 13 and the lower yoke 15 and the like, and fixed to a base 17. The environment sealed by the base 17 and the cover 18 is always kept clean.

After the power is turned on, the spindle motor 2 starts to rotate and the magnetic disk 1 rotates, so that the magnetic head 4 is levitated on the magnetic disk 1. The magnetic head 4 reads a servo pattern previously written on the magnetic disk 1, and the output from the magnetic head 4 is passed through an FPC (not shown; see FIG. 1) to a PCB (printed circuit board). Send to.

FIG. 9 is an enlarged view of the main part of the actuator section. An opening 63 for clamping is provided on the pivot shaft 61, and an actuator clamper 64 is fitted into the opening 63 to connect the four flexures 5, the actuator spacer 59, the actuator spacer 60, and the coil holder 8. It is supported and fixed to the pivot shaft 6. In addition, the pivot shaft 6 is attached to the base with the pivot fixing screw 61.
It is fixed at 17.

As described above, the flexure 5 and the spacer (actuator spacer) are used without using the conventional arm.
By alternately stacking 59, 60 and coil holder 8), not only can the actuator be made thinner, but also
The magnetic disk device itself can be made thinner. Further, it is not necessary to redesign the arm due to the difference in the thickness of the magnetic head 4, and only the thicknesses of the actuator spacers 59 and 60, the coil holder 8 and the like need to be changed, which not only shortens the development delivery time of the new model, but also Parts of the flexure 5 and the like can be shared, and the cost of the magnetic disk device can be reduced.

FIG. 10 shows a sixth embodiment of the magnetic disk device of the present invention.
FIG. 9 is a main cross-sectional view showing the embodiment of FIG. 9 and is different from FIG. 9 in that a sea ring is used as the actuator clamper 65. Even if a sea ring is used as the actuator clamper 65, the effect of the present invention that the magnetic disk device can be thinned is not lost. In addition, the flexure 5 and the spacer (actuator spacer 59, 6
0, coil holder, etc.) may be fixed with an adhesive or the like.

FIG. 11 is an exploded plan view of the actuator section. The actuator is an HGA U including a pivot shaft 6, a magnetic head 4, a flexure 5 and a mount 66.
P (head gimbal assembly up) 67, coil holder 8 in which the coil 7 and the magnetic pin 9 are adhesively fixed, and the mounting direction to the magnetic disk is HGA UP67.
Opposite to HGA DOWN (head gimbal assembly down) 68, actuator spacer 60, H
GA UP67, actuator spacer 59, HGA
It is composed of a DOWN 68 and an actuator clamper 64.

FIG. 12 is an exploded detailed view for explaining the HGA DOWN 68. The flexure 5 has a thickness of about 8
The gimbal portion 69, which is a 0 μm stainless steel spring material and supports and fixes the magnetic head 4, is formed by partially etching the flexure 5 to have a thickness of about 40 μm in order to improve the resonance point of the HGA. Claws 72 for crimping are provided on the flexure 5 to fix the tube 71 that protects the lead wire 70 of the magnetic head 4. As a reinforcing material when the flexure 5 is fixed to the actuator,
A mount 66 of about 0.2 mm is attached to the flexure 5 by laser welding or the like.

As described above, by using the HGA of this embodiment, the height of the caulking portion for fixing the conventional HGA to the arm is unnecessary, so that not only the HGA can be made thin, but also The actuator can be made thinner and the magnetic disk device can be made thinner. Although the mount 66 is used as the reinforcing material of the flexure 5 in the present embodiment, by omitting the mount 66, the magnetic disk device can be thinned and the magnetic disk device can be further reduced in cost.

Further, in FIG. 12, the gimbal portion 69 is a partial etching of the same material as the flexure 5 in order to improve the resonance point of the HGA, but a conventional spring material is fixed to the flexure 5 by spot welding or the like. Even with a gimbal, the effect of the present invention is not lost. FIG. 13 is a principal plan view showing a seventh embodiment of the magnetic disk device of the present invention.

Reference numerals 1 to 20 indicate the same parts as in FIG. In the above-mentioned known example, polyethylene terephthalate was used as the base material of the magnetic disk 1, and a disk having a disk thickness of 72 μm or more was used. However, in this embodiment, the substrate of the magnetic disk 1 is polycarbonate, which is a thermoplastic resin, and has a thickness of It is about 0.7 mm and has a diameter of about 48 mm (1.8 inches). The HGA DOWN 68 including the magnetic head 4 and the flexure 5 is arranged on the front surface of the magnetic disk 1, and the HGA UP67 is arranged on the rear surface of the magnetic disk 1 to allow the warp of the magnetic disk 1.
The OWN 68 and the HGA UP67 are arranged at an angle of θ. In this embodiment, the angle θ is set to 65 degrees in order to improve the reliability and the assemblability of the magnetic disk device.

The specific gravity of aluminum is about 2.7 g / cm.
³ , the specific gravity of polycarbonate is about 1.3 g / cm ³ . Assuming that the magnetic disk 1 has the same substrate shape, by changing the substrate material of the magnetic disk 1 from aluminum to polycarbonate, the load applied to the spindle motor 2 is reduced by about half at both the start-up and the steady rotation. Here, the load applied to the spindle motor 2 is 9
0% is the inertia of the magnetic disk 1 (moment of inertia)
Is. That is, in the magnetic disk device of the present invention, the startup time of the spindle motor 2, which is the time from when the power is turned on to when the magnetic disk 1 reaches steady rotation, can be halved.

Furthermore, since the steady load of the spindle motor 2 is halved when the magnetic disk 1 is steadily rotating, the drive current of the spindle motor 2 can be halved in the magnetic disk device of the present invention, resulting in low consumption. It becomes possible to realize a magnetic disk device of electric power. In the embodiment, in order to allow the warp of the magnetic disk 1, the HGA DOWN68
The HGA UP67 and the HGA UP67 are arranged with an angle of θ, but depending on the thickness of the magnetic disk 1, the angle of θ may be 0 ° as shown in FIG. Specifically, when the diameter of the magnetic disk 1 substrate is 48 mm and the substrate thickness is 0.7 mm or more, the angle θ is set to 0 as shown in FIG.
It was confirmed by experiments that the warp of the magnetic disk 1 was within the allowable range.

FIG. 14 shows the eighth embodiment of the magnetic disk device of the present invention.
FIG. 6 is a main plan view showing the embodiment of FIG. Reference numerals 1 to 20 are shown in FIG.
Shows the same part as. Here, in this embodiment, the substrate of the magnetic disk 1 is polycarbonate, which is a thermoplastic resin, and has a thickness of about 0.7 mm and a diameter of about 48 mm (1.8 mm).
Inches). The HGA DOWN 68 including the magnetic head 4 and the flexure 5 is arranged on the front surface of the magnetic disk 1, and the HGA UP67 is arranged on the rear surface of the magnetic disk 1 to allow the warp of the magnetic disk 1.
The OWN 68 and HGA UP67 are arranged at an angle of 65 degrees or more.

Further, HGA is formed on the surface of the magnetic disk 1.
The inner shipping area 73 for the DOWN 68 and the outer shipping area 74 for the HGA UP67 are provided on the back surface of the magnetic disk 1.
Is prepared. In these shipping areas, the magnetic head uses CSS (contact start stop)
To improve the reliability of the data. In this embodiment, one shipping area (73 and 74 in FIG. 14) is provided on each of the front and back sides of the magnetic disk 1, but two shipping areas may be provided on the front and back sides of the magnetic disk 1. Good.

Further, in this embodiment, the substrate of the magnetic disk 1 is made of polycarbonate which is a thermoplastic resin.
It has been confirmed by an experiment that the same effect can be obtained even when polyimide, which is a thermosetting resin, is used as the substrate of the magnetic disk 1. Further, it has been confirmed by experiments that the same effect can be obtained when polyethylene or the like is used as the substrate of the magnetic disk 1.

Further, in the above-mentioned known example, polyethylene terephthalate was used as the base material of the magnetic disk, and the disk thickness of 72 μm or more was used. However, since the magnetic disk is too thin, the distance between the magnetic disk and the cover is , There was a constraint that the distance between the magnetic disk and the base should be almost equal. However, since the thickness of the magnetic disk 1 is 0.7 mm in this embodiment, there is no restriction on the distance between the magnetic disk 1 and the cover 18 and the distance between the magnetic disk 1 and the base 17. Therefore, the arrangement of the magnetic disks in the magnetic disk device is not limited, and the magnetic disk device of the present invention has a high degree of freedom in design.

FIG. 15 shows a ninth embodiment of the magnetic disk device of the present invention.
FIG. 3 is a main cross-sectional view showing the embodiment of FIG. One magnetic disk 1 is rotatably supported and fixed to a spindle motor 2 via a spindle motor spacer 58 and a clamper 3. The two magnetic heads 4 are respectively supported and fixed to two flexures 5 via gimbals (not shown), and the two flexures 5 are further attached via a coil holder 8 to a pivot shaft by an actuator clamper. 6
It is supported and fixed to. A coil 7 for driving the magnetic head 4 is supported and fixed to a coil holder 8 at the other end of the magnetic head 4. Magnetic head 4, flexure 5,
An actuator including an actuator clamper 64, a coil holder 8 and a coil 7 can swing about a pivot shaft 6 as a center of a rotation shaft, and the pivot shaft 6 is fixed to a base 17 by a pivot fixing screw 61.
The magnetic circuit that drives the coil 7 is an upper yoke 13 and an upper yoke.
It consists of a magnet 14 and a lower yoke 15 which are adhesively fixed to 13, and is fixed to a base 17. The environment sealed by the base 17 and the cover 18 is always kept clean.

After the power is turned on, the spindle motor 2 starts to rotate and the magnetic disk 1 rotates, so that the magnetic head 4 is levitated on the magnetic disk 1. The magnetic head 4 reads the servo pattern previously written on the magnetic disk 1, and sends the output from the magnetic head 4 to the PCB 62 through an FPC (not shown; see FIG. 1).
In this embodiment, as the bearing of the spindle motor 2,
By using a fluid bearing different from the conventional roller bearing and occupying a large magnetic circuit space inside the spindle motor 2, low power consumption of the magnetic disk device is realized.

Further, since the shaft of the spindle motor 2 can be designed up to a diameter of about 5 mm by using the fluid bearing, the reliability of the magnetic disk drive against impact is improved.

[0053]

As described above, according to the present invention, by providing a magnetic disk device using a permanent magnet for fixing an actuator and a magnetic disk substrate made of a resin material, (1) a spring and a wind force are provided. Since there is no influence of the external force due to, it is not necessary to add or subtract the current corresponding to the external force to the current to be applied to the actuator motor during the speed control of the track movement. (2) It is possible to prevent the settling time from increasing due to the occurrence of overshoot or undershoot during the settling in which the speed control is switched to the position control due to the influence of the external force of the spring or the wind force. (3) A circuit configuration or algorithm for correcting the influence of external force due to spring or wind force is not required. (4) When an external force is applied by a spring or wind force, the mechanical resonance point that is harmful to speed / position control does not occur due to the natural frequency of the spring and wind receiver. (5) Since no electromagnetic device is used, power consumption and heat generation can be minimized. (6) In Japanese Unexamined Patent Publication No. 4-67347, the magnetic disk substrate is thin and the magnetic head is of a negative pressure contact type, and the magnetic disk arrangement in the magnetic disk drive device is limited in design. No restrictions needed. (7) The load on the spindle motor is halved, the startup time is shortened, and low power consumption is possible.

As described above, the effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part showing a first embodiment of a magnetic disk device of the present invention.

FIG. 2 is an enlarged plan view of a main part of the first embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of the first embodiment.

FIG. 4 is an enlarged plan view of an essential part showing a second embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part of the second embodiment.

FIG. 6 is an enlarged sectional view of an essential part showing a third embodiment.

FIG. 7 is an enlarged cross-sectional view of an essential part showing a fourth embodiment.

FIG. 8 is a cross-sectional view of an essential part showing a fifth embodiment.

FIG. 9 is an enlarged cross-sectional view of the essential parts of the fifth embodiment.

FIG. 10 is an exploded plan view of the fifth embodiment.

FIG. 11 is an enlarged plan view showing a part of the fifth embodiment in a separated manner.

FIG. 12 is an enlarged sectional view of an essential part showing a sixth embodiment.

FIG. 13 is a plan view of an essential part showing a seventh embodiment.

FIG. 14 is a plan view of an essential part showing an eighth embodiment.

FIG. 15 is a cross-sectional view of essential parts showing a ninth embodiment.

FIG. 16 is a plan view of an essential part showing the internal configuration of a conventional magnetic disk device.

[Explanation of symbols]

 1 magnetic disk 2 spindle motor 4 magnetic head 5 flexure 6 pivot shaft 7 coil 8 coil holder 9, 24, 38, 49 magnetic pin 10, 29, 45, 57 mold part 11, 34, 43, 55 outer peripheral stopper 12, 25, 39,50 Actuator lock mechanism 13,28,35,46 First yoke 14,30,36,47 Magnet 15,31,37,48 Second yoke 16 Stud 17 Base 18 Cover 21, 26, 40, 51 Lock Magnet 22, 27, 41, 52 Lock yoke 23, 32, 53 Lock fixing screw 33, 42, 54 Half punch 59, 60 Actuator spacer 64, 65 Actuator clamper 69 Gimbal section 73 Inner circumference shipping area 74 Outer circumference shipping area

Claims (18)

[Claims] 1. A rotatably supported magnetic disk, at least one magnetic disk, at least one magnetic head corresponding to the magnetic disk, and the magnetic head attached to an end thereof so that the pivot shaft is rotatable. A supported flexure, a coil provided via a coil holder on the opposite side of the flexure about the pivot shaft, and a first yoke fixed to a magnet provided at a position corresponding to the coil, A second yoke corresponding to the coil on the side opposite to the first yoke, a lock yoke fixed to the second yoke, a magnetic pin attached to the outer circumference of the coil by a mold portion, and the magnetic pin. A lock magnet capable of abutting and holding the magnetic disk device when the magnetic disk device is not operating, and applying a voltage to the coil when the magnetic disk device is operating, The magnetic disk device is characterized in that an actuator including a charger, a coil holder, and a coil can be released from a lock mechanism. 2. The magnetic disk drive according to claim 1, further comprising an outer peripheral stopper for restricting a swing range of the actuator. 3. The magnetic disk drive according to claim 1, wherein the lock yoke is fixed to the first yoke. 4. The magnetic disk device according to claim 1, wherein the mold portion is a shock absorbing material. 5. The magnetic pin also serves as a counter weight of the actuator, as claimed in claim 1, 2, 3,
Alternatively, the magnetic disk device according to item 4. 6. The magnetic disk drive according to claim 1, wherein the magnetic pin is provided with a shock absorbing material. 7. The magnetic disk drive according to claim 1, wherein the lock yoke is a leaf spring material. 8. The lock yoke or the outer peripheral stopper is the first.
8. The magnetic disk device according to claim 1, which also functions as a reinforcing material for supporting the yoke of claim 1. 9. The magnetic pin is supported and fixed on the outer circumference of the magnet at least by the thickness of the magnet from the outermost circumference side of the magnet. The magnetic disk device described. 10. At least one magnetic disk rotatably supported, at least one magnetic head corresponding to the magnetic disk, and the magnetic head attached to an end of the pivot shaft so as to be rotatable about a pivot shaft. A supported flexure, a coil provided via a coil holder on the opposite side of the flexure about the pivot shaft, and a first yoke fixed to a magnet provided at a position corresponding to the coil, A second yoke corresponding to the coil on the side opposite to the first yoke, a lock yoke fixed to the second yoke, a magnetic pin attached to the outer circumference of the coil by a mold portion, and the magnetic pin. A lock magnet that can be held in contact with the magnetic disk device when the magnetic disk device is not in operation, and a voltage is applied to the coil when the magnetic disk device is in operation so that In a magnetic disk device capable of releasing an actuator composed of a shear, a coil holder, and a coil from a lock mechanism, the flexure having a substantially circular opening for fixing and supporting, and at least one flexure for fixing the flexure. A spacer having a substantially circular opening, and an actuator clamper for fixing the flexure and the spacer together,
A magnetic disk device comprising the flexure supporting and fixing means. 11. A flexure having a substantially circular opening for fixed support, and a spacer having at least one substantially circular opening for fixing the flexure,
11. The flexure and an actuator clamper for fixing the spacer together serve as flexure supporting and fixing means, and the flexure sandwiching a magnetic disk is arranged at different positions when viewed from a direction perpendicular to the magnetic disk. Magnetic disk device. 12. The magnetic disk device according to claim 10, wherein a shipping area on the magnetic disk is provided on the inner surface of the front surface of the magnetic disk and on the outer surface of the back surface of the magnetic disk. 13. A magnetic disk drive according to claim 10, wherein a shipping area on the magnetic disk is provided on an inner circumference of a front surface of the magnetic disk and on an inner circumference of a back surface of the disk. 14. The magnetic disk drive according to claim 10, wherein two shipping areas on the magnetic disk are provided inside and outside the magnetic disk. 15. A rotatably supported magnetic disk, at least one magnetic disk, at least one magnetic head corresponding to the magnetic disk, a spindle motor for rotating the magnetic disk, and a fixed support for the magnetic head. A gimbal, a flexure for supporting and fixing the gimbal, a flexure supporting and fixing means for supporting and fixing the flexure, a coil for driving the magnetic head, and a coil holder for supporting and fixing the coil.
, A second yoke, at least one magnet adhered and fixed to the first yoke, and at least one gap forming a gap between the first yoke and the second yoke. A stud, at least one fixing screw for fixing the stud to a base, a cover for engaging with the base, the magnetic head, the gimbal, the flexure, the flexure supporting and fixing means, the coil, and the coil holder. An actuator lock mechanism capable of holding an actuator consisting of a timely member, and a mold part for supporting and fixing a magnetic pin to the coil;
An actuator lock mechanism including a lock yoke fixed to the yoke and a lock magnet capable of abutting and holding the magnetic pin is provided, and an outer peripheral stopper for restricting a swing range of the actuator is provided. The magnetic pin is fixed to the first yoke, the magnetic pin also serves as a counterweight of the actuator, the magnetic pin is provided with a shock absorbing material, the outer peripheral stopper is a non-magnetic metal, and the outer peripheral stopper is the first The flexure, which also functions as a reinforcing member for supporting the yoke, has the magnetic pin supported and fixed on the outer circumference of the magnet from the outermost circumference side by a thickness equal to or more than the thickness of the magnet, and the flexure having a substantially circular opening for fixed support. Having at least one substantially circular opening for fixing the spacer, the flexure and the spacer The an actuator clamper together allowed to fixed to the flexure support fixing means,
A magnetic disk device, wherein the substrate of the magnetic disk is a thermoplastic resin. 16. The magnetic disk device according to claim 15, wherein flexures sandwiching the magnetic disk are arranged at different positions when viewed from the direction perpendicular to the magnetic disk. 17. The magnetic disk device according to claim 15, wherein the bearing portion of the spindle motor is a fluid bearing. 18. At least one magnetic disk, at least one magnetic head corresponding to the magnetic disk, a spindle motor for rotating the magnetic disk, a gimbal for supporting and fixing the magnetic head, and the gimbal. A flexure for supporting and fixing, a flexure supporting and fixing means for supporting and fixing the flexure, a coil for driving the magnetic head, a coil holder for supporting and fixing the coil, a first yoke, a second yoke, and At least one adhesively fixed to the first yoke
Magnets, at least one stud that forms a gap between the first yoke and the second yoke, at least one fixing screw that fixes the stud to the base, and the base, A magnetic disk device having a matching cover, an actuator lock mechanism capable of holding an actuator consisting of the magnetic head, the gimbal, the flexure, the flexure supporting and fixing means, the coil, and the coil holder in a timely manner, A magnetic disk device, wherein a bearing portion of the spindle motor is a fluid bearing.