JP3184340B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to a non-operating actuator fixing structure and a reduction in power consumption when the magnetic disk drive is driven.

[0002]

2. Description of the Related Art Conventionally, in order to secure a magnetic head to a landing area to protect data on a magnetic disk, a spring is directly attached to the actuator to fix the actuator, and the spring is used when the actuator is not operated. Methods for fixing and retracting are known.

In addition, a wind receiver that rotates in conjunction with the actuator is inserted between the magnetic disks, and the force of the air flow accompanying the rotation of the magnetic disk and the wind receiver are used to make the actuator inactive during operation. Methods for fixing and retracting are known. FIG. 16 shows an example of a conventional magnetic disk drive. In this example, when not operating, 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.
The electromagnetic device 79 has a fixed rod 81 for fixing the actuator, a preload spring 80 for applying a preload, and a movable iron core 82 for pulling the fixed rod 81 after turning on the power, and the power of the magnetic disk drive is turned on. And the movable iron core 82 is pulled, and the actuator becomes free, so that the magnetic head 75 is moved to an arbitrary place to record and reproduce data. 83 indicates a pivot axis, and 84 indicates a magnetic disk.

A known example of a magnetic disk drive using a resinous magnetic disk substrate is disclosed in JP-A-4-67.
No. 347 is known, and a disk made of an organic polymer film such as polyethylene terephthalate and having a disk thickness of 72 μm or more (a floppy disk equivalent) is used as a resinous magnetic disk substrate.

[0005]

However, the prior art has the following problems. (1) Due to the effect of an external force due to a spring (spring) or wind force, a current corresponding to the external force has to be added to or subtracted from the current to be applied to the actuator motor during track movement control (hereinafter referred to as speed control). (2) During settling when switching from speed control to track following control (hereinafter referred to as position control) under the influence of an external force due to a spring or wind force, the settling time increases due to the occurrence of overshoot or undershoot, and the data write / read Because the access time was long. (3) In order to solve the above problem (2), an additional circuit or an algorithm for correcting the effect of an external force due to a spring or wind force was required. (4) When an external force is applied by a spring or wind force, a mechanical resonance point harmful to speed / position control occurs due to the natural frequency of the spring or wind receiver. (5) When an electromagnetic device is used, current must be continuously supplied to the electromagnetic device even during normal operation, which consumes a large amount of power and generates a large amount of heat. (6) In the known example, the magnetic disk substrate is thin and the magnetic head is of a negative pressure contact type, and the arrangement of the magnetic disk in the magnetic disk drive 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 miniaturization, and it was difficult to reduce the power consumption of the magnetic disk device.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem. By using a permanent magnet for fixing the actuator, it is possible to eliminate all the adverse effects of the external force due to the spring and wind force of the conventional magnetic disk drive. By eliminating the problem of the natural frequency of springs and wind receivers, further eliminating the power consumption for fixing the actuator and releasing heat, and using a resin magnetic disk substrate,
An object of the present invention is to provide a magnetic disk drive capable of reducing the drive current of a spindle motor and shortening the startup time of the magnetic disk drive.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides, in a first aspect, at least one rotatably supported magnetic disk and at least one magnetic disk corresponding to the magnetic disk. A magnetic head, a flexure attached to the end of the magnetic head, and rotatably supported on a pivot shaft; and a coil provided via a coil holder on a side opposite to the flexure about the pivot shaft. A first yoke fixed to a magnet provided at a position corresponding to the coil, a second yoke corresponding to the coil on a side opposite to the first yoke, and a lock fixed to the second yoke; a yoke, comprising: a magnetic pin mounted by the mold part to the outer periphery of the coil, and a lock magnets can abut holding the magnetic pin at the time of non-operation of the magnetic disk device A gas-disk device, said lock
The yoke also serves as a reinforcing member for supporting the first yoke, and applies a voltage to the coil during operation, and
A special feature is that the actuator consisting of the flexure, coil holder, and coil can be released from the lock mechanism.
The magnetic disk device is a feature of the present invention.

According to a second aspect of the present invention, an outer peripheral stopper for regulating the swing range of the actuator is provided , and the first yoke is supported.
The magnetic disk device also served as a reinforcing material. In the third invention, the lock yoke is fixed to the first yoke. In the fourth invention, the mold for attaching the magnetic pin to the coil is made of a shock absorbing material.

According to a fifth aspect of the present invention, the magnetic pin also serves as a counterweight of the actuator.
In the invention, the magnetic pin is provided with a shock absorbing material. In the seventh invention, the lock yoke is made of a leaf spring material .
The bearing of the pindle motor was a fluid bearing.

In the ninth invention, a more specific configuration of the magnetic
An actuator lock mechanism is provided on the disk
Kisher support fixing means is provided, and the magnetic disk substrate is
It was made to consist of. The tenth invention is a flexure
The arrangement is different from the perpendicular direction to the magnetic disk.
Was placed. The eleventh invention is a magnetic disk drive.
The bearing portion that supports the shaft is a fluid bearing.

[0011]

[0012]

[0013]

The magnetic disk drive according to the first aspect of the present invention uses a permanent magnet to fix the actuator, thereby eliminating all the adverse effects of the external force due to the spring and wind force of the conventional magnetic disk drive and reducing the natural frequency of the spring and wind receiver. Since there is no problem, and a voltage need only be applied to the coil only when the actuator is unlocked, it is possible to realize a magnetic disk device that can completely eliminate power consumption and heat generation, and use a resin-made magnetic disk substrate. Thus, it is possible to provide a magnetic disk drive capable of reducing the drive current of the spindle motor and shortening the startup time of the magnetic disk drive.

In the second invention, the swing range of the actuator is restricted by providing the outer peripheral stopper, and the first stopper is provided .
It can also serve as a reinforcement for supporting the yoke. In the third invention, the lock yoke can be fixed to the first yoke. According to the fourth aspect of the invention, the impact when the magnetic pin comes into contact with the outer peripheral stopper or the lock mechanism can be reduced by forming the mold portion with the shock absorbing material.

In the fifth aspect, the magnetic pin functions to maintain the balance of the actuator. In the sixth and seventh inventions, the buffering action is more exerted. In the eighth invention, the axis of the magnetic disk
A fluid bearing is provided on the support to make the rotation smoother.
Was.

[0016]

In the ninth invention, the actuator lock mechanism and the flexure supporting and fixing device of the magnetic disk drive are more specifically shown, and the drive current can be reduced and the start-up time can be reduced by using the magnetic disk substrate as a resin. In the tenth invention, two or more flexures are provided at different positions to facilitate access. In the eleventh invention, the magnetic
A fluid bearing is provided on the disk shaft support to make rotation smoother.
It was to so.

[0018]

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same parts are all given the same numbers. FIG. 1 is a main plan view showing Embodiment 1 of the magnetic disk drive of the present invention. In FIG. 1, reference numeral 1 denotes a magnetic disk. The magnetic disk 1 is rotatably supported and fixed to a spindle motor 2 via a clamper 3, and a magnetic head 4 is provided via a gimbal (not shown). It is supported and fixed to the flexure 5 and further flexure 5
Are supported and fixed to the pivot shaft 6. 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, and a magnetic pin 9 is supported and fixed to the coil 7 by a molding unit 10. The actuator including the magnetic head 4, the flexure 5, the coil holder 8, the coil 7, and the like can swing about the pivot shaft 6 as a center of rotation. The swing range of the actuator is determined by an outer peripheral stopper 11 and an actuator lock mechanism 12. Limited. The magnetic circuit for driving the coil 7 is composed of an upper yoke 13, a magnet 14 bonded 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. Have been. A circulation filter 19 is fixed to the base 17 so as to always keep the environment sealed by the base 17 and the cover 18 clean. 20 indicates a flexible printed circuit.

When not operating, the actuator is fixedly held by the actuator lock mechanism 12. After turning on the power, the spindle motor 2 starts rotating and the magnetic disk 1
Is rotated to move the magnetic head 4 to the magnetic disk 1.
Surface. The magnetic head 4 reads out a servo pattern written on the magnetic disk 1 in advance, and outputs the output from the magnetic head 4 through a flexible printed circuit (hereinafter referred to as FPC) 20 to a printed circuit board (not shown). No; since then 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, it is only necessary to apply a voltage to the coil 7 only when the actuator is opened. Therefore, during normal use of the magnetic disk drive, there is no need to cause the actuator lock mechanism 12 to consume any power. A disk device becomes feasible. 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 bonding or the like, and the lock yoke 22, which is a magnetic metal, is fixed to the lower yoke 15 by a lock fixing screw 23. The mold section 10 for supporting and fixing the magnetic pins 9 to the actuator is made of a low resilience synthetic resin. When the actuator is retracted or the actuator runs away, the mold section 10 absorbs the acceleration energy of the actuator, and the magnetic head 4 Protect from crashes.

FIG. 3 is a sectional view of the actuator lock mechanism of FIG. A magnetic circuit including the upper yoke 13, the magnet 14, the 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 bonding or the like. 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 gap magnetic flux density from being lowered due to generation of magnetic flux disturbance in the magnetic circuit. In addition, stud 16
Since the upper yoke 13 is supported by 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 pressed into the lower yoke 15, the outer peripheral stopper 11 is
The lower yoke 15 is attached to the base 17 by providing a protruding portion at the bottom of the base 17 and providing a counterbore portion on the base 17 side, and fitting the protruding portion of the outer peripheral stopper 11 to the counterbore portion of the base 17.
The assemblability at the time of mounting on a vehicle can be improved.

FIG. 4 is a main plan view showing a second embodiment of the magnetic disk drive of the present invention. In FIG. 4, an actuator including a flexure 5, a coil holder 8, a coil 7, and the like is held by an actuator lock mechanism 25 via a magnetic pin 24. Actuator lock mechanism 25
Consists of a lock magnet 26 and a lock yoke 27
26 is fixed to a lock yoke 27 by bonding or the like, and the lock yoke 27 is fixed to an upper yoke 28. Mold part 29 supporting and fixing magnetic pin 24 to actuator
Is a low resilience synthetic resin. When the actuator is retracted or the actuator runs away, the acceleration energy of the actuator is absorbed by the mold portion 29 to protect 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 drive of the present invention, and is a sectional view of FIG.
The magnetic circuit including the upper yoke 28, the magnet 30, the lower yoke 31, and the like is protected in a cleaning environment by the base 17 and the cover 18. 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 bonding or the like, and the lock yoke 27 is fixed to the upper yoke 28 by the lock fixing screw 32. Fixed. In this embodiment, a half punch 33 is provided to improve the assemblability of the upper yoke 28 and the lock yoke 27.

An 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 the gap magnetic flux density from decreasing due to the occurrence of magnetic flux disturbance in the magnetic circuit. Further, the stud 16 (FIG. 4)
The upper yoke 28 is supported at four points, two of which are shown in FIG. 2), the outer peripheral stopper 34, and the actuator lock mechanism (the lock magnet 26 and the lock yoke 27), so that the stability of the magnetic circuit is further improved.

Further, the magnetic pin 24 is hollow for adjusting the balance of the actuator and adjusting the holding force of the actuator. 4 and 5, the magnetic pin 24 is supported and fixed on the outer peripheral side of the outer periphery of the magnet 30 in order to prevent the magnetic flux of the magnetic circuit from exerting an adverse effect on the magnetic pin 24. According to the experimental results of the present embodiment, if the distance from the outer peripheral side h of the magnet 30 in FIG. 4 (corresponding to the thickness h of the magnet 30 in FIG. 5) is larger than that, the magnetic flux of the magnetic circuit is It confirmed that there was no adverse effect on 24.

In FIGS. 4 and 5, one third or more of the entire length of the magnetic pin 24 is embedded in the mold portion 29 in order to strengthen the support fixing force of the magnetic pin 24. FIG. 6 is a main sectional view showing a third embodiment of the magnetic disk drive of the present invention. The magnetic circuit including the upper yoke 35, the magnet 36, the lower yoke 37, and the like is protected in a cleaning environment by the base 17 and the cover 18. 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 made of a lock yoke 41 by bonding or the like.
Further, the actuator lock mechanism (the lock magnet 40 and the 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 the present embodiment, the upper yoke 35 and the lock yoke 41
In order to improve the ease of assembling, two half punches 42 are provided. 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 nonmagnetic metal pin for the outer peripheral stopper 43, it is possible to prevent a gap magnetic flux density from being lowered due to the occurrence of magnetic flux disturbance in the magnetic circuit. Further, 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 has been improved.

Further, when retracting the actuator,
Alternatively, when the actuator runs away, the magnetic pin 38 includes a damper 44 in order to absorb the acceleration energy of the actuator more. That is, the acceleration energy of the actuator is absorbed only by the damper 44 during the retraction, and the acceleration energy of the actuator is absorbed by using the two-stage damping effect of the damper 44 and the mold section 45 during the runaway.

FIG. 7 is a main sectional view showing a fourth embodiment of the magnetic disk drive of the present invention. Upper yoke 46, magnet 47,
The magnetic circuit including the lower yoke 48 and the like is protected in a cleaning environment by the base 17 and the cover 18. The actuator is held by an actuator lock mechanism 50 via a magnetic pin 49. The actuator lock mechanism 50 is a 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 bonding 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
In order to improve the assemblability of the lock yoke 52, a half punch 54 is provided. 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 non-magnetic metal pin. By using a non-magnetic metal pin for the outer peripheral stopper 55, it is possible to prevent the gap magnetic flux density from being lowered due to the occurrence of magnetic flux disturbance in the magnetic circuit. Further, studs 16 (shown in FIG. 4) 2
Since the upper yoke 46 is supported by the three points of the individual and the outer peripheral stopper 55, the stability of the magnetic circuit is further improved.

When the actuator retracts or the actuator runs away, the damper 56 is attached to the magnetic pin 49 in order to absorb the acceleration energy of the actuator more.
Is provided. In addition, since the actuator lock mechanism frequently performs retraction, the lock yoke 52 is a leaf spring, and the acceleration energy of the actuator is absorbed only by the damper 56 fixed to the magnetic pin 49 during a normal retraction operation. In addition, when the actuator needs to attenuate more energy than during retraction, the lock yoke 52 also serving as a leaf spring and the damper 56 during runaway of the actuator,
The reliability of the magnetic disk drive is further improved by the three-stage attenuation effect provided by the mold portion 57.

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

FIG. 8 is a main sectional view showing a fifth embodiment of the magnetic disk drive of the present invention. Two magnetic disks 1
Is rotatably supported and fixed to the spindle motor 2 via the spindle motor spacer 58 and the clamper 3. The four magnetic heads 4 are supported and fixed to four flexures 5 via gimbals (not shown), respectively. The four flexures 5 further include an actuator spacer 59, an actuator spacer 60, a coil holder 8, , And is supported and fixed to the pivot shaft 6. 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 the magnetic head 4, the flexure 5, the actuator spacer 59, the actuator spacer 60, the coil holder 8, the coil 7, and the like is swingable around the pivot shaft 6 as a center of the rotation axis. It is fixed to the base 17 by 61. The magnetic circuit that drives the coil 7 is an upper yoke
It comprises a magnet 14 and a lower yoke 15 which are bonded and fixed to the upper yoke 13 and the like, 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 rotating, and the magnetic disk 1 rotates, so that the magnetic head 4 floats on the magnetic disk 1. The magnetic head 4 reads a servo pattern written on the magnetic disk 1 in advance, and outputs an output from the magnetic head 4 through an FPC (not shown; see FIG. 1) to a PCB (printed circuit board). Send to

FIG. 9 is an enlarged view of a main part of the actuator section. The pivot shaft 61 is provided with an opening 63 for clamping. By fitting an actuator clamper 64 into the opening 63, the four flexures 5, the actuator spacer 59, the actuator spacer 60, and the coil holder 8 are connected. It is supported and fixed to the pivot shaft 6. In addition, the pivot shaft 6 is formed by a pivot fixing screw 61.
Fixed to 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 holders 8), not only can the actuator be made thinner,
The thickness of the magnetic disk device itself can be reduced. Further, it is not necessary to redesign the arm due to the difference in the thickness of the magnetic head 4, and only the thickness of the actuator spacers 59 and 60, the coil holder 8 and the like need to be changed. The flexure 5 and the like can use common components, and the cost of the magnetic disk device can be reduced.

FIG. 10 shows a sixth embodiment of the magnetic disk drive of the present invention.
FIG. 10 is a main cross-sectional view showing the embodiment of the present invention. The difference from FIG. 9 is that a seal ring is used as the actuator clamper 65. Even if a seal ring is used as the actuator clamper 65, the effect of the present invention that the thickness of the magnetic disk device can be reduced is not lost. In addition, flexure 5 and spacers (actuator spacers 59 and 6)
0, a coil holder, etc.).

FIG. 11 is an exploded plan view of the actuator section. The actuator is an HGA U comprising a pivot shaft 6, a magnetic head 4, a flexure 5, a mount 66, and the like.
P (head gimbal assembly up) 67; coil holder 8 to which coil 7 and magnetic pin 9 are bonded and fixed; mounting direction to magnetic disk is HGA UP67
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. As shown in FIG. Flexure 5 has a thickness of about 8
The gimbal portion 69 for supporting and fixing the magnetic head 4 is formed of a flexure 5 having a thickness of about 40 μm by partial etching in order to improve the resonance point of the HGA. A caulking claw 72 is provided on the flexure 5 to fix a tube 71 that protects the lead wire 70 of the magnetic head 4, and as a reinforcing material when fixing the flexure 5 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 not required, so that the HGA can be made thinner, It is possible to reduce the thickness of the actuator and the thickness of the magnetic disk device. In this embodiment, the mount 66 is used as a reinforcing material for the flexure 5. However, by omitting the mount 66, the thickness of the magnetic disk device can be reduced and the cost of the magnetic disk device can be further reduced.

In FIG. 12, the gimbal portion 69 is partially etched from 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 if it is a gimbal, the effect of the present invention is not lost. FIG. 13 is a main plan view showing a seventh embodiment of the magnetic disk drive of the present invention.

Reference numerals 1 to 20 denote the same parts as in FIG. In the known example, polyethylene terephthalate was used as a base material of the magnetic disk 1 and a disk having a thickness of 72 μm or more was used. In this embodiment, the substrate of the magnetic disk 1 is polycarbonate which is a thermoplastic resin. It is about 0.7 mm and about 48 mm (1.8 inches) in diameter. The HGA DOWN 68 comprising the magnetic head 4 and the flexure 5 is disposed on the front surface of the magnetic disk 1, and the HGA UP 67 is disposed on the back surface of the magnetic disk 1.
OWN 68 and HGA UP 67 are arranged at an angle of θ. In the present embodiment, the angle θ is set to 65 degrees in order to improve the reliability and assemblability of the magnetic disk drive.

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 substrate shape of the magnetic disk 1 is the same, by changing the substrate material of the magnetic disk 1 from aluminum to polycarbonate, the load on the spindle motor 2 is reduced by about half both at startup and during steady rotation. Here, the load applied to the spindle motor 2 is 9
0% is the inertia (moment of inertia) of the magnetic disk 1
It is. That is, the start-up time of the spindle motor 2, which is the time from when the power is turned on until the magnetic disk 1 reaches the steady rotation, can be reduced by half in the magnetic disk device of the present invention.

Further, when the magnetic disk 1 rotates at a steady speed, the steady load of the spindle motor 2 is reduced by half, so that the drive current of the spindle motor 2 can be reduced by half with the magnetic disk device of the present invention, thereby reducing the power consumption. It is possible to realize a magnetic disk drive with electric power. In the embodiment, in order to allow the magnetic disk 1 to warp, the HGA DOWN 68
And the HGA UP 67 are arranged at an angle of θ, but the angle of θ may be set to 0 degree as shown in FIG. 1 depending on the thickness of the magnetic disk 1. Specifically, when the diameter of the substrate of the magnetic disk 1 is 48 mm, and the thickness of the substrate is 0.7 mm or more, the angle θ is set to 0 as shown in FIG.
Experiments have confirmed that the warpage of the magnetic disk 1 was within an allowable range.

FIG. 14 shows an eighth embodiment of the magnetic disk drive of the present invention.
FIG. 4 is a main plan view showing the embodiment of FIG. Reference numerals 1 to 20 correspond to FIG.
The same parts are shown. Here, in the present embodiment, the substrate of the magnetic disk 1 is polycarbonate, which is a thermoplastic resin, having a thickness of about 0.7 mm and a diameter of about 48 mm (1.8 mm).
Inches). The HGA DOWN 68 comprising the magnetic head 4 and the flexure 5 is disposed on the front surface of the magnetic disk 1, and the HGA UP 67 is disposed on the back surface of the magnetic disk 1.
OWN68 and HGA UP67 are arranged at an angle of 65 degrees or more.

Further, the surface of the magnetic disk 1 is HGA
An inner shipping area 73 for DOWN 68 and an outer shipping area 74 for HGA UP 67 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, 74 in FIG. 14) is provided on each of the front and back surfaces of the magnetic disk 1. However, these shipping areas may be provided on the front and back of the magnetic disk 1 by two inner and outer circumferences. Good.

In this embodiment, the substrate of the magnetic disk 1 is made of polycarbonate, which is a thermoplastic resin.
It has been confirmed by experiments that the same effect can be obtained even when a 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 the substrate of the magnetic disk 1 is made of polyethylene or the like.

Further, in the above-described known example, polyethylene terephthalate was used as the base material of the magnetic disk and the disk thickness was 72 μm or more. However, since the magnetic disk was too thin, the distance between the magnetic disk and the cover was reduced. However, there is a restriction that the distance between the magnetic disk and the base must be substantially equal. However, in this embodiment, since the thickness of the magnetic disk 1 is 0.7 mm, 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 restricted, 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 drive of the present invention.
FIG. 4 is a main cross-sectional view showing the example of FIG. One magnetic disk 1 is rotatably supported and fixed to the spindle motor 2 via a spindle motor spacer 58 and a clamper 3. The two magnetic heads 4 are each supported and fixed to two flexures 5 via a gimbal (not shown). Further, the two flexures 5 are pivotally moved by an actuator clamper via a coil holder 8. 6
It is fixedly supported. 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,
The actuator including the actuator clamper 64, the coil holder 8, the coil 7, and the like can swing about the pivot shaft 6 as the center of the rotation axis. The pivot shaft 6 is fixed to the base 17 by a pivot fixing screw 61.
The magnetic circuit for driving the coil 7 is composed of the upper yoke 13 and the upper yoke.
The magnet 14 and the lower yoke 15 are fixed to the base 17 by adhesion. 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 rotating, and the magnetic disk 1 rotates, so that the magnetic head 4 floats on the magnetic disk 1. The magnetic head 4 reads a servo pattern written on the magnetic disk 1 in advance, and sends an output from the magnetic head 4 to the PCB 62 through an FPC (not shown; see FIG. 1).
In this embodiment, the bearing of the spindle motor 2 is
By using a fluid bearing different from the conventional roller bearing and making the magnetic circuit space inside the spindle motor 2 large, low power consumption of the magnetic disk drive is realized.

Further, by using the fluid bearing, the shaft of the spindle motor 2 can be designed up to a diameter of about 5 mm, so that 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 resin-made magnetic disk substrate by using a permanent magnet for fixing an actuator, (1) a spring or a wind As a result, there is no need to add or subtract a 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 an increase in settling time due to occurrence of overshoot or undershoot during settling when switching from speed control to position control under the influence of an external force due to a spring or wind force. (3) There is no need for a circuit configuration or algorithm for correcting the effect of external force due to a spring or wind force. (4) When an external force is applied by a spring or wind force, a mechanical resonance point harmful to speed / position control is not generated due to the natural frequency of the spring or wind receiver. (5) Since no electromagnetic device is used, power consumption and heat generation can be minimized. (6) In Japanese Patent Application Laid-Open No. 4-67347, the magnetic disk substrate is thin and the magnetic head is of a negative pressure contact type, and the arrangement of the magnetic disk in the magnetic disk drive is restricted in design. No restrictions are needed. (7) The load on the spindle motor is halved, the startup time is short, and low power consumption is possible.

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

[Brief description of the drawings]

FIG. 1 is a main part plan view showing a first embodiment of a magnetic disk drive of the present invention.

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

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

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

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

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

FIG. 7 is an enlarged sectional view of a main part showing a fourth embodiment.

FIG. 8 is a sectional view of a main part showing a fifth embodiment.

FIG. 9 is an enlarged sectional view of a main part 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 an isolated manner.

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

FIG. 13 is a main part plan view showing a seventh embodiment.

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

FIG. 15 is a sectional view of a main part showing a ninth embodiment;

FIG. 16 is a plan view showing the internal structure of a conventional magnetic disk drive.

[Explanation of symbols]

 DESCRIPTION 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 Magnets 22, 27, 41, 52 Lock yokes 23, 32, 53 Lock fixing screws 33, 42, 54 Half punch 59, 60 Actuator spacer 64, 65 Actuator clamp 69 Gimbal part 73 Inner circumference shipping area 74 Outer circumference shipping area

Claims (11)

(57) [Claims] At least one magnetic disk rotatably supported on at least one magnetic disk, at least one magnetic head corresponding to the magnetic disk, and a magnetic head attached to an end of the magnetic disk, and a rotatable shaft mounted on a pivot shaft. A supported flexure, a coil provided on a side opposite to the flexure about the pivot axis via a coil holder, and a first yoke to which a magnet provided at a position corresponding to the coil is fixed. 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 periphery of the coil by a molded part, and a magnetic pin And a lock magnet that can be held in contact when the magnetic disk device is not operating , wherein the lock yoke is the first yoke. Reinforcement material that supports
Serves, by applying a voltage to the coil during operation, the magnetic head, flexure, a coil holder, the actuator comprising a coil, a magnetic disk apparatus which is characterized in that the releasable from the lock mechanism. Wherein only set the outer peripheral stopper for restricting the swing range of the actuator, the reinforcing member for supporting the first yoke and
2. The magnetic disk drive according to claim 1, wherein: 3. The magnetic disk drive according to claim 1, wherein the lock yoke is fixed to the first yoke. 4. The magnetic disk drive according to claim 1, wherein the mold part is a shock absorbing material. 5. The device according to claim 1, wherein the magnetic pin also serves as a counterweight of the actuator.
Or the magnetic disk device according to 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. A spindle for rotating a magnetic disk.
A motor, wherein the bearing portion of the spindle motor is a fluid shaft
Claim 1, 2 , 3, 4 , 5,
8. The magnetic disk drive according to 6 or 7. 9. At least one sheet rotatably supported
Magnetic disk and at least the corresponding magnetic disk
Also rotate one magnetic head and this magnetic disk
Spindle motor, and supports and fixes the magnetic head.
Gimbal and flexure supporting and fixing the gimbal
And a flexure support for supporting and fixing the flexure
Fixing means, a coil for driving the magnetic head,
A coil holder for supporting and fixing the coil;
, A second yoke, and adhesively fixed to the first yoke
At least one magnet, the first yoke and the
At least one gap forming a gap between the second yoke and the second yoke;
Studs and at least said studs are fixed to a base.
A single fixing screw and a cover engaging with the base
And the magnetic head, the gimbal, and the flexure
And the flexure support fixing means, the coil and the coil
The actuator consisting of the file holder can be held in a timely manner
And a functional actuator lock mechanism.
A mold part for supporting and fixing the magnetic pin;
The lock pin fixed to the yoke and the magnetic pin
An actuator lock consisting of a lock magnet
Lock mechanism to regulate the swing range of the actuator.
Outer peripheral stopper, wherein the lock yoke is
1 is fixed to the yoke, and the magnetic pin is
Impact on the magnetic pin
With an absorbent material, the outer peripheral stopper is made of a non-magnetic metal
The outer peripheral stopper supports the first yoke
The thickness of the magnet from the outermost peripheral side of the magnet also serves as a reinforcing material
The magnetic pin is supported and fixed at the outer periphery for more than
The flexure having a substantially circular opening for support,
In order to fix this flexure at least one
A spacer having a circular opening, and the flexure
Actuator clamp that fixes the spacer and the spacer together
A lamper as the flexure supporting and fixing means,
The disk substrate is made of a thermoplastic resin.
A magnetic disk drive that. 10. In front of a flexure sandwiching a magnetic disk
It is located at a different position from the perpendicular to the magnetic disk.
10. The magnetic disk drive according to claim 9, wherein: 11. The bearing portion of a spindle motor is a hydrodynamic bearing.
11. The magnetic disk drive according to claim 9, wherein: