JP3351321B2 - 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 magnetic disk drive configured to press a head arm of a head carriage mechanism supporting an upper and lower head by a spring member.

[0002]

2. Description of the Related Art For example, an electronic device such as a personal computer or a word processor is equipped with a magnetic disk device as a means for recording information. When a disk cartridge as a recording medium is mounted in the magnetic disk device, the magnetic disk accommodated in the disk cartridge is driven to rotate, and the magnetic head slides on the magnetic disk to perform magnetic recording and reproduction.

In the above-described magnetic disk drive, a disk holder into which a disk cartridge is inserted and a disk holder are slid by the operation of inserting the disk cartridge to move the disk holder from a cartridge insertion / ejection position to a cartridge mounting position. It has a configuration having a recording medium transport mechanism composed of a slider. Further, the disk cartridge inserted into the disk holder is mounted at the cartridge mounting position, and the head arm of the head carriage descends, so that the magnetic head slides on the upper and lower surfaces of the magnetic disk. Thus, recording and reproduction by the magnetic head can be performed. The end of the torsion spring that presses the head arm presses an extension of the center line of the magnetic head.

Accordingly, the head arm is rotationally urged toward the magnetic disk by the torsion spring and has projections on both sides that come into contact with the upper surface of the disk holder. Then, the magnetic head is rotated so as to approach the recording surface of the magnetic disk. In the magnetic disk drive, the storage capacity of the magnetic disk is increased by increasing the disk rotation speed to increase the storage capacity, and the storage capacity of the magnetic disk is being increased. In a large-capacity magnetic disk device of this type, a levitation force is applied to the magnetic head by an air flow generated as the magnetic disk rotates at a high speed, so that the magnetic head is magnetically lifted slightly above the surface of the magnetic disk. Recording and reproduction can be performed.

[0005] The head carriage supporting the magnetic head is configured to move in the disk radial direction by a driving force from a voice coil motor to perform a seek operation of the magnetic head.

[0006]

However, in the above-mentioned conventional magnetic disk drive, the head arm of the head carriage is urged by the spring force of the torsion spring and pivots toward the magnetic disk, so that the upper and lower magnetic heads become magnetic. When sliding on the disk, the head arm vibrates due to friction between the head surfaces of the upper and lower magnetic heads and the upper and lower surfaces of the magnetic disk.

Therefore, in a conventional magnetic disk drive,
A vibration preventing member made of a sheet-like elastic material for absorbing vibration is interposed between the base end of the head arm and the support base of the head carriage main body. However, since the vibration preventing member as described above is expensive,
It was disadvantageous in terms of cost reduction. In addition, it has been considered to shift the resonance frequency depending on the disk rotation speed by using a molding material for the head arm having a different resonance frequency. Since the state of friction with the lower surface is different, it has been difficult to support all types of magnetic disks.

Accordingly, it is an object of the present invention to provide a magnetic disk drive which solves the above problem.

[0009]

In order to solve the above problems, the present invention has the following features. The present invention supports a pair of upper and lower magnetic heads for writing information on a recording surface formed on the upper and lower surfaces of a disk-shaped recording medium or reading information recorded on the recording surface, and the lower magnetic head. Head carriage body, a head arm rotatably supported at the rear of the head carriage body, a spring member for urging the head arm toward the recording / reproducing position, and moving the head carriage body in the disk radial direction. Actuator and the head arm
Move the magnetic head close to or close to the disk-shaped recording medium.
Is a disk device having a lifter to be separated ,
Shifting one direction orthogonal to the moving direction of the head carriage body a pressing position by the spring member from the center of the upper and lower magnetic heads, and the spring member said lifter
From the other direction opposite to the shifting direction to the head arm
The head arm is moved up and down by contact.

[0010] Therefore, according to the present invention, and shifted the pressing position by the spring member from the center of the upper and lower magnetic heads in a direction perpendicular to the moving direction of the head carriage body, and
Lift the lifter from the other direction on the opposite side
To move the head arm up and down in contact with the
The resonance frequencies on the left and right sides of the head arm can be shifted, and vibration of the head arm due to friction between the head surfaces of the upper and lower magnetic heads and the upper and lower surfaces of the magnetic disk can be suppressed.
In addition, vibration of the head arm can be prevented at low cost without adding a special vibration isolating member or the like.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic disk drive according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of one embodiment of a magnetic disk drive according to the present invention.
FIG. 2 is an exploded perspective view showing a schematic configuration of the magnetic disk drive. As shown in FIGS. 1 and 2, the magnetic disk drive 11 includes a disk holder 12 into which a disk cartridge (not shown) is inserted, and a slider 13 that slides in the front-rear direction to move the disk holder 12 up and down. It is mounted on a frame 14. The slider 13 is slidably provided on the frame 14 in the directions A and B, and slides in the direction A by inserting a disk cartridge to lower the holder 12 from the cartridge insertion / ejection position to the cartridge mounting position.

On a flat surface 14a of the frame 14, a turntable 15 driven by a motor for rotating a disk is provided.
Head carriage 18 supporting magnetic heads 16 and 17
Are provided. A circuit board (not shown) having a control circuit is attached to the lower surface of the frame 14. The head carriage 18 has a carriage body 19 that supports the lower magnetic head 16 on the top surface of the tip and a carriage body 19 that supports the upper magnetic head 17 on the bottom surface of the tip.
And a head arm 20 rotatably mounted on the head arm 20.

The head carriage 18 is provided movably guided by guide shafts 21 and 24 extending in the front-rear direction (A and B directions). Bearing portions 18a and 18b on which the guide shafts 21 and 24 are slidably fitted are provided on the left and right side surfaces of the head carriage 18, respectively. The bearing 18a is formed of a circular hole through which the main guide shaft 21 penetrates.
8 is a main bearing for regulating the moving direction, the left-right direction, and the height position. Further, since the bearing portion 18b is a U-shaped bearing to which the guide shaft 21 is fitted, the bearing portion 18b does not restrict the moving direction and the left-right direction, but restricts only the height position of the head carriage 18.

The head carriage 18 moves in the directions A and B while being guided by the guide shafts 21 and 24 by a driving force applied from a voice coil motor 52 as an actuator. Thus, the magnetic heads 16 and 17 supported by the head carriage 18 are
The magnetic recording / reproducing device is brought into sliding contact with a desired track of a magnetic disk (not shown) stored in a disk cartridge.
Playback can be performed.

The actuator for driving the head carriage 18 is not limited to the voice coil motor 52. For example, a lead screw screwed to the head carriage 18 may be driven by a stepping motor. A damper mechanism 31 is provided on the lower surface of the slider 13. That is,
On the lower surface of the slider 13, a shaft 34 for rotatably supporting the damper plate 32 of the damper mechanism 31 and a hook 35 for hooking one end of the torsion spring 33 are provided.

The damper mechanism 31 is a mechanical damper mechanism that urges the slider 13 so as to reduce the sliding operation of the slider 13 by using a spring force instead of an oil damper. That is, the damper mechanism 31 includes a damper plate 32 rotatably provided on the lower surface of the slider 13 and a torsion spring 33 for urging the damper plate 32.

The damper mechanism 31 urges the slider 13 in the direction opposite to the moving direction (B direction) at the initial stage of the movement of the disk holder 12 from the cartridge insertion / ejection position to the cartridge mounting position, and the slider 13 slides. When the damper plate 32 rotates by a predetermined amount or more during the movement, the slider 13 is configured to be urged in the movement direction (A direction). Therefore, at the time of the disk mounting operation, the damper mechanism 31 uses the spring force of the torsion spring 33 to move the slider 1.
The operation of Step 3 is decelerated to reduce the descent speed of the disk holder 12, that is, the disk mounting speed.

Next, the configuration of each main part configured as described above will be individually described. The disk holder 12
It comprises a top plate 12a, and cartridge guide portions 12b and 12c which are bent to hold the disk cartridge from both sides of the top plate 12a. Therefore, a space surrounded by the top plate 12a and the cartridge guide portions 12b and 12c on both sides becomes a cartridge insertion portion.

The top plate 12a of the disc holder 12 is provided with an opening 12d for the head carriage 18 to move, and a lifter 25 abutting on the right side of the opening 12d comes into contact with a protruding portion 20a protruding from both sides of the head arm 20. It is movably mounted. Therefore, the head arm 20
Is provided to intermittently move the magnetic head 17 up and down in conjunction with the up and down operation of the disk holder 12. Therefore, the disk holder 12, the head arm 20,
The lifter 25 and the like constitute a head moving mechanism.

The lifter 25 has a shaft 25b projecting from both ends of a main body 25a.
It is supported by the support portion 12h standing upright at 2a. Therefore, the lifter 25 is attached rotatably in the E and F directions orthogonal to the carriage movement direction (A and B directions). Further, a pair of engaging pins 12e for engaging with the slider 13 is provided on both sides of the disc holder 12, and guide portions 12f, 12
g is protruding. The guide portions 12f and 12g are fitted in guide grooves 14d and 14e provided in the side walls 14b and 14c of the frame 14, and guide the lifting and lowering operation of the disk holder 12.

The top plate 12a of the disk holder 12
The lifter 25 is rotated so that the locking portion 25c comes into contact with the protruding portion 20a of the head arm 20 and lowers the head arm 20 stepwise as the disk holder 12 moves up and down as described later. I do. In addition, the locking portion 25
c is formed to extend from the innermost track position to the outermost track position of the disk, that is, the length corresponding to the stroke of the head carriage 18.

The slider 13 is slidably mounted above the disk holder 12 and has a J-shaped flat plate 13.
a and the side surface 13 bent downward from both sides of the flat plate 13a
b, 13c and inclined grooves 13d provided on the side surfaces 13b, 13c to which the engaging pins 12e of the disc holder 12 fit.
And an engagement hole 13e that engages with a protrusion 14f that projects from the center of both sides of the frame 14. Furthermore, slider 1
3 has a protruding piece 13g protruding to the front right side, and an eject button 40 is fixed to the protruding piece 13g. The slider 13 is urged in the direction A by a coil spring 41.

FIG. 3 is a front view of the disk drive. FIG.
As shown in FIG. 2, a front bezel 27 having a disc insertion slot 26 is attached to the front end of the frame 14. On the right side of the upper end of the front bezel 27, a concave portion 27a into which the eject button 40 is slidably fitted is provided. A flap 28 for closing the disc insertion opening 26 from the inside is provided on the back side of the front bezel 27 so as to be rotatable in the opening and closing direction.

FIG. 4 shows the disk holder 12 and the slider 13.
It is a side view which shows the state which was combined. As shown in FIG. 4, the engagement pin 12e of the disk holder 12 is fitted in the inclined groove 13d of the slider 13, so that
The sliding operation of the slider 13 drives the engaging pin 12e along the inclined groove 13d. Therefore, when the slider 13 slides in the direction B, the disk holder 12 moves up to the cartridge insertion / ejection position, and when the slider 13 slides in the direction A, it moves down to the cartridge mounting position. Therefore, the recording medium transport mechanism is constituted by the disk holder 12 and the slider 13.

Here, description will be made returning to FIG. The latch mechanism 36 includes a latch lever 38 rotatably supported on the upper surface of the disk holder 12 and a coil spring 41 for urging the latch lever 38 to rotate counterclockwise. In addition, the coil spring 41 is connected to the slider 13.
And a latch lever return spring that biases the latch lever 38.

The latch lever 38 is used to open and close a shutter (not shown) of the disk cartridge.
8a and an arcuate hook 38b for hooking the hook 13h of the slider 13. When the disk cartridge is inserted into the disk holder 12, the latch lever 38 is pressed by the front end of the disk cartridge and rotates clockwise. Then, when the arc-shaped engaging portion 38b is separated from the engaged portion 13h of the slider 13, the slider 13 urged by the coil spring 41 slides in the direction A.

As the latch lever 38 rotates in this manner, the tip 38c of the lever portion 38a presses a shutter (not shown) of the disk cartridge in the opening direction, and the magnetic heads 16 and 17 slide on the magnetic disk. It can be so. Further, when the eject button 40 is pressed in the direction B and the slider 13 slides in the same direction, the locking of the locking portion 38b which has been in contact with the side surface of the locked portion 13h of the slider 13 is released. The latch lever 38 rotates counterclockwise by the spring force of the coil spring 41.

Reference numeral 45 denotes a carriage stopper, which locks the head carriage 18 at the time of ejection, as will be described later, so that the magnetic heads 16 and 17 can be driven by a magnetic disk (not shown).
This is a lock member for preventing sliding contact. The carriage stopper 45 is attached in a direction extending in the A and B directions so that the main body 45a faces the right side of the guide shaft 24, and is provided with a bearing (not shown) formed on the frame 14. ), It is rotatably supported in the E and F directions similarly to the lifter 25 described above. The carriage stopper 45 has a rack 45b for locking the head carriage 18 and a V-shaped recess 45c to which an engaging pin 25d protruding from an end of the lifter 25 is engaged.

Incidentally, on the right side of the head carriage 18,
A movable rack 56 facing the rack 45b is provided. The rack 45b is formed to extend from the innermost track position of the disk to the outermost track position, that is, the length corresponding to the stroke of the head carriage 18. Therefore, the carriage stopper 45
By rotating in the direction E, the rack 45b meshes with the movable rack 56 to lock the head carriage 18.

Reference numeral 46 denotes a stopper connecting lever,
4 is rotatably supported by a shaft 44 provided thereon. The stopper coupling lever 46 has an arm portion 46a extending in the direction A and a spring locking portion 46b extending laterally substantially perpendicular to the direction A. The base portion 45 of the carriage stopper 45 is provided at the base of the arm portion 46a.
An oval engaging hole 46c is provided for engaging a protruding pin 45d protruding from the rear portion of the upper surface of FIG.

Spring locking portion 46 of stopper connecting lever 46
One end 47a of the torsion spring 47 is hung on b. The other end 47b of the torsion spring 47 is in contact with the rear inner wall of the frame 14. Therefore, the stopper coupling lever 46 is urged clockwise, that is, in the carriage locking direction, by the spring force of the torsion spring 47.

A solenoid 48 is excited by a command from a control circuit (not shown) to suck the plunger 49 in the direction D. The end of the plunger 49 is connected to the tip of the arm 46a of the stopper connecting lever 46. Therefore, when the solenoid 48 is excited and the plunger 49 is attracted in the direction D, the stopper coupling lever 46 rotates in the counterclockwise direction, that is, in the carriage unlocking direction.

Reference numeral 50 denotes a holding member, which is formed of sheet metal so as to press and fix the guide shaft 24, the stopper coupling lever 46, the solenoid 48, and the torsion spring 47 from above when fixed to the frame 14.
Reference numeral 51 denotes a guide shaft pressing member.
Is fixed to the frame 14 in a state where the end of the frame is pressed in the direction D perpendicular to the axial direction.

Reference numeral 52 denotes a voice coil motor, and a coil 53
Are integrally provided on the left side surface of the head carriage 18. The voice coil motor 52 is provided on the left side of the guide shaft 21 disposed near the center of gravity of the head carriage 18. Therefore, the head carriage 18 can be driven in the A and B directions by one voice coil motor 52 to perform the seek operation of the magnetic heads 16 and 17. Therefore, the head carriage 1
The head carriage 18 is made smaller than the one in which a pair of voice coil motors are provided on both sides of the head 8, and the moving space of the carriage 18 becomes smaller, which can contribute to the downsizing of the magnetic disk device 11.

Here, the configuration of the peripheral portion of the head carriage 18 will be described. FIG. 5 is an enlarged plan view showing the periphery of the head carriage 18 in the recording / reproducing mode. As shown in FIG. 5, the head arm 20 is supported on a support table 57 of the head carriage 18 via a leaf spring 58 so as to be rotatable in the vertical direction. The head arm 20 is attached downward by a pressing portion 60a extending in the direction A from a torsion spring 60 (spring member) hooked in a state of being wound around a shaft 59 provided at the rear portion of the support base 57. It is being rushed. The spring member for urging the head arm 20 is not limited to the torsion spring 60, and the head arm 20 may be urged by a spring member having any other shape.

The pressing portion 60a is in contact with the concave portion 20b formed on the upper surface of the head arm 20 in a fitted state, and presses a position shifted from the center line of the magnetic heads 16 and 17 toward the disk entry side. As a result, since the distance between the left side surface and the right side surface of the head arm 20 differs with respect to the pressing position of the pressing portion 60a, the left vibration system 20A and the right vibration system 20B that are divided in the left and right directions around the pressing portion 60a.
And the resonance frequency differs.

Therefore, the pressing portion 6 of the torsion spring 60
0a by pressing the head arm 20 with the magnetic head 1
Because it was shifted to the disk entry side from the center line of 6, 17
The flapping of the magnetic heads 16 and 17 can be suppressed when the disk enters, and the disk can be prevented from vibrating due to the flapping of the magnetic heads 16 and 17 being transmitted downstream in the disk rotation direction.

The projecting portion 20 a projecting laterally from the head arm 20 is pressed against the upper surface of the locking portion 25 c of the lifter 25 by the spring force of the torsion spring 60. Lifter 25
Since the engagement pin 25d protruding from the end is engaged with the V-shaped concave portion 45c provided at the end of the carriage stopper 45, the carriage stopper 4c will be described later.
5 intermittently and interlocks with the turning operation of No. 5.

Plunger 4 sucked by solenoid 48
Reference numeral 9 is engaged with the tip end 46d of the arm portion 46a of the stopper connecting lever 46. Also, the stopper connecting lever 4
In 6, the spring locking portion 46 b is urged clockwise by the spring force of the torsion spring 47. Therefore, the carriage stopper 45 in which the protruding pin 45 d is engaged with the engagement hole 46 c of the stopper coupling lever 46 is provided with the torsion spring 47.
Pivots in the carriage locking direction (E direction) due to the spring force of. Thereby, the rack 4 of the carriage stopper 45
5b engages with the movable rack 56 of the head carriage 18 to lock the head carriage 18.

At the rear of the frame 14, there is provided an eject detection switch 54 for detecting that the slider 13 has slid in the eject direction. The eject detection switch 54 is provided with a slider 13 that slides in the same direction when the eject button 40 is pressed in the B direction.
And is switched to the closed state. Next, the configuration of the head carriage 18 and the voice coil motor 52 for driving the head carriage 18 will be described.

FIG. 6 is a right side view of the head carriage 18. FIG. 7 is a bottom view of the carriage body. FIG. 8 is a left side view of the head carriage 18. As shown in FIG. 6 to FIG.
Has a carriage main body 19 that supports the lower magnetic head 16 and a head arm 20 that supports the upper magnetic head 17 and is rotatably attached to the carriage main body 19 as described above.

The right side of the carriage body 19 is partially removed. That is, a concave portion 19 a is provided on the right side surface of the carriage main body 19 to adjust the position of the center of gravity of the head carriage 18. Therefore, the center of gravity G of the head carriage 18 is located near the bearing 18a to which the main guide shaft 21 is fitted. The coil 53 of the voice coil motor 52 is integrally mounted on the rear left side surface of the carriage body 19. The coil 53 is provided so as to be near the bearing portion 18a provided on the left side surface of the carriage body 19. That is, the driving force from the coil 53 is moved in the vicinity of the guide shaft 21 fitted into the bearing portion 18a.
Is given to

FIG. 9 is a plan view showing a state in which the head carriage 18 is mounted. FIG. 10 is a front view showing an attached state of the head carriage 18. As shown in FIGS. 9 and 10, the coil 53 of the voice coil motor 52 has a carriage so as to generate a driving force F in the A and B directions near the bearing portion 18 a to which the main guide shaft 21 is fitted. It is attached to the rear left side of the main body 19.

On the other hand, the center of gravity G of the head carriage 18 is
In the plan view shown in FIG. 9, a triangular range which is located near the guide shaft 21 and connects a pair of bearings 18 a formed on the left side of the head carriage 18 and a bearing 18 b formed on the right side of the head carriage 18. Located within. In addition, the head carriage 1
8 is applied to the main guide shaft 2
1 and near the left side of the bearing portion 18a. The center of gravity G of the head carriage 18 is located near the right side of the guide shaft 21 and the bearing 18a. for that reason,
With respect to the distance La between the driving force F from the coil 53 and the center of gravity G, the guide shaft 21
At a substantially intermediate position.

The head carriage 1 is moved from the coil 53 to the head carriage 1.
8, the drive force F acts on the left side of the guide shaft 21 and the bearing portion 18a in the front view shown in FIG. 10, and the center of gravity G of the head carriage 18 is located near the right side of the guide shaft 21 and the bearing portion 18a. It is located in.
Therefore, the driving force F from the coil 53 is also shown in FIG.
The guide shaft 21 with respect to the distance La between the
It is provided at a substantially intermediate position between the point of application of the driving force F and the center of gravity G.

Further, the coil 53 is connected to the head carriage 1
8 is provided near the left side of the guide shaft 21 and the bearing portion 18a on the entry side in the disk rotation direction of FIG. Rocking
Is prevented. Therefore, the driving force F from the coil 53 acts in the direction in which the guide shaft 21 extends, and a force that causes the head carriage 18 to swing (twist) in the left-right direction with respect to the guide shaft 21 is less likely to be generated. The head carriage 18 can also be moved stably by the voice coil motor 52.

The flexible wiring board 61 pulled out from the end 53 a of the coil 53 is connected to a connector 62 provided on the frame 14. At this time, the flexible wiring board 61 is curved as shown in FIG. 9, and an elastic restoring force is applied to the coil 53 as a load. However, as described above, since the driving force F from the center of gravity G of the head carriage 18, the guide shaft 21, the bearing 18a, and the coil 53 is close to each other, the flexible wiring board 61
Head carriage 1 with elastic restoring force from
8 is secured.

In the case where the head carriage 18 vibrates due to the seek operation, the coil 53
A balancer weight 63 (indicated by hatching in FIG. 9) is fixed to the end portion 53a. As a result, the vibration frequency of the head carriage 18 shifts, and the resonance phenomenon is prevented. Further, since the pressing portion 60a of the torsion spring 60 is shifted from the center line L of the magnetic heads 16 and 17 by a distance S (for example, S = 0.4 mm or more) toward the disk, the left vibration system of the head arm 20 The vibration frequency differs between the right and left side vibration systems. As described above, when different vibration frequencies are generated on the left and right sides of the head arm 20, the respective frequencies act so as to cancel each other, so that the vibration of the entire head arm 20 is reduced.

Therefore, when a magnetic disk (not shown) that rotates between the magnetic heads 16 and 17 passes, the head arm 20 causes resonance due to the magnetic disk passing while deforming between the magnetic heads 16 and 17. The phenomenon is less likely to occur. In the above embodiment, the configuration in which the slider slides above the disk holder is described as an example. However, the present invention is not limited to this, and the present invention is also applied to a configuration in which the slider slides below the disk holder. can do.

[0050]

As described above, according to the present invention, the pressing position by the spring member is shifted from the center position of the upper and lower magnetic heads in one direction orthogonal to the moving direction of the head carriage main body.
And the lifter is on the other side opposite to the direction in which the spring member is shifted.
Abut the head arm from the direction
That reason, since the distance to the left and right sides with respect to the pressing position of the pressing portion of the spring member are different, the resonance frequency at the left side vibration system and right vibration system varies. Therefore, when different vibration frequencies are generated on the left and right sides of the head arm, the respective frequencies act so as to cancel each other, so that the vibration of the entire head arm is reduced. In addition, the resonance frequencies on the left and right sides of the head arm can be shifted, and vibration of the head arm due to friction between the head surfaces of the upper and lower magnetic heads and the upper and lower surfaces of the magnetic disk can be suppressed. Further, since the pressing position of the spring member is shifted toward the disk entry side from the center line of the magnetic head, fluttering of the magnetic head can be suppressed at the time of entry of the disk, and the fluttering of the magnetic head is transmitted to the downstream side in the disk rotation direction, and Can be prevented from vibrating. Moreover, Ru inexpensive to prevent the occurrence of vibration head arm without special vibration isolation member or the like.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a magnetic disk drive according to the present invention.

FIG. 2 is an exploded perspective view showing a schematic configuration of a magnetic disk device.

FIG. 3 is a front view of the disk device.

FIG. 4 is a side view showing a state where the disk holder and the slider are combined.

FIG. 5 is an enlarged plan view showing a peripheral portion of a head carriage in a recording / reproducing mode.

FIG. 6 is a right side view of the head carriage.

FIG. 7 is a bottom view of the carriage body.

FIG. 8 is a left side view of the head carriage.

FIG. 9 is a plan view showing an attached state of a head carriage.

FIG. 10 is a front view showing an attached state of a head carriage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic disk drive 12 Holder 13 Slider 14 Frame 16, 17 Magnetic head 18 Head carriage 21, 24 Guide shaft 25 Lifter 25d Engagement pin 31 Damper mechanism 33 Torsion spring 36 Latch mechanism 38 Latch lever 45 Carriage stopper 46 Stopper coupling lever 47 Torsion spring 48 Solenoid 49 Plunger 50 Holding member 51 Guide shaft pressing member 52 Voice coil motor 53 Coil 56 Movable rack

Claims (1)

(57) [Claims] 1. A pair of upper and lower magnetic heads for writing information on a recording surface formed on the upper and lower surfaces of a disk-shaped recording medium or reading information recorded on the recording surface, and the lower magnetic head. A supporting head carriage main body, a head arm rotatably supported at a rear portion of the head carriage main body, a spring member for urging the head arm toward a recording / reproducing position, and a head radially moving the head carriage main body in a disk radial direction. An actuator to be moved and the head arm
To move the upper magnetic head to the disk-shaped recording medium.
In the disk device having a lifter to close or away from the, shifting the pressing position by the spring member in the first direction perpendicular to the moving direction of the head carriage body from a center position of the upper and lower magnetic heads, and the lifter The spring member
From the other direction opposite to the shifting direction to the head arm
A magnetic disk drive wherein the head arm is moved up and down in contact with the magnetic disk drive.