JPH11317036A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a magnetic disk from being damaged due to contact of a magnetic head with the same track of the magnetic disk. SOLUTION: By a control circuit 81 of the magnetic disk device, a voice coil motor 52 is controlled for driving through a VCM driver 82 and the magnetic heads 16, 17 are operated for seeking together with a head carriage 18. A control program is stored in a memory of the control circuit 81 for making the magnetic heads 16, 17 move to the positions different from those at the previous time against the magnetic disk 85 by operating the head carriage in the radial direction when the upper side magnetic head 17 is approached to the magnetic disk 85. Also, the head stop position outputted at random from a random number generator 86 is specified by the control circuit 81. Therefore, the magnetic heads 16, 17 are moved to the stop positions different from those at the previous time and prevented from bringing into contact with the same track of the magnetic disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device, and more particularly, to a disk device configured to perform recording or reproduction by bringing a head close to a disk-shaped recording medium.

[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. The slider is urged in one direction by a coil spring or the like,
When the disc cartridge is inserted, the latch lever is pressed against the end of the disc cartridge and pivots, and the latch by the latch lever is released. As a result, the slider slides in the biasing direction to move the disk holder to the cartridge mounting position. At this time, the disk holder is lowered from the cartridge insertion / ejection position to the cartridge mounting position, thereby chucking the disk in the disk cartridge on the turntable.

[0004] In order to reliably perform such a mounting operation of the disk holder, a spring force for urging the slider is set strong. However, the slider is accelerated by a strong spring force from the initial stage of cartridge insertion to the mounting of the cartridge, and has a substantially constant speed.By the time the slider reaches the sliding completion position, the magnetic head contacts the magnetic disk when the required force is reached. There has been a problem that the impact at the time of contact is so strong that the magnetic film on the surface of the magnetic disk is damaged.

[0005] Therefore, a conventional device is provided with a damper for decelerating the sliding operation of the slider. As this type of damper, there is an oil damper including a gear that meshes with a rack provided on a slider, a rotating body that rotates with the gear, and a container in which grease is filled and the rotating body is stored. When the rotating body provided in the container is rotated by the sliding operation of the slider, the oil damper generates a damping force due to the viscous resistance of the grease filled in the container, and as a result, reduces the sliding operation of the slider. You can do it.

[0006]

However, in the above-mentioned conventional magnetic disk drive, when the disk cartridge is mounted, the head carriage supporting the magnetic head is always at a predetermined position, for example, the magnetic head is positioned at the outermost track "00". ”Because it has returned to the pre-operation position where it can face
When the disk cartridge is inserted into the disk holder and the disk holder is lowered to the mounting position, the magnetic head slides on the outermost track “00” of the magnetic disk.

Therefore, in a conventional magnetic disk drive,
Since the magnetic head slides on the same outermost track "00" when the disk cartridge is mounted, the outermost track "0"
"0" is easily damaged. 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 such a large-capacity magnetic disk device, a levitation force due to an air flow generated as the magnetic disk rotates at a high speed is applied to the magnetic head, so that the magnetic head is slightly damaged so as not to damage the magnetic disk surface. Magnetic recording / reproduction can be performed in a floating state.

However, when a disk cartridge is mounted, the head arm supporting the magnetic head descends vigorously to bring the magnetic head close to the magnetic disk.
Even in a floating magnetic disk device, there is a possibility that the magnetic head contacts the magnetic disk. Also, in this type of magnetic disk device having a large capacity, when the disk cartridge is mounted, the magnetic head has the same outermost track “0”.
Therefore, the outermost track “00” was likely to be damaged due to the sliding contact with “0”.

Therefore, in a magnetic disk drive having a large capacity, since the track pitch of each magnetic disk is small, if the disk surface is damaged, a recording error or a reproduction error will occur, and recording and reproduction cannot be performed. Also, when recording or reproduction is not performed with the disk cartridge mounted, the magnetic disk is rotating at a high speed with the magnetic head close to the same track. The head may slide on the same track to damage the magnetic film of the magnetic disk.

Therefore, an object of the present invention is to provide a disk device which solves the above-mentioned problem.

[0011]

In order to solve the above problems, the present invention has the following features. Claim 1
The invention described above includes a head carriage that supports a head that performs recording or reproduction on a disc-shaped recording medium, a carriage moving mechanism that moves the head carriage in a disc radial direction of the disc-shaped recording medium, and And a head lifting mechanism for bringing the disk-shaped recording medium close to the recording medium.After the recording or reproduction on the disk-shaped recording medium by the head is completed, the carriage moving mechanism is operated to perform a previous operation on the disk-shaped recording medium. And a head moving means for moving the head to a radial position different from the radial position where the head is moved close to the head.

Therefore, according to the first aspect of the present invention, after the recording or reproduction on the disk-shaped recording medium by the head is completed, the carriage moving mechanism is operated to cause the previous head proximity operation to the disk-shaped recording medium. The same position in the radial direction of the disk-shaped recording medium (the same track) to move the head to a radial position different from the radial position
Can be prevented from being damaged by contact with the head.

According to a second aspect of the present invention, in the disk drive according to the first aspect of the present invention, the head moving means moves the head to a position adjacent to a previous head among a plurality of tracks of the disk-shaped recording medium. It is characterized in that one track different from the operation is specified.

Therefore, according to the second aspect of the present invention, since the head designates one of a plurality of tracks on the disk-shaped recording medium different from the previous track, the same track on the disk-shaped recording medium is damaged. Can be prevented. According to a third aspect of the present invention, in the disk drive according to the first aspect, the head moving means randomly specifies a track position to which the head should approach. .

Therefore, according to the third aspect of the present invention, since the track position to which the head should approach is randomly specified, it is possible to prevent the same track on the disk-shaped recording medium from being damaged. According to a fourth aspect of the present invention, in the disk device according to the first aspect, the head moving means specifies a track position adjacent to a previous track as a track position to which the head should approach. It is characterized by the following.

Therefore, according to the fourth aspect of the present invention, since the track position adjacent to the previous track is specified as the track position to which the head should approach, the same track on the disk-shaped recording medium can be prevented from being damaged. . Further, the invention according to claim 5 includes a head carriage that supports a head that performs recording or reproduction on a disk-shaped recording medium, a carriage moving mechanism that moves the head carriage in a disk radial direction of the disk-shaped recording medium,
A head device for moving the head by operating the carriage moving mechanism when the head does not perform recording or reproduction for a predetermined time or more in a disk device having a head elevating mechanism for bringing the head close to the disk-shaped recording medium; It has a moving means.

Therefore, according to the fifth aspect of the present invention, when the head does not perform recording or reproduction for a predetermined time or more, the head is moved by operating the carriage moving mechanism.
The same track on the disk-shaped recording medium can be prevented from being damaged.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an embodiment of the disk drive according to the present invention. FIG. 2 is an exploded perspective view showing a schematic configuration of the disk device. 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 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.

A turntable 15 driven by a disk rotation motor from below the frame 14 so as to protrude above a plane 14a of the frame 14, a magnetic head 16,
17 is 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 main body 19 that supports the lower magnetic head 16 on the top surface of the front end, and a head arm 20 that supports the upper magnetic head 17 on the bottom surface of the front end and is rotatably attached to the carriage main body 19.

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 provided on the main guide shaft 2
1 comprises a circular hole through which the head carriage 18
It is a main bearing for regulating the moving direction, the left and right direction, and the height position. Further, since the bearing portion 18b is a U-shaped bearing to which the guide shaft 24 fits, 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 A and B directions while being guided by the guide shafts 21 and 24 by the driving force from the voice coil motor 52 of the carriage moving mechanism described later. Thus, the magnetic heads 16 and 17 supported by the head carriage 18 can perform magnetic recording / reproduction by sliding in contact with desired tracks of a magnetic disk (not shown) stored in a disk cartridge. .

On the lower surface of the slider 13, a damper mechanism 31 is provided. 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. Then, the lower surface of the slider 13, a shaft 34 for supporting the damper plate 32 of the damper mechanism 31 rotatably, and a hooking portion 13a ₂ is provided for engaging one end of the torsion spring 33. The damper plate 32 has an elongated hole 32e into which a pin 86 fixed to the frame 14 is fitted.

The damper plate 32 is rotatably supported by a shaft 34 projecting below the top plate 13a of the slider 13 as will be described later. By changing the relative position between the pin 86 fixed to the side and the shaft 34 of the slider 13, the operation of the slider 13 is buffered. Accordingly, the damper mechanism 31 of the present embodiment is a mechanical damper mechanism that urges the slider 13 so as to reduce the sliding operation of the slider 13 using a spring force instead of an oil damper.

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.

When the disk cartridge reaches the mounting position together with the disk holder 12, the damper mechanism 31 rotates the damper plate 32 so that the action direction of the torsion spring 33 is reversed and the slider 13 is mounted in the mounting direction (A direction). To hold the disk holder 12 at the mounting position. Next, the configuration of each main part configured as described above will be individually described.

The disk holder 12 includes a top plate 12a and cartridge guide portions 12b and 12c 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 that is in contact with a protruding portion 20a protruding from both sides of the head arm 20 is swingable on the right side of the opening 12d. Installed. 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 elevating mechanism.

The lifter 25 has a shaft 25b projecting from both ends of the 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 disc 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. The latch lever 38 has a lever portion 38 a as a pressed portion pressed by a disk cartridge inserted into the disk holder 12, and
Locking portion 38 that regulates movement of the cartridge in the cartridge mounting direction.
b. The lever 38a rotates in response to insertion or ejection of a disc cartridge, and opens and closes a shutter (not shown) of the disc cartridge.

One end of the coil spring 41 is locked in the locking hole 38e of the latch lever 38, and the other end is
3, the latch lever 38 urges the slider 13 in the locking direction, and the disk holder 12
And the slider 13 is urged to move in the cartridge mounting direction. That is, the coil spring 41 serves both as a slider return spring that biases the slider 13 in the direction A and a latch lever return spring that biases the latch lever 38. Therefore, the number of parts can be reduced as compared with the case where the urging member of the latch lever 38 and the urging member for the slider 13 are separately provided, and the assembling work is simplified by that much, the working efficiency is increased, and the manufacturing cost is reduced. Can be reduced.

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. When the latch lever 38 rotates in this manner, the tip end 38c of the lever portion 38a pushes a shutter (not shown) of the disk cartridge in the opening direction, and the magnetic heads 16 and 17 are opened.
Can slide on the magnetic disk. 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 is a lock member that locks the head carriage 18 to prevent the magnetic heads 16 and 17 from moving during ejection and in a standby state, as described later. 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. ), E and F as in the case of the lifter 25 described above.
It is supported so as to be rotatable in the direction.

The carriage stopper 45 engages with a rack 45b provided on one side of the main body 45a for locking the head carriage 18 and an engagement pin 25d projecting from an end of the lifter 25. V-shaped recess 45c
And a connecting pin 45 projecting upward from the other side of the main body 45a.
d, and a shaft 45e which is a center when swinging. Further, as shown in FIG. 2, a movable rack 56 facing the rack 45b is provided on the right side surface of the head carriage 18. The rack 45b has a length corresponding to a position from the innermost track position to the outermost track position of the disk,
That is, it is formed to extend to a length corresponding to the stroke of the head carriage 18. Therefore, the carriage stopper 45 is rotated in the E direction so that the rack 45 is rotated.
b engages with the movable rack 56 to lock the head carriage 18.

Reference numeral 46 denotes a link mechanism which is connected to the carriage stopper 45, and comprises a first link 46A and a second link 46B which are rotatably connected. FIG. 5A is a plan view illustrating a state where the first link 46A and the second link 46B are connected. FIG. 5B is a longitudinal sectional view for explaining a state where the first link 46A and the second link 46B are connected.

As shown in FIGS. 5A and 5B, the first
Link 46A includes a shaft hole 46A ₁ shaft 76 erected on the frame 14 is formed in a planar diagram L-shape (see FIG. 6) is fitted rotatably supported, which will be described later solenoid The engagement arm 46 engaged with the plunger 49 of 48
And A _2, the engagement arm 46A ₂ and the connecting arm 46A ₃ extending in a direction perpendicular connection shaft 46A ₄ which is connected to the second link 46B provided on the end portion of the connecting arm 46A ₃
And

The connecting arms 46A ₃ are engagement groove is formed in a bifurcated shape extending so as to face the top and bottom of the plunger 49, the engagement pin 49a projecting in the vertical direction of the plunger 49 engages 46A ₆ is provided. Further, the lower end of the connecting shaft 46A _4, pawls 46A ₇ for preventing leakage protrudes radially. Second link 46
B has a _first end at one end of the rod portion 46B1 extending linearly.
A link 46A and a connecting hole 46B ₂ are connected, the fitting hole 46B ₃ to be fitted to the connecting pin 45d of the carriage stopper 45 at one end of the rod portion 46B _1, the fitting hole 46
And a spring engaging hole 46B ₄ provided in the vicinity of B _3. The connecting hole 46B ₂ are claw 4 of the first link 46A
It has a pair of fan-shaped relief portion formed shape on the outer periphery of the circular hole corresponding to the protruding shape of 6A _7.

The link mechanism 46 is connected to the first link 4
The second link 46B is incorporated in the device such that the second link 46B is rotatable in a range of a bent state shown by a broken line from an extended state where the second link 46B is linearly connected to the second link 46B.
As shown in FIG. 6, the link mechanism 46 is urged by the spring force of the torsion spring 47 so that the second link 46B is extended. That is, the torsion spring 47 has one end 47a hooked to the rear end of the frame 14, and the other end 47b connected to the spring engagement hole 46 of the second link 46B.
We are hooked on B _4. Therefore, the link mechanism 46 is held in an extended state by the spring force of the torsion spring 47 and the carriage stopper 45 is moved to the head carriage 1.
8 side.

The other end 47b of the torsion spring 47
Is a curved shape so as to urge the spring hooking hole 46B ₄ of the second link 46B with the stopper 45 side carriage. And the coil part 4 of the torsion spring 47
7c is a cylindrical protruding pin 7 protruding on the frame 14.
7. When energized by a command from a control circuit (not shown), the solenoid 48 is excited to attract the plunger 49 in the C direction. Further, an engagement pin 49 a provided at an end of the plunger 49 is engaged with the first link 46 A of the link mechanism 46. Therefore, when the solenoid 48 is excited and the plunger 49 is sucked in the direction C, the first link 46A of the link mechanism 46 rotates clockwise, that is, in the carriage unlocking direction.

When the solenoid 48 is not excited due to a power failure or the like, the plunger 49 returns in the direction D due to the spring force of the torsion spring 47.
The sixth first link 46A rotates in the counterclockwise direction, that is, in the carriage locking direction. Solenoid 48 of this embodiment
Is set such that the stroke S of the plunger 49 that can be slid is relatively small.

In FIG. 2, reference numeral 50 denotes a holding member.
The guide shaft 2 is fixed to the frame 14.
4. The stopper coupling lever 46, the solenoid 48, and the torsion spring 47 are formed by sheet metal so as to be held from above. A guide shaft pressing member 51 is fixed to the frame 14 in a state where the end of the guide shaft 21 is pressed in a direction C perpendicular to the axial direction.

Reference numeral 52 denotes a voice coil motor,
A magnet (not shown) is disposed on the head 4, and a coil 53 is provided integrally 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 structure of the peripheral portion of the head carriage 18 will be described. FIG. 6 is an enlarged plan view showing a peripheral portion of the head carriage 18 in the eject mode. As shown in FIG. 6, the head arm 20
The head carriage 18 is supported by a support table 57 via a leaf spring 58 so as to be vertically rotatable. Further, the head arm 20 is moved from the torsion spring 60 hooked in a state of being wound around a shaft 59 provided at the rear portion of the support base 57 to A.
It is urged downward by a pressing portion 60a extending in the direction.

Therefore, 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. The lifter 25 includes a V-shaped recess 45 provided at an end of the carriage stopper 45 with an engagement pin 25 d protruding from the end.
As described later, the carriage 45 rotates intermittently in conjunction with the rotation of the stopper 45 for the carriage.

Since the plunger 49 of the solenoid 48 is not attracted by the electromagnetic force, it moves in the direction D. Then, the first link 46A and the second link 46B of the link mechanism 46 engaged with the engagement pin 49a of the plunger 49 are urged by the torsion spring 47 and held in a state of linearly extending. Therefore, the second link 4
6B connects the connecting pin 45d of the carriage stopper 45 to C
Press in the direction. Thereby, the carriage stopper 4
The fifth rack 45b engages with the movable rack 56 of the head carriage 18 to lock the head carriage 18.

At the rear of the frame 14, an eject detection switch 54 for detecting that the slider 13 has slid in the eject direction is provided. 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 disk mounting operation of the magnetic disk device 11 configured as described above will be described.

As shown in FIGS. 1 and 3, when a disk cartridge (not shown) is inserted into the disk holder 12 from the disk insertion opening 26 of the front bezel 27,
The latch lever 38 is pressed to rotate clockwise. The latch portion 38b of the latch lever 38 is
When the coil spring 4 is separated from the hooked portion 13h,
The slider 13 urged by 1 slides in the A direction.

When the latch lever 38 rotates clockwise in this manner, the engagement of the slider 13 is released, and the tip 38c of the lever 38a opens the shutter (not shown) of the disk cartridge. Both sides of the disk holder 12 are supported on the left and right side surfaces of the frame 14 so as to be movable only in the vertical direction. Therefore, when the slider 13 slides in the direction A, the engaging pin 12e of the disk holder 12 is driven along the inclined groove 13d,
The disk holder 12 descends from the cartridge insertion / ejection position to the cartridge mounting position.

Further, in the ejection mode, the end of the slider 13 extending in the direction B contacts the ejection detection switch 54 to close the ejection detection switch 54. Therefore, the ejection detection switch 54 outputs an ejection detection signal to a control circuit (not shown).
As a result, the energization of the solenoid 48 is stopped and the solenoid 48 is demagnetized, and the plunger 49 is displaced in the direction D.

In the eject mode, since the solenoid 48 is not excited, the first link 46A and the second link 46B of the link mechanism 46 are linearly extended by the spring force Fa of the torsion spring 47. Become. Therefore, the carriage stopper 45 is pressed toward the head carriage 18 to engage the rack 45b with the movable rack 56 on the head carriage 18 side.

The spring force Fa of the torsion spring 47
Acts as a pressing force Fb to press the projecting pins 45d to be engaged with the engaging hole 46B ₃ of the stopper coupling lever 46 in the C direction. Since the head carriage 18 is driven in the directions A and B by the voice coil motor 52, when there is no driving force from the voice coil motor 52 at the time of, for example, a power outage, the head carriage 18 is not restrained at all and moves without permission. It's easy to do. However, in the eject mode, the rack 45b of the carriage stopper 45 is
The head carriage 18 is engaged with the movable rack 56 on the
Is locked, it is possible to prevent the head carriage 18 from moving without permission.

Even if a power failure occurs during another operation mode, the driving force from the voice coil motor 52 is lost and the solenoid 48 is demagnetized in the same manner as described above. The head carriage 18 can be prevented from moving on its own. FIG. 7 is a block diagram for explaining a control system of the turntable 15 and the head carriage 18.

As shown in FIG. 7, the control circuit 81
The drive of the voice coil motor 52 is controlled via the VCM driver 82, and the magnetic head 1 is
6, 17 can be made to perform a seek operation. When the disk cartridge is mounted, the control circuit 81 controls the disk motor 8 via the spindle motor driver 83.
4 and drives the turntable 15 to rotate.

When the upper magnetic head 17 approaches the magnetic disk (recording medium) 85 as will be described later, the head carriage 18 is moved in the disk radial direction to store the magnetic disk 85 in the memory of the control circuit 81. A control program (head moving means) for moving the magnetic heads 16 and 17 to a position different from the previous time is stored. The control circuit 81 includes a database of a random number table for randomly designating the head stop position, or the magnetic head 1.
A random number generator 86 in which a randomizer that outputs the stop positions of 6, 17 at random is stored is connected.

FIG. 8 is an enlarged plan view showing a peripheral portion of the head carriage 18 in a standby state in the recording / reproducing mode. As shown in FIG. 8, when in a standby state such as a standby state or a sleep state in the recording / reproduction mode,
Since the seek operation of the head carriage 18 is not performed, the solenoid 48 is demagnetized in that case. Thus, the first link 46A and the second link 46B of the link mechanism 46 are linearly extended by the spring force Fa of the torsion spring 47, as in the eject mode shown in FIG. Therefore, the rack 45b of the carriage stopper 45 meshes with the movable rack 56 on the carriage 18 side.

Thus, when the recording / reproducing mode is in the standby state, the head carriage 18 is locked in a state in which the head carriage 18 cannot move in the A and B directions. FIG. 9 is an enlarged plan view showing the periphery of the head carriage 18 when a seek operation is performed in the recording / reproducing mode. As shown in FIG. 9, in the recording / reproducing mode, when the disc cartridge inserted into the disc holder 12 moves to the recording / reproducing position,
When the disk sensor (not shown) is turned on and the rotation speed of the disk motor 84 for driving the turntable 15 reaches a specified high-speed rotation speed, the solenoid 48 is energized.

Therefore, in the recording / reproducing mode, the solenoid 4
8 is excited to suck the plunger 49 in the C direction. At this time, since the first link 46A of the link mechanism 46 is rotated clockwise, the suction force of the solenoid 48 is increased. Thus, the first link 46A and the second link 46B of the link mechanism 46 connected to the plunger 49
Is displaced into a bent state to separate the rack 45b of the carriage stopper 45 from the movable rack 56 of the head carriage 18. As a result, the lock on the head carriage 18 by the carriage stopper 45 is released.

Accordingly, the head carriage 18 seeks in the disk radial direction (A and B directions) by the driving force of the voice coil motor 52, and
7 can face a desired track. Plunger 4 that is attracted in the C direction by excitation of solenoid 48
9 is engaged with the engaging arm 46A ₂ of the first link 46A that is rotatably supported by a shaft 76 on the frame 14. Therefore, the suction force Fd of the solenoid 48 is
The torque is converted to a torque Ff for rotating the first link 46A, and becomes a force Fe for pressing the connecting pin 45d in the D direction.
The suction force Fd of the solenoid 48 acts as a pressing force Fg for pressing the engaging pin 25d of the lifter 25 in the D direction by the V-shaped concave portion 45c of the carriage stopper 45.

Therefore, even if the suction force Fd of the solenoid 48 is small, it is enlarged by the stopper coupling lever 46 and transmitted to the carriage stopper 45 and the lifter 25, so that a sufficient driving force can be obtained even if the solenoid 48 is small. . Accordingly, the power consumption of the solenoid 48 can be reduced, and the installation space for the solenoid 48 can be reduced to cope with the downsizing of the device.

Next, the operation of the head arm 20 in conjunction with the operations of the carriage stopper 45, the link mechanism 46, the torsion spring 47, and the solenoid 48 will be described. FIG. 10 is a front view for explaining the operation of the carriage stopper 45 with respect to the head carriage 18.
FIG. 10A shows an operation state in the ejection mode, in which the stopper coupling lever 46 is pressed in the C direction by the spring force of the torsion spring 47. Therefore, the carriage stopper 45 is connected to the torsion spring 47.
The rack 45b is rotated in the direction E by the spring force of the above, and the rack 45b meshes with the movable rack 56 on the head carriage 18 side. Therefore, the head carriage 18 is mounted on the carriage stopper 4.
Locked to 5.

FIG. 10B shows an operation state in the standby mode. In the standby mode, the stopper coupling lever 46 is pressed in the C direction by the spring force of the torsion spring 47 as in the eject mode. Therefore, the carriage stopper 45 rotates in the direction E by the spring force of the torsion spring 47, and the rack 45b meshes with the movable rack 56 on the head carriage 18 side to lock the head carriage 18.

FIG. 10C shows an operation state in the recording / reproducing mode. In this recording / reproducing mode, the solenoid 48 is excited as described above, and the second link 46
B is driven in the D direction. Therefore, the carriage stopper 45 is rotated in the F direction by the driving force of the solenoid 48, and the rack 45b is separated from the movable rack 56 on the head carriage 18 side to release the lock of the head carriage 18. As a result, the head carriage 18 becomes A,
The seek operation can be performed in the B direction.

FIG. 11 is a front view for explaining the operation of the carriage stopper 45 and the lifter 25 with respect to the head arm 20. FIG. 11A shows an operation state in the ejection mode. The carriage stopper 45 is rotated in the E direction by the spring force of the torsion spring 47, and the rack 45b is moved toward the head carriage 18 side. It engages with the rack 56. Since the disk holder 12 has been raised to the disk ejection / insertion position, the lifter 25 has also been raised.

An adjusting bolt 74 for adjusting the height of the lifter 25 is screwed into the holding member 50. The lower end of the adjustment bolt 74 contacts an abutting portion 75 extending from the end of the lifter 25. Therefore, the adjustment bolt 74
The lift amount of the lifter 25 can be adjusted by changing the amount of screwing into the holding member 50.

In the process of raising the disk holder 12 to the disk ejection / insertion position, the lifter 25
The abutting part 75 provided integrally with the abutment contacts the lower end of the adjustment bolt 74. The lifter 25 is supported on the upper surface of the disk holder 12 so as to swing in the E and F directions about the shaft 25b. Therefore, the abutting portion 75 extending rightward of the lifter 25 with the upward movement of the disk holder 12 abuts on the lower end portion of the adjustment bolt 74, whereby the lifter 2 is lifted.
5 rotates in the F direction.

A protrusion 20 a projecting laterally from the head arm 20 is locked to a lock 25 c provided on the left side of the lifter 25. Therefore, the lifter 25 rotates in the F direction together with the upward movement of the disk holder 12 to lift the protrusion 20a of the head arm 20 upward. As a result, the head arm 20 is connected to the upper magnetic head 17.
Is held at the upward movement position separated from the lower magnetic head 16.

At this time, the engagement pin 25 of the lifter 25
d is separated from the V-shaped concave portion 45c of the carriage stopper 45. FIG. 11B shows an operation state in the standby mode. In the standby mode, the head arm 20 temporarily stops at an intermediate position between the disk eject / insert position and the disk mounting position. That is, the engaging pin 25 d protruding in the direction B from the end of the lifter 25 enters the V-shaped concave portion 45 c of the carriage stopper 45 with the lowering operation of the disk holder 12. Then, the engagement pin 25d of the lifter 25 is inserted into the V-shaped concave portion 45c of the carriage stopper 45 and contacts the inclined portion of the V-shaped concave portion 45c.

Thus, the lifter 25 is stopped at an intermediate position from the disk eject / insert position to the disk mounting position. Therefore, the turning operation of the head arm 20 linked to the lifter 25 is temporarily stopped. In the standby mode, since the head arm 20 is stopped at an intermediate position before the head arm 20 descends to the disk mounting position, the magnetic head 17 supported by the distal end of the head arm 20 is supported by the distal end of the carriage body 19. Magnetic head 16
And a predetermined distance S therebetween. Therefore, the upper magnetic head 17 is located above a magnetic disk (not shown).

The lower magnetic head 16 is in non-contact with the magnetic disk until the disk holder 12 is lowered to the disk mounting position. FIG.
(C) shows the operation state in the recording / reproducing mode. In the recording / reproducing mode, as described above, the solenoid 48 is excited and the stopper coupling lever 46 is driven in the D direction, so that the carriage stopper 45 is rotated in the F direction by the driving force of the solenoid 48, Rack 45
b is separated from the movable rack 56 on the head carriage 18 side. As a result, the lock of the head carriage 18 is released.

The carriage stopper 45 rotates in the F direction, and the V-shaped recess 4
5c presses the engagement pin 25d of the lifter 25 in the E direction. Therefore, the lifter 25 rotates in the E direction in conjunction with the rotation of the carriage stopper 45 in the F direction, and the lifter 2
The locking portion 25c of No. 5 descends. Thereby, the head arm 20 also descends. Therefore, the magnetic head 17 supported by the head arm 20 stops at a position close to a magnetic disk (not shown) in the standby mode, and then is decelerated by the stepwise lowering operation of the head arm 20 to the magnetic disk. Be close.

As described above, there is a case where the magnetic head 17 temporarily comes into contact with the surface of the magnetic disk rotating at a high speed as the head arm 20 descends, but the magnetic head 17 slides on the magnetic disk by intermittent operation. Since the magnetic disk is moved to the recording / reproducing position, the impact on the magnetic disk is reduced, and the magnetic film formed on the surface of the magnetic disk can be prevented from being damaged.

Note that the ejecting operation is the reverse of the above-described mounting operation, and therefore the description thereof is omitted. FIG. 12 is an experimental result showing a change in the height direction of the magnetic head 17 related to the disk mounting operation. Referring to FIG.
Shows the characteristics of the conventional device without a damper. Also the graph
II shows the characteristics of the conventional device having a damper mechanism for reducing the operation speed of the slider by the viscous damper. And
Graph III shows the characteristics when the head arm 20 descends stepwise as in the present invention.

By comparing the graphs I, II, and III, it can be seen that the following differences exist. First, in the case of the graph I without a damper, the damper for buffering the mounting operation of the disk cartridge is not provided, so that the disk holder and the head arm drop rapidly with the sliding operation of the slider. Therefore, in a magnetic disk device without a damper, the upper magnetic head supported by the head arm descends vigorously and presses the magnetic disk against the lower magnetic head by the mounting operation of the disk cartridge.

As a result, due to the reaction force when the upper magnetic head collides with the lower magnetic head, the upper magnetic head bounces and repeatedly collides with the magnetic disk. As a result, the magnetic film formed on the surface of the magnetic disk is damaged. In the case of graph II with a damper, the operating speed of the magnetic head is reduced. However, since the disk holder and the head arm drop from the disk eject / insert position to the disk mounting position at once, the potential energy of the head arm is reduced. , The deceleration by the damper is not enough. For this reason, the mounting operation of the disk cartridge can be buffered by the damper, but the magnetic head comes into contact with the magnetic disk while the operating speed when contacting the magnetic disk is accelerated. Therefore, in a magnetic disk device with a damper, the descent speed of the magnetic head is reduced more than in the case without the damper, but the deceleration of the head arm is not sufficient, so that the upper magnetic head collides with the lower magnetic head. The collision with the magnetic disk is repeated due to the bound. As a result, there is a high possibility that the magnetic film formed on the surface of the magnetic disk will be damaged.

On the other hand, when the operating speed of the slider 13 is reduced by the mechanical damper mechanism 31 and the descent of the head arm 20 is performed intermittently as in the present invention, as shown in the graph III in FIG. It can be seen that the operation speed of the magnetic head 17 in the height direction changes stepwise and is the slowest. In the case of the magnetic disk drive 11 of the present invention, the disk holder 12 and the head arm 2
As described with reference to FIGS. 11A to 11C, the mounting operation of the lifter 25 and the head arm 20 between the disk eject / insert position and the disk mounting position is performed in the standby mode. Stop temporarily at the intermediate position.

That is, in this standby mode, the magnetic head 17 supported by the tip of the head arm 20 is stopped at an intermediate position close to the magnetic disk. Because it is descending, it is in contact with the magnetic disk. However, since the magnetic disk is in contact with the magnetic head 16 only by its own weight, it is not damaged. When the rotation of the disk motor 84 for driving the turntable 15 reaches the specified number of revolutions during the standby mode, the solenoid 48 is excited to unlock the head carriage 18 and simultaneously lift the lifter 25.
Then, the lowering operation of the head arm 20 is restarted.

When the head arm 20 rotates downward with the lowering operation of the lifter 25, the magnetic disk pressed by the upper magnetic head 17 instantaneously moves the magnetic head 1.
6. However, since the acceleration of the magnetic head 17 from the intermediate position stopped in the standby mode to the contact with the magnetic disk is small, the impact on the magnetic head 16 is reduced.

Therefore, since the magnetic head 17 comes into contact with the magnetic disk 17 at a slow operating speed from a position close to the magnetic disk, the magnetic head 17 does not bounce when it comes into contact with the magnetic disk, so that damage to the magnetic film is reliably prevented. Further, as can be seen from Graph III, since the descent operation of the head arm 20 is temporarily stopped in the standby mode, the speed at which the magnetic head 17 contacts the magnetic disk is sufficiently reduced, and during this standby state, Since the solenoid 48 is excited to lower the magnetic head 17 after electrically detecting that the rotation speed of the disk motor 84 for rotating the turntable 15 has increased to the specified rotation speed, the magnetic head 17 is When it comes into contact with the magnetic disk, it receives buoyancy due to the airflow on the surface of the disk, so that the impact at the time of contact with the magnetic disk is reduced.

The magnetic disk drive 1 operating as described above
1, the disk cartridge is in the disk holder 1
The processing executed by the control circuit 81 when the control circuit 81 is inserted into the control unit 2 will be described. When the eject operation is performed, the control circuit 81 executes a control process shown in FIG. That is,
Step S1 in FIG. 13 (hereinafter, “step” is omitted)
When the disc cartridge is inserted into the disc holder 12, the process proceeds to S2, in which the disc motor 84 is driven to rotate.

In the next S3, the solenoid 48 is energized to unlock the head carriage 18. That is,
When the solenoid 48 is excited, the link mechanism 4
6 is bent, and the carriage stopper 45 is separated from the head carriage 18. As described above, at the same time when the lock of the head carriage 18 is released, the lowering operation of the lifter 25 and the head arm 20 is performed in a stepwise manner, and the upper magnetic head 17 can approach the magnetic disk 85 from the standby position for recording and reproduction. Move to position.

Then, in S4, recording or reproduction is enabled, and information is written on the magnetic disk 85 or information recorded on the magnetic disk 85 is read. In the next S5, the head carriage 18 is driven by the voice coil motor 52, and the magnetic heads 16 and 17 are driven.
The seek operation. Subsequently, in S6, it is checked whether or not there is a stop command.

If there is no stop command in S6, the flow returns to S4, and the above-described recording or reproducing operation is performed.
However, if there is a stop command in S6, it is determined that the current recording or reproducing process has been completed, and the process proceeds to S7, where the magnetic heads 16 and 17 for the magnetic disk 85 are read.
Is selected at random. At this time, the head stop position (track number) corresponding to the numerical value randomly output from the random number generator 86 is selected.

Subsequently, in S8, the voice coil motor 52
, The head carriage 18 is driven in the radial direction of the disk, and the magnetic heads 16 and 17 perform seek operations. Then, in the next S9, it is determined whether or not the magnetic heads 16, 17 have arrived at the selected head stop position (track number). If the magnetic heads 16 and 17 have not arrived at the selected head stop position (track number) in S9, the process returns to S8 and the seek operation of the magnetic heads 16 and 17 is continued. However, in S9, the magnetic heads 16, 1
When 7 arrives at the selected head stop position (track number), the process proceeds to S10, in which the power supply to the voice coil motor 52 is stopped, and the seek operation of the magnetic heads 16 and 17 is stopped.

In the next step S11, the power supply to the solenoid 48 is stopped and the head carriage 18 is locked. That is, when the solenoid 48 is demagnetized, the link mechanism 46 extends linearly, and the rack 45 b of the carriage stopper 45 is moved to the movable rack 56 of the head carriage 18.
Mesh with. Then, at the same time as the head carriage 18 is locked, the lifter 25 and the head arm 20 move upward, and the upper magnetic head 17 is separated from the magnetic disk 85.

In the next step S12, it is checked whether there is a recording or reproduction command. In S12, if there is a recording or reproduction command, the process returns to S3, and the processes after S3 are executed again. However, if there is no recording or reproduction command in S12, the process proceeds to S13, and it is checked whether the disc cartridge has been ejected.

If the disc cartridge is not ejected in S13, the process returns to S12. However, when the disc cartridge is ejected in S13, the disc motor 84 is stopped in S14, and the current process is terminated. As described above, in the magnetic disk device 11, when the recording or reproduction is completed and the stop command is output, the head stop position (track number) in the disk radial direction is changed, so that the magnetic heads 16 and 17 each time. It will be in close proximity to a different track. Therefore, after the recording or reproduction by the magnetic heads 16 and 17 is completed, the head carriage 18 is sought to move the magnetic disk 85 to a position in the disk radial direction (track position) different from the proximity operation to the disk by the previous disk cartridge mounting operation. ) Magnetic head 1
Since the tracks 6 and 17 are moved, the same track on the magnetic disk 85 can be prevented from being damaged.

FIG. 14 is a flowchart of a modified example of the process of S7. In FIG. 14, in S21, the number of stops n of the magnetic disk device 11 stored in the memory is read. In the next S22, it is checked whether or not the track n corresponding to the number of stops n is the innermost track. This S2
If the track n is the innermost track in 2, the process proceeds to S23, where the outermost track “00” is designated.

However, in this S22, the track n
Is not the innermost track, the process proceeds to S24, where track n + 1 is designated. Thus, the magnetic disk drive 1
By specifying the number of tracks according to the number of stops n of 1, the magnetic heads 16 and
Since the track 17 is sought, the magnetic heads 16 and 17 face each other in close proximity to different tracks, and the same track on the magnetic disk 85 can be prevented from being uniformly contacted with the entire surface of the magnetic disk 85 and damaged.

FIG. 15 is a flowchart showing a first modification of the process executed by the control circuit 81. The control circuit 81
When the head carriage 18 stops, an interrupt process shown in FIG. 15 is executed. That is, in S41 of FIG. 15, the head carriage 18 stops and the magnetic heads 16 and
When the seek operation of No. 17 is stopped, the process proceeds to S42, and the timer is set to ON. In the next S43, it is checked whether recording or reproduction is started. This S4
In 3, when recording or reproduction is started, the current processing is ended and the processing shifts to recording or reproduction processing.

However, if the recording or reproduction is not started in S43 and the head carriage 18 remains stopped, the process proceeds to S44, where the count time counted by the timer is set to the preset time T. Check if it has passed. Until the count time of the timer reaches the set time T, the above-mentioned S43 and S4
Step 4 is repeated.

In S44, when the count time of the timer has exceeded the set time T, the flow proceeds to S45, and the positions of the magnetic heads 16 and 17 with respect to the magnetic disk 85 are selected at random. At this time, a head stop position (track number) in the disk radial direction corresponding to the numerical value output at random from the random number generator 86 or the track position designated by the above-described processing of FIG. 14 is selected.

Then, in S46 to S48, the aforementioned S
The same processing as in steps 8 to S10 is executed. Therefore, in the magnetic disk device 11, when the standby state of the recording / reproducing mode (see FIGS. 8, 10B and 11B) continues for a predetermined time (set time T) or more, the head By changing the stop position (track number), the magnetic heads 16 and 17 each face a different track each time, so that the same track on the magnetic disk 85 can be prevented from being damaged.

In the above embodiment, the magnetic disk device has been described as an example. However, the present invention is not limited to this. For example, a card-shaped recording medium such as an optical disk device, a magneto-optical disk device, or a memory card may be mounted. Needless to say, the present invention can be applied to a recording / reproducing apparatus and the like. 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.

In the case of a magnetic disk drive in which the head carriage 18 is not locked when the magnetic head 17 rises and separates from the disk surface, the magnetic head 17 may be randomly or erroneously set before the magnetic head 17 descends to the disk surface. A configuration may be employed in which the magnetic heads 16 and 17 perform a seek operation to a track position different from the previous time.

[0097]

As described above, according to the first aspect of the present invention, after the recording or reproduction on the disk-shaped recording medium by the head is completed, the carriage moving mechanism is operated to perform the previous operation on the disk-shaped recording medium. Since the head is moved to a radial position different from the radial position where the head is moved close to the head, the same radial position (the same track) of the disk-shaped recording medium can be prevented from being damaged by contact with the head. Therefore, the life of the disk-shaped recording medium can be extended, and the reliability of recording and reproduction on the disk-shaped recording medium can be improved.

According to the second aspect of the present invention, since the head designates one of a plurality of tracks on the disk-shaped recording medium different from the previous track, the same track on the disk-shaped recording medium can be damaged. Can be prevented. Therefore, the life of the disk-shaped recording medium can be extended, and the reliability of recording and reproduction on the disk-shaped recording medium can be improved.

According to the third aspect of the present invention, since the track position to which the head should approach is randomly specified, it is possible to prevent the same track on the disk-shaped recording medium from being damaged. Therefore, the life of the disk-shaped recording medium can be extended, and the reliability of recording and reproduction on the disk-shaped recording medium can be improved. According to the fourth aspect of the present invention, since the track position adjacent to the previous track is designated as the track position to which the head should approach, it is possible to prevent the same track on the disk-shaped recording medium from being damaged. Therefore, the life of the disk-shaped recording medium can be extended, and the reliability of recording and reproduction on the disk-shaped recording medium can be improved.

According to the fifth aspect of the present invention, when the head does not record or reproduce data for a predetermined time or more, the head is moved by operating the carriage moving mechanism, so that the same track on the disk-shaped recording medium is damaged. Can be prevented. Therefore, the life of the disk-shaped recording medium can be extended, and the reliability of recording and reproduction on the disk-shaped recording medium can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a 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 a diagram for explaining a procedure for connecting a first link and a second link.

FIG. 6 is an enlarged plan view showing a peripheral portion of a head carriage in an ejection mode.

FIG. 7 is a block diagram for explaining a control system of a turntable and a head carriage.

FIG. 8 is an enlarged plan view showing a peripheral portion of a head carriage in a recording / reproducing mode.

FIG. 9 is an enlarged plan view showing a peripheral portion of a head carriage when a seek operation is performed in a recording / reproducing mode.

FIG. 10 is a front view for explaining an operation of a carriage stopper with respect to a head carriage.

FIG. 11 is a front view for explaining operations of a carriage stopper and a lifter with respect to a head arm.

FIG. 12 is an experimental result showing a change in a height direction of a magnetic head related to a disk mounting operation.

FIG. 13 is a flowchart illustrating a process executed by a control circuit when a disk cartridge is inserted into a disk holder.

FIG. 14 is a flowchart of a modification of the process of S7.

FIG. 15 is a flowchart illustrating a modification of the process executed by the control circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Disk device 12 Holder 13 Slider 14 Frame 16 and 17 Magnetic head 18 Head carriage 21 and 24 Guide shaft 25 Lifter 25d Engagement pin 31 Damper mechanism 33 Torsion spring 36 Latch mechanism 38 Latch lever 45 Carriage stopper 45b Rack 45c V-shape Recess 46 link mechanism 46A first link 46B second link 47 torsion spring 48 solenoid 49 plunger 50 holding member 51 guide shaft pressing member 52 voice coil motor 56 movable rack 81 control circuit 84 disk motor 85 magnetic disk 86 random number generator

Claims (5)

[Claims] A head carriage that supports a head that performs recording or reproduction on a disk-shaped recording medium; a carriage moving mechanism that moves the head carriage in a disk radial direction of the disk-shaped recording medium; And a head lifting mechanism for bringing the disk-shaped recording medium close to the recording medium. After the recording or reproduction on the disk-shaped recording medium by the head is completed, the carriage moving mechanism is operated to perform a previous operation on the disk-shaped recording medium. And a head moving means for moving the head to a radial position different from the radial position at which the head was moved close to the disk device. 2. The disk drive according to claim 1, wherein the head moving unit designates the head as one of a plurality of tracks of the disk-shaped recording medium, the track being different from a previous head proximity operation. A disk device characterized by the above-mentioned. 3. The disk drive according to claim 1, wherein said head moving means randomly specifies a track position to which said head should approach. 4. The disk drive according to claim 1, wherein said head moving means specifies a track position adjacent to a previous track as a track position to which said head should approach. . 5. A head carriage for supporting a head for recording or reproducing data on or from a disk-shaped recording medium; a carriage moving mechanism for moving the head carriage in a disk radial direction of the disk-shaped recording medium; A head lifting mechanism for moving the head closer to a recording medium; anda head moving means for operating the carriage moving mechanism to move the head when the head does not perform recording or reproduction for a predetermined time or more. Characteristic disk device.