JPH10188499A - Magnetic disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk driving device that can prevent effects of a locking magnet at the time of operation while maintaining a strong locking power. SOLUTION: The carriage lock mechanism 60, which locks the carriage assembly at the point of suspension is composed from a locking magnet 62 fixed to the lower yoke 50 through a bracket 65 and a magnetic member 63 fixed to the carriage assembly. To the locking magnet, a magnetic capsule 66 and a magnetic path forming member 64 having freely movable magnetic fluid 68 filled in the capsule, are attached. When the carriage assembly moves to the position of suspension, the magnetic path forming member 64 forms a closed magnetic path jointly with the locking magnetic and the magnetic member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and more particularly to a disk drive having a magnetic attraction type locking mechanism for locking a magnetic head at a predetermined position.

[0002]

2. Description of the Related Art For example, in a hard disk drive (hereinafter, referred to as an HDD) using a CSS system (contact start / stop system), a data zone of a magnetic disk is not damaged when the HDD starts or stops. To prevent this, a CSS zone, which is an area unrelated to the data zone, is provided at the innermost circumference of the magnetic disk. And when the power is off (when the disk is stopped)
The magnetic head comes into contact with the magnetic disk in the CSS zone and stops. At the start of the HDD, the power is turned on to increase the rotational speed of the disk, so that the magnetic head floats from the magnetic disk and is moved to the outer peripheral direction of the disk, that is, the data zone by a voice coil motor (hereinafter referred to as VCM).

In the power-off state, there is a possibility that the magnetic head moves on the surface of the magnetic disk due to some bounce, for example, vibration and damages the surface of the magnetic disk. Therefore, a lock mechanism for locking the magnetic head at a predetermined position, that is, a CSS zone is required.

[0004] As this kind of lock mechanism, a lock mechanism utilizing the magnetic force of a magnet is known. This is, for example, V
When the magnetic head is in the CSS zone using the CM magnet, the carriage supporting the magnetic head is locked by the magnetic force of the magnet.

In general, a carriage is rotatably provided around a support shaft, and a magnetic head is attached to a leading end of the carriage and moves in a radial direction on a magnetic disk according to the rotation of the carriage. VCM that rotates the carriage
Has an upper and lower yoke facing each other at a predetermined interval, and a magnet is fixed to one of the yokes.
The voice coil is fixed to the carriage and located between the upper and lower yokes.

The lock mechanism includes a lock magnet provided upright on the yoke, a shock absorbing member attached around the lock magnet, and a lock pin provided on the carriage side and made of a magnetic material. When the magnetic disk device stops and the magnetic head moves over the CSS zone,
A lock pin provided on the carriage is magnetically attracted by a lock magnet. As a result, the rotation of the carriage is restricted, and the magnetic head is locked on the CSS zone.

When the magnetic disk drive is restarted, a current is supplied to the VCM to generate a thrust larger than the lock force of the lock mechanism, thereby rotating the carriage to release the lock and release the magnetic head by the CSS.
Move out of the zone.

[0008]

However, according to the magnetic disk drive having the lock mechanism having the above-described structure, in the locked state, the lock pin is attracted to the locking magnet via the shock absorbing member. Constitutes an open magnetic circuit. Therefore, the magnetic attraction force is weak, and it is difficult to obtain a strong locking force.

In the case where a magnet having a large magnetic force is used as a locking magnet to increase the locking force, when the magnetic head is positioned on the data zone near the CSS zone, the lock pin is moved from the locking magnet. It is affected by the magnetic force and adversely affects the track positioning of the magnetic head.

An object of the present invention is to provide a magnetic disk drive capable of preventing the effect of a locking magnet during operation while maintaining a strong locking force.

[0011]

To achieve the above object, a magnetic disk drive according to a first aspect of the present invention comprises a case accommodating a magnetic disk, and a carriage assembly movably provided in the case. And seeks on the magnetic disk according to the movement of the carriage assembly, supported by the carriage assembly,
A head unit for performing information processing on the magnetic disk, and a yoke and a drive magnet provided in the case, for driving the carriage assembly to move the head unit to an arbitrary position on the magnetic disk And a carriage locking means for locking the carriage assembly to the stop position by magnetic force when the carriage assembly moves to a stop position where the head means is located in a predetermined area on the magnetic disk.

The carriage locking means includes a locking magnet attached to one of the yoke and the carriage assembly, a magnetic member attached to the other of the yoke and the carriage assembly, the locking magnet and the magnetic member. A magnetic path forming member having a movable magnetic body that forms a closed magnetic path in cooperation with the lock magnet and the magnetic member when the carriage assembly is moved to a stop position. The magnetic member is attracted by the magnetic force of the locking magnet to lock the carriage assembly at the stop position.

According to a second aspect of the present invention, there is provided a magnetic disk drive, comprising: a case accommodating a magnetic disk; a carriage assembly movably provided in the case; and a carriage assembly supported by the carriage assembly. A head means for seeking information on the magnetic disk in accordance with the movement of the magnetic disk and performing information processing on the magnetic disk; and a yoke and a driving magnet provided in the case, and moving the carriage assembly to form the head means. Drive means for moving the carriage assembly to an arbitrary position on the magnetic disk, and a stop position for stopping the carriage assembly by magnetic force when the head assembly moves to a stop position located in a predetermined area on the magnetic disk. Carriage locking means for locking the That. The carriage locking means includes a locking magnet attached to one of the yoke and the carriage assembly, a magnetic member attached to the other of the yoke and the carriage assembly, and one of the locking magnet and the magnetic member. A hollow capsule having elasticity attached to one side and having contact with the other of the locking magnet and the magnetic member when the carriage assembly moves to the stop position,
A magnetic body movably accommodated in the capsule and forming a closed magnetic path in cooperation with the lock magnet and the magnetic member when the carriage assembly moves to a stop position,
Wherein the magnetic member is attracted by the magnetic force of the locking magnet to lock the carriage assembly at the stop position.

According to the magnetic disk drive configured as described above, when the carriage assembly moves to the stop position, a closed magnetic path through which magnetic flux flows is formed by the locking magnet of the carriage locking means, the magnetic member, and the magnetic path forming member. Is done. Since the closed magnetic path is formed of a magnetic material, the magnetic flux from the locking magnet can easily flow, and a large locking force can be obtained.

Further, since the magnetic body of the magnetic path forming member is movably provided, when the carriage assembly moves from the lock position to separate the locking magnet and the magnetic member, the magnetic member is separated from the magnetic member. Go to As a result, the locking force of the carriage locking means rapidly decreases.

Further, when the carriage assembly runs away,
The magnetic material of the magnetic path forming member moves against the locking magnet or the magnetic member, and absorbs impact energy due to collision between the magnetic member and the locking magnet. Thereby, the shock absorbing performance of the carriage locking means is improved.

According to the magnetic disk drive of the present invention, the carriage locking means includes a locking magnet attached to one of the yoke and the carriage assembly and a locking magnet attached to the other of the yoke and the carriage assembly. When the carriage assembly is moved to a stop position, the magnetic member is attached to one of the locking magnet and the magnetic member, and is formed of a magnetic material. A magnetic path forming member that moves to a contacting lock position, forms a closed magnetic path in cooperation with the lock magnet and the magnetic member, and moves to a retracted position separated from the lock position when the carriage assembly moves from the stop position. And the magnetic force generated by the locking magnet. By suction wood and the carriage assembly is characterized in that locking in the stop position.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a magnetic disk drive of the present invention is applied to a hard disk drive (hereinafter referred to as an HDD) will be described in detail with reference to the drawings. As shown in FIG. 1 and FIG.
Has a rectangular box-shaped case 10 with an open upper surface, and a top cover 12 that is screwed to the case 10 with a plurality of screws 11 to close the upper end opening of the case.

In the case 10, a magnetic disk 14 as a magnetic recording medium and a spindle motor 16 for supporting and rotating the magnetic disk are provided. The magnetic disk 14 is, for example, 65 mm (2.5 inches) in diameter.
And has a magnetic recording layer on the upper and lower surfaces. The magnetic disk 14 has a CSS zone 14a located at the innermost periphery thereof and a data zone 14b located outside the CSS zone and in which information is recorded.

Further, in the case 10, the magnetic disk 1
A plurality of magnetic heads for recording and reproducing information with respect to the magnetic disk 14, a carriage assembly 18 movably supporting these magnetic heads with respect to the magnetic disk 14, and a voice coil as driving means for rotating and positioning the carriage assembly. Motor (hereinafter referred to as VCM) 2
0, a substrate unit 22 having a preamplifier and the like is housed.

A printed circuit board (not shown) for controlling the operation of the spindle motor 16, the voice coil motor 20, and the magnetic head is screwed to the outer surface of the case 10 via the board unit 20, and is connected to the bottom wall of the case. It is located opposite.

As shown in FIGS. 1 and 2, the carriage assembly 18 includes a bearing assembly 28 fixed on the bottom wall of the case 10 and a pair of arms 34 extending radially from the bearing assembly. A support frame 38 extending from the bearing assembly in a direction opposite to the arms. The pair of arms 34 face each other in parallel at a predetermined interval,
It is located on both sides of the magnetic disk 14. Further, a voice coil 40 constituting a part of the VCM 20 is attached to the support frame 38.

A magnetic head assembly 42 is supported at the extending end of each arm 34. This magnetic head assembly 42
Is an elongated suspension 4 formed by a leaf spring.
4 and a magnetic head 46 as head means fixed to the suspension. Suspension 44
Has its base end fixed to the tip of the arm 34 by spot welding or bonding, and extends from the arm.

With the carriage assembly 18 constructed as described above incorporated in the case 10, the magnetic disk 12 is located between the arms 34, and the magnetic head 46 of the magnetic head assembly 42 attached to the arm 34.
Are in contact with the upper and lower surfaces of the magnetic disk 12, respectively, and sandwich the magnetic disk 12 from both sides. A predetermined head load is applied to each magnetic head 46 by the spring force of the suspension 44.

The VCM 20 has a substantially fan-shaped lower yoke 50 fixed to the bottom wall of the case 10, and a substantially fan-shaped upper part which is screwed on a support 51 erected on the lower yoke and faces a predetermined distance away from each other. It has a yoke 52 and permanent magnets 54 (only one is shown) fixed to the inner surfaces of the lower and upper yokes, respectively. The voice coil 40 provided on the carriage assembly 18 is located between the pair of permanent magnets 54 and is movable between them.

When the voice coil 40 is energized,
Due to the interaction between the magnetic flux generated from the coil and the magnetic flux from the permanent magnet 54, the carriage assembly 22 is rotated at an angle corresponding to the amount of current, and the magnetic head 46 is moved and positioned on a desired track of the magnetic disk 12. .
In the CSS type HDD, the magnetic head 46
It is waiting in the SS zone 14a, and is moved to the data zone 14b via the carriage assembly 18 during operation to record or reproduce data.

As shown in FIG. 1, the board unit 22
Rectangular substrate body 56 fixed on the bottom wall of case 10
A plurality of electronic components, connectors, and the like are mounted on the board main body. The board unit 22
Has a flexible flat cable 62 that electrically connects the substrate body 56 and the carriage assembly 18. The flexible flat cable 62 extends from the board body 56, and the distal end thereof is attached to the bearing assembly 28 on the carriage assembly 18. The lead wire 46 a of the magnetic head 46 extends over the suspension 44 and the arm 34 and is connected to the flexible flat cable 62.

On the other hand, the HDD has a magnetic suction type carriage lock mechanism 60 for locking the carriage assembly 18 in a state where the magnetic head 46 is positioned on the CSS zone 14a of the magnetic disk 14. 2 and 3
As shown in FIG. 7, a carriage lock mechanism 60 functioning as a carriage lock means includes a substantially prismatic locking magnet 62 provided separately from the magnet 54 of the VCM 20, an attraction pin 63 functioning as a magnetic member, and a pair of magnetic paths. It is provided with a forming member 64.

The suction pin 63 is the carriage assembly 1
8, and extends from the support frame to the vicinity of the lower yoke 50 in parallel with the rotation center axis of the bearing assembly 28. The locking magnet 62 is provided on the bracket 6 as a support member erected on the lower yoke 50.
5 and extends parallel to the center axis of rotation of the bearing assembly 28. The bracket 65 is formed of a non-magnetic material. Further, the locking magnet 62 is arranged in the movement path of the attraction pin 63 with the rotation of the carriage assembly 18.

The pair of magnetic path forming members 64 are
2 are provided at both ends in the axial direction. Each magnetic path forming member 64 has, for example, a thin hollow capsule 66 having a substantially oval shape and fixed to the axial end of the locking magnet 62, and a magnetic fluid 68 filled in the capsule. The capsule 66 is formed of an elastic material such as rubber or synthetic resin to have a size of about 1.5 to 2 mm in diameter. The locking magnet 62 protrudes into the capsule 66. Also,
About 50 to 80% of the inner space of the capsule 66 is filled with, for example, an iron-based magnetic fluid 68, and the rest is filled with a gas such as air. The magnetic fluid 68 can flow inside the capsule 66 according to the state of the magnetic flux received from the locking magnet 62.

In the HDD configured as described above,
For example, when the power is turned off, the VCM 20 is driven by the back electromotive current generated by the remaining rotation of the spindle motor 16, and the carriage assembly 18 is rotated in the inner circumferential direction of the magnetic disk 14. When the carriage assembly 18 rotates to a stop position where the magnetic head 46 is positioned on the CSS zone 14a of the magnetic disk 14, the carriage assembly 18 is moved to a carriage lock mechanism 60.
Is locked in the stop position.

That is, as shown in FIG. 3, the support frame 3 of the carriage assembly 18 is in the stop position.
The suction pin 63 fixed to 8 is opposed to the locking magnet 62 in parallel and adjacent thereto, and contacts the pair of capsules 66. Then, the magnetic flux of the locking magnet 62 is
, The magnetic fluid 68 in each capsule 66 flows to the suction pin 63 side. Thereby,
A closed magnetic path is formed from a magnet N pole for locking → a magnetic fluid 68 → a suction pin 63 → a magnetic fluid 68 → a magnet S pole for locking.
The magnetic flux from the locking magnet 62 flows through the closed magnetic path. Accordingly, the suction pin 63 is sucked by the pair of capsules 66, and the carriage assembly 18 is stopped, and
The magnetic head 46 is connected to the CSS zone 14 of the magnetic disk 14.
Locked on a. Since the inside of the closed magnetic circuit is entirely made of a magnetic material, the magnetic flux easily flows and a large locking force can be obtained.

On the other hand, when the power supply of the HDD is turned on and the starting current is supplied to the VCM 20, the carriage assembly 18 is rotated in the outer peripheral direction of the magnetic disk 14. FIG.
As shown in (a), the suction pin 63 is separated from the pair of magnetic path forming members 64 with the rotation of the carriage assembly 18. Thereby, the carriage assembly 1
8 is released, and the magnetic head 46 is moved from the CSS zone 14a to a desired position on the data zone 14b.

At this time, the magnetic path forming member 64 and the suction pin 63
Since the air becomes hard to pass the magnetic flux, the suction force acting on the suction pin rapidly decreases. The direction of the magnetic flux from the locking magnet 62 is a loop-like trajectory from the north pole to the south pole. With such a change in the magnetic flux, the magnetic fluid 68 in each capsule 66 has its center at the suction pin 6.
3 flows toward the locking magnet 62 side.
Therefore, when the attraction pin 63 is separated from the magnetic path forming member 64, the magnetic force acting on the attraction pin is rapidly reduced, and the magnetic head 46 is moved from the data zone 14b to the CSS zone 14a.
, That is, even when the attracting pin 63 is located relatively close to the locking magnet 62, the magnetic head 46 is not affected by the magnetic force from the locking magnet. Accurate positioning can be performed.

Further, as shown in FIG. 4B, when the carriage assembly 18 runs away and the suction pin 63 collides with the pair of magnetic flux forming members 64, the capsules 66 of the respective magnetic flux forming members are bent by the impact and simultaneously. The magnetic fluid 68 also receives the impact force and flows in a direction away from the suction pin 63.
Therefore, the kinetic energy of the suction pin 63 is converted not only into the deformation of the capsule 66 but also into the kinetic energy of the magnetic fluid 68, similarly to the principle of a general dynamic vibration absorber. Therefore, compared to the case where only the shock absorbing member such as rubber is used, excellent shock absorbing performance can be obtained, and the carriage lock mechanism 60 and the entire HDD can be prevented from being damaged.

According to the HDD configured as described above,
The carriage lock mechanism 60 has a magnetic path forming member 64 that forms a closed magnetic path in cooperation with the locking magnet 62 and the attraction pin 63, and each magnetic path forming member 64 has an elastic hollow capsule 66 and an elastic capsule. Since the magnetic fluid 68 is provided, the closed magnetic path can be made of a magnetic material, and a large locking force can be obtained.
Therefore, it is possible to reliably lock the carriage assembly 18 at the stop position. At the same time, during the operation of the HDD, the locking force acting on the suction pin can be almost eliminated, and the positioning accuracy of the magnetic head can be improved. Further, the elasticity of the capsule 66 and the shock absorbing ability by the movement of the magnetic fluid make it possible to greatly reduce the damage to the HDD during runaway of the carriage assembly.

FIG. 5 schematically shows a carriage lock mechanism 60 according to a second embodiment of the present invention. According to the second embodiment, the locking magnet 62 is directly fixed to the lower yoke 50 without any intervening support member, and extends in parallel with the rotation center axis of the carriage assembly 18. The lower end of the suction pin 63 faces the surface of the lower yoke 50 with a small gap. The magnetic path forming member 64 is attached only to the extending end of the locking magnet 62. The magnetic path forming member 64 includes a hollow capsule 66 having elasticity and a magnetic fluid 68 filled in the capsule, similarly to the above-described embodiment.

According to the second embodiment, the lower yoke 50 made of an iron-based magnetic material functions as a base-side magnetic path forming member of the locking magnet 62, and in the locked state shown in FIG. Is the locking magnet 62 → magnetic fluid 68 →
A closed magnetic path is formed that flows through the attraction pin 63 → the lower yoke 50 → the locking magnet. And inside this closed magnetic circuit,
It is made of a magnetic material.

In the second embodiment having such a configuration, the same operation and effect as in the above-described embodiment can be obtained. Further, since only one hollow component filled with the magnetic fluid 68 is required, the carriage lock mechanism 60 can be reduced in size and the HDD can be reduced in thickness.

According to the carriage lock mechanism 60 according to the third embodiment of the present invention shown in FIG. 6, the pair of magnetic path forming members 64 are attached to the attraction pins 63 instead of the locking magnets 62. ing. The configuration of each magnetic path forming member 64 is the same as that of the above-described embodiment, and the suction pin 63 extends through these magnetic path forming members. The locking magnet 62 is fixed to the lower yoke 50 via a non-magnetic bracket 65.

Also in the carriage lock mechanism 60 configured as described above, at the time of locking shown in FIG. 6A, a closed magnetic path is formed by the locking magnet 62, the magnetic fluid 68, the suction pin 63, and the magnetic fluid 68. You. Therefore, the carriage assembly 18 can be locked with a strong locking force. At the same time, as shown in FIG. 6B, when the lock is released, the center of the magnetic fluid 68 filled in the capsule 66 of each magnetic path forming member 64 moves to the suction pin 63 side due to the surface tension, and the lock is released. It is separated from the magnet 62.
Therefore, at positions other than the lock position, the locking magnet 62
, The locking force acting on the suction pin 63 decreases rapidly,
An adverse effect on the positioning accuracy of the magnetic head can be reduced. Further, when the carriage assembly 18 runs away, as shown in FIG. 6C, the elastic deformation of the capsule 66 and the movement of the magnetic fluid 68 cause the locking magnet 6 to move.
2 can be absorbed to prevent the HDD from being damaged.

According to the carriage lock mechanism 60 according to the fourth embodiment of the present invention shown in FIG. 7, the locking magnet 62 is directly fixed to the lower yoke 50, and the suction pin 63 has a single magnetic path. Only the member 64 is attached.
The lower end of the suction pin 63 faces the surface of the lower yoke 50 with a small gap.

According to the fourth embodiment, similarly to the above-described second embodiment, the lower yoke 50 made of an iron-based magnetic material is used as the base-side magnetic path forming member of the locking magnet 62. Function, and in the locked state shown in FIG.
Line of magnetic force is locking magnet 62 → magnetic fluid 68 → suction pin 6
3 → the lower yoke 50 → the closed magnetic path flowing through the locking magnet is formed.

Therefore, in the fourth embodiment having such a configuration, the same operation and effect as those of the above-described embodiment can be obtained. Further, since only one hollow component filled with the magnetic fluid 68 is required, the carriage lock mechanism 60
This is effective in reducing the size of the HDD and the thickness of the HDD.

FIGS. 8 and 9 show a carriage lock mechanism 60 according to a fifth and a sixth embodiment of the present invention. That is, the suction pin 63 is fixed to the support frame 58 of the carriage assembly, and the suction pin 63 is fixed to the fixed side, that is, the lower yoke 50. Note that the support frame 58 is formed of aluminum or the like.

According to the fifth embodiment, the locking magnet 62 extends parallel to the rotation center axis of the carriage assembly 18 and projects vertically from the support frame 58. The magnetic path forming members 64 are attached to both ends of the locking magnet 62, respectively. The configuration of each magnetic path forming member 64 is the same as in the above-described embodiment.

On the other hand, according to the sixth embodiment, the pair of magnetic path forming members 64 is attached to the attraction pin 63 side,
Each is arranged so as to be able to contact both ends of the locking magnet 62.

In the fifth and sixth embodiments configured as described above, the same operation and effect as those of the above-described embodiment can be obtained. In the fifth and sixth embodiments, the magnetic path forming member 64 is not limited to the pair, and may be configured to include only the magnetic path forming member on the side remote from the lower yoke 50. In this case, the locking magnet 62 is disposed such that the lower end thereof faces the upper surface of the lower yoke 50 with a small gap, and uses the lower yoke as a magnetic path forming member.

FIG. 10 shows a carriage lock mechanism 60 according to a seventh embodiment of the present invention. The seventh embodiment has a configuration similar to that of the second embodiment shown in FIG. 5, and is different in that a solid magnetic member 80 is used as the magnetic material of the magnetic path forming member 64. . The magnetic member 80 is formed of, for example, an iron-based magnetic material, and has a prismatic shape extending in a direction orthogonal to the locking magnet 62. In the capsule 66 of the magnetic forming member 64,
In addition to the magnetic member 80, a magnetic fluid may be filled.

In the seventh embodiment configured as described above, the same operation and effect as in the second embodiment can be obtained. Also, by using the solid magnetic material 80, the magnetic flux can pass more easily than when using a magnetic fluid,
The locking force can be improved.

According to the eighth embodiment shown in FIG.
The magnetic path forming member 64 is moved from the upper end of the locking magnet 62 fixed to the lower yoke 50 to the carriage assembly 18.
A leaf spring 82 extending toward the suction pin 63 on the side. The leaf spring 82 is formed of an iron-based magnetic material. In the retracted position shown by a solid line in FIG.
Are arranged so as to be deviated from the movement route.

According to the carriage lock mechanism 60 having the above structure, as shown in FIGS. 11A and 11B, the carriage assembly 18 is rotated to the stop position and
When the plate spring approaches the plate spring 82, the plate spring 82 is attracted to the suction pin 63 side by the magnetic force and is elastically deformed to the lock position shown in the drawing, and its tip end is sucked by the suction pin. As a result, a closed magnetic path passing through the locking magnet 62, the leaf spring 82, the attraction pin 63, and the lower yoke 50 is formed.

As shown in FIGS. 11 (c) and 11 (d), when the suction pin 63 separates from the tip of the leaf spring 82 in response to the rotation of the carriage assembly 18 when the lock is released, the leaf spring 82 It returns to the retracted position due to its own elasticity, and separates from the movement path of the suction pin 63. As a result, the locking force acting on the attraction pin 63 via the leaf spring 82 is sharply reduced, and the positioning accuracy of the magnetic head can be improved.

Further, the use of the leaf spring 82 as the magnetic material makes it easier for the magnetic flux to pass than in the case where a magnetic fluid is used, thereby improving the locking force. Furthermore,
When the carriage assembly 18 runs away, the impact of the elasticity of the leaf spring 82 can be reduced, and damage to the HDD can be reduced.

According to the ninth embodiment shown in FIG.
The locking magnet 62 of the carriage lock mechanism 60 is fixed to the support frame 58 of the carriage assembly, and the suction pin 63 is attached to the lower yoke 50. The locking magnet 62 and the attraction pin 63 extend in parallel with the rotation center axis of the carriage assembly.

The lower end of the locking magnet 62 is opposed to the upper surface of the lower yoke 50 with a small gap, and the upper end extends above the support frame 58.
A magnetic path forming member 64 is provided at the upper end of the locking magnet 62.

The magnetic path forming member 64 has a thin hollow capsule 66 having elasticity and a solid magnetic body 84 accommodated in the capsule. The capsule 66 has a cylindrical shape with both ends closed, and the upper end of the locking magnet 62 projects coaxially into the capsule 66. For example, the iron-based magnetic body 84 is formed in an annular shape, and can freely rotate inside the capsule 66 around the locking magnet 62. The capsule 66 may be filled with a magnetic fluid or a gas together with the magnetic material 84.

In the ninth embodiment configured as described above, the same operation and effect as those of the above-described embodiment can be obtained. In addition, by using the solid magnetic material 84, the magnetic flux passes more easily than when using a magnetic fluid, and it is possible to improve the locking force.

In the second to ninth embodiments, the structure other than the carriage lock mechanism 60 is the same as that of the embodiment shown in FIGS. 1 to 4, and the same parts are denoted by the same reference numerals. And the detailed description is omitted.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the lock magnet or the attraction pin of the carriage lock mechanism is not limited to the lower yoke, and may be attached to the upper yoke. As shown in FIG. 13, the capsule of the magnetic path forming member may be formed so as to accommodate a locking magnet or an attraction pin together with a magnetic fluid or a magnetic substance.

[0061]

As described above in detail, according to the present invention, at the stop position of the carriage means, a closed magnetic path made of a magnetic material is formed, and a part of the magnetic material is moved by the carriage means or the locking magnet. A magnetic disk drive capable of preventing the adverse effect of the locking magnet during operation while maintaining a strong locking force can be provided by employing a configuration that can be moved in accordance with the magnetic flux of the magnetic disk drive.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a part of a carriage assembly and a VCM of the magnetic disk drive.

FIG. 3 is a schematic diagram showing a locked state of a carriage lock mechanism in the magnetic disk drive.

FIG. 4 is a schematic diagram showing a state when the carriage lock mechanism is unlocked and a state where the carriage runs out of control.

FIG. 5 is a view schematically showing a carriage lock mechanism according to a second embodiment of the present invention.

FIG. 6 is a view schematically showing a carriage lock mechanism according to a third embodiment of the present invention.

FIG. 7 is a view schematically showing a carriage lock mechanism according to a fourth embodiment of the present invention.

FIG. 8 is a diagram schematically showing a carriage lock mechanism according to a fifth embodiment of the present invention.

FIG. 9 is a view schematically showing a carriage lock mechanism according to a sixth embodiment of the present invention.

FIG. 10 is a diagram schematically showing a carriage lock mechanism according to a seventh embodiment of the present invention.

FIG. 11 is a view schematically showing a carriage lock mechanism according to an eighth embodiment of the present invention.

FIG. 12 is a view schematically showing a carriage lock mechanism according to a ninth embodiment of the present invention.

FIG. 13 is a diagram schematically showing a modified example of the capsule in the carriage lock mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Case 14 ... Magnetic disk 14a ... CSS zone 14b ... Data zone 16 ... Spindle motor 18 ... Carriage assembly 20 ... VCM (voice coil motor) 38 ... Support frame 50 ... Lower yoke 60 ... Carriage lock mechanism 62 ... Locking magnet 63 ... Suction pin 64 ... Magnetic path forming member 65 ... Bracket 66 ... Capsule 68 ... Magnetic fluid 80,84 ... Magnetic body 82 ... Leaf spring

Claims (12)

[Claims] A case accommodating a magnetic disk; a carriage assembly movably provided in the case; a case supported by the carriage assembly; and a seek operation on the magnetic disk in response to the movement of the carriage assembly. A head means for performing information processing on the disk, having a yoke and a driving magnet provided in the case,
Drive means for moving the carriage assembly to move the head means to an arbitrary position on the magnetic disk; and the carriage assembly having moved to a stop position where the head means is located in a predetermined area on the magnetic disk. A carriage locking means for locking the carriage assembly at a stop position by a magnetic force, wherein the carriage locking means includes a locking magnet attached to one of the yoke and the carriage assembly, and the yoke and the carriage assembly. A magnetic member attached to the other of the two, and is attached to one of the locking magnet and the magnetic member, and when the carriage assembly moves to a stop position, forms a closed magnetic path in cooperation with the locking magnet and the magnetic member. Moveable Comprises a magnetic path forming member having a sexual body, a magnetic disk drive unit, characterized in that to lock the said carriage assembly in the stop position by sucking the magnetic member by the magnetic force of the locking magnet. 2. A case accommodating a magnetic disk, a carriage assembly movably provided in the case, and supported by the carriage assembly, and seeking on the magnetic disk according to the movement of the carriage assembly. A head means for performing information processing on the disk, having a yoke and a driving magnet provided in the case,
Drive means for moving the carriage assembly to move the head means to an arbitrary position on the magnetic disk; and the carriage assembly having moved to a stop position where the head means is located in a predetermined area on the magnetic disk. A carriage locking means for locking the carriage assembly at a stop position by a magnetic force, wherein the carriage locking means includes a locking magnet attached to one of the yoke and the carriage assembly, and the yoke and the carriage assembly. And a resilient member that is attached to one of the locking magnet and the magnetic member, and is in contact with the other of the locking magnet and the magnetic member when the carriage assembly moves to the stop position. Having And a magnetic body that is movably accommodated in the capsule and that forms a closed magnetic path in cooperation with the lock magnet and the magnetic member when the carriage assembly moves to the stop position. A magnetic disk drive, wherein the magnetic member is attracted by a magnetic force of a magnet to lock the carriage assembly at the stop position. 3. The locking magnet is fixed to the yoke via a non-magnetic member, and the magnetic member is fixed to the carriage assembly. The pair of magnetic members are separated from each other and can contact the magnetic member. 3. The magnetic disk drive according to claim 1, wherein a path forming member is provided on the locking magnet. 4. The locking magnet is fixed to the yoke, the magnetic member is fixed to the carriage assembly, and has an end adjacent to the yoke, and the magnetic path forming member is fixed to the yoke. 3. The closed magnetic circuit according to claim 1 or 2, wherein the magnetic member is attached to the locking magnet at a stop position so as to be in contact with the magnetic member, and forms a closed magnetic path in cooperation with the locking magnet, the magnetic member, and the yoke. A magnetic disk drive according to any one of the preceding claims. 5. The locking magnet is fixed to the yoke via a non-magnetic member, and the magnetic member is fixed to the carriage assembly, and is separated from each other and each of which is capable of contacting with the locking magnet. 3. The magnetic disk drive according to claim 1, wherein a magnetic path forming member is provided on the magnetic member. 6. The magnet for locking is fixed to the yoke, the magnetic member is fixed to the carriage assembly, and has an end adjacent to and adjacent to the yoke. 3. A closed magnetic circuit is formed in the stop position so as to be able to abut on the locking magnet so as to be in contact with the locking magnet, and forms a closed magnetic circuit in cooperation with the locking magnet, the magnetic member, and the yoke. A magnetic disk drive according to any one of the preceding claims. 7. The locking magnet is fixed to the carriage assembly, the magnetic member is fixed to the yoke, and the pair of magnetic path forming members separated from each other and capable of contacting with the magnetic member are fixed to the locking member. The magnetic disk drive according to claim 1, wherein the magnetic disk drive is provided on a magnet for use. 8. The locking magnet is fixed to the carriage assembly, the magnetic member is fixed to the yoke, and the pair of magnetic path forming members that are separated from each other and that can contact the magnetic member are fixed to the locking member. The magnetic disk drive according to claim 1, wherein the magnetic disk drive is provided on a magnet for use. 9. The magnetic material contained in the capsule contains a magnetic fluid.
7. The magnetic disk drive according to claim 1. 10. The magnetic material contained in the capsule,
9. The magnetic disk drive according to claim 1, wherein the magnetic disk drive includes a solid magnetic material. 11. A case accommodating a magnetic disk, a carriage assembly movably provided in the case, and supported on the carriage assembly to seek on the magnetic disk in accordance with the movement of the carriage assembly. A head means for performing information processing on the disk, having a yoke and a driving magnet provided in the case,
Drive means for moving the carriage assembly to move the head means to an arbitrary position on the magnetic disk; and the carriage assembly having moved to a stop position where the head means is located in a predetermined area on the magnetic disk. A carriage locking means for locking the carriage assembly at a stop position by a magnetic force, wherein the carriage locking means includes a locking magnet attached to one of the yoke and the carriage assembly, and the yoke and the carriage assembly. And a magnetic member attached to one of the locking magnet and the magnetic member and formed of a magnetic material. When the carriage assembly moves to a stop position, the locking magnet and the magnetic member Other Forming a closed magnetic path in cooperation with the lock magnet and the magnetic member to move to a retracted position separated from the lock position when the carriage assembly moves from the stop position. A magnetic disk drive device comprising: a member for attracting the magnetic member by a magnetic force of the locking magnet to lock the carriage assembly at the stop position. 12. The locking magnet is fixed to the yoke, the magnetic member is fixed to the carriage assembly, and the magnetic path forming member is attached to the locking magnet and is located at the retracted position. 12. The magnetic disk drive according to claim 11, further comprising a leaf spring that is elastically deformed to the lock position by a magnetic force when the carriage assembly moves to a stop position.