JPH11306704A - Magnetic disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic disk apparatus capable of reducing the size thereof and stably holding a magnetic head while not operating. SOLUTION: A ramp load mechanism 25, which holds a magnetic head 40 at a position apart from a surface of a magnetic disk 16 when the magnetic head 40 moves to the outermost periphery of the magnetic disk 16, has a tab 50 extending substantially perpendicular to the longitudinal axis A of a suspension 38 from a side edge of the suspension 38 and ramps 52a, 52b disposed in the outside of the magnetic disk 16. The suspension 38 has an asymmetric shape with respect to its longitudinal axis, and is formed so that the portion closer to the outer periphery of the magnetic disk 16 with respect to the longitudinal axis has higher rigidity than another portion closer to the inner periphery of the magnetic disk 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive having a ramp load mechanism.

[0002]

2. Description of the Related Art In recent years, magnetic disks have been widely used as large-capacity memory devices in electronic devices such as personal computers. Generally, a magnetic disk device includes a magnetic disk disposed in a case, a spindle motor for supporting and rotating the magnetic disk, a carriage assembly for supporting the magnetic head, a voice coil motor for driving the carriage assembly, and a substrate. And a unit.

[0003] The carriage assembly includes a bearing attached to the case, a plurality of arms extending from the bearing, and a suspension extending from each arm.
The magnetic head is attached to the extension end of the suspension.

In recent years, portable small personal computers have become widespread, and magnetic disk devices mounted on such personal computers are required to have improved reliability against shocks and the like when carried.

Therefore, in recent years, a mechanism provided with a ramp load mechanism has been provided as a mechanism for holding the magnetic head when the magnetic disk drive is not operating. This ramp loading mechanism includes a ramp provided outside the magnetic disk,
When the magnetic disk drive is not operating, the carriage assembly is rotated around the magnetic disk, and the suspension rides on the ramp. As a result, the magnetic head is held at a position separated from the surface of the magnetic disk, thereby preventing collision with the magnetic disk when receiving an impact.

[0006]

Conventionally, as a ramp load mechanism, a tab is provided which extends in the axial direction of the suspension from the tip of the suspension, and a ramp is arranged so that a part thereof overlaps the outer periphery of the magnetic disk. Is provided. However, in this case, the ramp must be arranged in a state of being inserted into the space between the magnetic disks, and it is difficult to save the space between the magnetic disks, and the entire magnetic disk device becomes thick.

In another magnetic disk drive, a tab extending in the axial direction of the suspension as described above is formed to be long so as to protrude from the outer periphery of the magnetic disk, and a ramp can be arranged outside the magnetic disk. Is provided. According to this configuration, it is possible to reduce the space between magnetic disks and reduce the thickness of the entire magnetic disk device.

However, the extension of the tab protruding from the outer periphery of the magnetic disk causes a problem that the shock resistance upon receiving an impact is reduced, and the magnetic disk drive is designed to avoid interference between the tab and the housing. As a result, the size of the housing must be increased, and the size of the entire apparatus cannot be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to reduce the size of the device and to reduce the impact resistance when receiving an impact, and to reduce the impact resistance when the device is not operated. Another object of the present invention is to provide a magnetic disk device capable of stably holding a magnetic head.

[0010]

In order to achieve the above object, a magnetic disk drive according to the present invention comprises a magnetic disk, driving means for supporting and rotating the magnetic disk, and information transfer to the magnetic disk. A magnetic head for performing recording and reproduction, a plate-like arm rotatably supported,
An elastically deformable plate-shaped suspension extending from the tip of the arm and having the magnetic head attached to the tip of the arm, the carriage movably supporting the magnetic head with respect to the magnetic disk An assembly and a ramp load mechanism for supporting the magnetic head at a position separated from the magnetic disk via the suspension when the magnetic head moves to the outer peripheral portion of the magnetic disk. Then, the ramp loading mechanism extends from the suspension and the ramp provided outside the magnetic disk in a direction intersecting the longitudinal axis of the suspension, and when the magnetic head moves to the outer peripheral portion of the magnetic disk, And an engaging portion that rides on the ramp.

Further, according to the magnetic disk drive of the present invention, the ramp loading mechanism extends the ramp provided outside the magnetic disk from the suspension in a direction intersecting the longitudinal axis of the suspension. An engaging portion that rides on the ramp when the magnetic head moves to the outer peripheral portion of the magnetic disk, wherein the suspension is formed around the longitudinal axis of the suspension generated when the engaging portion engages with the ramp. The suspension is formed in an asymmetrical shape with respect to the longitudinal axis of the suspension so as to prevent torsion.

Further, according to the magnetic disk drive of the present invention, the suspension is formed such that an outer peripheral portion of the magnetic disk has higher rigidity than an inner peripheral portion with respect to the longitudinal axis. It is characterized by:

[0013] The suspension may have an asymmetrical shape and a configuration in which the outer peripheral portion has high rigidity. The outer peripheral portion of the magnetic disk is formed to be thicker than the inner peripheral portion with respect to the longitudinal axis of the suspension. With respect to the longitudinal axis, the width of the outer peripheral portion of the magnetic disk is made larger than the width of the inner peripheral portion.

According to the magnetic disk drive configured as described above, when not operating, the magnetic head is held at a position separated from the surface of the magnetic disk by the ramp load mechanism. Since the engaging portion of the ramp load mechanism extends in a direction intersecting the longitudinal axis of the suspension, the ramp can be arranged outside the magnetic disk. Therefore, as compared with a configuration in which a part of the ramp is placed on the magnetic disk, space saving in the thickness direction of the magnetic disk can be achieved. Further, since the engaging portion extends in a direction intersecting with the longitudinal axis of the suspension, the engaging portion can be easily engaged with the ramp, and does not need to be forcibly lengthened.

[0015] Thus, the impact resistance can be prevented from deteriorating when an impact is received, and the engaging portion does not interfere with the device case, so that the size of the device can be reduced. .

The suspension may have a shape whose thickness or width is asymmetric with respect to its longitudinal axis, or the rigidity of the outer peripheral portion of the magnetic disk of the suspension may be higher than that of the inner peripheral portion. By increasing the height, during loading and unloading by the ramp load mechanism, to prevent the twist of the suspension around the longitudinal axis,
The magnetic head can be held substantially parallel to the surface of the magnetic disk without causing a roll angle.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which 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, the HDD has a rectangular box-shaped case 12 with an open upper surface, and a top cover 14 that is screwed to the case with a plurality of screws 11 to close an upper end opening of the case. .

Inside the case 12, a magnetic disk 16 as a magnetic recording medium, a spindle motor 18 as a driving means for supporting and rotating the magnetic disk, and a plurality of magnetic heads for writing and reading information to and from the magnetic disk These magnetic heads are
Carriage assembly 2 movably supported with respect to
2. A voice coil motor (hereinafter referred to as VCM) 24 for rotating and positioning the carriage assembly, and a ramp load mechanism 25 for holding the magnetic head at a position separated from the magnetic disk when the magnetic head moves to the outermost periphery of the magnetic disk. , And a substrate unit 21 having a head IC and the like are housed.

On the outer surface of the bottom wall of the case 12, a spindle motor 18, a VCM 2
4, and a printed circuit board (not shown) for controlling the operation of the magnetic head are screwed.

The magnetic disk 16 has a diameter of 65 mm (2.
5 inches) and has a magnetic recording layer on the upper and lower surfaces. The magnetic disk 16 holds the spindle motor 1
8 is coaxially fitted to a hub (not shown), is clamped by a clamp spring 17, and is driven to rotate at a predetermined speed.

As shown in FIGS. 1-3, the carriage assembly 22 includes a bearing assembly 26 fixed on the bottom wall of the case 12. The bearing assembly 26 has a pivot 27 that stands vertically to the bottom wall of the case 12 and a cylindrical hub 28 that is rotatably supported on the pivot via a pair of bearings. . An annular flange 30 is formed at the upper end of the hub 28, and a threaded portion 31 is formed on the outer periphery of the lower end.
Are formed.

The carriage assembly 22 includes two arms 32a, 32b and a spacer ring 34 attached to the hub 28, and two magnetic head assemblies 36 supported by each arm.

The arms 32a and 32b are, for example, S
With a stainless steel material such as US304, a plate thickness of 250
It is formed in a plate shape of about μm and has a predetermined rigidity, and has a circular through hole 33 at one end, that is, at the base end.

Each magnetic head assembly 36 includes an elongated plate-like suspension 38 that can be elastically deformed, and a magnetic head 40 fixed to the tip of the suspension.
The suspension 38 is formed of a leaf spring, and its base end is formed by spot welding or bonding.
It is fixed to the tip of 2b and extends from the arm.

Each magnetic head 40 has a substantially rectangular slider and a recording / reproducing MR (magnetic resistance) head formed on the slider, and is provided on a gimbal portion (not shown) provided at the tip of the suspension 38. Fixed. Each magnetic head 40 has four electrodes (not shown).

The fixed arms 32a and 32b of the magnetic head assembly 36 are fitted on the outer periphery of the hub in a state of being stacked on the flange 30 by inserting the hub 28 through the through hole 33. Also, the spacer ring 34
It is fitted to the outer periphery of the hub 28 while being sandwiched between the arms 32a and 32b.

The two arms 32a and 32b fitted on the outer periphery of the hub 28 and the spacer ring 34
The nut 42 and the flange 30 screwed into the screw portion 31
And fixedly held on the outer peripheral surface of the hub. As a result, the two arms 32a and 32b are located parallel to each other at a predetermined interval and extend from the hub 28 in the same direction.

The magnetic heads 40 of the magnetic head assembly 36 attached to the arms 32a and 32b are located facing each other, and are rotatable integrally with the arm and the hub 28. The spacer ring 34 includes the arm 32a,
It has two support frames 43 extending in the opposite direction to 32b, and a voice coil 44 constituting a part of the VCM 16 is fixed to these support frames. Further, the spacer ring 34 is formed with a screw hole 34a for screwing an extended end of a main FPC described later.

As shown in FIGS. 1 to 3, each of the suspensions 38 has a tab 50 extending from its distal end.
Is provided integrally. The tab 50 functions as an engaging portion that constitutes a part of a ramp load mechanism 25 described later, and extends in a direction intersecting with the longitudinal axis A of the suspension 38, for example, a direction substantially orthogonal to the longitudinal axis A of the suspension 38. It extends toward the outer peripheral direction with respect to the disk 16.

As shown in FIGS. 3 and 4, each suspension 38 is formed asymmetrically about the longitudinal axis A thereof. That is, the suspension 38 is arranged such that the outer peripheral portion 38 b of the magnetic disk 16 is
Are formed so as to have higher rigidity than the inner peripheral side portion 38a. According to the present embodiment, the suspension 38 is formed such that the outer peripheral portion of the magnetic disk 16 is thicker than the inner peripheral portion around the longitudinal axis A.

As can be clearly understood from FIG. 1, when the carriage assembly 22 constructed as described above is incorporated in the case 12, the magnetic disk 16
It is located between 2a and 32b. And the arm 32
The magnetic head 40 attached to the suspension 38 extending from the a and 32b is in contact with the upper and lower surfaces of the magnetic disk 16, respectively, and holds the magnetic disk 16 from both sides. Each magnetic head 40 has a suspension 3
A predetermined head load is applied by the spring force of No. 8 and is urged toward the surface of the magnetic disk.

On the other hand, as shown in FIG. 1, when the carriage assembly 22 is incorporated in the case 12,
The voice coil 44 fixed to the support frame 43 of the spacer ring 34 is located between a pair of yokes 48 fixed on the case 12, and forms the VCM 24 together with these yokes and a magnet (not shown) fixed to one of the yokes. doing. Then, by energizing the voice coil 44, the carriage assembly 22 rotates, and the magnetic head 40 is moved and positioned on a desired track of the magnetic disk 16.

As shown in FIG. 1, the board unit 21
Rectangular substrate body 51 fixed on the bottom wall of case 12
A plurality of electronic components, connectors, and the like are mounted on the board main body. Also, the board unit 21
Is a strip-shaped main flexible printed circuit board (hereinafter referred to as main FPC) 54 extending from the board body 51.
Are integrally provided. Extension end 54 of main FPC 54
a is a spacer ring 3 of the carriage assembly 22;
4 and is provided with a number of connection pads (not shown) at the extended end.

On the other hand, each magnetic head 40 of the carriage assembly 22 is electrically connected to a corresponding connection pad of the main FPC 54 via a relay flexible printed circuit board (hereinafter referred to as a relay FPC) 60. As shown in FIGS. 2 and 3, the relay FPC 60
Are the arms 32a, 3a of the carriage assembly 22.
2b and the surface of the suspension 38, which are attached and fixed, and extend from the distal end of the suspension to the proximal end of the arm.

The relay FPC 60 is formed in an elongated strip shape as a whole, and has a distal end portion 60a located at the distal end of the suspension 38 and a connection end portion 60b derived from the base ends of the arms 32a and 32b. In the tip portion 60a,
Four first electrode pads (not shown) electrically connected to the electrodes of the magnetic head 40 are provided. Also, four second electrode pads 62 are provided at the connection end 60b, and these second electrode pads are soldered to connection pads provided at the extended end of the main FPC 54. Thus, the magnetic head 40 is electrically connected to the main FPC 54 via the relay FPC 60.

On the other hand, as shown in FIGS. 1, 2 and 5 and 6, the ramp loading mechanism 25 is provided on the bottom wall of the case 12 and a pair of ramps 52a located outside the magnetic disk 16. , 52b. These lamps 52 are supported by a support shaft 5 erected on the bottom wall of the case 12.
5 and each extend substantially parallel to the surface of the magnetic disk 16.

The pair of ramps 52a and 52b extend in the radial direction of the magnetic disk 16 to the vicinity of the outer peripheral edge of the magnetic disk, and are disposed on the movement path of the tab 50 provided on the suspension 38. . Also,
The ramp 52a is provided substantially flush with the upper surface of the magnetic disk 16, and the ramp 52b is provided substantially flush with the lower surface of the magnetic disk 16. Further, a ramp 53 is formed at the extending end of each ramp so as to be inclined in a direction away from the magnetic disk.

According to the HDD configured as described above,
As shown in FIGS. 1 and 6A, the carriage assembly 2 is operated by the VCM 24 in a normal operation state.
By rotating the magnetic disk 2, the magnetic head 40 is moved onto a desired track of the magnetic disk 16 and records or reproduces information on or from the magnetic disk.

5 and 6 when the HDD is not operating.
As shown in (b), the carriage assembly 22 is rotated by the VCM 24 so that the magnetic head 40 is rotated.
Is moved to the stop position on the outermost periphery of the magnetic disk 16. Then, the tab 50 extended from the suspension 38
Project outward from the outer peripheral edge of the magnetic disk 16, and respectively correspond to ramps 52 a and 52 b via slopes 53.
Ride up. Thereby, each suspension 38 is elastically deformed along its longitudinal axis A, and the pair of magnetic heads 4
Numerals 0 are kept at a predetermined distance from the upper and lower surfaces of the magnetic disk 16, respectively.

On the other hand, when the HDD is operated again, the carriage assembly 2 is rotated with the magnetic disk 16 rotating.
2 is rotated to the inner peripheral side of the magnetic disk. Then, the tab 50 of each suspension 38 passes over the slope 53 and separates from the corresponding ramp 52a, 52b. As a result, the magnetic head 40 approaches the surface of the magnetic disk 16 to a position where information can be recorded and reproduced, and in this state, the carriage assembly 22 moves to a desired track.

When the tab 50 on the suspension 38 rides on the ramp 52 by the ramp loading mechanism 25,
Actually, since the tab 50 is not fixed, the tab 50 is unstable, and it is difficult to continue the holding. In particular, when the voice coil 44 is not energized, the holding force due to the rotation of the carriage assembly 22 is lost.
2 may cause a skid, and the lamp 52 may easily come off the lamp 52.

However, as a method of solving the above-mentioned problem, for example, as shown in FIG. 9A, convex portions 58a and 58b are provided on the tab 50, and concave portions 59a and 59b are formed on the corresponding lamp 52. It should be provided. By providing these uneven portions on the tab and the lamp, when the tab 50 and the lamp 52 are engaged with each other, FIG.
As shown in FIG. 5, each of the projections 58a, 58b of the tab 50 engages with the corresponding recess 59a, 59b of the ramp 52, so that the tab 50 can continue to be retained while being latched by the ramp 52. . Therefore, the magnetic head can be stably held by such a mechanical method without relying on electrical holding, and the above-described disadvantage can be solved.

The combination of the meshing shapes is not limited to the above-mentioned combination, and a configuration in which a concave portion is provided on the tab side and a convex portion is provided on the lamp side may be employed. In addition, not only the combination of the uneven shapes but also the combination of the step shapes may be used.

According to the HDD configured as described above,
When not operating, the ramp load mechanism 25 causes the magnetic head 4
0 can be held at a position separated from the magnetic disk 16, and even when an external impact acts on the HDD, the displacement of the magnetic head, the collision between the magnetic head and the magnetic disk, and the like can be prevented. Thereby, damage to the magnetic head and the magnetic disk can be prevented, and a highly reliable HDD can be obtained.

The tab 50 functioning as an engaging portion of the ramp load mechanism 25 is provided on the longitudinal axis A of the suspension 38.
The lamps 52a and 52b can be disposed outside the magnetic disk 16 because the lamps 52a and 52b are provided so as to extend in a direction intersecting with, for example, a direction orthogonal to the magnetic disk 16. Therefore, as compared with a configuration in which a part of the ramp is placed on the magnetic disk, space saving in the thickness direction of the magnetic disk can be achieved.

The extending direction of the tab 50 is not a direction extending from the tip of the suspension 38 in the axial direction of the longitudinal axis A, but a direction substantially perpendicular to the longitudinal axis A. This is completely different from the method of forcibly extending the tab for the purpose of preventing the tab from overlapping with the magnetic disk, so that the tab length can have a sufficient degree of freedom. As a result, by appropriately shortening the tab length, it is possible to suppress the drop in the impact resistance performance that occurs when the tab is extended,
At the same time, interference between the tab 50 and the case 12 can be easily prevented, and the size of the case 12 can be reduced.

As indicated by the arrows in FIG.
When the vehicle is unloaded / loaded, that is, when the tab 50 rides on the ramp and separates from the ramp, a load T acts on each suspension 38 via the tab 50. Thus, each suspension 38 has a longitudinal axis A
, The bending moment in the width direction around the longitudinal axis A acts simultaneously, and as a whole, the longitudinal axis A
A torsional moment about.

Here, if a general suspension formed symmetrically with respect to the longitudinal axis A is used, this torsional moment causes deflection in the suspension width direction,
As a result, at the time of loading / unloading of the magnetic head 40, the magnetic head 40 causes a roll inclination, and the magnetic head 40 collides with the surface of the magnetic disk 16 to cause damage to the magnetic head or the magnetic disk surface.

However, according to the present embodiment, each suspension 38 is formed asymmetrically on both sides of the longitudinal axis A, and the outer peripheral portion 38b is formed thicker than the inner peripheral portion 38a, and has higher rigidity. ing. For this reason, unlike the above-mentioned general suspension, it is possible to prevent the appearance of Tama in the suspension width direction generated by the torsional moment. As a result, when loading / unloading the magnetic head 40, the magnetic head 40 can be kept substantially parallel to the surface of the magnetic disk 16 without causing roll inclination. Therefore, unnecessary collision between the magnetic head 40 and the surface of the magnetic disk can be prevented, and damage to the magnetic head or the magnetic disk can be prevented.

The loading position when the suspension 38 of the carriage assembly 22 and each magnetic head 40 are arranged at predetermined positions on the surface of the magnetic disk 16 and the installation positions of the ramps 52a and 52b overlap. By mounting the lamp after loading the carriage assembly at a predetermined position, no assembly problem occurs.

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 number of magnetic disks, the number of corresponding magnetic heads, the number of arms, and the like can be increased as necessary, and the number of ramps of the ramp loading mechanism is increased as the number of magnetic heads increases.

The configuration for realizing the asymmetric shape of each suspension is not limited to the configuration in which the thickness of the suspension itself is changed as shown in FIG. 4, but as shown in FIG.
The width of the suspension may be changed by providing a narrow side and a wide side with respect to the longitudinal axis A of the suspension, while keeping the wall thickness constant, to realize an asymmetric shape. In this case, the width of the outer peripheral portion 38b of the magnetic disk is formed to be narrower toward the tip of the suspension than the width of the inner peripheral portion 38a of the magnetic disk, thereby preventing bending in the suspension width direction. Can be.

Further, as shown in FIG. 7 (b), with the wall thickness kept constant, the structure of the suspension 38 is changed to a symmetric load beam portion 38c having high rigidity indicated by oblique lines.
And elastically deformable plate-like spring portions 38d and 38e having a lower rigidity than the load beam portion. The plate-like spring portion 38e has a wide side and the plate-like spring portion 38d has a narrow side.
Asymmetry in the width direction may be realized only by the plate-shaped spring portion.
In this case, the bending is not generated in the load beam portion 38c, but is generated only in the plate-shaped spring portions 39d and 38e. Therefore, the deflection in the width direction of the suspension can be prevented by asymmetry of only the plate-shaped spring portions. it can.

The method of making the suspension shape asymmetrical includes a method of processing the suspension itself.
There is a suspension plate thickness half etching process as shown in FIG. In this case, the processing depth of the suspension plate thickness is changed stepwise in the width direction, so that the outer peripheral portion 38b of the magnetic disk is closer to the inner peripheral portion 3 of the magnetic disk.
It is set to be thicker than 8a.

Further, the configuration for realizing the asymmetrical shape of the suspension is not limited to the case where the shape of the suspension itself is devised. As shown in FIG. Part 38b
Screw 56, crimping,
As shown in FIG. 8B, a plurality of other leaf springs 57 having different widths are superimposed on the suspension 38 having a constant thickness, and the outer peripheral portion of the suspension as a whole is fixed as shown in FIG. 8C may be made thicker than the inner peripheral portion, or as shown in FIG. 8C, a paint 58 may be applied to the surface of the suspension 38 having a constant thickness to obtain a desired thickness distribution.

[0056]

As described in detail above, according to the present invention, sufficient impact resistance can be obtained, and when not operating, the magnetic head can be stably held by the ramp load mechanism to improve reliability. And a magnetic disk drive capable of reducing the size of the drive.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an HDD according to an embodiment of the present invention.

FIG. 2 is a perspective view of a carriage assembly provided in the HDD.

FIG. 3 is an exploded perspective view of the carriage assembly.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a plan view of the HDD, showing a state where the magnetic head has moved to the outermost periphery of the magnetic disk.

FIG. 6 is a side view schematically showing an arrangement relationship between a magnetic head and a suspension, and a lamp in an operation state and a non-operation state of the HDD.

FIG. 7 is a plan view showing a suspension of an HDD according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view corresponding to FIG. 4, showing a suspension according to still another embodiment of the present invention.

FIG. 9 is a side view schematically showing an arrangement relationship between a magnetic head and a suspension and a ramp in an operating state and a non-operating state of an HDD according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Case 16 ... Magnetic disk 21 ... Board unit 22 ... Carriage assembly 24 ... Voice coil motor 25 ... Ramp loading mechanism 26 ... Bearing assembly 38 ... Suspension 40 ... Magnetic head 50 ... Tab 52a, 52b ... Ramp 58a, 58b ... Convex Parts 59a, 59b ... concave parts

Claims (12)

[Claims] A magnetic disk; a driving means for supporting and rotating the magnetic disk; a magnetic head for recording and reproducing information on and from the magnetic disk; a plate-like arm rotatably supported; An elastically deformable plate-shaped suspension extending from the distal end of the arm and having the magnetic head attached to the distal end thereof, the magnetic head being movably supported with respect to the magnetic disk. A carriage assembly; a ramp loading mechanism for supporting the magnetic head at a position separated from the magnetic disk via the suspension when the magnetic head moves to the outer peripheral portion of the magnetic disk;
A ramp provided outside the magnetic disk, and extending from the suspension in a direction intersecting a longitudinal axis of the suspension, when the magnetic head moves to an outer peripheral portion of the magnetic disk. A magnetic disk drive comprising: an engaging portion that rides on the ramp. 2. A magnetic disk, a driving means for supporting and rotating the magnetic disk, a magnetic head for recording and reproducing information on and from the magnetic disk, and a plate-like arm rotatably supported. An elastically deformable plate-shaped suspension extending from the distal end of the arm and having the magnetic head attached to the distal end thereof, the magnetic head being movably supported with respect to the magnetic disk. A carriage assembly; a ramp loading mechanism for supporting the magnetic head at a position separated from the magnetic disk via the suspension when the magnetic head moves to the outer peripheral portion of the magnetic disk;
Wherein the ramp loading mechanism extends from a ramp provided outside the magnetic disk and a direction intersecting a longitudinal axis of the suspension from the suspension, and the magnetic head has moved to an outer peripheral portion of the magnetic disk. An engagement portion that rides on the ramp when the engagement portion engages with the ramp, so that the suspension is prevented from being twisted around the longitudinal axis when the engagement portion engages with the ramp. A magnetic disk drive characterized by being formed in an asymmetric shape with respect to an axis. 3. The suspension according to claim 2, wherein the outer peripheral portion of the magnetic disk has higher rigidity than the inner peripheral portion with respect to the longitudinal axis. Magnetic disk unit. 4. The magnetic disk according to claim 2, wherein in the suspension, an outer peripheral portion of the magnetic disk is formed thicker than an inner peripheral portion with respect to the longitudinal axis. apparatus. 5. The suspension according to claim 1, wherein a width of a portion located on an outer peripheral side of the magnetic disk with respect to the longitudinal axis is:
4. The magnetic disk drive according to claim 2, wherein the magnetic disk drive is formed to have a width larger than a width of a portion located on an inner peripheral side of the magnetic disk. 6. The suspension includes a load beam having a high rigidity, and an elastically deformable plate-like spring having a lower rigidity than the load beam. The load beam includes a longitudinal axis. Are formed symmetrically with respect to the plate-shaped spring portion, with respect to the longitudinal axis,
4. The magnetic disk according to claim 2, wherein a width of a portion located on an outer peripheral side of the magnetic disk is formed to be larger than a width of a portion located on an inner peripheral side of the magnetic disk. Magnetic disk drive. 7. The suspension is formed by laminating a plurality of plates having different widths so that an outer peripheral portion of the magnetic disk is thicker than an inner peripheral portion with respect to the longitudinal axis. 4. The magnetic disk drive according to claim 2, wherein: 8. The suspension, wherein the suspension is fixed on the leaf spring having a uniform thickness, and an outer peripheral portion of the magnetic disk is formed thicker than an inner peripheral portion with respect to the longitudinal axis. 4. The magnetic disk drive according to claim 2, comprising a plurality of bulks formed. 9. The suspension according to claim 1, wherein the suspension has a uniform thickness, and the outer peripheral portion of the magnetic disk is thicker on the leaf spring than the inner peripheral portion with respect to the longitudinal axis. The magnetic disk drive according to claim 2, further comprising: an applied paint. 10. The suspension according to claim 2, wherein an outer peripheral portion of the magnetic disk is formed thicker than an inner peripheral portion with respect to the longitudinal axis by a thickness half etching process. Or the magnetic disk device according to 3. 11. The magnetic recording medium according to claim 11, wherein the engaging portion has a projection extending from the suspension in a direction substantially perpendicular to the longitudinal axis and toward an outer peripheral direction of the magnetic disk. Item 11. The magnetic disk device according to any one of Items 1 to 10. 12. The engaging portion has a projection extending from the suspension in a direction substantially perpendicular to the longitudinal axis and toward an outer peripheral direction of the magnetic disk. The projection according to any one of claims 1 to 10, wherein when the projection is engaged with the lamp, the projection is latched with respect to the lamp by engagement due to unevenness or a step. The magnetic disk device according to the above.