JP2002367304A - Magnetic disk drive - Google Patents

Abstract

(57) [Summary] (With correction) [PROBLEMS] To realize a fastening structure between a carriage body and a pivot sleeve for improving a primary resonance frequency of a carriage without causing a problem due to thermal deformation. A screw (8) is tightened on a flanged nut (19) supported by a flange portion (18) with a flat spring (17) sandwiched from a carriage body (9), and a pivot sleeve (4) is pressed with the tip of the screw (8) to thereby pivot the pivot. The sleeve 4 is elastically fastened to the carriage body 9 in the screw tightening direction, that is, in the elastic bending direction of the flat spring 17, while the screw 8 is
On the opposite side, the pivot sleeve 4 is pressed against the carriage body 9 by the tightening axial force of the screw 8, and the pivot sleeve 4 and the carriage body 9 are rigidly fastened at two places.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive capable of achieving a high recording density, and more particularly to a magnetic disk drive characterized by a fastening structure between a carriage body and a pivot sleeve.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional structure for fastening a carriage and a pivot sleeve of a magnetic disk drive actuator.

[0003] The pivot bearing 1 is constituted by a pivot shaft 2, a bearing 3 and a pivot sleeve 4.

The carriage 6 is fixed to a base (not shown) by tightening a screw 8 through a through hole 7 of a carriage 6 into a screw hole 5 provided in the pivot sleeve 4 to fasten the carriage body 9 and the pivot sleeve 4. It is rotatably supported by the pivot shaft 2.

[0005] Japanese Patent Application Laid-Open No. 2000-149470, for example, describes a technique describing such a technique relating to a fastening structure between the carriage 6 and the pivot bearing 1.

[0006]

The increase in recording density of a magnetic disk drive has been achieved by increasing the accuracy of mechanism positioning in the magnetic recording track width direction. As a means for realizing this, it was necessary to increase the band of the mechanism operation control, that is, to improve the primary resonance frequency of the carriage mechanism.

[0007] However, the magnetic disk drive carriage according to the prior art described above has a carriage body 9 as shown in FIG.
Is fastened to the pivot sleeve 4 only on one side on the circumference of the pivot sleeve 4 and there is no fastening on the other side, so there is a limit to improving the primary resonance frequency of the carriage.

As shown in FIG. 8, the vibration mode of the primary resonance vibration of the above-mentioned conventional magnetic disk drive actuator is a superposition of the following two vibration modes.

One is a translation mode in which the pivot sleeve 4 and the carriage 6 move largely with respect to the pivot shaft 2. This is a so-called spring / mass system vibration mode in which the bearing 3 is a spring and the surrounding pivot sleeve 4 and carriage 6 are masses.

[0010] Still another mode is a carriage 6 bending mode in which the carriage itself bends and deforms in a bow shape with the vicinity of the pivot sleeve 4 as a vertex in the plane of the paper.

The translation mode is a spring / mass system vibration mode, which has been improved by reducing the mass, ie, reducing the weight of the carriage 6, or increasing the rigidity of the spring, ie, the pivot bearing 1.

On the other hand, the improvement in bending stiffness of the carriage body 9 by reinforcement, such as overlaying, is accompanied by an increase in the weight of the carriage 6 and contradicts the weight reduction.

Here, in the carriage bending mode, the carriage body 9 is crushed and deformed from a circular shape to an elliptical shape, whereby bending deformation is more likely to occur. In order to suppress the elliptical deformation, a fastening structure as shown in FIG. 9 can be considered. A screw 8 is screwed into the screw hole 5 provided in the carriage body 9, and the pivot sleeve 4 is pressed at the tip of the screw 8 to fasten the carriage body 9 and the pivot sleeve 4. According to the present fastening structure, the deformation mode in which the carriage body 9 is crushed into an elliptical shape, which is a problem in the carriage bending mode, is prevented, and the primary resonance frequency of the carriage is greatly improved.

However, although the present fastening structure has excellent vibration characteristics as described above, it has the following major problems. The pivot bearing 1 is composed of a pivot shaft 2 and a pivot sleeve 4 having substantially the same coefficient of thermal expansion as the bearing 3 material, but the carriage 6 is generally made of an aluminum alloy having a significantly different coefficient of thermal expansion. Accordingly, as shown in FIG. 9, if the carriage body 9 and the pivot sleeve 4 are structured to be rigidly fastened at all points over almost the entire circumference,
Due to the temperature change of the disk device which greatly changes depending on the use environment and the operation state, a difference in the amount of thermal deformation between the carriage 6 and the pivot sleeve 4 occurs. This difference in the amount of thermal deformation causes a plurality of magnetic heads attached to the tip of the carriage arm to be displaced in the magnetic recording track width direction. The increase in the relative displacement between the individual magnetic heads increases the time required for the head change operation, and the performance of the magnetic disk drive is greatly deteriorated. Further, since this difference in the amount of thermal deformation also occurs in the screw 8 tightening portion, the pressing force due to the screw 8 tightening decreases or increases. If it decreases, the fastening force between the carriage body 9 and the pivot sleeve 4 also decreases at the same time, causing a magnetic head positioning function failure due to a decrease in the primary resonance frequency of the carriage. However, a displacement occurs with respect to the pivot sleeve 4, and it becomes impossible to secure a predetermined impact resistance. If it increases, the increase in the pressing force of the screw 8 causes the outer sleeve of the bearing 3 inside the pivot sleeve 4 to deform, causing the ball of the bearing 3 to deform, causing a magnetic head positioning function failure due to an increase in rolling frictional force.

An object of the present invention is to provide a fastening structure between the carriage body 9 and the pivot sleeve 4 in which the primary resonance frequency of the carriage is improved without causing the above-mentioned problems due to thermal deformation, and a magnetic disk drive. To achieve a higher recording density.

[0016]

According to a first aspect of the present invention, a magnetic disk for recording information is provided.
A spindle motor that rotates the magnetic disk, a magnetic head that records information on or reproduces information from the magnetic disk, and a carriage that supports the magnetic head movably in a substantially radial direction of the magnetic disk And a pivot bearing which rotatably supports the carriage body, which is fastened by a pivot shaft, a bearing, and a pivot sleeve; a VCM coil fixed to the carriage, which rotationally drives the carriage; and a magnetic field applied to the VCM coil. In a magnetic disk drive comprising a magnetic circuit to be provided, the spindle motor, the pivot bearing, a base for supporting the magnetic circuit, and a cover for sealingly covering the above-mentioned members, elastic fastening by at least one spring member And at least one rigid fastening And was thus a structure for fastening the carriage body and said pivot sleeve.

According to a second aspect of the present invention, in the magnetic disk drive according to the first aspect of the present invention, a screw is screwed from the carriage body to a flanged nut supported by a flange via the spring member. By pressing the pivot sleeve, the spring member is bent to perform the elastic fastening, and the pivot sleeve is pressed against the carriage body to be rigidly fastened by the pressing force for tightening the screw.

According to a third aspect, in the magnetic disk drive according to the first aspect, the spring member disposed between the screw that can be screwed into the carriage body and the pivot sleeve is tightened by tightening the screw. The pivot sleeve is pressed against the carriage body to be rigidly fixed by pressing the pivot sleeve against the carriage body by a pressing force for tightening the screw.

According to a fourth aspect of the present invention, in the magnetic disk drive according to the first aspect of the present invention, the rigid fixing is performed by tightening a screw from a through hole of the carriage body to a screw hole provided in the pivot sleeve and pulling the screw. The elastic member is configured to be elastically fastened by being sandwiched between the pivot sleeve and the carriage body while the spring member is bent.

According to a fifth aspect of the present invention, in the magnetic disk drive according to the first aspect, the elastic member is clamped between the pivot sleeve and the carriage body in a state where the spring member is deflected, and the elastic fastening is performed. The carriage body and the pivot sleeve are fixed to each other with an adhesive, so that the rigid fixing is performed.

According to a sixth aspect of the present invention, in the magnetic disk drive according to the first aspect of the present invention, the elastic fastening is performed by being sandwiched between the pivot sleeve and the carriage body while the spring member is bent. The pivot sleeve is pressed against the carriage body by the spring force of the spring member, whereby the rigid fastening is performed.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a magnetic disk drive actuator showing a first embodiment of the present invention. A magnetic head 10 for recording and reproducing information on a magnetic disk (not shown) is fixed to a carriage arm 12 via a suspension 11. With the pivot bearing 1 and the carriage 6, which are fastened by the pivot shaft 2, the bearing 3, and the pivot sleeve 4, the carriage body 9 and the pivot sleeve 4 are fastened, and the actuator rotates. The VCM coil 13 is fixed to the carriage 6 with an adhesive or the like (not shown) at the pair of carriage bobbins 14 and generates a rotational driving force of the carriage 6 through an electric current in a magnetic circuit (not shown). The magnetic head 10 is positioned on a predetermined track by such an actuator mechanism, and information is recorded and reproduced.

FIG. 2 is an explanatory view of a fastening structure of a carriage body and a pivot sleeve according to a first embodiment of the present invention.

The screw 8 is fastened to a flanged nut 19 supported by a flange portion 18 with a flat spring 17 interposed between the carriage body 9 and the pivot sleeve 4 is pressed with the tip of the screw 8 to thereby pivot the sleeve. 4 is elastically fastened to the carriage body 9 in the screw tightening direction, that is, in the elastic bending direction of the flat spring 17.

On the other hand, on the side opposite to the screw 8, the pivot sleeve 4 is pressed against the carriage body 9 by the tightening axial force of the screw 8, and the pivot sleeve 4 and the carriage body 9
Rigidly fastened at points.

The fastening portion between the pivot sleeve 4 and the carriage body 9 is only the screw 8 tightening portion in the prior art shown in FIG. 7. Deformation of the substantially circular carriage body 9 into an elliptical shape can be suppressed. Accordingly, the substantially circular carriage body 9 as shown in FIG. 8 is deformed into an elliptical shape, and the primary resonance vibration frequency at which the carriage 6 is deformed in a bow shape can be improved, that is, the servo band can be improved, and the magnetic head positioning accuracy can be improved. And the recording density of the magnetic disk device can be increased.

Further, since the present fastening structure includes an elastic fastening structure, the elastic characteristic of the flat spring 17 absorbs the difference in the amount of thermal deformation caused by the temperature change between the carriage body 9 and the pivot sleeve 4 and the magnetic head. The performance is degraded due to an increase in the relative thermal displacement between them, and the primary resonance frequency is lowered due to a decrease in the fastening force between the carriage body 9 and the pivot sleeve 4, thereby causing a magnetic head positioning function failure or an external influence. When the impact is applied, the carriage body 9 and the pivot sleeve 4 are easily displaced and the impact resistance is reduced, and the fastening force between the carriage body 9 and the pivot sleeve 4 is increased, so that the pivot sleeve 4 is deformed. This prevents the rolling frictional force of the ball from increasing and the magnetic head positioning trouble from occurring.

Not only in this embodiment, but also the number of fastening parts between the carriage body 9 and the pivot sleeve 4, the fastening position in the circumferential direction of the pivot sleeve 4, and the fastening position in the rotation axis direction of the carriage 6. Is rigid fastening,
The same effect can be obtained arbitrarily regardless of the elastic fastening.

FIG. 3 shows a fastening structure between a carriage body and a pivot sleeve according to a second embodiment of the present invention. The pivot sleeve 4 is pressed against the carriage body 9 in a screw tightening direction, that is, a flat spring, by pressing a flat spring 17 disposed between the screw 8 which can be tightened to the carriage body 9 and the pivot sleeve 4 by tightening the screw 8. 1
7 is elastically fastened in the elastic bending direction.

On the other hand, on the side opposite to the screw 8, the pivot sleeve 4 is pressed against the carriage body 9 by the tightening axial force of the screw 8, and the pivot sleeve 4 and the carriage body 9
Rigidly fastened at points.

The fastening portion between the pivot sleeve 4 and the carriage body 9 is only the screw tightening portion in the prior art shown in FIG. 7, but it is also fastened almost on the opposite side of the screw 8 tightening portion by this structure. The deformation of the circular carriage body 9 into an elliptical shape can be suppressed. Accordingly, the substantially circular carriage body 9 as shown in FIG. 8 is deformed into an elliptical shape, and the primary resonance vibration frequency at which the carriage 6 is deformed in a bow shape can be improved, that is, the servo band can be improved, and the magnetic head positioning accuracy can be improved. And the recording density of the magnetic disk device can be increased.

Further, since the present fastening structure includes an elastic fastening structure, the elastic characteristic of the flat spring 17 absorbs the difference in the amount of thermal deformation caused by the temperature change between the carriage body 9 and the pivot sleeve 4 and the magnetic head. The performance is degraded due to an increase in the relative thermal displacement between them, and the primary resonance frequency is lowered due to a decrease in the fastening force between the carriage body 9 and the pivot sleeve 4, thereby causing a magnetic head positioning function failure or an external influence. When the impact is applied, the carriage body 9 and the pivot sleeve 4 are easily displaced and the impact resistance is reduced, and the fastening force between the carriage body 9 and the pivot sleeve 4 is increased, so that the pivot sleeve 4 is deformed. This prevents the rolling frictional force of the ball from increasing and the magnetic head positioning trouble from occurring.

This embodiment does not require a nut with a flange like the first embodiment shown in FIG. 2 and can achieve the same effect by reducing the number of parts.

FIG. 4 shows a fastening structure between a carriage body and a pivot sleeve according to a third embodiment of the present invention. On the right side in the figure, screw holes 5 provided in the pivot sleeve 4
The pivot sleeve 4 and the carriage body 9 are rigidly fastened at two places by tightening the screws 8 from the through holes 7 of the carriage body 9 and pulling them, and the leaf spring 15 is bent on the left side in the figure. The pivot sleeve 4 and the carriage body 9 are elastically fastened by being sandwiched between the pivot sleeve 4 and the carriage body 9.

The fastening portion between the pivot sleeve 4 and the carriage body 9 is only the screw fastening portion in the prior art shown in FIG. The deformation of the circular carriage body 9 into an elliptical shape can be suppressed. Accordingly, the substantially circular carriage body 9 as shown in FIG. 8 is deformed into an elliptical shape, and the primary resonance vibration frequency at which the carriage 6 is deformed in a bow shape can be improved, that is, the servo band can be improved, and the magnetic head positioning accuracy can be improved. And the recording density of the magnetic disk device can be increased.

Further, since the present fastening structure includes an elastic fastening structure, a difference in the amount of thermal deformation caused by a temperature change between the carriage body 9 and the pivot sleeve 4 is absorbed by the elastic characteristic of the leaf spring 15, and the magnetic head is provided. The performance is degraded due to an increase in the relative thermal displacement between them, and the primary resonance frequency is lowered due to a decrease in the fastening force between the carriage body 9 and the pivot sleeve 4, thereby causing a magnetic head positioning function failure or an external influence. When the impact is applied, the carriage body 9 and the pivot sleeve 4 are easily displaced and the impact resistance is reduced, and the fastening force between the carriage body 9 and the pivot sleeve 4 is increased, so that the pivot sleeve 4 is deformed. This prevents the rolling frictional force of the ball from increasing and the magnetic head positioning trouble from occurring.

In addition to the embodiment, the leaf spring 15 does not necessarily need to be pinched in a deflected state, and a leaf spring having a dimension substantially equal to the gap between the pivot sleeve 4 and the carriage body 9 is inserted. The leaf spring 15 and the carriage body 9 and the leaf spring 15 and the pivot sleeve 4 may be bonded and fixed or screwed and fixed. In this case, since the bending force of the leaf spring 15 is not applied and the pivot sleeve 4 is not deformed, the bending rigidity of the leaf spring 15 can be set higher, so that the carriage body can be further suppressed from being deformed into an elliptical shape. Become. Therefore, the substantially circular carriage body 9 as shown in FIG. 8 is deformed into an elliptical shape, and the primary resonance vibration frequency at which the carriage 6 is deformed in an arc can be further improved, that is, the servo band can be improved. The accuracy is further improved, and a higher recording density of the magnetic disk device can be realized.

In the present embodiment, a similar effect can be obtained as a structure in which a spring member is disposed at a portion other than the screw tightening portion and elastically fastens, instead of the screw tightening portion as in the first embodiment shown in FIG. This is an example that can be performed.

FIG. 5 shows a fastening structure between a carriage body and a pivot sleeve according to a fourth embodiment of the present invention. With the leaf spring 15 bent, the pivot sleeve 4
The pivot sleeve 4 and the carriage body 9 are elastically fastened at four places by being sandwiched between the carriage body 9 and the carriage body 9, and the carriage body 9 and the pivot sleeve 4 are fixed at approximately opposite sides with an adhesive 16 so as to be rigid. The structure was fixed and fastened. The fastening between the pivot sleeve 4 and the carriage body 9 is screwed in the prior art shown in FIG. As a result, bearing ball deformation does not occur, ball rolling frictional force is reduced, and magnetic head positioning accuracy is improved. Further, since the pivot sleeve 4 and the carriage body 9 are fastened on the substantially opposite side of the rigid bonding, the deformation of the substantially circular carriage body 9 into an elliptical shape can be suppressed. Therefore, the substantially circular carriage body 9 as shown in FIG.
The next resonance vibration frequency can be improved, that is, the servo band can be improved, the positioning accuracy of the magnetic head can be improved, and the high recording density of the magnetic disk device can be realized.

Further, since the present fastening structure includes an elastic fastening structure, the elastic characteristic of the leaf spring 15 absorbs the difference in the amount of thermal deformation caused by the temperature change between the carriage body 9 and the pivot sleeve 4, and the magnetic head The performance is degraded due to an increase in the relative thermal displacement between them, and the primary resonance frequency is lowered due to a decrease in the fastening force between the carriage body 9 and the pivot sleeve 4, thereby causing a magnetic head positioning function failure or an external influence. When the impact is applied, the carriage body 9 and the pivot sleeve 4 are easily displaced and the impact resistance is reduced, and the fastening force between the carriage body 9 and the pivot sleeve 4 is increased, so that the pivot sleeve 4 is deformed. This prevents the rolling frictional force of the ball from increasing and the magnetic head positioning trouble from occurring.

The present embodiment has a structure in which rigid fixing is performed by bonding instead of rigidly fixing by screwing in the third embodiment shown in FIG. 4, and as described above, the load on the bearing due to screwing is increased. This is an embodiment in which the positioning accuracy can be further improved without any.

FIG. 6 shows a fastening structure between a carriage body and a pivot sleeve according to a fifth embodiment of the present invention. With the leaf spring 15 bent, the pivot sleeve 4
And the carriage body 9, the pivot sleeve 4 is elastically fastened to the carriage body 9 at four points, and the pivot sleeve 4 is pressed against the carriage body 9 only by the spring force of the leaf spring 15. Rigidly fixed at two places.

The fastening between the pivot sleeve 4 and the carriage body 9 is screw fastening in the prior art shown in FIG. 7, but with this structure the screw fastening rigid fastening portion is rigidly fastened by the pressing force of the leaf spring 15. As a result, since the deformation of the pivot sleeve 4 due to the screw tightening is eliminated, no bearing ball deformation occurs, the ball rolling frictional force is reduced, and the magnetic head positioning accuracy is improved. Furthermore, since the pivot sleeve 4 and the carriage body 9 are fastened by the leaf spring 15 even at a part other than the pressing rigidity, it is possible to prevent the substantially circular carriage body 9 from being deformed into an elliptical shape. Therefore, the substantially circular carriage body 9 as shown in FIG.
The next resonance vibration frequency can be improved, that is, the servo band can be improved, the positioning accuracy of the magnetic head can be improved, and the high recording density of the magnetic disk device can be realized.

Further, since the present fastening structure includes an elastic fastening structure, a difference in the amount of thermal deformation caused by a temperature change between the carriage body 9 and the pivot sleeve 4 is absorbed by the elastic characteristics of the leaf spring 15, and the magnetic head The performance is degraded due to an increase in the relative thermal displacement between them, and the primary resonance frequency is lowered due to a decrease in the fastening force between the carriage body 9 and the pivot sleeve 4, thereby causing a magnetic head positioning function failure or an external influence. When the impact is applied, the carriage body 9 and the pivot sleeve 4 are easily displaced and the impact resistance is reduced, and the fastening force between the carriage body 9 and the pivot sleeve 4 is increased, so that the pivot sleeve 4 is deformed. This prevents the rolling frictional force of the ball from increasing and the magnetic head positioning trouble from occurring.

In this embodiment, the fourth embodiment shown in FIG. 5 is rigidly fixed and fastened by bonding, whereas the fourth embodiment shown in FIG. This is an embodiment in which the same effects as in the fourth embodiment can be obtained as described above without the need for.

[0046]

As described above, according to the present invention, it is possible to increase the rigidity of the carriage body so that the pivot sleeve and the carriage body can be fastened.
The next resonance frequency is greatly improved. Accordingly, the positioning accuracy of the magnetic head can be easily increased, and the recording density of the magnetic disk device can be increased.

Further, according to the present invention, it is possible to increase the recording density without deteriorating the device performance, obstructing the positioning of the magnetic head, and deteriorating the impact resistance due to thermal deformation.

[0048]

[Brief description of the drawings]

FIG. 1 is a schematic view of an actuator of a magnetic disk drive showing a first embodiment of the present invention.

FIG. 2 is an explanatory view of a fastening structure of a carriage body and a pivot sleeve according to the first embodiment of the present invention.

FIG. 3 is an explanatory view of a fastening structure between a carriage body and a pivot sleeve according to a second embodiment of the present invention.

FIG. 4 is an explanatory view of a fastening structure between a carriage body and a pivot sleeve, showing a third embodiment of the present invention.

FIG. 5 is an explanatory view of a fastening structure of a carriage body and a pivot sleeve according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory view of a fastening structure of a carriage body and a pivot sleeve, showing a fifth embodiment of the present invention.

FIG. 7 is an explanatory view of a fastening structure between a carriage body and a pivot sleeve according to a conventional technique.

FIG. 8 is an explanatory diagram of a vibration mode of a primary resonance vibration of a magnetic disk device actuator according to a conventional technique.

FIG. 9 is an explanatory view of a fastening structure between a carriage body and a pivot sleeve for suppressing deformation of the carriage body.

[Explanation of symbols]

1 ... Pivot bearing, 2 ... Pivot shaft, 3 ...
Bearing, 4 ... pivot sleeve, 5 ... screw hole, 6 ...
Carriage, 7: Through hole, 8: Screw, 9: Carriage body, 10: Magnetic head, 11: Suspension, 12 ...
Carriage arm, 13: VCM coil, 14: carriage bobbin, 15: leaf spring, 16: adhesive, 17: flat spring, 18: flange portion, 19: nut with flange.

Claims (6)

[Claims] A magnetic disk for recording information; a spindle motor for rotating the magnetic disk; a magnetic head for recording information on or reproducing information from the magnetic disk; A carriage that movably supports the magnetic disk in a substantially radial direction, a pivot bearing that rotatably supports the carriage body, a pivot shaft, a bearing, and a pivot sleeve; a pivot bearing that is fixed to the carriage and rotates the carriage. A magnetic disk comprising a VCM coil to be driven, a magnetic circuit for applying a magnetic field to the VCM coil, a base for supporting the spindle motor, the pivot bearing, and the magnetic circuit, and a cover for sealingly covering the above members. In the device, at least one spring member And elastic fastening, by a rigid fixed fastening of at least one position, the magnetic disk device being characterized in that the structure for fastening the carriage body and said pivot sleeve. 2. The magnetic disk drive according to claim 1, wherein a screw is screwed from the carriage body to a flanged nut supported by a flange via the spring member, and a tip of the screw is connected to the pivot sleeve. A magnetic disk drive characterized in that the spring member is deflected by pressing the spring sleeve to perform the elastic fastening, and the pivot sleeve is pressed against the carriage body to be rigidly fastened by a pressing force for tightening the screw. 3. The magnetic disk drive according to claim 1, wherein the spring member disposed between the screw that can be screwed into the carriage body and the pivot sleeve is pressed by tightening the screw. The magnetic disk drive, wherein the pivot sleeve is pressed against the carriage body by a pressing force for tightening the screw and rigidly fixed. 4. The magnetic disk drive according to claim 1, wherein the rigid fixing is performed by tightening a screw from a through hole of the carriage body to a screw hole provided in the pivot sleeve and pulling the screw. The magnetic disk drive according to claim 1, wherein the elastic disk is elastically fastened by being sandwiched between the pivot sleeve and the carriage body in a bent state. 5. The magnetic disk drive according to claim 1, wherein the elastic member is elastically fastened by being sandwiched between the pivot sleeve and the carriage body while the spring member is bent. A magnetic disk drive, wherein the pivot sleeve is rigidly fastened by fixing the pivot sleeve with an adhesive. 6. The magnetic disk drive according to claim 1, wherein the elastic member is elastically fastened by being sandwiched between the pivot sleeve and the carriage body in a state where the spring member is deflected. The pivot sleeve is moved by the spring force.
The magnetic disk device, wherein the rigid fixing is performed by pressing against the carriage body.