Suspension for disk device

Abstract

To provide a suspension for a disk device capable of suppressing interference between a disk and a slider.SOLUTION: A suspension 10 includes a load beam 20 having a dimple portion 50 and a flexure 21 having a slider mounting portion 30. The dimple portion 50 has a convex surface 51 that contacts the slider mounting portion 30. The slider mounting portion 30 is swingably supported by a gimbal component member 40. A curvature radius R of the convex surface 51 is less than 0.15 mm. A flexure pitching resistance Fpr acting on a contact portion 90 when the slider mounting portion 30 swings in a pitching direction is 0.005 N or less. A phase delay in the pitching direction on the slider mounting portion 30 for the waviness of a rotating disk 12 is 20° or less.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a suspension for a disk drive having a swingable slider mounting portion on which a slider is mounted. [Background technology]

[0002] Hard disk drives (HDDs) are used in information processing devices such as personal computers. Hard disk drives include a magnetic disk that rotates around a spindle and a carriage that rotates around a pivot shaft. The carriage has an arm portion, and rotates around the pivot shaft by a positioning motor such as a voice coil motor.

[0003] A suspension for a disk drive (hereinafter referred to as the suspension) is attached to the arm of the carriage. The suspension includes a load beam and a flexure arranged along the load beam. A slider is mounted on a slider mounting portion formed near the tip of the flexure. In the industry, the slider mounting portion is sometimes called a tongue.

[0004] The load beam, flexure, slider, etc. constitute a gimbal assembly. The slider is provided with an element for accessing the disk, such as reading or writing data. When the disk drive is in use, data is accessed from the recording surface of the disk by the element of the slider while the disk is rotating.

[0005] For example, as described in Patent Documents 1 and 2, in a suspension having a slider mounting portion, the convex surface of the dimple portion is in contact with the slider mounting portion. The dimple portion is provided on a load beam. The slider mounting portion is elastically supported by gimbal components such as outriggers, and swings around the convex surface of the dimple portion.

[0006] As the disk rotates, air flows between the leading end of the slider and the trailing end of the slider, forming an air bearing. As used herein, "leading side" refers to the side where air enters between the slider and the disk as the disk rotates. "Trailing side" refers to the side where air exits.

[0007] In order to accommodate the increasing recording density of disks, the distance between the slider and the disk tends to become smaller. When the disk is rotating and the air bearing is formed, an example of the distance between the leading end of the slider and the disk is 100 nm. In contrast, an example of the distance between the trailing end and the disk is 10 nm.

[0008] Although the recording surface of a disk appears flat, in reality, there may be waviness of several microns in the circumferential direction of the disk. When the inventors of the present invention carefully examined the flatness of the disk, they found that the waviness on the outer periphery of the disk tends to be larger than the waviness near the center clamp part near the center of rotation of the disk. The slider needs to move in the pitching direction to follow the waviness of the disk.

[0009] The slider rocks relative to the load beam with the convex surface of the dimple as a fulcrum. In this specification, the behavior of the leading part of the slider moving in a direction away from or toward the load beam with respect to the longitudinal direction of the suspension is referred to as pitching. The pitch angle is the angle in the pitching direction from the reference position. In this specification, the movement of the leading part of the slider moving toward the load beam is referred to as moving in the direction of a positive pitch angle. The movement of the leading part of the slider moving away from the load beam is referred to as moving in the direction of a negative pitch angle.

[0010] When the slider travels over a crest of the disk waviness, it moves along the surface of the disk in the negative pitch direction, and when the slider travels toward a valley of the disk waviness, it moves along the surface of the disk in the positive pitch direction.

[0011] The slider is tilted at a slight positive pitch angle with respect to the disk surface. The pitch angle is generally very small, for example 0.006°. If the waviness amplitude is, for example, 3 to 6 μm, the slider must change in the pitching direction by a fairly large angle, for example ±0.03 to ±0.06°.

[0012] Recently, with the evolution of disk drives, there is a trend for the length of the suspension to become shorter. The load beam forms a certain angle in the pitching direction with respect to the surface of the disk. The slider mounting part located at the tip of the load beam moves in the pitching direction with respect to the load beam, centered on the dimple part. The shorter the suspension length, the greater the change in the angle of the slider in the pitching direction. For example, it is known that when the suspension length is close to 6 mm, the change in the angle of the slider is large. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] JP 2014-22013 A [Patent Document 2] JP 2020-140749 A Summary of the Invention [Problem to be solved by the invention]

[0014] It is known that if the slider cannot follow the waviness of the disk quickly enough, the slider will get too close to the surface of the disk, causing friction on the slider, disk, or air bearing, resulting in hot spots. In extreme cases, the slider may even come into contact with the disk, causing scratches on the disk and / or slider.

[0015] As a result of intensive research, the inventors found that there were cases where the slider got too close to the disk at points where the pitch angle changed significantly, such as near the peaks and troughs of the disk undulations, and discovered that the slider's ability to follow the disk undulations is important in order to avoid interference between the disk and the slider.

[0016] In the industry, it has been customary to consider that a slider mounting portion such as a tongue oscillates while being in contact with the convex surface of the dimple at a single point. The contact between the convex surface of the dimple and the slider mounting portion is equivalent to the contact between a spherical surface rolling on a flat surface and a flat surface, and has been considered to be Hertzian elastic contact. In Hertzian elastic contact, friction between the slider mounting portion (flat surface) and the convex surface of the dimple (spherical surface) can be substantially ignored. For this reason, it was not considered that the movement of the slider mounting portion would be affected by friction with the convex surface.

[0017] An object of one embodiment of the present invention is to provide a suspension for a disk drive that can suppress interference between a rotating disk and a slider. [Means for solving the problem]

[0018] As a result of intensive research, the inventors discovered that a force similar to friction in the opposite direction to the pitching direction occurs at the contact point between the convex surface of the dimple and the slider mounting area. The inventors named this force flexure pitching resistance (Fpr). Fpr is an abbreviation for Flexure Pitching Resistance.

[0019] The flexure pitching resistance (Fpr) occurs at the contact point between the slider mounting part and the convex surface when the slider mounting part oscillates on the convex surface of the dimple part. It was also found that this flexure pitching resistance (Fpr) causes a phase delay in the slider when the slider mounting part oscillates following the waviness of the disk. When the slider behavior following the waviness of the disk was studied, it was found that interference between the disk and the slider can be suppressed if the phase delay in the pitching direction of the slider with respect to the waviness period is 20° or less, preferably 15° or less.

[0020] A suspension for a disk drive according to a first aspect includes a load beam and a flexure disposed along the load beam and having a slider mounting portion for mounting a slider. The suspension includes a dimple portion and a gimbal component. The dimple portion is formed on the load beam and has a convex surface that contacts the slider mounting portion. The gimbal component supports the slider mounting portion in contact with the convex surface so that the slider mounting portion can swing in at least the pitching direction relative to the load beam.

[0021] The radius of curvature of the convex surface is less than 0.15 mm and not less than 0.04 mm, and the phase delay of the slider mounting portion in the pitching direction relative to the waviness of the rotating disk is not more than 20°. Preferably, the radius of curvature of the convex surface is less than 0.10 mm (e.g., 0.095 mm), and the phase delay of the slider mounting portion is not more than 15°. More preferably, the radius of curvature of the convex surface is less than 0.085 mm.

[0022] The suspension according to the second aspect also includes a load beam, a flexure, a dimple portion, and a gimbal component. In this suspension, the flexure pitching resistance acting on the contact portion between the convex surface of the dimple portion and the slider mounting portion is 0.005 N or less, and the phase delay of the slider mounting portion in the pitching direction relative to the waviness of the disk is 20° or less.

[0023] In the suspension of this embodiment, preferably, the flexure pitching resistance is 0.002 N or less, and the phase lag of the slider mounting portion is 10° or less. More preferably, the flexure pitching resistance is 0.001 N or less, and the phase lag of the slider mounting portion is 5° or less. In the suspension of this embodiment, the radius of curvature of the convex surface may be less than 0.10 mm (e.g., 0.095 mm). Effect of the Invention

[0024] The suspension of the present invention can prevent the slider, which moves in the pitching direction following the undulation of the rotating disk, from interfering with the disk. [Brief description of the drawings]

[0025] [Figure 1] 1 is a top view of a portion of a suspension according to one embodiment. [Diagram 2] 2 is a cross-sectional view of a part of the suspension and the slider taken along line F2-F2 in FIG. 1. [Diagram 3] FIG. 1 is a cross-sectional view illustrating an example of a disk device. [Figure 4] FIG. 3 is a side view showing a schematic representation of a part of the suspension, a slider, and a part of the disk shown in FIG. 2; [Diagram 5] 5 is a side view showing a schematic state in which the slider shown in FIG. 4 has moved in the direction of a negative pitch angle. [Figure 6] 5 is a side view showing a schematic state in which the slider shown in FIG. 4 has moved in the direction of a positive pitch angle. [Figure 7] FIG. 5 is a schematic diagram showing the motion system of the suspension, slider, and disk shown in FIG. [Figure 8] 1 is a diagram showing the position of a disk during a waviness period and the phase delay of a slider. [Figure 9] 11 is a diagram showing the relationship between the radius of curvature of the convex surface of the dimple portion and the phase delay of the slider. [Figure 10]11 is a diagram showing the relationship between the flexure pitching resistance and the phase delay of a slider. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A suspension for a disk drive according to one embodiment will be described below with reference to the drawings. Hereinafter, the suspension for a disk drive may be simply referred to as a suspension.

[0027] Fig. 1 is a plan view showing a part of the suspension 10. Fig. 2 is a cross-sectional view of a part of the suspension 10 taken along line F2-F2 in Fig. 1. Fig. 3 is a cross-sectional view showing a schematic example of a disk device 11 having the suspension 10. The disk device 11 has one or more disks 12. The disk device 11 will be described later, and first the suspension 10 will be described.

[0028] The suspension 10 includes a load beam 20 and a flexure 21 disposed along the load beam 20. The load beam 20 is made of a stainless steel plate and extends in the longitudinal direction of the suspension 10. The direction indicated by a double-headed arrow X1 in Fig. 1 is the longitudinal direction of the load beam 20, i.e., the longitudinal direction of the suspension 10. The thickness of the load beam 20 is, for example, 20 to 40 µm, but may be any other thickness.

[0029] The flexure 21 includes a metal base 22 made of a thin plate of stainless steel, and a wiring portion 23 arranged along the metal base 22. An example of the thickness of the metal base 22 is 20 μm (12 to 25 μm). The thickness of the metal base 22 is smaller than the thickness of the load beam 20.

[0030] 1, the metal base 22 is fixed to the load beam 20 by a plurality of welds (for example, a first weld W1 and a second weld W2). The wiring portion 23 includes a base insulating layer made of an electrically insulating resin such as polyimide, a plurality of conductors formed on the base insulating layer, and a cover layer covering the conductors.

[0031] A slider mounting portion 30 is formed on a part of the metal base 22. In the industry, the slider mounting portion 30 is sometimes called a tongue. As shown in FIG. 2, the slider mounting portion 30 has a first surface 30a and a second surface 30b. The first surface 30a faces the load beam 20. The second surface 30b is opposite to the first surface 30a in the thickness direction of the metal base 22.

[0032] The slider 31 is provided on the second surface 30b of the slider mounting portion 30 with the wiring portion 23 sandwiched therebetween. A part of the slider 31 is fixed to the slider mounting portion 30 with an adhesive. The slider 31 has a leading side portion 31a and a trailing side portion 31b with respect to the rotation direction of the disk 12. In this specification, the "leading side" refers to the inflow side of air that flows between the disk 12 and the slider 31 when the disk is rotating. The "trailing side" refers to the outflow side of air.

[0033] A plurality of elements 33 capable of converting magnetic signals to electric signals, such as MR elements, are provided at the tip 32 on the trailing side of the slider 31. These elements 33 are used to access the recording surface of the disk 12, such as to write or read data. A heater 34 may be disposed near the elements 33. When the heater 34 is energized, the trailing side portion 31b is heated and expands. This makes it possible to further reduce the distance h1 (shown in FIGS. 4 to 6) between the trailing side portion 31b and the disk 12. For example, it is possible to make the distance h1 1 nm or less.

[0034] The distance h1 between the trailing side portion 31b of the slider 31 and the disk 12 is sometimes referred to as head media spacing (HMS). The distance h1 is smaller than the distance h2 between the leading side portion 31a and the disk 12. h2 is, for example, 100 nm, while h1 is, for example, 10 nm.

[0035] 1, the slider mounting portion 30 is elastically supported on the load beam 20 by first arms 41, 42 and second arms 43, 44 serving as a gimbal component 40. The first arms 41, 42 and the second arms 43, 44 are part of the metal base 22. The gimbal component 40 can vary depending on the design of the flexure 21, and is not limited to the example shown in FIG.

[0036] A gimbal portion 45 is formed in a part of the flexure 21 by the slider mounting portion 30 and the gimbal component member 40. Actuator elements 46, 47 may be disposed on both sides of the slider 31. The actuator elements 46, 47 are made of a piezoelectric material such as PZT (lead zirconate titanate), and can rotate the trailing side portion 31b of the slider 31 slightly in the width direction when a voltage is applied.

[0037] The tip ends of the first arms 41 and 42 are supported on the load beam 20 by a first welded part W1. The bases 43a and 44a of the second arms 43 and 44 are fixed to the load beam 20 by a second welded part W2. That is, the slider mounting part 30 is supported by the gimbal component 40 so as to be elastically swingable with respect to the load beam 20.

[0038] Limiter members 48, 49 may be provided between the slider mounting portion 30 and the tip end 21a of the flexure 21. The limiter members 48, 49 are made of a resin such as polyimide, and suppress excessive shaking of the slider mounting portion 30 when an external impact is applied to the suspension 10. Depending on the design of the flexure 21, the limiter members 48, 49 may function as part of the gimbal component member 40.

[0039] A dimple portion 50 is formed on the load beam 20. As shown in FIG. 2, the dimple portion 50 has a convex surface 51 that protrudes in a dome shape toward the slider mounting portion 30. The convex surface 51 has a shape obtained by rotating an arc with a radius of curvature R about a vertical axis Y, and is substantially circular in a plan view of the slider mounting portion 30. The arc with a radius of curvature R is not necessarily a perfect circle. In other words, the convex surface 51 has a shape similar to a part of a hemisphere. The tip of the convex surface 51 is in contact with the first surface 30a of the slider mounting portion 30.

[0040] 2, when the convex surface 51 of the dimple portion 50 is in contact with the slider mounting portion 30, the slider mounting portion 30 swings at least in the pitching direction (the direction indicated by the double-headed arrow P in FIG. 2). As a result, the slider mounting portion 30 generates at least a vertical displacement around the convex surface 51. The slider mounting portion 30 is supported by gimbal component members 40, such as outriggers and arms, so as to be swingable with respect to the load beam 20 at least in the pitching direction (vertical swing direction) and the rolling direction (lateral swing direction).

[0041] 3 is a cross-sectional view showing a schematic example of a disk device (HDD) 11. The disk device 11 has a disk 12 that rotates around a spindle, a case 70 (only a part of which is shown), a carriage 72 that can turn around a pivot shaft 71, and a positioning motor 73 that drives the carriage 72. The case 70 is sealed with a lid. The suspension 10 is attached to the tip of an arm portion 74 of the carriage 72.

[0042] When the carriage 72 is rotated by the positioning motor 73, the suspension 10 moves in the radial direction of the disk 12, and the slider 31 moves to a desired position on the disk 12. When the disk 12 rotates, air flows from the leading side portion 31a to the trailing side portion 31b of the slider 31, forming an air bearing 80 between the disk 12 and the slider 31.

[0043] 4 shows a schematic diagram of the surface 12a of the disk 12 along a flat reference plane N, the slider 31, and the dimple portion 50. The slider mounting portion 30 is in contact with the convex surface 51 while being elastically supported by the gimbal component member 40. Therefore, the slider mounting portion 30 and the convex surface 51 are in contact with each other at a contact portion 90.

[0044] The slider mounting portion 30 moves around the center of curvature Z1 in a rolling manner on the convex surface 51 while in contact with the convex surface 51 at the contact portion 90. At this time, the convex surface 51 and the slider mounting portion 30 are in elastic contact between a plane and a spherical surface (Hertzian elastic contact). Therefore, there is no slippage at the contact portion, and loss due to friction is considered to be substantially negligible.

[0045] However, in reality, a force similar to friction acts on the contact portion 90 between the slider mounting portion 30 and the convex surface 51. This force is the flexure pitching resistance Fpr discovered by the inventors. The flexure pitching resistance Fpr can be found by analysis according to the design of the flexure 21 (mainly the design of the gimbal portion 45).

[0046] FIG. 5 shows a schematic representation of the slider 31 following the undulation crest. The surface 12a of the disk 12 forms a negative pitch angle θ1 with respect to the reference plane N. As shown in FIG. 5, when the slider 31 follows the undulation of the disk 12, the contact portion 90 between the slider mounting portion 30 and the convex surface 51 moves from the reference line Y1 in the first direction P1. The slider mounting portion 30 rolls on the convex surface 51 without substantially slipping. At this time, a flexure pitching resistance Fpr acts on the contact portion 90 in the tangential direction of the convex surface 51 in the opposite direction to the direction in which the slider mounting portion 30 moves.

[0047] The flexure pitching resistance Fpr acts on the contact portion 90 as a moment of a curvature radius R. As a result, a torque about the center of curvature Z1, expressed as the product (Fpr×r) of the flexure pitching resistance Fpr and the curvature radius R, acts on the slider mounting portion 30. This torque increases as the curvature radius R increases, and provides resistance to the movement of the slider mounting portion 30 in the pitching direction.

[0048] 6 shows a schematic state in which the slider 31 follows swells with a positive pitch angle θ2. When the slider 31 follows swells with a positive pitch angle θ2, a contact portion 90 between the slider mounting portion 30 and the convex surface 51 moves from the reference line Y1 in a second direction P2. The slider mounting portion 30 rolls on the convex surface 51 without substantially slipping. At this time, a flexure pitching resistance Fpr acts on the contact portion 90 in the tangential direction of the convex surface 51 in the opposite direction to the direction in which the slider mounting portion 30 moves.

[0049] FIG. 7 is a diagram showing a model of a motion system including the slider 31. In FIG. 7 and the formulas shown thereafter, k1 is the pitch direction stiffness (pitch stiffness [Nm / rad]) of the slider surface 31c facing the air bearing 80. k2 is the pitch direction stiffness (pitch stiffness [Nm / rad]) of the gimbal portion 45 of the flexure 21. C is the viscous damping coefficient of the slider surface 31c facing the air bearing 80 and the gimbal portion 45. ζ is the viscous damping ratio. θ is the pitch angle [rad], a is the input amplitude [rad], Fpr is the flexure pitching resistance [N], R is the radius of curvature R [m], and ω is the circular frequency [rad / s]. I is the inertia of the slider 31 including the slider mounting portion 30, but to simplify the calculation, only the inertia of the slider 31 is considered.

[0050] Here, the equation of motion when a forced vibration of θ0 is input as the waviness of the disk 12 is I×θ”=-k1×(θ-a×sin ωt)-C×θ'-k2×θ-R×Fpr After transformation, we obtain the following Equation 1. θ”+C / I×θ'+(k1+k2) / I×θ=a×k1 / I×sin ωt-R×Fpr / I …… Formula 1

[0051]

number

[0052] (k1+k2) / I=ω0 2 , C / I=2×ζ×ω0 Therefore, Equation 1 becomes θ”+2×ζ×ω0×θ'+ω0 2 ×θ=a×k1 / I×sin ωt-R×Fpr / I …… Formula 2 It is expressed as:

[0053] The steady-state response of the equation of motion θp=U×sin ωt+V×cos ωt is expressed by the following equations 3 to 8.

[0054]

number

[0055] Using equations 3 through 8, we can calculate the slider pitch response to disk waviness. For ζ=0, we have

[0056]

number

[0057] The following can be seen from the calculation formula without viscous damping: (1) When there is a flexure pitching resistance Fpr, a phase lag δ occurs regardless of the frequency. (2) The parameters of the phase lag δ are the radius of curvature R of the dimple convex surface, the flexure pitching resistance Fpr, the input amplitude a, and the pitch stiffness k1 of the air bearing. (3) In particular, when the waviness of the disk is 10 μm or less, the input amplitude a becomes extremely small, so it can be assumed that the phase lag increases.

[0058] As described above, the flexure pitching resistance Fpr generates a friction-like force in the contact portion 90. This causes a phase delay in the slider mounting portion 30, which moves in the pitching direction following the undulation of the disk 12. The phase delay here means a position delay during a period in which one period is 360°, for a periodic phenomenon such as the undulation of the rotating disk 12. In other words, it is the phase difference between the period of the undulation of the disk 12 and the period of the motion of the slider 31 in the pitching direction.

[0059] 8 shows a schematic diagram of the relationship between the position in the undulation cycle of the disk 12 and the pitch angle of the slider 31. A phase lag (shown by dashed line L2 in FIG. 8) occurs in the slider 31 relative to the undulation cycle (shown by solid line L1 in FIG. 8). When a phase difference occurs in the slider 31 relative to the undulation of the disk 12, a delay occurs in the slider 31 following the undulation. When the phase lag of the slider becomes large, there is a possibility that the slider 31 will interfere with the disk 12.

[0060] The inventors have conducted extensive research and found that interference occurs when the slider approaches the disk excessively close to the disk at locations where the pitch angle of the undulations changes significantly, such as near the peaks of the disk undulations or near the bottoms of the disk undulations. It has also been found that in order to suppress such interference, it is effective to set the phase delay of the slider in the pitching direction, which follows the undulations of the rotating disk, to 20° or less, preferably 15° or less. In order to prevent interference between the disk and the slider, it is recommended that the phase delay of the slider relative to the undulation period be 20° or less, preferably 15° or less.

[0061] 9 is a diagram showing the relationship between the radius of curvature R of the convex surface 51 and the phase delay of the slider 31. Here, the parameters are as follows: I = 3.15E-14 [kg m 2 ], a = 5.24E-4 [rad] (approximate value 0.03 deg), R = 2.5E-4 [m] (0.25 mm), k1 = 8.0E-3 [Nm / rad], k2 = 7.2E-6 [Nm / rad], Fpr = 0.01 [N] (approximate value 1 gf), ζ = 0.02 If the radius of curvature R of the convex surface 51 is less than 0.15 mm, the phase lag can be made smaller than 20°. However, due to limitations of the mold used to form the dimple portion 50, it is practically difficult to make the radius of curvature R smaller than 0.04 mm. Therefore, the radius of curvature R is set to less than 0.15 mm and not less than 0.04 mm. The height h3 of the dimple portion (shown in FIG. 4) is, for example, 0.04 mm to 0.07 mm, but may be any other height.

[0062] If the curvature radius R of the convex surface 51 is less than 0.10 mm, the phase delay of the slider 31 is 15° or less, which is more effective in suppressing interference with the disk. If the curvature radius R of the convex surface 51 is less than 0.085 mm, the phase delay can be reduced to nearly 10°.

[0063] Fig. 10 shows the relationship between the flexure pitching resistance (Fpr) and the phase delay of the slider. If the flexure pitching resistance (Fpr) is 0.005N or less, the phase delay of the slider following the waviness of the disk can be set to 20° or less. More preferably, the flexure pitching resistance (Fpr) is set to 0.002N or less, and the phase delay of the slider is set to 10° or less.

[0064] Preferably, the flexure pitching resistance (Fpr) is set to 0.001 N or less, and the phase delay of the slider is set to 5° or less. In a suspension with a flexure pitching resistance (Fpr) of 0.005 N or less, the curvature radius R of the convex surface 51 may be less than 0.10 mm.

[0065] In implementing the present invention, it goes without saying that the components constituting the suspension can be modified in various ways, including the specific aspects of the load beam, flexure, slider, and dimple shape and position, etc. The disk device is also not limited to the above embodiment, and can take various forms as necessary. [Explanation of symbols]

[0066] 10...suspension, 11...disk device, 12...disk, 20...load beam, 21...flexure, 22...metal base, 30...slider mounting portion, 31...slider, 31a...leading side portion, 31b...trailing side portion, 40...gimbal component, 45...gimbal portion, 50...dimple portion, 51...convex surface, 80...air bearing, 90...contact portion, R...radius of curvature, Z1...center of curvature, Fpr...flexure pitching resistance.

Claims

1. A load beam; a flexure disposed along the load beam and having a slider mounting portion for mounting a slider; A suspension for a disk drive comprising: a dimple portion formed on the load beam and having a convex surface that comes into contact with the slider mounting portion; a gimbal component member that supports the slider mounting portion in contact with the convex surface so as to be swingable at least in the pitching direction, The radius of curvature of the convex surface is less than 0.15 mm and is 0.04 mm or more; A suspension, wherein a phase delay in the pitching direction of the slider mounting portion with respect to undulations of a rotating disk is 20° or less.

2. 2. The suspension of claim 1, The radius of curvature of the convex surface is less than 0.10 mm; The phase delay of the slider mounting portion is 15° or less.

3. 2. The suspension of claim 1, The radius of curvature of the convex surface is less than 0.085 mm; The phase delay of the slider mounting portion is 15° or less.

4. A load beam; a flexure disposed along the load beam and having a slider mounting portion for mounting a slider; A suspension for a disk drive comprising: a dimple portion formed on the load beam and having a convex surface that comes into contact with the slider mounting portion; a gimbal component member that supports the slider mounting portion in contact with the convex surface so as to be swingable at least in the pitching direction, a flexure pitching resistance acting on a contact portion between the slider mounting portion and the convex surface when the slider mounting portion moves in the pitching direction is 0.005 N or less; A suspension, wherein a phase delay in the pitching direction of the slider mounting portion with respect to undulations of a rotating disk is 20° or less.

5. 5. The suspension according to claim 4, The flexure pitching resistance is 0.002 N or less, The phase delay of the slider mounting portion is 10° or less.

6. 5. The suspension according to claim 4, The flexure pitching resistance is 0.001 N or less, The phase delay of the slider mounting portion is 5° or less.

7. 5. The suspension according to claim 4, A suspension, wherein the convex surface has a radius of curvature of less than 0.10 mm.

Images