CN1956061A - Suspension, magnetic head gimbal assembly containing the suspension, and disk drive unit - Google Patents

Abstract

A cantilever part used for magnetic head folding piece combination comprises a flexible part, wherein one end of the flexible part is provided with a plurality of connecting contacts used for connecting with a control system, and the other end of the flexible part is provided with a plurality of cables. The flexure further includes: a tongue for carrying a magnetic head; a suspending portion for suspending the tongue piece from the flexure. Wherein the width of the suspension part is smaller than that of the tongue piece. The invention also discloses a magnetic head folding piece combination containing the cantilever piece and a disk drive unit containing the magnetic head folding piece combination.

Description

Suspension, magnetic head gimbal assembly containing the suspension, and disk drive unit

technical field

The present invention relates to a disk drive unit, in particular to a head gimbal assembly (head gimbal assembly, HGA) having a suspension with optimized stiffness; the present invention also relates to a head gimbal assembly comprising a suspension, the The boom has a trace support bridge for supporting a plurality of cables on the boom.

Background technique

A common type of information storage device is a disk drive system that uses magnetic media to store data. Consumers have always expected increasing storage capacity from such disk drive systems, while at the same time expecting faster and more accurate read and write speeds. Therefore, magnetic disk manufacturers have been working on developing magnetic disk systems with higher storage capacity, such as increasing the density of magnetic tracks by reducing the track width or track pitch on the magnetic disk. However, as the track density increases, the accuracy of the position control of the read/write head must also be correspondingly improved in order to achieve faster and more accurate read and write operations in high-density magnetic disks. As track density increases, it becomes more difficult to achieve faster and more precise positioning of the read/write head on the proper track on the disk using traditional techniques. As a result, disk manufacturers are constantly looking for ways to increase control over the position of the read/write head in order to take advantage of the benefits of increasing track densities.

As a means of improving head position control, many dual-drive systems have been developed in the past to increase access speed and positioning accuracy of the head on the proper track on a high-density disk. This dual-driver system usually includes a main voice-coil motor actuator (VCM) and a secondary micro-driver, such as a PZT element micro-driver (ie, a piezoelectric element micro-driver). The voice coil motor drive is controlled by a servo control system that causes the rotation of the drive arm carrying the read/write head for positioning the read/write head on the appropriate track on the storage disk. The PZT component micro-driver is used in conjunction with the voice coil motor driver to improve the access speed and realize the fine adjustment of the position of the read-write head on the magnetic track. The voice coil motor driver is used for coarse adjustment of the position of the read-write head, while the PZT element micro-driver is used for fine adjustment of the position of the read-write head relative to the disk. Through the cooperation of the two drives, the efficient and accurate read and write operations of data on the storage disk are jointly realized.

Figure 1a shows a typical disk drive system with a head displacement control system. FIG. 1 a shows a portion of a conventional disk drive unit, with a disk 101 mounted on and rotated by a spin motor 102 . A HGA 100 is carried on the VCM arm 104 , and the HGA 100 includes a micro-driver 105 and a read/write head 103 . A voice coil motor controls the movement of the voice coil motor arm 104 , and then controls the movement of the magnetic head 103 between the magnetic tracks on the surface of the magnetic disk 101 , and finally realizes the reading and writing of data on the magnetic disk 101 by the read/write head. In the working state, an aerodynamic contact is formed between the magnetic head 103 including the read-write head and the rotating magnetic disk 101, and a lift force is generated. This lift force is counterbalanced by equal and opposite elastic forces exerted by the suspension members of the HGA 100, resulting in the formation and maintenance of a predetermined flight over the surface of the rotating magnetic disk 101 during the full range of rotation of the motor arm 104. high.

FIG. 1b shows the HGA 100 of the disk drive unit with dual drives in FIG. 1a. However, due to the inherent error of the combination of the voice coil motor and the head suspension, the magnetic head 103 cannot achieve fast and precise position control, thereby affecting the performance of the read-write head to accurately read and write data on the disk. For this reason, the above-mentioned PZT element micro-driver 105 is added to improve the position control accuracy of the magnetic head and the read/write head. More specifically, compared with the voice coil motor driver, the PZT element micro-driver adjusts the displacement of the magnetic head 103 in a smaller range, so as to compensate the resonance error of the voice coil motor and/or head suspension combination. The PZT element micro-driver makes it possible to apply a smaller track pitch, and can increase the track density (TPI, the number of tracks per inch) of the disk drive unit by 50%, while reducing the positioning time of the magnetic head. Therefore, the PZT element microdrive can greatly increase the surface recording density of the information storage disk.

Referring to FIGS. 1a and 1b , one known microactuator is a U-shaped microactuator 105 . The U-shaped microdrive 105 includes two side arms 107 holding the magnetic head 103 therein. The magnetic head 103 is displaced by the movement of the arm 107 . The PZT element micro-driver 105 can correct the displacement of the magnetic head 103 in a smaller range, because the PZT element is installed on the side arm 107, and the voltage from the control system will deform the PZT element, thereby adjusting the position of the magnetic head.

Referring further to FIG. 1 c , a conventional PZT element micro-actuator 105 includes a U-shaped ceramic frame with two ceramic side arms 107 , wherein a piezoelectric element is mounted on each side arm. Referring to FIGS. 1b-1c , the PZT element microactuator 105 is physically mounted on a flexure 114 . Three electrical connection balls 109 (gold ball bonding or solder ball bonding, gold ball bonding or solder ball bonding, GBB or SBB) fix the PZT element micro-driver 105 on the inner cantilever cable 910 located on both sides of the above-mentioned side arm 107. In addition, four metal balls 108 (GBB or SBB) mount the magnetic head 103 to the suspension cable 110 .

FIG. 1d schematically illustrates an exemplary process for assembling the magnetic head 103 to the microdrive 105 . As shown in FIG. 1d, the magnetic head 103 is partially connected to two predetermined positions 106 on the two side arms 107 by epoxy glue. This connection makes the movement of the magnetic head 103 dependent on the movement of the arm 107 of the PZT element micro-drive 105 . A piezoelectric element 116 is mounted on each side arm 107 of the micro-driver, so that the magnetic head 103 can move controllably by exciting the piezoelectric element. When a voltage is applied through the suspension cable 910, the PZT element expands or contracts causing deformation of the arms 107 of the U-shaped micro-actuator frame, thus causing the magnetic head 103 to move on the magnetic track of the disk for fine alignment of the read/write head s position. In this way, a controllable displacement of the magnetic head 103 can be realized, so as to realize fine adjustment of the position.

In the information technology industry, it is well known that with the rapid increase in the capacity of hard disk drives, the actual sales price of hard disk drives is getting lower and lower. In order to cater to the market, manufacturers have been developing methods that can reduce material costs. A typical example is Make the magnetic head smaller and smaller, for example, from a 100% magnetic head to a 50% magnetic head, the current magnetic head is a 30% magnetic head. At the same time, the industry is more interested in 20%-sized heads. As the size of the head decreases, the size of the air bearing surface side is also reduced, while the demand for higher storage capacity hard drives forces the flying height of the head to continue to decrease. , which is a great challenge to the shape of the air bearing surface of the magnetic head and the static parameter design of the suspension such as stiffness. Due to the limitations of the air bearing surface design, the suspension needs to have less and less stiffness, especially when using micro-actuators, the design of the suspension is becoming more and more difficult, so methods and optimizations suitable for small size magnetic heads are required design.

Therefore, it is necessary to provide a suspension with optimized stiffness, a HGA and a disk drive unit including the suspension, so as to overcome the deficiencies in the prior art.

Contents of the invention

One aspect of the present invention is to provide a suspension with optimized stiffness, so that the magnetic head mounted on the suspension has good flight stability and resonance performance.

Another aspect of the present invention is to provide a head gimbal assembly with optimized stiffness, so that the head has good flying stability and resonance performance.

Yet another aspect of the present invention is to provide a disk drive unit with larger servo bandwidth and capacity.

In order to achieve the above object, a suspension member used for HGA assembly in the present invention includes a flexible member, and one end of the flexible member has a plurality of connection contacts, so as to connect the flexible member with the control system, and the flexible member The other end of the has multiple cables. The flexible part also includes a tongue for holding the magnetic head and a suspending part suspending the tongue from the flexible part, wherein the width of the suspending part is smaller than that of the tongue. In the present invention, the flexible member further includes a top support bar connected to the middle area of the suspension part and two side support bars connected to two ends of the top support bar. In one embodiment, the width of the top support bar is greater than 0.085mm. The width of the side support bar is greater than 0.10 mm. The width of the suspension part is between 0.5-0.9 mm.

In the present invention, the suspension member further includes a load bar having a small protrusion for supporting the tongue. As an embodiment of the present invention, the small protrusion is located on the connecting edge between the suspension part and the tongue. In another embodiment, the small protrusion is located on a side of the tongue relative to the connecting edge between the suspension part and the tongue. The distance between the small protrusion and the edge connecting the suspension part and the tongue is as large as possible, so as to avoid the displacement of the magnetic head in the z direction. The flexure also includes at least one cable support frame for carrying said plurality of cables. In one embodiment of the invention, the cable support frame is made of polyimide (PI) material.

A magnetic head gimbal assembly according to the present invention, comprising: a magnetic head; a suspension for carrying the magnetic head; wherein the suspension comprises: a flexible piece, one end of which has several connecting contacts for connecting with a control system, The other end has a plurality of cables; the flexible part also includes: a tongue for carrying the magnetic head; a suspension part for suspending the tongue from the flexible part; wherein, the width of the suspension part is less than The width of the tongue.

A magnetic disk drive unit of the present invention comprises: a magnetic head flap assembly; a driving arm connected with the magnetic head flap assembly; a magnetic disk; and a spindle motor for driving the magnetic disk to rotate. Wherein the magnetic head gimbal assembly includes: a magnetic head and a suspension member for carrying the magnetic head; wherein the suspension member includes: a flexible member, one end of which has a number of connection contacts for connecting with the control system, and the other end has a plurality of cables; The flexible member also includes: a tongue for carrying the magnetic head; a suspension portion for suspending the tongue from the flexible member; wherein, the width of the suspension is smaller than the width of the tongue.

Compared with the traditional technology, the cantilever of the present invention has a flexible member with an improved structure, so that the cantilever can obtain optimized stiffness, such as longitudinal stiffness, lateral stiffness and facing stiffness. That is to say, the flexible member with the improved structure makes the longitudinal stiffness and lateral stiffness of the cantilever become smaller, while the facing stiffness becomes larger, thereby ensuring good flying performance of the magnetic head, and the cantilever itself has good resonance performance . Correspondingly, good resonance performance enables the servo bandwidth of the hard disk drive and the disk storage performance of the disk drive unit to be improved. In addition, the flexible member also includes at least one cable support frame for carrying the plurality of cables on the cantilever member, and the cable support frame will prevent the plurality of cables from being deformed and reduce cable vibration, thereby ensuring the flexibility The hard drive unit of the hard disk has good static and dynamic performance. Moreover, the cable support frame can also increase the facing stiffness of the flexible member. Accordingly, the resonance performance of the disk drive unit having the flexible member is improved, and the disk storage performance of the disk drive unit is improved.

Description of drawings

FIG. 1a is a partial perspective view of a conventional disk drive unit.

FIG. 1b is a perspective view of a conventional head gimbal assembly (HGA).

FIG. 1c is a partially enlarged view of the head gimbal assembly shown in FIG. 1b.

Figure 1d shows a general flowchart for inserting a head into the HGA microdrive shown in Figure 1b.

FIG. 2 is a perspective view of a suspension member of the HGA according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of the cantilever shown in FIG. 2 .

FIG. 4 is a perspective view of a flexible member of the cantilever shown in FIG. 3 .

FIG. 5 is a graph showing the relationship between the suspension portion width c of the flexible member shown in FIG. 4 and the longitudinal stiffness and lateral stiffness of the cantilever.

FIG. 6 is a graph showing the relationship between the suspension portion width c of the flexible member shown in FIG. 4 and the facing stiffness of the cantilever member.

FIG. 7 is a graph showing the relationship between the width w of the top support bar of the flexible member shown in FIG. 4 and the longitudinal stiffness and transverse stiffness of the cantilever.

FIG. 8 is a graph showing the relationship between the width w of the top support bar of the flexible member shown in FIG. 4 and the facing stiffness of the cantilever member.

FIG. 9 is a graph showing the relationship between the width y of each side support bar of the flexible member shown in FIG. 4 and the longitudinal stiffness and transverse stiffness of the cantilever.

Fig. 10 is a graph showing the relationship between the width y of each side support bar of the flexible member shown in Fig. 4 and the facing stiffness of the cantilever member.

FIG. 11 is a partial perspective view of the flexible member shown in FIG. 4 , showing the positional relationship between the flexible member and the small protrusion on the load rod of the cantilever member shown in FIG. 2 .

Fig. 12 is the relationship curve between the suspension part width c of the flexible part shown in Fig. 11 and the corresponding z-direction displacement when the longitudinal distance d between the small protrusion of the cantilever part and the cantilever tongue has different values picture.

FIG. 13 is a graph showing the relationship between resonance gain and frequency of the cantilever shown in FIG. 2 when the facing stiffness of the cantilever shown in FIG. 2 has different values.

Fig. 14 is a graph showing the relationship between the resonance phase and the frequency of the cantilever shown in Fig. 2 when the facing stiffness of the cantilever shown in Fig. 2 has different values.

15 is a partial perspective view of a flexible member with two cable support frames on each side according to another embodiment of the present invention.

16 is a partial perspective view of a flexible member with a cable support frame on each side according to yet another embodiment of the present invention.

17 is a partial perspective view of a flexure with reduced weight cantilever tongues according to yet another embodiment of the present invention.

FIG. 18 is an exploded perspective view of the HGA including the flexure shown in FIG. 2 according to an embodiment of the present invention.

FIG. 19 is a perspective view of a disk drive unit including the HGA shown in FIG. 18 according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements. As mentioned above, the present invention aims to provide a cantilever with improved flexures to obtain optimized stiffness, especially pitch stiffness, roll stiffness and lateral stiffness, such that When the mounted small-size magnetic head is flying on the rotating magnetic disk, the magnetic head has good dynamic and static performance and a stable flying height. In addition, as the stiffness of the cantilever increases, the support position of the small protrusion of the load rod on the cantilever is also optimized. When the load force increases, the deformation of the cantilever tongue caused by the displacement in the z direction also decreases, which will make the magnetic head The flight and the micro-driver work more stably, thereby preventing the unnecessary noise of the servo device caused by the contact between the flexible member and the magnetic head caused by the large deformation of the flexible member. Therefore, the suspension of the present invention aims to optimize the structure of the suspension so as to obtain good performance when mounting a small-sized magnetic head.

Several embodiments of the cantilever of the present invention are described below. Referring to FIG. 2 and FIG. 3 , according to an embodiment of the present invention, the suspension member 1 includes a load rod 17 , a flexible member 13 , a pivot member 15 and a base plate 11 . The load bar 17 has a small protrusion 329 formed thereon. One end of the flexible member 13 has several connecting contacts 308 for connecting with a control system (not shown in the figure), and the other end of the flexible member 13 has a plurality of cables 309 , 311 .

Referring to FIG. 4 , the flexure 13 further includes a suspension tongue 328 for holding the magnetic head and a suspending portion 317 suspending the suspension tongue 328 from the flexure 13 . In the present invention, the cantilever tongue 328 includes a plurality of connection contacts 330 for connecting the plurality of cables 309 and a plurality of connection contacts 390 for connecting the plurality of cables 311 . The width c of the suspension portion 317 is smaller than the width of the cantilever tongue 328 . Here, the cantilever tongue 328 is suspended from the flexible member 13 through the suspending portion 317 to form an elastic structure. Because the width c of the suspension part 317 is relatively small, the suspension tongue 328 has relatively small longitudinal and lateral rigidity. When the magnetic head is installed on the suspension tongue, the small longitudinal and lateral rigidity will ensure flight stability.

Referring to FIG. 5 , this figure shows the relation curve between the width c of the suspending portion 317 of the flexible member 13 and the longitudinal stiffness and lateral stiffness of the cantilever 1 containing the flexible member 13 . Here, curve 297 represents the relationship between width c and longitudinal stiffness, and curve 298 represents the relationship between width c and transverse stiffness. It can be seen from the figure that both the longitudinal stiffness and the transverse stiffness of the suspension member 1 including the flexible member 13 will decrease correspondingly as the width c of the suspending portion 317 decreases. In this embodiment, the suspension portion 317 is rectangular. Apparently, the suspension part 317 can also have other suitable shapes for reducing the rigidity of the suspension member 1 . Referring to FIG. 6 , this figure shows the relation curve between the width c of the suspending portion 317 of the flexible member 13 shown in FIG. 4 and the facing stiffness of the cantilever member 1 containing the flexible member 13 . It can be seen from the figure that the facing stiffness of the suspension member 1 including the flexible member 13 decreases as the width c of the suspension portion 317 decreases.

Generally, a suspension with a small-sized magnetic head, such as a magnetic head with a size of 30% or less than 30%, can meet the following conditions to ensure that the magnetic head has good flight stability, and the suspension itself has good Resonance performance: the longitudinal stiffness and transverse stiffness of the cantilever 1 including the flexible piece 13 are both less than 1.00 μN.m/degree; while the facing stiffness of the cantilever 1 including the flexible piece 13 is greater than 1.00 μN.m/degree. Smaller longitudinal stiffness/transverse stiffness is more conducive to the flight stability of the magnetic head, and larger facing stiffness is more conducive to the resonance performance of the head gimbal assembly (HGA). 13-14 are graphs showing the relationship between the resonance performance of the HGA and the facing stiffness of the flexure of the suspension. In FIG. 13 , curves 905 , 902 , 901 and 903 are the resonance gain curves when the facing stiffness of the cantilever is 1.05, 1.15, 1.25 and 1.35 N/mm, respectively. In Fig. 14, curves 907, 910, 909 and 908 are the relevant resonance phase curves when the facing stiffness of the cantilever is 1.05, 1.15, 1.25 and 1.35 N/mm, respectively. It can be seen from these two figures that when the value of the facing stiffness is close to 1.00N/mm, such as 1.05N/mm (refer to curves 905 and 907), peaks 904/906 will appear in the low frequency stage of resonance, which means that compared with Resonance generated by components with higher face stiffness, the resonance performance is degraded, which will affect the dynamic performance of the head gimbal assembly and the servo performance of the disk drive. According to this fact and with reference to FIGS. 5-6 , it can be seen that the width c of the suspending portion 317 is preferably between 0.5mm-0.9mm. It can be understood that the width c of the suspension portion 317 can also be adjusted according to actual requirements and the size of the magnetic head.

Referring to FIG. 4 , the flexible member 13 may further include a top support bar 319 connected to the suspension part 317 in the middle of the suspension part 317 and two side support bars 315 connected to two ends of the top support bar 319 . The top support bar 319 , the two side support bars 315 , the suspension portion 317 and the flexible member 13 form two grooves 340 . In one embodiment, the grooves 340 are symmetrically distributed on two sides of the suspension portion 317 . In the present invention, the distance between the top support bar 319 and the cantilever tongue 328 , that is, the length of the suspension part 317 can be changed according to actual needs.

In the present invention, the top support bar 319 has a width w, which also affects the stiffness of the cantilever element 1 including the flexible element 13 , especially the longitudinal stiffness, transverse stiffness and facing stiffness. Referring to FIG. 7 , this figure shows the relation curve between the width w of the top support bar 319 and the longitudinal stiffness and transverse stiffness of the suspension member 1 including the flexible member 13 . Here, the curve 292 represents the relationship between the width w and the longitudinal stiffness, and the curve 291 represents the relationship between the width w and the transverse stiffness. It can be seen from the figure that the longitudinal stiffness and transverse stiffness of the cantilever element 1 including the flexible element 13 will decrease correspondingly as the width w of the top support bar 319 decreases. Referring to FIG. 8 , this figure shows the relationship between the width w of the top support bar 319 and the facing stiffness of the cantilever 1 including the flexible member 13 . It can be seen from the figure that the facing stiffness of the cantilever 1 including the flexible member 13 will decrease correspondingly as the width w of the top support bar 319 decreases. Similarly, in order to ensure that the magnetic head has good flight stability and the suspension has good resonance performance, the longitudinal stiffness and lateral stiffness of the suspension 1 containing the flexible piece 13 should be less than 1.00 μN.m/degree; The facing stiffness of the cantilever part 1 of the part 13 should be greater than 1.00 μN.m/degree. According to this fact and with reference to FIGS. 7-8 , it can be seen that the width w of the top support bar 319 is preferably greater than 0.085mm. It can be understood that the width w of the top support bar 319 can be adjusted according to actual requirements and the size of the magnetic head.

In the present invention, each side support bar 315 has a width y, which also affects the stiffness of the suspension member 1 including the flexible member 13, especially longitudinal stiffness, transverse stiffness and facing stiffness. Referring to FIG. 9 , this figure shows the relationship curve between the width y of the side support bar 315 and the longitudinal stiffness and transverse stiffness of the suspension member 1 including the flexible member 13 . Here, curve 294 represents the relationship between width y and longitudinal stiffness, and curve 293 represents the relationship between width y and transverse stiffness. It can be seen from the figure that the longitudinal rigidity and lateral rigidity of the suspension member 1 including the flexible member 13 will decrease correspondingly as the width y of the side support bar 315 decreases. Referring to FIG. 10, this figure shows the relationship curve between the width y of the side support bar 315 and the facing stiffness of the cantilever member 1 containing the flexible member 13. It can be seen from the figure that the facing stiffness of the cantilever 1 including the flexible member 13 will decrease correspondingly as the width y of the side support bar 315 decreases. Similarly, in order to ensure that the magnetic head has good flight stability and the suspension has good resonance performance, the longitudinal stiffness and lateral stiffness of the suspension 1 containing the flexible piece 13 should be less than 1.00 μN.m/degree; The facing stiffness of the cantilever part 1 of the part 13 should be greater than 1.00 μN.m/degree. According to this situation and with reference to FIGS. 9-10 , it can be seen that the width y of the side support bar 315 is preferably greater than 0.10 mm. Understandably, the width y of the side support bar 315 can be adjusted according to actual requirements and the size of the magnetic head.

In the present invention, with reference to FIGS. 2-4, when the flexible member 13 is assembled to the load bar 17, the pivot member 15 and the base plate 11 to form the cantilever 1, the small protrusion 329 on the load bar 17 will The suspension portion 317 is supported, and keeps the load force always applied to the central area of the magnetic head. With reference to Fig. 11, since two grooves 340 are symmetrically formed on both sides of the suspension part 317, an elastic structure with the small protrusion 329 as a supporting pivot is formed on the cantilever member 1. According to the principle of leverage, due to the Parts in the suspended state and the deformation of the tongue, the distance d formed between the small protrusion 329 to the connecting edge of the cantilever tongue 328 and the suspension part 317 will affect the magnetic head installed on the flexible member 13. Z direction displacement. Referring to FIG. 12 , this figure shows the relationship between the width c of the flexible member 13 and the corresponding displacement in the z direction when the distance d has different values. Here, the curve 200 represents the relationship curve when the distance d is 0.2 mm; the curve 201 represents the relationship curve when the distance d is 0 mm. It can be seen from the figure that when the width c of the suspension portion 317 is the same, the z-direction displacement of the magnetic head decreases as the distance d decreases. Therefore, when other parameters of the suspension 1 are the same, the distance d is preferably close to zero to prevent the z-direction displacement of the magnetic head.

Referring to FIG. 15, according to another embodiment of the present invention, a flexible member 13' has a structure similar to that of the flexible member 13 shown in FIG. 2, but may further include two cables located on each side of the flexible member 13' A support frame 270 (trace support bridge), used to support a plurality of cables 309, 311. In this embodiment, the cable support frame 270 is strip-shaped and extends from the side support bar 315 , and has sufficient length to carry the plurality of cables 309 , 311 . Optimally, the cable support frame 270 can be made of polyimide (PI) material, so as to have sufficient strength and rigidity. It can be understood that the cable support frame 270 can be formed of other suitable materials to carry the plurality of cables 309 , 311 . Since the cable support frame 270 carries the plurality of cables 309, 311, the plurality of cables 309, 311 can be prevented from being deformed during the manufacturing process, and the vibration of the conductors when the magnetic head flies over the magnetic disk is reduced, thus ensuring the use of Static and dynamic performance of HGA with flexure 13' in disk drive. Moreover, the cable support frame 270 can increase the facing stiffness of the flexure 13 at the same time, which helps to improve the dynamic and static performance of the magnetic head.

Referring to Fig. 16, according to yet another embodiment of the present invention, the flexible member 13" has a structure similar to that of the flexible member 13 shown in Fig. 15, but may further include a A single cable support frame 270 supporting a plurality of cables 309,311. The cable support frame 270 also extends from the side support bars 315 . It can be understood that the number of the cable support frame 270 can be changed according to the actual needs of the flexible member and the cantilever member. In addition, the cable support frame 270 may have other suitable shapes for carrying the plurality of cables 309 , 311 .

Referring to FIG. 17, according to an embodiment of the present invention, the flexible member 13'' has a structure similar to that of the flexible member 13 shown in FIG. 2, but has a different cantilever tongue piece 328'. Sheet 328, the cantilevered tongue 328' has a weight-saving structure. In one embodiment, as shown in Figure 17, the cantilevered tongue 328' is trapezoidal in shape. However, the shape of the cantilever tongue 328' is not limited thereto, but can have any suitable shape so as to reduce the corresponding weight and obtain an optimized rigidity of the flexible member 13''. In this embodiment, the cantilever tongue 328' has a weight-reducing structure, so that the overall weight of the flexible member 13'' and the cantilever is reduced, so that the shock resistance of the disk drive with the flexible member is improved.

Referring to FIG. 18, according to an embodiment of the present invention, a head gimbal assembly (head gimbal assembly, HGA) includes a magnetic head 203, a U-shaped microdrive 205 including two arms 217 holding the magnetic head 203 therebetween, and is used to carry the magnetic head 203. The suspension member 1 of the magnetic head 203 and the micro-driver 205 . The magnetic head 203 is displaced by the movement of the side arm 217 . In this embodiment, the micro-actuator 205 includes a U-shaped ceramic frame composed of two side arms 217, wherein each side arm 217 is mounted with a piezoelectric element 216. The micro-actuator 205 is physically attached to the flexure 13 by means of glue, such as epoxy glue. Several electrical connection balls (gold ball soldering or tin ball soldering, GBB or SBB, not shown in the figure) fix the PZT element micro-driver 205 on the cantilever cable 311 located on both sides of the above-mentioned side arm 217 . In addition, several electrically connecting metal balls (GBB or SBB, not shown in the figure) mount the magnetic head 203 on the suspension cable 309 . In the present invention, the micro-driver 205 is not limited to the U-shaped micro-driver, other suitable micro-drivers, such as film-type micro-drivers, metal-supported micro-drivers (replacing the ceramic material of the U-shaped micro-driver 205) can be applied in In the present invention. It can be understood that the HGA may not have a microdrive, and the magnetic head 203 is only driven by a voice coil motor (VCM) of the disk drive to generate displacement.

According to an embodiment of the present invention, referring to FIG. 19 , the disk drive unit 5 is formed by assembling a housing 508, a disk 501, a rotary motor 502, a voice coil motor (VCM) 507, and the HGA 2 of the present invention. Since the structure and/or assembly process of the disk drive unit of the present invention are familiar to those skilled in the art, no detailed description is given here.

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations made according to the essence of the present invention.

Claims (21)

1. A suspension for head gimbal assembly, comprising: A flexible piece, one end of the flexible piece has several connecting contacts for connecting with the control system, and the other end has a plurality of cables; it is characterized in that the flexible piece also includes: the tongue carrying the magnetic head; A suspending portion for suspending the tongue from the flexible member; wherein, the width of the suspending portion is smaller than the width of the tongue. 2. The suspension member according to claim 1, wherein the flexible member further comprises a top support bar connected to the middle area of the suspension part and two side supports connected to both ends of the top support bar strip. 3. The cantilever according to claim 2, wherein the width of the top support bar is greater than 0.085 mm. 4. The cantilever according to claim 2, characterized in that the width of the side support strip is greater than 0.10 mm. 5. The suspension member according to claim 1, characterized in that: the width of the suspension part is between 0.5-0.9 mm. 6. The cantilever according to claim 1, wherein said cantilever further comprises a load bar having a small protrusion for supporting said tongue, wherein said small protrusion is positioned to support said cantilever position of the holder. 7. The cantilever according to claim 6, wherein the small protrusion is located on the connecting edge between the suspension part and the tongue. 8 . The cantilever according to claim 6 , wherein the small protrusion is located on a side of the tongue opposite to the connecting edge between the suspension part and the tongue. 9. The suspension member according to claim 2, wherein the flexible member further comprises at least one cable support frame for carrying the plurality of cables. 10. The cantilever according to claim 9, wherein the cable support frame is made of polyimide (PI) material. 11. A magnetic head gimbal assembly, comprising: magnetic head; A suspension for carrying the magnetic head; wherein the suspension includes: A flexible piece, one end of the flexible piece has several connecting contacts for connecting with the control system, and the other end has a plurality of cables; it is characterized in that the flexible piece also includes: Tongues for carrying magnetic heads; A suspending portion for suspending the tongue from the flexible member; wherein, the width of the suspending portion is smaller than the width of the tongue. 12. The HGA according to claim 11, wherein the suspension member further comprises a load bar having a small protrusion for supporting the tongue, wherein the small protrusion is placed on the support The position of the suspension part is described. 13. The HGA according to claim 11, wherein the flexible member further comprises a top support bar connected to the middle area of the suspension part and two top support bars connected to both ends of the top support bar. Side support bars. 14. The HGA according to claim 13, wherein the width of the top support bar is greater than 0.085 mm. 15. The HGA according to claim 13, wherein the width of the side support bar is greater than 0.10 mm. 16. The HGA according to claim 12, wherein the small protrusion is located on the connecting edge between the suspension part and the tongue. 17. The HGA according to claim 12, wherein the small protrusion is located on a side of the tongue opposite to the connecting edge between the suspension part and the tongue. 18. The HGA according to claim 12, wherein the flexible member further comprises at least one cable support frame for carrying the plurality of cables. 19. The HGA according to claim 18, wherein the cable support frame is made of polyimide (PI) material. 20. The HGA according to claim 12, wherein the HGA further comprises a micro-driver for fixing and displacing the magnetic head. 21. A disk drive unit comprising: Magnetic head flap assembly; a drive arm coupled to the head gimbal assembly; disk; and A spindle motor that drives the disk to rotate; wherein the head gimbal assembly includes: A magnetic head and a suspension for carrying the magnetic head; wherein the suspension includes: A flexible member having connection contacts at one end for connection to a control system and a plurality of cables at the other end; characterized in that the flexible member further comprises: Tongues for carrying magnetic heads; A suspending portion for suspending the tongue from the flexible member; wherein, the width of the suspending portion is smaller than the width of the tongue.

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