CN1917044A - Flexible cable frame assembly and flexible cable cantilever assembly for disk drives - Google Patents

Abstract

The present invention discloses a flexible cable frame assembly for a head flap assembly, comprising a micro-drive frame and a flexible cable mounted on the micro-drive frame. The flexible cable comprises a first group of connection contacts at one end thereof, a second group of connection contacts at the other end thereof, and a wire (trace) integrated on the flexible cable for connecting the two groups of connection contacts.

Description

Flexible cable frame assembly and flexible cable cantilever assembly for disk drives

technical field

The invention relates to an information recording disk drive device, in particular to a microdriver and a cantilever used in a magnetic head gimbal combination of a disk drive system, and a microdriver and a cantilever used to reduce wire vibration.

Background technique

A common type of information storage device is a magnetic disk drive system that uses magnetic media to store data and a moving read/write head positioned over the magnetic media to selectively read data from and write data to the magnetic media superior.

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, disk manufacturers have been devoting themselves to developing disk drive units with higher storage capacity, such as increasing the density of tracks by reducing the track width or track pitch on the disk, thereby indirectly increasing the storage capacity of the disk. However, as the track density increases, the accuracy of the position control of the read/write head must also be improved accordingly in order to achieve faster and more accurate read/write operations in high-density disks. As track densities increase, it becomes more difficult to achieve faster and more precise positioning of the read-write head to the proper track on the disk using conventional techniques. As a result, disk manufacturers are constantly looking for ways to increase control over the position of the read/write heads in order to take advantage of increasing track densities.

One method often used by disk manufacturers to improve the accuracy of position control of the read/write head on high-density disks is to use a second drive, also called a microdrive. The micro drive cooperates with a main drive to control the position accuracy and access speed of the read-write head. Disk drive units that contain microdrives are known as dual drive systems.

Many dual-drive systems have been developed in the past to increase the access speed and positioning accuracy of the read/write head on the tracks of high-density magnetic disks. This dual-driver system usually includes a main voice coil motor driver and a secondary micro-driver, such as a piezoelectric micro-driver (ie, a piezoelectric element micro-driver, hereinafter referred to as a piezoelectric micro-driver). The voice coil motor driver is controlled by a servo control system which 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 piezoelectric 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 provides coarse adjustment of the position of the read-write head, while the piezoelectric micro-actuator micro-driver provides 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.

A known microactuator for fine-tuning the position of a read/write head includes a piezoelectric microactuator. The piezoelectric microactuator has an associated electrically actuated drive device that causes selective contraction or expansion of the piezoelectric microactuator on the microactuator. The piezoelectric microactuator is structured such that contraction or expansion of the piezoelectric microactuator causes movement of the microactuator, which in turn causes movement of the read/write head. The movement of the read/write head enables faster and more precise adjustment of the position of the read/write head compared to a disk drive unit that only uses a voice coil motor drive. Such exemplary piezoelectric micro-actuators are disclosed in many patents, such as Japanese Patent JP 2002-133803 entitled "Micro-actuator and HGA combination", and HGA assembly entitled "HEAD GAMEPLAY WITH DRIVE FOR FINE POSITION ADJUSTMENT" , a magnetic disk drive unit comprising the head gimbal assembly and a manufacturing method of the head gimbal assembly "Japanese Patent JP 2002-074871.

Figure 1 shows a conventional disk drive system. A magnetic disk 101 is mounted on and rotated by a rotary motor 102 . A VCM arm 104 carries the HGA 100 , the HGA 100 includes a micro-drive 105 including a magnetic head 103 on which a read/write head is mounted. 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 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 running state, an aerodynamic contact is formed between the magnetic head 103 including the read/write head and the rotating magnetic disk 101 to generate a lift force. The lift force is equal and opposite to the spring force exerted by the suspension of the HGA 100 to balance each other, thereby forming and maintaining a predetermined flying height above the surface of the rotating disk 101 during the rotation of the motor arm 104 .

FIG. 2 shows the HGA 100 of the disk drive unit with dual drives in FIG. 1 . 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. On the contrary, it affects the performance of the read-write head to accurately read and write data on the disk. For this reason, the above-mentioned piezoelectric micro-driver 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 piezoelectric micro-driver adjusts the displacement of the magnetic head 103 in a smaller range, so as to compensate the manufacturing error of the voice coil motor and/or head suspension combination. The piezoelectric microactuator makes it possible to apply smaller track pitches, and can increase the track density (TPI, the number of tracks per inch) of the disk drive unit by 50%, while reducing the seek time and settling time of the magnetic head. time. Therefore, the piezoelectric microdrive microdrive can greatly increase the storage capacity of the storage disk.

As shown in FIG. 2 , the HGA 100 includes a suspension 106 with a flexible member 108 . The flexible member 108 has a cantilever tongue 110 for carrying the piezoelectric micro-actuator 105 and the magnetic head 103 . Two wires 112 , 114 protrude outward from two sides of the cantilever tongue 110 of the flexible member 108 . One end of each wire is connected to a movable plate 116 and the other end is connected to a plurality of wires 118 interconnected with connection contacts 120 .

Referring to FIG. 3 , a conventional piezoelectric micro-actuator 105 includes a metal frame 130 including a top plate 132 , a bottom plate 134 and two side arms 136 , 138 connecting the top plate 132 and the bottom plate 134 . Piezoelectric units 140 , 142 are installed on the two side arms 136 , 138 respectively. The magnetic head 103 is mounted on the top plate 132 .

Referring to FIG. 4 , the piezoelectric micro-actuator 105 is mounted on the cantilever tongue 110 by means of the bottom plate 134 of its metal frame 130 . The bottom plate 134 can be fixed to the cantilever tongue 110 by epoxy glue or laser welding. Three electrical connection balls 150 (gold ball connection or solder ball connection) fix the piezoelectric micro-actuator 105 on the cantilever wires 118 on both sides of the piezoelectric unit 140 , 142 . In addition, a plurality of electrical connection balls such as four electrical connection balls (gold ball connection or solder ball connection) connect the magnetic head 103 to the suspension wire 118 so as to electrically connect the read/write unit on the magnetic head 103 . When a voltage is applied to the piezoelectric elements 140, 142 through the cantilever wire 118, the piezoelectric elements 140, 142 contract or expand causing their side arms 136, 138 to bend laterally. This bending causes the metal frame body 130 to produce shear deformation, that is, the shape of the metal frame body 130 changes from a rectangle to a parallelogram, thereby causing the movement of the top plate 132, which in turn causes the magnetic head 103 installed on the top plate 132 to move along the disk track, so that The position of the read/write head can be adjusted precisely. Through the above method, the position control of the magnetic head and the fine adjustment of the position of the read/write head can be realized.

FIG. 5 shows the actuation process of the piezoelectric micro-driver 105 when a voltage is applied to the piezoelectric units 140 and 142 . For example, when a sinusoidal voltage is applied to the piezoelectric unit 140 of a piezoelectric micro-actuator with a positive polarity in the first half cycle, the piezoelectric unit 140 will contract and cause the side arm 136 to deform in a wavy manner. Since the magnetic head 103 is mounted on the top plate 132, this deformation will cause the magnetic head to move to the left. Similarly, when a sinusoidal voltage is applied to the piezoelectric unit 142 of the piezoelectric micro-actuator with positive polarity during the second half cycle, the piezoelectric unit 142 will contract and cause the side arm 138 to deform in a wave-like manner. This deformation will cause the head to move to the right. The above-mentioned motion depends on the polarity direction of the piezoelectric unit of the piezoelectric micro-driver and the situation of voltage application, but its working principle is very simple.

Referring to FIG. 6 , two outwardly protruding wires 112 , 114 are used to electrically connect a plurality of wires 118 to the movable plate 116 , which is electrically connected to the magnetic head 103 . In order to reduce the wire resistance caused by the rigidity of the wire and to maintain the performance of the micro-driver during operation, the wires 112 and 114 are bent and arranged on both sides of the cantilever tongue 110 . This arrangement allows the wires 112, 114 to vibrate and move during head seek and reset operations of the disk drive unit during which the microdrive generates motion. Vibration or movement of the aforementioned wires will cause the head to come off the track. For disk drive units with higher rotational speeds and multiple disk configurations, the outwardly bent wires 112, 114 will also cause windage problems due to air flow hitting the wires or suspension. The above two points will lead to the degradation of the position error signal (PES) and non-repeatable run-out (NRRO) performance of the magnetic head. This will limit the performance and capacity of the disk drive unit.

For example, FIG. 6 shows the movement of the wires 112, 114 when the micro-actuator 105 is activated. As shown, when a voltage is applied to the micro-actuator 105, the movement of the side arms 136, 138 causes the wire 112 to swing towards the back of the suspension 106 and the wire 114 to swing towards the top surface of the head. The above-mentioned swing will generate suspension resonance, which is one of the reasons for the head to deviate from the magnetic track.

FIG. 7 shows the deviation of the magnetic head from the magnetic track due to the movement of the wire when the micro-driver is activated in the conventional technology. As discussed above, conventional designs include outwardly protruding wires 112,114. The displacement of the head off-track due to wire movement is measured in terms of frequency. As shown in the figure, the displacement trend includes three peaks 160 (such as values corresponding to 4Khz, 6.3Khz, and 8.5Khz).

FIG. 8 shows measurement data of the non-repeatable run-out (NRRO) performance of the magnetic head in the conventional technology. As shown in the figure, a number of peaks 170 represent the deviation of the magnetic head from the magnetic track at different frequencies, which represent a relatively obvious head deviation caused by the movement of the wire.

It is therefore necessary to provide an improved system in order to overcome the above-mentioned disadvantages.

Contents of the invention

One aspect of the present invention relates to a micro-driver and a cantilever with a structure for reducing the vibration of a wire.

Another aspect of the present invention relates to a micro-actuator with a flexible cable frame combination and a cantilever with a flexible cable cantilever combination.

Another aspect of the present invention relates to a flexible cable frame assembly for a head gimbal assembly. The flexible cable frame combination includes a micro-drive frame body and a flexible cable installed on the micro-drive frame body. The flexible cable includes a first group of connection contacts at one end, a second group of connection contacts at the other end, and traces integrated on the flexible cable for connecting the above two groups of connection contacts.

Another aspect of the present invention relates to a magnetic head gimbal assembly comprising a flexible cable frame assembly, which includes a flexible cable frame assembly comprising a microdrive frame and a frame flexible cable mounted on the microdrive frame; a magnetic head; and supporting the above-mentioned The flexible cable frame is combined with the cantilever of the magnetic head. The suspension arm includes a flexible cable suspension assembly including a suspension flexure and a flexible cable mounted on the flexure.

Still another aspect of the present invention relates to a magnetic disk drive device. The disk drive device includes a magnetic head gimbal assembly; the magnetic head gimbal assembly includes a flexible cable frame assembly, a magnetic head, and a suspension arm supporting the flexible cable frame assembly and the magnetic head. The disk drive device further includes a drive arm connected to the head gimbal; a disk; and a spindle motor capable of rotating the disk. The flexible cable frame assembly includes a micro-drive frame and a flexible cable installed on the micro-drive frame. Wherein the flexible cable includes a first group of connection contacts at one end, a second group of connection contacts at the other end, and a wire (trace) integrated on the flexible cable for connecting the above two groups of connection contacts .

A magnetic head gimbal assembly, which includes a micro-drive frame, a flexible cable installed on the micro-drive frame, a magnetic head, and a cantilever carrying the above-mentioned flexible cable frame assembly and the magnetic head. The disk drive unit also includes a drive arm combined with the head gimbal, a disk, and a rotation motor for driving the disk. The flexible cable frame combination includes a micro-drive frame body and a flexible cable installed on the micro-drive frame body. The flexible cable includes a first set of connecting contacts at one end of the flexible cable, a second set of connecting contacts at the other end of the flexible cable, and is integrated on the flexible cable to connect the first set of connecting contacts with the second set of connecting contacts of wires.

Yet another aspect of the present invention relates to a method for manufacturing a HGA. The method includes providing a micro-actuator frame; mounting a frame-flexible cable on the micro-drive frame, wherein the frame-flexible cable includes first and second sets of connecting contacts and an integrated assembly connecting the two sets of connecting contacts. wire; the piezoelectric element is installed on the micro-drive frame; the micro-drive frame is installed on the cantilever; the piezoelectric element is electrically connected to the cantilever wire on the cantilever; the magnetic head is installed on the micro-drive on the drive frame; electrically connecting the magnetic head to the suspension wire on the suspension; performing appearance inspection; testing the magnetic head and piezoelectric performance; and cleaning.

Other aspects, features and advantages of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings, which belong to a part of the summary of the invention and are used to illustrate the principles of the invention.

Description of drawings

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

FIG. 2 is a perspective view of a conventional head gimbal assembly.

FIG. 3 is a perspective view of the magnetic head and the piezoelectric micro-actuator of the magnetic head gimbal assembly shown in FIG. 2 .

FIG. 4 is a partial perspective view of the head gimbal assembly shown in FIG. 2 .

FIG. 5 is a top view of the magnetic head and the piezoelectric micro-actuator of the magnetic head gimbal assembly shown in FIG. 2 when they are in use.

FIG. 6 is a partial perspective view of the assembled state of the magnetic head gimbal shown in FIG. 2 .

Figure 7 shows the situation of the off track displacement (off track displacement) of the magnetic head due to the movement of the wire (trace) in the conventional technology.

FIG. 8 shows the non-repeatable run-out (NRRO) performance of a prior art head.

FIG. 9 is a perspective view of a HGA including a piezoelectric microactuator described in one embodiment of the present invention.

FIG. 10 is a partial perspective view of the HGA shown in FIG. 9 .

FIG. 11 is an exploded view of the head gimbal assembly shown in FIG. 10 .

FIG. 12 is a side view of the HGA shown in FIG. 10 .

FIG. 13 is a perspective view of the piezoelectric micro-actuator shown in FIG. 9, isolated from the magnetic head and suspension.

FIG. 14 is an exploded view of the piezoelectric micro-actuator shown in FIG. 13 .

FIG. 15 shows the derailment displacement of the magnetic head of the HGA shown in FIG. 9 due to the movement of the wire.

FIG. 16 shows the head non-repeatable deflection (NRRO) performance of the head gimbal assembly shown in FIG. 9 .

Figure 17 is a fabrication flow diagram described in one embodiment of the invention.

18 is an exploded view of a HGA including a piezoelectric microactuator and a suspension described in another embodiment of the present invention.

FIG. 19 is a perspective view of the assembled head gimbal shown in FIG. 18 .

FIG. 20 is a partial perspective view of the HGA shown in FIG. 18 .

Figure 21 is a fabrication flow diagram described in another embodiment of the present invention.

FIG. 22 is an exploded view of a HGA described in another embodiment of the present invention.

23 is a perspective view of a HGA including a piezoelectric microactuator described in yet another embodiment of the present invention.

24 is a perspective view of a HGA including a piezoelectric microactuator described in yet another 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 reduce the vibration of the wires in the HGA while precisely driving the magnetic head using a micro-driver. One aspect of the present invention is to provide a micro-actuator with a flexible cable frame assembly to reduce the vibration of the wires in the head gimbal assembly. Another aspect of the present invention is to provide a suspension with a flex cable suspension assembly to reduce wire vibration in the HGA. The performance of the disk drive is improved by reducing the vibration of the wires in the head gimbal assembly.

Several embodiments of microactuators and suspensions for HGAs are now described. It should be noted that the micro-actuator and suspension can be applied to any suitable disk drive device with micro-actuation and suspension to reduce wire vibration, and is not limited to the specific structure of the HGA shown in the drawings. That is, the present invention is applicable to any suitable device including a micro-actuator and a cantilever in any field.

9 to 12 illustrate a head gimbal assembly (HGA) 210 (head gimbal assembly, HGA) including a piezoelectric micro-actuator 212 according to an embodiment of the present invention. The HGA 210 includes a piezoelectric micro-actuator 212 , a magnetic head 214 , and a suspension 216 for supporting or suspending the piezoelectric micro-actuator 212 and the magnetic head 214 .

As mentioned above, the cantilever 216 includes a base plate 218 , a load beam 220 , a pivot member 222 , a flexible member 224 and inner and outer suspension traces 226 , 227 (suspension traces) on the flexible member 224 . The base plate 218 includes mounting holes 228 for attaching the suspension arm 16 to the drive arm of a voice coil motor (VCM) of a disk drive. The shape of the substrate 218 varies depending on the configuration or style of the magnetic disk drive. Moreover, the substrate 218 is formed of a relatively hard or rigid material such as metal, so as to stably support the cantilever 216 on the driving arm of the voice coil motor.

The pivot member 222 is assembled on the base plate 218 and the load beam 220 by, for example, welding. As shown, the pivot member 222 includes a hole 230 aligned with the mounting hole 228 on the base plate 218 . In addition, the pivot member 222 further includes a holding bar 232 for supporting the load beam 220 .

The load beam 220 is mounted on the holding bar 232 of the pivot member 222 by, for example, welding. A small protrusion 234 is formed on the load beam 220 to cooperate with the flexible member 224 (refer to FIG. 12 ). The load beam 220 acts like a spring or a shock absorber to buffer the vibration of the magnetic head 214 against the suspension 216 . The load beam 220 optionally has a lifting piece 236 on it, and the lifting piece 236 lifts the HGA 210 from the disk when the disk stops rotating.

The flexible member 224 is mounted on the pivot member 222 and the load beam 220 by means such as lamination or welding. The flexible member 224 is provided with a cantilever tongue 238 for connecting the piezoelectric micro-actuator 212 to the cantilever 216 (refer to FIG. 11 ). The cantilever tongue 238 cooperates with the small protrusion 234 on the load beam 220 . At the same time, the cantilever wires 226 and 227 arranged on the flexible member 224 electrically connect a plurality of connection contacts 240 (connected to an external control system) with the magnetic head 214 and the piezoelectric element 242 on the piezoelectric micro-driver 212 . The cantilever wires 226, 227 may be flexible printed circuits (FPC) and may include any suitable number of wires.

As shown in FIGS. 10 and 11, the connection contacts 244 are directly connected to the inner cantilever wire 226 so as to electrically connect the inner cantilever wire 226 to the connection contacts 246 of the flexible cable frame assembly of the piezoelectric micro-actuator. The contact point 246 is electrically connected to the magnetic head 214 . Meanwhile, the connection contact 248 is directly connected to the outer cantilever wire 227 so as to electrically connect the outer cantilever wire 227 to the connection contact 250 on the piezoelectric element 242 .

A voice coil motor is provided in the disk drive to controllably drive the drive arm, thereby controllably driving the HGA 210 and causing the HGA 210 to position the magnetic head 214 and its read/write head at A specific track of information on a disk in a disk drive. The micro-driver 212 is used to realize fast and precise position control for the disk drive device, and at the same time reduce the time for tracking and positioning of the magnetic head during operation. Thus, when the HGA 210 is incorporated into a disk drive, a dual drive system is formed in which the voice coil motor drive enables greater positional adjustment of the read/write head, while the piezo microdrive 212 enables control of the read/write head. Fine-tuning of the head position.

11 , 13 and 14 illustrate piezoelectric microactuator 212 isolated from magnetic head 214 and suspension 216 . As shown in the figure, the piezoelectric micro-driver 212 includes a flexible cable frame assembly 255 (flex cable frame assembly) and a piezoelectric element 242 mounted on the flexible cable frame assembly 255 . The flexible cable frame assembly 255 includes a micro-drive frame body 252 and a frame flexible cable 257 .

The micro-drive frame 252 includes a top support plate 254 , a bottom support plate 256 , a side arm 258 connecting the top support plate 254 and the bottom support plate 256 , and a connecting contact support plate 260 extending from the top support plate 254 . The micro-actuator frame 252 can be formed of any suitable material, such as metal, by any suitable process.

The piezoelectric element 242 is mounted on each side arm 258 of the micro-actuator frame 252 by means of eg epoxy glue, adhesive or anisotropic conductive film (ACF), so as to form the piezoelectric micro-actuator 212 . Each piezoelectric element 242 has a plate shape formed by laminated thin films made of piezoelectric material such as PZT, and uses Ni-Ag (nickel-silver), Pt (platinum) or gold as electrodes. In another embodiment, the piezoelectric element 242 is a single-layer or multi-layer ceramic piezoelectric element. However, the one or more piezoelectric elements 242 may be mounted to the side arm 258 in any suitable manner.

The frame flex cable 257 includes an insulating layer 261 including a top 263 , a bottom 265 and a middle portion 267 connecting the top 263 and the bottom 265 . As shown, the intermediate portion 267 includes relatively inwardly curved edges forming a weak point between the top 263 and bottom 265 . A plurality of, for example four, magnetic head connecting contacts 264 are formed on the top 263 ; and a plurality of, for example four, cantilever connecting contacts 246 are formed on the bottom 265 . The magnetic head connecting contact 264 and the suspension connecting contact 246 are electrically connected to each other through the wire 266 on the insulating layer 261 .

The frame flex cable is mounted by mounting the top 263 of the insulating layer 261 to the top support plate 254 of the microactuator frame 252 and the bottom 265 of the insulating layer 261 to the bottom support plate 256 of the microactuator frame 252. 257 is installed on the microdrive frame 252. The insulating layer 261 can be fixed on the micro-actuator frame 252 by means of, for example, epoxy glue, adhesive or anisotropic conductive film (ACF).

As shown in FIG. 10 , the bottom support plate 256 of the micro-actuator frame 252 fixes the piezoelectric micro-actuator 212 to the cantilever 216 . Specifically, the bottom support plate 256 is partially mounted on the cantilever tongue 238 of the flexible member 224 by means such as epoxy glue, resin or laser welding. The cantilever connecting contact 246 of the frame flexible cable 257 is electrically connected to the corresponding connecting contact 244 on the cantilever 216 via an electrical connection 262 , for example, a wire connection. This connects the bottom support plate 256 to the cantilever 216 and electrically connects the frame flex cable 257 to the inner cantilever wire 226 . At the same time, a parallel gap 280 is formed between the piezoelectric micro-actuator 212 and the cantilever tongue 238 so that the piezoelectric micro-actuator 212 can move freely when in use, as shown in FIG. 12 .

The top support plate 254 of the micro-actuator frame 252 and the top 263 of the frame flexible cable 257 have structures that can connect the piezoelectric micro-actuator 212 to the magnetic head 214 . Specifically, one end of the magnetic head 214 is provided with a plurality of connecting contacts 268 , such as four connecting contacts, corresponding to the magnetic head connecting contacts 264 on the frame flexible cable 257 . The top support plate 254 and the top 263 support the magnetic head 214 thereon, and the magnetic head connection contacts 264 on the frame flexible cable 257 are connected to the corresponding connection contacts 268 on the magnetic head 214 by means of, for example, electrical connection balls 270 (GBB or SBB). Electrical connections (refer to Figures 10 and 12). Thus, the piezoelectric micro-actuator 212 is connected to the magnetic head 214 to form a magnetic head and piezoelectric micro-actuator combination 274 , and the magnetic head 214 and its read/write elements are electrically connected to the inner cantilever wire 226 of the cantilever 216 .

In the above embodiment, the wire 266 has four wires between the four magnetic head connection contacts 264 and the four cantilever connection contacts 246 . However, any suitable number of wires and contacts may be used.

The piezoelectric element 242 on the piezoelectric micro-driver 212 is electrically connected to the outer cantilever wire 227 . Specifically, the connection contacts 250 on the piezoelectric element 242, such as two connection contacts, are connected to the connection contacts on the outer cantilever wire 227, such as two connection contacts 248, by means of an electrical connection ball 276 (gold ball connection or Solder ball connections, GBB or SBB) are electrically connected to each other. Thus, a voltage is applied to the piezoelectric element 242 through the outer cantilever wire 227 .

In use, for example, by applying a voltage to the piezoelectric element 242 , the piezoelectric element 242 is excited to cause it to selectively contract or expand. The piezoelectric microactuator 212 is constructed such that contraction or expansion of the piezoelectric element 242 causes movement of the side arm 258, which in turn causes movement of the top support plate 254, which in turn causes A magnetic head 214 on an electrical micro-actuator 212 generates motion.

Since the wire 266 is integrated in the frame flexible cable 257 and the contact support plate 260 is integrated in the micro-actuator frame 252, when the piezoelectric micro-actuator 212 is working, the above-mentioned components will not generate extra vibration. The performance of the disk drive can be improved by reducing the vibration of the wires in the HGA. Furthermore, the yield of the piezoelectric microactuator 212 with integrated wires 266 and connecting contact support plate 260 is improved because the aforementioned components are less prone to deformation during suspension, HGA, and disk drive manufacturing. In addition, the micro-actuator frame 252 and the frame flexible cable 257 have a relatively simple structure and manufacturing process, which can reduce product design and manufacturing costs.

FIG. 15 shows the derailment displacement of the magnetic head caused by the movement of the wire when the piezoelectric micro-actuator 212 works. Compared with the test results of the conventional technology shown in FIG. 7 , the three peaks 284 shown in FIG. 15 are improved relative to the peak 160 shown in FIG. 7 (for example, at 4Khz, 6.3kHz and 8.5Khz).

FIG. 16 shows test data for the non-repeatable run-out (NRRO) performance of the magnetic head for the piezoelectric micro-actuator 212 . Compared with the test results of the conventional technology shown in FIG. 8 , the peak value 286 shown in FIG. 16 is improved relative to the peak value 170 shown in FIG. 8 .

FIG. 17 shows the main steps of the manufacturing and assembly process of the HGA described in one embodiment of the present invention. After the flow process starts (step 1 in Figure 17), the flexible cable is installed on the micro-driver frame (step 2 in Figure 17), and the flexible cable and the micro-driver frame can be as shown in Figure 9 to Figure 14 structure shown. Next, the piezoelectric element is mounted on the side arm of the micro-actuator frame (step 3 in FIG. 17 ) to form a piezoelectric micro-actuator. Next, the micro-actuator frame of the piezoelectric micro-actuator is installed on the cantilever tongue of the cantilever by means such as welding (step 4 in FIG. 17 ). After the above installation is completed, the piezoelectric element is electrically connected to the cantilever wire of the cantilever (step 5 in FIG. 17 ). Next, install the magnetic head on the piezoelectric micro-actuator (step 6 in FIG. 17 ), and electrically connect the magnetic head to the cantilever wire on the cantilever (step 7 in FIG. 17 ). Then, perform visual inspection on the head gimbal assembly (step 8 in FIG. 17 ), and test the magnetic head and piezoelectric performance (step 9 in FIG. 17 ). In the last step, the HGA is cleaned (step 10 in FIG. 17).

18 to 20 illustrate an HGA 310 including a piezoelectric micro-actuator 312 and a suspension 316 according to another embodiment of the present invention. In this embodiment, the piezoelectric microactuator 312 includes a flexible cable frame assembly 355, wherein the flexible cable 357 includes an extension 394, such as a tail guide, to facilitate attachment to the cantilever 316. The suspension 316 also includes a flexible cable suspension assembly 300 mounted on a flexure 324 .

As shown in FIG. 18 , the cantilever 316 includes a base plate 318 , a pivot member 322 installed on the base plate 318 , a load beam 320 installed on the holding bar of the pivot member 322 , and a load beam 320 installed on the load beam 320 and the pivot member 322 The flexible member 324. A cantilever tongue 338 (similar to FIG. 12 ) is provided on the flexible member 324 to cooperate with the small protrusion on the load beam 320 . The base plate 318 , the pivot member 322 , the load beam 320 and the flexible member 324 can be connected to each other by means such as welding.

The flexible cable cantilever assembly 300 includes a cantilever flexible cable 302 having an insulating layer 304 . The inner and outer cantilever wires 326 , 327 are integrated on the insulating layer 304 by laminating, for example. One end of the inner cantilever wire 326 is electrically connected to a plurality of connection contacts 340 (which are connected to an external control system), and the other end is electrically connected to a connection contact 344 (which is connected to the magnetic head 314 ). At the same time, one end of the outer cantilever wire 327 is electrically connected to the connection contact 340 (which is connected to the external control system), and the other end is electrically connected to the connection contact 348 (which is connected to the piezoelectric micro-driver 342 ). .

The flexible cable frame assembly 355 includes a micro-drive frame body 352 and a frame flexible cable 357 . The micro-drive frame 352 is similar to the micro-drive frame 252 , and also includes a top support plate 354 , a bottom support plate 356 , a side arm 358 and a connecting contact support plate 360 . A piezoelectric element 342 is mounted on each side arm 358 .

The frame flex cable 357 includes an insulating layer 361 having a top 363 and a bottom 365 . The wire 366 is integrated in the insulating layer 361 and has an extension 394 such as a long-tail guide plate. Head connection contacts 364 , such as four head connection contacts, are formed on the top portion 363 ; cantilever connection contacts 346 , such as four cantilever connection contacts, are formed on the extension portion 394 . In one embodiment, the cantilever connecting contact 346 is a double-sided exposed copper terminal. The magnetic head connecting contact 364 is electrically connected to the cantilever connecting contact 346 through a wire 366 on the insulating layer 361 .

The frame flex cable is formed by mounting the top 363 of the insulating layer 361 to the top support plate 354 of the microactuator frame 352 and the bottom 365 of the insulating layer 361 to the bottom support plate 356 of the microactuator frame 352. 357 is installed on the microdrive frame 352. The insulating layer 361 can be installed on the micro-actuator frame 352 by means of epoxy glue, adhesive or anisotropic conductive film, for example.

As shown in FIGS. 19-20 , the cantilever flexible cable 302 is mounted on the flexible member 324 on the cantilever 316 by means of eg epoxy glue or adhesive. As shown in FIG. 18 , the cantilever flex cable 302 includes a tongue portion 306 supported by a cantilever tongue 338 of a flexure 324 .

The bottom support plate 356 of the micro-actuator frame 352 is mounted on the cantilever tongue 338 of the flexible member 324 and the tongue portion 306 of the cantilever flexible cable 302 by means of eg epoxy glue or adhesive. The cantilever connecting contact 346 of the flexible cable 357 is electrically connected to the corresponding connecting contact 344 on the cantilever flexible cable 302 by means of, for example, ultrasonic connection or anisotropic conductive film connection. This connects the bottom support plate 356 to the cantilever 316 and electrically connects the flex cable 357 to the inner cantilever wire 326 .

The top support plate 354 of the micro-actuator frame 352 and the top 363 of the flexible cable 357 jointly connect the piezoelectric micro-actuator 312 to the magnetic head 314 . Specifically, the top support plate 354 and the top 363 jointly support the magnetic head 314 thereon, and the magnetic head connection contacts 364 on the frame flexible cable 357 and the corresponding connection contacts 368 on the magnetic head 314 are connected by means of, for example, electrical connection balls 370 (GBB or SBB) electrical connections (refer to Figure 20). Thus, the piezoelectric micro-actuator 312 is connected to the magnetic head 314 to form a magnetic head and piezoelectric micro-actuator combination 374 , and the magnetic head 314 and its read/write head are electrically connected to the inner cantilever wire 326 of the cantilever 316 .

The piezoelectric element 342 on the piezoelectric micro-actuator 312 is electrically connected to the outer cantilever wire 327 . Specifically, the connection contacts on the piezoelectric element 342 and the connection contacts 348 on the outer cantilever wire 327, such as two connection contacts, are electrically connected by means of an electrical connection ball 376 (GBB or SBB) (refer to FIG. 20 ). connect. Thus, a voltage is applied to the piezoelectric element 342 through the outer cantilever wire 327 .

Since the wire 366 is integrated on the frame flexible cable 357, the cantilever wires 326 and 327 are integrated in the cantilever flexible cable 302, and the connecting contact support plate 360 is integrated into the micro-driver frame 352, so when the piezoelectric micro-driver 312 works, These components do not generate unwanted vibrations. The performance of the disk drive is improved by reducing the vibration of the wires in the head gimbal assembly. In addition, since the above-mentioned integrated components are not easily deformed during the manufacturing process of the suspension arm, the HGA and the disk drive device, the yield rate of the product can be improved. In addition, the micro-actuator frame 352 , the cantilever 316 , the frame flexible cable 357 and the cantilever flexible cable 302 have a relatively simple structure and manufacturing process, which reduces product design and manufacturing costs.

FIG. 21 shows the main steps of the manufacturing and assembling process of the HGA described in another embodiment of the present invention. After the flow process starts (step 1 in Figure 21), the frame flexible cable is installed on the micro-driver frame (step 2 in Figure 21), and the frame flexible cable and the micro-drive frame can be as shown in Figure 18 to Figure 20 structure shown. Next, install the piezoelectric element on the side arm of the micro-actuator frame (step 3 in FIG. 21 ) to form a piezoelectric micro-actuator. Next, the cantilever flex cable is mounted to the flexible member of the cantilever (step 4 in FIG. 21 ). The cantilever flexible cable and the cantilever can have the structures shown in Fig. 18 to Fig. 20 . Next, install the micro-actuator frame of the piezoelectric micro-actuator on the cantilever by means such as welding (step 5 in FIG. 21 ). After the above installation is completed, the piezoelectric micro-actuator is electrically connected to the cantilever wire on the cantilever (step 6 in FIG. 21 ). Next, install the magnetic head on the piezoelectric micro-actuator (step 7 in FIG. 21 ), and electrically connect the magnetic head to the cantilever wire on the cantilever (step 8 in FIG. 21 ). Then, perform visual inspection on the head gimbal assembly (step 9 in FIG. 21 ), and test the magnetic head and piezoelectric performance (step 10 in FIG. 21 ). In the last step, the HGA is cleaned (step 11 in FIG. 21).

FIG. 22 illustrates a HGA 410 described in yet another embodiment of the present invention. In this embodiment, the cantilever flex cable 402 is integrated with the flexure 424 of the cantilever 416 . The rest of the structure of the HGA 410 is basically similar to the above-mentioned HGA 310 and denoted by similar reference numerals.

FIG. 23 illustrates a HGA 510 described in yet another embodiment of the present invention. In this embodiment, the piezoelectric microactuator 512 includes a frame flex cable 557 located on the back side of the microactuator frame 552 . As shown, an opening or window 590 is formed on the connecting contact support plate 560 to expose the magnetic head connecting contact 564 to connect with the magnetic head 214 . In this embodiment, the head connection contacts 564 are fly lead pads. Likewise, the anisotropic conductive film 592 or other suitable materials can also be used to mechanically and electrically connect the cantilever connecting contact 546 to the connecting contact 244 on the cantilever 216 . The rest of the structure of the HGA 510 is basically similar to the above-mentioned HGA 210 and denoted by similar reference numerals.

FIG. 24 illustrates a HGA 610 described in yet another embodiment of the present invention. In this embodiment, the piezoelectric microactuator 612 includes a frame flex cable 657 . The frame flex cable 657 has an extension 694 , such as a long tail guide, to facilitate connection with the cantilever 616 . Also, the frame flex cable 657 is located on the back side of the microdrive frame body 652 . As shown, the connection contact support plate 660 has an opening or window 690 therein to expose the head connection contacts 664 for connection to the magnetic head 314 . The rest of the structure of the HGA 610 is basically similar to the above-mentioned HGA 310 and denoted by similar reference numerals. It should be noted that the cantilever 616 includes a cantilever flexible cable 302 that may or may not be combined with a flexure 324 .

The head gimbal assembly with piezoelectric microactuator and suspension described in various embodiments of the present invention can be used in a hard disk drive (HDD). The disk drive can be of the type shown in FIG. 1 .

Since the structure, operation and assembly process of the disk drive device are well known to those skilled in the art, details will not be repeated here. The piezoelectric microactuator and cantilever can be used in any disk drive device having a piezoelectric microactuator and cantilever or other devices having a piezoelectric microactuator and cantilever. In one embodiment, the piezoelectric microactuator and cantilever are used in a disk drive with high rotational speed.

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 (26)

1. flexible cable frame combination that is used for magnetic head fold piece combination comprises:

The microdrive framework; And

Be installed in the flexible cable on this microdrive framework, wherein

This flexible cable comprises first group of connecting terminal being positioned at the one end, be positioned at second group of connecting terminal of its other end and be integrated on the described flexible cable, be used to connect the lead (trace) of above-mentioned two groups of connecting terminals.

2. flexible cable frame combination according to claim 1, it is characterized in that: described microdrive framework comprises the connecting terminal back up pad that is integrated in this microdrive framework, and this connecting terminal back up pad supports in described first group of connecting terminal and the second group of connecting terminal.

3. flexible cable frame combination according to claim 1, it is characterized in that: this microdrive framework comprises the connecting terminal back up pad that is integrated in this microdrive framework, and this connecting terminal back up pad is provided with at least one opening of one that is used for supporting and exposing described first group of connecting terminal and second group of connecting terminal.

4. flexible cable frame combination according to claim 1 is characterized in that: this microdrive framework comprises the end back up pad that is connected on the described magnetic head fold piece combination cantilever, support the top back up pad of described magnetic head fold piece combination magnetic head and connect described should end back up pad and a pair of side arm of top back up pad.

5. flexible cable frame combination according to claim 4, it is characterized in that further comprising the piezoelectric element that is installed on each side arm, each piezoelectric element can be excited and cause that the selectivity of side arm moves, and moving of described side arm can cause that top board moves, and then magnetic head is moved.

6. flexible cable frame combination according to claim 4, it is characterized in that: this flexible cable comprises the insulation course that contains at least one top and bottom, this top is installed on the top back up pad of described microdrive framework, and this bottom is installed on the end back up pad of described microdrive framework.

7. flexible cable frame combination according to claim 6 is characterized in that: described bottom comprises the cantilever connecting terminal, be used for described cantilever on corresponding connecting terminal electrically connect.

8. flexible cable frame combination according to claim 6 is characterized in that: described top comprises the magnetic head connecting terminal, be used for described magnetic head on corresponding connecting terminal electrically connect.

9. flexible cable frame combination according to claim 8 is characterized in that: described flexible cable is installed on the front surface of described microdrive framework, and this front surface is towards described magnetic head.

10. flexible cable frame combination according to claim 8 is characterized in that: described flexible cable is installed on the rear surface of microdrive framework, and this rear surface is said head dorsad.

11. flexible cable frame combination according to claim 10, it is characterized in that: described microdrive framework comprises the connecting terminal back up pad that is integrated in this microdrive framework, this connecting terminal back up pad has at least one and is used for opening that described magnetic head connecting terminal is come out, so that corresponding connecting terminal electrically connects on described magnetic head connecting terminal and the magnetic head.

12. flexible cable frame combination according to claim 6 is characterized in that further comprising being integrated in the bottom and from the extended extension in this bottom, this extension comprise with cantilever on the cantilever connecting terminal of corresponding connecting terminal electric connection.

13. flexible cable frame combination according to claim 12 is characterized in that: described flexible cable is installed on the front surface of described microdrive framework, and this front surface is towards said head.

14. flexible cable frame combination according to claim 12 is characterized in that: described flexible cable is installed on the rear surface of described microdrive framework, the described dorsad magnetic head in this rear surface.

15. flexible cable frame combination according to claim 14, it is characterized in that: this microdrive framework comprises the connecting terminal back up pad that is integrated in this microdrive framework, this connecting terminal back up pad has at least one and is used for opening that described magnetic head connecting terminal is come out, so that corresponding connecting terminal electrically connects on described magnetic head connecting terminal and the magnetic head.

16. a magnetic head fold piece combination comprises:

Contain the microdrive framework and be installed in the flexible cable frame combination of the framework flexible cable on this microdrive framework;

Magnetic head; And

Support the cantilever of above-mentioned flexible cable frame combination and magnetic head, this cantilever comprises a flexible cable cantilever combination that contains the cantilever flexible element and be installed on the flexible cable on this flexible element.

17. magnetic head fold piece combination according to claim 16 is characterized in that: this framework flexible cable comprises first group of connecting terminal being positioned at the one end, be positioned at second group of connecting terminal of its other end and be integrated on the described flexible cable, be used to connect the lead of above-mentioned two groups of connecting terminals.

18. magnetic head fold piece combination according to claim 17 is characterized in that: this microdrive framework comprises the end back up pad that is connected on the cantilever, support the top back up pad of magnetic head and connect a pair of side arm of this end back up pad and top back up pad.

19. magnetic head fold piece combination according to claim 18, it is characterized in that further comprising the piezoelectric element that is installed on each side arm, each piezoelectric element can be excited and cause that the selectivity of side arm moves, and moving of described side arm can cause that top board moves, and then magnetic head is moved.

20. magnetic head fold piece combination according to claim 18, it is characterized in that: this flexible cable comprises the insulation course that contains at least one top and bottom, this top is installed on the top back up pad of described microdrive framework, and this bottom is installed on the end back up pad of described microdrive framework.

21. magnetic head fold piece combination according to claim 20 is characterized in that: described bottom comprises the cantilever connecting terminal, be used for described cantilever on corresponding connecting terminal electrically connect.

22. magnetic head fold piece combination according to claim 20 is characterized in that: described top comprises the magnetic head connecting terminal, be used for described magnetic head on corresponding connecting terminal electrically connect.

23. magnetic head fold piece combination according to claim 16 is characterized in that: described cantilever flexible cable comprises insulation course and is integrated in cantilever lead on this insulation course that described cantilever lead and the connecting terminal that is used for being connected with external control system electrically connect.

24. a disk drive comprises:

Magnetic head fold piece combination; Described magnetic head fold piece combination comprises flexible cable frame combination, magnetic head and supports the cantilever of described flexible cable frame combination and magnetic head;

Connect actuating arm with described magnetic head fold piece combination;

Disk; And

The Spindle Motor of rotatable this disk, wherein

Described flexible cable frame combination comprises:

The microdrive framework; And

Be installed on the flexible cable on this microdrive framework, wherein

This flexible cable comprises first group of connecting terminal being positioned at the one end, be positioned at second group of connecting terminal of its other end and be integrated on the described flexible cable, be used to connect the lead (trace) of above-mentioned two groups of connecting terminals.

25. a method of making magnetic head fold piece combination comprises:

The microdrive framework is provided;

The framework flexible cable is installed on described microdrive framework, and wherein this framework flexible cable comprises first and second group connecting terminal and with above-mentioned two groups of integral wires that connecting terminal couples together;

Piezoelectric element is installed on the described microdrive framework;

This microdrive framework is installed on the cantilever;

Cantilever lead on described piezoelectric element and the cantilever is electrically connected;

Magnetic head is installed on the described microdrive framework;

Cantilever lead on described magnetic head and the cantilever is electrically connected;

Carry out visual examination;

Test magnetic head and piezoelectric property; And

Clean.

26. manufacture method according to claim 25 is characterized in that further comprising the step that a cantilever flexible cable is installed on the described cantilever with the integrated cantilever lead that links to each other with external control system.

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