KR20080005142A - Head gimbal assembly with micro-actuator assembly and amplifier, hard disk drive having the same, and method of operating head gimbal assembly - Google Patents

Abstract

A head gimbal assembly with a micro-actuator assembly and an amplifier, a hard disk drive having the same, and a method of operating the head gimbal assembly are provided to secure an amplified read signal of a read head in a slider, to position a read-write head minutely, and to simplify the configuration of the assembly. A head gimbal assembly of a hard disk drive comprises a slider(90), a micro-actuator assembly(80), a flexure finger(20), and first and second power paths(SP1P,SP2P). The slider includes read-write heads(94-R,94-W), and an amplifier(96) for receiving read differential signals(r0) and generating the amplified read signal. The micro-actuator assembly is assembled with the slider to contribute the read-write heads to be positioned. The flexure finger is assembled with the slider and with the micro-actuator assembly. The first and second power paths are provided by the flexure finger and shared to supply the electric power to both slider and the micro-actuator assembly. The slider has first and second slider power terminals(SP1,SP2) for providing the amplifier with the power. The micro-actuator assembly has first and second micro-actuator power terminals(82P1,82P2).

Description

Head gimbal assembly with micro-actuator assembly and amplifier, hard disk drive having the same, and method of operating head gimbal assembly}

The present invention relates to a hard disk drive, and more particularly to a head gimbal assembly having a micro-actuator assembly for positioning of a read-write head and an amplifier for amplifying a read signal, and a hard disk drive and a head gimbal assembly having the same. It's about how it works.

Conventional hard disk drives include an actuator assembly that rotates through an actuator pivot to position one or more read-write heads embedded in the slider over the surface of each rotating disk. Data stored on the surface of the rotating disk is typically arranged in concentric tracks. To access the data on the track, the servo controller first positions the read-write head by electrically stimulating the voice coil motor, which is coupled with the actuator arm through the voice coil to move the head gimbal assembly to move the slider. Position near the track. When the read-write head is near the track, the servo controller typically commands the read-write head to follow the track, and the read-write head has access to the data stored in the track.

The micro-actuator provides a secondary drive stage for laterally positioning the read-write head while following the track. They often use electrostatic and / or piezoelectric effects to quickly produce minute positional changes. They double the bandwidth of the servo controller and are now recognized as essential for high capacity hard disk drives.

The main concern of the hard disk drive industry is to further increase data storage density. For this purpose, the track width and the size of the read head in the read-write head are continuously decreasing. As the read head size decreases, the read signal generated from the read head is also gradually weakened. Conventional hard disk drives have a preamplifier located within the actuator assembly, but the weak read signal from the read head must undergo severe resistance from the slider to the preamplifier, so the read signal reaching the preamplifier is weaker and amplified in the preamplifier. Even if there is a limit. .

Therefore, a mechanism is needed to amplify the read signal before the read head of the read head leaves the slider.

The present invention has been made to solve the above problems of the prior art, in particular a head gimbal having a micro-actuator assembly for positioning of the read-write head and an amplifier for amplifying the read signal and having a power path for them shared. It is an object of the present invention to provide an assembly and a hard disk drive having the same.

It is another object of the present invention to provide a method of operating the head gimbal assembly.

The head gimbal assembly of the hard disk drive according to the present invention for achieving the above technical problem,

A slider comprising a read-write head for accessing data on the surface of the disc, and an amplifier receiving a read differential signal pair from the read-write head and generating an amplified read signal;

A micro-actuator assembly coupled to the slider and contributing to positioning the read-write head to access data on the disk surface;

A flexure finger coupled to the slider and micro-actuator assembly; And

A first power path and a second power path shared by the flexure finger to provide electrical power to both the slider and the micro-actuator assembly.

In the present invention, the slider has a first slider power terminal and a second slider power terminal for providing power to the amplifier; The micro-actuator assembly has a first micro-actuator power terminal and a second micro-actuator power terminal for providing power to the micro-actuator assembly; The first power path is electrically connected to the first slider power terminal and the first micro-actuator power terminal, and the second power path is electrically connected to the second slider power terminal and the second micro-actuator power terminal. Can be connected.

In the present invention, the read-write head may include a read head for driving the read differential signal pair and a write head for receiving a write differential signal pair.

In the present invention, the read head may use any one selected from the group consisting of a spin valve and a tunneling valve for driving the read differential signal pair.

In the present invention, the flexure finger may further provide a read trace path for the amplified read signal.

In the present invention, the amplifier is preferably located on the opposite side of the air bearing surface of the slider.

In the present invention, the micro-actuator assembly can contribute to positioning the read-write head laterally or vertically.

In the present invention, the micro-actuator assembly may employ any one selected from the group consisting of a piezoelectric effect and an electrostatic effect in order to contribute to positioning the read-write head.

In the present invention, the slider may further comprise a vertical micro-actuator for adjusting the vertical position of the read-write head relative to the surface of the disc.

The head gimbal assembly according to the present invention may further include a load beam coupled to the slider via the flexure finger. In this case, the first power path of the flexure finger may be electrically connected to the load beam.

In addition, the hard disk drive according to the present invention for achieving the above technical problem,

A head stack assembly comprising a head gimbal assembly having the above configuration and a main flex circuit coupled to the flexure finger and having a preamplifier configured to generate a read signal based on the amplified read signal; And

And an integrated circuit electrically connected to the main flex circuit to process the read signal.

In addition, the method for operating the head gimbal assembly according to the present invention for achieving the above technical problem,

Providing electrical power to the micro-actuator assembly and the amplifier via the first and second power paths;

The micro-actuator assembly positioning the slider on a disk surface;

The slider reading access to data on a disk surface; And

And reporting the read signal amplified by the amplifier as a result of the read access to the data on the disk surface by the slider.

In the present invention, the step of reporting the read signal amplified by the slider,

The read-write head of the slider driving a read differential signal pair; And

And receiving, by the amplifier included in the slider, the read differential signal pair to generate the amplified read signal.

As described above, according to the present invention, since an amplifier is provided in the slider of the head gimbal assembly, and the micro-actuator assembly is coupled to the slider, an amplified read signal of the read head can be obtained in the slider, and the read-write Finer positioning of the head has the effect of being possible. And, because the power paths for the micro-actuator assembly and the amplifier are shared, the configuration has a simple advantage.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the following drawings indicate like elements.

1A and 1B, the head gimbal assembly 60 according to the present invention includes a flexure finger 20 and a slider 90 coupled to the flexure finger 20. The flexure finger 20 provides a read trace path (rtp) electrically connected to the amplified read signal ar0.

As shown in FIG. 1A, the slider 90 includes a read-write head 94 and a read signal amplified by receiving a read differential signal pair r0 provided from the read-write head 94. It further includes an amplifier 96 for generating (ar0). The read-write head 94 preferably includes a read head 94-R for driving a read differential signal pair r0 and a write head 94-W for receiving a write differential signal pair w0. Do. As shown in FIG. 2A, the slider 90 is used to access data on the surface of the disk 12 in the hard disk drive 10. The data is typically organized in a unit known as the track 122, which may be organized into spiral tracks arranged or connected concentrically on the surface of the disk 12 centered with respect to the spindle shaft 40. When the slider 90 is operated to access data on the surface of the rotating disk 12, the read head 94-R drives the read differential signal pair r0 to rotate the data on the surface of the rotating disk 12. The amplifier 96 receives a read differential signal pair r0 to generate an amplified read signal ar0. The slider 90 reports the amplified read signal ar0 as a result of the read access of data on the surface of the rotating disk 12.

As shown in FIGS. 8B-8D and 9C, the amplifier 96 is preferably on the opposite side of the air bearing face 92. Meanwhile, as shown in FIG. 8E, the amplifier 96 may be on the side of the slider 90.

The head gimbal assembly 60 operates as follows when reading access to data organized on the surface of the rotating disk 12, preferably organized as a track 122. As noted above, the slider 90 reports the amplified read signal ar0 as a result of the read access. The flexure finger 20 transmits the amplified read signal ar0 through the read trace path rtp.

The slider 90 may further include a first slider power terminal SP1 and a second slider power terminal SP2, both of which are electrically connected to the amplifier 96 to generate an amplified read signal ar0. To provide power. The flexure finger 20 is electrically connected to the first power path SP1P and the second slider power terminal SP2 that are electrically connected to the first slider power terminal SP1 as shown in FIG. 1A. A second power path SP2P is further included, which are used to provide electrical power to generate the read signal ar0 amplified together.

The head gimbal assembly 60 further includes a micro-actuator assembly 80 mechanically coupled to the slider 90 to help position the slider 90 to access data on the surface of the rotating disk 12. Include. The micro-actuator assembly 80 includes a first micro-actuator power terminal 82P1 and a second micro-actuator power terminal 82P2. The first micro-actuator power terminal 82P1 is electrically connected to the first power path SP1P, and the second micro-actuator power terminal 82P2 is electrically connected to the second power path SP2P. do.

As described above, the first power path SP1P and the second power path SP2P provided by the flexure finger 20 provide electrical power to both the amplifier 96 and the micro-actuator assembly 80. Is shared to provide.

The method of operating the head gimbal assembly 60 includes operating the micro-actuator assembly 80 to assist in positioning the slider 90 to read access to data on the surface of the rotating disk 12. Preferably, this step comprises the electrical power shared by the micro-actuator assembly 80 and the amplifier 96 to position the slider 90 and to assist the amplifier 96 to generate an amplified read signal ar0. Providing a step.

As shown in FIGS. 1B, 4B and 11A, the flexure finger 20 may be coupled to the load beam 74, and the first power path SP1P of the flexure finger 20 may be a load beam ( 74 is electrically connected to the metal part. In some embodiments, the metal portion may be essentially the entirety of the load beam 74.

As shown in FIG. 1B, the head gimbal assembly 60 includes a base plate 72 coupled to the load beam 74 via a hinge 70. The flexure finger 20 is coupled to the load beam 74 and the micro-actuator assembly 80 and the slider 90 are coupled to the head gimbal assembly 60 through the flexure finger 20.

The method of manufacturing the head gimbal assembly 60 of the present invention includes coupling the flexure finger 20 to the slider 90 of the present invention, which is a read trace path rtp and an amplified read signal ar0. It further comprises electrically connecting). The present invention includes a method of making the head gimbal assembly 60 and a head gimbal assembly 60 as a product of the manufacturing method. The method of manufacturing the head gimbal assembly 60 may further include coupling the micro-actuator assembly 80 to the slider 90. Coupling the micro-actuator assembly 80 to the slider 90 may electrically connect the first micro-actuator power terminal 82P1 to the first power path SP1P and / or the second micro-actuator power. And electrically connecting the terminal 82P2 to the second power path SP2P.

The read head 94-R shown in FIG. 2A may use a spin valve as shown in FIG. 2B to drive the read differential signal pair r0. Here, the spin valve employs a magnetoresistive effect to generate a sensing current Is induced between the first shield (shield 1) and the second shield (shield 2). The spin valve has been used since the mid 1990s. An idealized and simplified cross-sectional view of the read-write head 94 using the spin valve is shown in FIG. 8A. 8B shows a simplified cross-sectional view of the slider 90 of the present invention.

As shown in FIG. 2C, the read head 94-R may use a tunneling valve to drive the read differential signal pair r0. Here, the tunneling valve modulates the sensing current Is perpendicular to the first shield (shield 1) and the second shield (shield 2) using the tunneling effect.

The signals recorded in the horizontal direction shown in FIG. 3E and the signals recorded in the vertical direction shown in FIG. 3F can be read by the read-head 94-R using a spin valve or a tunneling valve. Vertical to horizontal writing relates to the combination of the write head 94-W and the disk medium. This difference in the polarization of the bits in track 122 led to a large increase in data density, which increased nearly 200 percent in the spring of 2005.

The use of the tunnel valve is further described with reference to FIGS. 3C and 3D. The pinned magnetic layer is separated from the free ferromagnetic layer by an insulating layer and is bonded to the pinning antiferromagnetic layer. The magnetoresistance of the tunneling valve is caused by a change in the tunneling probability, which depends on the relative magnetic direction of the two ferromagnetic layers. The sensing current Is is the result of this tunneling probability. The response of the free layer to the magnetic field of the bits of the track 122 on the surface of the rotating disk 12 is manifested as a change in electrical resistance through the tunneling valve. 3c shows a low resistance response and FIG. 3d shows a high resistance response. 9A and 9B show a detailed structure of the read-write head 94 employing the above-mentioned tunneling valve, and FIG. 9C shows a slider 90 having a read-write head 94 employing the tunneling valve. A side view of) is shown for reference.

As shown in FIG. 3A, the amplified read signal ar0 may be implemented as an amplified read signal pair ar0 + −, or as one read signal shown in other figures. Although the amplified read signal ar0 is shown as one read signal in other figures, this is not intended to limit the scope of the present invention.

As shown in FIG. 3B, the slider 90 of the present invention further includes a first slider power terminal SP1 and a second slider power terminal SP2, which generate amplified read signals ar0. It is used together to drive the amplifier 96.

As shown in FIGS. 4B, 4C, 8C, and 8D, the slider 90 also provides a vertical micro-actuator 98 that allows the read-write head 94 to approach or move away from the surface of the disc 12. It may include. The vertical micro-actuator 98 may be a thermal actuator controlled by two electrical terminals. One of the two terminals is preferably shared with the first slider power terminal SP1. The other terminal is preferably connected to the vertical control signal VcAC, which may be desirable in the embodiment shown in FIG. 8C. Another form of vertical micro-actuator 98 mounted to the slider 90, such as the vertical micro-actuator 98 shown in FIG. 8D, may employ a piezoelectric actuator. If the vertical micro-actuator 98 is included in the slider 90, the materials directly bonded thereto tend to deform. Thus, the amplifier 96 is preferably not coupled directly to the vertical micro-actuator 98. Today, the read-write head 94 typically has five wires, two providing read differential signal pairs r0, two providing write differential signal pairs w0, and one signal. Provides a vertical control signal VcAC. The vertical micro-actuator 98 may preferably be grounded to the load beam 74 via flexure fingers 20 coupled to the load beam 74.

The method of manufacturing the slider 90 includes coupling the read-write head 94 to the amplifier 96, specifically connecting the read differential signal pair r0 to the amplifier 96 electrically. The present invention includes a method for producing the slider 90 and a slider 90 as a product of the method. The method of manufacturing the slider 90 includes providing an air bearing face 92 near the read head 94 -R and, in some embodiments, providing a vertical micro-actuator 98. .

Coupling the read-write head 94 to the amplifier 96 may be accomplished by bonding the amplifier 96 to the read head 94-R or by installing the amplifier 96 to the read head 94-R. Can be performed. Bonding the amplifier 96 may include bonding and / or welding and / or soldering the amplifier 96 to the read head 94 -R. Installing the amplifier 96 includes depositing an insulating material to create a signal conditioning base, and / or using a slider substrate as the signal conditioning base, and / or depositing a first semiconductor layer on the signal conditioning base. It may include doing. Installing the amplifier 96 is. To define at least one pattern, to etch the pattern at least once to produce at least one layer for at least one semiconductor material, and to form at least one transistor circuit implementing the amplifier 96 It may include forming at least one metal layer. The transistors used in the present invention preferably include, but are not limited to, bipolar transistors, field effect transistors (FETs), and amorphous transistors.

The micro-actuator assembly 80 may employ piezoelectric and / or electrostatic effects to assist in positioning the slider 90. In some embodiments of the present invention, it may be desirable for the micro-actuator assembly 80 to engage the head gimbal assembly 60 through the flexure finger 20, as shown in FIGS. 1B and 4B. . The micro-actuator assembly 80 may be coupled to the load beam 74, the head gimbal assembly 60 and the head stack assembly 50 via the flexure finger 20.

Examples of micro-actuator assemblies 80 employing piezoelectric effects are shown in FIGS. 4B, 10A and 10B. 4B shows a side view of the head gimbal assembly 60 with the micro actuator assembly 80 including at least one piezoelectric element PZ1 to assist in the lateral positioning LP of the slider 90. In some embodiments, the micro-actuator assembly 60 may consist of one piezoelectric element PZ1. FIG. 10A shows a micro-actuator assembly 80 comprising a first piezoelectric element PZ1 and a second piezoelectric element PZ2, both of which assist in the lateral positioning LP of the slider 90. It may be desirable. FIG. 10B shows a micro-actuator assembly 80 coupled to the slider 90 with a third piezoelectric element PZ3 to help position the slider 90 vertically on the surface of the disk 12. Shows a perspective view.

Examples of the invention using a micro-actuator assembly employing the electrostatic effect are shown in FIGS. 11A and 11B, which are extracted from the drawings of US Application No. 10 / 986,345. 11A shows a schematic side view of a micro-actuator assembly 80 that couples to the flexure finger 20 through the micro-actuator mounting plate 700. FIG. 11B shows an electrostatic micro-actuator assembly 2000 that includes a first electrostatic micro-actuator 220 to assist in the lateral positioning LP of the slider 90. The electrostatic micro-actuator assembly 2000 may further include a second electrostatic micro-actuator 520 to assist in the vertical positioning VP of the slider 90.

The first electrostatic micro-actuator 220 includes a first pivot spring pair 402 and 408 coupled to the first stator 230 and a second pivot spring pair 400 and 406 coupled to the second stator 250. ), First flexure spring pair 410, 416 and second flexure spring pair 412, 418 coupled to center movable section 300, and pitch spring pair 420 coupled to center movable section 300. , 422). The center movable section 300 includes a signal pair path coupled to the amplified read signal ar0 and the write differential signal pair w0 of the read-write head 94 of the slider 90.

The bonding block 210 preferably electrically couples the read-write head 90 to the amplified read signal ar0 and the write differential signal pair w0, and the center movable section 300 to the air bearing face 92. Mechanically couples to a slider 90 having a read-write head 94 embedded on or near).

The first electrostatic micro-actuator 220 assists in the lateral positioning LP of the slider 90, which is a read-write head over a small number of tracks 122 on the surface of the rotating disk 12. Can be finally controlled to position 94. This lateral motion is a first degree of mechanical freedom, which originates from the first stator 230 and the second stator 250 which electrostatically interact with the central actuating section 300. The first electrostatic micro-actuator 220 may act as a lateral comb drive or a lateral comb driver as described in detail in the above-mentioned US patent application.

The electrostatic micro-actuator assembly 2000 may further include a second electrostatic micro-actuator 520 that includes a third stator 510 and a fourth stator 550. Both the third and fourth stators 510, 550 electrostatically interact with the central movable section 300. This interaction allows the slider 90 to move in a second mechanical degree of freedom and assists in vertical positioning VP to provide control of the aircraft. The second electrostatic micro-actuator 520 may act as a vertical comb drive or torsional drive as described in detail in the above-mentioned US patent application. The second electrostatic micro-actuator 520 may also provide motion sensing, which may indicate a collision with the surface of the rotating disk 120 being accessed.

The center movable section 300 not only positions the read-write head 90 but also amplifies the read signal ar0, the write differential signal pair w0, and in some embodiments, the first slider power terminal SP1 and the first slider power terminal SP1. 2 Passage for slider power terminal SP2. Electrical stimulation of the first electrostatic micro-actuator 220 is provided through some of its springs.

The center movable section 300 may preferably be at ground potential, so no wire is required. The read differential signal pair r0, the write differential signal pair w0 and the slider power terminals SP1, SP2 are preferably arranged with flexible traces all the way up to the load beam 74 as shown in FIG. 11A.

As shown in FIG. 1A, the present invention includes a flexure finger 20 for a slider 90, the flexure finger 20 having a read trace path rtp for an amplified read signal ar0. ). The lateral control signal 82 preferably includes the AC lateral control signal 82AC as well as the first lateral control signal 82P1 and the second lateral control signal 82P2. The flexure finger 20 engages a micro-actuator assembly 80 mechanically coupled with the slider 90 to help position the slider 90 to access data on the surface of the rotating disk 12. It may include. The micro-actuator assembly 80 may help lateral positioning LP of the slider 90 on the surface of the rotating disk 12 as shown in FIG. 4A, and also shown in FIG. 5. As shown, it may help to vertically position the slider 90 (VP).

As shown in FIGS. 5 and 6, the present invention includes a head stack assembly 50 having at least one head gimbal assembly 60 coupled to the head stack 54. The head stack assembly 50 operates as follows when reading access to data, organized on the surface of the rotating disk 12, preferably organized as tracks 122. The slider 90 reports the amplified read signal ar0 as a result of the read access. The flexure finger 20 provides a read trace path (rtp) for the amplified read signal ar0, as shown in FIG. 1A. The main flex circuit 200 receives the amplified read signal ar0 from the read trace path rtp and generates a read signal 25 -R.

The head stack assembly 50 may include one or more head gimbal assemblies 60 coupled to the head stack 54. For example, FIG. 6 shows the head stack assembly 50 coupled with the second head gimbal assembly 60-2, the third head gimbal assembly 60-3, and the fourth head gimbal assembly 60-4. . Moreover, the head stack 54 shown in FIG. 5 includes an actuator arm 52 coupled to the head gimbal assembly 60. In FIG. 6, the head stack 54 further includes a second actuator arm 52-2 and a third actuator arm 52-3, wherein the second actuator arm 52-2 has a second head gimbal assembly. 60-2 and the third head gimbal assembly 60-3, and the third actuator arm 52-3 is coupled to the fourth head gimbal assembly 60-4. The second head gimbal assembly 60-2 includes a second slider 90-2, which has a second read-write head 94-2. The third head gimbal assembly 60-3 includes a third slider 90-3, which has a third read-write head 94-3. And the fourth head gimbal assembly 60-4 includes a fourth slider 90-4, which has a fourth read-write head 94-4.

The head stack assembly 50 may include a main flex circuit 200 coupled with the flexure finger 20, which amplifies as a result of read access to the track 122 on the surface of the rotating disk 12. And a preamplifier 24 electrically connected to a read trace path rtp in the read-write signal bundle rw to generate the read signal 25 -R based on the read signal ar0. .

The method of manufacturing the head stack assembly 50 of the present invention includes coupling the at least one head gimbal assembly 60 of the present invention to the head stack 54. The manufacturing method may further include coupling one or more head gimbal assemblies 60 to the head stack 54. The manufacturing method may preferably further comprise coupling the main flex circuit 220 to the flexure finger 20, which is the result of a read access to data on the surface of the rotating disk 12. And electrically connecting the preamplifier 24 to the read trace path (rtp) to provide 25R). The present invention includes a method of making the head stack assembly 50 and a head stack assembly 50 as a product of the manufacturing method. Coupling the head gimbal assembly 50 to the head stack 54 may preferably be carried out by swaging the base plate 72 to the actuator arm 52.

The present invention comprises the hard disk drive 10 shown in FIGS. 2A, 4A, 5, 6, and 7, which hard disk drive 10 is preferably on the surface of the rotating disk 12, preferably a track. And a head stack assembly 50 electrically connected to embedded circuitry 500 for processing read signals 25 -R during read access to data organized in 122. The hard disk drive 10 operates as follows when reading access to data on the surface of the rotating disk 12. The slider 90 reports the amplified read signal ar0 as a result of the read access. The flexure finger 20 provides a read signal path (rtp) for the amplified read signal ar0, as shown in FIG. 1B. The embedded circuit 500 receives the read signal 25R and reads data on the rotating disk 12 surface.

As described above, the slider 90 reporting the amplified read signal ar0 drives the read head 94-R to drive a read differential signal pair r0 in reading data on the surface of the rotating disk 12. And an amplifier 96 that receives the read differential signal pair r0 and generates an amplified read signal ar0.

The hard disk drive 10 may include a servo controller 600 included in an embedded circuit 500, which is coupled to the voice coil motor 18 to form a micro-actuator assembly 80. By providing a read signal 25R based on the micro-actuator stimulus signal 650 that drives the < RTI ID = 0.0 > and < / RTI > A position error signal 260 is generated.

The embedded circuit 500 preferably includes a servo controller 600 that includes a servo computer 610 that is accessiblely coupled to the memory 620, as shown in FIG. 5. The program system 1000 may instruct the servo computer 610 in performing a method of operating the hard disk drive 10. The program system 1000 preferably includes at least one program step stored in the memory 620. The embedded circuit 500 may preferably be implemented in printed circuit technology. Lateral control signal 82 is preferably generated by micro-actuator driver 28. The lateral control signal 82 preferably includes an AC lateral control signal 82AC as well as a first lateral control signal 82P1 and a second lateral control signal 82P2.

The voice coil driver 30 preferably stimulates the voice coil motor 18 via the voice coil 32 to coarse positioning of the slider 90, in particular the track 122 on the surface of the rotating disk 12. Provide positioning of the read head 94-R in close proximity.

Here, the computer may include at least one instruction processor and at least one data processor, each of which is instructed by at least one instruction processor.

The method of manufacturing the hard disk drive 10 utilizes the head stack assembly 50 of the present invention to provide a read signal 25-R as a result of a read access of data on the surface of the rotating disk 12. Electrical coupling to embedded circuitry 500. The present invention includes a hard disk drive 10 manufacturing method and a hard disk drive 10 as a product of the manufacturing method.

The method of manufacturing the hard disk drive 10 includes coupling the servo controller 600 and / or the embedded circuit 500 to the voice coil motor 18 and the micro-actuator to drive the micro-actuator assembly 80. It may further comprise providing an actuator stimulus signal 650.

The method of manufacturing the servo controller 600 and / or the embedded circuit 500 may include programming the memory 620 into the program system 1000, preferably programming the nonvolatile memory elements. .

The method of manufacturing the embedded circuit 500 and / or the servo controller 600 includes installing the servo computer 610 and the memory 620 in the servo controller 600, and installing the memory 620 in the servo controller 600. Programming with the program system 1000.

Referring to the detailed view of FIG. 6, the hard disk drive 10 may include a disk 12 and a second disk 12-2. The disk 12 includes a first disk surface 120-1 and a second disk surface 120-2. The second disk 12-2 includes a third disk surface 120-3 and a fourth disk surface 120-4. The voice coil motor 18 responds to the voice coil 32 mounted on the head stack 54 that interacts with a fixed magnet 34 mounted on the disk base 14. And a head stack assembly 50 that rotates through an actuator pivot 58 mounted thereon. The head stack assembly 50 includes a head stack 54 having at least one actuator arm 52 coupled to a slider 90 that includes a read-write head 94. The slider 90 is coupled to the micro-actuator assembly 80.

The read-write head 94 is often connected via a preamplifier 24 on the main flex circuit 200 using a read-write signal bundle rw provided by the flexure finger 20. Interface to a channel interface 26 located within 600. The channel interface 26 often provides a position error signal 260 (PES) in the servo controller 600. When the hard disk drive 10 includes one or more micro-actuator assemblies 80, the micro-actuator stimulus signal 650 is preferably shared. More preferably, the lateral control signal 82 is also shared. Typically, each read-write head 94 typically interfaces with the preamplifier 24 using separate read and write signals provided by separate flexure fingers 20. For example, the second read-write head 94-2 is through the second flexure finger 20-2, and the third read-write head 94-3 is the third flexure finger 20-3. The fourth read-write head 94-4 interfaces with the preamplifier 24 through the fourth flexure finger 20-4.

During normal disk access operation, the embedded circuit 500 and / or servo controller 600 instructs the spindle motor 270 to rotate the spindle axis 40. This rotation is very stable and provides a nearly constant rotational speed to at least one, sometimes more than one, disk 12, 12-2 through the spindle axis 40. Rotation of the disks 12, 12-2 creates the surface of the rotating disks 12, 12-2 to access the tracks 122 during track access. Such access typically provides for track reading and / or track writing.

Those skilled in the art will recognize that various applications and modifications to the described preferred embodiments can be made without departing from the scope and spirit of the invention. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.

1a and 1b show a head gimbal assembly according to the invention;

2A shows a schematic diagram of the slider shown in FIG. 1A;

2B shows an example of the read head of FIG. 2A employing a spin valve;

2C shows an example of the read head of FIG. 2A employing a tunneling valve;

3A and 3B show partial details of FIG. 2A;

3C and 3D show the operation of the tunneling valve of FIG. 2C in detail;

3E shows a typical polarization of the bits in the track on the disk surface where the spin valve of FIG. 2B was used;

3f shows a typical polarization of the bits in the track on the disk surface where the tunneling valve of FIG. 2c was used;

4A shows the hard disk drive of FIGS. 1A and 2A partially assembled;

4B shows a head gimbal assembly including the slider of FIG. 2A coupled with a micro-actuator assembly using a piezoelectric effect;

4c shows a head gimbal assembly according to the invention further comprising a vertical micro-actuator;

5-7 show detailed views of the hard disk drive of FIGS. 1A, 2A, and 4A;

8A shows a detailed view of a read-write head using the spin valve of FIG. 2B;

8B-8E show details of sliders employing the spin valves of FIGS. 2B and 8A or the tunneling valves of FIGS. 2C, 9A and 9B;

9a and 9b show detailed views of a read-write head employing a tunneling valve;

9c shows a detailed view of a slider employing a tunneling valve;

10A and 10B show an example of using piezoelectric effects in the micro-actuator assembly for the head gimbal assembly of FIG. 1A;

11A and 11B show an example of using the electrostatic effect in the micro-actuator assembly for the head gimbal assembly of FIG. 1A.

Claims (15)

In the head gimbal assembly of a hard disk drive, A slider comprising a read-write head for accessing data on the surface of the disc, and an amplifier receiving a read differential signal pair from the read-write head and generating an amplified read signal; A micro-actuator assembly coupled to the slider and contributing to positioning the read-write head to access data on the disk surface; A flexure finger coupled to the slider and micro-actuator assembly; And A head gimbal of a hard disk drive provided by the flexure finger, having a shared first power path and a second power path for providing electrical power to both the slider and the micro-actuator assembly. Assembly. The method of claim 1, The slider has a first slider power terminal and a second slider power terminal for providing power to the amplifier; The micro-actuator assembly has a first micro-actuator power terminal and a second micro-actuator power terminal for providing power to the micro-actuator assembly; The first power path is electrically connected to the first slider power terminal and the first micro-actuator power terminal, and the second power path is electrically connected to the second slider power terminal and the second micro-actuator power terminal. Head gimbal assembly of the hard disk drive, characterized in that connected to. The method of claim 1, And the read-write head includes a read head for driving the read differential signal pair and a write head for receiving a write differential signal pair. The method of claim 3, wherein And the read head uses any one selected from the group consisting of a spin valve and a tunneling valve for driving the read differential signal pair. The method of claim 1, And the flexure finger further provides a read trace path for the amplified read signal. The method of claim 1, And the amplifier is located opposite the air bearing surface of the slider. The method of claim 1, And said micro-actuator assembly contributes to the lateral positioning of said read-write head. The method of claim 7, wherein And said micro-actuator assembly further contributes to positioning said read-write head in a vertical direction. The method of claim 1, And the micro-actuator assembly employs any one selected from the group consisting of piezoelectric and electrostatic effects to contribute to positioning the read-write head. The method of claim 1, And the slider further comprises a vertical micro-actuator for adjusting the vertical position of the read-write head relative to the surface of the disk. The method of claim 1, And a load beam coupled to the slider via the flexure finger. The method of claim 11, And the first power path of the flexure finger is electrically connected to the load beam. In the hard disk drive, A head stack assembly comprising a head gimbal assembly of claim 1 and a main flex circuit having a preamplifier coupled with the flexure finger and generating a read signal based on the amplified read signal; And And an integrated circuit electrically connected to the main flex circuit to process the read signal. 13. A method of operating the head gimbal assembly of any of claims 1-12. Providing electrical power to the micro-actuator assembly and the amplifier via the first and second power paths; The micro-actuator assembly positioning the slider on a disk surface; The slider reading access to data on a disk surface; And Reporting the read signal amplified by the amplifier as a result of the read access to data on the disk surface by the slider. 15. The method of claim 14, wherein reporting the read signal amplified by the slider comprises: The read-write head of the slider driving a read differential signal pair; And And receiving, by the amplifier included in the slider, the read differential signal pair to generate the amplified read signal.

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