CN1758342A - Magnetic head folding sheet assembly, magnetic disc driver and its flight altitude regulating method and system - Google Patents
Magnetic head folding sheet assembly, magnetic disc driver and its flight altitude regulating method and system Download PDFInfo
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- CN1758342A CN1758342A CN 200410085301 CN200410085301A CN1758342A CN 1758342 A CN1758342 A CN 1758342A CN 200410085301 CN200410085301 CN 200410085301 CN 200410085301 A CN200410085301 A CN 200410085301A CN 1758342 A CN1758342 A CN 1758342A
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Abstract
This invention discloses a head folding plate combination including a head, a cantilever unit for supporting the head, a flying height adjustment device for adjusting the flying height of the head and a flexible cable connecting the head and the adjustment device, in which, the adjustment device includes at least a piezoelectric plate set between the head and the cantilever, the combination further includes an anisotropic conductive film connecting the adjustment device, the cantilever unit and the cable. This invention also discloses a hardware drive structure using said combination and a system and a method for adjusting the flying height by it.
Description
Technical field
(flying height, FH) magnetic head fold piece combination of regulating power and disc driver also relate to the method and system of regulating flying height to the present invention relates to have good flying height.
Background technology
Data-storage system, disc driver for example, generally include and one or morely driven disk, and one or more flight is at magnetic disk surface and from the information stores head (being commonly referred to magnetic head) of magnetic disk surface read/write data message with certain speed rotation by Spindle Motor.Described magnetic head comprises a supporting surface over against magnetic disk surface, for example the air supporting surface (air bearing surface, ABS).When disk rotated, the air pressure between disk and air supporting surface increased, thereby has produced a lifting force, and this lifting force can make magnetic head rise and fly at magnetic disk surface.
As everyone knows, described each magnetic head all is contained on the cantilever (suspension), described cantilever by an actuating arm support (cantilever with magnetic head be called as magnetic head fold piece combination (head gimbal assembly, HGA).Described actuating arm removable and by voice coil motor (voice coil motor VCM) controls.Yet the flying height of magnetic head is owing to following reason very easily changes: 1. the outstanding at a high speed disk that changes; 2. the tolerance of magnetic head air supporting surface (tolerance); 3. the static posture of cantilever.And the variation of flying height has greatly influenced the performance of disc driver.That is, too high as flying height, will influence magnetic head and read or write data from disk; On the contrary, if flying height is low excessively, the disk of may swiping when magnetic head is subjected to impacting, thus damage magnetic head and/or disk.In current disk drive industry, quick increase along with the disc driver capacity, track pitch of disc driver (track pitch) and track width become more and more narrow, accordingly, the flying height of magnetic head becomes at the more and more end, like this, the dynamic fly height of control head becomes more and more important.
In order to satisfy above-mentioned needs, United States Patent (USP) the 5th, 611 discloses a kind of device that is used for the control head dynamic fly height No. 707.With reference to figure 1, disc driver comprises disk 100 and magnetic head fold piece combination 120, and wherein, described disk 100 is at a high speed around Spindle Motor 110 (spindle motor) rotation, and magnetic head fold piece combination 120 comprises a magnetic head in disk 100 surface flights.A flying height controller 130 that is used for the control head dynamic fly height is contained in magnetic head fold piece combination 120.With reference to figure 2, described flying height controller 130 comprises base 131 and movable aerodynamic force element 132.Described aerodynamic force element 132 can be along base 131 edge 135 rotations with movable aerodynamic force element 132.Described aerodynamic force element 132 can move to a release position vertical with base 131 from an off-position parallel with base 131.When in off-position, described flying height controller 130 does not influence the control of flying height.When in open position, flying height controller 130 will force down magnetic head fold piece combination 120, accordingly, reduce the flying height of magnetic head.
Yet the flying height adjustment capability of flying height controller 130 has a restriction, promptly can only reduce and can not increase flying height.And in fact, it is very necessary with the instability of compensation manufacturing magnetic head and magnetic head fold piece combination to increase flying height.In addition, because flying height controller 130 is installed on the magnetic head fold piece combination 120, so the weight of magnetic head fold piece combination will increase, and the increase of weight will greatly influence the performance of magnetic head fold piece combination 120, performance that for example resonates (resonance performance) and anti-seismic performance (shock performance).Simultaneously, because flying height controller 130 is away from magnetic head, so its adjustment precision is also quite limited.At last, because flying height controller 130 has the structure of a complexity, so its manufacture process quite wastes time and energy.
Therefore, provide a kind of have the magnetic head fold piece combination of fly-height adjustments device and comprise the disc driver of this combination very necessary with the shortcoming that overcomes prior art.
Summary of the invention
Based on the deficiencies in the prior art, fundamental purpose of the present invention is to provide a kind of and carries out magnetic head fold piece combination, the hard disk drive of good flying height adjustment and use it to carry out the method that flying height is adjusted.
Another object of the present invention is to provide a kind of magnetic head is carried out the system that dynamic fly height is adjusted.
In order to achieve the above object, the present invention has disclosed a kind of magnetic head fold piece combination (head gimbalassembly) and having comprised: magnetic head, be used to support magnetic head cantilever part, be used to adjust the fly-height adjustments device of magnetic head flight height (flyingheight); And be used to electrically connect the flexible cable of described magnetic head and fly-height adjustments device.In the present invention, described fly-height adjustments device comprises at least one piezoelectric patches that places between described magnetic head and cantilever part.Described magnetic head fold piece combination further comprise the anisotropic conductive film that is used for described fly-height adjustments device and described cantilever part are connected with flexible cable (anisotropic conductivefilm, ACF).
In the present invention, described piezoelectric patches is piezoelectric membrane sheet, piezoelectric ceramic piece or relaxation ferroelectric ceramic (PMN-Pt) piezoelectric patches, and it can be individual layer piezoelectric patches or multi-layer piezoelectric sheet.In one embodiment, described piezoelectric patches is bonded in the one or both sides in the cantilever tongue piece zone of cantilever part.In addition, form at least one slit in the cantilever tongue piece zone of cantilever part.
The aforementioned magnetic head fold piece combination of a kind of usefulness is adjusted the method for flying height, comprises the steps: (1) spinning disk, and disk is used for canned data; (2) read described information by magnetic head; (3) when disk rotates, excite piezoelectric patches with the height of control head with respect to disk.
A kind of hard disk drive of the present invention comprises: the disk and the magnetic head fold piece combination that are used for canned data.Described magnetic head fold piece combination comprises: the magnetic head that flies on disk, be used to support the cantilever part of magnetic head, the flexible cable that is used to adjust the fly-height adjustments device of magnetic head flight height (flying height) and is used to electrically connect described magnetic head and fly-height adjustments device.
The system of a kind of dynamic adjustment flying height of the present invention comprises: (1) servo-control system; Be used for the take-off location error signal (position error signal, PES) and be divided into two-way PES signal; (2) voice coil motor controller (VCM controller); Be used to receive one road PES signal and control voice coil motor driver (VCM driver), thereby drive voice coil motor and adjust head position; (3) flying height is adjusted counter; Be used to receive another road PES signal, and go out required flying height adjustment, export a driving voltage then by contrasting the needed calculated signals of described servo-control system; (4) piezoelectricity operation driver; Receive described driving voltage and it is put on the fly-height adjustments device to change the flying height of magnetic head.
Compared with prior art, at first,,, and do not worry the anti-seismic performance of magnetic head fold piece combination so it can alleviate the weight of magnetic head fold piece combination because the present invention need not provide the fly-height adjustments device of a complexity on magnetic head fold piece combination.In addition, other performance of magnetic head fold piece combination also can not be affected as resonance performance (resonance).
In addition, because fly-height adjustments device provided by the invention is a piezoelectric patches of being located under the magnetic head, can more accurately adjust the flying height of magnetic head.Moreover the present invention can mode as required adjusts the flying height of magnetic head.Obviously, also easier enforcement of the present invention and cost are lower.
For making the present invention easier to understand, further set forth the specific embodiment of magnetic head fold piece combination of the present invention, hard disk drive and flying height method of adjustment and system below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the stereographic map of traditional flying height control system;
Fig. 2 is the partial enlarged view of Fig. 1, to show traditional flying height controller;
Fig. 3 is the stereographic map of magnetic head fold piece combination of the present invention (magnetic head fold piece combination) first embodiment;
Fig. 4 is the local amplification decomposition figure of magnetic head fold piece combination among Fig. 3;
Fig. 5 is the part enlarged drawing after the magnetic head fold piece combination assembling among Fig. 3;
Fig. 6 is that magnetic head fold piece combination among Fig. 3 is at the cut-open view in microdrive zone;
Fig. 7 is the cut-open view of an embodiment of the piezoelectric patches of the present invention's use;
Fig. 8 is the cut-open view of another embodiment of piezoelectric patches used in the present invention;
Fig. 9 A-9C has showed three different duties of the employed piezoelectric patches of one embodiment of the invention;
Figure 10 A, 10B, 11A, 11B have showed two kinds of different voltages that are applied on the described piezoelectric patches;
Figure 12 A-12C has showed three different duties of the employed piezoelectric patches of another embodiment of the present invention;
Figure 13 has showed the contact between the flying height of magnetic head and the camber of magnetic head (camber);
Figure 14 is the local amplification decomposition figure of magnetic head fold piece combination second embodiment of the present invention;
Figure 15 is the partial view of the magnetic head fold piece combination after the assembling among Figure 14;
Figure 16 be among Figure 14 magnetic head fold piece combination at the cut-open view in microdrive zone;
Figure 17 is the stereographic map of magnetic head fold piece combination the 3rd embodiment of the present invention;
Figure 18 is the local amplification decomposition figure of magnetic head fold piece combination among Figure 17;
Figure 19 is the stereographic map of magnetic head fold piece combination the 4th embodiment of the present invention;
Figure 20 is the partial enlarged drawing of magnetic head fold piece combination among Figure 19;
Figure 21 is that magnetic head fold piece combination among Figure 19 is at the cut-open view in microdrive zone;
Figure 22 is the stereographic map of disc driver of the present invention;
Figure 23 is the system diagram of dynamic adjustments flying height of the present invention.
Embodiment
With reference to figure 3, according to first embodiment of the invention, a kind of magnetic head fold piece combination 2 comprises magnetic head 240, fly-height adjustments device and cantilever part 100.
With reference to figure 3 and 4, a side of magnetic head 240 is provided with plurality of electrodes contact 241.The fly-height adjustments device in fact is the piezoelectric patches 30 (PZT piece) that two ends are provided with two electrode contacts 301.Cantilever part 100 comprises load beam (load beam) 219, flexible element (flexure) 217, articulated part (hinge) 215 and substrate 213.As one embodiment of the invention, described flexible element 217 is connected with articulated part 215, load beam 219 and substrate 213 by laser bonding (laserwelding) mode.In this embodiment, load beam 219 is provided with small embossment 329 (see figure 6)s and stop means 511.Form two holes 201 and 203 on articulated part 215 and the substrate 213 respectively.Hole 201 is used for riveted (swaging) magnetic head fold piece combination 2 and actuating arm (not shown), and hole 203 then is used to alleviate the weight of cantilever part 100.With reference to figure 3 and 4, flexible element 217 1 ends are provided with plural connecting terminal 251 and are used for linking to each other with control system (not shown) equally, and the other end is provided with plural electrode contacts 351,361.Described connecting terminal 251 links to each other by plural cable 210 and electrode contacts 351,361.In the present embodiment, described flexible element 217 also comprises a cantilever tongue piece (suspension tongue) 328, described cantilever tongue piece sheet 328 is used to support magnetic head 240, and makes bearing capacity always put on the central area of magnetic head 240 by 329 (see figure 6)s of the kick on the load beam 219.In the present embodiment, the electrode contacts 301 on the corresponding piezoelectric patches 30, described cantilever tongue piece sheet 328 is provided with two electrode contacts 351.Simultaneously, the electrode contacts 241 on the corresponding magnetic head 240, cantilever tongue piece sheet 328 are provided with plural electrode contacts 361.
With reference to figure 7 and 8, in the present invention, described piezoelectric patches 30 can be individual layer piezoelectric patches 380 or multi-layer piezoelectric sheet 382.In one embodiment of the invention, described individual layer piezoelectric patches 380 comprises piezoelectric layer 373, two conductive layers 372 and two bottoms 371.Described piezoelectric layer 373 is clipped in 372 of two conductive layers.Two bottoms 371 are used for supporting and protection piezoelectric layer 373 and conductive layer 372.In the present invention, individual layer piezoelectric patches 380 can be the piezoelectric membrane sheet, piezoelectric ceramic piece or PMN-Pt piezoelectric patches.The thickness of piezoelectric layer 373 is 1-3 μ m, and the thickness of each conductive layer 372 is less than 1 μ m, and the thickness of bottom 371 is between 0.1 μ m is to several microns.Like this, the gross thickness of individual layer piezoelectric patches 380 will be extremely thin.In the present invention, multi-layer piezoelectric sheet 382 comprises that two or more individual layer piezoelectric patches 380 that connect together (not comprising bottom 371) reach in order to coat two bottoms 371 of described individual layer piezoelectric patches 380.Per two individual layer piezoelectric patches 380 of described multi-layer piezoelectric sheet 382 link together by epoxy glue or resin 383.Be appreciated that, above-mentioned way will increase the bending property (bending performance) of piezoelectric patches 30, thereby not only help to change the camber (camber, the curvature of magnetic head Width is called the magnetic head camber) of magnetic head, and make camber and the flying height of adjusting magnetic head be more prone to.In a preferred embodiment, the thickness of described epoxy glue or resin 383 is less than 5 μ m, and this will make piezoelectric patches 30 keep thin thickness and good adjustment performance.
Be formed at the rigidity that is used to reduce cantilever tongue piece 328 on the cantilever tongue piece 328 with reference to 4, two slits 218 of figure.When piezoelectric patches 30 was bent, this structure helped the flying height adjustment capability that obtains.Simultaneously, the stop 511 on corresponding load beam 219 on the cantilever tongue piece 328 is formed with an opening 512.Described stop 511 passes opening 512 and moves in order to the limit of crossing that stops cantilever tongue piece 328.
In this embodiment, with reference to figure 4, in assembling process, at first, piezoelectric patches 30 is bonded on the cantilever tongue piece 328 by ACF sheet 70, accordingly, two electrode contacts 351 on the cantilever tongue piece 328 are electrical connected with the electrode contacts 301 on the piezoelectric patches 30, electrically connect thereby set up between cantilever tongue piece 328 and piezoelectric patches 30.Then, magnetic head 240 is placed on the cantilever tongue piece 328, and like this, described piezoelectric patches 30 is clamped between magnetic head 240 and the cantilever tongue piece 328.In the present invention, magnetic head 240 partly is connected with cantilever tongue piece 328 by epoxy glue or tackifier 257 (see figure 6)s.Simultaneously, by with plural Metal Ball 501 (GBB or SBB; Gold goal welding or tin ball bonding connect) connect the electrode contacts 241 on electrode contacts 361 and the magnetic head 240 on the cantilever tongue piece 328, magnetic head 240 is electrical connected with cantilever tongue piece 328.Like this, magnetic head fold piece combination 2 has just formed, shown in Fig. 5 and 6.
Fig. 9 A-9C has described the principle of work of piezoelectric patches 30 in detail.When not having voltage to put on the piezoelectric patches 30, piezoelectric patches 30 is parked in its original position, and magnetic head 240 keeps its original shape, shown in Fig. 9 A.With reference to figure 10A and 11A, when positive direct-current voltages 411 puts on the piezoelectric patches 30 with positive polarization characteristic, the piezoelectric patches 30 with positive polarization characteristic will be bent because of weiss territory effect (Weiss domain effect).Then, shown in Fig. 9 B, because the piezoelectric patches 30 with positive polarization characteristic is clamped between magnetic head 240 and the cantilever tongue piece 328 and cantilever tongue piece 328 rigidity are low, like this, under the positive role (positive action) of the piezoelectric patches 30 with positive polarization characteristic, the profile of magnetic head 240 (being mainly the magnetic head camber) will become positive attitude.On the contrary, with reference to figure 11B, when negative dc voltage 411a puts on the piezoelectric patches 30 with positive polarization characteristic, under the negative consequence (negativeaction) of piezoelectric patches 30 with positive polarization characteristic, the profile of magnetic head 240 (being mainly the magnetic head camber) will become negative attitude, shown in Fig. 9 C.With reference to figure 10B and 11A, when positive direct-current voltages 411 puts on the piezoelectric patches 30 with negative polarization characteristic, the piezoelectric patches 30 with negative polarization characteristic will be bent because of weiss territory effect (Weiss domain effect).Then, because the piezoelectric patches 30 with negative polarization characteristic is clamped between magnetic head 240 and the cantilever tongue piece 328 and cantilever tongue piece 328 rigidity are low, like this, under the positive role (positive action) of piezoelectric patches 30 with negative polarization characteristic, the profile of magnetic head 240 (being mainly the magnetic head camber) will become negative attitude, shown in Fig. 9 C.On the contrary, with reference to figure 11B, when negative dc voltage 411a puts on the piezoelectric patches 30 with negative polarization characteristic, under the negative consequence (negative action) of piezoelectric patches 30 with negative polarization characteristic, the profile of magnetic head 240 (being mainly the magnetic head camber) will become positive attitude, shown in Fig. 9 B.
In another embodiment, shown in Figure 12 A-12C, piezoelectric patches 30 also can be installed in the back side of cantilever tongue piece 328.Like this, magnetic head 240 is with regard to the one side that directly is contained in cantilever tongue piece 328 and piezoelectric patches 30 is contained in the another side of cantilever tongue piece 328.Similarly, when not having voltage to put on the piezoelectric patches 30, piezoelectric patches 30 will rest on its original position, and magnetic head 240 also keeps its original profile, shown in Figure 12 A.When a positive direct-current voltages puts on the piezoelectric patches 30 with positive polarization characteristic, the piezoelectric patches 30 with positive polarization characteristic will be bent because of weiss territory effect (Weiss domain effect).And magnetic head 240 is contained in the front of cantilever tongue piece 328 because the piezoelectric patches 30 with positive polarization characteristic is installed in the back side of cantilever tongue piece 328, and cantilever tongue piece 328 has low rigidity simultaneously, shown in Figure 12 B.Like this, under the positive role of piezoelectric patches 30 with positive polarization characteristic, the profile of magnetic head 240 (being mainly the magnetic head camber) will become positive attitude, otherwise, when negative dc voltage puts on the piezoelectric patches 30 with positive polarization characteristic, the profile of magnetic head 240 (being mainly the magnetic head camber) will become negative attitude under the negative consequence of the piezoelectric patches 30 with positive polarization characteristic, shown in Figure 12 C.If piezoelectric patches 30 has the negative polarization characteristic, its principle of work and above-mentioned principle are similar, are not describing in detail at this.In another embodiment, can be equiped with two or more piezoelectric patches 30 in the one or both sides of cantilever tongue piece 328, this will improve the ability of adjusting magnetic head 240 profiles (being mainly the magnetic head camber), and then improve the ability of adjusting magnetic head 240 flying heights.
Figure 13 has described between the camber of magnetic head 240 in the one embodiment of the invention and its flying height and has concerned.It has showed that high camber will cause low flying height.
In another embodiment of magnetic head fold piece combination of the present invention, as shown in figure 14, cantilever tongue piece 328 is divided into two parts: a part is movable part 703, and another part is a fixed part 702.Two narrow otch 298 are formed on the fixed part 702, and the small embossment 329 (ginseng Figure 16) on the load beam 219 places between two narrow otch 298 and is used for support fixation portion 702.
With reference to figure 14-16, in assembling, at first, piezoelectric patches 30 bonds on the movable part 703 of cantilever tongue piece 328 by ACF sheet 70.Then, magnetic head 240 is placed on the cantilever tongue piece 328, thereby piezoelectric patches 30 is clamped between cantilever tongue piece 328 and the magnetic head 240.In this embodiment, magnetic head 240 is adhered on the fixed part 702 of cantilever tongue piece 328 by epoxy glue or tackifier 257 ' part.Similarly, after above-mentioned assembling, set up the electrical connection of 30 of magnetic head 240, cantilever tongue piece 328 and piezoelectric patches by Metal Ball 501 or ACF sheet 70.
In another embodiment of magnetic head fold piece combination of the present invention, with reference to figure 17-18, described magnetic head fold piece combination further comprises a U type ceramic frame 801 outside the piezoelectric patches 30 that is provided with two electrode contacts 301, this U type ceramic frame 801 is provided with two PZT sheets 803 in its both sides.Magnetic head 240 is contained in the U type ceramic frame 801, outside four electrode contacts 241 on it are exposed to.Described two PZT sheets 803 are piezoelectric membrane sheet or piezoelectric ceramic piece.Each piezoelectric patches 803 is provided with two electrode contacts 802.Cantilever tongue piece 328 is divided into two parts, and a part is a movable part 703 ', and another part is a fixed part 702 '.On fixed part 702 ', be provided with two slits 218 ' in order to reduce the rigidity of cantilever tongue piece 328.Go up counter electrode contact 802 at the fixed part 702 ' of cantilever tongue piece 328 and be provided with plural electrode contacts 824, simultaneously, counter electrode contact 301 and 241 also is provided with plural electrode contacts 351,361.In addition, flexible element 217 is provided with plural connecting terminal 251, and the one end links to each other with control system (not shown), and the other end links to each other with cable 210,211.Connecting terminal 251 is connected magnetic head 240, piezoelectric patches 30 and two piezoelectric patches 803 by cable 210,211 with control system (not shown).
In this embodiment, at first, the movable part 703 ' of piezoelectric patches 30 by ACF sheet 70 and cantilever tongue piece 328 electrically reaches physics and links to each other, and accordingly, electrode contacts 301 and electrode contacts 351 also interconnect.Then, U type ceramic frame 801 parts are connected on the cantilever tongue piece 328, and plural Metal Ball (GBB or SBB, not shown) is used for electrode contacts 824,351 is connected with electrode contacts 802,804, thereby 211 on two piezoelectric patches 803 and cable are connected.In addition, also there is plural Metal Ball (GBB or SBB, not shown) that electrode contacts 241 is connected with electrode contacts 361, thereby magnetic head 240 and cantilever tongue piece 328 are electrical connected.
When power supply puts on the piezoelectric patches 803 by cable 211, piezoelectric patches 803 will expand or shrink and cause 801 distortion of U type ceramic frame, thereby and then make magnetic head 240 obtain good position adjustment along the radially rotation of disk.When power supply puts on the piezoelectric patches 30 by cable 210, piezoelectric patches 30 will cause magnetic head 240 profiles (mainly being the magnetic head camber) thus variation obtain good flying height adjustment.In the 4th embodiment of magnetic head fold piece combination of the present invention, with reference to figure 19-21, the U type ceramic frame 801 with two piezoelectric patches 803 can also be substituted by 860 and piezoelectric units 850 at the bottom of the metallic support.Piezoelectric unit 850 comprises two piezoelectric membrane sheets 853 (also can be piezoelectric ceramic piece) and in the plural electrode contacts of one side (for diagram).Support base 860 comprises substrate 861, draws post 862 and movable plate 865.Described movable plate 865 has two side arms 863 in its both sides.In one embodiment of the invention, the width that draws post 862 is narrower than the width of movable plate 865.Piezoelectric unit 850, links to each other with support base 860 physics as bonding mode by traditional mode.The cantilever tongue piece 328 of cantilever 100 is divided into two parts, and a part is a movable part 703 ", another part is a fixed part 702 ".At fixed part 702 " on be provided with the rigidity that two slits 218 ' are used to reduce cantilever tongue piece 328, the small embossment 329 (ginseng Figure 21) on the load beam 219 is placed between two slits 218 ' in order to support fixation portion 702 ".
With reference to figure 19-21, in the present invention, after piezoelectric unit 850 and support base 860 were combined together to form an additional microdrive, described additional microdrive was by the fixed part 702 of ACF and flexible element 217 " electrically reach physics and link to each other.Parallel clearance 313 form with described additional microdrive and cantilever tongue piece 328 between, thereby the facile motion of guaranteeing to add microdrive.Then, piezoelectric patches 30 is connected to the movable part 703 of cantilever tongue piece 328 by ACF sheet 70 " on.Afterwards, magnetic head 240 is placed on piezoelectric patches 30 and the additional microdrive, then, and by ACF or tackifier 257 ' electrically and the part physical connections with the movable plate 865 of itself and support base 860.Physical connection can make magnetic head 240 and additional microdrive move together, is electrically connected the Electrostatic Discharge damage that then is used to stop magnetic head 240.
In this embodiment, four Metal Ball 501 (GBB or SBB) are used to electrically connect magnetic head 240 and two cables 210.Piezoelectric unit 850 on the cantilever tongue piece 328 links to each other with cable 211 by ACF or conducting resinl by the electrode contacts on it.By cable 210,211, connecting terminal 251 is electrical connected magnetic head 240, piezoelectric patches 30 and additional microdrive and control system (not shown).When power supply puts on the piezoelectric unit 850 by cable 211, piezoelectric unit 850 will expand or shrink and cause support base 860 distortion, thereby and then make magnetic head 240 obtain good position adjustment along the radially rotation of disk.When power supply puts on the piezoelectric patches 30 by cable 210, piezoelectric patches 30 will cause magnetic head 240 profiles (mainly being the magnetic head camber) thus variation obtain good flying height adjustment.
In the present invention, finish the assembling of described magnetic head fold piece combination 2 after, magnetic head fold piece combination 2 and actuating arm 587 are put into then in the housing 581 and with it and are fixed.The parts that other is necessary, for example disk 583, Spindle Motor (spindle motor) 585 and voice coil motor (VCM) 914 ' also are loaded into housing 581.Like this, a disc driver has just formed, as shown in figure 22.
A kind of method with magnetic head fold piece combination adjustment flying height of the present invention comprises the steps: (1) spinning disk 583, and disk 583 is used for canned data; (2) read described information by magnetic head 240; (3) when disk 583 rotations, excite piezoelectric patches 30 with the height of control head 240 with respect to disk 583.
Figure 23 has showed that is used for the electric control loop that disc driver flying height of the present invention is adjusted.Data message is also therefrom read or writes in magnetic head 240 flights on disk 583.(positionerror signal PES) 990 is picked up by a servo-control system (show) and is divided into two paths of signals, i.e. signal 904 and 905 position error signal.Wherein, signal 904 is admitted to sound figure motor controller (VCM controller) 907 and is used to control voice coil motor driver 908 (VCM driver).Voice coil motor driver 908 is used for driving or adjusting voice coil motor (VCM) 909, thereby adjusts the position of magnetic head 240.Signal 905 then is converted into PW50 (50% width of amplitude, 50% amplitude width) signal, and is admitted in the flying height adjustment counter 910.Flying height is adjusted counter 910 and is gone out required flying height adjustment by the needed PW50 calculated signals of contrast servo-control system (not showing), export a driving voltage then, this driving voltage can make piezoelectric patches 30 distortion and then change the flying height of magnetic head 240.Described subsequently driving voltage is admitted to piezoelectricity operation driver (PZT operation driver) 911 and puts on the piezoelectric patches 30, and then carries out good flying height adjustment.
Above disclosed only is preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of being done according to the present patent application claim still belongs to the scope that the present invention is contained.
Claims (14)
1. a magnetic head fold piece combination (head gimbal assembly) comprising:
Magnetic head (slider);
Be used to support the cantilever part (suspension) of magnetic head;
Be used to adjust the fly-height adjustments device of magnetic head flight height (flying height); And
Be used to electrically connect the flexible cable of described magnetic head and fly-height adjustments device.
2. magnetic head fold piece combination as claimed in claim 1 is characterized in that: described fly-height adjustments device comprises at least one piezoelectric patches that places between described magnetic head and cantilever part.
3. magnetic head fold piece combination as claimed in claim 1 is characterized in that further comprising being used for anisotropic conductive film (anisotropic conductive film) that described fly-height adjustments device and described cantilever part are connected with flexible cable.
4. magnetic head fold piece combination as claimed in claim 2 is characterized in that: described piezoelectric patches is piezoelectric membrane sheet, piezoelectric ceramic piece or relaxation ferroelectric ceramic (PMN-Pt) piezoelectric patches.
5. magnetic head fold piece combination as claimed in claim 2 is characterized in that: described piezoelectric patches is individual layer piezoelectric patches or multi-layer piezoelectric sheet.
6. magnetic head fold piece combination as claimed in claim 2 is characterized in that: described piezoelectric patches is bonded in the one or both sides in the cantilever tongue piece zone of cantilever part.
7. magnetic head fold piece combination as claimed in claim 1 is characterized in that: the cantilever tongue piece zone at cantilever part forms at least one slit.
8. the method with the described magnetic head fold piece combination adjustment of claim 1 flying height comprises the steps:
Spinning disk, disk is used for canned data;
Read described information by magnetic head;
When disk rotates, excite piezoelectric patches with the height of control head with respect to disk.
9. method as claimed in claim 8 is characterized in that: described fly-height adjustments device comprises at least one piezoelectric patches that places between described magnetic head and cantilever part.
10. method as claimed in claim 8 is characterized in that: anisotropic conductive film (anisotropicconductive film) is used for described fly-height adjustments device is connected with flexible cable with described cantilever part.
11. a hard disk drive comprises:
The disk that is used for canned data; And
Magnetic head fold piece combination; It is characterized in that described magnetic head fold piece combination comprises:
The magnetic head that on disk, flies (slider);
Be used to support the cantilever part (suspension) of magnetic head;
Be used to adjust the fly-height adjustments device of magnetic head flight height (flying height); And
Be used to electrically connect the flexible cable of described magnetic head and fly-height adjustments device.
12. hard disk drive as claimed in claim 11 is characterized in that: described fly-height adjustments device comprises at least one piezoelectric patches that places between described magnetic head and cantilever part.
13. hard disk drive as claimed in claim 11 is characterized in that further comprising being used for anisotropic conductive film (anisotropic conductive film) that described fly-height adjustments device and described cantilever part are connected with flexible cable.
14. a system that dynamically adjusts flying height is characterized in that comprising:
Servo-control system; Be used for the take-off location error signal (position error signal, PES) and be divided into two-way PES signal;
Voice coil motor controller (VCM controller); Be used to receive one road PES signal and control voice coil motor driver (VCM driver), thereby drive voice coil motor and adjust head position;
Flying height is adjusted counter; Be used to receive another road PES signal, and go out required flying height adjustment, export a driving voltage then by contrasting the needed calculated signals of described servo-control system;
Piezoelectricity operation driver; Receive described driving voltage and it is put on the fly-height adjustments device to change the flying height of magnetic head.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410085301 CN1758342A (en) | 2004-10-09 | 2004-10-09 | Magnetic head folding sheet assembly, magnetic disc driver and its flight altitude regulating method and system |
| JP2005294782A JP2006114209A (en) | 2004-10-09 | 2005-10-07 | Head gimbal assembly having float amount adjusting function, hard disk drive using same, and method and system for adjusting float amount |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410085301 CN1758342A (en) | 2004-10-09 | 2004-10-09 | Magnetic head folding sheet assembly, magnetic disc driver and its flight altitude regulating method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1758342A true CN1758342A (en) | 2006-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410085301 Pending CN1758342A (en) | 2004-10-09 | 2004-10-09 | Magnetic head folding sheet assembly, magnetic disc driver and its flight altitude regulating method and system |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006114209A (en) |
| CN (1) | CN1758342A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295513B (en) * | 2007-04-25 | 2012-09-05 | 新科实业有限公司 | Cantilever member and manufacturing method thereof, magnetic head tab combination and disk drive unit |
| CN103489456A (en) * | 2012-06-13 | 2014-01-01 | 日立环球储存科技荷兰有限公司 | In-situ contact potential measurement in hard-disk drives |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070297080A1 (en) * | 2006-06-23 | 2007-12-27 | Lee Sungchang | Apparatus and method for bending a slider to create rounded corners on its trailing edge in a hard disk drive |
| JP4772747B2 (en) * | 2007-05-28 | 2011-09-14 | シャープ株式会社 | Head, recording / reproducing apparatus, and control method for recording / reproducing apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3247425B2 (en) * | 1992-06-16 | 2002-01-15 | 松下電器産業株式会社 | Floating magnetic head suspension |
| JP3998590B2 (en) * | 2003-02-24 | 2007-10-31 | 株式会社日立グローバルストレージテクノロジーズ | Magnetic disk unit |
-
2004
- 2004-10-09 CN CN 200410085301 patent/CN1758342A/en active Pending
-
2005
- 2005-10-07 JP JP2005294782A patent/JP2006114209A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295513B (en) * | 2007-04-25 | 2012-09-05 | 新科实业有限公司 | Cantilever member and manufacturing method thereof, magnetic head tab combination and disk drive unit |
| CN103489456A (en) * | 2012-06-13 | 2014-01-01 | 日立环球储存科技荷兰有限公司 | In-situ contact potential measurement in hard-disk drives |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006114209A (en) | 2006-04-27 |
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