CN1770268A - Micro-actuator, head gimbal assembly employing the micro-actuator and disk drive - Google Patents
Micro-actuator, head gimbal assembly employing the micro-actuator and disk drive Download PDFInfo
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- CN1770268A CN1770268A CN 200410092058 CN200410092058A CN1770268A CN 1770268 A CN1770268 A CN 1770268A CN 200410092058 CN200410092058 CN 200410092058 CN 200410092058 A CN200410092058 A CN 200410092058A CN 1770268 A CN1770268 A CN 1770268A
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Abstract
The invention discloses a slider tab combination which comprises: slider and micro-actuator; wherein the micro-actuator comprises base arms, movable arm and two side arms that take the axial of base arm as axis of symmetry and are connected with the base arm and movable arms, and at least one piezo-electric chip connected with one of the side arms; suspension component for supporting the slider and micro-actuator. The slider is positioned on the movable arm and rotated by the movable arm when the at least one piezo-electric chip is activated. The invention also discloses a hard disk driver structure that uses the slider tab combination.
Description
Technical field
The present invention relates to disc driver, the magnetic head fold piece combination that is meant microdrive especially and uses this microdrive.
Background technology
Disc driver is a kind of information-storing device that uses the magnetic medium storage data.With reference to figure 1a, existing typical disc driver (Disk Drive) comprises that a disk and one are used to drive magnetic head fold piece combination 277 (Head Gimbal Assembly, actuating arm HGA) (magnetic head fold piece combination 277 is provided with a cantilever part (indicating) that magnetic head 203 is housed).Wherein, disk is contained in one in order on the Spindle Motor that drives the disk rotation, a voice coil motor (Voice-Coil Motor, VCM) be used for the motion of controlling and driving arm, thereby control head 203 moves to next track from a track on magnetic disk surface, and then reads or write data from disk.
Yet, in the stroke of magnetic head 203 and since voice coil motor (VCM) and cantilever part intrinsic tolerance (Tolerance), magnetic head 203 can not carry out good position control, thereby influences magnetic head 203 read or write data from disk.
In order to address the above problem, piezo-electric micro driver (piezoelectric (PZT) micro-actuator) is used to adjust the displacement (displacement) of magnetic head 203.That is, thereby piezo-electric micro driver is adjusted the displacement compensation voice coil motor (VCM) of magnetic head 203 and the tolerance of cantilever part with a less amplitude.Like this, can make the track width become littler, can increase the TPI value (' tracks per inch ' value) (promptly having increased its surface recording density) of 50% disc driver.
With reference to figure 1b, traditional piezo-electric micro driver 205 is provided with the ceramic frame 297 of a U-shaped.This U-shaped ceramic frame 297 comprises two ceramic arms 207, and wherein each ceramic arm 207 is provided with a piezoelectric patches (not shown) in the one side.With reference to figure 1a and 1b, piezo-electric micro driver 205 links to each other with cantilever part 213 physics, wherein, in each ceramic arm 207 1 side, three 209 (gold goal welding (gold ball bonding that receive that are electrically connected are arranged, GBB) or the tin ball bonding meet (solder bump bonding, SBB)) microdrive 205 be connected on the cable 210 of magnetic head fold piece combination.In addition, also have four 208 (GBB or SBB) that receive of being electrically connected to be used to realize being electrically connected between magnetic head 203 and the cantilever part 213.Fig. 1 c has then showed the detailed process of magnetic head 203 being inserted microdrive 205.Wherein, magnetic head 203 2: 206 bonding by on epoxy glue point 212 and two the ceramic arms 207, thus make the motion of magnetic head 203 depend on the ceramic arm 207 of microdrive 205.
When electric current puts on the microdrive 205 by cantilever part cable 210, thereby the piezoelectric patches of microdrive 205 will expand or shrink ceramic arms 207 distortion of two of causing U-shaped ceramic frame 297 and magnetic head 203 is moved on the track of disk.Like this, a good head position adjustment (head positionadjustment) just can realize.
Yet, because described piezo-electric micro driver 205 and magnetic head 203 are installed on the cantilevered tab (not indicating), when piezo-electric micro driver 205 is excited, because the restriction of the U-shaped ceramic frame 297 of microdrive 205, it will be done simple translation and magnetic head 203 is waved, and will produce the resonance of the cantilever part of the frequency identical with the vibrations that excite the cantilever part substrate to cause like this.This will limit the raising of the servo bandwidth and the capacity of disc driver.As shown in Figure 2, the resonance curve when label 201 representatives excite the cantilever part substrate, the resonance curve when label 202 representatives excite microdrive 205, this figure clearly shows the problems referred to above.
In addition, because microdrive 205 comprises an extra block, thus its static properties not only influenced, and influence the dynamic property of cantilever part 213, the performance that for example resonates (resonance performance), thus reduce the resonant frequency of cantilever part 213 and increased its gain.
Therefore, providing a kind of microdrive, magnetic head fold piece combination, disc driver is necessity to address the above problem real.
Summary of the invention
Based on the deficiencies in the prior art, fundamental purpose of the present invention is to provide a kind of microdrive and magnetic head fold piece combination, can realize good head position adjustment, and when exciting microdrive, have good resonance performance (resonance performance).
Another object of the present invention is to provide a kind of disc driver with big servo bandwidth and head position adjustment capability.
In order to achieve the above object, the present invention has disclosed a kind of magnetic head fold piece combination (head gimbalassembly), comprising: magnetic head (slider); Microdrive (micro-actuator); Wherein said microdrive comprises that the axis that end arm, lever arm reach with end arm is two side arms that axis of symmetry was symmetrically distributed, also connected respectively arm of the described end and lever arm; And at least one piezoelectric patches that is connected with described side arm; And be used to support the cantilever part (suspension) of described magnetic head and microdrive; Wherein, described magnetic head is contained on the lever arm, and is rotated by described lever arm when exciting described at least one piezoelectric patches.
In one embodiment, described lever arm comprises a support portion of supporting magnetic head, and respectively be positioned at the support portion diagonal line on two connecting portions linking to each other of both ends.The width of described each connecting portion is all less than the width of support portion.Described head portion is contained in the support portion of described carriage, and the center of magnetic head and described support portion is complementary.Described two connecting portions can link to each other with two side arms by two tie points, and described two tie points are that axis of symmetry is symmetrically distributed with the longitudinal axis of carriage.Distance between two side arms is greater than the width of magnetic head.Arm of the described end partly links to each other with described cantilever part, forms a parallel clearance between described carriage and described cantilever part.Described side arm is formed at the both sides of arm of the described end and lever arm, forms at least one at interval between side arm and end arm or between side arm and lever arm.Described at least one piezoelectric patches is contained in the one or both sides of described each side arm.The material of arm and cantilever part is epoxy glue, cementing agent or anisotropic conductive mould (ACF) at the bottom of described be used to the to bond material of magnetic head and carriage and the described carriage that bonds.
A kind of microdrive of the present invention comprises: end arm; Lever arm in order to support and rotating magnetic head; Axis with end arm is two side arms that axis of symmetry was symmetrically distributed, also connected respectively arm of the described end and lever arm; And at least one piezoelectric patches that is connected to described two side arms.In one embodiment, described lever arm comprises a support portion of supporting magnetic head, and respectively be positioned at the support portion diagonal line on two connecting portions linking to each other of both ends.The width of described each connecting portion is all less than the width of support portion.Described at least one piezoelectric patches is film piezo-electric sheet or piezoelectric ceramics sheet.Described at least one piezoelectric patches is single layer structure or comprises basic unit and the sandwich construction of piezoelectric layer.Described piezoelectric layer is individual layer piezoelectric structure or multi-layer piezoelectric structure, and described basic unit is made by metal, pottery or polymkeric substance (polymer).Described side arm is formed at the both sides of arm of the described end and lever arm, forms at least one at interval between side arm and end arm or between side arm and lever arm.Described at least one piezoelectric patches is contained in the one or both sides of described each side arm.The material of described be used to bond magnetic head and carriage is epoxy glue, cementing agent or anisotropic conductive mould (ACF).
A kind of hard disk drive of the present invention comprises: magnetic head fold piece combination; The actuating arm that is connected with described magnetic head fold piece combination; Disk; And in order to rotate the Spindle Motor of described disk; Wherein, described magnetic head fold piece combination comprises magnetic head (slider), microdrive (micro-actuator) and is used to support the cantilever part (suspension) of described magnetic head and microdrive; Wherein, described microdrive comprises that the axis that end arm, lever arm reach with end arm is two side arms that axis of symmetry was symmetrically distributed, also connected respectively arm of the described end and lever arm; And at least one piezoelectric patches that is connected with described side arm; Wherein, described magnetic head is contained on the lever arm, and is rotated by described lever arm when exciting described at least one piezoelectric patches; Arm portion of the described end is contained on the cantilever part, forms a parallel clearance at carriage and cantilever part spare.
Compared with prior art, microdrive of the present invention utilizes piezoelectric patches to come the side arm of bent support frame, thus the lever arm of rotation carriage, and because head portion be installed on the lever arm, thereby can rotating magnetic head.Simultaneously, the connecting portion of two narrow width of carriage can stop the magnetic head transverse movement, and only allows magnetic head to rotate together around its center and with described lever arm.Simultaneously, because lever arm is corresponding with the center of magnetic head, so magnetic head can be worked under the situation that does not make the magnetic head fold piece combination swing.
In the present invention, hinder marginal part of magnetic head (trailing side) and exterior region (leading side) thus can simultaneously make magnetic head obtain bigger mobile range to the different directions rotation.Simultaneously, because magnetic head is along its center rotation, so can obtain a bigger position stroke adjustment capability and wideer servo bandwidth.Usually, the work efficiency of adjusting the microdrive of magnetic head by rotation mode is 3 times of the microdrive (for example prior art) of adjusting magnetic head by the translation mode.Microdrive of the present invention is adjusted magnetic head so can obtain being equivalent to the work efficiency of 3 times of prior aries by rotation mode.In addition, because the width of magnetic head is less than the distance between two side arms, thereby form two gaps between the two, like this, when microdrive is excited, magnetic head will more freely rotate in a wider context.In addition, the cantilever resonance effect can not occur in low-frequency range, and only has simple microdrive resonance effect to occur in high band, and this will increase the servo bandwidth and the disc driver capacity of disc driver.At last, contrast existing U type ceramic frame, the structure of microdrive of the present invention will obtain better anti-seismic performance.
For making the present invention easier to understand, further set forth the specific embodiment of microdrive of the present invention, magnetic head fold piece combination, hard disk drive below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 a is the stereographic map of existing magnetic head fold piece combination (HGA);
Fig. 1 b is the enlarged partial view of Fig. 1 a;
Fig. 1 c has showed magnetic head has been inserted detailed process in the microdrive of magnetic head fold piece combination among Fig. 1 a (HGA);
Fig. 2 has showed the resonance curve (resonance curve) of magnetic head fold piece combination among Fig. 1 a;
The stereographic map of Fig. 3 magnetic head fold piece combination of the present invention (HGA) first embodiment;
Fig. 4 is the partial enlarged drawing of magnetic head fold piece combination among Fig. 3;
Fig. 5 is the exploded view of Fig. 4;
Fig. 6 is the partial side view of magnetic head fold piece combination among Fig. 3;
Fig. 7 has showed microdrive and the stereographic map of adorning magnetic head thereon among Fig. 3;
Fig. 8 has showed the original state the when microdrive that magnetic head is housed among Fig. 7 is not applied to voltage;
Fig. 9 a has showed the electrical connection between two piezoelectric patches of microdrive shown in Figure 8, and according to one embodiment of the invention, described two piezoelectric patches have identical polarised direction;
Fig. 9 b has showed the electrical connection between two piezoelectric patches of microdrive shown in Figure 8, and according to a further embodiment of the invention, described two piezoelectric patches have opposite polarised direction;
Fig. 9 c has showed the oscillogram that is added in shown in Fig. 9 b two voltages on two piezoelectric patches respectively;
Fig. 9 d has showed the oscillogram that is added in shown in Fig. 9 a the voltage on two piezoelectric patches respectively;
Figure 10 and 11 has showed two kinds of different working methods the when microdrive that magnetic head is housed among Fig. 8 is excited;
Figure 12 is the resonance curve of magnetic head fold piece combination among Fig. 3;
Figure 13-15 is the stereographic map of three embodiment of the carriage of microdrive of the present invention;
Figure 16-18 is the synoptic diagram of three embodiment of microdrive of the present invention;
Figure 19 is the stereographic map of an embodiment of disc driver of the present invention.
Embodiment
With reference to figure 3, a kind of magnetic head fold piece combination 3 of the present invention comprises magnetic head 31, microdrive 32 and is used to carry the cantilever part 8 of described magnetic head 31 and microdrive 32.
With reference to figure 4 and 5, described flexible element 13 also comprises a cantilever tongue piece (suspension tongue) 328, described cantilever tongue piece 328 is used to support microdrive 32 and magnetic head 31, and makes bearing capacity always put on the central area of magnetic head 31 by the kick on the load beam 17 329.Described cantilever tongue piece 328 is provided with plural electrode contacts 113 and 310.Magnetic head 31 1 ends are provided with plural electrode contacts 204 corresponding to cantilever tongue piece 328 top electrode contacts 113.
With reference to figure 4-5, according to one embodiment of the invention, microdrive 32 comprises carriage 320 and two piezoelectric patches 321.Counter electrode contact 310 is provided with plural electrode contacts 333 on each piezoelectric patches 321.Described carriage 320 can be made by metal (for example, stainless steel), pottery or polymkeric substance, and it comprises end arm 393, lever arm 394 and two side arms 391,392.Two side arms 391,392 is that axis of symmetry is symmetrically distributed with the axis of end arm 393, and each side arm 391,392 all links to each other with lever arm 394 with end arm 393.In this embodiment, the distance that two side arms is 391,392 when magnetic head 31 is contained on the carriage 320, just forms two gaps 315 at carriage 320 and 31 of magnetic heads greater than the width of magnetic head 31.In addition, lever arm 394 comprises a support portion 10 that is used to support magnetic head 31 and two connecting portions 11 and 12.Described connecting portion 11 and 12 respectively be positioned at support portion 10 diagonal line on both ends link to each other.Each connecting portion 11 and 12 width be less than the width of support portion 10, thereby form a notch 14 at side arm 391 and 10 of support portions, forms an otch (indicating) at side arm 392 and 10 of support portions simultaneously.In order to increase the elasticity of carriage 320, can form two notches 16 at end arm 393 and 391,392 of two side arms.In this embodiment, described support portion 10 is a rectangular shape, and described connecting portion 11 vertically links to each other with it with 12.
With reference to figure 4-5, on load beam 17, be formed with a stop means 207, this stop means 207 passes cantilever tongue piece 328 in order to prevent that cantilever tongue piece 328 is in operate as normal or be given a shock or can overbend when clashing into. in the present invention, described piezoelectric patches 321 can be traditional connected mode with the connected mode of carriage 320, for example epoxy glue connects (epoxy bonding), anisotropic conductive film (anisotropicconductive film, ACF) connection.
In one embodiment, hinge portion 394 forms corresponding to the position of small embossment 329 on the load beam 17.Like this, carriage 320 just has identical rotation center with cantilevered tab 328, and a parallel clearance 400 is formed between carriage 320 and the cantilevered tab 328 simultaneously.In the present invention, piezoelectric patches 321 is by linking to each other its two ends and couple together with carriage 320 in two free end 392b of carriage 320 with 390b.Similar, piezoelectric patches 322 is by linking to each other its two ends and couple together with carriage 320 in two free end 392a of carriage 320 with 390a.In the present invention, described piezoelectric patches 321 is preferably made by piezoelectric film material, and this piezoelectric patches 321 can be individual layer piezoelectric element or multilayer piezoelectric element.In one embodiment, the sandwich construction of basic unit and outer piezoelectric layer in described each piezoelectric patches 321 all can be and comprises.Basic unit can be made by pottery, polymkeric substance or metal in described, and outer piezoelectric layer can be individual layer piezoelectric element or multilayer piezoelectric element.
With reference to figure 3-8, described two piezoelectric patches 321 and carriage 320 connect together and form microdrive 32; Then, the support portion 10 of magnetic head 31 and microdrive 32 is bonding; Then, magnetic head 31 and microdrive 32 are contained in as follows on the cantilever part 8 and form magnetic head fold piece combination 3:
At first, carriage 320 is connected on the cantilever tongue piece 328 of flexible element 13 by ACF, bonding agent or epoxy glue (epoxy) part, and forms a parallel clearance between described carriage 320 and cantilever tongue piece 328.Then, plural Metal Ball 332 (GBB or SBB) electrically connects the electrode contacts on electrode contacts on two piezoelectric patches 321 333 and the cantilever tongue piece 328 310, thereby two cables on microdrive 32 and the cantilever part 8 311 are electrically connected.Simultaneously, plural Metal Ball 405 (GBB or SBB) is electrical connected electrode contacts on the magnetic head 31 204 and electrode contacts 113, thereby magnetic head 31 and cable 309 are electrically connected.By described cable 309,311, described electrode contacts 308 is with magnetic head 31 and microdrive 32 and control system be electrical connected (not shown).Obviously, magnetic head fold piece combination 3 also can be assembled like this: at first microdrive 32 is connected with cantilever part 8, then magnetic head 31 is contained on the microdrive 32.
With reference to figure 5 and 7, magnetic head 31 is installed on the support portion 10 by two epoxy strips 18 (epoxy bar) part, and magnetic head 31 is corresponding with the center of support portion 10.In this embodiment, two epoxy strips 18 are the two ends of the support portion 10 be located at symmetrically of symmetric points with 10 centers, support portion.
Fig. 8,9a, 9d and 10 have showed first kind of working method of microdrive 32 realization head positions adjustment functions.In this embodiment, described two piezoelectric patches 321 have identical polarised direction (polarizationdirection), shown in Fig. 9 a, one end 404 of these two piezoelectric patches 321 is by common ground, and other end 401a and 401b are applied the voltage (ginseng Fig. 9 d) with same sinusoidal waveform 407 respectively.Fig. 8 has showed the original state of microdrive 32, the state that does not promptly have voltage to be applied thereto.When the sinusoidal voltage with waveform 407 put on two piezoelectric patches 321, in first half period, two piezoelectric patches 321 were along with the increase of driving voltage is retracted to a position the shortest (corresponding to the displaced position of maximum) simultaneously gradually; Then along with the while that reduces of driving voltage is replied its initial position gradually.
With reference to Figure 10 and 7, when two piezoelectric patches 321 shrink simultaneously, it will make two side arms 391 and 392 bendings, and then two connecting portions 11,12 that order about lever arm 394 move in the opposite direction.Because two connecting portions 11,12 along the support portion 10 diagonal line with it to connection, and the width of each connecting portion 11,12 is less than the width of support portion 10, thereby make support portion 10 under the effect of the moment of torsion that two connecting portions 11,12 produce, 501 rotate to maximum displacement position 502 from the original position, get back to original position 501 then again around its center.Accordingly, because magnetic head 31 is connected with support portion 10 parts by two epoxy strips 18, and magnetic head 31 is corresponding with the center of support portion 10, thus magnetic head 31 will be around its center and 501 forwards maximum displacement position 502 to from the original position with support portion 10, get back to its original position 501 then again.In addition, two gaps 315 between magnetic head 31 and carriage 320 have guaranteed rotating freely of magnetic head 31.
With reference to figure 8,9a, 9d and 11, when driving voltage 407 enters second half period (opposite) with the phase place of first half period, two piezoelectric patches 321 will expand into a maximum displacement position simultaneously gradually along with the increase of negative driving voltage, be reduced to zero along with negative driving voltage then and get back to its original position gradually.Accordingly, it will make magnetic head 31 rotate to maximum displacement position 503 from its original position 501, get back to its original position then again.Here, because magnetic head 31 is ordered about along its center rotation, thereby can carry out a good head position adjustment.
Fig. 8,9b, 9c and 10-11 have showed the another kind of working method of two piezoelectric patches 321 realization head positions adjustment functions.In this embodiment, described two piezoelectric patches 321 have opposite polarised direction, shown in Fig. 9 b.One end 404 of these two piezoelectric patches 321 is by common ground, and other end 401a and 401b are applied two voltages (shown in Fig. 9 c) with two different wave 406,408 respectively.Under above-mentioned driven, in identical half period, two piezoelectric patches 321 will be retracted to the shortest position simultaneously gradually, get back to its initial position then again.When driving voltage 406,408 entered down half period, two piezoelectric patches 321 will expand into the longest position simultaneously, get back to its original position then again.Similarly, magnetic head 31 will rotate and then obtain good head position adjustment circularly around its center.
In the present invention, because the width of described each connecting portion 11,12 is littler than the width of the support portion 10 of carriage 32, so it will help the rotation of support portion 10 and magnetic head 31, that is, thereby having a narrow width, connecting portion 11,12 it easily will be bent can order about 31 rotations of support portion 10 and magnetic head.In addition, with reference to figure 6, the parallel clearance that cantilever tongue piece 328 and lever arm are 394 will make support portion 10 and magnetic head 31 can rotate more freely when being driven by piezoelectric patches 321.
Compared with prior art, the lever arm of microdrive 32 of the present invention by rotating on it with two piezoelectric patches 321, thereby making magnetic head 31 is that rotation center rotates with its center, and then the exterior region (leading side) of magnetic head 31 and hinder marginal part (trailing side) are moved toward different directions, and existing microdrive only can be swung the hinder marginal part (because its exterior region is fixed) of magnetic head.Like this, it is more effective that the present invention can make the position adjustment of magnetic head.Accordingly, just can improve the position adjustment capability (head positionadjustment capacity) of magnetic head.
Figure 12 has showed the test result of magnetic head fold piece combination of the present invention resonance performance, and wherein, 701 represent the substrate excitation resonance curve of cantilever part, and 702 represent microdrive excitation resonance curve.Can find out from this figure, when exciting microdrive 32, cantilever resonance does not occur in low-frequency range, and only have simple microdrive resonance to occur in high band, to increase the servo bandwidth of disc driver like this and improve its capacity, reduce the search and the positioning time (seeking and settling time) of magnetic head simultaneously.
With reference to figure 13-15, in the present invention, carriage 32 also can be other structure, and for example, support portion 10 can be other shape (for example, long trapezoid body) except that rectangular parallelepiped.Selectively, connecting portion 11,12 can be at a certain angle, and (not being 90 degree) is connected with support portion 10.For 11,12, one otch 15 of easier crooked connecting portion can be provided between connecting portion 11 (12) and the support portion 10.
In three embodiment of the present invention, with reference to figure 16-18, support portion 10 can have a profile that is made of smooth circular arc.In addition, connecting portion 11,12 also can be curve-like.In addition, in order to make the weighing apparatus that maintains an equal level of trying hard to keep that puts on the support portion 10, connecting portion 11,12 can link to each other with two side arms 391,392 by two tie points 500, and described two tie points 500 are that axis of symmetry is symmetrically distributed with the longitudinal axis of carriage.In the present invention, described piezoelectric patches can be contained in the one or both sides of each side arm 391,392.
In the present invention, with reference to Figure 19, magnetic head fold piece combination of the present invention 3 assembled with disc driver housing 108, disk 101, Spindle Motor 102, voice coil motor 107 etc. can form a disc driver.Because the assembling process of disc driver of the present invention and structure are known by the industry those of ordinary skill, be not described in detail in this.
Claims (20)
1. a magnetic head fold piece combination (head gimbal assembly) is characterized in that comprising:
Magnetic head (slider);
Microdrive (micro-actuator); Wherein said microdrive comprises that the axis that end arm, lever arm reach with end arm is two side arms that axis of symmetry was symmetrically distributed, also connected respectively arm of the described end and lever arm; And at least one piezoelectric patches that is connected with described side arm; And
Be used to support the cantilever part (suspension) of described magnetic head and microdrive;
Wherein, described magnetic head is contained on the lever arm, and is rotated by described lever arm when exciting described at least one piezoelectric patches.
2. magnetic head fold piece combination as claimed in claim 1 is characterized in that: described lever arm comprises a support portion of supporting magnetic head, and respectively be positioned at the support portion diagonal line on two connecting portions linking to each other of both ends.
3. magnetic head fold piece combination as claimed in claim 2 is characterized in that: the width of described each connecting portion is all less than the width of support portion.
4. magnetic head fold piece combination as claimed in claim 2 is characterized in that: described head portion is contained in the support portion of described carriage, and the center of magnetic head and described support portion is complementary.
5. magnetic head fold piece combination as claimed in claim 2 is characterized in that: described two connecting portions can link to each other with two side arms by two tie points, and described two tie points are that axis of symmetry is symmetrically distributed with the longitudinal axis of carriage.
6. magnetic head fold piece combination as claimed in claim 1 is characterized in that: the distance between two side arms is greater than the width of magnetic head.
7. magnetic head fold piece combination as claimed in claim 1 is characterized in that: arm of the described end partly links to each other with described cantilever part, forms a parallel clearance between described carriage and described cantilever part.
8. magnetic head fold piece combination as claimed in claim 1 is characterized in that: described side arm is formed at the both sides of arm of the described end and lever arm, forms at least one at interval between side arm and end arm or between side arm and lever arm.
9. magnetic head fold piece combination as claimed in claim 1 is characterized in that: described at least one piezoelectric patches is contained in the one or both sides of described each side arm.
10. magnetic head fold piece combination as claimed in claim 1 is characterized in that: the material of arm and cantilever part is epoxy glue, cementing agent or anisotropic conductive mould (ACF) at the bottom of described be used to the to bond material of magnetic head and carriage and the described carriage that bonds.
11. a microdrive comprises:
End arm,
Lever arm in order to support and rotating magnetic head;
Axis with end arm is two side arms that axis of symmetry was symmetrically distributed, also connected respectively arm of the described end and lever arm; And
Be connected at least one piezoelectric patches of described two side arms.
12. microdrive as claimed in claim 11 is characterized in that: described lever arm comprises a support portion of supporting magnetic head, and respectively be positioned at the support portion diagonal line on two connecting portions linking to each other of both ends.
13. microdrive as claimed in claim 12 is characterized in that: the width of described each connecting portion is all less than the width of support portion.
14. microdrive as claimed in claim 11 is characterized in that: described at least one piezoelectric patches is film piezo-electric sheet or piezoelectric ceramics sheet.
15. microdrive as claimed in claim 11 is characterized in that: described at least one piezoelectric patches is single layer structure or comprises basic unit and the sandwich construction of piezoelectric layer.
16. microdrive as claimed in claim 15 is characterized in that: described piezoelectric layer is individual layer piezoelectric structure or multi-layer piezoelectric structure, and described basic unit is made by metal, pottery or polymkeric substance (polymer).
17. microdrive as claimed in claim 11 is characterized in that: described side arm is formed at the both sides of arm of the described end and lever arm, forms at least one at interval between side arm and end arm or between side arm and lever arm.
18. microdrive as claimed in claim 11 is characterized in that: described at least one piezoelectric patches is contained in the one or both sides of described each side arm.
19. microdrive as claimed in claim 11 is characterized in that: the material of described be used to bond magnetic head and carriage is epoxy glue, cementing agent or anisotropic conductive mould (ACF).
20. a hard disk drive comprises:
Magnetic head fold piece combination;
The actuating arm that is connected with described magnetic head fold piece combination;
Disk; And
In order to rotate the Spindle Motor of described disk; It is characterized in that:
Described magnetic head fold piece combination comprises magnetic head (slider), microdrive (micro-actuator) and is used to support the cantilever part (suspension) of described magnetic head and microdrive;
Wherein, described microdrive comprises that the axis that end arm, lever arm reach with end arm is two side arms that axis of symmetry was symmetrically distributed, also connected respectively arm of the described end and lever arm; And at least one piezoelectric patches that is connected with described side arm;
Wherein, described magnetic head is contained on the lever arm, and is rotated by described lever arm when exciting described at least one piezoelectric patches; Arm portion of the described end is contained on the cantilever part, forms a parallel clearance at carriage and cantilever part spare.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410092058XA CN100458918C (en) | 2004-11-01 | 2004-11-01 | Micro-actuator, head gimbal assembly employing the micro-actuator and disk drive |
| JP2005318061A JP2006134563A (en) | 2004-11-01 | 2005-11-01 | Micro-actuator, head gimbal assembly, and disk drive unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410092058XA CN100458918C (en) | 2004-11-01 | 2004-11-01 | Micro-actuator, head gimbal assembly employing the micro-actuator and disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1770268A true CN1770268A (en) | 2006-05-10 |
| CN100458918C CN100458918C (en) | 2009-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410092058XA Expired - Fee Related CN100458918C (en) | 2004-11-01 | 2004-11-01 | Micro-actuator, head gimbal assembly employing the micro-actuator and disk drive |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006134563A (en) |
| CN (1) | CN100458918C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101751938A (en) * | 2008-12-18 | 2010-06-23 | 日立环球储存科技荷兰有限公司 | Head balance rack assembly and disc driver |
| CN111145795A (en) * | 2018-11-06 | 2020-05-12 | Tdk株式会社 | Magnetic head support mechanism and magnetic disk device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4806667B2 (en) * | 2007-08-28 | 2011-11-02 | ヒタチグローバルストレージテクノロジーズネザーランドビーブイ | Head gimbal assembly and disk drive device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3728999B2 (en) * | 1999-10-19 | 2005-12-21 | Ｔｄｋ株式会社 | Micropositioning actuator, thin film magnetic head element positioning actuator, and head suspension assembly including the actuator |
| US6760196B1 (en) * | 2001-12-12 | 2004-07-06 | Western Digital, Inc. | Microactuator with offsetting hinges and method for high-resolution positioning of magnetic read/write head |
| JP2004296005A (en) * | 2003-03-27 | 2004-10-21 | Tdk Corp | Actuator |
-
2004
- 2004-11-01 CN CNB200410092058XA patent/CN100458918C/en not_active Expired - Fee Related
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2005
- 2005-11-01 JP JP2005318061A patent/JP2006134563A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101751938A (en) * | 2008-12-18 | 2010-06-23 | 日立环球储存科技荷兰有限公司 | Head balance rack assembly and disc driver |
| CN101751938B (en) * | 2008-12-18 | 2012-09-19 | 日立环球储存科技荷兰有限公司 | Head balance rack assembly and disc driver |
| CN111145795A (en) * | 2018-11-06 | 2020-05-12 | Tdk株式会社 | Magnetic head support mechanism and magnetic disk device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006134563A (en) | 2006-05-25 |
| CN100458918C (en) | 2009-02-04 |
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