CN100535994C - Micro-driver and magnetic head folding sheet combination for magnetic disc driving device - Google Patents
Micro-driver and magnetic head folding sheet combination for magnetic disc driving device Download PDFInfo
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- CN100535994C CN100535994C CNB2005100967519A CN200510096751A CN100535994C CN 100535994 C CN100535994 C CN 100535994C CN B2005100967519 A CNB2005100967519 A CN B2005100967519A CN 200510096751 A CN200510096751 A CN 200510096751A CN 100535994 C CN100535994 C CN 100535994C
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Abstract
A micro-driver for a magnetic head folding sheet combination comprises a metal frame, wherein the metal frame comprises a bottom support connected with a cantilever piece, a top support supporting a magnetic head and a pair of side arms connecting the bottom support and the top support. The side arms extend perpendicularly from respective sides of the bottom support and the top support. Each side arm is provided with a piezoelectric element. Each of the piezoelectric elements includes two piezoelectric portions supported by a PI (polyimide) substrate. The PI substrate includes one or more bridges that physically and electrically connect the two piezoelectric portions. The bridge may be curved so as to grip the respective side arm when the two piezoelectric portions are attached thereto.
Description
Technical field
The present invention relates to a kind of information recording disk drive unit, refer more particularly to the microdrive in a kind of magnetic head fold piece combination of disk drive.More specifically, the present invention is mainly concerned with a kind of microdrive that is intended to improve the resonance performance of magnetic head fold piece combination.
Technical background
A kind of common information storing device is a disc driver, and it uses magnetic media to store data, and a portable read/write head that is arranged at this magnetic media top optionally reads or write data from described magnetic media.
The consumer always wishes that the memory capacity of this class disk drive system constantly increases, and wishes that simultaneously its read-write operation speed is faster more accurate.Therefore disc drive manufacturers is devoted to develop the disk drive with higher storage capacity always, such as increasing the density of track by reducing the track width on the disk or the mode of track pitch, and then increases the memory capacity of disk indirectly.Yet, along with the increase of track density, to the also raising accordingly of position control accuracy of read/write head, so that in compact disk, realize faster more accurate read-write operation.Along with the increase of track density, use conventional art to realize more accurate read/write head being positioned track suitable on the disk difficulty more that becomes sooner.Therefore, disc drive manufacturers is sought the mode of improving the read/write head position control always, so that the benefit of utilizing ever-increasing track density to bring.
A kind of method that improves read/write head position control accuracy on compact disc that disc drive manufacturers is often used also is microdrive for adopting second driver.This microdrive cooperates common positional precision control and the access speed control that realizes read/write head with a master driver.The disk drive that comprises microdrive is called as Dual-drive system.
Once developed many Dual-drive systems that are used to improve access speed and the position of accurate adjustment read/write head on the track of compact disk in the past.This Dual-drive system generally includes a keynote coil motor driver and a secondary microdrive, such as piezoelectric element microdrive (being PZT elementmicro-actuator).This voice coil motor driver is controlled by servo-control system, and this servo-control system causes the actuating arm rotation, and this actuating arm carries read/write head and read/write head is positioned on the track specific on the storage medium.Piezoelectric element microdrive and voice coil motor driver are used common raising access speed and the accurate position of accurate adjustment read/write head on track.Like this, the position of voice coil motor driver coarse adjustment read/write head, and piezoelectric element microdrive accurate adjustment read/write head is with respect to the position of storage medium.Two drivers cooperate and can efficiently and accurately read or writing information from the high density storage medium.
A kind of known being used to realizes the microdrive of read/write head fine position is included piezoelectric element.This piezoelectric element microdrive has the electronic installation that can excite the piezoelectric element on the microdrive and make it optionally shrink or expand.The piezoelectric element microdrive has such structure, makes the contraction of piezoelectric element or the motion that expansion causes microdrive, and then causes the motion of read/write head.With respect to the disc drive unit that only uses voice coil motor driver, the motion of this read/write head can realize the faster more accurate adjustment in read/write head position.The exemplary piezoelectric element microdrive of this class is exposed in many patents, the Jap.P. JP 2002-133803 that is called " microdrive and magnetic head fold piece combination " such as name, and name is called the Jap.P. JP 2002-074871 of " have the magnetic head fold piece combination of the driver of realizing fine position, comprise the disk drive of this magnetic head fold piece combination and the manufacture method of this magnetic head fold piece combination ".
Fig. 1 has showed a kind of existing disc drive unit, and has showed that the disk 101 that is contained on the Spindle Motor 102, this Spindle Motor are used to make disk 101 rotations.Voice coil motor arm 104 magnetic head fold piece combination of carrying (HGA) 100, described magnetic head fold piece combination 100 comprises the microdrive 105 of the magnetic head 103 that is integrated with read/write head.A voice coil motor (VCM) is in order to the motion of control voice coil motor arm 104, and then control head 103 moves to another track from a track on disk 101 surfaces, thereby read/write head is read and write data on disk 101.Disc drive unit when running, be integrated with between the disk 101 of the magnetic head 103 of read/write converter (transducer) and rotation owing to aerodynamic action produces a lift.This lift is balance mutually with the elastic force opposite sign but equal magnitude that is applied by the cantilever of magnetic head fold piece combination 100, and in the overall diameter stroke of motor arm 104, a predetermined flying height just maintains on the surface of spinning disk 101 like this.
Figure 2 shows that the magnetic head fold piece combination 100 of the disc drive unit that contains dual drive among Fig. 1.Yet because the intrinsic tolerance of voice coil motor and magnetic head cantilever combination, magnetic head 103 can't be realized fast and accurate position control, and then influence the performance that read/write head accurately reads and writes data on disk.For this reason, increase above-mentioned piezo-electric micro driver 105, so that improve the position control accuracy of magnetic head and read/write head.More particularly, with respect to voice coil motor driver, this piezo-electric micro driver is adjusted the displacement of magnetic head 103 with littler amplitude, so that compensate the foozle of voice coil motor and/or magnetic head cantilever combination.This piezo-electric micro driver makes that using littler track pitch becomes possibility, and the track density (TPI, the track quantity that per inch is contained) of disc drive unit can be improved 50%, can reduce seeking rail and positioning time of magnetic head simultaneously.Therefore, piezo-electric micro driver can increase substantially the memory capacity of memory disc.
As shown in Figure 2, this magnetic head fold piece combination 100 comprises that one has the cantilever 106 of flexible element 108.This flexible element 108 has cantilever tongue piece 110 and is used to carry piezo-electric micro driver 105 and magnetic head 103.Outwards outstanding two leads 112,114 that are provided with in cantilever tongue piece 110 both sides of this flexible element 108.One end of each lead is connected on the portable plate 116, and the other end is connected on the many leads 118, these many leads 118 and connecting terminal 120 interconnection.
With reference to figure 3, traditional piezo-electric micro driver 105 comprises metal framework 130, and this metal framework 130 comprises top board 132, base plate 134 and the two side arms 136,138 that top board 132, base plate 134 are coupled together.Be separately installed with piezoelectric unit 140,142 on the two side arms 136,138.Magnetic head 103 is installed on the top board 132.
With reference to figure 4, this piezo-electric micro driver 105 is by the base plate 134 of its metal framework 130 and be installed on the cantilever tongue piece 110.This base plate 134 can be fixed on the cantilever tongue piece 110 by the mode of epoxide-resin glue or laser bonding.Three are electrically connected and receive 150 (gold goal connects or the tin ball connects GBB or SBB) is fixed on piezo-electric micro driver 105 on the cantilever lead 118 of piezoelectric unit 140,142 both sides.In addition, a plurality of be electrically connected receive such as four be electrically connected receive (GBB or SBB) magnetic head 103 is connected on the cantilever lead 118 so that electrically connect read-write cell on the magnetic head 103.When applying voltage by 118 pairs of piezoelectric units of cantilever lead 140,142, piezoelectric unit 140,142 shrinks or expansion causes its side arm 136,138 lateral thrusts.This bending causes metal framework 130 to produce detrusion, promptly the shape of this metal framework 130 becomes parallelogram by rectangle, thereby cause the motion of top board 132, cause being installed in magnetic head 103 on the top board 132 then, make the position that accurately to adjust read/write head along the disk orbital motion.In the above described manner, can realize the may command displacement of magnetic head and be used for fine position.
Figure 5 shows that voltage is applied to the process of piezoelectric unit these piezo-electric micro driver 105 starts in 140,142 o'clock.Such as, when on the piezoelectric unit 140 that sinusoidal voltage is applied to the piezo-electric micro driver with positive polarity in first semiperiod, this piezoelectric unit 140 will shrink and cause side arm 136 to produce wavy distortion.Because magnetic head 103 is installed on the top board 132, this distortion will impel magnetic head to be moved to the left.Similar ground, when on the piezoelectric unit 142 that sinusoidal voltage is applied to the piezo-electric micro driver with positive polarity in second cycle, this piezoelectric unit 142 will shrink and cause the wavy distortion of side arm 138 generations.This distortion will impel magnetic head to move right.Above-mentioned motion depends on the polar orientation of piezo-electric micro driver piezoelectric unit and the situation that voltage applies, but its principle of work is well-known.
Because piezo-electric micro driver 105 moves in the swing mode, when working, piezo-electric micro driver will produce cantilever part resonance.Described cantilever part resonance has limited the performance of disk drive.
For example, Fig. 6 has showed the resonance test data of existing piezo-electric micro driver.As shown in the figure, when piezo-electric micro driver is worked (exciting piezoelectric patches), the relatively large reacting force of cantilever part can produce cantilever part, and it shakes.Wherein, curve 160 has been showed the resonance situation when the cantilever part substrate is shaken or is excited, and curve 170 has then been showed the resonance situation the when piezoelectric element of microdrive is excited.
In addition be ceramic structure because be used for the piezoelectric element of microdrive, thereby the fragility of stupalith in addition piezoelectric element be applied under the voltage condition continual back and forth the distortion can produce ceramic particle (particle).Particulate in the disk drive can cause the badly damaged of magnetic head and/or disk, and therefore, particulate control is strict, the real necessity that belongs to of no particulate design.
Because the limitation of piezoelectric ceramics characteristic, in order to guarantee enough displacement drive magnetic heads, people have to use higher voltage or multilayer piezoelectric element.But, high voltage for the control system of disk drive, be difficult to realize and also electric energy loss higher.Multilayer piezoelectric element can make the volume (mass) of microdrive increase.These shortcomings all will have influence on the static state and the dynamic property of magnetic head, for example anti-seismic performance.
In addition, the multi-layer ceramics piezoelectric element manufactures also relatively more expensive.Therefore, in order to reduce cost the real necessity that belongs to of the structure of improvement microdrive.
In sum, one of invention can overcome real necessity that belongs to of improved system of above-mentioned shortcoming.
Summary of the invention
One aspect of the present invention relates to a kind of microdrive that is intended to improve magnetic head fold piece combination (HGA) resonance performance (resonance performance).
The present invention relates to a kind of microdrive that is used for magnetic head fold piece combination on the other hand.Described microdrive comprises metal framework, and described metal framework comprises: the bottom support that is connected with the cantilever part of magnetic head fold piece combination; Support the top support of the magnetic head on the magnetic head fold piece combination; With a pair of side arm that is connected described bottom support and described top support, described side arm is vertically stretched from described bottom support and the corresponding side of described top support; And be installed in piezoelectric element on described each side arm, described each piezoelectric element comprises two by polyimide (the English polyimide of being, be abbreviated as PI) piezoelectric part of substrate support, described PI substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately; Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
The present invention relates to a kind of microdrive that is used for magnetic head fold piece combination on the other hand.Described microdrive comprises the metal framework of N shape, and described N shape metal framework comprises: a pair of side arm; Plate body; With a plurality of linking arms that are connected described plate body and described a pair of side arm; And be installed in piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts by the PI substrate support, described PI substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately; Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
Further aspect of the present invention relates to a kind of magnetic head fold piece combination, and this magnetic head fold piece combination comprises the cantilever part of described microdrive of microdrive, magnetic head and support and described magnetic head.Described microdrive comprises metal framework, and described metal framework comprises: the bottom support that is connected with the cantilever part of magnetic head fold piece combination; Support the top support of the magnetic head on the magnetic head fold piece combination; With a pair of side arm that is connected described bottom support and described top support, described side arm is vertically stretched from described bottom support and the corresponding side of described top support; And be installed in piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts by the PI substrate support, described PI substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately; Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
Another aspect of the invention relates to a kind of disk drive, and this disk drive comprises: magnetic head fold piece combination, described magnetic head fold piece combination comprise the cantilever part of microdrive, magnetic head, the described microdrive of support and described magnetic head; The actuating arm that is connected with described magnetic head fold piece combination; Disk; With the Spindle Motor that is used to drive described disk rotation.Described microdrive comprises: metal framework, and described metal framework comprises: the bottom support that is connected with the cantilever part of magnetic head fold piece combination; Support the top support of the magnetic head on the magnetic head fold piece combination; With a pair of side arm that is connected described bottom support and described top support, described side arm is vertically stretched from described bottom support and the corresponding side of described top support; And be installed in piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts by the PI substrate support, described PI substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately; Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
Others of the present invention, feature and advantage will provide in the following embodiments in conjunction with the accompanying drawings in detail, and accompanying drawing is the part of exposure of the present invention and illustration content.
Description of drawings
Fig. 1 is the stereographic map of existing disc drive unit;
Fig. 2 is the stereographic map of existing magnetic head fold piece combination (HGA);
Fig. 3 is the magnetic head of the magnetic head fold piece combination among Fig. 2 and the stereographic map of piezo-electric micro driver;
Fig. 4 is the partial perspective view of the magnetic head fold piece combination among Fig. 2;
Fig. 5 is the magnetic head of the magnetic head fold piece combination among Fig. 2 and the vertical view of piezo-electric micro driver;
Fig. 6 is a kind of resonance test data figure of existing piezo-electric micro driver;
Fig. 7 is the stereographic map of the magnetic head fold piece combination that comprises piezo-electric micro driver in one embodiment of the present of invention;
Fig. 8 is the partial perspective view of magnetic head fold piece combination among Fig. 7;
Fig. 9 is the side view of magnetic head fold piece combination among Fig. 8;
Figure 10 is the exploded view of magnetic head fold piece combination among Fig. 8;
Figure 11 is the stereographic map of the piezo-electric micro driver that shifts out from magnetic head and magnetic head fold piece combination among Fig. 7;
Figure 12 is the exploded view of the piezo-electric micro driver among Figure 11;
Figure 13 is the vertical view of the piezoelectric element of the piezo-electric micro driver among Figure 11;
Figure 14 is the cut-open view of Figure 13 along the 14-14 line;
Figure 15 is the electric connection structure synoptic diagram between the piezoelectric part in the piezoelectric element among Figure 13;
Figure 16 a is an embodiment synoptic diagram of the electric connection structure between the piezoelectric element of the piezo-electric micro driver among Fig. 7;
Figure 16 b is the synoptic diagram of the piezoelectric element of the piezo-electric micro driver among Fig. 7 when being applied in voltage;
Figure 16 c is the magnetic head and the vertical view of piezo-electric micro driver when having used the electric connection structure shown in Figure 16 a and Figure 16 b and having applied voltage of the magnetic head fold piece combination among Fig. 7;
Figure 17 a is the synoptic diagram of another embodiment of the electric connection structure between the piezoelectric element of the piezo-electric micro driver among Fig. 7;
Figure 17 b is the synoptic diagram of the piezoelectric element of the piezo-electric micro driver among Fig. 7 when being applied in another voltage;
Figure 17 c is the magnetic head and the vertical view of piezo-electric micro driver when having used the electric connection structure shown in Figure 17 a and Figure 17 b and having applied voltage of the magnetic head fold piece combination among Fig. 7;
Figure 18 is the resonance test data figure of the piezo-electric micro driver among Fig. 7;
Figure 19 is the stereographic map of the piezo-electric micro driver among another embodiment of the present invention;
Figure 20 is the vertical view of the piezoelectric element of the piezo-electric micro driver among Figure 19;
Figure 21 is along the cut-open view of 21-21 line among Figure 20;
Figure 22 is the electric connection structure synoptic diagram between the piezoelectric part of the piezoelectric element among Figure 19;
Figure 23 is the exploded view of the piezo-electric micro driver that provides of another embodiment of the present invention;
Figure 24 is the stereographic map of the piezo-electric micro driver among Figure 23 when being installed on the cantilever part of magnetic head fold piece combination;
Figure 25 is the magnetic head that provides in the another embodiment of the present invention and the exploded view of piezo-electric micro driver; With
Figure 26 is the exploded view of the piezo-electric micro driver that provides in further embodiment of this invention.
Embodiment
Describe several preferred embodiments of the present invention in detail below in conjunction with accompanying drawing, label identical in the accompanying drawing is represented identical parts in different figure.As previously mentioned, the present invention is intended to improve the resonance performance of magnetic head fold piece combination (HGA), uses microdrive to drive magnetic head accurately simultaneously.One aspect of the present invention provides a kind of rotatable film piezo-electric (PZT) microdrive that is intended to improve HGA resonance performance.By improving the resonance performance of HGA, thereby improve the serviceability of disk drive.
The embodiment of the microdrive of several HGA of being used for will be described below.What deserves to be explained is that no matter the concrete structure of the HGA that provides among the figure how, microdrive can be installed on those disk drives that are fit to and be used for alleviating cable vibration (trace vibration).Therefore, the present invention can be applied on any suitable device that is provided with microdrive.
Fig. 7-18 illustrates a kind of HGA 210 that piezo-electric micro driver 212 is installed that first embodiment of the invention provides.Described HGA 210 comprises piezo-electric micro driver 212, magnetic head 214 and loads or hang the cantilever part 216 of described piezo-electric micro driver 212 and described magnetic head 214.
With reference to the accompanying drawings, described cantilever part 216 comprises substrate 218, load beam 220, pivot member 222, flexible element 224 and is positioned at cantilever cable 226 and outer cantilever cable 227 on the flexible element 224.Described substrate 218 comprises a mounting hole 228, is used for cantilever part 216 is connected to actuating arm on the voice coil motor (VCM) of disk drive.The profile of substrate 218 depends on the structure and the type of disk drive.And substrate 218 is the most handy relatively than the material of hard or rigidity, and for example metal manufacturing is to guarantee stably to support the cantilever part 216 on the actuating arm that is positioned at VCM.
Described pivot member 222 is installed on substrate 218 and the load beam 220 by the mode of for example welding.With reference to the accompanying drawings, described pivot member 222 is provided with a mounting hole 230, and the mounting hole 228 on this mounting hole 230 and the substrate 218 is complementary.Pivot member 222 comprises that also one keeps bar 232, is used to support described load beam 220.
Described flexible element 224 is installed on pivot member 222 and the load beam 220 by laminating (lamination) or welding manner.Described flexible element 224 also is provided with a cantilevered tab 238, is used for piezo-electric micro driver 212 is connected (see figure 10) with cantilever part 216.Described cantilevered tab 238 matches with kick 234 on the described load beam 220.In addition, described cantilever cable 226,227 is located on the described flexible element 224, is used for the piezoelectric element on plural connecting terminal 240 (linking to each other with external control system) and magnetic head 214 and the piezo-electric micro driver 212 242,243 is electrically connected.Described cantilever cable 226,227 can be flexible print circuit (FPC), and can comprise the lead of proper number.
As Fig. 8 and shown in Figure 10, plural connecting terminal 244 is directly linked on the inner cantilever cable 226, thereby the plural connecting terminal on inner cantilever cable 226 and the piezoelectric element 242,243 246 is electrically connected.In addition, plural connecting terminal 248 is directly linked on the outside cantilever cable 227, thereby the plural connecting terminal on outside cantilever cable 227 and the magnetic head 214 250 is electrically connected.
Be provided with a voice coil motor (VCM) in the disk drive, be used for driving actuating arm controlledly, and then drive HGA 210 so that HGA 210 will have the magnetic head 214 of read/write head places on any customizing messages track on the disk in the disk drive.Described piezo-electric micro driver 212 can make disk drive have faster and better position control when work, and shortens magnetic head and seek rail and positioning time.Therefore when HGA 210 was introduced into disk drive, a dual drive system had just formed, and wherein the VCM driver is made big position adjustment piezo-electric micro driver to read/write head and then read/write head finely tuned.
Figure 11 and Figure 12 illustrate the piezo-electric micro driver 212 that takes out from magnetic head 214 and cantilever part 216.As shown in the figure, described piezo-electric micro driver 212 comprises microdrive framework 252 and the piezoelectric element 242,243 that is installed on this microdrive framework 252.Described microdrive framework 252 comprises top support 254, bottom support 256 and the side arm 258,259 that connects top support 254 and bottom support 256.Described top support 254 comprises rotatable plate body 260 and plate body 260 is connected to linking arm or bridge 262,264 on the corresponding side arm 258,259.Piezoelectric element 242,243 is installed on the corresponding side arm 258,259 of microdrive framework 252.Described microdrive framework 252 can be with any suitable material, metal for example, and make by any suitable technology.
With reference to Figure 12, described side arm 258,259 is from the opposite side of described top and bottom support 254,256 and form.As shown in the figure, internal recess 257 is formed between bottom support 256 and the corresponding side arm 258,259.So design is in order to make moving of side arm 258,259 free more.
In addition, described bridge 262 has two opposing ends 262a, 262b, and bridge 264 also has two opposing ends 264a, 264b.Described terminal 262a, 264a link to each other with rotatable plate body 260, and terminal 262b, 264b then link to each other with corresponding side arm 258,259 respectively.In one embodiment, described terminal 262b links to each other with the same position of corresponding side arm 258,259 on Y direction with 264b, and terminal 262a, 264a are that benchmark is the mirror image symmetry and links to each other with rotatable plate body 260 with the center of rotatable plate body 260 then.
With reference to Figure 13 and Figure 14, each piezoelectric element 242,243 all comprises two piezoelectric parts 266,268 that supported by PI substrate 270.Described PI substrate 270 is by partially-etched and by several narrow bridges 272, for example two narrow bridges couple together piezoelectric part 266,268.The narrow bridge 272 flexible (seeing Figure 11 and Figure 12) of described PI substrate 270, thus piezoelectric element 242,243 can be installed on the microdrive 252 corresponding side arms 258,259.After installing, piezoelectric part 266,268 just is clipped in the middle side arm 258,259 respectively and extends on the respective side of each side arm 258,259, as shown in figure 11.In addition, be provided with plural connecting terminal 246 on piezoelectric element 242,243, for example two connecting terminals are used for piezoelectric element 242,243 and interior cantilever cable 226 are electrically connected.
Described piezoelectric part 266,268 is plate shaped, can form by overlapping film, and described overlapping film is by piezoelectric, and for example PZT constitutes, and makes electrode with nickel-Yin (Ni-Ag), platinum (Pt) or gold.Described piezoelectric part 266,268 can be single thin film piezoelectric patches or multilayer film piezoelectric patches.
Figure 15 illustrates the piezoelectric part the 266, the 268th on the piezoelectric element 242,243, how to electrically connect.As shown in the figure, described two piezoelectric parts 266 can have different polarised directions with 268 and be connected in parallel.Each piezoelectric part 266,268 all has an end to be connected with connecting terminal 246.
Shown in Fig. 8-10, the structure of bottom support 256 is suitable for connecting microdrive framework 252 and cantilever part 216.Specifically, bottom support 256 is by for example epoxy glue, resin or partly be installed in laser welding method on the cantilevered tab 238 of flexible element 224.In addition, plural connecting terminal 246, for example two connecting terminals are located to be electrically connected on the corresponding piezoelectric element 242,243 and by plural number and are received that corresponding plural connecting terminal 244 electrically connects on (GBB or SBB) and the interior cantilever cable 226.So just can be sent to electric power on the piezoelectric element 242,243 by interior cantilever cable 226.
Described top support 254 is connected microdrive framework 252 with magnetic head 214.Particularly, magnetic head 214 is provided with plural connecting terminal 250 at the one end corresponding to the plural number of the magnetic head on the float plate 276 connecting terminal 248, for example 4 connecting terminals.Described top support 254 is supporting the magnetic head 214 on it, and magnetic head connecting terminal 248 is connected ball 278 (GBB or SBB) with plural connecting terminal 250 on being positioned at magnetic head 214 by complex conduction and electrically connects.So just top support 254 is connected with magnetic head 214, and the outer cantilever cable on magnetic head 214 and read/write element and the cantilever part 216 227 is electrically connected.In addition, form a parallel clearance 280 between cantilevered tab 238 and piezo-electric micro driver 212, it is freer to allow piezo-electric micro driver 212 in use to move, as shown in Figure 9.
Figure 16 a illustrates an embodiment of the electric connection structure between two piezoelectric elements 242,243 of piezo-electric micro driver 212, and Figure 16 b illustrates the situation of the operating voltage of this embodiment.As shown in the figure, two piezoelectric elements with opposed polarity 242,243 are connected in parallel in the side arm both sides, and are applied in a sinusoidal voltage.With reference to figure 16c, in the preceding half period of voltage, the outside piezoelectric part 266 of piezoelectric element 243 shrinks, and its inner piezoelectric part 268 expands, and will cause side arm 259 outwardly-bent like this.Similarly, the outside piezoelectric part 266 of piezoelectric element 242 shrinks and its inner piezoelectric part 268 expansions, will cause side arm 258 outwardly-bent like this.Because two bridges 262,264 and plate body 260 are skew with respect to the center of plate body 260 and are connected (offset relation), and magnetic head 214 parts are installed on the plate body 260, so magnetic head 214 will be axial right rotation with its center line.When voltage to the second semiperiod, the outside piezoelectric part 266 of piezoelectric element 243 expands and its inner piezoelectric part 268 shrinks, and will cause side arm 259 to curve inwardly like this.Similarly, the outside piezoelectric part 266 of piezoelectric element 242 expands and its inner piezoelectric part 268 contractions, will cause side arm 258 to curve inwardly like this.Magnetic head 214 is rotated to the left along its center line.Because side arm 258,259 can be towards the both direction bending, so just can realize the big displacement of magnetic head.
Figure 17 a illustrates another embodiment of electric connection structure between two piezoelectric elements 242,243 of piezo-electric micro driver 212, and Figure 17 b illustrates the operating voltage situation of this embodiment.As shown in the figure, two piezoelectric element 242,243 1 ends with opposed polarity are connected on the same ground wire, and the other end then is divided into two paths.In addition, for example, the sinusoidal voltage of two outs of phase is applied on the piezoelectric element 242,243 on described arbitrary side arm by above-mentioned two paths.With reference to figure 17c, when positive sinusoidal voltage of input, in first semiperiod, the outside piezoelectric part 266 of piezoelectric element 243 shrinks the then expansion of inside piezoelectric part 268 of piezoelectric elements 243, and this can cause side arm 259 outwardly-bent and by 264 pairs of plate bodys of described bridge, 260 generation peeling forces 282 (peel strength).Similarly, the outside piezoelectric part 266 of piezoelectric element 242 shrinks and inside piezoelectric part 268 extensions of piezoelectric element 242, owing to applied the voltage of out of phase, thus cause side arm 258 outwardly-bent.Can produce a peeling force 284 by 262 pairs of plate bodys of described bridge 260 like this.Because peeling force 282,284 is being applied on the plate body 260 on the different directions, and magnetic head 214 partly is installed on the plate body 260, and magnetic head 214 can be the rotation of axial right side with its center line.When voltage arrived second semiperiod, principle of work was identical in fact, and magnetic head 214 will rotate to the left.Because side arm 258,259 can be towards the both direction bending, magnetic head displacement that therefore just can be bigger.
Figure 18 illustrates the resonance test data of piezo-electric micro driver 212.Curve 290 is cantilever part substrate resonance curves when being excited, and the resonance curve that curve 292 is piezoelectric elements 242,243 of piezo-electric micro driver 212 when being excited.
Because piezo-electric micro driver 212 is rotary-type work rather than former oscillating-type work, when piezo-electric micro driver 212 work, the reacting force that puts on the cantilever part is just less relatively.That is to say that piezo-electric micro driver 212 does not have cantilever part resonance-type of the prior art as shown in Figure 6.Therefore, piezo-electric micro driver 212 has greatly improved the performance of disk drive and has had bigger servo bandwidth.
As mentioned above, the Rotation Design of piezo-electric micro driver 212 has been improved the resonance performance.Equally, the use of film piezo-electric sheet provides no particulate piezo-electric micro driver 212, thereby can avoid particulate to damage disk drive.In addition, the structure of piezo-electric micro driver 212 makes low cost of manufacture and the magnetic head that can accurately drive.
Figure 19-22 has showed a kind of piezo-electric micro driver 312 that provides among the another one embodiment of the present invention.In this embodiment, each piezoelectric part 366,368 of piezoelectric element 342,343 comprises two separative elements.Be that piezoelectric part 366 comprises unit 366a and unit 366b as shown in figure 20, and piezoelectric part 368 comprise unit 368a and unit 368b.
With reference to Figure 20 and Figure 21, four unit 366a, 366b, 368a, 368b are had several bendable curved bridges 372 by one, and for example the PI substrate 370 of two narrow bridges is supported.Figure 22 illustrates an embodiment of the electric connection between four unit 366a, 366b, 368a, the 368b.As shown in the figure, the units in series of each piezoelectric part (has the equipolarization direction) together, and piezoelectric part then is connected in parallel.Other parts of piezo-electric micro driver 312 are identical in fact with above-mentioned piezo-electric micro driver 212 corresponding parts and use identical label to indicate.
Figure 23 and Figure 24 illustrate the piezo-electric micro driver 412 that provides in the another embodiment of the present invention.In this embodiment, described microdrive framework 452 is N shape, and it comprises side arm 458,459, plate body 460, is used to connect the linking arm 462,464 of plate body 460 and side arm 458,459.Described piezoelectric element 242,243 is bending, is mounted respectively on corresponding side arm 458,459 also respectively side arm 458,459 to be clamped.Magnetic head 214 is by being contained in its posterior edges (trailing side edge) on the side arm 458, its forward edge (leading side edge) is contained on another side arm 459 and is installed on the framework 452.Described magnetic head can be installed on the framework 452 by suitable mounting material 494.When to piezoelectric element 242,243 input voltages, side arm 458,459 will be crooked and then makes magnetic head 214 rotations.Figure 24 has showed that the piezo-electric micro driver 412 after the assembling is installed to the sight on the cantilever part 216 of type as previously mentioned.Other parts of described piezo-electric micro driver 412 are identical in fact with piezo-electric micro driver 212 corresponding parts and use identical label to indicate.
Figure 25 illustrates a kind of piezo-electric micro driver 512 among another embodiment of the present invention.In this embodiment, described microdrive framework 552 comprises top support 554, bottom support 556 and is connected top support 554 and the side arm of bottom support 556 558,559.Described top support 554 comprises rotatable plate body 560 and described plate body 560 is connected to two bridges 562,564 on the corresponding side arm 558,559.As shown in the figure, described bridge 562,564 is arranged along same axis.Described piezoelectric element 242,243 is installed on the side arm 558,559 corresponding on the microdrive framework 552, and 214 of magnetic heads are installed on the plate body 560.Although the structure difference, the principle of work of the principle of work of piezo-electric micro driver 512 and piezo-electric micro driver 212 is similar in fact.
Figure 26 illustrates a kind of piezo-electric micro driver 612 that another embodiment of the present invention provides.In this embodiment, described microdrive framework 652 comprises integrated cable (integrated traces) 602.Described integrated cable 602 comprises the plural connecting terminal 604 that is positioned at framework 652 trailing edges (trailing edge), and described integrated cable 602 extends through the middle part and the bottom support 656 of the plate body 660 of top support 654.A free line end 606 (free lead) extends to the outside of framework 652, which is provided with plural connecting terminal 608.This embodiment is used to improve the outer cable vibration.
A kind of magnetic head fold piece combination (HGA) 210 with the piezo-electric micro driver 212,312,412,512,612 in the embodiment of the invention can be used for disk drive (HDD).Described HDD can be above-mentioned the sort of type with reference to Fig. 1.Because the structure of disk drive, work and assembling process are well known to those of ordinary skill in the art, repeat no more here.Described piezo-electric micro driver can be applied on any suitable hard disk drive with microdrive or other have on the device of microdrive.In one embodiment, described piezo-electric micro driver is applied in the hyperdisk drive unit.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification and equivalent combinations of carrying out according to essence of the present invention.
Claims (25)
1. microdrive that is used for magnetic head fold piece combination is characterized in that comprising:
Metal framework, described metal framework comprises:
The bottom support that is connected with the cantilever part of magnetic head fold piece combination;
Support the top support of the magnetic head on the magnetic head fold piece combination; With
The a pair of side arm that connects described bottom support and described top support,
Described side arm is vertically stretched from described bottom support and the corresponding side of described top support; And
Be installed in the piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts that supported by the polyimide substrate, described polyimide substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately;
Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
2. microdrive according to claim 1 is characterized in that: described top support comprises rotatable plate body and a plurality of linking arm that described rotatable plate body is connected to described side arm separately.
3. microdrive according to claim 2 is characterized in that: the curved shape structure of described linking arm.
4. microdrive according to claim 2 is characterized in that: described linking arm is arranged on the same axis.
5. microdrive according to claim 1 is characterized in that: described piezoelectric part is single thin film piezoelectric patches or multilayer film piezoelectric patches.
6. microdrive according to claim 1 is characterized in that: described each piezoelectric element comprises one or more connecting terminals, is used for described each piezoelectric element and cantilever cable are electrically connected.
7. microdrive according to claim 1 is characterized in that: described two piezoelectric parts have different polarised directions and are connected in parallel.
8. microdrive according to claim 1 is characterized in that: described each piezoelectric part comprises two unit that separate.
9. microdrive according to claim 1 is characterized in that also comprising integrated cable (integrated trace), and described integrated cable links to each other first group of connecting terminal with second group of connecting terminal.
10. microdrive that is used for magnetic head fold piece combination is characterized in that comprising:
N shape metal framework; Described N shape metal framework comprises:
A pair of side arm;
Plate body; With
The linking arm of described plate body of a plurality of connections and described a pair of side arm; And
Be installed in the piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts that supported by the polyimide substrate, described polyimide substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately;
Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
11. microdrive according to claim 10 is characterized in that: described piezoelectric part is single thin film piezoelectric patches or multilayer film piezoelectric patches.
12. a magnetic head fold piece combination comprises:
The cantilever part of described microdrive of microdrive, magnetic head and support and described magnetic head;
It is characterized in that described microdrive comprises:
Metal framework, described metal framework comprises:
The bottom support that is connected with the cantilever part of magnetic head fold piece combination;
Support the top support of the magnetic head on the magnetic head fold piece combination; With
The a pair of side arm that connects described bottom support and described top support;
Described side arm is vertically stretched from described bottom support and the corresponding side of described top support; And
Be installed in the piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts that supported by the polyimide substrate, described polyimide substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately;
Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
13. a kind of magnetic head fold piece combination according to claim 12 is characterized in that: described top support comprises rotatable plate body and a plurality of linking arm that described rotatable plate body is connected to described side arm.
14. a kind of magnetic head fold piece combination according to claim 13 is characterized in that: the curved shape structure of described linking arm.
15. a kind of magnetic head fold piece combination according to claim 13 is characterized in that: described linking arm is arranged on the same axis.
16. a kind of magnetic head fold piece combination according to claim 12 is characterized in that: described magnetic head comprises a read/write cell that is used for magnetic recording.
17. a kind of magnetic head fold piece combination according to claim 12 is characterized in that: described bottom support is connected with the cantilevered tab of described cantilever part.
18. a kind of magnetic head fold piece combination according to claim 12 is characterized in that: described piezoelectric part is single thin film piezoelectric patches or multilayer film piezoelectric patches.
19. a kind of magnetic head fold piece combination according to claim 12 is characterized in that: described each piezoelectric element comprises one or more connecting terminals, is used for described each piezoelectric element and cantilever cable are electrically connected.
20. a kind of magnetic head fold piece combination according to claim 12 is characterized in that:
Described two piezoelectric parts have different polarised directions and are connected in parallel.
21. a kind of magnetic head fold piece combination according to claim 12 is characterized in that: described each piezoelectric part comprises two unit that separate.
22. a kind of magnetic head fold piece combination according to claim 12 is characterized in that also comprising integrated cable (integrated trace), described integrated cable links to each other first group of connecting terminal with second group of connecting terminal.
23. a disk drive comprises:
Magnetic head fold piece combination, described magnetic head fold piece combination comprise the cantilever part of microdrive, magnetic head, the described microdrive of support and described magnetic head; The actuating arm that is connected with described magnetic head fold piece combination; Disk; With the Spindle Motor that is used to drive described disk rotation;
It is characterized in that described microdrive comprises:
Metal framework, described metal framework comprises:
The bottom support that is connected with the cantilever part of magnetic head fold piece combination;
Support the top support of the magnetic head on the magnetic head fold piece combination; With
The a pair of side arm that connects described bottom support and described top support,
Described side arm is vertically stretched from described bottom support and the corresponding side of described top support; And
Be installed in the piezoelectric element on described each side arm, described each piezoelectric element comprises two piezoelectric parts that supported by the polyimide substrate, described polyimide substrate comprises one or more physics and electrically connects the bridge of described piezoelectric part, and described bridge is flexible so that can this side arm of clamping when described two piezoelectric parts are installed on the described side arm separately;
Described each piezoelectric element can be excited and move with the selectivity that causes described side arm.
24. a kind of disk drive according to claim 23 is characterized in that: described top support comprises rotatable plate body and a plurality of linking arm that described rotatable plate body is connected to described side arm.
25. a kind of disk drive according to claim 23 is characterized in that: described piezoelectric part is single thin film piezoelectric patches or multilayer film piezoelectric patches.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100967519A CN100535994C (en) | 2005-08-25 | 2005-08-25 | Micro-driver and magnetic head folding sheet combination for magnetic disc driving device |
| JP2006228187A JP2007059049A (en) | 2005-08-25 | 2006-08-24 | Micro-actuator used for disk drive apparatus, and head gimbal assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100967519A CN100535994C (en) | 2005-08-25 | 2005-08-25 | Micro-driver and magnetic head folding sheet combination for magnetic disc driving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1920959A CN1920959A (en) | 2007-02-28 |
| CN100535994C true CN100535994C (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100967519A Expired - Fee Related CN100535994C (en) | 2005-08-25 | 2005-08-25 | Micro-driver and magnetic head folding sheet combination for magnetic disc driving device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2007059049A (en) |
| CN (1) | CN100535994C (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321983A (en) * | 2000-02-01 | 2001-11-14 | 松下电器产业株式会社 | Head Support Mechanism and Thin Film Piezo Actuator |
-
2005
- 2005-08-25 CN CNB2005100967519A patent/CN100535994C/en not_active Expired - Fee Related
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2006
- 2006-08-24 JP JP2006228187A patent/JP2007059049A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321983A (en) * | 2000-02-01 | 2001-11-14 | 松下电器产业株式会社 | Head Support Mechanism and Thin Film Piezo Actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007059049A (en) | 2007-03-08 |
| CN1920959A (en) | 2007-02-28 |
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