CN101083084A - Micro-driver and magnetic head tabs assembly and magnetic disk drive unit - Google Patents
Micro-driver and magnetic head tabs assembly and magnetic disk drive unit Download PDFInfo
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- CN101083084A CN101083084A CN 200610091511 CN200610091511A CN101083084A CN 101083084 A CN101083084 A CN 101083084A CN 200610091511 CN200610091511 CN 200610091511 CN 200610091511 A CN200610091511 A CN 200610091511A CN 101083084 A CN101083084 A CN 101083084A
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- magnetic head
- piezoelectric element
- linking arm
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Abstract
The invention discloses a micro-driver of head tabs composition, which comprises the following parts: at least one piezoelectric element, connecting arm to support the piezoelectric element, micro-driver assembling part at one end of the connecting arm, head assembling part to connect the other end of the connecting arm or piezoelectric element, wherein the breadth of piezoelectric element is more than the breadth of the connecting arm; the piezoelectric element can be excited to guide selective movement of connecting arm. The invention also provides a head tabs combination and disc driving unit with micro-driver.
Description
Technical field
The present invention relates to a kind of information recording disk driver element, relate more specifically to a kind of microdrive, contain this microdrive magnetic head fold piece combination (head gimbal assembly, HGA) and disc drive unit.
Background technology
A kind of common information storing device is a disk drive system, and it uses magnetic media to store data and the removable read/write head that is arranged at this magnetic media top comes optionally on the magnetic media reading of data or data are write on the magnetic media.
The consumer always wishes that the memory capacity of this class disk drive system constantly increases, and wishes that simultaneously its read or write speed is faster more accurate.Therefore disc drive manufacturers is devoted to develop the disk system 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 raising to 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 position control accuracy and the speed that realizes read/write head with a master driver.The disk system that comprises microdrive is called as Dual-drive system.
Once developed many Dual-drive systems that are used to improve access speed and read/write head bearing accuracy 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 piezo-electric micro driver (be piezo-electric micro driver, be designated hereinafter simply as piezo-electric micro driver).This voice coil motor driver is controlled by servo-control system, and this servo-control system causes the actuating arm rotation, and the carrying read/write head is so that be positioned read/write head on the track of memory disc on this actuating arm.Piezo-electric micro driver and voice coil motor driver are used common raising access speed and realize the fine setting of read/write head in track location.Voice coil motor driver is to the position coarse adjustment of read/write head, and piezo-electric micro driver is to the accurate adjustment of read/write head with respect to the position of disk.By the cooperation of two drivers, realize data efficient and accurate read-write operation on memory disc jointly.
A kind of known being used to realizes the microdrive of read/write head fine position is included piezoelectric element.This piezo-electric micro driver has relevant electronic installation, and this electronic installation can cause the piezoelectric element on the microdrive optionally to shrink or expand.Piezo-electric micro driver has suitable 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 disk system of only using 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 piezo-electric micro driver 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 system of this magnetic head fold piece combination and the manufacture method of this magnetic head fold piece combination ".The exemplary piezo-electric micro driver of this class is exposed in other patent simultaneously, such as United States Patent (USP) the 6th, 671, and 131 and 6,700,749.
Fig. 1 a-1b is depicted as traditional disc drive unit, and disk 101 is installed on the Spindle Motor 102 and by its rotation.Carry the magnetic head fold piece combination 100 that is provided with magnetic head 103 on the voice coil motor arm 104.The motion of one voice coil motor, 109 control voice coil motor arms 104, and then control head 103 moving between the lip-deep track of disk 101 finally realize read/write head data write on disk 101.When running status, form aerodynamic force between the disk 101 of the magnetic head 103 that comprises read/write head and rotation and contact, and produce lift.The mutual balance of elastic force that the cantilever by magnetic head fold piece combination 100 of this lift and opposite sign but equal magnitude applies, and then cause in the whole radial stroke of motor arm 104, the surface of the disk 101 of rotation forms and keeps predetermined flying height.
Fig. 2 a has showed the magnetic head fold piece combination 100 of traditional magnetic disk driver element shown in Fig. 1 a-1b, the cantilever part 113 that it comprises microdrive 105, is arranged on the magnetic head 103 in this microdrive 105 and carries microdrive 105 and magnetic head 103.Described cantilever part 113 is assembled mutually by substrate 114, articulated part 115, load beam 116 and flexible element 117.Yet because the inherent error of voice coil motor and magnetic head cantilever combination, magnetic head 103 can't be realized fast and accurate position control on the contrary, but influences the performance that read/write head is is accurately read and write data on the 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 voice coil motor relatively, this piezo-electric micro driver 105 is adjusted the displacement of magnetic head 103 with littler amplitude, so as the compensation voice coil motor and (or) resonance error of magnetic head cantilever combination.This piezo-electric micro driver makes that using littler track pitch becomes possibility, and can be with the track density (TPI of disk system, the contained track quantity of per inch) improve 50%, can reduce the seek time (seeking time) and the positioning time (settling time) of magnetic head simultaneously.Therefore, piezo-electric micro driver can increase substantially the surface recording density of memory disc.
With reference to figure 2a-2c, traditional piezo-electric micro driver 105 comprises the U-shaped ceramic frame with two ceramic limit arms 107, and a pair of piezoelectric element 130 is respectively installed on the sidewall of described ceramic limit arm 107.Described magnetic head 103 is fixed to partly between described two ceramic limit arms 107 such as two epoxy points (figure does not show), and makes magnetic head 103 produce displacement by the motion of described limit arm 107 by suitable mode.Described piezo-electric micro driver 105 physically is connected on the cantilever tongue piece 122 of cantilever part 113 (with reference to figure 2c).Three are electrically connected and receive 124 (gold goal welding or tin ball bonding meet gold ball bonding or solder ball bonding, GBB or SBB) are fixed on this piezo-electric micro driver 105 on the cantilever lead 119 that is positioned at arm 107 both sides, ceramic limit.In addition, four Metal Ball 125 (gold goal welding or tin ball bonding connect) are installed to outer cantilever lead 118 with magnetic head 103.
With reference to figure 2c, has the salient point 121 that cooperates with cantilever tongue piece 122 on the load beam 116 of described cantilever part 113.Between cantilever tongue piece 122 and microdrive 105, form a parallel clearance, make that microdrive 105 can freely move when voltage is input to the piezoelectric element of described microdrive 105.
Yet, in above-mentioned traditional microdrive structural design, because piezoelectric element 130 is installed on the Width surface of both sides arm 107 of U-shaped framework, and limit arm 107 Widths one side is pressed close to cantilever tongue piece 122, opposite side is pressed close to disk 101, so piezoelectric element 130 can't extend to both sides on Width, usually the width with the limit arm 107 that supports it is identical or narrow slightly, so just make the deformability of piezoelectric element be restricted, have influence on the position adjustment capability of 105 pairs of magnetic heads 103 of microdrive then.
On the other hand, in above-mentioned traditional microdrive structural design, magnetic head and piezoelectric element all are installed to the U-shaped frame facet.In assembling process, owing to be subjected to the restriction of installing space, this side mounting means is difficult to guarantee the position assembly precision of magnetic head and/or piezoelectric element, and the installation process complexity.
In addition, because a restriction and an end that magnetic head 103 is subjected to the U-shaped framework of microdrive 105 are fixed, thereby can't realize big head position adjustment in traditional microdrive structural design.
Therefore be necessary to provide a kind of improved microdrive to overcome the deficiencies in the prior art.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of microdrive with big width piezoelectric element, makes piezoelectric element can obtain distortion by a relatively large margin, thereby improves the position control ability of microdrive to magnetic head.
Another object of the present invention is to provide a kind of microdrive, manufacturing and assemble flow that it can simplify microdrive reduce cost.
For achieving the above object, the invention provides a kind of microdrive that is used for magnetic head fold piece combination, comprising: at least one piezoelectric element; Support the linking arm of described piezoelectric element; Be located at the microdrive installation portion of described linking arm one end; And the magnetic head installation portion that is connected with the other end or the piezoelectric element of described linking arm.The width of described piezoelectric element is greater than the width of described linking arm, and described piezoelectric element can be excited and cause the selectivity of described linking arm to be moved.
In one embodiment of the invention, the quantity of described linking arm is two, and two linking arms are parallel to each other and perpendicular to magnetic head installation portion and microdrive installation portion.Also offer the notch that is used to increase the magnetic head oscillating quantity on the described piezoelectric element.
In another embodiment of the present invention, described microdrive installation portion comprises holding parts that is connected with described linking arm and the spacer portion that is connected with this holding parts.Described magnetic head installation portion is used between face that magnetic head installs and the described piezoelectric element difference in height being arranged.Described magnetic head installation portion also comprises a stress elimination portion.
As one embodiment of the invention, described microdrive also comprises at least one compressing tablet, and described piezoelectric element is located between described linking arm and the compressing tablet.Also be provided with the reinforcement that is used to strengthen microdrive intensity on the described magnetic head installation portion.Described piezoelectric element is membrane piezoelectric element, ceraminator or PMN-PT (PMN-PT) piezoelectric element.
Described piezoelectric element is single layer structure or sandwich construction.Described microdrive installation portion and described linking arm are integral structure or are connected by the physical connection mode.
A kind of magnetic head fold piece combination that is used for disc drive unit of the present invention comprises microdrive, magnetic head and supports the cantilever part of described microdrive and magnetic head.This microdrive comprises at least one piezoelectric element; Support the linking arm of described piezoelectric element; Be located at the microdrive installation portion of an end of described linking arm; And the magnetic head installation portion that is connected with the other end or the piezoelectric element of described linking arm.The width of described piezoelectric element is greater than the width of described linking arm, and described piezoelectric element can be excited and cause the selectivity of described linking arm to be moved.
A kind of disc drive unit of the present invention comprises: by microdrive, magnetic head and support the magnetic head fold piece combination that the cantilever part of microdrive and magnetic head is formed; The actuating arm that is connected with described magnetic head fold piece combination; Disk; And be used to drive the Spindle Motor of described disk.Wherein, this microdrive comprises at least one piezoelectric element; Support the linking arm of described piezoelectric element; Be located at the microdrive installation portion of an end of described linking arm; And the magnetic head installation portion that is connected with the other end or the piezoelectric element of described linking arm.The width of described piezoelectric element is greater than the width of described linking arm, and described piezoelectric element can be excited and cause the selectivity of described linking arm to be moved.
Compared with prior art, because microdrive of the present invention has the piezoelectric element of big width, thereby makes piezoelectric element can obtain distortion by a larger margin under the situation that does not increase the number of plies or thickness, and then increased the head position setting range; In addition, owing to be up and down assembly relation but not side assembly relation between each building block of microdrive of the present invention, so simplified assemble flow, reduced assembly cost.In addition, described microdrive is less to the restriction of magnetic head, and the end of magnetic head is not fixed, thereby microdrive can be bigger to the position adjustment range of magnetic head.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 a is the stereographic map of traditional magnetic disk driver element.
Fig. 1 b is the partial perspective view of traditional magnetic disk driver element shown in Fig. 1 a.
Fig. 2 a is the stereographic map of traditional magnetic head fold piece combination.
Fig. 2 b is the local view of apparatus of magnetic head fold piece combination shown in Fig. 2 a.
Fig. 2 c is the partial side view of magnetic head fold piece combination shown in Fig. 2 b.
Fig. 3 a is the partial perspective view of the described magnetic head fold piece combination of one embodiment of the invention.
Fig. 3 b is the three-dimensional exploded view of magnetic head fold piece combination shown in Fig. 3 a.
Fig. 3 c is the partial side view of magnetic head fold piece combination shown in Fig. 3 a.
Fig. 3 d is the partial perspective view of the cantilever part of magnetic head fold piece combination shown in Fig. 3 a.
Fig. 3 e is the partial perspective view of the described cantilever part of another embodiment of the present invention.
Fig. 4 a is the stereographic map of the described microdrive of one embodiment of the invention from top view.
Fig. 4 b is the stereographic map that microdrive shown in Fig. 4 a is observed from the bottom.
Fig. 4 c is the three-dimensional exploded view of microdrive shown in Fig. 4 a.
Fig. 4 d is the more detailed three-dimensional exploded view of microdrive shown in Fig. 4 a.
Fig. 4 e is the piezoelectric element of microdrive shown in Fig. 4 a and the stereographic map that linking arm fits together.
Fig. 4 f is the stereographic map that structure shown in Fig. 4 e is observed from another angle.
Fig. 5 a is the stereographic map of the piezoelectric element of microdrive shown in Fig. 4 a.
Fig. 5 b is the stereographic map that the piezoelectric element of microdrive shown in Fig. 4 a is observed from another angle.
Fig. 5 c is the stereographic map of the described piezoelectric element of another embodiment of the present invention.
Fig. 6 a is the stereoscopic-state figure after microdrive shown in Fig. 4 a is installed magnetic head.
Fig. 6 b is the stereographic map that structure shown in Fig. 6 a is observed from the bottom.
Fig. 6 c is the three-dimensional exploded view of microdrive shown in Fig. 6 a and magnetic head.
Fig. 6 d is the three-dimensional exploded view that microdrive shown in Fig. 6 a and magnetic head are observed from the bottom.
Fig. 6 e is microdrive shown in Fig. 6 a and the magnetic head three-dimensional exploded view from top view.
Fig. 7 a and Fig. 7 b have showed two kinds of different working methods of two piezoelectric elements shown in Fig. 4 a respectively, and described two kinds of different working methods can make magnetic head move to the left or to the right.
Fig. 8 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Fig. 8 b is the stereoscopic-state figure after microdrive shown in Fig. 8 a is installed magnetic head.
Fig. 9 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Fig. 9 b is the stereoscopic-state figure after microdrive shown in Fig. 9 a is installed magnetic head.
Figure 10 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Figure 10 b is the stereographic map of the framework of microdrive shown in Figure 10 a.
Figure 10 c is the stereoscopic-state figure after microdrive shown in Figure 10 a is installed magnetic head.
Figure 10 d is the stereoscopic-state figure after microdrive shown in Figure 10 a is installed magnetic head.
Figure 11 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Figure 11 b is the stereographic map of the framework of microdrive shown in Figure 11 a.
Figure 11 c is the stereoscopic-state figure after microdrive shown in Figure 11 a is installed magnetic head.
Figure 12 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Figure 12 b is the stereoscopic-state figure after microdrive shown in Figure 12 a is installed magnetic head.
Figure 13 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Figure 13 b is the stereoscopic-state figure after microdrive shown in Figure 13 a is installed magnetic head.
Figure 14 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Figure 14 b is the stereoscopic-state figure after microdrive shown in Figure 14 a is installed magnetic head.
Figure 15 a is the stereographic map of the described microdrive of another embodiment of the present invention.
Figure 15 b is the stereoscopic-state figure after microdrive shown in Figure 15 a is installed magnetic head.
Figure 15 c is the stereographic map of the framework of microdrive shown in Figure 15 a.
Figure 16 a is the stereographic map of the described framework of another embodiment of the present invention.
Figure 16 b is the stereographic map of the described framework of another embodiment of the present invention.
Figure 16 c is the stereographic map of the described framework of another embodiment of the present invention.
Figure 16 d is the stereographic map of the described framework of another embodiment of the present invention.
Figure 17 is the stereographic map of the described disc drive unit of one embodiment of the invention.
Embodiment
Several embodiment of microdrive of the present invention are described now.It should be noted that described microdrive can be applicable in any magnetic disk drive with microdrive, and be not limited to the ad hoc structure shown in the accompanying drawing.Be that the present invention is applicable to any suitable equipment that contains microdrive in any field.
Fig. 3 a-7b has showed the described microdrive of one embodiment of the invention, and wherein, Fig. 3 a-3c has showed this microdrive is installed to a state after the magnetic head fold piece combination that Fig. 3 d has showed the partial perspective view of the cantilever part of magnetic head fold piece combination shown in Fig. 3 a.As shown in the figure, this magnetic head fold piece combination 200 comprises piezo-electric micro driver 205, is installed in the magnetic head 203 on this piezo-electric micro driver 205 and is used to support the cantilever part 213 of described piezo-electric micro driver 205 and magnetic head 203.
Described cantilever part 213 has load beam 216 and the flexible element 217 that fits together mutually.One end of described flexible element 217 forms cantilever tongue piece 231 and suspension board 215.Carrying microdrive 205 on the described cantilever tongue piece 231.Have on the described cantilever tongue piece 231 a plurality of, such as four electrical connection contacts 236 that contact 235 electrically connects that are electrically connected that are used for described microdrive 205.Form on the described suspension board 215 a plurality of, such as four electrical connection contacts 234 (with reference to figure 3d) that contact (figure does not show) electrically connects that are electrically connected that are used for magnetic head 203.Described flexible element 217 also comprises a cantilever lead 219 and an external cantilever lead 218 in a couple who is arranged at its both sides.An end of cantilever lead 219 and an external control system (figure does not show) electrically connect in described, and the other end is connected with described electrical connection contact 236; One end of described outer cantilever lead 218 is connected with the said external control system, and the contact 234 that is electrically connected on the other end and the described suspension board 215 electrically connects.Described external control system is realized the control to magnetic head 203 and microdrive 205 by described inside and outside cantilever lead, thereby realizes data read-write control.In addition, form the salient point 221 that cooperates with described cantilever tongue piece 231 on the described load beam 216.
The electrical connection contact 235 of above-mentioned microdrive 205 is electrically connected between the contact 236 with described cantilever tongue piece 231, being electrically connected between the contact 234 by a plurality of being electrically connected of the electrical connection contact of described magnetic head 203 and described suspension board 215 receives that (gold goal welding or tin ball bonding connect, gold ball bonding or solder ball bonding, GBB or SBB) and link together electrically mutually.Described cantilever lead 218,219 can be flexible print circuit (flexible printed circuit, FPC) and the lead that can have right quantity.With reference to figure 4a-6e, described microdrive 205 comprises framework 244 and is installed in a pair of piezoelectric element 239 on this framework 244.Described framework 244 comprises microdrive installation portion 270 (with reference to figure 4c), magnetic head installation portion 272 and a pair of linking arm 238 that described microdrive installation portion 270 and magnetic head installation portion 272 are coupled together.In one embodiment of the invention, described microdrive installation portion 270 and described linking arm 238 can be integral structure, promptly form by one-body molded mode.
Described microdrive installation portion 270 has a bottom surface, is used for described microdrive is installed to described magnetic head fold piece combination, and described piezoelectric element is installed on the surface parallel with the bottom surface of described microdrive installation portion on the linking arm.Described microdrive installation portion 270 has a bottom surface 290 (with reference to figure 4b), is used for described microdrive 205 is installed to described magnetic head fold piece combination 200.Described piezoelectric element 239 is installed on the linking arm 238 on the surface vertical with the bottom surface 290 of described microdrive installation portion 270 (not label).And the width of piezoelectric element 239 is greater than the width of described linking arm 238.Described piezoelectric element 239 can be single layer structure or sandwich construction, also can be membrane piezoelectric element, ceraminator or lead magnesio-niobate, lead titanates (PMN-PT) piezoelectric element.
In one embodiment of the invention, shown in Fig. 4 a-4b, described two linking arms 238 are parallel to each other, and the quantity of described piezoelectric element 239 is two, and is installed in respectively on described two linking arms 238.This be arrangeding in parallel can be so that two piezoelectric elements 239 that are installed on the linking arm 238 obtain more harmonious deformation direction.Optimally, described two linking arms 238 are not only parallel to each other, and all perpendicular to described magnetic head installation portion 272 and microdrive installation portion 270, thereby the Width that obtains by a larger margin is out of shape.
With respect to traditional U-shaped microdrive, because piezoelectric element of the present invention is installed on the linking arm that is positioned at framework central authorities, therefore, piezoelectric element can extend to both sides on its Width, be that piezoelectric element of the present invention can have wideer width, such as can having and the identical width of cantilever tongue piece (shown in Fig. 3 d-3e), thereby make piezoelectric element obtain by a relatively large margin distortion, finally improved the position control accuracy of magnetic head.
With reference to figure 4a-4b, in this embodiment, described magnetic head installation portion 272 is used between face that magnetic head installs and the described piezoelectric element 239 difference in height being arranged, when piezoelectric element 239 is excited, the difference in height of this increase also can make magnetic head produce displacement, add the displacement that the 238 pairs of magnetic heads of original linking arm produce, thereby it is bigger to make that 205 pairs of magnetic heads of microdrive 203 carry out the scope adjusted the position.
In addition, in this embodiment, described magnetic head installation portion 272 comprises base plate 240, the top board 242 that is connected with described linking arm 238 and connects the web joint 241 of described base plate 240 and top board 242.Magnetic head 203 (with reference to figure 6a-6b) is installed on the described top board 242, and the position of described top board 242 is higher than described piezoelectric element 239, thereby when making piezoelectric element 239 work, can be to being installed on the magnetic head 203 generation interference on the described top board 242.The bottom of described base plate 240 is equipped with stress and eliminates piece 233, when the electrical connection contact on the magnetic head 203 receive by being electrically connected and with described suspension board 215 on respective electrical connecting terminal 234 when linking together, the electrical connection zone of magnetic head 203 can produce certain stress, the end that this stress causes read-write elements is set on the magnetic head produces stress deformation, thereby reduced the reading and writing data performance of magnetic head to a certain extent, by being set, stress eliminates piece between suspension board and base plate, can weaken to a certain extent or offset this stress, thus the harmful effect that reduces or avoided stress that magnetic head is produced.
In this embodiment, described microdrive installation portion 270 comprises holding parts 237 that is connected with described linking arm 238 and the spacer portion 232 that is connected with this holding parts 237.Described spacer portion 232 is used for described microdrive 205 is fixed to the cantilever tongue piece (with reference to figure 3a) of magnetic head fold piece combination, and makes between piezoelectric element 239 and the cantilever tongue piece and form certain clearance.When 205 work of described microdrive are guaranteed in the existence in this gap, described piezoelectric element 239 not can and cantilever tongue piece between produce and interfere.In addition, a plurality of on the described piezoelectric element 239 in this embodiment near described microdrive installation portion 270 formation, be electrically connected contacts 235 such as four.Be electrically connected the contact by these, external control voltage can drive described piezoelectric element 239.Also offer notch 243 on the described piezoelectric element 239, be used to increase the oscillating quantity (stroke value) of magnetic head.Certainly, also can not offer notch on the described piezoelectric element 239, such as the piezoelectric element 239 ' shown in Fig. 5 c.
In another embodiment of the present invention, shown in Fig. 3 e, stress is eliminated piece 233 ' and spacer portion 232 also can directly be formed on the described cantilever tongue piece 231, thereby both simplified the structure of microdrive, can obtain the effect that similar stress is eliminated effect and form the gap between piezoelectric element and cantilever tongue piece simultaneously again.
Fig. 7 a-7b has showed two kinds of duties of described microdrive 205 respectively, among the figure, label 246 expressions are installed on the read-write elements of magnetic head 203 trailing edges (not label), distance h is represented the maximum deflection distance (being the maximum deflection stroke of magnetic head) of the read-write elements 246 of magnetic head 203, this distance h is big more, the displacement control ability that magnetic head is described is good more, and promptly the reading and writing data precision of magnetic head is high more.Shown in Fig. 7 a, when the voltage (figure do not show) with suitable polarity and size is applied to described piezoelectric element 239 by described electrical connection contact 235, the piezoelectric element 239 in left side shrinks, the piezoelectric element 239 on right side expands simultaneously, thereby linking arm 238 integral body that cause being connected with piezoelectric element 239 fail to agree bending, thereby make the magnetic head 203 that is connected with linking arm 238 and read-write elements 246 thereof to left movement; Fig. 7 b has showed the situation that described magnetic head 203 moves right, and this moment, the piezoelectric element in left side expanded, and the piezoelectric element contracts on right side.
On the one hand, with respect to traditional U-shaped microdrive, because piezoelectric element of the present invention is installed on the linking arm that is positioned at framework central authorities, and the width of piezoelectric element is greater than the width of described linking arm, therefore, piezoelectric element can extend to both sides on its Width, and piezoelectric element promptly of the present invention can have bigger width, thereby make piezoelectric element acquisition distortion by a relatively large margin, finally improved the position control accuracy of magnetic head.
On the other hand, because the present invention passes through to increase the width of piezoelectric element, rather than rely on the thickness that increases piezoelectric element to obtain to be out of shape by a relatively large margin, so microdrive weight can keep very little.And less weight helps to keep good weave mode frequency, resonance performance and resistance to shock.
In addition, as Fig. 4 a-6e, between the building block of microdrive 205 of the present invention, promptly has identical assembly direction between magnetic head installation portion 272, linking arm 238 and the microdrive installation portion 270.Particularly, between these parts assembly relation up and down, therefore simplified assemble flow, reduced assembly cost.
Fig. 8 a is the stereographic map of the described microdrive 305 of another embodiment of the present invention; Fig. 8 b is the stereoscopic-state figure after microdrive shown in Fig. 8 a 305 is installed magnetic head 203.This microdrive 305 and above-mentioned microdrive 205 are similar, and difference only is: in this embodiment, described piezoelectric element 239 is installed on the bottom of described linking arm 238.This piezoelectric element mounting means can obtain and above-mentioned microdrive 205 similar effects equally.
Fig. 9 a is the stereographic map of the described microdrive 405 of another embodiment of the present invention; Fig. 9 b is the stereoscopic-state figure after microdrive shown in Fig. 9 a 405 is installed magnetic head 203.This microdrive 405 and above-mentioned microdrive 205 are similar, and difference only is: described microdrive 405 also comprises the compressing tablet 438b that cooperates with described linking arm 438.Particularly, described piezoelectric element 239 is located between described linking arm 438 and the compressing tablet 438b, thereby make between the upper and lower surface of piezoelectric element 239 symmetry more, like this, when microdrive 405 work, described piezoelectric element 239 weakens in the distortion of its thickness direction, and then makes the magnetic head 203 that is installed on the microdrive 405 to move between the track of disk more reposefully, and then improves the reading and writing data performance of magnetic head.
Figure 10 a is the stereographic map of the described microdrive 505 of another embodiment of the present invention; Figure 10 b is the stereographic map of the framework 544 of microdrive shown in Figure 10 a; Figure 10 c is a kind of mounting means of microdrive shown in Figure 10 a and magnetic head 203; Figure 10 d is the another kind of mounting means of microdrive shown in Figure 10 a and magnetic head 203.This microdrive 505 is similar with microdrive 205, and distinctive points is: described microdrive 505 does not have stress and eliminates piece.When the stress in the electrical connection zone of magnetic head is very little, can consider that erection stress eliminates piece; In addition, shown in Figure 10 c-10d, magnetic head 203 can be installed on the top board 242, and the remainder of magnetic head 203 then is positioned at outside the described microdrive 505; Also can be installed on the top board 242, the remainder of magnetic head 203 is positioned within the described microdrive 505.
Figure 11 a is the stereographic map of the described microdrive 605 of another embodiment of the present invention; Figure 11 b is the stereographic map of the framework 644 of microdrive shown in Figure 11 a; Figure 11 c is the stereoscopic-state figure after microdrive shown in Figure 11 a is installed magnetic head 203.This microdrive 605 is similar with microdrive 205, and distinctive points is the structure difference of magnetic head installation portion.Among this embodiment, a magnetic head installation portion 900 comprises top board 242 and web joint 241, and does not have base plate 240.In addition, magnetic head installation portion 900 also is provided with the plural reinforcement 638 of the overall construction intensity that is used to strengthen microdrive 605.In the present invention, described reinforcement 638 also can only have one.
Figure 12 a is the stereographic map of the described microdrive 705 of another embodiment of the present invention; Figure 12 b is the stereoscopic-state figure after microdrive shown in Figure 12 a is installed magnetic head 203.In this embodiment, described piezoelectric element 739 is a sandwich construction, and is installed in the side of described linking arm 738.This side mounting means allows piezoelectric element to have enough thickness, thereby strengthens its amplitude of deformation.Similar with described microdrive 605, this microdrive 705 only has top board 242 and web joint 241, and does not have base plate 240.
Figure 13 a is the stereographic map of the described microdrive 805 of another embodiment of the present invention; Figure 13 b is the stereoscopic-state figure after microdrive shown in Figure 13 a is installed magnetic head 203.This microdrive 805 only is with the difference of above-mentioned microdrive 705: described microdrive 805 not only has top board 242 and web joint 241, but also has base plate 240.
Figure 14 a is the stereographic map of the described microdrive 905 of another embodiment of the present invention; Figure 14 b is the stereoscopic-state figure after microdrive shown in Figure 14 a is installed magnetic head 203.Compare with above-mentioned microdrive 205, the magnetic head installation portion of this microdrive 905 is the spacer block 948 that is arranged on the described piezoelectric element 239, this spacer block 948 makes and forms appropriate gap between magnetic head 203 and the piezoelectric element 239, thereby when described microdrive 905 is worked, can avoid both to interfere with each other.
Figure 15 a is the stereographic map of the described microdrive 1005 of another embodiment of the present invention; Figure 15 b is the stereoscopic-state figure after microdrive shown in Figure 15 a is installed magnetic head 203; Figure 15 c is the stereographic map of the framework 1044 of microdrive shown in Figure 15 a.Compare with above-mentioned microdrive 905, the magnetic head installation portion of this microdrive 1005 is the flat board 240 that is connected with described linking arm 238.
Figure 16 a-16d has showed a series of embodiment of the framework of microdrive of the present invention.In one embodiment, shown in Figure 16 a, described framework 350 comprises magnetic head installation portion 370, microdrive installation portion 352 and connects both a pair of linking arms 354.Described magnetic head installation portion 370 comprises top board 351, base plate 356 and connects the web joint 358 of described top board 351 and base plate 356.
Figure 16 b has showed another framework 450, and this framework 450 comprises magnetic head installation portion 470, connected a pair of linking arm 354 and microdrive installation portion 552; In this embodiment, described microdrive installation portion 552 and linking arm 354 for example connect by cementing agent or welding manner by physics mode.
Figure 16 c has showed another framework 550, compares with said frame 350, and the magnetic head installation portion 570 of this framework 550 only comprises top board 551 and the web joint 558 that is connected with this top board 551.In addition, microdrive installation portion 552 comprises holding parts 555 and the spacer portion 553 that is connected with this holding parts 555;
Figure 16 d has showed another framework 650, and this framework 650 comprises magnetic head installation portion 670, a pair of linking arm 654 and microdrive installation portion 552.Wherein, described magnetic head installation portion 670 comprises top board 651 and the web joint 658 that is connected with this top board 651, and described microdrive installation portion 552 and linking arm 654 for example connect by cementing agent or welding manner by physics mode.
Fig. 3 a-3c has showed the magnetic head fold piece combination 200 that contains microdrive of the present invention.Here, described microdrive can be above-mentioned microdrive 205,305,405,505,605,705,805,905 or 1005.As shown in the figure, this magnetic head fold piece combination 200 comprises microdrive, magnetic head and carries the cantilever part of above-mentioned microdrive and magnetic head.
The present invention provides a kind of disc drive unit that contains microdrive of the present invention simultaneously.As shown in figure 17, this disc drive unit comprises: by microdrive 205, magnetic head 203 and support the magnetic head fold piece combination 200 that microdrive 205 and the cantilever part 213 of magnetic head 203 are formed; The actuating arm 204 that is connected with described magnetic head fold piece combination 200; Disk 201; And be used to drive the Spindle Motor 202 of described disk 201.
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, equivalent combinations of carrying out according to essence of the present invention.
Claims (20)
1. microdrive that is used for magnetic head fold piece combination comprises:
At least one piezoelectric element;
Support the linking arm of described piezoelectric element;
Be located at the microdrive installation portion of an end of described linking arm; And
The magnetic head installation portion that is connected with the other end or the piezoelectric element of described linking arm, wherein
The width of described piezoelectric element is greater than the width of described linking arm, and described piezoelectric element can be excited and cause the selectivity of described linking arm to be moved.
2. microdrive according to claim 1 is characterized in that: the quantity of described linking arm is two, and two linking arms are parallel to each other and perpendicular to magnetic head installation portion and microdrive installation portion.
3. microdrive according to claim 1 is characterized in that: also offer the notch that is used to increase the magnetic head oscillating quantity on the described piezoelectric element.
4. microdrive according to claim 1 is characterized in that: described microdrive installation portion comprises holding parts that is connected with described linking arm and the spacer portion that is connected with this holding parts.
5. microdrive according to claim 1 is characterized in that: described magnetic head installation portion is used between face that magnetic head installs and the described piezoelectric element difference in height being arranged.
6. microdrive according to claim 1 is characterized in that: described magnetic head installation portion also comprises a stress elimination portion.
7. microdrive according to claim 1 is characterized in that: described microdrive also comprises at least one compressing tablet, and described piezoelectric element is located between described linking arm and the compressing tablet.
8. microdrive according to claim 1 is characterized in that: also be provided with the reinforcement that is used to strengthen microdrive intensity on the described magnetic head installation portion.
9. microdrive according to claim 1 is characterized in that: described piezoelectric element is membrane piezoelectric element, ceraminator or PMN-PT (PMN-PT) piezoelectric element.
10. microdrive according to claim 1 is characterized in that: described piezoelectric element is single layer structure or sandwich construction.
11. microdrive according to claim 1 is characterized in that: described microdrive installation portion and described linking arm are integral structure or are connected by the physical connection mode.
12. a magnetic head fold piece combination that is used for disc drive unit comprises:
Microdrive;
Magnetic head; And
Support the cantilever part of described microdrive and magnetic head, wherein
This microdrive comprises
At least one piezoelectric element;
Support the linking arm of described piezoelectric element;
Be located at the microdrive installation portion of an end of described linking arm; And
The magnetic head installation portion that is connected with the other end or the piezoelectric element of described linking arm, wherein
The width of described piezoelectric element is greater than the width of described linking arm, and described piezoelectric element can be excited and cause the selectivity of described linking arm to be moved.
13. magnetic head fold piece combination according to claim 12 is characterized in that: the quantity of described linking arm is two, and two linking arms are parallel to each other and perpendicular to magnetic head installation portion and microdrive installation portion.
14. magnetic head fold piece combination according to claim 12 is characterized in that: also offer the notch that is used to increase the magnetic head oscillating quantity on the described piezoelectric element.
15. magnetic head fold piece combination according to claim 12 is characterized in that: described microdrive installation portion comprises holding parts that is connected with described linking arm and the spacer portion that is connected with this holding parts.
16. magnetic head fold piece combination according to claim 12 is characterized in that: described magnetic head installation portion is used between face that magnetic head installs and the described piezoelectric element difference in height being arranged.
17. magnetic head fold piece combination according to claim 12 is characterized in that: described magnetic head installation portion also comprises a stress elimination portion.
18. magnetic head fold piece combination according to claim 12 is characterized in that: described microdrive also comprises at least one compressing tablet, and described piezoelectric element is located between described linking arm and the compressing tablet.
19. magnetic head fold piece combination according to claim 12 is characterized in that: also be provided with the reinforcement that is used to strengthen microdrive intensity on the described magnetic head installation portion.
20. a disc drive unit comprises:
By microdrive, magnetic head and support the magnetic head fold piece combination that the cantilever part of microdrive and magnetic head is formed;
The actuating arm that is connected with described magnetic head fold piece combination;
Disk; And
Be used to drive the Spindle Motor of described disk, wherein
This microdrive comprises
At least one piezoelectric element;
Support the linking arm of described piezoelectric element;
Be located at the microdrive installation portion of an end of described linking arm; And
The magnetic head installation portion that is connected with the other end or the piezoelectric element of described linking arm, wherein
The width of described piezoelectric element is greater than the width of described linking arm, and described piezoelectric element can be excited and cause the selectivity of described linking arm to be moved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610091511 CN101083084A (en) | 2006-05-30 | 2006-05-30 | Micro-driver and magnetic head tabs assembly and magnetic disk drive unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610091511 CN101083084A (en) | 2006-05-30 | 2006-05-30 | Micro-driver and magnetic head tabs assembly and magnetic disk drive unit |
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| Publication Number | Publication Date |
|---|---|
| CN101083084A true CN101083084A (en) | 2007-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610091511 Pending CN101083084A (en) | 2006-05-30 | 2006-05-30 | Micro-driver and magnetic head tabs assembly and magnetic disk drive unit |
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| CN (1) | CN101083084A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592610A (en) * | 2011-01-05 | 2012-07-18 | 新科实业有限公司 | Cantilever part having support block, head gimbal assembly and disk drive unit |
-
2006
- 2006-05-30 CN CN 200610091511 patent/CN101083084A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592610A (en) * | 2011-01-05 | 2012-07-18 | 新科实业有限公司 | Cantilever part having support block, head gimbal assembly and disk drive unit |
| CN102592610B (en) * | 2011-01-05 | 2016-08-03 | 新科实业有限公司 | There is a cantilever part for bracer, magnetic head fold piece combination and disc drive unit |
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