CN1273961C - Suspension rack for disk drive - Google Patents
Suspension rack for disk drive Download PDFInfo
- Publication number
- CN1273961C CN1273961C CN 02107697 CN02107697A CN1273961C CN 1273961 C CN1273961 C CN 1273961C CN 02107697 CN02107697 CN 02107697 CN 02107697 A CN02107697 A CN 02107697A CN 1273961 C CN1273961 C CN 1273961C
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- Prior art keywords
- suspension
- base plate
- load beam
- elastic hinge
- ceramic element
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- Supporting Of Heads In Record-Carrier Devices (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Abstract
The present invention relates to a suspension rack (10A) for a disk drive, which comprises a load beam (11), an actuator base seat (25), a hinge element (14) and a pair of piezoelectric ceramic elements (40), wherein a flexible element (15) is arranged on the load beam (11); the actuator base seat (25) comprises a bottom plate (13); the hinge element (14) is thinner than the bottom plate (13); each of the piezoelectric ceramic elements (40) is positioned in the opening part (23) of the actuator base seat (25) and is fixed on the actuator base seat (25) by a binding agent layer (80). The binding agent layer (80) comprises an electric insulating binding agent (81) and multiple fillings (82) mixed with the electric insulation binding agent (81) and formed by electric insulating materials. The fillings (82) are positioned between the piezoelectric ceramic elements (40) and the actuator base seat (25) so as to obtain an interval for electric insulation.
Description
Technical field
The present invention relates to a kind of suspension that is installed in signal conditioning package, uses such as the disc driver in the PC.
Background technology
In the disc driver with rotating disk or magneto-optic disk, a magnetic head is used in the recording surface record or the sense data of disk.Magnetic head comprises that one faces the sliding part of the recording surface of disk, is hidden in the sensor in the sliding part, or the like.When the disk high-speed rotation, sliding part rises on disk slightly, forms air cushion thus between disk and sliding part.A suspension of fixing magnetic head comprises that one is called the beam parts of load beam, form by extremely thin laminated spring, be fixed on the flex member on the load beam, be arranged on the base plate of the proximal part of load beam, or the like.The sliding part that constitutes magnetic head is installed in the end portion of flex member.
In hard disk drive (HDD) lining, the magnetic track center line of disk must be obeyed following control, promptly track width ± 10% in.Along with the recent development of compact disk, track width has been reduced to 1 μ m or littler, thereby is difficult to make sliding part to remain on the magnetic track center line.Therefore, realize that the Accurate Position Control of sliding part and the rigidity of increase disk are necessary, reduce the swing of disk thus.
Usually, traditional disc driver is single type that activates, and a suspension is only moved by voice coil motor.Single actuating is suspended in has many resonance peaks on the low-frequency band.Like this, when high frequency band, it only is difficult to be controlled at sliding part (head) on the suspension end by voice coil motor, and the bandwidth of servo-drive system can not increase.
Therefore, developed a kind of dual actuation suspension, it comprises a miniature actuation part and a voice coil motor.Miniature actuation part makes second actuator at the horizontal direction (so-called swaying direction) of the suspension end portion or the sliding part of moving load beam slightly.
Since gently more many than the moveable part of single actuating suspension on weight by the moveable part that second actuator drives, therefore can on high frequency band, control sliding part.Like this, compare with single suspension that activates, the dual actuation suspension can make high several times of the bandwidth of the servo-drive system of using for the position control of sliding part, and can correspondingly reduce seek error.
As everyone knows, piezo ceramic element, such as the lead zirconate titanate (PbZrO that is called PZT
3And PbTiO
3Solid solution) can be used to do the material of second actuator.Because PZT has quite high resonant frequency, it is suitable as second actuator of dual actuation suspension.Piezo ceramic element utilizes cementing agent to be fixed on the actuator base.
As miniature actuation part, be thinned to 10-100 micron and frangible such as the piezo ceramic element of PZT.Provide electric current to be formed at the front or the reverse side of element to the electrode of piezo ceramic element.On the other hand, the metal base plate etc. that constitutes actuator base is used as electrical grounding.Therefore, for short circuit between the electrode that prevents piezo ceramic element and the actuator base, the spacing of the electrical isolation between electrode and actuator base must guarantee.Usually, by with anchor clamps with piezo ceramic element and actuator base location and clamp and make adhesive cures, believe that this spacing can be guaranteed.
Yet, if piezo ceramic element by clamp clamps, in some cases, its may be owing to stress ruptures, because shrink slightly during adhesive cures.If piezo ceramic element is fracture in bonding process, in bonding process afterwards, stand external force when it and do the time spent and may rupture because of unrelieved stress.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of suspension of disc driver, wherein, piezo ceramic element can insulate safely and can not rupture with actuator base.
To achieve these goals, suspension of the present invention comprises a load beam, and a flex member is installed on it, and this load beam has a proximal part and one and this proximal part opposing ends part; One actuator base, it is installed on the proximal part of load beam; One piezo ceramic element, it is installed on the actuator base, and when applying voltage to it, it can be out of shape and along swaying direction moving load beam; And an adhesive layer, it is fixed on piezo ceramic element on the actuator base; Adhesive layer comprise the electrical isolation cementing agent and with this cementing agent mixed, by many stuff that electrically insulating material forms, stuff have the size that can obtain the electrical isolation spacing between piezo ceramic element and actuator base.Stuff can be by having electrical insulation capability, do not allow yielding material under compressive load, forming such as silica dioxide granule.
According to the present invention, can easily obtain to be used for the suitable spacing of electrical isolation between at the current-carrying part of piezo ceramic element, such as an electrode and actuator base.Like this, do not need to make adhesive cures, thereby can avoid stress to produce, can prevent the piezo ceramic element fracture with the clamp clamps piezo ceramic element.
In suspension of the present invention, actuator base can be formed with the opening portion that piezo ceramic element can be installed, and piezo ceramic element is installed in the opening portion.According to the present invention, because piezo ceramic element is installed in the opening portion of actuator base, so it can be protected, but and miniature actuation part attenuation.In addition, because the skew at the thickness direction center of the relative base plate in thickness direction center of piezo ceramic element is less, so moving of piezo ceramic element can be effectively in the swaying direction transmission.
In addition, in suspension of the present invention, the pro and con of piezo ceramic element is formed with the electrode (first and second electrodes) of opposed polarity respectively.In the miniature actuation part of design like this, first electrode of piezo ceramic element is by actuator base ground connection, and a lead is connected with second electrode, according to the present invention, can obtain to be used for the suitable spacing of electrical isolation between first electrode and actuator base.
In suspension of the present invention, the recommendation particle size of stuff be 10 μ m or more than, preferably 30 μ m or more than.According to the present invention, under high voltage, can obtain the excellent electric insulating energy, the voltage that imposes on the conventional piezoelectric ceramic component of not saying so.
Preferably, the Young modulus of cementing agent when solid state be 60MPa or more than.Since the Young modulus of cementing agent be 60MPa or more than, according to the present invention, the stroke of piezo ceramic element can remain on a reality and on the reasonable levels.Like this, if the stuff that will have than the Young modulus of cementing agent floor height are mixed in the cementing agent, the Young modulus of adhesive layer can be further improved.
In suspension of the present invention, actuator base can comprise that a base plate and is fixed in the elastic hinge on this base plate, and this elastic hinge also is fixed in load beam and makes base plate be connected in load beam by this elastic hinge.According to the present invention, can use the material that meets load beam, actuator base and articulated elements desired properties, like this, the performance of suspension can improve.
Other purpose of the present invention and advantage will be found out in the following description, partly will become clear from describe, and maybe can acquire from enforcement of the present invention.Objects and advantages of the present invention can be achieved and obtain by in particular the following means and combination.
Description of drawings
The accompanying drawing that is combined in the instructions and constitutes an instructions part has been introduced the present preferred embodiment of the present invention, and the detailed description of above-mentioned general description and preferred embodiment given below is combined, and is used for describing principle of the present invention.
Fig. 1 is the planimetric map according to a suspension of first embodiment of the invention;
Fig. 2 is the planimetric map of the base plate in the suspension shown in Figure 1;
Fig. 3 is the planimetric map of the articulated elements in the suspension shown in Figure 1;
Fig. 4 is the cut-open view of the miniature actuation part F4-F4 line, in the suspension in Fig. 1;
Fig. 5 is the cut-open view of amplification that shows the part of miniature actuation part shown in Figure 4;
Fig. 6 is the chart that shows the spacing between each piezo ceramic element and the articulated elements and guarantee the relation between the quantity of suspension of electrical isolation;
Fig. 7 is the chart that shows the spacing between each piezo ceramic element and the base plate and guarantee the relation between the quantity of suspension of electrical isolation;
The chart of the relation between the Young modulus of Fig. 8 cementing agent and the stroke of each piezo ceramic element; And
Fig. 9 is the cut-open view of demonstration according to the part of a suspension of second embodiment of the invention.
Embodiment
With reference now to Fig. 1 to 5, introduces according to suspension 10A first embodiment of the invention, that supply disc driver to use.
The suspension 10A of the dual actuation type shown in Fig. 1 comprises a load beam 11, miniature actuation part 12, base plate 13, articulated elements 14 or the like.
As shown in Figure 2, a circular hub bore 21 is formed at proximal part 20 places of base plate 13.Pair of holes part 23 is formed between the proximal part 20 and fore-end 22 of base plate 13.Each bore portion 23 is even as big as holding a piezo ceramic element 40.One bar shaped coupling part 24 is along the longitudinal direction (axial direction of suspension 10A) of base plate 13, extension between pair of holes part 23.Coupling part 24 can be along horizontal direction (swaying direction shown in the arrow S among Fig. 1) the do bending to a certain degree of base plate 13.
The proximal part 20 of base plate 13 is fixed on the end portion of an actuator arm, and actuator arm is driven by a voice coil motor (not shown) and rotates by this voice coil motor.Base plate 13 is to be formed by the sheet metal with (for example) about 200 μ m thickness.Under the situation of this embodiment, base plate 13 and articulated elements 14 constitute according to actuator base 25 of the present invention.
As shown in Figure 3, articulated elements 14 comprises the proximal part 30 on the overlapping proximal part 20 that is fixed on base plate 13, be formed on the bar shaped bridging part 31 on coupling part 24 correspondence positions with base plate 13, be formed on the center section 32 on fore-end 22 correspondence positions with base plate 13, a pair ofly can be fixed on the end portion 34 on the load beam 11 at the toughness hinge portion 33 of thickness direction elastic deformation.Articulated elements 14 is to be formed by the elastic metal sheet with about 50 μ m thickness.
Piezo ceramic element 40 is contained in 23 li of the opening portions of actuator base 25 respectively, thus extension parallel to each other basically.When each element 40 was installed in 23 li of corresponding opening parts, the end opposite of each element 40 and 52 and 53 respectively on vertical opposite end of each opening portion 23 was crossed gap between this end face and inside surface 60 and 61, in the face of inside surface 60 and 61.Cross gap between the side 24a of this side 54 and coupling part 24 near the side 54 of each element 40 of coupling part 24, in the face of the side 24a of coupling part 24.
As shown in Figure 4, such as the electrode 70 and 71 of the conductive material of metal by spraying or electroplate front 50 and the reverse side 51 that is formed at each piezo ceramic element 40 respectively.An electrode 70 is by silver conductive adhesive 72 and base plate 13 ground connection.Article one, lead 73 is connected with another electrode 71.And the terminals 74 of the wiring member on this lead 73 and the flex member 15 are connected.
An end 40a of each piezo ceramic element 40 utilizes adhesive layer 80 to be fixed on the proximal part 30 of articulated elements 14.The other end 40b of element 40 utilizes adhesive layer 80 to be fixed on the center section 32 of articulated elements 14.When doing like this, adhesive layer 80 also must be applied in the space between the inside surface 60 and 61 of each opening portion 23 of element 40 and actuator base 25.Like this, the distortion of piezo ceramic element 40 (moving) can more effectively send load beam 11 to, and can make element 40 end face 52 and 53 and side 54 and 55 and actuator base 25 between electrical isolation safely.
When applying voltage, one in a pair of piezo ceramic element 40 extends longitudinally, and another element 40 longitudinally shrinks.Like this, according to the direction and the stroke of piezo ceramic element 40 distortion, load beam 11 moves required distance at horizontal (swaying direction).
Illustrate to show that adhesive layer 80 comprises the cementing agent 81 as the electrical isolation matrix resin, and a large amount of grain packing things 82 as Fig. 5.These grain packing thing 82 usefulness electrically insulating materials form, and are included in 81 li of cementing agents.Though epoxy resin is an example of cementing agent 81, comprise that other plastic binder of acryl resin also can be used for this purpose.
The size that stuff 82 have can be inserted between each piezo ceramic element and the actuator base 25 it, and can guarantee the spacing of electrical isolation between the two.The particle size of stuff 82 should be 10 μ m or bigger, preferably 30 μ m or bigger.Though stuff 82 are formed by (for example) silica (silicon dioxide), also can by have electrical insulation capability, other material that under compressive load, can not easily be out of shape, for example pottery, glass, synthetic resin etc. form.
Owing to use stuff 82 for 80 li at adhesive layer, therefore can between each piezo ceramic element 40 and actuator base 25, not use any anchor clamps just can obtain predetermined spacing.Illustrate to show as Fig. 5, the electrode 71 of each ceramic component 40 and the end face 52 of spacing C1 between the articulated elements 14 and element 40 and 53 and the inside surface 60 and 61 of base plate 13 between spacing C2 be the length of 10 μ m or bigger length.
For the electrical insulation capability of the piezo ceramic element 40 of checking suspension 10A, test is carried out under 100V, 200V, 300V and 400V voltage respectively.Determine by these tests, when using the adhesive layer 80 of present embodiment, under above-mentioned any one grade of voltage, all can obtain electrical isolation.
On the other hand, do not using any anchor clamps, using the cementing agent do not comprise stuff 82 that each piezo ceramic element 40 is fixed on to carry out identical electrical isolation with above-mentioned voltage under the situation of actuator base 25 and test.At this moment, some sample lacks the spacing for insulation usefulness, at 100V or will failure of insulation below the 100V.
The inventor has manufactured experimently a large amount of suspensions, and wherein, the cementing agent that the piezo ceramic element utilization has stuff is fixed on the actuator base.The inventor has checked the relation between the quantity and spacing C1 (spacing between each piezo ceramic element 40 and the articulated elements 14) of the suspension of the electrical isolation of guaranteeing given degree.Fig. 6 has shown check result.
Fig. 7 has shown under the cementing agent that use has stuff is fixed on each ceramic component 40 situation on the actuator base, the check result of the relation between suspension quantity and each the spacing C2 (spacing between each piezo ceramic element 40 and the base plate 13).These Insulation test show, if spacing C1 and C2 greater than 10 μ m, can guarantee the electrical isolation of given degree.In other words, if 10 μ m or bigger stuff are mixed in 81 li of cementing agents, can obtain given insulation degree.
In the foregoing description, piezo ceramic element 40 is fixed on the actuator base 25 by the adhesive layer 80 that is applied with 10 μ m or bigger stuff.Owing to use this adhesive layer 80, needn't use any anchor clamps just can obtain suitable spacing (about 10 μ m to 50 μ m).According to this embodiment, can avoid after adhesive cures, producing stress, and this can produce at piezo ceramic element during by clamp clamps.
The inventor has made five samples according to the foregoing description, and has checked the load that makes piezo ceramic element 40 fractures after adhesive cures.On the other hand, the inventor has prepared five samples of doing contrast, wherein, piezo ceramic element cementing agent (not having stuff) when being cured by clamp clamps, and check the load that makes the ceramic component fracture.
These destructive tests show, rupture when standing the load of 140g, 160g, 130g, 180g and 130g respectively based on the sample 1 to 5 of the foregoing description, and like this, their average load is 148g.On the other hand, contrast sample 1 to 5 is ruptured when standing the load of 90g, 70g, 80g, 40g and 80g respectively, and like this, their average load is reduced to 72g.
Fig. 8 has shown the relation between the stroke of the Young modulus of cementing agent and piezo ceramic element 40.In Fig. 8, L1 and L2 represent assay value and measured value respectively.Can see that from Fig. 8 the Young modulus of cementing agent is high more, the stroke of obtainable ceramic component is favourable more.Particularly, the cementing agent that has 60MPa or a higher Young modulus by use can obtain to be suitable for the stroke of actual use.
Fig. 9 has shown the suspension 10B according to second embodiment of the invention.In this suspension 10B, pair of electrodes 91 and 92 is formed at the reverse side 51 of each piezo ceramic element 40, and first electrode 92 is by silver conductive adhesive 72 and articulated elements 14 ground connection.One lead 73 that is connected with second electrode 92 is connected with terminals 74 on the flex member 15.Second embodiment has other 26S Proteasome Structure and Function of the suspension 10A among first embodiment.Therefore, identical label is used to represent two same sections among the embodiment, and being presented in here of these parts is omitted.In the suspension 10B of this embodiment, also be by between the electrode 92 of piezo ceramic element 40 and articulated elements 14, providing adhesive layer 80 to obtain with stuff as the spacing of insulation.
In the various embodiments described above, piezo ceramic element 40 is installed in 23 li of the opening portions of actuator base 25 respectively.Yet, element 40 not being installed in 23 li of opening portions, element 40 also can overlap mode on the base plate 13, utilize adhesive layer 80 to be fixed on the base plate 13, shown in the double dot dash line F among Fig. 9.
Will be appreciated that, comprise among the present invention of the foregoing description in enforcement, under the situation that does not exceed the scope of the invention or spirit, constitute of the present invention, comprise that the part of load beam, actuator base, base plate, cementing agent, stuff, piezo ceramic element etc. can carry out various changes or improvement.For weight reduction, base plate and load beam can be used such as the light metal alloy of aluminium alloy or light metal alloy and stainless thin slice (for example coating) formation.
For those skilled in the art, other advantage and improvement are to find easily.Therefore, in a broad sense, the invention is not restricted to shown and embodiment described detail and demonstration here.Under the situation of the spirit or scope that do not exceed the total inventive concept that limits by appended claims and their equivalent, can also make many improvement.
Claims (13)
1. the suspension of a disc driver is characterized in that, it comprises:
One load beam (11) is installed a flex member (15) on it, this load beam has a proximal part and one and this proximal part opposing ends part;
One actuator base (25), it is installed on the proximal part of load beam (11);
One piezo ceramic element (40), it is installed on the actuator base (25), and when applying voltage to it, it can be out of shape and moving load beam (11); And
One adhesive layer (80), it is fixed on piezo ceramic element (40) on the actuator base (25),
Adhesive layer (80) comprise electrical isolation cementing agent (81) and with this cementing agent (81) mixed, by many stuff (82) that electrically insulating material forms, stuff (82) have the size that can obtain the electrical isolation spacing between piezo ceramic element (40) and actuator base (25).
2. the suspension of disc driver as claimed in claim 1 is characterized in that, described actuator base (25) is formed with the opening portion (23) that piezo ceramic element (40) can be installed, and piezo ceramic element (40) is installed in the opening portion (23).
3. the suspension of disc driver as claimed in claim 2 is characterized in that, the pro and con of described piezo ceramic element (40) is formed with the electrode (70,71) of opposed polarity respectively.
4. the suspension of disc driver as claimed in claim 2 is characterized in that, the particle size of described stuff (82) be 10 μ m or more than.
5. the suspension of disc driver as claimed in claim 1 is characterized in that, the Young modulus of described cementing agent (81) when solid state be 60MPa or more than.
6. the suspension of disc driver as claimed in claim 2 is characterized in that, the Young modulus of described cementing agent (81) when solid state be 60MPa or more than.
7. the suspension of disc driver as claimed in claim 3 is characterized in that, the Young modulus of described cementing agent (81) when solid state be 60MPa or more than.
8. the suspension of disc driver as claimed in claim 4 is characterized in that, the Young modulus of described cementing agent (81) when solid state be 60MPa or more than.
9. the suspension of disc driver as claimed in claim 1, it is characterized in that, described actuator base (25) comprises that a base plate (13) and is fixed in the elastic hinge (14) on this base plate, and this elastic hinge (14) also is fixed in load beam (11) and makes base plate (13) be connected in load beam (11) by this elastic hinge (14).
10. the suspension of disc driver as claimed in claim 2, it is characterized in that, described actuator base (25) comprises that a base plate (13) and is fixed in the elastic hinge (14) on this base plate, and this elastic hinge (14) also is fixed in load beam (11) and makes base plate (13) be connected in load beam (11) by this elastic hinge (14).
11. the suspension of disc driver as claimed in claim 3, it is characterized in that, described actuator base (25) comprises that a base plate (13) and is fixed in the elastic hinge (14) on this base plate, and this elastic hinge (14) also is fixed in load beam (11) and makes base plate (13) be connected in load beam (11) by this elastic hinge (14).
12. the suspension of disc driver as claimed in claim 4, it is characterized in that, described actuator base (25) comprises that a base plate (13) and is fixed in the elastic hinge (14) on this base plate, and this elastic hinge (14) also is fixed in load beam (11) and makes base plate (13) be connected in load beam (11) by this elastic hinge (14).
13. the suspension of disc driver as claimed in claim 5, it is characterized in that, described actuator base (25) comprises that a base plate (13) and is fixed in the elastic hinge (14) on this base plate, and this elastic hinge (14) also is fixed in load beam (11) and makes base plate (13) be connected in load beam (11) by this elastic hinge (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02107697 CN1273961C (en) | 2002-03-29 | 2002-03-29 | Suspension rack for disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02107697 CN1273961C (en) | 2002-03-29 | 2002-03-29 | Suspension rack for disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448919A CN1448919A (en) | 2003-10-15 |
| CN1273961C true CN1273961C (en) | 2006-09-06 |
Family
ID=28680209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02107697 Expired - Lifetime CN1273961C (en) | 2002-03-29 | 2002-03-29 | Suspension rack for disk drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1273961C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5189813B2 (en) * | 2007-09-27 | 2013-04-24 | 日本発條株式会社 | Head suspension and piezoelectric actuator |
| CN101714359B (en) * | 2008-10-03 | 2012-05-02 | 日本发条株式会社 | Head suspension and method of manufacturing head suspension |
| JP4948554B2 (en) * | 2009-02-16 | 2012-06-06 | 日本発條株式会社 | Head suspension |
| JP5500872B2 (en) * | 2009-05-29 | 2014-05-21 | 日本発條株式会社 | Piezoelectric element with electrode and head suspension |
| US8542465B2 (en) * | 2010-03-17 | 2013-09-24 | Western Digital Technologies, Inc. | Suspension assembly having a microactuator electrically connected to a gold coating on a stainless steel surface |
| US8339748B2 (en) * | 2010-06-29 | 2012-12-25 | Western Digital Technologies, Inc. | Suspension assembly having a microactuator bonded to a flexure |
| US8665567B2 (en) * | 2010-06-30 | 2014-03-04 | Western Digital Technologies, Inc. | Suspension assembly having a microactuator grounded to a flexure |
| CN109427352B (en) * | 2017-08-25 | 2020-05-05 | 日本发条株式会社 | Electronic machine manufacturing apparatus |
| JP7516191B2 (en) * | 2020-09-29 | 2024-07-16 | 日本発條株式会社 | Manufacturing method and manufacturing device for disk drive suspension |
-
2002
- 2002-03-29 CN CN 02107697 patent/CN1273961C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1448919A (en) | 2003-10-15 |
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Granted publication date: 20060906 |