CN1516866A - Thermally conductive polymer ovrmold for disc drive actuator assembly - Google Patents
Thermally conductive polymer ovrmold for disc drive actuator assembly Download PDFInfo
- Publication number
- CN1516866A CN1516866A CNA018232396A CN01823239A CN1516866A CN 1516866 A CN1516866 A CN 1516866A CN A018232396 A CNA018232396 A CN A018232396A CN 01823239 A CN01823239 A CN 01823239A CN 1516866 A CN1516866 A CN 1516866A
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- CN
- China
- Prior art keywords
- disk drive
- over
- molded
- actuator
- base resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/1406—Reducing the influence of the temperature
- G11B33/1433—Reducing the influence of the temperature by reducing the effects of the thermal expansion
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4813—Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm
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- Moving Of Heads (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A thermally conducting and electrically insulating overmold (120) encapsulates and supports an actuator coil (118) in a disc drive actuator assembly (110). The overmold is made from a base resin mixed with a ceramic filler compound such as boron nitride, alumina, aluminum nitride, magnesium oxide, zinc oxide, silicon carbide, beryllium oxide, chromium oxide or some combination thereof. The base resin is preferably polypheneline sulfide. Glass filler and/or a coupling agent are also preferably added. The overmold reduces off track position errors in a read/write head (116) supported by the actuator assembly by reducing popping forces caused by the sudden expansion and contraction of the actuator coil during operation.
Description
Related application
The application requires the U.S. Provisional Patent Application No.60/290 to submission on May 10 calendar year 2001,093 right of priority.
Technical field
The present invention relates generally to the disk drive data storage facilities, specifically, what relate to a kind of novelty is used for over-molded of supporting actuator coil, and described actuator is used for moving one group of read/write magnetic head near corresponding a plurality of dish recording surfaces.
Background technology
The Data Holding Equipment that is referred to as the disk drive of " Winchester (Winchester) " type is well-known in industry member.These disk drives magnetically write down numerical data on the lip-deep circular shape concentric data track of one or more rigid dishes.All dishes are installed on the hub of spindle motor usually so that it can rotate.In the disk drive in the present age, the speed rotation of dish to change up to per minute 10,000.
The read/write head stack of data by one group of vertical alignment, or by the multihead of actuator control location is recorded in the disk and reads in disk.Each magnetic head generally includes electromagnetic sensor read and write element, and they are carried on the air-supported sliding part.Sliding part is to keep the relation of fluid dynamic cooperation to carry out work with the skim air that is pulled by disc spins, so that each magnetic head is so that spaced relationship is circled in the air with panel surface is closely close.In order to keep the suitable relation of circling in the air between magnetic head and dish, magnetic head is attached in and is bearing on the head gimbals or on the elastic component.
On history followed, the actuator that is used for positioning head presented many kinds of forms.The present age, most of disk drive comprised an actuator that is referred to as the rotary voice coil actuator types.Common rotary voice coil actuator comprises that one is fixed on the pivotal axis on the disk drive outer casing base plate in the outer peripheral position of adjacent discs.The installation of pivotal axis makes the rotational plane of its central axis perpendicular to dish.One actuator axle bush shell is installed on the pivotal axis by the ball journal lining assembly of a fine structure.Actuator axle bush shell supporting one is inserted in the coil in the magnetic field of permanent magnet.Permanent magnet is installed on the disk drive package header plate.
Actuator comprises that also one is positioned at the E shape piece at center.On a side of the actuator bearing shell relative with coil, the actuator arm that a plurality of vertical alignments are arranged, radially extends.Actuator arm and coil are connected on the E shape piece.Elastic component is installed on the actuator arm.When electric current is applied on the coil, the synergistic magnetic field, magnetic field of coil generation one and permanent magnet, thus around said pivot actuator bearing shell, thus, traverse the panel surface moving head.
Authorize people such as Duffy and in the U.S. Patent No. 5,262,907 of 16 promulgations November in 1993, it is transferred the possession of in assignee of the present invention, the servo-drive system of a closed loop of this patent disclosure is commonly used to keep with respect to data track the position of magnetic head.A servo-drive system like this obtains head position information from write the servo data territory in the magnetic track the disk drive manufacture process, so that in following the operator scheme process of magnetic track, the magnetic head of selecting is remained on relevant magnetic track top.
One seeks operator scheme comprises that magnetic head leaves the initial acceleration of initial magnetic track, and thereafter towards the deceleration of the magnetic head of a goal track, such searching operator scheme is also controlled by servo-drive system.This searching operation is normally controlled with speed, wherein, measure the speed of magnetic head repeatedly and compare, when magnetic head head for target magnetic track moves, put on electric current on the coil and be proportional to difference between actual speed and the distribution speed usually with velocity profile.
One trend that increases is gradually arranged in the industry, that is, provide to have the growing storage and the disk drive of transfer capability.This trend has caused will carrying out hardy to be sought the required time of operation and drops to minimum.Common searching operation comprises an initial overhead time, disk drive is carried out the operation of its inside at this moment, one hunting time, magnetic head moves and makes a decision on goal track in this hunting time, and first-class is treated the time, driver is waited at this moment, arrives magnetic head up to one of goal track specific fan-shaped section with the rotation of coiling with respect to magnetic head.
In the acceleration of seeking operation and the process in decelerating phase,, hunting time has been reduced to minimum by coil being applied the big magnitude of current.Then, when electric current increases, be that the electric energy of heat energy also increases by coil dissipation, so that the temperature of coil rises.When the temperature of coil rose, the resistance of coil increased, so the value of Control current is restricted, it influences hunting time again unfriendly.In addition, the coil temperature of raising can cause the cementing agent of employing in voice coil motor (VCM) structure and the degeneration of insulating material.
Over-molded (overmold) of actuator has been used for the disk drive of prior art, to support coil and to slow down vibration.Over-molded of one actuator is common by the liquid crystal polymer (LCP), the thermoplastics that are formed on the actuator part, or the thermosetting plastics resin is formed.Actuator body, coil and other parts are assembled, are placed on one usually and have in the mould of molding cavity, and thermoplastics is injected in the mold cavity then.
In the searching operating process of some model, a problem appears, because the heat that is produced by coil causes coil heating and thermal expansion.The heat that is produced by coil heats over-molded, make its also thermal expansion, but its coefficient of thermal expansion is different from the coefficient of thermal expansion of coil.Seek after the operation, coil and over-molded contraction are also shunk with different shrinkage factors.Because the different rates of expanding with heat and contract with cold, between coil and over-molded, form stress.These stress " bang sound " discharge suddenly, cause in the inner power that produces a burst of actuator.This power can cause magnetic head " offtrack " to move, and thus, causes data to be read and write error.
Owing to be in the glass/mineral-filled fluoropolymer resin of non-crystal state, when its temperature arrived the transition temperature of glass, its thermal expansivity manifested unexpected increase, and therefore, the stress that is caused by different expansivitys aggravates.Glass transformation temperature indicates making a start of relative motion between the polymer chain, if polymkeric substance retrains in some way, relative motion causes polymer chain to store internal potential energy.This variation of thermal expansivity is reversible, unless all polymkeric substance becomes crystal.In case over-molded material cooled, when temperature becomes when being lower than glass transformation temperature, it is available that energy stored becomes, and therefore, causes prominent quick-fried.
Therefore, need a kind of improved actuator design, it overcomes the above-mentioned of prior art and other restriction.
Summary of the invention
According to preferred embodiment,, seal and support the actuator coil of the actuator of a disk drive by over-molded of heat conduction and electric insulation.Over-molded the base resin by a hybrid ceramic filling compound made, and compound comprises: boron nitride, aluminium oxide, aluminium nitride, manganese oxide, zinc paste, silit, beryllia, Yangization Chrome, or some above-mentioned combination.In some preferred embodiment, base resin is a thermoplastics, for example, liquid crystal polymer, PEN, polyethylene terephthalate, polybutylene terephthalate, polyamide, poly-peptide amide, polyphenylene sulfide, polycarbonate, polyethers ketenes and polyphenylene oxide.In certain embodiments, over-molded material comprises a coupling agent and/or glass fibre.
Over-molded material preferably selected electric insulation but heat conduction, and has basically material with the coefficient of thermal expansion of the coefficient of thermal expansion coupling of actuator coil, the head position error that (power of the impact that is caused by expanding with heat and contract with cold of actuator coil) causes because prominent quick-fried to reduce.
By reading the following detailed description and close examination accompanying drawing, characterize and of the present inventionly above-mentioned will become clearer with other various feature and advantage.
Brief description of drawings
Fig. 1 is the planimetric map of the disk drive of constructing according to a preferred embodiment of the invention.
Fig. 2 is the stereographic map of actuator according to a preferred embodiment of the invention.
Fig. 3 estimates time of trial value of over-molded heat dissipation characteristics in the disk drive with single dish to the curve map of temperature.
Fig. 4 estimates time of trial value of over-molded heat dissipation characteristics in the disk drive with two dishes to the curve map of temperature.
Embodiment
Fig. 1 provides the plan view from above of a disk drive 100 of structure according to a preferred embodiment of the invention.One bedplate 102 and a top cover 104 (biopsy cavity marker devices demonstration) are worked in coordination and are formed the shell of the sealing of a disk drive 100.One spindle motor 106 is with a plurality of magnetic recording dishes 108 of constant high-speed rotation.
The E shape piece 110 of one actuator comprises a plurality of rigidity actuator arms 112, and extend on their adjacent discs surface.Flexible suspended rack assembly 114 extends to support one group of read/write head 116 from arm 112.Apply electric current by the actuator coil 118 to voice coil motor (VCM) 119, actuator 110 moves pivotly.By means of over-molded structure (over-molded) 120, coil 118 seals and is connected on the actuator.
Fig. 2 illustrates the stereographic map of over-molded 120 of actuator in more detail.Comprise that one is arranged on the interior lines shaft portion 122 in the coil 118 for over-molded 120, and an exterior portion 124 around the outside of coil 118.Inside and outside part 122,124 can be a separating component as shown in the figure, perhaps, can form, and like this, a part of over-molded 120 is traversed coil 118 extensions, to connect two parts 122,124.Exterior section 124 comprises limiting surface 126,128, so that contact limits block piece 130,132 (being shown among Fig. 1) in the radial extension of actuator range.
Made by over-molded material for over-molded 120, it comprises the base resin that is mixed with a ceramic packing compound.Base resin is preferably polyphenylene sulfide (PPS), liquid crystal polymer (LCP) compound, or be selected from the thermoplastic polymer compounds of following compounds cohort, comprising: PEN, polyethylene terephthalate, polybutylene terephthalate.Other the polymkeric substance that can be used as base resin comprises polyamide, poly-peptide amide, polycarbonate, polyethers ketenes and polyphenylene oxide.
In a preferred embodiment, the ceramic packing compound is a boron nitride.In another preferred embodiment, the ceramic packing compound is alumina (or aluminium oxide).Other ceramic packing compound can comprise aluminium nitride, manganese oxide, zinc paste, silit, beryllia and Yangization Chrome.The ceramic packing compound also can be by selecting the some kinds of potpourris of forming to make in the top listed ceramic packing compound.Preferably, the ceramic packing compound constitutes 25% to 90% of over-molded quality of materials.Base resin constitutes 10% to 75% of over-molded quality of materials usually.
In some preferred embodiment, glass fibre and base resin and ceramic packing compound.In other preferred embodiment, over-molded material comprises a coupling agent and/or spreading agent (being referred to as coupling agent here).Coupling agent also helps to reduce the melt viscosity of over-molded material, and improves bonding between base resin and the ceramic packing compound.Coupling agent is well known in the prior art, and it comprises the coupling agent of a new alkoxytitanium hydrochlorate and the coupling agent of a monoalkoxy titanate.Coupling agent constitutes about 0.1% to 5% of over-molded quality of materials usually.
Except structure support being provided and slowing down the actuator vibration, over-molded conducts away heat from coil 118.By round-robin airflow in the disk drive shell to this heat of flow transmission.This prevents and slows down the stress that is caused by coil and over-molded different coefficient of thermal expansion, prominent quick-fried generation, and by moving the read and write error that causes because of the quick-fried magnetic head offtrack that causes of dashing forward.
Test findings
Carry out the heat dissipation of several tests with the disk drive of definite dissimilar over-molded materials.Coil temperature is measured as the function of time, measures to continue 90 seconds.Fig. 3 illustrates the test findings for the disk drive of specific single dish, and it plots x axle 140 and is elapsed time, y axle 142 be temperature (degree centigrade).For the trial value by temperature curve 144 expressions, the base resin of polyphenylene sulfide (PPS) is filled the glass (in mass) with 20%.This is to know one type over-molded material in the prior art, and this over-molded material has the temperature conductivity of 0.3W/m-° of K.
From Fig. 3 as seen, in the composition of test, composition C and G provide significantly preferable result than the composition of prior art.
Fig. 4 illustrates the test findings of the disk drive of over-molded 2 dishes that use mentioned component.Curve 154 illustrates the result of prior art composition, and curve 158 illustrates the result of composition C, and curve 156 illustrates the result of composition G.As previously described, find that composition C provides the best result in the test.Composition C and G present than the remarkable preferable result of prior art.Other test is pointed out: the use of composition C and G reduces the error because of the prominent quick-fried offtrack that causes significantly.
Therefore, over-molded (such as 120) of heat conduction and electric insulation offer disk drive (such as 100).Over-molded is mixed a ceramic packing compound by base resin and makes.In some preferred embodiment, the ceramic packing compound is selected from following compound cohort: boron nitride, aluminium oxide, aluminium nitride, manganese oxide, zinc paste, silit, beryllia, Yangization Chrome, or some above-mentioned combination.In some preferred embodiment, base resin is the compound that is selected from following cohort, comprising: PEN, polyethylene terephthalate, polybutylene terephthalate, polyamide, poly-peptide amide, polyphenylene sulfide, polycarbonate, polyethers ketenes and polyphenylene oxide.In certain embodiments, over-molded material comprises a coupling agent.The help of the Heat Conduction Material in over-molded is eliminated prominent quick-fried because with do not have over-molded of Heat Conduction Material to compare, over-molded conducts away heat with higher rate of heat transfer from coil.
For attached claims, the understanding of term " over-molded " will be consistent with above-mentioned discussion, be used for describing a kind of structure (such as 120) of sealing and supporting an actuator coil (such as 118).Over-molded has in coil an interior lines shaft portion (such as 122), and one extends the exterior section (such as 124) of coil outside.Term " sealing " will be interpreted as at least two opposite sides that surround actuator coil contiguously, and need be in the contact on all sides of actuator coil.
For attached claims, the cited function of being carried out by " first device " will be interpreted as by above-mentioned over-molded 120 and carry out that its various embodiment according to above-mentioned base resin and ceramic packing compound composition form.Discuss as reference Fig. 3 and 4, such as the polyphenylene sulfide of prior art composition and the prior art composition of glass fibre, do not carry out cited function, and get rid of clearly outside the scope of claims, also get rid of clearly outside the equivalent definition.
It should be understood that, even in above-mentioned description, set forth many feature and advantage of various embodiment of the present invention, and together with the details of the 26S Proteasome Structure and Function of various embodiment of the present invention, but this detailed description is just in order to illustrate, on the whole scope pointed by the extensive and general implication of the expressed all claims of attached claims, in concept of the present invention, can make all kinds of variation in detail, especially about the structure and the layout of parts.For example, under the premise without departing from the spirit and scope of the present invention, the concrete application according to over-molded can change specific element.
In addition, although embodiment as herein described is over-molded at the actuator that is used for disk drive, but those skilled in the art will recognize that, under the premise without departing from the spirit and scope of the present invention, and in the equipment that over-molded also can be used for other.
Claims (10)
1. a disk drive comprises:
One rotating dish; And
One rotating actuator, it comprises that one is bearing in the W head on the adjacent disc, one actuator coil, it is applied electric current with the rotational actuator assembly, and one over-molded, its sealing and supporting actuator coil, over-molded is mixed a ceramic packing compound by a base resin and forms, its coefficient of thermal expansion that is configured to farthest reduces over-molded prominent quick-fried in be applied to the process that actuator coil heats actuator coil because of electric current.
2. disk drive as claimed in claim 1 is characterized in that, the ceramic packing compound is selected from following ceramic packing compound cohort: boron nitride, aluminium oxide, aluminium nitride, manganese oxide, zinc paste, silit, beryllia and Yangization Chrome.
3. disk drive as claimed in claim 1 is characterized in that, it is 25% to 90% that the ceramic packing compound is present in over-molded mass concentration.
4. disk drive as claimed in claim 1 is characterized in that, also comprises the glass that is blended in resin and the ceramic packing compound.
5. disk drive as claimed in claim 1 is characterized in that, base resin is a liquid crystal polymer.
6. disk drive as claimed in claim 1, it is characterized in that, base resin is to be selected from following base resin cohort, and it comprises: PEN, polyethylene terephthalate, polybutylene terephthalate, polyamide, poly-peptide amide, polyphenylene sulfide, polycarbonate, polyethers ketenes and polyphenylene oxide.
7. disk drive as claimed in claim 1 is characterized in that, it is 10% to 75% that base resin is present in over-molded the mass concentration in the material.
8. disk drive as claimed in claim 1 is characterized in that, over-molded material also comprises a coupling agent.
9. disk drive as claimed in claim 8 is characterized in that, coupling agent is selected from following coupling agent cohort, and it comprises: new alkoxytitanium hydrochlorate or monoalkoxy titanate.
10. disk drive as claimed in claim 1 is characterized in that the thermal conductivity of over-molded material is at least 0.40W/m °-K.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29009301P | 2001-05-10 | 2001-05-10 | |
| US60/290,093 | 2001-05-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1516866A true CN1516866A (en) | 2004-07-28 |
| CN1293563C CN1293563C (en) | 2007-01-03 |
Family
ID=23114505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB018232396A Expired - Fee Related CN1293563C (en) | 2001-05-10 | 2001-10-24 | Thermally conductive polymer ovrmold for disc drive actuator assembly |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2004526275A (en) |
| KR (1) | KR20040039196A (en) |
| CN (1) | CN1293563C (en) |
| DE (1) | DE10197238T5 (en) |
| GB (1) | GB2390472A (en) |
| WO (1) | WO2002093565A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057223A (en) * | 2015-04-06 | 2016-10-26 | Tdk株式会社 | Rectifying component for magnetic disk device |
| CN106898367A (en) * | 2015-12-17 | 2017-06-27 | 株式会社东芝 | Actuator and possesses the disk drive of the actuator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5184265A (en) * | 1989-11-13 | 1993-02-02 | Hewlett-Packard Company | Magnetic head suspension assembly in a disk drive |
| US5600516A (en) * | 1994-03-17 | 1997-02-04 | Seagate Technology, Inc. | Deflectable crash stop in actuator arm assembly overmold |
| US6057989A (en) * | 1997-02-26 | 2000-05-02 | Brush Wellman, Inc. | Composite disk drive armset |
| US5894382A (en) * | 1998-01-05 | 1999-04-13 | Western Digital Corporation | Head stack assembly for a disk drive having a plastic inner sleeve |
| US6061206A (en) * | 1998-04-15 | 2000-05-09 | Western Digital Corporation | Head stack assembly for a disk drive having a unitary molded plastic E-block |
-
2001
- 2001-10-24 KR KR10-2003-7014534A patent/KR20040039196A/en not_active Application Discontinuation
- 2001-10-24 GB GB0324787A patent/GB2390472A/en not_active Withdrawn
- 2001-10-24 DE DE10197238T patent/DE10197238T5/en not_active Withdrawn
- 2001-10-24 CN CNB018232396A patent/CN1293563C/en not_active Expired - Fee Related
- 2001-10-24 WO PCT/US2001/046207 patent/WO2002093565A1/en active Application Filing
- 2001-10-24 JP JP2002590354A patent/JP2004526275A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057223A (en) * | 2015-04-06 | 2016-10-26 | Tdk株式会社 | Rectifying component for magnetic disk device |
| CN106057223B (en) * | 2015-04-06 | 2018-06-26 | Tdk株式会社 | Disk set rectification part |
| CN106898367A (en) * | 2015-12-17 | 2017-06-27 | 株式会社东芝 | Actuator and possesses the disk drive of the actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0324787D0 (en) | 2003-11-26 |
| JP2004526275A (en) | 2004-08-26 |
| KR20040039196A (en) | 2004-05-10 |
| CN1293563C (en) | 2007-01-03 |
| WO2002093565A1 (en) | 2002-11-21 |
| DE10197238T5 (en) | 2004-04-22 |
| GB2390472A (en) | 2004-01-07 |
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