US20160071534A1 - Actuator Comb Having A Stepped Inner Bore - Google Patents
Actuator Comb Having A Stepped Inner Bore Download PDFInfo
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- US20160071534A1 US20160071534A1 US14/481,584 US201414481584A US2016071534A1 US 20160071534 A1 US20160071534 A1 US 20160071534A1 US 201414481584 A US201414481584 A US 201414481584A US 2016071534 A1 US2016071534 A1 US 2016071534A1
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- inner bore
- actuator
- actuator comb
- comb
- pivot
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- 238000003825 pressing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- G11B5/4826—Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive
Abstract
Description
- Embodiments of the invention may relate generally to hard disk drives and more particularly to an actuator comb with a stepped bore for seating a tolerance ring.
- A hard-disk drive (HDD) is a non-volatile storage device that is housed in a protective enclosure and stores digitally encoded data on one or more circular disks having magnetic surfaces. When an HDD is in operation, each magnetic-recording disk is rapidly rotated by a spindle system. Data is read from and written to a magnetic-recording disk using a read/write head that is positioned over a specific location of a disk by an actuator. A read/write head uses a magnetic field to read data from and write data to the surface of a magnetic-recording disk. Write heads make use of the electricity flowing through a coil, which produces a magnetic field. Electrical pulses are sent to the write head, with different patterns of positive and negative currents. The current in the coil of the write head induces a magnetic field across the gap between the head and the magnetic disk, which in turn magnetizes a small area on the recording medium.
- Actuator assemblies used to move the read/write head typically include, among other components, an actuator comb having one or more actuator arms and a pivot-bearing (or “cartridge bearing” or “bearing cartridge”) positioned around a pivot-shaft all within the central bore of the actuator comb. A continuing challenge lies with attaching the actuator comb to the pivot-bearing.
- One approach may be to use an adhesive such as glue to adhere the comb to the bearing cartridge, however, when curing in an oven the mismatch between materials may cause torque shifts in the assembly. Further, use of adhesives makes it much more difficult to repair and rework the actuator assembly, as well as uses valuable assembly time and oven space.
- Another approach may be to use a tolerance ring inside the bore of the actuator comb, thereby providing an interference fit between the comb and the bearing cartridge. However, the acts of fitting the tolerance ring within the comb bore and fitting the bearing cartridge within the tolerance ring-comb assembly may generate undesirable debris particles when forcibly pressing into the comb.
- Any approaches described in this section are approaches that could be pursued, but not necessarily approaches that have been previously conceived or pursued. Therefore, unless otherwise indicated, it should not be assumed that any of the approaches described in this section qualify as prior art merely by virtue of their inclusion in this section.
- Embodiments of the invention are directed toward a head stack assembly (HSA) having an actuator comb with a stepped inner bore, a hard disk drive (HDD) including such an assembly, and a method of manufacturing an associated assembly. The step feature of the stepped inner bore may be such that an upper portion of the inner bore above the step feature has a first diameter that is greater than the diameter of a lower portion of the inner bore below the step feature. Therefore, little resistance and friction is encountered when force fitting a pivot-bearing assembly into the stepped inner bore, until the pivot-bearing reaches the lower portion of the stepped inner bore below the step feature, thereby limiting surface damage and the generation of unwanted debris particles by scraping one metal against another.
- According to an embodiment, the HSA may further comprise a tolerance ring disposed within and seated on the step feature of the inner bore, to couple the actuator comb with the pivot-bearing assembly. According to an embodiment and in a context in which the actuator comb includes a plurality of actuator arms, the HSA may include a plurality of tolerance rings, such as one positioned below the step feature and one positioned above and seated on the step feature of the comb inner bore.
- Embodiments discussed in the Summary of Embodiments section are not meant to suggest, describe, or teach all the embodiments discussed herein. Thus, embodiments of the invention may contain additional or different features than those discussed in this section. Furthermore, no limitation, element, property, feature, advantage, attribute, or the like expressed in this section, which is not expressly recited in a claim, limits the scope of any claim in any way.
- Embodiments are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which:
-
FIG. 1 is a plan view illustrating a hard disk drive, according to an embodiment; -
FIG. 2 is a partial cross-sectional side view illustrating a head stack assembly (HSA), according to an embodiment; -
FIG. 3 is a magnified cross-sectional side view illustrating a step feature of an actuator comb inner bore and a corresponding pivot-bearing of an HSA, according to an embodiment; -
FIG. 4 is an exploded view illustrating an HSA, according to an embodiment; -
FIG. 5 is a flowchart illustrating a method for manufacturing an HSA, according to an embodiment; and -
FIG. 6 is a magnified cross-sectional side view illustrating a notch feature of an actuator comb inner bore of an HSA, according to an embodiment. - Approaches to a head stack assembly (HSA) having an actuator comb with a stepped inner bore are described. In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention described herein. It will be apparent, however, that the embodiments of the invention described herein may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the embodiments of the invention described herein.
- Embodiments may be used in the context of an actuator assembly in a hard-disk drive (HDD) data storage device. Thus, in accordance with an embodiment, a plan view illustrating an
HDD 100 is shown inFIG. 1 to illustrate an exemplary operating environment. -
FIG. 1 illustrates the functional arrangement of components of theHDD 100 including aslider 110 b that includes a magnetic-reading/recording head 110 a. Collectively,slider 110 b andhead 110 a may be referred to as a head slider. TheHDD 100 includes at least one head gimbal assembly (HGA) 110 including the head slider, alead suspension 110 c attached to the head slider typically via a flexure, and aload beam 110 d attached to thelead suspension 110 c. The HDD 100 also includes at least one magnetic-recording medium 120 rotatably mounted on aspindle 124 and a drive motor (not visible) attached to thespindle 124 for rotating themedium 120. Thehead 110 a includes a write element and a read element for respectively writing and reading information stored on themedium 120 of theHDD 100. Themedium 120 or a plurality of disk media may be affixed to thespindle 124 with adisk clamp 128. - The HDD 100 further includes an
arm 132 attached to the HGA 110, acarriage 134, a voice-coil motor (VCM) that includes anarmature 136 including avoice coil 140 attached to thecarriage 134 and astator 144 including a voice-coil magnet (not visible). Thearmature 136 of the VCM is attached to thecarriage 134 and is configured to move thearm 132 and the HGA 110, to access portions of themedium 120, being mounted on a pivot-shaft 148 with an interposed pivot-bearingassembly 152. In the case of an HDD having multiple disks, thecarriage 134 is called an “E-block,” or comb, because the carriage is arranged to carry a ganged array of arms that gives it the appearance of a comb. - An assembly comprising a head gimbal assembly (e.g., HGA 110) including a flexure to which the head slider is coupled, an actuator arm (e.g., arm 132) and/or load beam to which the flexure is coupled, and an actuator (e.g., the VCM) to which the actuator arm is coupled, may be collectively referred to as a head stack assembly (HSA). An HSA may, however, include more or fewer components than those described. For example, an HSA may refer to an assembly that further includes electrical interconnection components. Generally, an HSA is the assembly configured to move the head slider to access portions of the
medium 120 for read and write operations. - With further reference to
FIG. 1 , electrical signals (e.g., current to thevoice coil 140 of the VCM) comprising a write signal to and a read signal from thehead 110 a, are provided by a flexible interconnect cable 156 (“flex cable”). Interconnection between theflex cable 156 and thehead 110 a may be provided by an arm-electronics (AE)module 160, which may have an on-board pre-amplifier for the read signal, as well as other read-channel and write-channel electronic components. The AE 160 may be attached to thecarriage 134 as shown. Theflex cable 156 is coupled to an electrical-connector block 164, which provides electrical communication through electrical feedthroughs provided by anHDD housing 168. TheHDD housing 168, also referred to as a base, in conjunction with an HDD cover provides a sealed, protective enclosure for the information storage components of theHDD 100. - Other electronic components, including a disk controller and servo electronics including a digital-signal processor (DSP), provide electrical signals to the drive motor, the
voice coil 140 of the VCM and thehead 110 a of the HGA 110. The electrical signal provided to the drive motor enables the drive motor to spin providing a torque to thespindle 124 which is in turn transmitted to themedium 120 that is affixed to thespindle 124. As a result, the medium 120 spins in adirection 172. The spinningmedium 120 creates a cushion of air that acts as an air-bearing on which the air-bearing surface (ABS) of theslider 110 b rides so that theslider 110 b flies above the surface of themedium 120 without making contact with a thin magnetic-recording layer in which information is recorded. - The electrical signal provided to the
voice coil 140 of the VCM enables thehead 110 a of theHGA 110 to access atrack 176 on which information is recorded. Thus, thearmature 136 of the VCM swings through anarc 180, which enables thehead 110 a of theHGA 110 to access various tracks on the medium 120. Information is stored on the medium 120 in a plurality of radially nested tracks arranged in sectors on the medium 120, such assector 184. Correspondingly, each track is composed of a plurality of sectored track portions (or “track sector”), for example,sectored track portion 188. Eachsectored track portion 188 may be composed of recorded data and a header containing a servo-burst-signal pattern, for example, an ABCD-servo-burst-signal pattern, which is information that identifies thetrack 176, and error correction code information. In accessing thetrack 176, the read element of thehead 110 a of theHGA 110 reads the servo-burst-signal pattern which provides a position-error-signal (PES) to the servo electronics, which controls the electrical signal provided to thevoice coil 140 of the VCM, enabling thehead 110 a to follow thetrack 176. Upon finding thetrack 176 and identifying a particularsectored track portion 188, thehead 110 a either reads data from thetrack 176 or writes data to thetrack 176 depending on instructions received by the disk controller from an external agent, for example, a microprocessor of a computer system. - References herein to a hard disk drive, such as
HDD 100 illustrated and described in reference toFIG. 1 , may encompass a data storage device that is at times referred to as a “hybrid drive”. A hybrid drive refers generally to a storage device having functionality of both a traditional HDD (see, e.g., HDD 100) combined with solid-state storage device (SSD) using non-volatile memory, such as flash or other solid-state (e.g., integrated circuits) memory, which is electrically erasable and programmable. As operation, management and control of the different types of storage media typically differs, the solid-state portion of a hybrid drive may include its own corresponding controller functionality, which may be integrated into a single controller along with the HDD functionality. A hybrid drive may be architected and configured to operate and to utilize the solid-state portion in a number of ways, such as, for non-limiting examples, by using the solid-state memory as cache memory, for storing frequently-accessed data, for storing I/O intensive data, and the like. Further, a hybrid drive may be architected and configured essentially as two storage devices in a single enclosure, i.e., a traditional HDD and an SSD, with either one or multiple interfaces for host connection. - As discussed, one approach to coupling an actuator comb to a pivot-shaft via a pivot-bearing may involve the use of a tolerance ring inside the bore of the actuator comb, thereby providing an interference fit between the comb and the bearing cartridge. However, the acts of fitting the tolerance ring within the comb bore and fitting the bearing cartridge within the tolerance ring-comb assembly may generate undesirable debris particles when forcibly pressing into the comb.
- Furthermore, in the context of HDDs having a relatively large number of disks and thus a relatively large number of actuator arms coupled with the actuator comb, this challenge associated with attaching the actuator comb to the pivot assembly may be exacerbated because of the correspondingly large (height, or Z-direction) actuator assembly. Use of a single tolerance ring in this context of a tall actuator comb is not necessarily a preferred solution because of the high cost associated with a tolerance ring of such stature, essentially because such a tolerance ring is not a commonly fabricated part and therefore does not enjoy the economies of scale and mass production, and could require special tooling.
-
FIG. 2 is a partial cross-sectional side view illustrating a head stack assembly (HSA), according to an embodiment.HSA 200 includes anactuator comb 202 having one ormore actuator arm 204 a-204 n, collectively referred to as actuator arm(s) 204, and acoil 206 which is part of a voice coil motor when paired with a set of magnets within an HDD such as HDD 100 (FIG. 1 ).Actuator comb 202 has aninner bore 203 which, according to an embodiment, has astep feature 205. Within the steppedinner bore 203 is seated at least onetolerance ring 208, according to an embodiment, which facilitates an interference fit for a pivot-bearing 210 (also referred to as a “bearing cartridge”). According to an embodiment, the outer surface of the pivot-bearing 210 has astep feature 211 which generally corresponds to, but need not be identical to, thestep feature 205 ofinner bore 203. The pivot-bearing 210 is interposed between a pivot-shaft 212, which is typically affixed to an HDD base (see, e.g.,housing 168 ofFIG. 1 ), and theactuator comb 202. As such, pivot-bearing 210 is inset withininner bore 203 and thereby coupled withactuator comb 202 by way of the at least onetolerance ring 208. - An
actuator comb 202 having a steppedinner bore 203 having astep feature 205 therefore comprises an upper portion of theinner bore 203 which has a first diameter and a lower portion ofinner bore 203 which has a second diameter that is less than the first diameter, according to an embodiment. Stated otherwise, the diameter of theinner bore 203 is larger at the upper portion than the diameter at the lower portion. Thus, with a stepped inner bore such asinner bore 203 ofactuator comb 202, when assembling theactuator comb 202 with the pivot assembly (e.g., pivot-shaft 212 and pivot-bearing 210) from the top of theactuator comb 202 down into thecomb 202, thetolerance ring 208 may be placed inside of theactuator comb 202 and then the pivot-bearing 210 forcibly fit inside of thetolerance ring 208. Notably, because of thestep feature 205 of steppedinner bore 203 there is very limited friction or resistance between the pivot-bearing 210 and the inner bore 203-tolerance ring 208 assembly, until the pivot-bearing 210 reaches the lower portion of the steppedinner bore 203 ofactuator 202, below thestep feature 205. Consequently, the likelihood that debris particles are generated during this assembly process, such as due to metals being scraped against one another, may be diminished (e.g., perhaps by approximately ½ for a single-step inner bore). Similarly, if a manufacturing process warrants assembling an actuator comb with a pivot assembly from the bottom of the actuator comb up into the comb, then the step feature could be reversed, whereby the diameter of the inner bore is larger at the lower portion than the diameter at the upper portion. - According to an embodiment, one or more tolerance ring such as
tolerance ring 203 is disposed within the steppedinner bore 203 of theactuator comb 202, to couple theactuator comb 202 with the pivot-bearing 210 which is interposed between the pivot-shaft 212 and theactuator comb 202.FIG. 3 is a magnified cross-sectional side view illustrating a step feature of an actuator comb inner bore and a corresponding pivot-bearing of an HSA, according to an embodiment. For example,FIG. 3 depicts a magnified view of area A-A ofFIG. 2 , illustrating the actuator comb 202-pivot-bearing 210 assembly interface. -
FIG. 3 depicts an example of thestep feature 205 of theinner bore 203 ofactuator comb 202, with, according to an embodiment, atolerance ring 208 seated thereon, and a corresponding but not necessarilyidentical step feature 211 of pivot-bearing 210. - According to an embodiment, a multiple-arm HSA, such as HSA 200 (
FIG. 2 ) havingactuator arms 204 a-204 n, comprises a plurality of tolerance rings disposed with theinner bore 203 of theactuator comb 202 to couple theactuator comb 202 with the pivot-bearing 210 which is interposed between the pivot-shaft 212 and theactuator comb 202. For example,HSA 200 may include two tolerance rings 208. -
FIG. 4 is an exploded view illustrating an HSA, according to an embodiment. According to an embodiment, afirst tolerance ring 208 a is positioned below the step feature 205 (see, e.g.,step feature 205 ofFIGS. 2-3 ) of the steppedinner bore 203 of theactuator comb 202, and asecond tolerance ring 208 b is positioned above thestep feature 205 of theinner bore 203. Thus, thelower tolerance ring 208 a mates with the portion of the pivot-bearing 210 below thestep feature 205 and theupper tolerance ring 208 b mates with the portion of the pivot-bearing 210 above thestep feature 205. For an implementation example and according to an embodiment, thestep feature 205 of steppedinner bore 203 may be positioned at about the middle of theinner bore 203 in the axial (Z-) direction. Thus, two of the same tolerance rings could be used to couple theactuator comb 202 with the pivot-bearing 210, thereby providing a suitable fit as well as avoiding cost by minimizing unique parts. - Further, use of multiple tolerance rings should not only ensure a better fit between the bearing cartridge and the actuator comb than would use of only a single tolerance ring, but also provide a potential cost avoidance of the significant cost associated with fabricating an unusually large (along the axial direction) tolerance ring. Such a multiple tolerance ring configuration is especially useful, although not limited to, an HSA having ten or more actuator arms, such as
actuator arms 204 a-204 n of HSA 200 (FIG. 2 ). - While the foregoing embodiments have been described in the context of an
actuator comb 202 having a steppedinner bore 203 having asingle step feature 205 whereby an upper portion of theinner bore 203 has a first diameter and a lower portion ofinner bore 203 has a second diameter that is less than the first diameter, additionally, multi-step embodiments are specifically contemplated. For example, an actuator comb inner bore could be configured with more than one step feature, whereby the diameter of the inner bore decreases in steps from the upper portion of the actuator comb to the lower portion of the actuator comb, and where the outer surface of the corresponding pivot-bearing has multiple step features which generally correspond to the step features of the inner bore and where the respective diameter of each of multiple tolerance rings is configured accordingly. -
FIG. 5 is a flowchart illustrating a method for manufacturing an HSA, according to an embodiment. Reference is also made to the exploded view ofFIG. 4 for exemplary purposes in the context of this method of manufacturing. - At
block 502, a tolerance ring is inserted into an actuator comb inner bore having a step feature. For example,tolerance ring 208 a and/ortolerance ring 208 b is inserted intoinner bore 203 ofactuator comb 202. If a single tolerance ring is used, then the tolerance ring may span the entire axial length ofinner bore 203 or a single shorter tolerance ring (e.g.,tolerance ring inner bore 203 that is above the step feature 205 (FIGS. 2-3 ) or below thestep feature 205 or may span a portion ofinner bore 203 that includes thestep feature 205, for example. If multiple tolerance rings are used, then one of the tolerance rings (e.g.,tolerance ring 208 b) may span the portion ofinner bore 203 that is above the step feature 205 (FIGS. 2-3 ) and the other of the tolerance rings (e.g.,tolerance ring 208 a) may span the portion ofinner bore 203 that is below thestep feature 205, for example. Therefore,tolerance ring 208 a would mate with the portion ofinner bore 203 below thestep feature 205 and with the portion of pivot-bearing 210 below the corresponding step feature 211 (e.g., the smaller diameter portions of theinner bore 203 and pivot-bearing 210), andtolerance ring 208 b would mate with the portion ofinner bore 203 above thestep feature 205 and with the portion of pivot-bearing 210 above the corresponding step feature 211 (e.g., the larger diameter portions of theinner bore 203 and pivot-bearing 210). - At
block 504, a pivot bearing assembly is interference fit inside of the tolerance ring and actuator comb, whereby the resistance above the step feature is less than the resistance below the step feature. For example, pivot-bearing 210 is press fit inside of the tolerance rings 208 a, 208 b, which are inset into theinner bore 203 ofactuator comb 202 pursuant to block 502, and because of the differing diameters of theinner bore 203 the friction and the resistance offered by theupper tolerance ring 208 b and/or upper portion of the inner bore 203 (larger diameter portion) is minimized until the pivot-bearing 210 is pushed beyond thestep feature 205 into thelower tolerance ring 208 a inset in the lower portion of inner bore 203 (smaller diameter portion). That is, the resistance offered by theupper tolerance ring 208 b and/or upper portion of theinner bore 203 is less than the resistance offered by thelower tolerance ring 208 a and/or the lower portion ofinner bore 203. Because of the lesser degree of friction and thus resistance, debris particle generation is less likely than if a non-stepped (constant diameter) actuator comb inner bore was used. - Alternatively, the pivot bearing assembly could be interference fit into the one or more tolerance ring and then this pivot bearing-tolerance ring assembly interference fit into the actuator comb inner bore. However, because of the radial load applied to the tolerance ring(s) from the inserted pivot-bearing, and the presence of this radial load when inserting the bearing-ring assembly into the actuator comb, the likelihood of debris particle generation may be higher than with the method described in reference to
FIG. 5 . - A variation of the method described in reference to
FIG. 5 may include seating the tolerance ring onto the step feature of the inner bore. For example, tolerance ring 208 (FIG. 3 ), orupper tolerance ring 208 b (FIG. 4 ), is seated onto the step feature 205 (FIG. 3 ) ofinner bore 203 ofactuator comb 202. -
FIG. 6 is a magnified cross-sectional side view illustrating a notch feature of an actuator comb inner bore of an HSA, according to an embodiment. For example,FIG. 6 depicts a magnified view of an area similar to area A-A ofFIG. 2 , though illustrating an actuator comb 602-pivot-bearing 610 assembly interface. Rather than an actuator comb inner bore having different diameters, such asinner bore 203 ofactuator comb 202 ofFIG. 2 ,FIG. 6 depicts an example of anotch feature 605 of aninner bore 603 of anactuator comb 602, whereby thenotch feature 605 provides a seat for atolerance ring 208 seated thereon, and an associated pivot-bearing 610. The precise shape of thenotch feature 605 may vary from implementation to implementation. Therefore, the square-shapednotch feature 605 depicted inFIG. 6 is just one exemplary shape. For non-limiting examples, the non-seating surface(s) of thenotch feature 605 may be rounded or angled, and the like, as long as the lower seating surface is capable of providing a suitable seating fortolerance ring 208. - According to an embodiment, an HSA comprises a plurality of tolerance rings disposed within the
inner bore 603 of theactuator comb 602 to couple theactuator comb 602 with the pivot-bearing 610 which is interposed between a pivot-shaft such as pivot-shaft 212 (FIG. 2 ) and theactuator comb 602. For example, the HSA may include two tolerance rings, such astolerance ring 208 a andtolerance ring 208 b ofFIG. 4 , one positioned above and seated onnotch feature 605 and one positioned belownotch feature 605. - In the foregoing description, embodiments of the invention have been described with reference to numerous specific details that may vary from implementation to implementation. Therefore, various modifications and changes may be made thereto without departing from the broader spirit and scope of the embodiments. Thus, the sole and exclusive indicator of what is the invention, and is intended by the applicants to be the invention, is the set of claims that issue from this application, in the specific form in which such claims issue, including any subsequent correction. Any definitions expressly set forth herein for terms contained in such claims shall govern the meaning of such terms as used in the claims. Hence, no limitation, element, property, feature, advantage or attribute that is not expressly recited in a claim should limit the scope of such claim in any way. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
- In addition, in this description certain process steps may be set forth in a particular order, and alphabetic and alphanumeric labels may be used to identify certain steps. Unless specifically stated in the description, embodiments are not necessarily limited to any particular order of carrying out such steps. In particular, the labels are used merely for convenient identification of steps, and are not intended to specify or require a particular order of carrying out such steps.
Claims (29)
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US14/481,584 US9293162B1 (en) | 2014-09-09 | 2014-09-09 | Actuator comb having a stepped inner bore |
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US14/481,584 US9293162B1 (en) | 2014-09-09 | 2014-09-09 | Actuator comb having a stepped inner bore |
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US5315465A (en) * | 1991-07-12 | 1994-05-24 | Seagate Technology, Inc. | Compliant pivot mechanism for a rotary actuator |
US6018441A (en) * | 1998-06-08 | 2000-01-25 | Read-Rite Corporation | Disk drive pivot bearing and actuator arm assembly |
US6288879B1 (en) | 1998-09-25 | 2001-09-11 | Seagate Technolocy Llc | Top down assembly of a disk drive actuator using a tolerance ring and a post |
DE19983579T1 (en) | 1998-09-25 | 2001-08-16 | Seagate Technology Llc | Reduction of residues on an actuator arrangement |
US6480363B1 (en) | 2000-05-22 | 2002-11-12 | International Business Machines Corporation | Hard disk drive actuator assembly with damped tolerance ring for enhancing drive performance during structural resonance modes |
GB0308957D0 (en) * | 2003-04-17 | 2003-05-28 | Lillishall Plastics And Engine | Tolerance ring assembly |
US20040246627A1 (en) * | 2003-06-06 | 2004-12-09 | Durrum Thomas M. | Disc drive pivot bearing assembly |
JP2005339655A (en) * | 2004-05-26 | 2005-12-08 | Hitachi Global Storage Technologies Netherlands Bv | Rotating-disk type storage device |
US20060181811A1 (en) | 2005-02-17 | 2006-08-17 | Hanrahan Kevin P | Tolerance ring with debris-reducing profile |
GB0615672D0 (en) | 2006-08-07 | 2006-09-13 | Rencol Tolerance Rings Ltd | Assembly of a shaft and a housing assembly |
ES2447591T3 (en) * | 2008-05-14 | 2014-03-12 | Saint-Gobain Performance Plastics Rencol Ltd. | Mounting method and device |
MY172768A (en) | 2012-04-30 | 2019-12-12 | Saint Gobain Performance Plastics Rencol Ltd | Tolerance ring with perforated waves |
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