Data storage device attenuating interference from first spiral track when reading second spiral track

Information

  • Patent Grant
  • 9208810
  • Patent Number
    9,208,810
  • Date Filed
    Thursday, December 4, 2014
    10 years ago
  • Date Issued
    Tuesday, December 8, 2015
    9 years ago
  • CPC
  • Field of Search
    • US
    • 360 053000
    • 360 055000
    • 360 039000
    • 360 075000
    • 360 069000
    • 360 077010
    • 360 057000
    • 360 048000
    • 360 077080
    • CPC
    • G11B20/10009
    • G11B27/36
    • G11B5/012
    • G11B5/00
    • G11B2220/90
    • G11B5/6005
    • G11B5/024
    • G11B5/0086
    • G11B5/02
  • International Classifications
    • G11B5/02
    • G11B5/596
Abstract
A data storage device is disclosed comprising a disk surface comprising a first spiral track at least partially overwritten by a second spiral track, and a head actuated over the disk surface based on the second spiral track. The first spiral track comprises a periodic pattern written at a first frequency, and the second spiral track comprises a periodic pattern written at a second frequency different from the first frequency.
Description
BACKGROUND

When manufacturing a disk drive, concentric servo sectors 60-6N are written to a disk 2 which define a plurality of radially-spaced, concentric servo tracks 6 as shown in the prior art disk format of FIG. 1. A plurality of concentric data tracks are defined relative to the servo tracks 4, wherein the data tracks may have the same or a different radial density (tracks per inch (TPI)) than the servo tracks 4. Each servo sector (e.g., servo sector 64) comprises a preamble 8 for synchronizing gain control and timing recovery, a sync mark 10 for synchronizing to a data field 12 comprising coarse head positioning information such as a track number, and servo bursts 14 which provide fine head positioning information. The coarse head position information is processed to position a head over a target data track during a seek operation, and the servo bursts 14 are processed to maintain the head over a centerline of the target data track while writing or reading data during a tracking operation.


In the past, external servo writers have been used to write the concentric servo sectors 20-2N to the disk surface during manufacturing. External servo writers employ extremely accurate head positioning mechanics, such as a laser interferometer, to ensure the concentric servo sectors 20-2N are written at the proper radial location from the outer diameter of the disk to the inner diameter of the disk. However, external servo writers are expensive and require a clean room environment so that a head positioning pin can be inserted into the head disk assembly (HDA) without contaminating the disk. Thus, external servo writers have become an expensive bottleneck in the disk drive manufacturing process.


The prior art has suggested various “self-servo” writing methods wherein the internal electronics of the disk drive are used to write the concentric servo sectors independent of an external servo writer. For example, a known technique for self-servo writing a disk drive is to first write a plurality of spiral tracks to the disk, and then to servo on the spiral tracks while writing a plurality of servo sectors that define concentric servo tracks such as shown in FIG. 1.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 shows a prior art disk format comprising a plurality of servo tracks defined by servo sectors.



FIG. 2A shows a data storage device in the form of a disk drive according to an embodiment comprising a head actuated over a disk surface.



FIG. 2B is a flow diagram according to an embodiment wherein while reading a first spiral track on the disk surface a second spiral track is simultaneously written on the disk surface.



FIG. 2C illustrates the writing of a second spiral track while simultaneous reading a first spiral track according to an embodiment, wherein the second spiral track is written in an opposite radial direction as the first spiral track.



FIG. 3 illustrates the writing of a second spiral track while simultaneous reading a first spiral track according to an embodiment, wherein the second spiral track is written in the same radial direction as the first spiral track.



FIG. 4A illustrates an embodiment wherein the first spiral track comprises a periodic pattern written at a first frequency, and the second spiral track comprises a periodic pattern written at a second frequency different from the first frequency.



FIG. 4B shows an embodiment wherein a read signal generated while reading the first spiral track is bandpass filtered based on the frequency of the first spiral track to attenuate crosstalk caused by simultaneously writing the second spiral track on the disk surface at the second frequency.



FIG. 5A shows a data storage device in the form of a disk drive comprising a head actuated over a disk surface comprising a first spiral track at least partially overwritten by a second spiral track.



FIG. 5B is a flow diagram according to an embodiment wherein the head is servoed over the disk surface based on the second spiral track.



FIG. 5C illustrates an embodiment wherein the read element of the head passes over the second spiral track as well as part of the first spiral track.



FIG. 6 illustrates an embodiment wherein a ratio of frequencies between the first and second spiral tracks attenuates interference from the first spiral track when demodulating the read signal generated while reading the second spiral track.



FIG. 7 shows an embodiment wherein the read signal is filtered with a bandpass filter to attenuate interference from the first spiral track.



FIG. 8A shows an embodiment wherein sync marks in the first spiral track may interfere with the spectral signature of the second spiral track.



FIG. 8B shows an embodiment wherein the first spiral track consists primarily of a periodic pattern without sync marks, whereas the second spiral track comprises a periodic pattern with sync marks.



FIG. 8C shows an embodiment wherein recording the first spiral tracks without sync marks removes the interference from the spectral signature of the second spiral track as compared to FIG. 8A.





DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION


FIG. 2A shows a data storage device in the form of a disk drive according to an embodiment comprising a disk surface 16 comprising a first spiral track 18, and a head 20 actuated over the disk surface 16. The disk drive further comprises control circuitry 22 configured to execute the flow diagram of FIG. 2B, wherein while reading the first spiral track 18 a second spiral track 24 is simultaneously written on the disk surface (block 25).


In one embodiment, the first spiral track 18 may be considered a “bootstrap” spiral track from which the head 20 may be servoed in order to write the second spiral track 24 which may be considered a servo spiral track. In one embodiment, the disk surface 16 may comprise a plurality of bootstrap spiral tracks which may be read in order to write a plurality of servo spiral tracks. The servo spiral tracks may then be processed in order to servo the head 20 radially over the disk surface 16 in order to write servo sectors that define concentric servo tracks. In another embodiment, the servo spiral tracks may be used as a final servo pattern for servoing the head during normal access operations without needing to write servo sectors to the disk surface.


In one embodiment, the first spiral track 18 (as well as other similar spiral tracks if needed) may be self-written to the disk surface 16 by the control circuitry 22 internal to the disk drive. An example embodiment for self-writing spiral tracks is disclosed in U.S. Pat. No. 8,634,283 entitled “DISK DRIVE PERFORMING IN-DRIVE SPIRAL TRACK WRITING” the disclosure of which is incorporated herein by reference. In another embodiment, the first spiral track 18 (e.g., bootstrap spiral track) may be written to the disk surface 16 using an external servo writer prior to installing the disk into the disk drive.



FIGS. 2A and 2C illustrate an example embodiment wherein the second spiral track 24 is written in an opposite radial direction as the first spiral track 18. That is, the first spiral track 18 is written from the inner diameter (ID) of the disk surface 16 toward the outer diameter (OD) of the disk surface 16, and the second spiral track 24 is written from the OD to the ID of the disk surface 16. FIG. 2C also illustrates an embodiment wherein the head 20 comprises a read element 26 that is offset circumferentially from a write element 28 by a reader/writer gap. Accordingly in this embodiment while writing the second spiral track 24 the read element 26 travels along trajectory 30A and reaches the first spiral track 18 before the write element 28 overwrites the first spiral track 18 while travelling along trajectory 30B. In this manner, even if the read element 26 and the write element 28 are aligned so as to both travel along trajectory 30B, the read element 26 reads the first spiral track 18 before it is overwritten by the write element 28.


In another embodiment illustrated in FIG. 3, the second spiral track 32 is written in the same radial direction as the first spiral track 34 (e.g., from the OD to the ID). In this embodiment, the second spiral track 32 is written at a different radial velocity than the first spiral track 34 such that the slope of the second spiral track 32 is different from the slope of the first spiral track 34. This ensures the head 20 will cross over the first spiral track 34 when writing the second spiral track 32 as illustrated in FIG. 3. In the example of FIG. 3, the second spiral track 32 is written at a higher radial velocity than the first spiral track 34 such that the slope of the second spiral track 32 is greater than the slope of the first spiral track 34. In another embodiment, the second spiral track 32 may be written at a lower radial velocity than the first spiral track 34.



FIG. 4A illustrates an embodiment wherein the first spiral track 18 comprises a periodic pattern written at a first frequency (periodically interrupted by a sync mark), and the second spiral track 24 comprises a periodic pattern written at a second frequency (periodically interrupted by a sync mark) different from the first frequency. This embodiment may help attenuate crosstalk in the read signal generated while reading the first spiral track 18 while simultaneously writing the second spiral track 24. In one embodiment, the control circuitry may filter the read signal generated while reading the first spiral track 18 based on the frequency of the periodic pattern in the first spiral track 18. FIG. 4B illustrates an example of this embodiment wherein the control circuitry may bandpass filter the read signal to extract the frequency component in the read signal corresponding to the periodic pattern in the first spiral track 18.


In the example of FIGS. 4A and 4B, the periodic pattern in the first spiral track 18 comprises a lower frequency than the periodic pattern in the second spiral track 24. However, in other embodiments the periodic pattern in the first spiral track 18 may comprise a higher frequency than the periodic pattern in the second spiral track 24. Any suitable delta between the frequencies may be employed, and in one embodiment the frequencies and the delta are selected to reduce the implementation cost and complexity of the bandpass filter.


In the embodiment of FIG. 2C, the second spiral track 24 is written continuously so as to eventually overwrite the first spiral track 18 as the write element 28 passes over the first spiral track 18. This embodiment may improve performance while servoing on the second spiral track 24 since in one embodiment there are no gaps (or a reduced number of gaps) in the second spiral track 24. In one embodiment, when reading the second spiral track 24, for example to servo the head 20 over the disk surface 16 while writing servo sectors of concentric servo tracks, the resulting read signal may be filtered based on the frequency of the periodic pattern in the second spiral track 24. For example, the read signal may be bandpass filtered so as to extract the frequency component corresponding to the second spiral track 24, thereby attenuating interference from the periodic pattern in the first spiral track 18 near the locations where the second spiral track 24 overwrites the first spiral track 18.



FIG. 5A shows a data storage device in the form of a disk drive according to an embodiment comprising a disk surface 16 comprising a first spiral track 18 at least partially overwritten by a second spiral track 24. The disk drive further comprises control circuitry 22 configured to execute the flow diagram of FIG. 5B, wherein a head 20 is actuated over the disk surface 16 based on the second spiral track 24 (block 35).



FIGS. 5A and 5C illustrates an example embodiment wherein the second spiral track 24 is written in an opposite radial direction as the first spiral track 18 similar to the embodiment described above with reference to FIG. 2C. In one embodiment, the control circuitry 22 servos the head 20 in a substantially concentric path 36, for example, while writing concentric servo sectors to the disk such as shown in FIG. 1. As illustrated in FIG. 5C, the read element 26 may pass over the second spiral track 24 at a radial location where the second spiral track 24 overwrites the first spiral track 18, and therefore there may be interference in the read signal due to reading at least part of the first spiral track 18. This interference may reduce the accuracy of the resulting position signal generated based on demodulating the second spiral track 24. Accordingly, in order to reduce this interference, in one embodiment the first spiral track 18 comprises a periodic pattern written at a first frequency, and the second spiral track 24 comprises a periodic pattern written at a second frequency different from the first frequency. In the embodiment shown in FIG. 5C, the second frequency is higher than the first frequency; however in another embodiment the second frequency may be lower than the first frequency.


In one embodiment, the second spiral track 24 may be demodulated by processing the read signal samples to compute a discrete Fourier transform (DFT) at the second frequency using any suitable technique. When demodulating the second spiral track 24 using a DFT, the interference from the first spiral track 18 may be attenuated when the ratio between the second frequency and the first frequency is substantially an integer plus one-half as shown in FIG. 6. The ratio may be inverted in the embodiment where the second frequency is lower than the first frequency (i.e., the interference from the first spiral track 18 may be attenuated when the ratio between the first frequency and the second frequency is substantially an integer plus one-half). In another embodiment shown in FIG. 7, the control circuitry 22 may bandpass filter the read signal proximate the second frequency, thereby attenuating interference from the first spiral track 18. The bandpass filtering may be implemented in any suitable manner, including in the analog domain and/or in the digital domain.


In the embodiment of FIG. 4A, the first spiral track 18 may comprise a periodic pattern written at a first frequency as well as sync marks which may facilitate demodulating the spiral track when writing the second spiral track 24. However, in one embodiment the sync marks in the first spiral track 18 may interfere with the demodulation of the second spiral track 24 when attempting to servo on the second spiral track 24 (e.g., when writing concentric servo sectors). This embodiment is illustrated in FIG. 8A wherein the frequency spectrum of the first spiral track 18 may comprise a peak at the frequency of the periodic pattern, as well as a frequency component 38 due to the sync marks that may overlap with the peak frequency component of the second spiral track 24. Accordingly, in one embodiment illustrated in FIG. 8B the first spiral track 18 may be written without sync marks (i.e., consist primarily of the periodic pattern written at the first frequency), thereby avoiding the interference when demodulating the second spiral track 24 by removing the frequency component as illustrated in FIG. 8C. In one embodiment, the first spiral track 18 may be demodulated using other techniques not based on sync marks. For example, the first spiral track 18 may be demodulated by evaluating a peak in the read signal generated when reading the first spiral track 18.


Any suitable control circuitry may be employed to implement the flow diagrams in the above embodiments, such as any suitable integrated circuit or circuits. For example, the control circuitry may be implemented within a read channel integrated circuit, or in a component separate from the read channel, such as a disk controller, or certain operations described above may be performed by a read channel and others by a disk controller. In one embodiment, the read channel and disk controller are implemented as separate integrated circuits, and in an alternative embodiment they are fabricated into a single integrated circuit or system on a chip (SOC). In addition, the control circuitry may include a suitable preamp circuit implemented as a separate integrated circuit, integrated into the read channel or disk controller circuit, or integrated into a SOC.


In one embodiment, the control circuitry comprises a microprocessor executing instructions, the instructions being operable to cause the microprocessor to perform the flow diagrams described herein. The instructions may be stored in any computer-readable medium. In one embodiment, they may be stored on a non-volatile semiconductor memory external to the microprocessor, or integrated with the microprocessor in a SOC. In another embodiment, the instructions are stored on the disk and read into a volatile semiconductor memory when the disk drive is powered on. In yet another embodiment, the control circuitry comprises suitable logic circuitry, such as state machine circuitry.


While the above examples concern a disk drive, the various embodiments are not limited to a disk drive and can be applied to other data storage devices and systems, such as magnetic tape drives, solid state drives, hybrid drives, etc. In addition, some embodiments may include electronic devices such as computing devices, data server devices, media content storage devices, etc. that comprise the storage media and/or control circuitry as described above.


The various features and processes described above may be used independently of one another, or may be combined in various ways. All possible combinations and subcombinations are intended to fall within the scope of this disclosure. In addition, certain method, event or process blocks may be omitted in some implementations. The methods and processes described herein are also not limited to any particular sequence, and the blocks or states relating thereto can be performed in other sequences that are appropriate. For example, described tasks or events may be performed in an order other than that specifically disclosed, or multiple may be combined in a single block or state. The example tasks or events may be performed in serial, in parallel, or in some other manner. Tasks or events may be added to or removed from the disclosed example embodiments. The example systems and components described herein may be configured differently than described. For example, elements may be added to, removed from, or rearranged compared to the disclosed example embodiments.


While certain example embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions disclosed herein. Thus, nothing in the foregoing description is intended to imply that any particular feature, characteristic, step, module, or block is necessary or indispensable. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the embodiments disclosed herein.

Claims
  • 1. A data storage device comprising: a disk surface comprising a first spiral track at least partially overwritten by a second spiral track;a head actuated over the disk surface; andcontrol circuitry configured to servo the head over the disk surface based on the second spiral track;wherein: the first spiral track comprises a periodic pattern written at a first frequency; andthe second spiral track comprises a periodic pattern written at a second frequency different from the first frequency.
  • 2. The data storage device as recited in claim 1, wherein a ratio between the first frequency and the second frequency is substantially an integer plus one-half.
  • 3. The data storage device as recited in claim 1, wherein a ratio between the second frequency and the first frequency is substantially an integer plus one-half.
  • 4. The data storage device as recited in claim 1, wherein the control circuitry is further configured to: generate a read signal while reading the second spiral track; andfilter the read signal based on the second frequency to attenuate crosstalk caused by the first spiral track.
  • 5. The data storage device as recited in claim 4, wherein the control circuitry is further configured to bandpass filter the read signal proximate the second frequency.
  • 6. The data storage device as recited in claim 4, wherein: the first spiral track consists of the first periodic pattern; andthe second spiral track comprises a sync mark periodically interrupting the second periodic pattern.
  • 7. The data storage device as recited in claim 1, wherein: the first spiral track consists of the first periodic pattern; andthe second spiral track comprises a sync mark periodically interrupting the second periodic pattern.
  • 8. A method of operating a data storage device, the method comprising servoing a head over a disk surface based on a second spiral track on the disk surface, wherein: a first spiral track on the disk surface is at least partially overwritten by the second spiral track;the first spiral track comprises a periodic pattern written at a first frequency; andthe second spiral track comprises a periodic pattern written at a second frequency different from the first frequency.
  • 9. The method as recited in claim 8, wherein a ratio between the first frequency and the second frequency is substantially an integer plus one-half.
  • 10. The method as recited in claim 8, wherein a ratio between the second frequency and the first frequency is substantially an integer plus one-half.
  • 11. The method as recited in claim 8, further comprising: generating a read signal while reading the second spiral track; andfiltering the read signal based on the second frequency to attenuate crosstalk caused by the first spiral track.
  • 12. The method as recited in claim 11, further comprising bandpass filtering the read signal proximate the second frequency.
  • 13. The method as recited in claim 11, wherein: the first spiral track consists of the first periodic pattern; andthe second spiral track comprises a sync mark periodically interrupting the second periodic pattern.
  • 14. The method as recited in claim 8, wherein: the first spiral track consists of the first periodic pattern; andthe second spiral track comprises a sync mark periodically interrupting the second periodic pattern.
Parent Case Info

This application is a continuation-in-part of U.S. patent application Ser. No. 14/260,503, filed on Apr. 24, 2014, entitled “DATA STORAGE DEVICE READING FIRST SPIRAL TRACK WHILE SIMULTANEOUSLY WRITING SECOND SPIRAL TRACK” to Charles A. Park et al., the disclosure of which is incorporated herein by reference.

US Referenced Citations (385)
Number Name Date Kind
5600623 Miyazaki et al. Feb 1997 A
5668679 Swearingen et al. Sep 1997 A
5754352 Behrens et al. May 1998 A
6005727 Behrens et al. Dec 1999 A
6014283 Codilian et al. Jan 2000 A
6021012 Bang Feb 2000 A
6038209 Satoh Mar 2000 A
6052076 Patton, III et al. Apr 2000 A
6052250 Golowka et al. Apr 2000 A
6067206 Hull et al. May 2000 A
6078453 Dziallo et al. Jun 2000 A
6091564 Codilian et al. Jul 2000 A
6094020 Goretzki et al. Jul 2000 A
6101065 Alfred et al. Aug 2000 A
6104153 Codilian et al. Aug 2000 A
6122133 Nazarian et al. Sep 2000 A
6122135 Stich Sep 2000 A
6141175 Nazarian et al. Oct 2000 A
6160368 Plutowski Dec 2000 A
6181502 Hussein et al. Jan 2001 B1
6191906 Buch Feb 2001 B1
6195222 Heminger et al. Feb 2001 B1
6198584 Codilian et al. Mar 2001 B1
6198590 Codilian et al. Mar 2001 B1
6204988 Codilian et al. Mar 2001 B1
6243223 Elliott et al. Jun 2001 B1
6281652 Ryan et al. Aug 2001 B1
6285521 Hussein Sep 2001 B1
6292318 Hayashi Sep 2001 B1
6292320 Mason et al. Sep 2001 B1
6304407 Baker et al. Oct 2001 B1
6310742 Nazarian et al. Oct 2001 B1
6320718 Bouwkamp et al. Nov 2001 B1
6342984 Hussein et al. Jan 2002 B1
6347018 Kadlec et al. Feb 2002 B1
6369972 Codilian et al. Apr 2002 B1
6369974 Asgari et al. Apr 2002 B1
6411453 Chainer et al. Jun 2002 B1
6462896 Codilian et al. Oct 2002 B1
6476996 Ryan Nov 2002 B1
6484577 Bennett Nov 2002 B1
6493169 Ferris et al. Dec 2002 B1
6496324 Golowka et al. Dec 2002 B1
6498698 Golowka et al. Dec 2002 B1
6507450 Elliott Jan 2003 B1
6519107 Ehrlich et al. Feb 2003 B1
6534936 Messenger et al. Mar 2003 B2
6538839 Ryan Mar 2003 B1
6545835 Codilian et al. Apr 2003 B1
6549359 Bennett et al. Apr 2003 B1
6549361 Bennett et al. Apr 2003 B1
6560056 Ryan May 2003 B1
6568268 Bennett May 2003 B1
6574062 Bennett et al. Jun 2003 B1
6577465 Bennett et al. Jun 2003 B1
6587293 Ding et al. Jul 2003 B1
6614615 Ju et al. Sep 2003 B1
6614618 Sheh et al. Sep 2003 B1
6636377 Yu et al. Oct 2003 B1
6690536 Ryan Feb 2004 B1
6693764 Sheh et al. Feb 2004 B1
6704156 Baker et al. Mar 2004 B1
6707635 Codilian et al. Mar 2004 B1
6710953 Vallis et al. Mar 2004 B1
6710966 Codilian et al. Mar 2004 B1
6714371 Codilian Mar 2004 B1
6714372 Codilian et al. Mar 2004 B1
6724564 Codilian et al. Apr 2004 B1
6731450 Codilian et al. May 2004 B1
6735041 Codilian et al. May 2004 B1
6738205 Moran et al. May 2004 B1
6738220 Codilian May 2004 B1
6747837 Bennett Jun 2004 B1
6760186 Codilian et al. Jul 2004 B1
6788483 Ferris et al. Sep 2004 B1
6791785 Messenger et al. Sep 2004 B1
6795268 Ryan Sep 2004 B1
6819518 Melkote et al. Nov 2004 B1
6826006 Melkote et al. Nov 2004 B1
6826007 Patton, III Nov 2004 B1
6847502 Codilian Jan 2005 B1
6850383 Bennett Feb 2005 B1
6850384 Bennett Feb 2005 B1
6867944 Ryan Mar 2005 B1
6876508 Patton, III et al. Apr 2005 B1
6882496 Codilian et al. Apr 2005 B1
6885514 Codilian et al. Apr 2005 B1
6900958 Yi et al. May 2005 B1
6900959 Gardner et al. May 2005 B1
6903897 Wang et al. Jun 2005 B1
6914740 Tu et al. Jul 2005 B1
6914743 Narayana et al. Jul 2005 B1
6920004 Codilian et al. Jul 2005 B1
6924959 Melkote et al. Aug 2005 B1
6924960 Melkote et al. Aug 2005 B1
6924961 Melkote et al. Aug 2005 B1
6934114 Codilian et al. Aug 2005 B1
6934135 Ryan Aug 2005 B1
6937420 McNab et al. Aug 2005 B1
6937423 Ngo et al. Aug 2005 B1
6943978 Lee Sep 2005 B1
6952322 Codilian et al. Oct 2005 B1
6954324 Tu et al. Oct 2005 B1
6958881 Codilian et al. Oct 2005 B1
6963465 Melkote et al. Nov 2005 B1
6965488 Bennett Nov 2005 B1
6967458 Bennett et al. Nov 2005 B1
6967799 Lee Nov 2005 B1
6967811 Codilian et al. Nov 2005 B1
6970319 Bennett et al. Nov 2005 B1
6972539 Codilian et al. Dec 2005 B1
6972540 Wang et al. Dec 2005 B1
6972922 Subrahmanyam et al. Dec 2005 B1
6975480 Codilian et al. Dec 2005 B1
6977789 Cloke Dec 2005 B1
6980389 Kupferman Dec 2005 B1
6985316 Liikanen et al. Jan 2006 B1
6987636 Chue et al. Jan 2006 B1
6987639 Yu Jan 2006 B1
6989954 Lee et al. Jan 2006 B1
6992848 Agarwal et al. Jan 2006 B1
6992851 Cloke Jan 2006 B1
6992852 Ying et al. Jan 2006 B1
6995941 Miyamura et al. Feb 2006 B1
6999263 Melkote et al. Feb 2006 B1
6999267 Melkote et al. Feb 2006 B1
7002761 Sutardja et al. Feb 2006 B1
7006320 Bennett et al. Feb 2006 B1
7016134 Agarwal et al. Mar 2006 B1
7019937 Liikanen et al. Mar 2006 B1
7023637 Kupferman Apr 2006 B1
7023640 Codilian et al. Apr 2006 B1
7027256 Subrahmanyam et al. Apr 2006 B1
7027257 Kupferman Apr 2006 B1
7035026 Codilian et al. Apr 2006 B2
7046472 Melkote et al. May 2006 B1
7050249 Chue et al. May 2006 B1
7050254 Yu et al. May 2006 B1
7050258 Codilian May 2006 B1
7054098 Yu et al. May 2006 B1
7061714 Yu Jun 2006 B1
7064918 Codilian et al. Jun 2006 B1
7068451 Wang et al. Jun 2006 B1
7068459 Cloke et al. Jun 2006 B1
7068461 Chue et al. Jun 2006 B1
7068463 Ji et al. Jun 2006 B1
7088533 Shepherd et al. Aug 2006 B1
7088547 Wang et al. Aug 2006 B1
7095579 Ryan et al. Aug 2006 B1
7110208 Miyamura et al. Sep 2006 B1
7110214 Tu et al. Sep 2006 B1
7113362 Lee et al. Sep 2006 B1
7113365 Ryan et al. Sep 2006 B1
7116505 Kupferman Oct 2006 B1
7126781 Bennett Oct 2006 B1
7133233 Ray et al. Nov 2006 B1
7136253 Liikanen et al. Nov 2006 B1
7145744 Clawson et al. Dec 2006 B1
7158329 Ryan Jan 2007 B1
7180703 Subrahmanyam et al. Feb 2007 B1
7184230 Chue et al. Feb 2007 B1
7196864 Yi et al. Mar 2007 B1
7199966 Tu et al. Apr 2007 B1
7203021 Ryan et al. Apr 2007 B1
7209321 Bennett Apr 2007 B1
7212364 Lee May 2007 B1
7212374 Wang et al. May 2007 B1
7215504 Bennett May 2007 B1
7224546 Orakcilar et al. May 2007 B1
7230786 Ray et al. Jun 2007 B1
7248426 Weerasooriya et al. Jul 2007 B1
7251098 Wang et al. Jul 2007 B1
7253582 Ding et al. Aug 2007 B1
7253989 Lau et al. Aug 2007 B1
7256956 Ehrlich Aug 2007 B2
7265933 Phan et al. Sep 2007 B1
7289288 Tu Oct 2007 B1
7298574 Melkote et al. Nov 2007 B1
7301717 Lee et al. Nov 2007 B1
7304819 Melkote et al. Dec 2007 B1
7330019 Bennett Feb 2008 B1
7330327 Chue et al. Feb 2008 B1
7333280 Lifchits et al. Feb 2008 B1
7333286 Jung et al. Feb 2008 B2
7333290 Kupferman Feb 2008 B1
7339761 Tu et al. Mar 2008 B1
7365932 Bennett Apr 2008 B1
7382564 Everett et al. Jun 2008 B1
7388728 Chen et al. Jun 2008 B1
7391583 Sheh et al. Jun 2008 B1
7391584 Sheh et al. Jun 2008 B1
7405897 Dougherty et al. Jul 2008 B2
7411758 Cheung et al. Aug 2008 B1
7414809 Smith et al. Aug 2008 B2
7433143 Ying et al. Oct 2008 B1
7440210 Lee Oct 2008 B1
7440225 Chen et al. Oct 2008 B1
7450334 Wang et al. Nov 2008 B1
7450336 Wang et al. Nov 2008 B1
7453661 Jang et al. Nov 2008 B1
7457071 Sheh Nov 2008 B1
7466509 Chen et al. Dec 2008 B1
7468855 Weerasooriya et al. Dec 2008 B1
7477471 Nemshick et al. Jan 2009 B1
7480116 Bennett Jan 2009 B1
7486460 Tsuchinaga et al. Feb 2009 B2
7489464 McNab et al. Feb 2009 B1
7492546 Miyamura Feb 2009 B1
7495857 Bennett Feb 2009 B1
7499236 Lee et al. Mar 2009 B1
7502192 Wang et al. Mar 2009 B1
7502195 Wu et al. Mar 2009 B1
7502197 Chue Mar 2009 B1
7505223 McCornack Mar 2009 B1
7522370 Sutardja Apr 2009 B1
7529055 Laks et al. May 2009 B1
7542225 Ding et al. Jun 2009 B1
7548392 Desai et al. Jun 2009 B1
7551387 Sun et al. Jun 2009 B2
7551390 Wang et al. Jun 2009 B1
7558016 Le et al. Jul 2009 B1
7561361 Rutherford Jul 2009 B1
7573670 Ryan et al. Aug 2009 B1
7576941 Chen et al. Aug 2009 B1
7580212 Li et al. Aug 2009 B1
7583470 Chen et al. Sep 2009 B1
7595954 Chen et al. Sep 2009 B1
7602575 Lifchits et al. Oct 2009 B1
7616399 Chen et al. Nov 2009 B1
7619844 Bennett Nov 2009 B1
7619846 Shepherd et al. Nov 2009 B2
7623313 Liikanen et al. Nov 2009 B1
7626782 Yu et al. Dec 2009 B1
7630162 Zhao et al. Dec 2009 B2
7639445 Matsunaga et al. Dec 2009 B2
7639446 Mizukoshi et al. Dec 2009 B2
7639447 Yu et al. Dec 2009 B1
7656604 Liang et al. Feb 2010 B1
7656607 Bennett Feb 2010 B1
7660067 Ji et al. Feb 2010 B1
7663835 Yu et al. Feb 2010 B1
7675705 Mizukoshi et al. Mar 2010 B2
7675707 Liu et al. Mar 2010 B1
7679854 Narayana et al. Mar 2010 B1
7688534 McCornack Mar 2010 B1
7688538 Chen et al. Mar 2010 B1
7688539 Bryant et al. Mar 2010 B1
7697233 Bennett et al. Apr 2010 B1
7701661 Bennett Apr 2010 B1
7710676 Chue May 2010 B1
7715138 Kupferman May 2010 B1
7715143 Bliss et al. May 2010 B2
7728539 Smith et al. Jun 2010 B2
7729079 Huber Jun 2010 B1
7733189 Bennett Jun 2010 B1
7733588 Ying Jun 2010 B1
7737793 Ying et al. Jun 2010 B1
7746592 Liang et al. Jun 2010 B1
7746594 Guo et al. Jun 2010 B1
7746595 Guo et al. Jun 2010 B1
7751144 Sutardja Jul 2010 B1
7760461 Bennett Jul 2010 B1
7787211 Kim et al. Aug 2010 B2
7800853 Guo et al. Sep 2010 B1
7800856 Bennett et al. Sep 2010 B1
7800857 Calaway et al. Sep 2010 B1
7839591 Weerasooriya et al. Nov 2010 B1
7839595 Chue et al. Nov 2010 B1
7839600 Babinski et al. Nov 2010 B1
7843662 Weerasooriya et al. Nov 2010 B1
7852588 Ferris et al. Dec 2010 B1
7852592 Liang et al. Dec 2010 B1
7852598 Sutardja Dec 2010 B1
7864481 Kon et al. Jan 2011 B1
7864482 Babinski et al. Jan 2011 B1
7869155 Wong Jan 2011 B1
7876522 Calaway et al. Jan 2011 B1
7876523 Panyavoravaj et al. Jan 2011 B1
7881004 Kumbla et al. Feb 2011 B2
7881005 Cheung et al. Feb 2011 B1
7916415 Chue Mar 2011 B1
7916416 Guo et al. Mar 2011 B1
7916420 McFadyen et al. Mar 2011 B1
7916422 Guo et al. Mar 2011 B1
7929238 Vasquez Apr 2011 B1
7961422 Chen et al. Jun 2011 B1
8000053 Anderson Aug 2011 B1
8027114 Han et al. Sep 2011 B1
8031423 Tsai et al. Oct 2011 B1
8054022 Ryan et al. Nov 2011 B1
8059357 Knigge et al. Nov 2011 B1
8059360 Melkote et al. Nov 2011 B1
8072703 Calaway et al. Dec 2011 B1
8077428 Chen et al. Dec 2011 B1
8078901 Meyer et al. Dec 2011 B1
8081395 Ferris Dec 2011 B1
8085020 Bennett Dec 2011 B1
8116023 Kupferman Feb 2012 B1
8145934 Ferris et al. Mar 2012 B1
8179626 Ryan et al. May 2012 B1
8189286 Chen et al. May 2012 B1
8213106 Guo et al. Jul 2012 B1
8254222 Tang Aug 2012 B1
8300348 Liu et al. Oct 2012 B1
8315005 Zou et al. Nov 2012 B1
8320069 Knigge et al. Nov 2012 B1
8351174 Gardner et al. Jan 2013 B1
8358114 Ferris et al. Jan 2013 B1
8358145 Ferris et al. Jan 2013 B1
8390367 Bennett Mar 2013 B1
8427932 Inoue et al. Apr 2013 B2
8432031 Agness et al. Apr 2013 B1
8432629 Rigney et al. Apr 2013 B1
8451697 Rigney et al. May 2013 B1
8462458 Ton-That et al. Jun 2013 B1
8482873 Chue et al. Jul 2013 B1
8498076 Sheh et al. Jul 2013 B1
8498172 Patton, III et al. Jul 2013 B1
8508881 Babinski et al. Aug 2013 B1
8531798 Xi et al. Sep 2013 B1
8537486 Liang et al. Sep 2013 B2
8542455 Huang et al. Sep 2013 B2
8553351 Narayana et al. Oct 2013 B1
8564899 Lou et al. Oct 2013 B2
8576506 Wang et al. Nov 2013 B1
8605382 Mallary et al. Dec 2013 B1
8605384 Liu et al. Dec 2013 B1
8610391 Yang et al. Dec 2013 B1
8611040 Xi et al. Dec 2013 B1
8619385 Guo et al. Dec 2013 B1
8630054 Bennett et al. Jan 2014 B2
8630059 Chen et al. Jan 2014 B1
8634154 Rigney et al. Jan 2014 B1
8634283 Rigney et al. Jan 2014 B1
8643976 Wang et al. Feb 2014 B1
8649121 Smith et al. Feb 2014 B1
8654466 McFadyen Feb 2014 B1
8654467 Wong et al. Feb 2014 B1
8665546 Zhao et al. Mar 2014 B1
8665551 Rigney et al. Mar 2014 B1
8670206 Liang et al. Mar 2014 B1
8687308 Katchmart Apr 2014 B1
8687312 Liang Apr 2014 B1
8693123 Guo et al. Apr 2014 B1
8693134 Xi et al. Apr 2014 B1
8699173 Kang et al. Apr 2014 B1
8711027 Bennett Apr 2014 B1
8717696 Ryan et al. May 2014 B1
8717699 Ferris May 2014 B1
8717704 Yu et al. May 2014 B1
8724245 Smith et al. May 2014 B1
8724253 Liang et al. May 2014 B1
8724524 Urabe et al. May 2014 B2
8737008 Watanabe et al. May 2014 B1
8737013 Zhou et al. May 2014 B2
8743495 Chen et al. Jun 2014 B1
8743503 Tang et al. Jun 2014 B1
8743504 Bryant et al. Jun 2014 B1
8749904 Liang et al. Jun 2014 B1
8760796 Lou et al. Jun 2014 B1
8767332 Chahwan et al. Jul 2014 B1
8767343 Helmick et al. Jul 2014 B1
8767354 Ferris et al. Jul 2014 B1
8773787 Beker Jul 2014 B1
8779574 Agness et al. Jul 2014 B1
8780473 Zhao et al. Jul 2014 B1
8780477 Guo et al. Jul 2014 B1
8780479 Helmick et al. Jul 2014 B1
8780489 Gayaka et al. Jul 2014 B1
8792202 Wan et al. Jul 2014 B1
8797664 Guo et al. Aug 2014 B1
8804267 Huang et al. Aug 2014 B2
8824081 Guo et al. Sep 2014 B1
8824262 Liu et al. Sep 2014 B1
8917474 Rigney et al. Dec 2014 B1
20060171059 Chan et al. Aug 2006 A1
20070070538 Lau et al. Mar 2007 A1
20070076314 Rigney Apr 2007 A1
20070211367 Lau et al. Sep 2007 A1
20070291401 Sun et al. Dec 2007 A1
20090086357 Ehrlich Apr 2009 A1
20100035085 Jung et al. Feb 2010 A1
20120284493 Lou et al. Nov 2012 A1
20130120870 Zhou et al. May 2013 A1
20130148240 Ferris et al. Jun 2013 A1
Non-Patent Literature Citations (4)
Entry
Charles A. Park, et al., U.S. Appl. No. 14/260,503 12 pgs.
OA dated Jul. 17, 2014 from U.S. Appl. No. 14/260,503 53 pgs.
NOA dated Nov. 7, 2014 from U.S. Appl. No. 14/260,503 6 pgs.
NOA dated Dec. 26, 2014 from U.S. Appl. No. 14/260,503 2 pgs.
Continuation in Parts (1)
Number Date Country
Parent 14260503 Apr 2014 US
Child 14560407 US