Piezoelectric actuator and sensor for disk drive dual-stage servo systems
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G11B-021/02
G11B-005/596
G11B-017/00
G11B-033/14
G11B-021/24
G11B-021/16
출원번호
US-0996543
(2004-11-24)
등록번호
US-7375911
(2008-05-20)
발명자
/ 주소
Li,Yunfeng
Guo,Wei
Guo,Lin
Sun,Yu
출원인 / 주소
Maxtor Corporation
대리인 / 주소
Lucente,David K.
인용정보
피인용 횟수 :
17인용 특허 :
9
초록▼
A hard disk drive is disclosed comprising at least one disk rotatable about an axis, an actuator assembly moveable relative to the disk, a transducer positioned on the actuator assembly, an actuator signal line, a piezoelectric actuator element disposed on the actuator assembly and electrically inte
A hard disk drive is disclosed comprising at least one disk rotatable about an axis, an actuator assembly moveable relative to the disk, a transducer positioned on the actuator assembly, an actuator signal line, a piezoelectric actuator element disposed on the actuator assembly and electrically interconnected to the actuator signal line, a processor, a sensor signal line and a piezoelectric sensor element for sensing a vibration. The piezoelectric sensor element is collocated with the piezoelectric actuator element and electrically interconnected to the processor by the sensor signal line. The piezoelectric actuator element is operable to move the at least one transducer relative to a surface of the disk. The piezoelectric sensor element is electrically isolated from the piezoelectric actuator element. A method for detecting a vibration in a hard disk drive actuator assembly is also disclosed.
대표청구항▼
What is claimed is: 1. A hard disk drive, comprising: at least one disk rotatable about an axis; an actuator assembly moveable relative to the disk; a transducer positioned on the actuator assembly; an actuator signal line; a processor; a piezoelectric actuator element disposed on the actuator asse
What is claimed is: 1. A hard disk drive, comprising: at least one disk rotatable about an axis; an actuator assembly moveable relative to the disk; a transducer positioned on the actuator assembly; an actuator signal line; a processor; a piezoelectric actuator element disposed on the actuator assembly and electrically interconnected to the processor by the actuator signal line, wherein the piezoelectric actuator element is operable to move the at least one transducer relative to a surface of the disk; a sensor signal line; and a piezoelectric sensor element collocated with the piezoelectric actuator element for sensing a vibration, the piezoelectric sensor element being electrically interconnected to the processor by the sensor signal line, wherein the piezoelectric sensor element is electrically isolated from the piezoelectric actuator element, and wherein the piezoelectric actuator element and the piezoelectric sensor element comprise thin-film elements formed on a common substrate. 2. The hard disk drive of claim 1, wherein the piezoelectric actuator element and the piezoelectric sensor element comprise coplanar thin-film elements on the common substrate. 3. The hard disk of claim 1, wherein the piezoelectric actuator element and the piezoelectric sensor element comprise thin-film elements formed by a single layer of piezoelectric film on the common substrate. 4. The hard disk drive of claim 3, wherein the thin-film piezoelectric actuator element and the thin-film piezoelectric sensor element are isolated from each other by etching the single layer of piezoelectric film to form the thin-film piezoelectric actuator element and the thin-film piezoelectric sensor element. 5. The hard disk drive of claim 3, wherein the thin-film piezoelectric actuator element and the thin-film piezoelectric sensor element are isolated from each other by an isolation barrier disposed between the thin-film piezoelectric actuator element and the thin-film piezoelectric sensor element. 6. The hard disk drive of claim 1, wherein the piezoelectric actuator element and the piezoelectric sensor element comprise thin-film elements that are formed by different layers of piezoelectric film on the common substrate. 7. The hard disk drive of claim 6, wherein the different layers of piezoelectric film are separated by an isolation layer. 8. The hard disk drive of claim 1, wherein the piezoelectric actuator element comprises at least one piezoelectric actuator film and the piezoelectric sensor element comprises at least one piezoelectric sensor film. 9. The hard disk drive of claim 8, wherein the at least one piezoelectric actuator film and the at least one piezoelectric sensor film are disposed on different layers of piezoelectric film on the common substrate. 10. The hard disk drive of claim 8, wherein the at least one piezoelectric actuator film and the at least one piezoelectric sensor film comprise coplanar piezoelectric films disposed on the common substrate. 11. The hard disk drive of claim 8, wherein the at least one piezoelectric actuator film and the at least one piezoelectric sensor film are disposed in a common layer of piezoelectric film on the common substrate. 12. The hard disk drive of claim 1, wherein the piezoelectric actuator element comprises a first thin-film piezoelectric actuator film and a second thin-film piezoelectric actuator film. 13. The hard disk drive of claim 12, wherein the first thin-film piezoelectric actuator film and the second thin-film piezoelectric actuator film comprise coplanar layers of piezoelectric material disposed on the common substrate. 14. The hard disk drive of claim 12, wherein the first thin-film piezoelectric actuator film and the second thin-film piezoelectric actuator film are disposed in a common layer of piezoelectric material on the common substrate. 15. The hard disk drive of claim 12, wherein the first thin-film piezoelectric actuator film and the second thin-film piezoelectric actuator film are disposed in different layers of piezoelectric material on the common substrate. 16. The hard disk drive of claim 1, wherein the processor is operable to control the piezoelectric actuator element based upon a sensor signal received from the piezoelectric sensor element via the sensor signal line. 17. The hard disk drive of claim 1, wherein the processor is operable to determine if a shock imparted to the disk drive. 18. The hard disk drive of claim 17, wherein the processor is operable to interrupt an operation of the disk drive if the shock meets a predetermined threshold. 19. The hard disk drive of claim 18, wherein the operation comprises at least one of a write operation and a read operation. 20. The hard disk drive of claim 1, wherein the vibration comprises at least one of air turbulence excited vibration and resonant modes of vibration. 21. The hard disk drive of claim 1, wherein the processor is operable to actively control the vibration. 22. The hard disk drive of claim 21, wherein the processor is operable to compensate for the vibration. 23. The hard disk drive of claim 22, wherein the processor is operable to compensate for the vibration by modifying a position control signal with a vibration control signal. 24. The hard disk drive of claim 23, wherein the processor determines the vibration control signal based upon a sensor signal received via the sensor signal line. 25. The hard disk drive of claim 23, wherein the position control signal comprises a position control signal for at least one of a voice coil motor and the piezoelectric actuator element. 26. The hard disk drive of claim 1, wherein the piezoelectric actuator element is electrically interconnected to the actuator signal line via a charge driver circuit. 27. A method for detecting a vibration in a hard disk drive actuator assembly, the method comprising: sending an actuation signal over a first signal line to control at least a first piezoelectric actuator element located on a first substrate for positioning a transducer head of a disk drive with respect to a disk of the disk drive; receiving a sensor signal over a second signal line from at least a first piezoelectric sensor element located on said first substrate, wherein the at least a first piezoelectric sensor element is collocated with and electrically isolated from the at least a first piezoelectric actuator element; determining, using the sensor signal, whether a vibration has been detected by the piezoelectric sensor element. 28. The method of claim 27, wherein the at least a first piezoelectric actuator element comprises a pair of piezoelectric actuator films. 29. The method of claim 27, wherein the at least a first piezoelectric sensor element comprises a pair of piezoelectric sensor films. 30. The method of claim 29, further comprising processing a first sensor signal produced by a first piezoelectric sensor of the pair of sensors and a second sensor signal produced by a second piezoelectric sensor of the pair of sensors to provide a differential sensor signal. 31. The method of claim 30, wherein the processing of the first and second sensor signals comprises subtracting the first sensor signal of a first piezoelectric sensor film from the second sensor signal of a second piezoelectric sensor film. 32. The method of claim 31, further comprising sending the differential signal over the second signal line. 33. The method of claim 30, wherein the step of processing results in a differential sensor signal corresponding to in-plane vibration of the actuator assembly. 34. The method of claim 30, wherein the step of processing comprises providing the differential sensor signal substantially void of out-of-plane vibration of the actuator assembly. 35. The method of claim 31, further comprising using a differential amplifier to subtract the first sensor signal from the second sensor signal and amplifying the resulting signal to obtain the differential sensor signal. 36. The method of claim 27, wherein controlling the at least a first piezoelectric actuator element comprises sending the actuation signal to a charge drive circuit. 37. The method of claim 27, wherein the vibration comprises a shock. 38. The method of claim 37, further comprising aborting a disk access operation upon a determination that a vibration has been detected. 39. The method of claim 27, wherein the operation of determining whether a vibration has been detected comprises comparing the sensor signal to a predetermined threshold. 40. The method of claim 27, further comprising modifying the actuation signal to compensate for the position of the transducer head with respect to the disk upon a determination that a vibration has been detected. 41. The method of claim 40, further comprising determining a position error signal utilizing the sensor signal. 42. The method of claim 27, further comprising determining a vibration control signal based upon the sensor signal. 43. The method of claim 42, further comprising modifying the actuation signal to compensate for the position of the head with respect to the disk based upon the vibration control signal. 44. The method of claim 43, wherein modifying the actuation signal comprises adding the vibration control signal to the actuation signal. 45. The method of claim 43, wherein modifying the actuation signal comprises subtracting the vibration control signal from the actuation signal. 46. The method of claim 43, further comprising providing the modified actuation signal to a current drive circuit to control a voice coil motor. 47. The method of claim 43, further comprising providing the modified actuation signal to a charge drive circuit to control the piezoelectric actuator element. 48. A hard disk drive comprising: means for storing data comprising at least one disk rotatable about an axis; means for reading data from and writing data to the means for storing data; means for moving and for placing the means for reading data from and writing data to the disk in a selected location relative to a surface of the means for storing data including piezoelectric actuator means for effecting movement; means for sensing a vibration comprising piezoelectric sensor means, wherein the piezoelectric actuator means and the piezoelectric sensor means are collocated on a single substrate; means for processing and generating control signals; first means for electrically interconnecting the means for processing and generating control signals to the piezoelectric sensor means; and second means for electrically interconnecting the means for processing and generating control signals to the piezoelectric actuator means, wherein the first and second means are electrically isolated from each other. 49. A method of making a data storage actuator assembly, comprising: providing an actuator comprising: a first portion; a second portion; and a data read/write element mounted to the second portion; forming a piezoelectric actuator element on a first substrate; forming a piezoelectric sensor element on said first substrate, wherein the piezoelectric actuator element is electrically isolated from the piezoelectric sensor element; and mounting the first substrate to the actuator, such that the piezoelectric actuator element is configured to move the second portion relative to the first portion. 50. The method of claim 49, wherein the piezoelectric actuator element comprises first and second thin-film piezoelectric actuator elements, the method further comprising positioning the first and second thin-film piezoelectric actuator elements on the first substrate. 51. The method of claim 50, wherein positioning the first and second thin-film piezoelectric actuator elements on the first substrate comprises positioning the first and second thin-film piezoelectric actuator elements in a coplanar relationship. 52. The method of claim 50, wherein positioning the first and second thin-film piezoelectric actuator elements on the first substrate comprises depositing the first and second thin-film piezoelectric actuator elements on the first substrate as a single film layer. 53. The method of claim 50, further comprising electrically isolating the first and second thin-film piezoelectric actuator elements via an isolation barrier. 54. The method of claim 50, further comprising electrically isolating the first and second thin-film piezoelectric actuator elements on different layers on the first substrate. 55. The method of claim 49, wherein the piezoelectric actuator element and the piezoelectric sensor element comprise a single layer of piezoelectric film and wherein the piezoelectric actuator element and the piezoelectric sensor element are electrically isolated from one another by etching the single layer of piezoelectric film. 56. The method of claim 49, wherein the piezoelectric actuator element and the piezoelectric sensor element are electrically isolated from one another by placing an isolation barrier between the piezoelectric actuator element and the piezoelectric sensor element. 57. A data storage actuator assembly, comprising: an actuator, comprising: a first portion; a second portion, and a data read/write element mounted to the second portion; and a piezoelectric actuator and sensor assembly, comprising: a first substrate mounted to the actuator; a piezoelectric actuator element disposed on the first substrate and configured to move the second portion relative to the first portion; a piezoelectric sensor element disposed on the first substrate, wherein the piezoelectric actuator element and the piezoelectric sensor element are electrically isolated; an actuation signal line interconnected to the piezoelectric actuator element; and a sensor signal line interconnected to the piezoelectric sensor element. 58. The assembly of claim 57, wherein the piezoelectric actuator element includes a pair of piezoelectric sensor films. 59. The assembly of claim 57, wherein the piezoelectric sensor element includes a pair of piezoelectric sensor films.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (9)
Henze Richard H., Disk drive and method for minimizing shock-induced damage.
Hyde, Roderick A.; Myhrvold, Nathan P.; Wood, Jr., Lowell L.; Chan, Alistair K.; Tegreene, Clarence T., Active control of a body by altering surface drag.
Gamble, Eric T.; Green, Kenton C.; Jones, Carl E.; Louie, Timothy J M; Peavler, Robert D.; Verburg, David A., Hard disk drive availability following transient vibration.
Shelor, John R., Rotational, shear mode, piezoelectric motor integrated into a collocated, rotational, shear mode, piezoelectric micro-actuated suspension, head or head/gimbal assembly for improved tracking in disk drives and disk drive equipment.
Hyde, Roderick A.; Myhrvold, Nathan P.; Wood, Jr., Lowell L.; Chan, Alistair K.; Tegreene, Clarence T., System for changing the convective heat transfer coefficient for a surface.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.