Source: http://www.google.com/patents/US6002549?dq=7,603,356
Timestamp: 2013-12-12 12:13:57
Document Index: 349407734

Matched Legal Cases: ['application No. 08', 'Application No. 60', 'application No. 08', 'Application No. 60', 'application No. 08', 'Application No. 60']

Patent US6002549 - Dither microactors for stiction release in magnetic disc drives - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA disc drive has rotatable recording disc and a transducing head on a slider arranged to fly over a surface of the disc when the disc is rotated. The slider is supported by an actuator arm operatively coupled to an actuator motor to position the transducing head over a selected track of the disc. The...http://www.google.com/patents/US6002549?utm_source=gb-gplus-sharePatent US6002549 - Dither microactors for stiction release in magnetic disc drivesPublication numberUS6002549 APublication typeGrantApplication numberUS 08/866,984Publication dateDec 14, 1999Filing dateJun 2, 1997Priority dateNov 1, 1996Fee statusLapsedPublication number08866984, 866984, US 6002549 A, US 6002549A, US-A-6002549, US6002549 A, US6002549AInventorsAlan David Berman, Zine-Eddine Boutaghou, Anoush Mahabadi Fard, Khosrow Mohajerani, Joseph Michael SampietroOriginal AssigneeSeagate Technology, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (29), Non-Patent Citations (14), Referenced by (42), Classifications (45), Legal Events (16) External Links: USPTO, USPTO Assignment, EspacenetDither microactors for stiction release in magnetic disc drivesUS 6002549 AAbstract A disc drive has rotatable recording disc and a transducing head on a slider arranged to fly over a surface of the disc when the disc is rotated. The slider is supported by an actuator arm operatively coupled to an actuator motor to position the transducing head over a selected track of the disc. The slider is arranged to land on the disc surface when the disc is not rotated. Dithering means vibrates the slider when the slider is on the disc surface to reduce stiction between the slider and the disc surface thereby reducing the torque required to commence flying of the slider.
What is claimed is: 1. A disc drive having rotatable recording disc and an actuator arm system that includes a transducing head on a slider arranged to fly over a surface of the disc when the disc is rotated, a motor coupled to the actuator arm system to position the transducing head over a selected track of the disc, the slider being arranged to land on the disc surface when the disc is not rotated, the disc drive including dithering means supported on the actuator arm system for vibrating the slider in a direction generally radially across the disc when the slider is on the disc surface to reduce stiction between the slider and the disc surface.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of application No. 08/836,292 filed May 12, 1997, which is a 371 application of PCT/US97/07892 filed May 12, 1997, which claims priority of U.S. Provisional Application No. 60/030,406 filed Nov. 1, 1996. This application is also a continuation-in-part of application No. 08/836,466 filed May 5, 1997, which is a 371 application of PCT/US97/07710 filed May 5, 1997, which in turn claims the benefit of U.S. Provisional Application No. 60/030,276 filed Nov. 4, 1996. This application is also a continuation-in-part of application No. 08/852,087 filed May 7, 1997, which claims the benefit of U.S. Provisional Application No. 60/032,348 filed Dec. 4, 1996, and also claims the benefit of U.S. Provisional No. 60/031,578 filed Dec. 5, 1996. All of the applications are assigned to the same assignee as the present application.
BACKGROUND OF THE INVENTION This invention relates to stiction reduction in a magnetic disc drive, and particularly to the use of microvibration in an actuator arm of a disc drive to reduce stiction.
SUMMARY OF THE INVENTION According to an embodiment of the present invention, a disc drive has rotatable recording disc and a transducing head on a slider arranged to fly over a surface of the disc when the disc is rotated. The slider is supported by an actuator arm operatively coupled to an actuator motor to position the transducing head over a selected track of the disc. The slider is arranged to land on the disc surface when the disc is not rotated. Dithering means vibrates the slider when the slider is on the disc surface to reduce stiction between the slider and the disc surface thereby reducing the torque required to commence flying of the slider.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of an actuator arm having a dithering unit according to a first embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a top view, and FIG. 2 is a side view, of an actuator arm assembly employing a dithering unit according to a first embodiment of the present invention. A voice coil motor 12 is operable to rotate actuator arms 16 of an E-block about axis 14 of spindle 17. Threaded fastener 15 fastens the hub of actuator arms 16 to actuator arm spindle 17. Load beam 18 is connected to a distal end of actuator arm 16 by load beam mounting block 20. Gimbal 22 is attached to a distal end of head suspension 18. Slider 24 is mounted to gimbal 22 in a manner known in the art. Voice coil motor 12 is operatively attached to the E-block for rotating actuator arms 16 of the E-block to position slider 24 adjacent a selected track 34 on disc 30. Each actuator arm 16 is rotatable around axis 14 in response to operation of voice coil motor 12, and has a longitudinal axis 25 normal to axis 14. Each actuator arm 16 includes a space 19 forming arm side portions 21a and 21b on each side of longitudinal axis 25. Voice coil motor 12, actuator arms 16, load beam 18, load beam mounting block 20, gimbal 22, and slider 24 are all standard disc drive system components, manufactured in a manner known in the art.
As shown particularly in FIG. 1, a power supply 40 provides a voltage to terminals 27a and 27b to selectively operate piezoelectric element 26. In one preferred form of the invention, power source 40 provides a voltage of between .+-.5 volts varying at a frequency between about 1 and 30,000 Hz. The .+-.5 volt input provides expansion/contraction of approximately 3.05 μm in piezoelectric element 26 at the frequency of supply 40. Preferably, the frequency of supply 40 is selected such that resonance is established at the slider 24.
In a first series of tests, the static stiction (that is, the stiction without any vibration actuation according to the present invention) at the landing zone was measured by permitting the slider to rest in contact with the landing zone of the disc surface for a period of 30 minutes. The spindle motor was operated, without applying any signal to the piezoelectric element, to overcome stiction between the disc and the slider and achieve rotation of the disc. The torque required to achieve operational rotation of the disc was 0.22 in-oz. The slider was then landed in the landing zone and an alternating signal of .+-.5 volts was applied to the piezoelectric element 26 at various frequencies and after various durations of rest in the landing zone. The torque required to overcome stiction and achieve rotation of the disc was recorded and is tabulated in Table I.
In a second series of tests, the static stiction at the data zone was measured by permitting the slider to rest in contact with the data zone of the disc surface for a period of 30 minutes at a radius of 1.25 inches on the disc surface. The spindle motor was operated, without applying any signal to the piezoelectric element, to overcome stiction between the disc and the slider and achieve rotation of the disc. The torque required to achieve operational rotation of the disc was 0.35 in-oz. The slider was then landed in the data zone at a radius of about 1.25 inches on the disc and an alternating signal of .+-.5 volts was applied to the piezoelectric element 26 at various frequencies and after various durations of rest in the landing zone. The torque required to overcome stiction and achieve rotation of the disc was recorded and is tabulated in Table II.
In a third series of tests, the static stiction at an outside radius of the data zone was measured by permitting the slider to rest in contact with the disc surface for a period of 30 minutes at a radius of 1.80 inches. The spindle motor was operated, without applying any signal to the piezoelectric element, to overcome stiction between the disc and the slider and achieve rotation of the disc. The torque required to achieve operational rotation of the disc was 0.75 in-oz. The slider was then landed in the data zone at a radius of about 1.80 inches on the disc and an alternating signal of .+-.5 volts was applied to the piezoelectric element 26 at various frequencies and after various durations of rest in the landing zone. The torque required to overcome stiction and achieve rotation of the disc was recorded and is tabulated in Table III.
A second ST52520 disc drive manufactured by Seagate Technology, Inc. of Scotts Valley, Calif., was configured as described above with a single piezoelectric device 26 in each actuator arm in accordance with the embodiment of FIG. 1. Static stiction was measured, as described above, for four conditions: With no sliders (no sliders in contact with the disc surfaces to thereby measure the torque necessary to achieve operational rotation of the spindle motor due solely to the motor) the torque required to achieve operational rotation of the spindle motor was 0.13 in-oz. With the heads landed at the landing zone, the torque required to achieve operational rotation of the spindle motor was 0.33 in-oz. With the heads landed in the middle of the data zone at a radius of 1.25 inches, the torque required to achieve operational rotation of the spindle motor was 0.70 in-oz. With the heads landed at the outer radius of the data zone at a radius of 1.80 inches, the torque required to achieve operational rotation of the spindle motor was 0.90 in-oz. The slider was then landed at each of the three locations and an alternating signal of .+-.5 volts was applied to the piezoelectric elements at various frequencies. The torque required to overcome stiction and achieve operational rotation of the discs was recorded and is tabulated in Table IV.
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LauerElectromagnetic heads, flexures, gimbals and actuators formed on and from a wafer substrateWO2002043063A1 *Nov 23, 2000May 30, 2002Sae Magnetics Hk LtdRotary piezoelectric microactuator with an optimum suspension arrangementWO2003041062A1 *Nov 3, 2001May 15, 2003Sae Magnetics Hk LtdMethod and apparatus for improved attachment of a micro-actuator to a slider device* Cited by examinerClassifications U.S. Classification360/294.4, G9B/21.28, G9B/21.15, G9B/5.181, G9B/5.78, G9B/5.79, G9B/5.94, G9B/5.193, G9B/5.82, 360/75International ClassificationG11B5/39, G11B5/54, G11B21/08, G11B5/55, G11B5/31, B24B49/16, G11B21/24, G11B5/187Cooperative ClassificationG11B5/5552, G11B5/3173, G11B5/3103, G11B5/3116, G11B5/3106, G11B5/1871, G11B21/085, G11B5/54, B24B37/048, G11B5/3169, G11B5/398, G11B21/24, G11B5/3967, G11B5/3163, B24B49/16European ClassificationB24B37/04F, G11B5/31M3, G11B5/31M5, G11B21/08A1F, G11B5/31D4, B24B49/16, G11B5/55D2, G11B5/31B, G11B5/31B1, G11B21/24, G11B5/54, G11B5/31MLegal EventsDateCodeEventDescriptionJul 19, 2013ASAssignmentEffective date: 20130312Owner name: SEAGATE TECHNOLOGY LLC, CALIFORNIAOwner name: SEAGATE TECHNOLOGY INTERNATIONAL, CAYMAN ISLANDSFree format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENT RIGHTS;ASSIGNOR:WELLS FARGO BANK, NATIONAL ASSOCIATION, AS COLLATERAL AGENT AND SECOND PRIORITY REPRESENTATIVE;REEL/FRAME:030833/0001Owner name: EVAULT INC. 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