Xiaohong Sun

US Patent:

7057851, Jun 6, 2006

Filed:

Jun 10, 2003

Appl. No.:

10/458784

Inventors:

Xiaohong Sun - Prior Lake MN, US
Lance Thoresen - Burnsville MN, US
Xu Zuo - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 33/14

US Classification:

360 9702

Abstract:

A disc drive includes a housing surrounding a voice coil in a voice coil cavity, and a disc in a disc cavity. The disc has data tracks and an outer diameter. The disc rotates to induce an airflow along the outer diameter. The voice coil actuates an actuator arm in the disc cavity to access the data tracks. An air dam is in the disc cavity upstream of the actuator arm. The airflow includes a straight line tangent airflow portion along a straight edge of a shroud that is free of obstructions and upstream of the air dam. The straight line airflow portion extends from an arc airflow portion around the outer diameter to the voice coil cavity along a straight line path tangent to the outer diameter.

US Patent:

7119993, Oct 10, 2006

Filed:

Nov 14, 2003

Appl. No.:

10/714061

Inventors:

Xu Zuo - Prior Lake MN, US
Xiaohong Sun - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 21/08

US Classification:

3602642

Abstract:

Apparatus and method for damping operational vibration modes of an actuator assembly. The actuator assembly preferably supports a data transducing head adjacent a storage medium in a servo track writing environment. The actuator assembly further supports a circuit assembly comprising circuit board, card or other circuit portion to facilitate electrical communication with the data transducing head. A damping assembly is interposed between the circuit assembly and the actuator assembly to mechanically decouple the circuit assembly from the actuator assembly. Preferably, the damper assembly comprises one or more rigid damper plates and one or more viscoelastic layers therebetween to provide constrain layer damping. As desired, the plates can be provided with progressively larger thickness dimensions in a direction away from the actuator assembly.

US Patent:

7145749, Dec 5, 2006

Filed:

Nov 14, 2003

Appl. No.:

10/713825

Inventors:

Xu Zuo - Prior Lake MN, US
Xiaohong Sun - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 7/00

US Classification:

360 9702

Abstract:

An actuator assembly including a body portion having at least one actuator arm extending therefrom is disclosed. The body portion includes a body damping assembly to control vibration modes of the actuator body. The damping assembly is coupled to the actuator body of a head actuator assembly to control vibration modes of the actuator body to reduce head positioning errors.

US Patent:

7382571, Jun 3, 2008

Filed:

Aug 9, 2004

Appl. No.:

10/914517

Inventors:

Xu Zuo - Prior Lake MN, US
Mark Toffle - St. Louis Park MN, US
Xiaohong Sun - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 33/14
G11B 25/04

US Classification:

360 9702, 360 9703

Abstract:

Various embodiments of the present invention are generally directed to attenuating excitation energy of a rotatable storage medium using one or more plates each having a plurality of parallel channels to buffer fluid flow across an associated medium surface. A preferred embodiment includes a plurality of channels in facing relation to a common surface of a rotatable storage medium. Further included in a preferred embodiment, the plurality of channels are sequentially arranged into a first, second, and third channels with differing sidewall characterizations. In an alternative embodiment, a plurality of storage mediums which are axially aligned have a plurality of channels in facing relation to either a top or bottom surface of a rotatable storage medium.

US Patent:

7430097, Sep 30, 2008

Filed:

Jun 29, 2005

Appl. No.:

11/169436

Inventors:

Xu Zuo - Prior Lake MN, US
Xiaohong Sun - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/55

US Classification:

360266

Abstract:

An actuator assembly is provided comprising a data transfer head moved by an actuator arm in a data storing and retrieving relationship with a data storage medium. Streamwise arranged aerodynamic fluid re-directing and drag-reducing features on a surface of the actuator arm modify frictional forces acting on the arm from a fluid flow created by moving the medium. A method is provided for improving nonrepeatable runnout disturbances in a data storage device by aligning the drag-reducing features of the actuator assembly with a direction of a mean flow direction of the fluid at an outer diameter of the storage medium to divert the fluid flow away from the head gimbal assembly.

US Patent:

7511917, Mar 31, 2009

Filed:

Aug 9, 2004

Appl. No.:

10/914521

Inventors:

Xu Zuo - Prior Lake MN, US
Xiaohong Sun - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 33/14
G11B 25/04

US Classification:

360 9702, 360 9703

Abstract:

A windage management arrangement for attenuating fluid flow disturbances on an actuator and a moving disc, comprising in combination a fluid flow stripper upstream of the actuator and a disc edge damper downstream of the actuator. A method for managing fluid flow created by a rotating disc that is operably disposed adjacent to an actuator, comprising diverting an upstream portion of the fluid flow, with respect to the actuator, away from the actuator; and diverting a downstream portion of the fluid flow, with respect to the actuator, away from a disc edge.

US Patent:

8416535, Apr 9, 2013

Filed:

Jan 15, 2004

Appl. No.:

10/758330

Inventors:

Kurt J. Korkowski - Carver MN, US
Lance L. Thoresen - Burnsville MN, US
Xiaohong Sun - Prior Lake MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 21/08

US Classification:

3602659

Abstract:

An endcap for use on an actuator arm carrying a single head gimbal assembly, the endcap comprising a body, and a shielding feature extending from the body for reducing windage excitation of the head gimbal assembly.

US Patent:

20090073606, Mar 19, 2009

Filed:

Sep 19, 2007

Appl. No.:

11/857914

Inventors:

Xiaohong Sun - Prior Lake MN, US
Lance L. Thoresen - Burnsville MN, US

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 5/012

US Classification:

360 9701

Abstract:

A data storage medium has a spinning outer diameter that generates a flow stream. A hub joins to actuator arms that are separated by a slot. The outer diameter and the flow stream pass through the slot. A support plate projects from the hub into the slot and faces in a direction that is generally transverse to the flow stream. A diverter plate is positioned in the slot upstream of the support plate. The diverter plate diverts the flow stream toward the outer diameter.