Andre Chan resumes & CV records
Resumes
Special Advisor
Work:
China State Construction Engrg. Corp. (Middle East) (L.l.c.)
Special Advisor Msce
General Manager
Special Advisor Msce
General Manager
Andre C Chan, 31Walnut Creek, CA
Andre Chan Phones & Addresses
Walnut Creek, CA
Hayward, CA
1784 Magnolia Cir, Pleasanton, CA 94566 925-4625362
La Jolla, CA
Mentions for Andre C Chan
Publications & IP owners
Us Patents
Aerodynamic Diffuser, Contraction, And Fairing For Disk Base And Re-Acceleration Drag Reduction In Hard Disk Drives
US Patent:
7123439, Oct 17, 2006
Filed:
Aug 20, 2003
Appl. No.:
10/644706
Inventors:
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 33/14
US Classification:
360 9702, 360 9703
Abstract:
A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to the disks. The device gradually expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks. The device has a comb-like structure that is offset slightly from the spinning disk pack in the radial direction. The structure fulfills an aerodynamic function, reduces track misregistration, lowers overall aerodynamic dissipation and fulfills a filtration function.
System And Method For Hard Disk Drive With Disk Clamp Annular Rim Inner Wall Engaging Hub Annular Recess Outer Wall
US Patent:
7126787, Oct 24, 2006
Filed:
Jun 22, 2005
Appl. No.:
11/158485
Inventors:
Andre Sirilutporn Chan - Milpitas CA, US
Ta-Chang Fu - San Jose CA, US
Andrew Keith Hanlon - San Jose CA, US
Steven Alf Hanssen - San Jose CA, US
Tisha Jefferson - Lynchburg VA, US
Kunihiro Shida - San Jose CA, US
Stanley Yen Wong - San Jose CA, US
Ta-Chang Fu - San Jose CA, US
Andrew Keith Hanlon - San Jose CA, US
Steven Alf Hanssen - San Jose CA, US
Tisha Jefferson - Lynchburg VA, US
Kunihiro Shida - San Jose CA, US
Stanley Yen Wong - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 17/028
G11B 17/038
G11B 17/038
US Classification:
360 9912, 360 9808
Abstract:
A disk clamp for securing data storage disks to the hub of a spindle motor in a hard disk drive has a circumferential rib protruding from a lower surface of the disk clamp. A complementary recess is formed in the hub of the spindle motor for closely receiving the rib on the disk clamp. The inner diameter of the rib and the outer diameter of the recess are closely toleranced to provide a very precise centering feature for mounting and aligning the disk clamp with respect to the hub and spindle motor. This design reduces the complexity of the tooling and fixtures required to complete the assembly and the overall part cost is reduced.
Hard Disk Drive With Aerodynamic Diffuser, Contraction, And Fairing For Disk Base And Re-Acceleration Drag Reduction
US Patent:
7158342, Jan 2, 2007
Filed:
Aug 20, 2003
Appl. No.:
10/644172
Inventors:
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands BV - Amsterdam
International Classification:
G11B 33/14
US Classification:
360 9702
Abstract:
A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. The device gradually expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks. The device has a comb-like structure that is offset from the disk pack in the radial direction. The structure fulfills an aerodynamic function, reduces track misregistration, lowers overall aerodynamic dissipation, and fulfills a filtration function.
System, Method, And Apparatus For Applying Boundary Layer Manipulation Techniques To The Air Flow Inside Rotary Disk Storage Devices
US Patent:
7177116, Feb 13, 2007
Filed:
Mar 3, 2004
Appl. No.:
10/792567
Inventors:
Juan Jose Alonso - Stanford CA, US
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands BV - Amsterdam
International Classification:
G11B 33/14
US Classification:
360 9702, 360 9701, 360 9703, 360 9704, 720648, 720651
Abstract:
A system, method, and apparatus for solving flow-induced track misregistration (TMR) problems in hard disk drives (HDD). Boundary layer manipulation techniques are applied to the airflow in the HDD, such as boundary layer suction with slots or holes, and wall damping techniques, such as an open honeycomb seal and Helmholtz resonators. These flow-conditioning solutions reduce the turbulence intensity throughout the HDD to reduce TMR. These solutions achieve these goals while minimizing increases in the running torque needed to overcome their inherent rotational drag.
System, Method, And Apparatus For Aerodynamic Diverter Integrated With A Diffuser In A Bypass Channel For Applications In A Disk Storage Device
US Patent:
7203030, Apr 10, 2007
Filed:
Mar 29, 2004
Appl. No.:
10/811682
Inventors:
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Michael Robert Hatchett - San Jose CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Michael Robert Hatchett - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 33/14
US Classification:
360 9702, 360 9703
Abstract:
A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. A diverter portion of the device enhances the volumetric flow of air through the diffuser. The overall function of the device effectively expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks.
System, Method, And Apparatus For Distributing Stress With One Or More Cavities In A Disk Clamp For Disk Drive Applications
US Patent:
7239476, Jul 3, 2007
Filed:
May 12, 2004
Appl. No.:
10/843725
Inventors:
Andre Sirilutporn Chan - Milpitas CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands B.V. - Amsterdam
International Classification:
G11B 17/08
US Classification:
360 9808
Abstract:
A disk clamp for securing data storage disks to the hub of a spindle motor in a hard disk drive has a stress distributing cavity to reduce the stress concentration on disk under the screw locations. The cavity may comprise a single, completely circumferential annular slot located in the perimeter side wall of the clamp, or a series of smaller cavities that are angularly aligned with each screw in the perimeter of the clamp. In the case of adding a series of small stress distribution cavities, the load distribution is modulated to higher harmonic components, thus reducing the peak-to-valley value of reaction force on the contact ring by about 20% to 50%.
System, Method, And Apparatus For Breaking Up Large-Scale Eddies And Straightening Air Flow Inside Rotary Disk Storage Devices
US Patent:
7324302, Jan 29, 2008
Filed:
Mar 3, 2004
Appl. No.:
10/792566
Inventors:
Juan Jose Alonso - Stanford CA, US
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands BV - Amsterdam
International Classification:
G11B 33/14
G11B 17/02
G11B 17/02
US Classification:
360 9702
Abstract:
A system, method, and apparatus for solving flow-induced track misregistration (TMR) problems in hard disk drives (HDD) are directed to breaking up large-scale eddies, and straightening air flows with honeycomb structures, woven wire screens, and guide vanes or holes. In addition, boundary layer manipulation techniques are applied to the airflow in the HDD, such as boundary layer suction with slots or holes, and wall damping techniques, such as an open honeycomb seal and Helmholtz resonators. These flow-conditioning solutions reduce the turbulence intensity throughout the HDD to reduce TMR. These solutions achieve these goals while minimizing increases in the running torque needed to overcome their inherent rotational drag.
Aerodynamic Diverter Integrated With A Diffuser And A Contraction In A Bypass Channel For A Disk Storage Device
US Patent:
7405904, Jul 29, 2008
Filed:
Feb 26, 2007
Appl. No.:
11/678875
Inventors:
Andre Sirilutporn Chan - Milpitas CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Michael Robert Hatchett - San Jose CA, US
Ferdinand Hendriks - Morgan Hill CA, US
Michael Robert Hatchett - San Jose CA, US
Assignee:
Hitachi Global Storage Technologies Netherlands BV - Amsterdam
International Classification:
G11B 33/14
US Classification:
360 9702, 360 9703
Abstract:
A device streamlines air flow inside a hard disk drive with a stationary afterbody that is located adjacent to each of the disks. A diverter portion of the device enhances the volumetric flow of air through a diffuser and a contraction. The overall function of the device effectively expands the air flow so that the speed of the air flow gradually decreases while pressure increases. This design reduces losses in system momentum due to sudden expansion of the air in the drive. In addition, air flow moving toward the disk pack may be contracted to allow efficient energy conversion from pressure energy to kinetic energy prior to merging of the bypass air flow with the air flow among the disks.
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