Jay F Raley

US Patent:

6937424, Aug 30, 2005

Filed:

May 12, 2003

Appl. No.:

10/436480

Inventors:

Jen-Yuan Chang - San Jose CA, US
Jay Francis Raley - San Jose CA, US

Assignee:

Hitachi Global Storage Technologies Netherlands N.V. - Amsterdam

International Classification:

G11B005/584

US Classification:

360 7704

Abstract:

In one illustrative example, a method for use in reducing Repeatable Run Out (RRO) error in a data storage device involves obtaining an RRO measurement for each track of a limited number of N disk tracks; characterizing the RRO measurement for each track with real and imaginary values by performing a discrete Fourier transform (DFT) calculation on each RRO measurement; performing a least-squares fit on all of the real values to identify a first set of (n+1) coefficients of an nth-order polynomial function which is a function of disk track r and representable in the form A(r)=ar+ar+. . . +ar+a; and performing a least-squares fit on all of the imaginary values to identify a second set of (n+1) coefficients of an nth-order polynomial function which is a function of disk track r and representable in the form B(r)=br+br+. . . +br+b. RRO compensation is performed based on the relation D(r, s)=Σ{A(r)cos(i(s2π/total_sectors))+B(r)sin(i(s2π/total_sectors))} where Dis the estimated RRO error; r is a track number; s is a sector number at track number r; i is an RRO harmonic number; H is a set of harmonics to be compensated; and total_sectors is a total number of sectors along track number r. Advantageously, RRO variations across the disk can be accurately compensated for with use of a small amount of memory.

US Patent:

20090201678, Aug 13, 2009

Filed:

Feb 8, 2008

Appl. No.:

12/028688

Inventors:

Jay F. Raley - San Jose CA, US

International Classification:

F21V 29/00

US Classification:

362235

Abstract:

A packaging structure for an array of semiconductor light sources that provides a heat sink using conduction, convection and radiation of heat. The array, mounted on a base, transfers heat by conduction to a first metal surface slightly spaced apart from a second metal surface. A liquid transfers heat by convection from the first metal surface to the second thereby spreading the heat over both the first and second metal surfaces which can radiate heat to the ambient environment. Where the metal surfaces are cup-shaped, the metal surfaces can form a beam if the light sources are placed near a focal area of a parabolic cup-shaped reflector surface. Optional screw threads allow use in conventional sockets and may house an optional transformer and rectifier.

US Patent:

48635677, Sep 5, 1989

Filed:

May 25, 1988

Appl. No.:

7/198469

Inventors:

Jay F. Raley - San Jose CA

International Classification:

B01D 308

US Classification:

202182

Abstract:

The invention is a fluid distillation apparatus (10) which, in its preferred embodiment, includes a cylindrical portion (12) which mates with an end wall (14) and a bell portion (16) to form an enclosed volume (18) within which evaporization and condensation of a selected fluid may take place. A heat exchange rotor assembly (20) is formed of head conductive material and includes intertwined evaporization and condensation channels (52, 54) in spiral array. A central tunnel (58) provides access for vapor from an evaporization volume (24) to a condensation volume (26) with a pressure gradient provided by an impeller (100) urging such passage. A drum motor (68) rotates the drum (40) to facilitate liquid flow in the heat exchange rotor (20). An impure fluid input port (32) and output ports are provided for purified fluid (34), concentrated brine (36) and degassing purposes (38). The apparatus is a flow process device and is especially adapted for continuous purification, such as water distillation or desalinization.

US Patent:

59787511, Nov 2, 1999

Filed:

Feb 25, 1997

Appl. No.:

8/804991

Inventors:

Donald Dean Pence - San Jose CA
Jay Francis Raley - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G07C 314

US Classification:

702179

Abstract:

A manufacturing test method and apparatus for testing devices, preferably magnetic disk drives, assembled or processed at ones of a plurality of stations in a variegated process stream from components originating from a plurality of sources of components, to determine failure statistics for selected ones of the plurality of stations or ones of the sources of components. The method comprises establishing a unit history record for each device, the unit history comprising entries for indicating the stations at which the device has been processed and the sources of components specific to the device; detecting the results of selected test/operation processes for devices in the stream; reading the unit history record for the device for which the results were detected to determine a "trace to" stations at which the device has been processed; logging the detected results, by updating a log for each of selected ones of the test/operation process and stations at which a device was processed as determined from the unit history record for the device, with the detected results for the device; calculating at least one "trace to failure" statistic for selected ones of the results and/or stations; updating the unit history record with the results for the device; and comparing the "failure" statistic to an alarm threshold and actuating an alarm if the threshold is exceeded.