John M Tsai

US Patent:

6522604, Feb 18, 2003

Filed:

May 15, 2001

Appl. No.:

09/858780

Inventors:

John C. Tsai - Saratoga CA

Assignee:

Excel Precision Corporation - Santa Clara CA

International Classification:

G11B 1100

US Classification:

369 1324, 3692753, 369 4426

Abstract:

Apparatus ( ) and method ( ) for inscribing a clock pattern ( ), detecting the clock pattern ( ) optically, and using the clock pattern ( ) to write a sevo pattern in an information storage unit ( ), such as a computer hard drive. The clock pattern ( ) is inscribed using a marking system ( ), which may include a laser ( ) or employ other, even non-optical, methods. The clock pattern ( ) is inscribable into various locations on a disk platter ( ) inside the storage unit ( ), including many outside the media surface ( ) conventionally used for such in data storage units. While the disk platter ( ). is rotating, the clock pattern ( ) is on detected using an detection subsystem ( ), if desired through a transparent window ( ) in a hermetically sealed housing ( ) of the storage unit ( ), for use in writing the servo pattern with less sector-inconsistency error and off-track error.

US Patent:

6561420, May 13, 2003

Filed:

Apr 10, 2001

Appl. No.:

09/835961

Inventors:

Erica Tsai - Saratoga CA 95070
John C. Tsai - Saratoga CA 95070

International Classification:

G06K 708

US Classification:

235449, 235380, 235379, 235493

Abstract:

A data distribution system ( ) including an information card ( ) and a reader ( ). The information card ( ) includes visible indicia ( ) on its front and stripe zones ( ) and a ring zone ( ) on its back. The zones ( ) are suitable for magnetically recording data, and optional data identifiers. The reader ( ) may be a linear reader ( ) or a rotary reader ( ), and optionally may act automatically in response to reading a data identifier. If the reader ( ) is a rotary reader ( ) the information card ( ) may be loaded into a cartridge ( ) which is loaded into the rotary reader ( ).

US Patent:

6603629, Aug 5, 2003

Filed:

Jul 22, 1998

Appl. No.:

09/121177

Inventors:

John C. Tsai - Saratoga CA

Assignee:

Excel Precision, Inc. - Santa Clara CA

International Classification:

G11B 2110

US Classification:

360 7703

Abstract:

A servo track writing apparatus ( ) for writing servo tracks ( ) on a media disk ( ) of a disk drive assembly ( ) having a Positioning arm ( ) with a through hole ( ) therein. The writing apparatus ( ) has a laser source ( ) which directs a source beam ( ) through a polarizing beam splitter ( ) and a quarter-wave plate ( ) to either pass through the through hole ( ) and reflect off of the media disk ( ) as a reflected beam ( ), or to be reflected from regions of the positioning arm ( ) proximate to the through hole ( ) as a reflected beam ( ). The writing apparatus ( ) further has a remote tracking arm ( ) with two photodiodes ( ) suitably mounted thereon to receive the reflected beams ( ). The tracking arm (42) is caused by a motive means ( ) to precisely track the positioning arm ( ) of the disk drive assembly ( ). A laser interferometer ( ) is then used to detect an optical target (60) mounted on the tracking arm ( ) and determine positioning for writing of the servo track ( ).

US Patent:

6718092, Apr 6, 2004

Filed:

May 9, 2002

Appl. No.:

10/143362

Inventors:

David W. Wang - Saratoga CA
John C. Tsai - Saratoga CA

Assignee:

Fibera, Inc. - Santa Clara CA

International Classification:

G02B 634

US Classification:

385 37

Abstract:

A frequency processing system for detecting, tuning, or stabilizing light frequency or wavelength in a light beam produced by a light source. A grating block receives the light beam and may produce diffracted beams and a passed beam. The diffracted beams are received by respective detectors which produce measurement signals that are communicated to a processor. The processor then produces control signals that are communicated to the light source where they are usable for detecting, tuning, or stabilizing the light frequency or wavelength. The grating blocks particularly employ planar or cubical gratings, or gradient versions of these, to produce the diffracted beams.

US Patent:

6731659, May 4, 2004

Filed:

Jan 4, 2002

Appl. No.:

10/039276

Inventors:

John C. Tsai - Saratoga CA
David W. Wang - Saratoga CA

Assignee:

Fibera, Inc. - Santa Clara CA

International Classification:

H01S 3098

US Classification:

372 18, 372 32

Abstract:

A frequency locker ( ) for working with external light sources or frequency locked light sources ( ) having integrated laser light sources ( ). The locker ( ) provides multi-channel frequency tuning and stabilization with common components, particularly including common beam splitters ( ), an interferometer ( ), and a processing circuit ( ). The locked light source ( ) integrates a light source ( ) and single channel frequency tuning and stabilization capabilities. The locked light source ( ) integrates multiple instances of the locked light source ( ) within a single housing ( ) to provide multi-channel capability. And the locked light source ( ) provides multi-channel frequency tuning and stabilization with common components, particularly including a single beam splitter ( ), an interferometer ( ), and a processing circuit ( ).

US Patent:

6748138, Jun 8, 2004

Filed:

Sep 14, 2001

Appl. No.:

09/953468

Inventors:

David W. Wang - Saratoga CA
John C. Tsai - Saratoga CA

Assignee:

Fibera, Inc. - Santa Clara CA

International Classification:

G02B 634

US Classification:

385 37

Abstract:

A process ( ) to construct single- and multi-dimensional optical gratings ( ) of interlayers ( ) of differing refractive index, either in or atop a non-fiber substrate material ( ). The optical gratings ( ) may particularly be Bragg type gratings, and thus suitable for receiving a laser beam ( ) and forming there from one or more reflected beam portions ( ) having one or more narrow wavelengths and a passed beam portion ( ) of other wavelengths.

US Patent:

6789738, Sep 14, 2004

Filed:

Feb 21, 2003

Appl. No.:

10/371928

Inventors:

Erica Tsai - Saratoga CA 95070
John C. Tsai - Saratoga CA 95070

International Classification:

G06F 700

US Classification:

235486, 235380, 235493, 235449, 235435, 360131, 360133

Abstract:

A data distribution system ( ) including an information card ( ) and a reader ( ). The information card ( ) includes visible indicia ( ) on its front and stripe zones ( ) and a ring zone ( ) on its back. The zones ( ) are suitable for magnetically recording data, and optional data identifiers. The reader ( ) may be a linear reader ( ) or a rotary reader ( ), and optionally may act automatically in response to reading a data identifier. If the reader ( ) is a rotary reader ( ) the information card ( ) may be loaded into a cartridge ( ) which is loaded into the rotary reader ( ).

US Patent:

6795459, Sep 21, 2004

Filed:

Mar 1, 2001

Appl. No.:

09/798721

Inventors:

John C. Tsai - Saratoga CA

Assignee:

Fibera, Inc. - Santa Clara CA

International Classification:

H01S 310

US Classification:

372 28, 372 2901, 372 29011, 372 29016, 372 2902, 372 32, 372 98, 372101

Abstract:

A light frequency locker ( ) able to accept a light beam ( ) generated by a controllable light source ( ) into a light diverter ( ) and impart to it a transverse displacement characteristic which can be detected in a light detection unit ( ) connected to a processor ( ). The processor ( ) then controls the light source ( ). Optionally, a light diverger ( ) may be provided to enhance angular resolution. The light diverter ( ) and the light diverger ( ) may either transmit or reflect the light. The light diverter ( ) may particularly include a diffraction grating ( ), Fabry-Perot interferometer ( ), multiple slit plate ( ), or an acousto-optical unit ( ).

Address:

900 High School Way APT 2328, Mountain View, CA 94041

Phone:

(925)6990482

VIN:

KMHDH4AE6CU208114

Make:

HYUNDAI

Model:

ELANTRA

Year:

2012