Hyung June Lee

US Patent:

6411468, Jun 25, 2002

Filed:

Jan 21, 2000

Appl. No.:

09/489014

Inventors:

Hyung Jai Lee - Cupertino CA

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

G11B 560

US Classification:

3602363

Abstract:

A air bearing slider that flies above a surface of a recording disk during relative rotation of the recording disk. A plurality of projections extend along the side of the slider body, and a plurality of negative pressure air cavities are formed between the projections. The projections act as pneumatic bearings, creating supporting positive forces for supporting the slider. The negative pressure air cavities create negative forces for pulling the slider down. The positive and negative forces on the center of mass of the slider are balanced to provide a more stable, static, and dynamic flying attitude for the slider. The resulting pressure profile of the slider has high pressure near the leading end, relatively low pressure in the middle, and relatively high pressure near the trailing end. This ensures that the minimum spacing between the slider of the disk is very insensitive to roll parameters.

US Patent:

6489762, Dec 3, 2002

Filed:

Apr 26, 2001

Appl. No.:

09/844897

Inventors:

Geng Wang - San Jose CA
Zhaohui Li - Santa Clara CA
Hyung Jai Lee - Cupertino CA

Assignee:

Samsung Electronics Co., Ltd.

International Classification:

G01R 3312

US Classification:

324210

Abstract:

A method to test an instability of a magneto-resistive (MR) head. The instability is tested by first writing a signal onto a track. The junctions of the MR head are aligned with various track edges and the head characteristics are then measured. The characteristics may include determining a maximum amplitude covarian and a maximum base line popping noise.

US Patent:

6593736, Jul 15, 2003

Filed:

Feb 11, 2002

Appl. No.:

10/074614

Inventors:

Eun Kyu Jang - San Jose CA 95134
Hyung Jai Lee - San Jose CA 95134

International Classification:

G01R 3312

US Classification:

324210, 2960308, 2960309, 360317

Abstract:

The invention includes a method and apparatus repairing read heads of a merged magnetoresistive read-write head without the use of external magnets nor the exclusive use of read bias current to heat the read head.

US Patent:

6710594, Mar 23, 2004

Filed:

Mar 20, 2002

Appl. No.:

10/103485

Inventors:

Hyung Jai Lee - Cupertino CA

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

G01R 3312

US Classification:

324210, 2960301, 2960303, 360 31, 324537, 324656

Abstract:

A test system and method determining performance of a merged magnetoresistive read-write head based upon operating the write inductive head of the merged read-write head, measuring the resistance of the read head under certain read current bias conditions and finding which read heads have been damaged by ESD.

US Patent:

6747843, Jun 8, 2004

Filed:

Mar 26, 2002

Appl. No.:

10/107387

Inventors:

Vinod Sharma - Los Gatos CA
Joseph Chang - Cupertino CA
Hyung Jai Lee - San Jose CA

Assignee:

Samsung Electronics Co., LTD - Suwon

International Classification:

G11B 554

US Classification:

360128, 3602544

Abstract:

The invention includes a method of A wipping part of the load ramp is a convex finger crossing the read-write head path of motion with respect to a lifting tab engagably moving across the loading ramp.

US Patent:

6753103, Jun 22, 2004

Filed:

Oct 4, 2002

Appl. No.:

10/264394

Inventors:

Sooyoul Hong - Sunnyvale CA
Daehoon Hong - Daejeon, KR
Taekdong Lee - Seoul, KR
Hyung J. Lee - Cupertino CA

Assignee:

Samsung Electronics Co. Ltd.

International Classification:

G11B 566

US Classification:

428694TM, 428694 TS, 428611, 428660, 428681, 428900, 427128, 427131

Abstract:

A disk for a hard disk drive. The disk includes a first layer of magnetic material located over a substrate, an intermediate layer located over the first magnetic layer and a second layer of magnetic material located over the intermediate layer. The second layer may include cobalt and chromium. The intermediate layer may include titanium. The first magnetic layer include iron, hafnium and nitrogen (FeHfN). This composition of the first magnetic layer shows higher saturation magnetization and lower roughness, and increases the nucleation field of the disk.

US Patent:

6821027, Nov 23, 2004

Filed:

Oct 30, 2002

Appl. No.:

10/284629

Inventors:

Hyung Jae Lee - Sunnyvale CA
Yong-Sung Jin - Sunnyvale CA
Yung-Sung Son - Sunnyvale CA

Assignee:

OPTI Japan Corporation - Tokyo

International Classification:

G02B 643

US Classification:

385 89, 385 92, 385 94

Abstract:

The present invention relates to a module for parallel transmission and reception of an optical signals, and particularly a miniaturized module with a fixed optical coupler and a detachable electric connector is disclosed. A miniaturized optical signal transmission module according to the present invention comprises an electrical connector for coupling electric signals to a circuit board; an array of optical devices coupled to metal leads, the array of optical devices converting between optical signals and the electric signals; an optical fiber array block fixedly and optically coupled to the array of optical devices for transmitting the optical signals, wherein the metal leads are detachably coupled to the electrical connector part. The optical module can be miniaturized so that the entire system can be miniaturized. Accordingly, many advantages according to the miniaturization of the entire system can be obtained.

US Patent:

6950282, Sep 27, 2005

Filed:

Oct 7, 1998

Appl. No.:

09/167861

Inventors:

Pyongwon Yim - Sunnyvale CA, US
Hae Sung Kwon - Sunnyvale CA, US
Tho Pham - Milpitas CA, US
Hyung J. Lee - Cupertino CA, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon

International Classification:

G11B005/48

US Classification:

3602455

Abstract:

A hard disk drive assembly that includes a device for limiting a movement of a head of a head gimbal assembly from a surface of a disk. The head is coupled to the disk and attached to a suspension of the head gimbal assembly. The invented device limits a distance that the head can move away from a surface of the disk. Limiting the distance that the head can move away from the surface of the disk, may reduce the impact force associated with the head slapping the disk, which may reduce damage associated with head slapping.

Author:

Hyung Jae Lee

ISBN #:

3527405704

Author:

Hyung Gyun Lee

ISBN #:

3631325738