Dan C Frusescu

6362452, Mar 26, 2002

Feb 4, 1999

09/244704

Shoji Suzuki - San Jose CA
Dan Frusescu - Santa Clara CA
David Vigdor Salamon - San Jose CA

Komag, Inc. - San Jose CA

B23K 2600

21912169

A method for texturing a substrate comprises rotating the substrate while applying laser pulses thereto. Of importance, the rotational velocity of the substrate is varied during texturing to change the spacing of the resulting laser bumps in accordance with a periodic function. This helps reduce or eliminate vibration in a read-write head after the substrate is formed into a magnetic disk, and the magnetic disk is in use.

62999478, Oct 9, 2001

Jan 20, 1999

9/234448

Shoji Suzuki - San Jose CA
David Treves - Palo Alto CA
David Vigdor Salamon - San Jose CA
Dan Frusescu - Santa Clara CA
Rony Thomas - Kelachandra Chingavanam, IN

Komag, Inc. - San Jose CA

B05D 300

427555

A method in accordance with our invention for providing texture bumps on a substrate comprises the step of forming elliptical ridge-shaped bumps on the substrate. In one embodiment, substrate is used in the manufacture of a magnetic disk used in a disk drive. The elliptical bumps cause less vibration of the read-write head than circular bumps. The elliptical bumps also provide reduced friction between the disk and a read-write head during use.

61641189, Dec 26, 2000

Sep 30, 1998

9/164208

Shoji Suzuki - San Jose CA
Daryl M. Shiraki - San Jose CA
Jayadev P. Patel - San Jose CA
Dan Frusescu - Santa Clara CA
David Treves - Palo Alto CA
Tuan H. Hua - Milpitas CA

Komag Incorporated - San Jose CA

G11B 582

73 189

A calibration disk for calibrating the fly height of a head, includes spaced circumferencial bands on the disk extending in a concentric fashion from adjacent an outer diameter of the disk to near an inner diameter of the disk. Each of the bands include radial and circumferencial spaced asperity emulating bumps having a population sufficient to produce a constant and continuous output signal from a glide head when the glide head flies lower than a maximum height of the bumps. The height of the bumps within individual bands are substantially uniform, and the average heights of the bumps in each band differ from each other. The configuration of the bumps on the calibration disk advantageously avoids errors caused by disk waviness, runout, and contamination. Further, using the differing heights of the bumps on the calibration disk, a glide head can be calibrated on the glide tester without using an independent fly height measurements for the glide head. Thus, errors in the fly height measurement and the delay in mounting each glide head to a fly height tester are avoided.