Method for controlling laser power in a texturing process

Details Method for controlling laser power in a texturing process Method for controlling laser power in a texturing process

1996-09-05

1998-08-04

Trammell, James P.

Boots, shoes, and leggings

36457101, 360135, 369176, 372 29, B05D 136

Patent

active

057904332

ABSTRACT:
A disk texturing tool is used, for example, to provide textured spots in an annular portion of both sides of a disk for a hard disk drive. Disks are moved into and out of the texturing process in cassettes, through two disk-handling stations. An optical system includes a laser directed at a beamsplitter to split the laser beam into two beams having approximately power, which are directed along parallel paths through a power control optics block to expose simultaneously opposite sides of a disk to be textured. The power level of each of these two beams is controlled by a program which operates in a teach mode to develop a look up table describing laser beam power as a function of a signal driving an attenuator, in a set point mode setting this drive signal to provide a certain laser beam power, in a run mode controlling this power through a feedback loop, and in a display mode showing laser beam power as a function of time.

REFERENCES:
patent: 5046138 (1991-09-01), Brubb, III
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5382785 (1995-01-01), Rink
patent: 5528922 (1996-06-01), Baumgart et al.
patent: 5539213 (1996-07-01), Meeks et al.
patent: 5595768 (1997-01-01), Treves et al.
patent: 5595791 (1997-01-01), Baumgart et al.

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