Electric heating – Metal heating – By arc
Patent
1996-06-17
2000-03-14
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912168, 21912177, B23K 2600
Patent
active
060375655
ABSTRACT:
Magnetic recording media are textured over areas designated for contact in order to minimize friction with data transducing heads. In fabricating a hard disk, an aluminum nickel-phosphorous substrate is polished to a specular finish. A mechanical means is then used to roughen an annular area intended to be the head contact band. An optical and mechanical system allows thousands of spots to be generated with each laser pulse, allowing the textured pattern to be rapidly generated with a low repetition rate laser and an uncomplicated mechanical system. The system uses a low power laser, a beam expander, a specially designed phase plate, a prism to deflect the beam, a lens to transmit the diffraction pattern to the far field, a mechanical means to rotate the pattern and a trigger system to fire the laser when sections of the pattern are precisely aligned. The system generates an annular segment of the desired pattern with which the total pattern is generated by rotating the optical system about its optic axis, sensing the rotational position and firing the laser as the annular segment rotates into the next appropriate position. This marking system can be integrated into a disk sputtering system for manufacturing magnetic disks, allowing for a very streamlined manufacturing process.
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Dane C. Brent
Dixit Shamasundar N.
Everett Mathew
Hackel Lloyd A.
Honig John
Evans Geoffrey S.
The Regents of the University of California
Wooldridge John P.
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