| United States Patent | 5,830,514 |
| Barenboim, et. al. | Nov. 3, 1998 |
Abstract
A disk texturing tool is used, for example, to provide textured spots in an annular portion of both sides of a hardfile disk. Disks are moved into and out of the texturing process in cassettes, through two disk-handling stations. Texturing occurs as the annular portions are exposed to a train of pulses from a Q-switched laser. The Q-switch within the laser is driven by a radio-frequency signal form an oscillator, which is in turn driven by a signal from a pulse generator, which can be adjusted to leave the radio-frequency signal on for a variable time between pulses without changing pulse frequency. The laser may be equipped with a shutter and with an electronic gate selectively preventing the production of laser pulses.
| Inventors: | Barenboim; Michael (Boca Raton, FL); Baumgart; Peter Michael (San Jose, CA); Chrusch; Peter P. (Boynton Beach, FL); Karni; Benjamin (San Jose, CA); Kerstens; Pieter J. M. (Boca Raton, FL); Seing; Hong S. (Boca Raton, FL); Tam; Andrew Ching (Saratoga, FL). |
| Assignee: | International Business Machines Corporation (Armonk, NY). |
| Appl. No.: | 707,385 |
| Filed: | Sept. 4, 1996 |
| Intl. Cl. : | G11B 5/84 |
| Current U.S. Cl.: | 425/174.4; 219/121.61; 219/121.68; 264/400; 264/482; 425/385 |
| Field of Search: | 425/174.4, 385, 810; 264/1.27, 1.33, 400, 482; 219/121.61, 121.73, 121.62, 121.68, 121.82 |
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Instruction Manual for Model 7300 Laser Systems, Spectra Physics, Mountain View, CA, 1990.