Pneumatic hub locking device for etching optical servo tracks on magnetic disks
US5322987A · kind A · utility
30Cited by
12References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1992 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Jun 10, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59677
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An apparatus for etching optical servo tracks on a magnetic storage disk comprises optics for generating a beam of light for etching the servo tracks and a spindle for rotating the disk in proximity to the optics. The device further comprises a center pin at the center of rotation of the spindle and an alignment pin which is off-center of the spindle. A disk to be etched is placed on the spindle with the center pin through a center hole in the disk hub. A pressurized gas nozzle directs bursts of pressurized gas toward the edge of the disk to rotate the disk until an alignment hole in the disk hub engages the alignment pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.