Manufacture of concentric patterns from spiral source
US7113360B2 · kind B2 · utility
4Cited by
14References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2003 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Sep 4, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59661
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The manufacture of magnetic disks for disk drives requires formation or servo tracks in a concentric pattern on the disk. Certain types of beam apparatuses for forming feature patterns on a disk shaped substrate, such as might be used in hard disk manufacture, however, provide spiral patterns. A ramp type deflection signal therefore is used to deflect the beam so as to form one circular pattern during each rotational cycle, and thereby convert the spiral pattern to a pattern comprising a series of circles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.