Manufacture of concentric patterns from spiral source

Details Manufacture of concentric patterns from spiral source Manufacture of concentric patterns from spiral source

2006-09-26

2006-09-26

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07113360

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.

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Co-pending U.S. Appl. No. 10/449,727, filed Jun. 2, 2004, Deerman et al.

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