Detection of defects embedded in servo pattern on stamper by...

Details Detection of defects embedded in servo pattern on stamper by... Detection of defects embedded in servo pattern on stamper by...

2005-06-07

2005-06-07

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S016000, C360S017000, C369S053100, C369S053200, C369S053150, C369S053160, C369S053170, C356S237100, C356S237200, C356S237300, C356S237400, C356S237500

Reexamination Certificate

active

06903888

ABSTRACT:
Defects of a hard disk drive servo pattern stamper are detected by comparing a scattered light beam pattern against the known servo pattern. A magnetic field is applied to stamper and the beam is linearly polarized. Variations in the physical offset of the beam, its scatter, are indicative of physical defects. Variations in the Kerr rotation of scattered beam are indicative of magnetic defects.

REFERENCES:
patent: 3814943 (1974-06-01), Baker et al.
patent: 5526341 (1996-06-01), Shiba et al.
patent: 5875027 (1999-02-01), Ishiguro et al.

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