Approximating topology of optical disc surface

Details Approximating topology of optical disc surface Approximating topology of optical disc surface

2007-07-03

2007-07-03

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053230, C369S053280, C369S044280

Reexamination Certificate

active

10662712

ABSTRACT:
A method of one embodiment of the invention is disclosed that outputs an oscillating wave towards a surface of an optical disc. A proximity signal is detected in response to the oscillating wave being output towards the output of the optical disc, and denotes closeness of the oscillating wave to the surface. A number of peaks within the proximity signal are determined. Each peak corresponds to the oscillating wave crossing the surface of the optical disc. The time at which each peak within the proximity signal occurs is correlated with a value of the oscillating wave at that time, yielding a number of time-value pairs. The topology of the surface of the optical disc is approximated from these time-value pairs.

REFERENCES:
patent: 4525625 (1985-06-01), Abe
patent: 4710908 (1987-12-01), Ohshima et al.
patent: 5910936 (1999-06-01), Marino
patent: 2002/0191517 (2002-12-01), Honda et al.

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