Focus detection in a digital focus servo system

Details Focus detection in a digital focus servo system Focus detection in a digital focus servo system

2005-11-29

2005-11-29

Miller, Brian E. (Department: 2652)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044250

Reexamination Certificate

active

06970410

ABSTRACT:
A system for determining whether a focus servo system is in focus or out of focus (i.e. open) is disclosed. A sum signal can be compared with a threshold value. If the sum signal is below the threshold value, then a focus open condition (i.e., out-of-focus) can be indicated. In some embodiments, a focus open condition is indicated where the sum signal remains below the threshold value for a predetermined period of time.

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