Acquiring focus in optical systems using a focus error signal an

Details Acquiring focus in optical systems using a focus error signal an Acquiring focus in optical systems using a focus error signal an

1988-02-12

1991-03-05

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 54, 369110, G11B 795

Patent

active

049982338

ABSTRACT:
A focus acquire circuit for use in optical systems, such as optical data recorders and players, uses up to three parameters signals to indicate an in-focus condition. The zero crossing of a focus error signal is combined with a signal indicating that the focus error signal has approached a peak value and with a signal indicating a change in laser drive signal amplitude to indicate an in-focus condition. Various circuit details are illustrated showing how the three parameters cna be combined together for indicating an in-focus condition.

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