Servo controlling apparatus and method of holographic...

Details Servo controlling apparatus and method of holographic... Servo controlling apparatus and method of holographic...

2008-07-10

2011-12-27

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S094000, C369S053280

Reexamination Certificate

active

08085642

ABSTRACT:
A servo controlling apparatus of a holographic information recording/reproducing system changes the foci of reference light and signal light in a depth direction of a holographic information storage medium to record information over a plurality of information layers. A servo control is changed from a normal servo operation to a between-movement servo operation while movement between information layers is made during a recording operation, and the servo control is changed back to the normal servo operation when the movement between information layers is completed. The between-movement servo operation maintains a servo control state that exists before the movement between information layers.

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Search Report and Written Opinion issued by the International Searching Authority in International Patent Application No. PCT/KR2008/004791 on Feb. 24, 2009.

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