Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2009-08-27
2010-12-28
Haley, Joseph (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S103000, C369S120000
Reexamination Certificate
active
07859955
ABSTRACT:
An apparatus for recording/reproducing holographic data and a method of adjusting a position of a recording layer. While an objective lens focusing first and second lights having different wavelengths on a holographic data storage medium including first and second reflective layers reciprocatingly moves in a direction of an optical axis, a focus movement unit, which moves a focus of the second light in the direction of the optical axis until a time difference between a first detection signal generated when the first light is reflected from the first reflective layer and a second detection signal generated when the second light is reflected from the second reflective layer becomes a value corresponding to a position of a desired recording layer, is controlled to move a focal position of the second light so that the focal position of the second light can be adjusted to the position of a desired recording layer.
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European Search Report Issued on Dec. 14, 2009, in corresponding European Application No. 09168928.1 (9 pages).
Bae Jae-cheol
Jeong Taek-seong
Kim In-joo
Park Young-jae
Haley Joseph
NSIP Law
Samsung Electronics Co,. Ltd.
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