Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2009-07-28
2010-12-21
Agustin, Peter Vincent (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112020
Reexamination Certificate
active
07855940
ABSTRACT:
A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t1with a laser beam having a wavelength λ1and wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t2with a laser beam having a wavelength λ2. The phase compensator compensates wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t3with a laser beam having a wavelength λ3.
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Hirao Keiko
Makino Yutaka
Mitsui Yoshikazu
Miyauchi Mitsuhiro
Sugi Yasuyuki
Agustin Peter Vincent
Hitachi Maxell Ltd.
Oliff & Berridg,e PLC
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