Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-02-08
2005-02-08
Hindi, Nabil (Department: 2655)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112150, C369S112220
Reexamination Certificate
active
06853614
ABSTRACT:
An optical pickup includes an aberration correction element to correct chromatic aberration caused by variation of power from a light source when changing between operating modes in a recording medium. The aberration correction includes a first retardation member, which includes a stepped convex pattern with a plurality of steps at one side, and a second retardation member combined with the first retardation member. The second retardation member includes a stepped concave pattern with a plurality of steps at one side facing the first retardation member, the stepped concave pattern corresponding to the stepped convex pattern. The first and the second retardation members include different refractive indices for a light beam, which allows the first and the second retardation members to selectively create a phase difference of an incident light beam according to a polarization of the incident light beam.
REFERENCES:
patent: 6480454 (2002-11-01), Wada et al.
patent: 6584058 (2003-06-01), Yoshikawa et al.
Ahn Young-man
Chung Chong-sam
Kim Tae-kyung
Suh Hea-jung
Hindi Nabil
Samsung Electronics Co,. Ltd.
Stein, McEwen & Bui LLP
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