Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2011-03-22
2011-03-22
Negrón, Daniell L (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
07911915
ABSTRACT:
An optical pickup includes a diffraction grating partitioned into three areas, in which the phase of periodic grating groove structure in an area is successively shifted from that in the adjacent area by 90°. In the generation of a differential push-pull signal, an amplification factor K for sub push-pull signals is varied depending on the type of the optical disk. By such composition of the optical pickup, amplitude deterioration of the tracking error signal accompanying displacement of the object lens is reduced.
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Inoue Masayuki
Kawamura Tomoto
Ohnishi Kunikazu
Heyi Henok
Hitachi , Ltd.
Hitachi Media Electronics Co. Ltd.
McDermott Will & Emery LLP
Negrón Daniell L
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