Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-08-28
2009-08-11
Edun, Muhammad N. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112140, C369S112280, C369S044230
Reexamination Certificate
active
07573801
ABSTRACT:
An optical pickup includes a hologram element. The hologram element is provided with a hologram pattern including a splitting section for focus which splits light used for the detection of an FES and a splitting section for tracking which splits light used for the detection of a TES. The splitting section for tracking is formed in a region excluding a region interposed between a first virtual straight line and a second virtual straight line. The first virtual straight line is drawn on the hologram element in parallel to an X direction and passes through an optical axis of reflected light entering the hologram element in a state where the objective lens is in a neutral position, and the second virtual straight line is drawn in parallel to the first virtual straight line, while being spaced at a distance d from the first virtual straight line.
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Matsubara Kazunori
Miyazaki Osamu
Murakami Shinzoh
Tsuchida Kazuhiro
Ueyama Tetsuo
Conlin David G.
Edun Muhammad N.
Edwards Angell Palmer & & Dodge LLP
Jensen Steven M.
Sharp Kabushiki Kaisha
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