Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-05-06
2008-05-06
Huber, Paul W. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112050, C369S112160
Reexamination Certificate
active
11029599
ABSTRACT:
The optical miniaturized module includes a semiconductor laser for irradiating an optical disk with laser light, a diffraction grating for forming a main beam and two sub beams from the laser light, a polarization hologram for dividing reflected light from the optical disk, and a photodetector for detecting the reflected light. The polarization hologram includes a first parting line defined in a direction optically corresponding to a radial direction as the optical disk rotates. A main beam M incident area is divided with a boundary defined by the first parting line. A sub beam A incident area and a sub beam B incident area are each arranged avoiding the first parting line.
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Minami Kohji
Miyake Tomoyuki
Numata Tomiyuki
Ogawa Masaru
Ueyama Tetsuo
Edwards Angell Palmer & & Dodge LLP
Huber Paul W.
Sharp Kabushiki Kaisha
Tucker David A.
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