Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-07-01
2008-07-01
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S094000, C369S112030
Reexamination Certificate
active
07394745
ABSTRACT:
There is provided an optical pickup device comprising a laser light source for emitting a laser beam, an object lens for focusing the laser beam onto the recording surfaces of layers0and1of an optical disk and condensing the laser beam onto the recording surfaces, photodetectors for receiving the laser beam reflected by the optical disk, and a diffraction grating for diffracting a part of the reflected laser beam toward the photodetectors, wherein data can be simultaneously written to layers0and1. The photodetector detects the reflected light from layer0after being refracted by the diffraction grating, and detects the reflected light from layer1without being refracted, so that the data of layers0and1can be simultaneously read. Thus, data can be simultaneously read from and written to the recording surfaces of a plurality of layers of an optical disk.
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Crowell & Moring LLP
Funai Electric Co. Ltd.
Goma Tawfik
Tran Thang V.
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