Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-10-31
2010-10-26
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
C369S044230, C369S053270
Reexamination Certificate
active
07821903
ABSTRACT:
An optical pickup device has a first light source and a second light source each adapted for outputting a laser beam of a predetermined wavelength, a photodetector for detecting an intensity of the laser beam outputted from the first light source or the second light source to control the power of the laser beam to be outputted from the first light source or the second light source, a wideband quarter wavelength plate for converting the laser beam outputted from the first light source or the second light source into a circularly polarized laser beam, and a first rise-up mirror and a second rise-up mirror for guiding a P-polarized component in the laser beam converted by the wideband quarter wavelength plate to the photodetector, and guiding an S-polarized component in the laser beam different from the P-polarized component to an optical recording medium. With this arrangement, provided are an optical pickup device and an optical recording medium driving device capable of accurately controlling the power of the light source.
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Arai Akihiro
Nakata Hideki
Shibata Hiroshi
Yamamoto Yo-ichi
Panasonic Corporation
Tran Thang V
Wenderoth , Lind & Ponack, L.L.P.
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