Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-04-04
2006-04-04
Tran, Thang V. (Department: 2653)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112280, C369S112290
Reexamination Certificate
active
07023787
ABSTRACT:
An optical pickup device has a first combination reception and emission device (1) which emits laser beams (10) to an optical disk, and a second combination reception and emission device (2) which emits laser beams (11) having a wavelength different from that of the laser beams (10) to an optical disk. A DBS (3) is disposed on a path of the laser beams for making axes (12, 13) of the laser beams coincident with each other at an output side. A monitoring light detection element (9) is disposed near and above the DBS such that a light-receiving surface of the monitoring light detection element is substantially parallel with the optical axes (12, 13) of the laser beams (10, 11). The monitoring light detection element (9) receives laser beams outside of an effective region emitted by the first and second combination reception and emission devices (1, 2).
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Chinese Office Action issued Sep. 24, 2004, with English translation.
Goma Tawfik
Morrison & Foerster / LLP
Sharp Kabushiki Kaisha
Tran Thang V.
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