Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-03-29
2009-02-17
Dinh, Tan X (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112290, C369S112050
Reexamination Certificate
active
07492695
ABSTRACT:
An optical pickup device according to the present invention is constituted so that a laser beam emitted from a light receiving and emitting integral-type element is transmitted or reflected by a beam splitter, transformed to a parallel beam by a collimator lens, introduced into an objective lens, transmitted through the objective lens, and collected on a recording surface of an optical disc and the laser beam thus collected is returned to the light receiving and emitting integral-type element via a reverse path after the laser beam is reflected by the recording surface of the optical disc. The optical pickup device includes a front monitor light receiving element that is arranged between the light receiving and emitting integral-type element and the collimator lens, receives a part of the laser beam emitted from the light receiving and emitting element, and detects a quantity of the received laser beam. The front monitor light receiving element includes a received-light-quantity increasing unit that increases the quantity of the received laser beam.
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Kanai Takeshi
Ohta Keisuke
Dinh Tan X
Morrison & Foerster / LLP
Sharp Kabushiki Kaisha
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