Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-12-14
2009-10-27
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S044370, C369S112030, C369S112050
Reexamination Certificate
active
07609606
ABSTRACT:
Provided is an optical pickup device capable of suppressing an increase in the number of parts and complication of an optical system while a diffraction grating is used as an optical axis correcting element. Three kinds of blue, red, and infrared laser light beams are emitted from laser element provided in the same CAN package. A blue light emitting point (wavelength: 405 nm) and an infrared light emitting point (wavelength: 780 nm) are arranged in a layer forming direction of the laser elements such that an interval (d2) between the light emitting points becomes shorter than an interval (d1) between each of the light emitting points and a red light emitting point. An optical axis of the laser light beam emitted from the red light emitting point (wavelength: 650 nm) is aligned with an optical axis of the laser light beam emitted from the blue or infrared light emitting point by using the diffraction grating. The number of diffraction gratings for optical axis correction can be made to one and a single photo detector can be commonly used for laser light beams having different wavelengths.
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Chinese Office Action, with English Translation, issued in Chinese Patent Application No. CN 200510134062.2, filed on May 18, 2007.
Kajiyama Seiji
Nagatomi Kenji
Tsuchiya Yoichi
Feild Joseph H
Lamb Christopher R
McDermott Will & Emery LLP
Sanyo Electric Co,. Ltd.
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