Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-08-21
2007-08-21
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S118000
Reexamination Certificate
active
10625709
ABSTRACT:
An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light transmissive layer; a second projector for projecting a second light beam of a second wavelength longer than the first wavelength so as to record and reproduce information with respect to an optical disk having a second light transmissive layer; an objective lens common to the first and second light beams; and a diffraction optical element made of a lens with a diffraction grating and a refracting face and disposed in an optical path between the first and second projectors and the objective lens. The diffraction optical element is set to satisfy a predetermined equation. As a result, an optical pickup is realized that uses a single focusing means to focus light beams of different wavelengths, so as to record and reproduce information with respect to different kinds of optical disks (recording media) respectively having light transmissive layers of different thicknesses and respectively using different optimum wavelengths of light for reproducing.
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“DVD/CD Compatibility Using Blu-ray Disc Pick Up” (Naoki Kaiho et al., Proceedings of the 63rd Annual Meeting of Applied Physics, Sep. 2002, No. 3, p. 1008, Lecture No. 27p-YD-5).
Nakano Ikuo
Nishioka Sumito
Ogata Nobuo
Conlin David C.
Korzuch William
Lamb Christopher
Manus Peter J.
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