Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-03-15
2005-03-15
McFadden, Susan (Department: 2655)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112170, C369S112100, C369S112040, C369S112010, C369S112030
Reexamination Certificate
active
06868055
ABSTRACT:
An optical pickup can be provided, the optical pickup being capable of recording and playback of a plurality of optical disks having different specs by using light beams of different wavelengths, and further being suitable for integrating the semiconductor lasers and light receiving elements into a single package, by including: first and second semiconductor lasers adjacently disposed; a three-beam diffraction grating for generating three beams for tracking control; a second hologram element for diffracting light of the second semiconductor laser to guide it to a photosensor; a complex polarization beam splitter (PBS) for reflecting only light from the first semiconductor laser; and a first hologram element for diffracting light of the first semiconductor laser to guide it to the photosensor.
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Korean Patent Office Action and English translation.
Fujita Noboru
Hirajima Hiroshige
Kurata Yukio
Masui Katsushige
Miki Renzaburo
Conlin David G.
Edwards & Angell LLP
Jensen Steven M.
McFadden Susan
Ortiz-Criado Jorge Leonardo
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