Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-10-31
2006-10-31
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
07130259
ABSTRACT:
An optical pick-up apparatus includes: a semiconductor laser light source that generates an optical beam; a diffraction grating that divides the optical beam into a main beam and side beams; an optical element that guides the main beam and the side beams that are generated by the diffraction grating onto an optical information medium; and a photodetector that detects a signal from reflected light reflected from the optical information medium. The semiconductor laser light source is configured with a 2-wavelength semiconductor laser device in which a semiconductor laser chip that generates an optical beam having a wavelength of λ1and a semiconductor laser chip that generates an optical beam having a wavelength of λ2are integrated into one chip or are arranged in proximity to each other. The diffraction grating has one grating period Λ by which each of the optical beams having the wavelength λ1and the optical beam having the wavelength λ2, which are generated by the 2-wavelength semiconductor laser device, is divided into a main beam and side beams. The apparatus is applicable to two kinds of optical information media having different track pitches.
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Ise Kouji
Ishida Hiroyuki
Ono Masayuki
Takasuka Shouichi
Chow Lixi
Hamre Schumann Mueller & Larson P.C.
Matsushita Electric - Industrial Co., Ltd.
Young Wayne
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