Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-06-24
2009-12-29
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C250S216000, C369S044410, C369S044230
Reexamination Certificate
active
07639574
ABSTRACT:
An optical pickup including: a monolithic laser light-emitting unit for emitting a first laser beam and a second laser beam having mutually different wavelengths; an one-sided spectrally separating unit for spectrally separating the first laser beam and the second laser beam; a polarizing unit for allowing the laser beam passed through the one-sided spectrally separating unit to be introduced to an optical disk side and for reflecting reflected light from the optical disk; an astigmatism unit for imparting astigmatism to the reflected light; and a photodetecting unit in which a first laser reflected light-receiving portion is arranged in such a manner as to be offset from a second laser reflected light-receiving portion, wherein an optical system is constructed such that a long-axis direction of an ellipse indicating a light spot on the optical disk becomes oblique with respect to a tracking direction.
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Funai Electric Co. Ltd.
Morgan & Lewis & Bockius, LLP
Nguyen Linh T
Young Wayne R
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