Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-03-07
2006-03-07
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112050, C369S120000, C369S121000
Reexamination Certificate
active
07009919
ABSTRACT:
An optical pickup is provided which can read information from a plurality of recording mediums having different wavelengths without the need for a mixing prism. The optical pickup is comprised of a light emission part, a grating, a hologram and a light receiving part. The light emission part emits first and second laser beams having different wavelengths from each other. The grating generates a pair of sub-beams from the laser beam emitted from the light emission part. The hologram generates first and second high-order beams from the laser beam reflected by a recording medium to guide the high-order beams to the light receiving part. The light receiving part receives the first and second high-order beams generates a focus error signal and a tracking error signal which enables the information to be correctly read from the different recording mediums.
REFERENCES:
patent: 5717674 (1998-02-01), Mori et al.
patent: 5912868 (1999-06-01), Hayashi et al.
patent: 6366548 (2002-04-01), Ohyama
patent: 09-120568 (1997-05-01), None
patent: 10-255274 (1998-09-01), None
Huber Paul W.
Pioneer Corporation
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