Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2008-05-06
2008-05-06
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044410
Reexamination Certificate
active
07369466
ABSTRACT:
An optical pickup apparatus and method are provided. The apparatus and method include a light source unit having a holder in which an optical module having first and second light sources for emitting light having different wavelengths and a grating are installed, an optical path changer for changing a path of the light emitted from the first or second light sources, an object lens for focusing light passing through the optical path changer on a relatively thin disc or a relatively thick disc, and a photodetector unit. The photodetector unit includes a first photodetector having a first main photodetector, a first sub-photodetector, and a second sub-photodetector for receiving light diffracted into three beams by the grating and reflected by the relatively thin disc and converting the received light into an electrical signal, and a second photodetector having a second main photodetector, a third sub-photodetector, and a fourth sub-photodetector for receiving light diffracted into three beams by the grating and reflected by the relatively thick disc and converting the received light into an electrical signal.
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Bibbins Latanya
Roylance Abrams Berdo & Goodman L.L.P.
Samsung Electronics Co,. Ltd.
Young Wayne
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