Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2008-05-06
2008-05-06
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112190, C369S112100
Reexamination Certificate
active
10998570
ABSTRACT:
Disclosed is an optical pickup including a polarization holographic optical element (HOE) and a photodetector. The optical pickup includes a light source, an optical path changer, an objective lens, a polarization HOE, and a photodetector. The polarization HOE has a pattern designed to generate different astigmatisms in the left and right halves of the polarization HOE in a tangential direction and to divide plus and minus first-order beams in a radial direction. The photodetector includes a first light-receiving portion receiving a zero-order beam and second and third light-receiving portion that are disposed on either side of the first light-receiving portion in the tangential direction and respectively receive the plus and minus first-order beams.
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Machine translation of Iwasaki et al. (JP 2003-099977).
Heor Tae-Youn
Kim Bong-Gi
Pae Jung-Gug
Park Soo-Han
Agustin Peter Vincent
Korzuch William
Roylance Abrams Berdo & Goodman LLP
Samsung Electronics Co,. Ltd.
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