Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-07-24
2007-07-24
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044120, C369S044230, C369S112050, C369S112280
Reexamination Certificate
active
10849158
ABSTRACT:
Disclosed is an optical head in which position adjustment of a photodetector light receiving surface or component parts may be simplified, production costs may be reduced and operational reliability may be improved. The optical head includes a light source22, radiating light of a preset wavelength, an objective lens27for condensing the outgoing light from the light source22on an optical disc2and for condensing the return light from the optical disc2, a beam splitter25for branching the optical path of the return light reflected by the optical disc2, and for collimating the branched return light so as to be parallel to the outgoing light from the light source22, a composite optical component including a splitting prism30arranged on a site of incidence of the branched return light for spatially splitting the return light, and a light receiving unit for receiving plural return light beams spatially split by the splitting prism30for producing focusing error signals.
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Fukasawa Norio
Kubo Minoru
Murakami Souichi
Saito Masahiro
Suzuki Junichi
Kananen Ronald P.
Rader & Fishman & Grauer, PLLC
Sony Corporation
Tran Thang V.
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