Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-06-11
2010-11-16
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044210, C369S044370, C369S110030, C369S112050, C369S112060, C369S112070, C369S112240, C369S112260
Reexamination Certificate
active
07835235
ABSTRACT:
An optical pickup apparatus and an optical recording/reproducing system including the same, the optical pickup apparatus includes at least two optical systems for different types of optical recording media, one of objective lenses of the optical systems being offset from a central line of the optical recording medium, wherein the optical system including the offset objective lens having a diffraction grating diffracting light emitted from a light source to form a main beam and sub-beams, wherein the diffraction grating includes first and second diffraction regions having different grating patterns arranged alternately thereon, and a center of each sub-beam is arranged at a boundary of the first and second diffraction regions of the diffraction grating, and a center of the diffraction grating and an optical axis of the light source are adjusted to be coincided with each other, preventing generation of an alternating current in a Push-Pull signal of the sub-beams.
REFERENCES:
patent: 2006/0193219 (2006-08-01), Kawamura et al.
patent: 2008/0037387 (2008-02-01), Park et al.
patent: 2008/0253263 (2008-10-01), Komma
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Kim Ui-yol
Lee Jong-kook
Park Sun-mook
Seong Pyong-yong
Feild Joseph H
Iluyomade Ifedayo
NSIP Law
Toshiba Samsung Storage Technology Korea Corporation
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