Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-11-20
2007-11-20
Luu, Thanh X. (Department: 2878)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044350, C369S044410, C369S120000
Reexamination Certificate
active
11227912
ABSTRACT:
An optical pickup for recording and/or reproducing data with respect to a multilayer recording medium having a plurality of recording layers, where the optical pickup includes a light source emitting a beam having a predetermined wavelength, a diffraction unit separating the beam emitted from the light source into a main beam and a sub-beam, and a photodetector having a main photodetector detecting a main beam reflected from the multilayer recording medium and a sub-photodetector detecting the sub-beam. In the optical pickup, the main photodetector and sub-photodetector are separated a predetermined distance from each other so that a beam spot formed by the beam reflected from a defocus recording layer is not detected by the sub-photodetector.
REFERENCES:
patent: 5416766 (1995-05-01), Horimai
patent: 5923632 (1999-07-01), Kato et al.
patent: 6392965 (2002-05-01), Ueyama
patent: 6654323 (2003-11-01), Takasaki et al.
patent: 6687201 (2004-02-01), Ma et al.
patent: 2002/0006088 (2002-01-01), Ma et al.
patent: 2002/0034108 (2002-03-01), Ogasawara et al.
patent: 2004/0202093 (2004-10-01), Ma et al.
patent: 1142276 (1997-02-01), None
patent: 2000-57592 (2000-02-01), None
Office Action issued in Korean Patent Application No. 2005-29956 issued on Jul. 27, 2006.
Office Action issued in Chinese Patent Application No. 200510123714.2 on Mar. 30, 2007.
Chung Chong-sam
Hong Tao
Kim Tae-kyung
LeGasse, Jr. Francis M.
Luu Thanh X.
Samsung Electronics Co,. Ltd.
Stein, McEwen & Bui LLP
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