Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-01-16
2007-01-16
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112010, C369S110030
Reexamination Certificate
active
10491546
ABSTRACT:
Part of reflected light from an optical disc enters a diffraction element (10). The ±first-order diffracted light and zero-order diffracted light from the diffraction device (10) travel via a cylindrical lens (11) and a spot lens (12) and enter a photodetector (13). If an objective lens shifts, a beam on the diffraction element (10) also shifts. Therefore, the intensity distribution of a spot of the zero-order diffracted light falling on light-receiving areas (A, B, C, D) of a four-part light-receiving element (13a) becomes bright as a whole, while the intensity distributions of spots of the ±first-order diffracted light falling on light-receiving areas (E, F) of light-receiving elements (13b,13c) become dark as a whole. Thus, an optical pickup tracking error detecting method and an optical pickup device enabling good tracking control are provided.
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English Translation of PCT International Preliminary Examination Report, dated Sep. 10, 2003 (4 pgs.) for corresponding application No. PCT/JP02/10346.
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Jensen Steven M.
Sharp Kabushiki Kaisha
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