Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-01-01
2008-01-01
Korzuch, William R. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112120, C369S112150
Reexamination Certificate
active
10478263
ABSTRACT:
An object of the present invention is to attain stable tracking servo performance by suppressing an offset caused by a shift of an object lens or a tilt of a disk, despite the one-beam method which does not cause reduction in light quantity of the main beam. A diffraction grating is provided between a hologram and a light receiving section, and a diffraction efficiency of the diffraction grating is varied in a grating longitudinal direction. For example, if an incident light beam on the diffraction grating is shifted in the grating longitudinal direction, the quantity of received light in each light receiving section varies to cause offset. By performing tracking servo so as to cancel the change, it is possible to correct the offset, thereby attaining stable tracking servo performance.
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International Search Report (PCT/JP02/11538) (in Japanese, no translation).
Sakai et al., “Hologram Laser Unit for DVDs (Recording-type)” (Paper presented at Academic Conference of Japan Society for Precision Engineering, Periodical Kansai Session, 2002, Published and Presented on Aug. 1, 2002). (Partial translation).
Fujita Noboru
Makioka Hiroshige
Miki Renzaburo
Miyake Takahiro
Miyazaki Osamu
Conlin David G.
Edwards Angell Palmer & & Dodge LLP
Korzuch William R.
Lamb Christopher
Manus Peter J.
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