Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-08-19
2010-11-09
Hindi, Nabil Z (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
07830772
ABSTRACT:
There is provided an objective optical system for an optical information recording/reproducing device. The objective optical system includes an optical element having an annular zone structure on at least one surface. The annular zone structure includes annular zones configured to have at least one step formed, at a boundary between adjacent ones of the annular zones, to extend in a direction of an optical axis. The at least one step is provided to cause a predetermined optical path length difference between a light beam passing through an outside of the boundary and a light beam passing through an inside of the boundary. The predetermined optical path length difference given to a first light beam by the at least one step is approximately equal to an odd multiple of a first wavelength λa. Abbe number of material of the optical element satisfies a condition of 15<νd<35.
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U.S. Appl. No. 12/233,048 to Koreeda et al, filed Sep. 19, 2008.
Koreeda Daisuke
Takeuchi Shuichi
Tashiro Yoshiyuki
Greenblum & Bernstein P.L.C.
Hindi Nabil Z
Hoya Corporation
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