Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2004-12-23
2008-10-28
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
C369S112030
Reexamination Certificate
active
07443779
ABSTRACT:
An objective optical system includes a diffractive optical element on the light source side of an objective lens for focusing incident light of three different wavelengths with two different numerical apertures onto three different optical recording media. The diffractive optical element is formed of two lens elements made of different materials that are cemented together at a diffractive surface. Three conditions are satisfied so as to achieve optimum imaging. The diffractive surface may be shaped so that the order of the diffracted light of the shortest wavelength λ2having the largest diffracted intensity is different from the order of the diffracted light of the second wavelength λ2having the largest diffracted intensity, and the order of the diffracted light of the first wavelength λ1having the largest diffracted intensity is also different from the order of the diffracted light of the third wavelength λ3having the largest diffracted intensity.
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Katsuma Toshiaki
Kitahara Yu
Mori Masao
Ori Tetsuya
Yamakawa Hiromitsu
Arnold Bruce Y.
Arnold International
Fujinon Corporation
Henry Jon W.
Hindi Nabil Z
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