Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-10-23
2007-10-23
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112230
Reexamination Certificate
active
10988638
ABSTRACT:
An objective lens is formed as an objective lens element with a diffractive surface on one side. The objective lens focuses a collimated light beam of a first wavelength diffracted by the objective lens onto a first recording medium, a collimated light beam of a second wavelength diffracted by the objective lens onto a second recording medium, and a diverging light beam of a third wavelength diffracted by the objective lens onto a third recording medium. The three light beams are focused at three different working distances from the objective lens and the diffraction orders of the diffracted light of two of the light beams is the same. The objective lens satisfies certain conditions related to the shortest of the three different working distances, the focal length of the objective lens element at the shortest of the three wavelengths, and the thickness of the objective lens.
REFERENCES:
patent: 7206276 (2007-04-01), Kimura et al.
patent: 2001/0008513 (2001-07-01), Arai et al.
patent: 2004/0047269 (2004-03-01), Ikenaka et al.
patent: 2004/0170106 (2004-09-01), Komma
Katsuma Toshiaki
Kitahara Yu
Mori Masao
Ori Tetsuya
Arnold Bruce Y.
Arnold International
Fujinon Corporation
Giesy Adam R.
Henry Jon W.
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