Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-11-06
2007-11-06
Psitos, Aristotelis M. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112180, C369S121000, C359S205100, C359S569000
Reexamination Certificate
active
10297121
ABSTRACT:
An optical scanning device for scanning of a first, second and third type of optical record carrier with radiation of a first wavelength λ1, a second wavelength λ2and a third wavelength λ3, respectively, where the three wavelengths are substantially different.The device comprises: a radiation source for emitting a beam of said radiation, an objective system for converging the beam on a selected one of the optical record carriers, and a phase structure arranged in the path of the beam, the phase structure comprising a plurality of phase elements of different heights, forming a non-periodic stepped profile of optical paths in the beam, and is characterised in that the stepped profile substantially approximates a flat wavefront at the first wavelength λ1, a spherical aberration wavefront at the second wavelength λ2, and a flat or spherical aberration wavefront at the third wavelength λ3.
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De Vries Jorrit Ernst
Hendriks Bernardus Hendrikus Wilhelmus
Belk Michael E.
Koninklijke Philips Electronics , N.V.
Psitos Aristotelis M.
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