Optical scanning device

Details Optical scanning device Optical scanning device

2008-04-22

2008-04-22

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112020

Reexamination Certificate

active

10490362

ABSTRACT:
An optical scanning device for scanning first and second type of record carriers includes a radiation-generating device for generating a radiation beam having first and second wavelengths in the different modes. An objective system focuses the radiation beam on the record carrier. An optical element is provided having a structure in the radiation beam for introducing vergence and aberration in the radiation beam of the second wavelength. The aberration may be written as a polynomial with at least two terms a2ρ2and a4ρ4. If a2=0 and a4=0, the corresponding values of a4 and a2 are given by a40 and a20, respectively. a2, a4, a20 and a40 satisfy the relation 0.9<((a2/a20)+(a4/a40))<1.1, as well as either the relation 0.20<(a2/a20)<0.90 (if a40) or the relation 1.05<(a2/a20)<2.00 (if a4<0).

REFERENCES:
patent: 6084843 (2000-07-01), Abe et al.
patent: 7012876 (2006-03-01), Hendriks et al.
patent: 0 881 634 (1998-12-01), None
patent: 1 109 164 (2001-06-01), None
patent: WO99 57720 (1999-11-01), None

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