Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2006-04-25
2006-04-25
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S719000, C369S011000, C369S112240
Reexamination Certificate
active
07034974
ABSTRACT:
An optical scanning device (1) for scanning an information layer (4) of an optical record carrier (2), the device including a radiation source (11) for generating a radiation beam (12) and an objective system (18) for converging the radiation beam (12) on the information layer, the objective system (18) being characterized in that the ratio of the root mean square of the optical path difference's (OPD's) generated by the objective system at oblique beam entrance to the system satisfies the condition of formula (I) within the field of the objective system, where OPD(A31) is the contribution of the third order Zernike coma to the root mean square wavefront aberration and OPD(A51) is the contribution of the fifth order Zernike coma to the root mean square wavefront aberration.
REFERENCES:
patent: 5726436 (1998-03-01), Oka et al.
patent: 6052237 (2000-04-01), Opheij et al.
Hendriks Bernardus Hendrikus Wilhelmus
Tukker Teunis Willem
Van As Marco Andreas Jacobus
Cherry Euncha P.
Goodman Edward
Khatri Pranav
Koninklijke Philips Electronics , N.V.
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