Optical scanning device including a tilt tolerant objective...

Details Optical scanning device including a tilt tolerant objective... Optical scanning device including a tilt tolerant objective...

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.

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