Objective lens, optical system and optical pickup apparatus

Details Objective lens, optical system and optical pickup apparatus Objective lens, optical system and optical pickup apparatus

2006-04-18

2006-04-18

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112260

Reexamination Certificate

active

07031076

ABSTRACT:
An optical system for use in an optical pickup apparatus has a chromatic aberration correcting element having plural ring-shaped zones divided with a stepped section in such a way that one of the neighboring ring-shaped zones located apart from the optical axis has a longer optical path than the other one located closer to the optical axis, and an objective lens having plural ring-shaped zones divided with a stepped section shaped in the optical axis direction in such a way that the stepped section causes a optical path difference between light fluxes having passed through the neighboring ring-shaped zones. The ring-shaped zonal structure of the chromatic aberration correcting element corrects a deviation of a focal point caused by the objective lens due to a wavelength fluctuation of an incident light flux coming into the optical system.

REFERENCES:
patent: 2004/0213131 (2004-10-01), Kimura et al.
patent: 2004/0264349 (2004-12-01), Kimura et al.

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