Optical element and optical pickup

Details Optical element and optical pickup Optical element and optical pickup

2005-01-04

2005-01-04

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S719000, C359S796000, C369S011000

Reexamination Certificate

active

06839188

ABSTRACT:
The system and methods of the present invention are directed to an optical pickup. The optical includes at least a light source, a lens for focusing and irradiating light from the light source on a recording medium, and an optical pickup element. The optical pickup element includes a lens base plate in which a lens made of a material having a high refractive index is embedded within a transparent base plate to pass incident light. The optical element further includes an aberration correction base plate formed of a transparent parallel flat plate-like base plate to pass light and correcting a comatic aberration produced on the lens. The lens base plate and the aberration correction base plate are integrated such that the lens base plate and the aberration correction base plate are parallel to each other. Moreover, the aberration correction base plate is located on the side of a point at which incident light is focused by the lens.. The optical element can reduce the diameter of the lens, increase the radius of curvature of the lens, and correct a comatic aberration produced when an optical axis of incident light is inclined relative to the lens.

REFERENCES:
patent: 6590717 (2003-07-01), Sasano et al.
patent: 20030026006 (2003-02-01), Kitamura et al.

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