Optical lens and method of producing the same, method of...

Details Optical lens and method of producing the same, method of... Optical lens and method of producing the same, method of...

2005-12-27

2005-12-27

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S668000, C430S321000, C369S112260

Reexamination Certificate

active

06980373

ABSTRACT:
An optical lens whose focal length is different on first and second planes perpendicular to each other is provided. The optical lens is configured such that a convex element, which is formed integrally with a substrate having a flat face, has a convex curved face that functions as an optical lens and is shaped such that the curvature on a first cross section and the curvature on a second cross section perpendicular to and intersecting with the first cross section are different from each other, whereby the focal lengths on the first and second cross sections are different from each other. A groove of a substantially elliptical shape or a substantially rectangular shape is formed along the boundary between the substrate and the convex element. The optical lens is used to produce a focus error signal or is incorporated into an optical pickup apparatus.

REFERENCES:
patent: 4684222 (1987-08-01), Borrelli et al.
patent: 5316640 (1994-05-01), Wakabayashi et al.
patent: 5684641 (1997-11-01), Tanaka et al.

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