Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Reexamination Certificate
2005-05-31
2005-05-31
Sugarman, Scott J. (Department: 2873)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
C359S668000, C359S626000, C369S112230
Reexamination Certificate
active
06901045
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: 5535058 (1996-07-01), Tanaka et al.
patent: 5684641 (1997-11-01), Tanaka et al.
Kishima Koichiro
Kouchiyama Akira
Hasan M.
Sugarman Scott J.
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