Optical system for optical pickup employing coma...

Details Optical system for optical pickup employing coma... Optical system for optical pickup employing coma...

2005-05-24

2005-05-24

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S642000, C369S112010

Reexamination Certificate

active

06898024

ABSTRACT:
A coma compensating element has two refraction surfaces. The refraction surfaces provide, as a whole, no aberration with respect to rays perpendicularly incident thereon, while the refraction surfaces provide coma with respect to rays obliquely incident thereon.

REFERENCES:
patent: 5726436 (1998-03-01), Oka et al.
patent: 2000182268 (2000-06-01), None

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