Ring zonal phase correction lens and optical system and...

Details Ring zonal phase correction lens and optical system and... Ring zonal phase correction lens and optical system and...

2007-06-26

2007-06-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S742000, C369S112010, C369S112030

Reexamination Certificate

active

11243878

ABSTRACT:
A ring zonal phase correction lens made of resin is provided with a refraction face structurally formed on at least one of a first lens face and a second lens face. The refraction face includes three or more ring zonal shaped refraction curved surfaces which are formed to be adjacent to each other through step portions formed in an optical axis direction for correcting a phase of a laser beam emitted from a laser by respective ring zonal shaped refraction curved surfaces. The step portion is formed such that a lens thickness of an outer ring zonal shaped refraction curved surface becomes thicker than that of an inner ring zonal shaped refraction curved surface and the step portion is formed at a half or more outer area of an effective radius of the refraction face.

REFERENCES:
patent: 2004/0264343 (2004-12-01), Hendriks et al.

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