Multi-focal length miniature refractive element and method...

Details Multi-focal length miniature refractive element and method... Multi-focal length miniature refractive element and method...

2005-09-20

2005-09-20

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Plural focal length

C359S741000, C430S321000

Reexamination Certificate

active

06947223

ABSTRACT:
A monolithic multi-focal length miniature refractive element comprising a first surface region and a second surface region. The first surface region has a first characteristic radius of curvature. The second surface region has a second radius of curvature that is different from the first characteristic radius of curvature. The first and second surface regions are formed on a single optical element blank. The optical element blank can be a composite of two or more materials.

REFERENCES:
patent: 3610924 (1971-10-01), Sinai
patent: 4450593 (1984-05-01), Poler
patent: 5618474 (1997-04-01), Liau et al.
patent: 5760871 (1998-06-01), Kosoburd et al.
patent: 2004/0184155 (2004-09-01), Kornblit et al.

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