Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2008-08-21

2009-10-06

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

Reexamination Certificate

active

07599132

ABSTRACT:
An exemplary wide-angle lens system includes, in order from the object side to the image side thereof, a first lens element having a negative optical power and crescent-shaped convex to the object side and a second lens element having a positive optical power. The first and second lens elements are plastic, and the wide-angle lens system satisfies the conditions R1F/R1R>1.24, and R2F/R2R>3.28, where R1F is the radius of curvature of an object-side surface of the first lens element, R1R is the radius of curvature of an image-side surface of the first lens element, R2F is the radius of curvature of an object-side surface of the second lens element, and R2R is the radius of curvature of an image-side surface of the second lens element.

REFERENCES:
patent: 5071235 (1991-12-01), Mori et al.
patent: 6295508 (2001-09-01), Trammell et al.
patent: 6583939 (2003-06-01), Yoshikawa et al.
patent: 2004/0179276 (2004-09-01), Yamakawa

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