Wide-angle lens system
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsTing-Yu Cheng, Chun-Hsiang Huang
Life of this patent
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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.
Claims14
A wide-angle lens system comprising, in order from the object side to the image side thereof with no intervening lenses:
- a first lens element having a negative optical power convex to the object side;
- and
- a second lens element having a positive optical power;
- wherein the wide-angle lens system satisfies the following conditions:
- R1F/R1R>1.24;
- R2F/R2R>3.28;
- ν1<ν2 and ν1<30;
- wherein R1F is the radius of curvature of the object-side surface of the first lens element, R1R is the radius of curvature of the image-side surface of the first lens element, R2F is the radius of curvature of the object-side of the second lens element, R2R is the radius of curvature of the image-side surface of the second lens element,ν1 is Abbe number of the first lens element and ν2 is Abbe number of the second lens element.
A wide-angle lens system comprising, in the order from the object side to the image side:
- a first lens element having a negative optical power convex to the object side;
- an aperture stop formed on the first lens element;
- and
- a second lens element having a positive optical power and facing the aperture stop of the first lens element;
- wherein the wide-angle lens system satisfies the following conditions:
- R1F/R1R>1.24;
- R2F/R2R>3.28;
- ν1<ν2 and ν1<30;
- wherein R1F is the radius of curvature of the object-side surface of the first lens element, R1R is the radius of curvature of the image-side surface of the first lens element, R2F is the radius of curvature of the object-side surface of the second lens element, R2R is the radius of curvature of the image-side surface of the second lens element, ν1 is Abbe number of the first lens element and ν2 is Abbe number of the second lens element.
Dependencies are inferred from the claim text.