US 2013/0155528 A1 · OPTICAL LENS SYSTEM FOR IMAGE TAKING

Abstract

An optical lens system for image taking includes, in order from an object side to an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface with the at least one surface being aspheric, and a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface with the at least one surface being aspheric. The image-side surface of the third lens element includes at least one inflection point. By adjusting spacing between any two lens elements, the optical lens system for image taking has a desirable space allocation and can effectively correct the Petzval Sum in order to obtain superior imaging quality.

Claims21

Dependent claims

An optical lens system for image taking comprising, in order from an object side to an image side:

a first lens element with positive refractive power comprising a convex object-side surface;
a second lens element with negative refractive power comprising a concave object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface being aspheric;
and
a third lens element with negative refractive power comprising a convex object-side surface and a concave image-side surface, at least one of the object-side surface and the image-side surface being aspheric, and the image-side surface comprising at least one inflection point;
the optical lens system for image taking satisfying the following condition:
0.6<T12/T23<2.55;
wherein T12 is the axial distance between the first lens element and the second lens element, and T23 is the axial distance between the second lens element and the third lens element.

4 more elements

An optical lens system for image taking comprising, in order from an object side to an image side:

a first lens element with positive refractive power comprising a convex object-side surface;
a second lens element with negative refractive power comprising a concave object-side surface and a concave image-side surface, and both the object-side surface and the image-side surface being aspheric;
and
a third lens element comprising a convex object-side surface and a concave image-side surface, and both the object-side surface and the image-side surface being aspheric;
the optical lens system for image taking satisfying the following condition:
0.6<T12/T23<2.55;
−0.8<R3/R4<0;
−1.05<f/f2<−0.1;
and
0<|f/f3|<0.55;
wherein T12 is the axial distance between the first lens element and the second lens element, T23 is the axial distance between the second lens element and the third lens element, R3 is the curvature radius of the object-side surface of the second lens element, R4 is the curvature radius of the image-side surface of the second lens element, f is the focal length of the optical lens system for image taking, f2 is the focal length of the second lens element, and f3 is the focal length of the third lens element.

8 more elements

Dependencies are inferred from the claim text.

Optical lens system for image taking

Life of this patent

Optical lens system for image taking

Life of this patent

Abstract

Claims21