Imaging lens system
AssigneeLargan Precision Co., Ltd.
InventorCHUN-SHAN CHEN
Life of this patent
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Abstract
This invention provides an imaging lens system including, in order from an object side to an image side: a first lens with positive refractive power having a convex object-side surface; a second lens with negative refractive power; a third lens having a concave image-side surface; a fourth lens with positive refractive power; a fifth lens with negative refractive power having a concave image-side surface, at least one surface thereof having at least one inflection point; and an aperture stop disposed between an imaged object and the third lens. The on-axis spacing between the first lens and second lens is T12, the focal length of the imaging lens system is f, and they satisfy the relation: 0.5<(T12/f)×100<15.
Claims25
An imaging lens system including, in order from an object side to an image side:
- a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
- a second lens element with negative refractive power;
- a third lens element;
- a fourth lens element having a convex image-side surface;
- and
- a fifth lens element having an object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one surface thereof being provided with at least one inflection point;
- wherein the lens elements with refractive power are the first, second, third, fourth and fifth lens elements;
- a focal length of the imaging lens system is f, a focal length of the first lens element is f1, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relations are satisfied:
- 1.0<f/f1<1.8;
- and
- V1−V2>20.
An imaging lens system including, in order from an object side to an image side:
- a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
- a second lens element with negative refractive power;
- a third lens element;
- a fourth lens element having a concave object-side surface and a convex image-side surface;
- and
- a fifth lens element having an object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one surface thereof being provided with at least one inflection point;
- wherein the lens elements with refractive power are the first, second, third, fourth and fifth lens elements;
- an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and the following relation is satisfied:
- V1−V2>20.
An imaging lens system including, in order from an object side to an image side:
- a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
- a second lens element with negative refractive power;
- a third lens element with negative refractive power;
- a fourth lens element having a concave object-side surface and a convex image-side surface;
- and
- a fifth lens element having an object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one surface thereof being provided with at least one inflection point;
- wherein the lens elements with refractive power are the first, second, third, fourth and fifth lens elements.
Dependencies are inferred from the claim text.