Imaging lens system
AssigneeLargan Precision Co., Ltd.
InventorCHUN-SHAN CHEN
Life of this patent
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Abstract
An imaging lens system comprises, 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 refractive power; a third lens element with refractive power having object-side and image-side surfaces being aspheric, at least one surface thereof having at least one inflection point; a fourth lens element with refractive power having a concave object-side surface and a convex image-side surface; a fifth lens element with refractive power having an aspheric object-side surface and an aspheric concave image-side surface, the image-side surface thereof having at least one inflection point.
Claims29
An imaging lens system comprising five lens elements, the five lens elements being, 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;
- a third lens element having a convex object-side surface;
- a fourth lens element;
- and
- a fifth lens element having an object-side surface and an image-side surface both being aspheric, the image-side surface thereof being concave and provided with at least one inflection point;
- wherein there is an on-axis spacing between every two adjacent lens elements along an optical axis of the imaging lens system, an absolute value of a focal length of the first lens element f1 is smaller than an absolute value of a focal length of the fourth lens element f4;
- wherein 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:
- 20<V1−V2.
An imaging lens system comprising five lens elements, the five lens elements being, 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;
- a third lens element;
- a fourth lens element;
- and
- a fifth lens element having a convex object-side surface and a concave image-side surface, wherein each of the object-side and image-side surfaces thereof is aspheric and has at least one inflection point;
- wherein there is an on-axis spacing between every two adjacent lens elements along an optical axis of the imaging lens system, an absolute value of a focal length of the first lens element is smaller than an absolute value of a focal length of the fourth lens element, an on-axis spacing between the third and fourth lens elements is larger than a lens thickness of the third lens element.
Dependencies are inferred from the claim text.