Image capturing lens assembly
AssigneeLargan Precision Co., Ltd.
InventorsChih-Wen Hsu, Ming-Ta Chou
Life of this patent
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Abstract
This invention provides an image capturing lens assembly in order from an object side to an image side comprising five lens elements with refractive power: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface, a second lens element with positive refractive power having a convex image-side surface, a third lens element with positive refractive power having a convex object-side surface, a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and a fifth lens element with positive refractive power. By such arrangement, sufficient field of view is provided, and the aberration of the lens assembly is corrected for obtaining higher image resolution.
Claims18
An image capturing lens assembly comprising five lens elements with refractive power, in order from an object side to an image side:
- a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
- a second lens element with positive refractive power having a convex image-side surface;
- a third lens element with positive refractive power having a convex object-side surface;
- a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side and the image-side surfaces of the fourth lens element is aspheric, at least one inflection point is formed on at least one of the object-side and the image-side surfaces of the fourth lens element, and the fourth lens element is made of plastic;
- and
- a fifth lens element with positive refractive power, wherein at least one of the object-side and the image-side surfaces of the fifth lens element is aspheric, and the fifth lens element is made of plastic;
- wherein a focal length of the image capturing lens assembly is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, an axial distance between the second lens element and the third lens element is T23, and they satisfy the following relations:
- −1.45<f/f1<−0.55;
- 0.15<f/f2<1.0;
- 0.5<f/f3<1.5;
- and
- 0<(T23/f)*10<5.0.
An image capturing lens assembly comprising, in order from an object side to an image side, a front lens group, a stop and a rear lens group:
- the front lens group comprising, in order from an object side to an image side:
- a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
- and
- a second lens element with positive refractive power having a convex image-side surface;
- the rear lens group comprising, in order from an object side to an image side:
- a third lens element with positive refractive power having a convex object-side surface;
- a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side and the image-side surfaces thereof, and the fourth lens element is made of plastic;
- and
- a fifth lens element with positive refractive power, at least one of the object-side and the image-side surfaces thereof being aspheric, and the fifth lens element is made of plastic;
- wherein a focal length of the image capturing lens assembly is f, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a radius of the curvature of the object-side surface of the third lens element is R5, a radius of the curvature of the object-side surface of the fourth lens element is R7, and they satisfy the following relations:
- 0.15<f/f2<1.0;
- 0.5<f/f3<1.5;
- and
- 0<R5/R7<1.2.
An image capturing lens assembly comprising five lens elements with refractive power, in order from an object side to an image side:
- a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
- a second lens element with positive refractive power having a convex image-side surface;
- a third lens element with positive refractive power having a convex object-side surface;
- a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces thereof being aspheric, at least one inflection point is formed on at least one of the object-side and the image-side surfaces thereof, and the fourth lens element is made of plastic;
- and
- a fifth lens element with positive refractive power, at least one of the object-side and the image-side surfaces thereof being aspheric, and the fifth lens element is made of plastic;
- wherein a focal length of the image capturing lens assembly is f, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the first lens element is f1, and they satisfy the following relations:
- 0.15<f/f2<1.0;
- 0.5<f/f3<1.5;
- and
- 0<|f/f1|−f/f3<0.8.
Dependencies are inferred from the claim text.