US 9,001,434 B2Granted

Imaging lens system and image capturing device

AssigneeLargan Precision Co., Ltd.

InventorsKuan-Ming Chen, Wei-Yu Chen

Life of this patent

Estimating the term…

Loading patent…

Abstract

An imaging lens system includes six non-cemented lens elements with refractive power, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element has refractive power. The fifth lens element has refractive power, wherein both of the surfaces thereof are aspheric. The sixth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface has at least one convex shape in an off-axis region thereof, and both of the surfaces thereof are aspheric. The imaging lens system has a total of six lens elements with refractive power.

Claims24

Dependent claims

An imaging lens system comprising six non-cemented lens elements with refractive power, in order from an object side to an image side:

a first lens element having positive refractive power;
a second lens element having refractive power;
a third lens element having positive refractive power,
a fourth lens element having refractive power;
a fifth lens element having refractive power, wherein both of an object-side surface and an image-side surface of the fifth lens element are aspheric;
and
a sixth lens element with refractive power having a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the sixth lens element having at least one convex shape in an off-axis region thereof, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric;
wherein the imaging lens system has a total of six lens elements with refractive power, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, a central thickness of the first lens element is CT1, and an axial distance between the first lens element and the second lens element is T12, the following relationships are satisfied:
0<f3/f1<1.1;
|R9/R10|<3.0;
and
0.90<T12/CT1<3.0.

9 more elements

An imaging lens system comprising six non-cemented lens elements with refractive power, in order from an object side to an image side:

a first lens element having positive refractive power;
a second lens element having negative refractive power;
a third lens element having positive refractive power;
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 a convex object-side surface, wherein both of the object-side surface and an image-side surface of the fifth lens element are aspheric;
and
a sixth lens element with refractive power having a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the sixth lens element having at least one convex shape in an off-axis region thereof, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric;
wherein the imaging lens system has a total of six lens elements with refractive power, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, a curvature radius of the object-side surface of the sixth lens element is R11, a curvature radius of the image-side surface of the sixth lens element is R12, and the following relationships are satisfied:
0<f3/f1<1.1;
|R9/R10|<3.0;
and
−1.0<(R11+R12)/(R11−R12)<2.75.

9 more elements

Dependencies are inferred from the claim text.