Image capturing lens system, imaging device and mobile terminal

摘要

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

主权项

1. An image capturing lens system comprising, in order from an object side to an image side:
a first lens element with positive refractive power having a convex image-side surface in a paraxial region thereof; a second lens element having negative refractive power; a third lens element with positive refractive power having a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof; and a fourth lens element with refractive power having a concave image-side surface in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric, and the image-side surface of the fourth lens element has at least one convex shape in an off-axis region thereof; wherein the image capturing lens system has a total of four lens elements with refractive power, an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, an Abbe number of the second lens element is V2, an Abbe number of the fourth lens element is V4, an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is Td, an axial distance between the object-side surface of the first lens element and an image plane is TL, a maximum image height of the image capturing lens system is ImgH, and the following conditions are satisfied:
1.75<(V1+V3)/(V2+V4)<3.5;0.50 mm