Image capturing lens system

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, a fourth lens element and a fifth lens element. The positive first lens element has a convex object-side surface at a paraxial region. Both of the positive second lens element and the negative third lens element have a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The positive fourth lens element has a convex image-side surface at a paraxial region. The fifth lens element has a concave image-side surface at a paraxial region, wherein the surfaces thereof are aspheric, and the image-side surface of the fifth lens element has at least one convex shape at an off-axis region. The image capturing lens system has a total of five 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 object-side surface at a paraxial region; a second lens element with positive refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a third lens element with negative refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a fourth lens element with positive refractive power having a convex image-side surface at a paraxial region; and a fifth lens element with refractive power having a concave image-side surface at a paraxial region, wherein both of an object-side surface and the image-side surface of the fifth lens element are aspheric, and the image-side surface of the fifth lens element has at least one convex shape at an off-axis region; wherein the image capturing lens system has a total of five lens elements with refractive power, a focal length of the image capturing lens system is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, and the following relationships are satisfied:
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