Image capturing lens system

摘要

This invention provides an image capturing lens system comprising three non-cemented lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface, and both the object-side and image-side surfaces being aspheric; a plastic second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, and both the object-side and image-side surfaces being aspheric; and a plastic third lens element having a convex object-side surface and a concave image-side surface, and both the object-side and image-side surfaces being aspheric. By such arrangement, the space of the image capturing lens system can be allocated much more properly and thereby an image capturing lens system with shorter total track length can be obtained while retaining superior image quality.

主权项

1. An image capturing lens system, in order from an object side to an image side comprising three non-cemented lens elements with refractive power:
a first lens element with positive refractive power having a convex object-side surface, and both the object-side and image-side surfaces being aspheric; a plastic second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, and both the object-side and image-side surfaces being aspheric; and a plastic third lens element with refractive power having a convex object-side surface and a concave image-side surface, and both the object-side and image-side surfaces being aspheric; wherein the shape of the image-side surface of the third lens element changes from concave at the paraxial region thereof to convex while away from the paraxial region; wherein the image capturing lens system comprises a stop positioned between an imaged object and the image-side surface of the first lens element; wherein a total axial distance of the air intervals between the object-side surface of the first lens element and an image plane is ΣAT, an axial distance between the object-side surface of the first lens element and the image plane is TL, an axial distance between the stop and the image-side surface of the first lens element is SR2, a central thickness of the first lens element is CT1, and they satisfy the following relations:
0.10 mm<ΣAT<0.65 mm;0.10<ΣAT/TL<0.35; and0.65