Optical lens system

摘要

An optical lens system, sequentially arranged from an object side to an image side along an optical axis, includes: a stop, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power, a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, and a fourth lens element with negative refractive power having a concave image-side surface with both being aspheric. Furthermore, the optical lens system satisfies conditions related to increase the field of view and reduce the total length as well as the sensitivity of assembly tolerance of the optical lens system.

主权项

1. An optical lens system, comprising, in order from an object side to an image side:
a stop; a first lens element with a positive refractive power made of plastic having a convex object-side surface; a second lens element with a negative refractive power made of plastic having an aspheric object-side surface and an aspheric image-side surface; a third lens element with a positive refractive power made of plastic having a concave object-side surface and a convex image-side surface; a fourth lens element with a refractive power made of plastic having an aspheric object-side surface and an aspheric concave image-side surface, and at least one inflection point being formed on at least one of the object-side surface and the image-side surface of the fourth lens element; wherein a focal length of the first lens element is f1, a focal length of the optical lens system is f, a maximum effective diameter of the image-side surface of the third lens element is CA_L3S2, a maximum effective diameter of the image-side surface of the fourth lens element is CA_L4S2; and they satisfy the conditions:
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