Five-piece optical lens system

摘要

A five-piece optical lens system includes, in order from the object side to the image side: a first lens element with a positive refractive power having a convex object-side surface and at least one aspheric surface; a second lens element with a negative refractive power having a concave image-side surface and at least one aspheric surface; a third lens element with a positive refractive power having at least one aspheric surface; a fourth lens element with a positive refractive power having a concave object-side surface and a convex image-side surface, and at least one aspheric surface; a fifth lens element with a negative refractive power having a concave image-side surface and at least one aspheric surface. Thereby, such a system not only can be applied to a high resolution mobile phone, but also has a wide field of view, big stop, high pixel, high resolution and low height.

主权项

1. A five-piece 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 having a convex object-side surface, at least one of the object-side and an image-side surfaces of the first lens element being aspheric; a second lens element with a negative refractive power having a concave image-side surface, at least one of an object-side and the image-side surfaces of the second lens element being aspheric; a third lens element with a positive refractive power, at least one of an object-side and an image-side surfaces of the third lens element being aspheric; a fourth lens element with a positive refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces of the fourth lens element being aspheric; a fifth lens element with a negative refractive power having a concave image-side surface, at least one of an object-side and the image-side surfaces of the fifth lens element being aspheric; wherein a refractive index of the first lens element is N1, an Abbe number of the first lens element is V1, a refractive index of the second lens element is N2, an Abbe number of the second lens element is V2, a focal length of the second lens element is f2, a focal length of the third lens element and the fourth lens element combined is f34, and they satisfy the relations:
0.7<|f2|/f43|<2.7;N1<1.57;V1>40;N2>1.57;V2<40.