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 stop, a first lens element with a positive refractive power has a convex image-side surface and at least one aspheric surface; a second lens element with a negative refractive power has a convex object-side surface and at least one aspheric surface; a third lens element has a concave image-side surface and at least one aspheric surface; a fourth lens element with a positive refractive power has a convex object-side surface and at least one aspheric surface, and a fifth lens element with a negative refractive power has a concave object-side surface and at least one aspheric surface. Thereby, such a system can be applied to a high resolution mobile phone.

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 image-side surface, at least one of an object-side and the image-side surfaces of the first lens element being aspheric; a second lens element with a negative refractive power having a convex object-side surface, at least one of the object-side and an image-side surfaces of the second lens element being aspheric; a third lens element 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; and a fourth 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 fourth lens element being aspheric; and a fifth lens element with a negative refractive power having a concave object-side surface, at least one of the object-side and an image-side surfaces of the fifth lens element being aspheric; wherein a focal length of the first lens element is f1, a focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: −0.9