Patent ID: 8743484
Filing Date: 2014-06-03
Classification: G02B

Abstract:
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: