Patent ID: 8724238
Filing Date: 2014-05-13
Classification: G02B

Abstract:
1. A monofocal optical lens system comprising, in order from an object side to an image side: 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 refractive power, wherein at least one of an object-side surface and an image-side surface of the third lens element is aspheric; a fourth lens element with negative refractive power made of plastic material, and having a concave object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric; and a fifth lens element with refractive power made of plastic material, and having a concave object-side surface, wherein the object-side surface and an image-side surface of the fifth lens element are aspheric, the image-side surface of the fifth lens element is convex or planar at a paraxial region and is convex at a peripheral region; wherein the monofocal optical lens system further comprises a stop, an axial distance between the object-side surface of the first lens element and the stop is Dr