Patent ID: 9341815
Filing Date: 2016-05-17
CPC Classification: G02B,H04N

Claim Text:
1. An optical imaging system comprising, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, wherein both of the object-side surface and the image-side surface of the first lens element are aspheric, and the first lens element is made of plastic material; a second lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, wherein both of the object-side surface and the image-side surface of the second lens element are aspheric, and the second lens element is made of plastic material; and a third lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the third lens element has at least one convex shape in an off-axis region thereof, both of an object-side surface and the image-side surface of the third lens element are aspheric, and the third lens element is made of plastic material; wherein the optical imaging system has a total of three lens elements with refractive power which are the first lens element, the second lens element and the third lens element, the optical imaging system further comprises a stop located between the image-side surface of the first lens element and the object-side surface of the second lens element; wherein a focal length of the first lens element is f