Patent ID: 9523841
Filing Date: 2016-12-20
CPC Classification: G02B

Claim Text:
1. A photographing optical lens system comprising, in order from an object side to an image side: a first lens element; a second lens element having positive refractive power; a third lens element; a fourth lens element; a fifth lens element; a sixth lens element; a seventh lens element; and an eighth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side of the eighth lens element has at least one convex shape in an off-axis region thereof, and both an object-side surface and the image-side surface of the eighth lens element are aspheric; wherein the photographing optical lens system has a total of eight lens elements; there is an air gap in a paraxial region between every two of the lens elements that are adjacent to each other; wherein an axial distance between an object-side surface of the first lens element and the image-side surface of the eighth lens element is Td, a focal length of the photographing optical lens system is f, a vertical distance between a non-axial critical point on the image-side surface of the eighth lens element and an optical axis is Yc82, and the following conditions are satisfied: