Patent ID: 9128276
Filing Date: 2015-09-08
Classification: G02B

Abstract:
1. An optical imaging system comprising, in the order from an object side to an image side: a first lens element with positive refractive power comprising an object-side surface, and an image-side surface, wherein the object-side surface and the image-side surface of the first lens element are aspheric; a second lens element comprising an object-side surface and an image-side surface, wherein the object-side surface and the image-side surface of the second lens element are aspheric; a third lens element comprising an object-side surface and an image-side surface, wherein the object-side surface and the image-side surface of the third lens element are aspheric; a fourth lens element comprising an object-side surface and an image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric, and the fourth lens element is made of plastic; and a fifth lens element comprising an object-side surface and a concave image-side surface, wherein the image-side surface of the fifth lens element comprises at least one inflection point, and the object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element is made of plastic, wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are singlet lens elements, an air gap is formed on an optical axis between every two lens elements adjacent to each other among the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element, the optical imaging system further comprises a stop, Td is an axial distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element, SL is an axial distance from the stop to an image plane, TTL is an axial distance from the object-side surface of the first lens element to the image plane, and the optical imaging system satisfies the following conditions: