Patent ID: 7688532
Filing Date: 2010-03-30
Classification: G02B

Abstract:
1. A lens system comprising, in order from the object side: a first lens comprising a first optical portion and a first mounting portion surrounding the first optical portion; and a second lens comprising a second optical portion with a concave object side surface aligned with the first optical portion along an optical axis of the lens system, and a second mounting portion surrounding the second optical portion, the second mounting portion comprising a connecting surface surrounding an object side surface of the second optical portion, wherein the lens system satisfies the following condition: wherein, D1 is the semi-diameter of the object side surface of the second optical portion, T is a distance from an image side surface of the first optical portion to the object side surface of the second optical portion along the axis of the lens system, and α is an angle formed between the connecting surface and the axis of the lens system.