CAMERA OBJECTIVE LENS WITH INFRARED FILTER AND CAMERA MODULE WITH CAMERA OBJECTIVE LENS

摘要

PURPOSE: A camera objective lens with an infrared filter and a camera module with the camera objective lens are provided to design the optical system of the camera module even more compact without sacrificing the infrared filter while improving the optical properties of camera modules. CONSTITUTION: A lens system (1) for a camera module (3) is an achromatic lens system having two lenses. A first lens (5) has a positive focal length. A second lens (7) has a negative focal length. The first lens is made of glass containing copper ions which absorbs infrared light and functions as an infrared filter. The second lens has an Abbe number which is smaller than an Abbe number of the first lens.