LENS SYSTEM USED IN HANDHELD TERMINAL FOR CORRECTING DISTORTION OF OPTICAL SYSTEM AND MINIATURIZING SIZE

摘要

PURPOSE: A lens system used in handheld terminal is provided to correct distortion of optics and miniaturize a size of lens system by installing an aperture stop between predetermined lens groups. CONSTITUTION: A first lens group(100) is formed with a first lens(110) having a positive refractive index and a second lens(120) having a negative refractive index. An aperture stop(200) is used for preventing unnecessary incident light. A second lens group(300) is formed with a third lens(310) having the positive refractive index and a fourth lens(320) having the negative refractive index. An IR filter(400) is used for filtering IR wavelengths to protect an image plane. The aperture stop is installed between the first lens group and the second lens group.