Patent ID: 6229962
Filing Date: 2001-05-08
Classification: G02B

Abstract:
A zoom lens comprising, in order from an object side:a first lens unit with a positive refracting power;a second lens unit with a negative refracting power;a third lens unit with a negative refracting power; anda fourth lens unit with a positive refracting power,each of said second lens unit, said third lens unit, and said fourth lens unit being moved independently along an optical axis when a magnification of said zoom lens is changed, ranging from a wide-angle position to a telephoto position of said zoom lens,wherein said zoom lens satisfies the following conditions:D.sub.i /f.sub.w >0.65.beta..sub.2w >-0.35where D.sub.i is a maximum image height of said zoom lens, f.sub.w is a focal length of said zoom lens at the wide-angle position, and .beta..sub.2w is a lateral magnification of said second lens unit at the wide-angle position of said zoom lens.