Patent ID: 6633437
Filing Date: 2003-10-14
Classification: G02B

Abstract:
A zoom lens comprising the following lens components in the order named from the object side:a front lens component of a negative optical power in the entire zoom range, said front lens component having a first lens unit of a positive optical power and a second lens unit of a negative optical power in the order named from the object side; and a rear lens component of a positive optical power in the entire zoom range, said rear lens component having a third lens unit of a positive optical power and a fourth lens unit of a positive optical power in the order named from the object side; said zoom lens varying a spacing between principal points of said front lens component and rear lens component by varying a spacing between said first lens unit and said second lens unit and a spacing between said third lens unit and said fourth lens unit, in order to effect zooming, and wherein said first lens unit and said fourth lens unit change their moving direction during zooming from the wide-angle end to the telephoto end.