Patent ID: 6862143
Filing Date: 2005-03-01
Classification: G02B

Abstract:
1. A zoom lens, comprising, in order from an object side to an image side: a first lens unit of negative optical power, said first lens unit including a negative lens element and a positive lens element; a second lens unit of positive optical power, said second lens unit consisting of a cemented lens and a biconvex lens element; and a third lens unit of positive optical power, said third lens unit including a positive lens element, wherein a separation between said first lens unit and said second lens unit and a separation between said second lens unit and said third lens unit are varied by causing said first lens unit, said second lens unit, and said third lens unit to move during zooming, wherein said first lens unit is the most object side lens unit of said zoom lens, and wherein no lens unit is present between said second lens unit and said third lens unit.