Patent ID: 6650475
Filing Date: 2003-11-18
Classification: G02B

Abstract:
A variable power optical system comprising, in order from an object side:a first lens unit having a positive refracting power and consisting of one of (a) a positive singlet lens or (b) the combination of one positive lens and one negative lens; a second lens unit having a negative refracting power; a third lens unit having a positive refracting power; and a fourth lens unit having a positive refracting power, wherein at least the second lens unit and the third lens unit are moved during variation of magnification, and an image is displaced by shifting any one of the entire second lens unit and the entire third lens unit so as to have a component in a direction orthogonal to the optical axis, and wherein the third lens unit consists of, in order from the object side, a positive lens, a bonded lens, and a positive lens.