Patent ID: 7339749
Filing Date: 2008-03-04
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from an object side to an image side thereof, a first lens unit having negative refracting power, a second lens unit having positive refracting power, and a third lens unit having positive refracting power, with a space between adjacent lens units varied for zooming, wherein: the first lens unit consists of one positive lens and one negative lens, the second lens unit consists of two positive lenses and one negative lens, and the third lens unit consists of one positive lens, and satisfies the following condition: where R 1 is an axial radius of curvature of an object-side surface of the positive lens in the third lens unit, and R 2 is an axial radius of curvature of an image-side surface of the positive lens in the third lens unit, wherein the first lens unit is located in the most object side in all lens units included in the zoom lens.