Patent ID: 8184376

Claim:
A three unit zoom lens comprising, in order from its object side: a first lens unit having a negative refracting power; a second lens unit having a positive refracting power; and a third lens unit having a positive refracting power, wherein during zooming from the wide angle end to the telephoto end, the second lens unit moves, the distance between the first lens unit and the second lens unit decreases, and the distance between the second lens unit and the third lens unit increases, when a lens component is defined as a lens member whose surfaces that are in contact with air on an optical axis include only two surfaces, one being an object side surface and the other being an image side surface, the second lens unit comprises, in order from the object side, a front lens component having an object side lens surface convex toward the object side and having a positive refracting power and a rear lens component having an image side lens surface concave toward the image side, the total number of lens components included in the second lens unit is two, the third lens unit comprises, in order from the object side, a front lens component having an object side lens surface concave toward the object side and a rear lens component having a image side lens surface convex toward the image side and having a positive refracting power, and the total number of lens components included in the third lens unit is two, and the three unit zoom lens comprises an aperture stop disposed closer to the image side than the first lens unit and closer to the object side than the rear lens component in the second lens unit, and the aperture stop moves integrally with the second lens unit along the optical axis direction during zooming from the wide angle end to the telephoto end.