Patent ID: 7333274
Filing Date: 2008-02-19
Classification: G02B

Abstract:
1. A image taking apparatus equipped with a zoom lens system which comprises, in order from an object side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, wherein at least the first lens unit, the second lens unit, and the third lens unit move during zooming from a wide-angle end to a telephoto end so that a space between the first lens unit and the second lens unit increases, a space between the second lens unit and the third lens unit decreases, and a space between the third lens unit and the fourth lens unit increases, the first lens unit includes a single lens component or a cemented lens component, and is arranged closer to an image side in the wide-angle end than in the telephoto end, the third lens unit includes, in order from the object side, a positive lens element, a positive lens element, and a negative lens element, the number of lens component included in the first lens unit is one, and the number of lens components included in the third lens unit is three in total, and the zoom lens system satisfies the following conditions:  wherein IH denotes an image height, fr denotes a focal length of the zoom lens system, d