Patent ID: 8270090
Filing Date: 2012-09-18
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from the object side thereof: a first lens unit having a positive refracting power; a second lens unit having a negative refracting power; a third lens unit having a positive refracting power; a fourth lens unit having a positive refracting power; and a fifth lens unit having a negative refracting power, wherein during zooming from the wide angle end to the telephoto end, the first lens unit and the third lens unit are kept stationary with respect to an image plane, and at least the second lens unit and the fourth lens unit move, the first lens unit comprises, in order from the object side, a first sub unit having a negative refracting power, a reflecting optical element that bends an optical path by reflection, and a second sub unit having a positive refracting power, and the second sub unit comprises a cemented lens; wherein the cemented lens in the second sub unit having a positive refracting power has an aspheric cemented surface.