Patent ID: 8665530
Filing Date: 2014-03-04
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from the object side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a negative refractive power; and a sixth lens group having a positive refractive power, wherein: during zooming from the wide angle end to the telephoto end, the first lens group, the third lens group, and the sixth lens group are fixed, the second lens group, the fourth lens group, and the fifth lens group move, the first lens group comprises a reflecting optical element that bends the optical path, the second lens group comprises, in order from the object side, a negative lens and a cemented lens made up of a negative lens and a positive lens, the third lens group comprises an aperture stop, the fourth lens group comprises, in order from the object side, a positive lens and a negative lens, the fifth lens group comprises a negative lens, and the zoom lens satisfies the following conditional expressions (1) and (2): where f1 is the focal length of the first lens group, fw is the focal length of the entire zoom lens system at the wide angle end, ft is the focal length of the entire zoom lens system at the telephoto end, pri is the thickness of the reflecting optical element, and IH is the largest image height on the image plane.