Patent ID: 7242529
Filing Date: 2007-07-10
Classification: G02B

Abstract:
1. A zoom lens comprising: a first lens group having a positive refractive power and statically positioned along an optical axis when a power of the zoom lens is varied or the zoom lens is focused; 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, wherein the first to fifth lens groups are arranged along the optical axis in this order from an object side of the zoom lens, the second lens group and the fourth lens group are moved for varying the power of the zoom lens, the fourth lens group is further moved for focusing the zoom lens, the first lens group comprises a reflective optical element for bending an optical path, the second lens group comprises a cemented lens including a positive lens and a negative lens, the fourth lens group comprises two positive lenses, the fifth lens group consists of one positive lens having at least one aspherical surface, and the third lens group consists of: