Patent ID: 8896931
Filing Date: 2014-11-25
Classification: G02B

Abstract:
1. A zoom lens, comprising: a first lens group having a positive refracting power and positioned at a fixed position; a second lens group having a negative refracting power and movable in a direction of an optical axis for zooming; a third lens group having a positive refracting power and positioned at a fixed position; and a fourth lens group movable in the direction of the optical axis and being disposed on the image side of the third lens group, the fourth lens group configured from a positive lens having a positive refracting power and a negative lens having a negative refracting power, the positive lens and the negative lens being disposed in this order from the object side to the image side, the first, second and third lens groups being disposed in order from the object side to the image side; two thirds or more lenses from among a number of lenses which configure the first to third lens groups being formed from a resin material; one of the positive lens and negative lens, in the fourth lens group, is formed from a glass material and the other one of the lenses is formed from a resin material; the zoom lens satisfying the following conditional expressions (1) and (2): where fw is a focal length of the entire lens system in a wide angle end state, ft a focal length of the entire lens system in a telephoto end state, and f(1 to 3) is a combined focal length of the first to third lens groups at all zoom positions.