Patent ID: 7630143
Filing Date: 2009-12-08
Classification: G02B

Abstract:
1. A zoom lens comprising a first lens group, a second lens group, a third lens group and a fourth lens groups in order from an object side, so as to change magnification by changing a spacing between the lens groups, wherein the first lens group has a positive refractive power as a whole and comprises, in order from the object side, a negative meniscus lens, a reflecting member that bends an optical path nearly 90 degrees and a positive lens of a resin material having at least one aspheric surface; the second lens group has a negative refractive power as a whole and comprises a negative lens of a resin material on an most object side of the second lens group; the third lens group has a positive lens having a convex surface directed to the object side; and the fourth lens group has a positive refractive power as a whole and comprises an aspheric lens having at least one aspheric surface; wherein a conditional expression given below is satisfied; where P P