Patent ID: 7505210
Filing Date: 2009-03-17
Classification: G02B

Abstract:
1. A zoom lens having a first lens group fixed upon zooming and 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 negative refractive power, and a fifth lens group having a positive refractive power, which are successively arranged in this order from an object side, wherein the third lens group is fixed and at least the second lens group and the fourth lens group are moved for zooming, wherein the fourth lens group moved in one linear direction when the second and fourth lens groups are moved for zooming, and wherein said first lens group comprises a first single lens having a negative refractive power, a reflective member for bending an optical path through 90°, and at least one second lens having a positive refractive power, which are successively arranged in this order from the object side.