Patent ID: 8089702
Filing Date: 2012-01-03
Classification: G02B

Abstract:
1. A zoom lens comprising: a first lens group including a first lens, a right-angle prism, and a second lens in that order from the object side, the first lens being a single lens having a negative refractive power, the right-angle prism bending an optical path, the second lens including at least a lens having a positive refractive power, the first lens group having a positive refractive power; a second lens group arranged at the image plane side of the first lens group and including a third lens, a fourth lens, a fifth lens, and a sixth lens in that order from the object side, the third lens including an aspherical surface and having a negative refractive power, the fourth lens having a negative refractive power, the fifth lens having a positive refractive power, the sixth lens having a negative refractive power, the second lens group having a negative refractive power, the second lens group being moved in an optical-axis direction during zooming; a third lens group arranged at the image plane side of the second lens group, the third lens group having a positive refractive power; and a fourth lens group arranged at the image plane side of the third lens group, the fourth lens group having a positive refractive power, the fourth lens group being moved in the optical-axis direction during zooming.