Patent ID: 7233447
Filing Date: 2007-06-19
Classification: G02B

Abstract:
1. A zoom lens for receiving light modulated by an image display located on the short conjugate length side of the zoom lens and for projecting the modulated light to the long conjugate length side of the zoom lens, the zoom lens comprising, in order from the long conjugate length side of the zoom lens: a first lens group having negative refractive power and including at least one aspheric surface; a second lens group having positive refractive power, that includes at least two lens components, and that moves during zooming; a third lens group that moves during zooming; a fourth lens group having positive refractive power that moves during zooming; a fifth lens group that moves during zooming; and a sixth lens group; wherein a stop is arranged between the third lens group and the fourth lens group, the fifth lens group has positive refractive power, and the following condition is satisfied: where Ft is the focal length of the zoom lens at the telephoto end when the zoom lens is focused at infinity on the long conjugate length side, and Fw is the focal length of the zoom lens at the wide-angle end when the zoom lens is focused at infinity on the long conjugate length side.