Patent ID: 9201224
Filing Date: 2015-12-01
Classification: G02B

Abstract:
1. A projector zoom lens comprising: a first lens group having a negative refractive power, comprising a second lens group having a positive refractive power, comprising the projector zoom lens is comprised of 8 lenses or less; lens diameters of the first front group, first rear group, second front group, and second rear group are decreased stepwise from a most enlargement-side lens to a most reduction-side lens; when zooming from a wide-angle end to a telephoto end, the first lens group is moved towards a reduction side while the second lens group is moved towards an enlargement side; and where F 2 is a focal length of the second lens group, f 21 is a focal length of the second front group, and f 22 is a focal length of the second rear group.