Patent ID: 8699144
Filing Date: 2014-04-15
Classification: G02B

Abstract:
1. An optical zoom lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprising: a first lens-group, with negative refractive power, and including at least one positive lens and at least one negative lens; a second lens-group, with positive refractive power, and including at least one positive lens and at least one negative lens; and a third lens-group, with positive refractive power, and including at least one aspheric lens; wherein each lens of the first lens-group, the second lens-group and the third lens-group has refractive index smaller than 1.69; and the second lens-group has a focal length of f wherein the second lens-group, sequentially arranged from the object side to the image side along the optical axis comprises the third lens, a fourth lens and a fifth lens; the third lens with positive refractive power has a convex object-side surface and a convex image-side surface; the fourth lens with negative refractive power has a concave object-side surface and a concave image-side surface; and the fifth lens with negative refractive power has a convex object-side surface and a concave image-side surface.