Patent ID: 7136232

Claim:
A miniature zoom lens, comprising, sequentially from an object side toward an image forming side: a first lens group having negative refractive power, a second lens group having positive refractive power and including a diaphragm, and a third lens group having positive refractive power; wherein: said first lens group comprises a single negative lens; said second lens group comprises, sequentially from the object side, a single positive lens and a single negative lens; said third lens group comprises a single positive lens; said first lens group is immovable; said second lens group and said third lens group move in an optical axis direction at variable power; the negative lens of said first lens group is a meniscus lens having at least one aspherical surface, and a respective largest curvature surface facing the object side; the positive lens of said second lens group includes at least one aspherical surface, and the negative lens of said second lens group includes at least one aspherical surface; and the positive lens of said third lens group has a respective largest curvature surface facing the image-forming side.