Patent ID: 8582214

Claim:
A lens module, comprising, sequentially from an object with no intervening lenses: a first lens having a positive (+) refractive power; a second lens having a negative (−) refractive power; a third lens having a positive (+) refractive power and having an inflection point at an image surface; and a fourth lens having a negative (−) refractive power; wherein the lens module comprises at least three different zoom positions depending on movement of the first lens, and wherein the lens module satisfies the following conditional expression: 0.7 <f 1 /fz 1 ,f 1 /fz 2 ,f 1 /fz 3<0.9, wherein fz1 is a total focal length at a Tele position of the lens module, fz2 is a total focal length at a Middle position of the lens module, and fz3 is a total focal length at a Wide position of the lens module, wherein f1 is a focal length of the first lens.