Patent ID: 8582214
Filing Date: 2013-11-12
Classification: G02B

Abstract:
1. 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: 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.