Patent ID: 8605364
Filing Date: 2013-12-10
Classification: G02B

Abstract:
1. A zoom lens, comprising a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and an image surface in sequence along an optical axis from an object side to an image side; the first lens group having positive refractive power, and including at least two lenses, wherein one of the lenses has negative refractive power, and one of the lenses has positive refractive power; the second lens group having negative refractive power, and including three lenses, wherein one of the lenses has positive refractive power, and the rest two lenses have negative refractive power; the third lens group having positive refractive power, and including at least two lenses, wherein one of the lenses has negative refractive power, and one of the lenses has positive refractive power; the fourth lens group having positive refractive power; wherein the zoom lens is switched to a telephoto mode from a wide-angle mode by moving the first lens group toward the object side, moving the second lens group toward the image side, and moving the third lens group toward the object side; and wherein the lenses of the second lens group from the object side to the image side respectively have negative refractive power, positive refractive power, and negative refractive power.