Patent ID: 9720215
Date: 2017-08-01
CPC Classifications: G02B

Claim:
1. A zoom lens, comprising: a first lens unit having a negative refractive power, wherein the first lens unit is formed by a single lens; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; a fourth lens unit having a positive refractive power; a fifth lens unit having a positive refractive power; a sixth lens unit having a negative refractive power; and a seventh lens unit having a positive refractive power, wherein the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, the fifth lens unit, the sixth lens unit, and the seventh lens unit are arranged in order from an object side to an image side and are disposed along an optical axis of the zoom lens, a distance between the seventh lens unit and the image side is fixed, and the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, the fifth lens unit and the sixth lens unit are adapted to move along the optical axis and the first lens unit and the second lens unit move in unison between the object side and the image side during zooming such that the distance between the first lens unit and the second lens unit is fixed at all times during zooming, the distance between the first lens unit and the second lens unit is variable during focusing, and the distance between all other adjacent lens units is variable during zooming.