Patent ID: 7149038

Claim:
A zoom lens assembly comprising: an object end; an image end; a first lens group having a positive focal length, the first lens group being stationary when the zoom lens assembly is zooming; a second lens group having a negative focal length, the second lens group moving from the object end to the image end when the zoom lens assembly is zooming and operating from a periscopic mode to a telescopic mode; a third lens group having a positive focal length, the third lens group moving from the image end to the object end when the zoom lens assembly is zooming and operating from the periscopic mode to the telescopic mode; and a fourth lens group having a positive focal length, the fourth lens group moving from the image end to the object end when the zoom lens assembly is zooming and operating from the periscopic mode to the telescopic mode; wherein the first, second, third and fourth lens group are disposed in sequence from the object end to the image end, and the zoom lens assembly satisfies the following conditions: 18< T÷H< 25, 0.15<( H 11× fw )÷( H×ft )<0.55, 0.5< t 31÷ T 31<1.0, and 50< f 3× T 31<105, where H is a height of an image captured by the zoom lens assembly, T is a total length of the zoom lens assembly, H11 is a diameter of a first lens of the first lens group, ft is an equivalent focal length of the zoom lens assembly when the zoom lens assembly is operating in the telescopic mode, fw is an equivalent focal length of the zoom lens assembly when the zoom lens assembly is operating in the periscopic mode, t31 is a thickness of an edge region of a first lens of the third lens group, T31 is a thickness of a central region of the first lens of the third lens group, and f3 is an equivalent focal length of the third lens group.