Patent ID: 6166863
Filing Date: 2000-12-26
Classification: G02B

Abstract:
A zoom lens capable of forming an image of an object and zooming between a maximum wide-angle state and a maximum telephoto state, the zoom lens comprising objectwise to imagewise:a) a first lens group having overall positive refractive power;b) a second lens group having overall negative refractive power and separated from said first lens group by a first air space;c) a third lens group having overall negative refractive power and separated from said second lens group by a second air space;d) a fourth lens group having overall positive refractive power and separated from said third lens group by a third air space; ande) a fifth lens group having positive refractive power and separated from said fourth lens group by a fourth air space;f) a sixth lens group having negative refractive power and separated from said fifth lens group by a fifth air space;g) wherein the zoom lens is designed such that when zooming from the maximum wide-angle state to the maximum telephoto state, at least said second lens group moves imagewise and said sixth lens group moves objectwise so as to increase said first and second air spaces, decrease said third and fourth air spaces, and change said fifth air space.