Patent ID: 6151171
Filing Date: 2000-11-21
Classification: G02B

Abstract:
A zoom assembly comprising:a zoom lens defining an optical axis, said zoom lens being capable of operating in a plurality of different zoom positions and of focus adjustment for different object distances in each of said zoom positions, said zoom positions being (i) two extreme zoom positions comprising a wide angle position and a telephoto position, and (ii) a plurality of intermediate zoom positions; said zoom lens including at least a first movable lens group and a second movable lens group, said first and said second lens group being separated from one another by a variable distance; wherein said first and said second movable lens groups move(i) together, at the same speed and direction in order to focus at one of said extreme zoom positions and at an adjacent one of said intermediate zoom positions; and(ii) differentially in order to focus at another one of said extreme zoom positions.