Patent ID: 6061186
Filing Date: 2000-05-09
Classification: G02B

Abstract:
A zoom lens comprising, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power, and a fifth lens unit of negative refractive power,wherein, during zooming from a wide-angle end to a telephoto end, at least said first, third, fourth, and fifth lens units are axially moved independently toward the object side in such a manner that a separation between said first lens unit and said second lens unit increases and a separation between said second lens unit and said third lens unit decreases, andwherein only said fifth lens unit is axially moved toward the image side to effect focusing from an infinitely distant object to a closest object.