Patent ID: 9588324
Date: 2017-03-07
CPC Classifications: G02B

Claim:
1. A zoom lens comprising; a plurality of lens units, wherein the plurality of lens units comprises in order from an object side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a negative refractive power; and a rearmost lens unit having a negative refractive power which is disposed on an image side of the third lens unit; wherein the rearmost lens unit is positioned nearest to an image in the plurality of lens units, and further comprises an aperture stop, and at the time of zooming from a wide angle end to a telephoto end, distances between the lens units change, and the first lens unit and the aperture stop move toward the object side, and at the time of focusing from an infinite object point to an object point at a close distance, only the third lens unit moves, and the following conditional expressions are satisfied where, β β f f D ω S where, β β f