Patent ID: 9716829
Date: 2017-07-25
CPC Classifications: G02B,H04N

Claim:
1. A zoom lens comprising, from an object side to an image side, a first magnification-varying group, an aperture stop and a second magnification-varying group, the first magnification-varying group comprising, from the object side to the image side: a first lens unit having a positive refractive power configured not to move for zooming; a second lens unit having a negative refractive power configured to move during zooming; and one or more magnification-varying lens units configured to move during zooming, the one or more magnification-varying lens units having a positive combined refractive power, the second magnification-varying group comprising, from the object side to the image side: a first sub lens unit having a negative refractive power configured not to move for zooming; a second sub lens unit having a negative refractive power configured to move during zooming; and a third sub lens unit having a positive refractive power, the second magnification-varying group moving the second sub lens unit from the object side to the image side to displace a focal length range of the zoom lenses toward a long focal length side.