Patent ID: 11860348
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A zoom lens comprising, in order from an object side to an image side:
a first lens unit having a positive refractive power;
a second lens unit having a negative power; and
a rear unit having a positive refractive power as a whole and including one or more lens units,
wherein a distance between adjacent lens units changes during zooming,
wherein the first lens unit consists of a first subunit having a positive refractive power and a second subunit disposed on the image side of the first subunit,
wherein the first subunit and the second subunit are separated by largest air interval in the first lens unit,
wherein the first subunit includes a first positive lens,
wherein the second subunit includes a second positive lens and a first negative lens,
wherein the first positive lens is a lens having the smallest absolute value of a focal length among lenses included in the first subunit,
wherein the first negative lens is a lens having the smallest absolute value of a focal length among negative lenses included in the second subunit, and
wherein the following inequalities are satisfied:

0.10<d11/f11<0.50

0.6<f11/f1<2.0

−8.0<f1/f2<−2.5, where d11 is a distance on an optical axis from the first subunit to the second subunit, f11 is a focal length of the first subunit, f1 is a focal length of the first lens unit, and f2 is a focal length of the second lens unit.