Zoom lens and imaging apparatus including the same
AssigneeCanon Kabushiki Kaisha
InventorKohei Kimura
Life of this patent
Estimating the term…
Abstract
A zoom lens comprises a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear lens group including one or more lens units. The first lens unit, the second lens unit, the rear lens group are arranged in order from an object side to an image side. Intervals between adjacent lens units change during zooming. The first lens unit is configured to move toward the object side during zooming from a wide angle end to a telephoto end. The second lens unit includes three or more lenses. The zoom lens satisfies predetermined inequalities.
Claims22
A zoom lens comprising a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear lens group including one or more lens units, the first lens unit, the second lens unit, and the rear lens group being arranged in order from an object side to an image side,
- wherein intervals between adjacent lens units change during zooming,
- wherein the first lens unit is configured to move toward the object side during zooming from a wide angle end to a telephoto end,
- wherein the second lens unit includes three or more lenses, and
- wherein the following inequalities are satisfied:
- 4.3<TD12t/TG12<12.0, and
- 3.6<TD1/TD2<30.0,
- where TD12t is a distance on an optical axis from a lens surface arranged closest to the object side in the first lens unit to a lens surface arranged closest to the image side in the second lens unit at the telephoto end, TG12 is a total sum of thicknesses, on the optical axis, of lenses included in the first lens unit and the second lens unit, TD1 is a distance on the optical axis from the lens surface arranged closest to the object side in the first lens unit to a lens surface arranged closest to the image side in the first lens unit, and TD2 is a distance on the optical axis from a lens surface arranged closest to the object side in the second lens unit to the lens surface arranged closest to the image side in the second lens unit.
An imaging apparatus comprising:
- a zoom lens comprising a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear lens group including one or more lens units, the first lens unit, the second lens unit, and the rear lens group being arranged in order from an object side to an image side,
- wherein intervals between adjacent lens units change during zooming,
- wherein the first lens unit is configured to move toward the object side during zooming from a wide angle end to a telephoto end,
- wherein the second lens unit includes three or more lenses, and
- wherein the following inequalities are satisfied:
- 4.3<TD12t/TG12<12.0, and
- 3.6<TD1/TD2<30.0,
- where TD12t is a distance on an optical axis from a lens surface arranged closest to the object side in the first lens unit to a lens surface arranged closest to the image side in the second lens unit at the telephoto end, TG12 is a total sum of thicknesses, on the optical axis, of lenses included in the first lens unit and the second lens unit, TD1 is a distance on the optical axis from the lens surface arranged closest to the object side in the first lens unit to a lens surface arranged closest to the image side in the first lens unit, and TD2 is a distance on the optical axis from a lens surface arranged closest to the object side in the second lens unit to the lens surface arranged closest to the image side in the second lens unit;
- and
- an image sensor configured to receive an optical image formed by the zoom lens.
Dependencies are inferred from the claim text.