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US 11,635,602 B2Granted
Zoom lens and imaging apparatus including the same
AssigneeCanon Kabushiki Kaisha
InventorShinya Okuoka
Life of this patent
Estimating the term…
Abstract
A zoom lens includes a first lens unit having negative refractive power, a second lens unit having positive refractive power, an intermediate unit including one or more lens units, and a final lens unit having positive refractive power disposed closest to the image side. The first lens unit includes negative lenses G1, G2 and G3 disposed in this order from an object side to an image side. The final lens unit includes at least one negative lens and a positive lens disposed closest to the image side. The zoom lens satisfies predetermined inequalities.
Claims18
A zoom lens comprising:
- a first lens unit having negative refractive power;
- a second lens unit having positive refractive power;
- an intermediate unit including one or more lens units;
- and
- a final lens unit having positive refractive power disposed closest to an image side,
- the first lens unit, the second lens unit, the intermediate unit, and the final lens unit being disposed in this order from an object side to the image side,
- intervals between adjacent lens units being changed during zooming,
- wherein the first lens unit includes a negative lens G1, a negative lens G2, and a negative lens G3 disposed in this order from the object side to the image side,
- wherein the final lens unit includes a negative lens LA and a positive lens GR disposed closest to the image side, and
- wherein the following inequalities are satisfied:
- 0.000<θgFGR−(−1.665*10−7*νdGR3+5.213*10−5*νdGR2−5.656*10−3*νdGR+0.7278)<0.100,
- 0.50<bfw/fw<1.50,
- −1.00<fw/f1<−0.55, and
- −0.90<bfw/f1<−0.40,
- where vdGR is an Abbe number of the positive lens GR, θgFGR is a partial dispersion ratio of the positive lens GR, bfw is a distance from the image side surface of the positive lens GR at a wide-angle end, fw is a focal length of the zoom lens at the wide-angle end, and f1 is a focal length of the first lens unit.
12 more elements
An imaging apparatus comprising:
- a zoom lens, and
- an image sensor configured to photoelectrically convert an optical image formed by the zoom lens,
- wherein the zoom lens comprises:
- a first lens unit having negative refractive power;
- a second lens unit having positive refractive power;
- an intermediate unit including one or more lens units;
- and
- a final lens unit having positive refractive power disposed closest to an image side,
- the first lens unit, the second lens unit, the intermediate unit, and the final lens unit being disposed in this order from an object side to the image side,
- intervals between adjacent lens units being changed during zooming,
- wherein the first lens unit includes a negative lens G1, a negative lens G2, and a negative lens G3 disposed in this order from the object side to the image side,
- wherein the final lens unit includes a negative lens and a positive lens GR disposed closest to the image side, and
- wherein the following inequalities are satisfied:
- 0.000<θgFGR−(−1.665*10−7*νdGR3+5.213*10−5*νdGR2−5.656*10−3*νdGR+0.7278)<0.100,
- 0.50<bfw/fw<1.50, and
- −1.00<fw/fl<−0.55,
- −0.90<bfw/f1<−0.40,
- where vdGR is an Abbe number of the positive lens GR, θgFGR is a partial dispersion ratio of the positive lens GR, bfw is a distance from the image side surface of the positive lens GR at a wide-angle end, fw is a focal length of the zoom lens at the wide-angle end, and f1 is a focal length of the first lens unit.
15 more elements
Dependencies are inferred from the claim text.