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US 7,480,102 B2Granted
Zoom lens and optical apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorTakayoshi Yokoyama
Life of this patent
Estimating the term…
Abstract
At least one exemplary embodiment is directed to a zoom lens including a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming, an aperture stop, and a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0. The refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition: dt/dw>1.1.
Claims21
A zoom lens comprising:
- a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
- an aperture stop;
- and
- a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
- θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,
- wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
- dt/dw>1.1,
- wherein the refractive optical element has a negative refractive power and is located behind the aperture stop.
5 more elements
A zoom lens comprising:
- a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
- an aperture stop;
- and
- a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
- θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,
- wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
- dw/dt>1.1,
- wherein the refractive optical element has a negative refractive power and is located in front of the aperture stop.
5 more elements
A zoom lens comprising:
- a lens unit having a negative refractive power;
- a lens unit having a positive refractive power located behind the lens unit having a negative refractive power, in which zooming is performed by moving at least one of the two lens units along an optical axis;
- an aperture stop;
- and
- a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
- θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.700)<0,
- wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on the optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
- dt/dw>1.1,
- wherein the refractive optical element has a negative refractive power and is located in front of the aperture stop.
6 more elements
A zoom lens comprising:
- a lens unit having a negative refractive power;
- a lens unit having a positive refractive power located behind the lens unit having a negative refractive power, in which zooming is performed by moving at least one of the two lens units along an optical axis;
- an aperture stop;
- and
- a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
- θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.700)<0,
- wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on the optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
- dw/dt>1.1,
- wherein the refractive optical element has a negative refractive power and is located behind the aperture stop.
6 more elements
A zoom lens comprising:
- a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
- an aperture stop;
- and
- a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
- θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,
- wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
- dt/dw>1.1,
- wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition:
- θgd−(−1.687×10−7·νd3+5.702×10−5·νd2−6.603×10−3·νd+1.500)>0.
6 more elements
A zoom lens comprising:
- a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
- an aperture stop;
- and
- a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
- θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,
- wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
- dw/dt>1.1,
- wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition:
- θgd−(−1.687×10−7·νd3+5.702×10−5·νd2−6.603×10−3·νd+1.500)>0.
6 more elements
Dependencies are inferred from the claim text.