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US 7,187,504 B2Granted
Zoom lens and image pick up apparatus including the same
AssigneeCanon Kabushiki Kaisha
InventorAkihisa Horiuchi
Life of this patent
Estimating the term…
Abstract
A zoom lens includes, in order from an object side to an image side: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power and an aperture stop; a fourth lens unit having negative optical power; and a fifth lens unit having positive optical power, in which, during zooming from a wide-angle end to a telephoto end, the first lens unit stays, the second lens unit moves toward the image side, and the third lens unit moves together with the aperture stop.
Claims26
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power, wherein the first lens unit does not move for zooming, and during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop, wherein:
- the fourth lens unit moves during the zooming;
- and
- the fourth lens unit moves during focusing.
9 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power, wherein the first lens unit does not move for zooming, and during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop, wherein at least one of three conditions
- 0.2<|f2/fA|<0.4
- 2.10<e4T/fw<4.35
- 0.7<|f3/f4|<1.3
- is satisfied, where
- fA=√{square root over (fw·ft)}
- fw and ft represent a focal length of an entire system at the wide-angle end and a focal length thereof at the telephoto end, respectively, f2 represents a focal length of the second lens unit, f3 represents a focal length of the third lens unit, f4 represents a focal length of the fourth lens unit, and e4T represents a principal point interval between the fourth lens unit and the fifth lens unit in a case where focusing is performed on an infinitely distant object at the telephoto end.
12 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power,
- wherein the first lens unit does not move for zooming, and
- during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop,
- wherein the following condition is satisfied,
- 1.5<M2/M3<5.4,
- where M2 represents a movement amount of the second lens unit in a case where zooming is performed from the wide-angle end to the telephoto end and M3 represents a distance on an optical axis between a position of the third lens unit in a case where the third lens unit is located at the most object side and a position thereof in the case where the third lens unit is located at the most image side.
11 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power,
- wherein the first lens unit does not move for zooming, and
- during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop,
- wherein the second lens unit comprises an aspherical shape having an optical power that becomes weaker as a position in the second lens unit becomes farther from a lens center and closer to a lens circumference.
9 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power,
- wherein the first lens unit does not move for zooming, and
- during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop,
- wherein the following condition is satisfied,
- 1.76<Nn<2.01,
- where Nn represents an average refractive index of lens materials of the second lens unit.
11 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power,
- wherein the first lens unit does not move for zooming, and
- during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop,
- wherein the following condition is satisfied,
- 0.46<|R22/R23|<0.79,
- where R2i represents a curvature radius of an i-th lens surface of the second lens unit counted from the object side.
11 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power,
- wherein the first lens unit does not move for zooming, and
- during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop,
- wherein the first lens unit includes at least one negative lens and a plurality of positive lenses, an average Abbe number of materials of the positive lenses is equal to or larger than 68, and an Abbe number of a material of at least one positive lens is equal to or larger than 70.
9 more elements
A zoom lens, comprising, in order from an object side to an image side:
- a first lens unit having positive optical power;
- a second lens unit having negative optical power;
- a third lens unit having positive optical power, the third lens unit including an aperture stop;
- a fourth lens unit having negative optical power;
- and
- a fifth lens unit having positive refractive power,
- wherein the first lens unit does not move for zooming, and
- during zooming from a wide-angle end to a telephoto end:
- the second lens unit moves toward the image side;
- and
- the third lens unit moves together with the aperture stop,
- wherein at least part of the third lens unit are shifted in a direction perpendicular to an optical axis or rotated about an axis orthogonal to the optical axis.
9 more elements
Dependencies are inferred from the claim text.