Zoom lens and image pickup apparatus having the same

An apparatus comprising:

• a zoom lens;
• and
• a sensor configured to receive light of an image formed by the zoom lens,
• wherein the zoom lens includes a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, a middle group including one or more lens units, and a final lens unit having a negative refractive power, wherein each distance between adjacent lens units changes during zooming,
• wherein the first lens unit includes at least three negative lenses, and
• wherein following inequalities are satisfied:
• 0.6<TD12/(fl×fr)<10.0
• −10.0<(mr−mf)/fw<−0.1
• 1.0<(R2+R1)/(R2−R1)<10.0
• 0.05<TDr/fw<0.50
• where TD1 represents a thickness on an optical axis of the first lens unit, fl represents a focal length of the first lens unit, fr represents a focal length of the final lens unit, mr represents a moving amount of the final lens unit during zooming from a wide-angle end to a telephoto end, mf represents a moving amount of a lens unit next to the final lens unit on the object side during zooming from the wide-angle end to the telephoto end, fw represents a focal length of the zoom lens at the wide-angle end, R1 represents a curvature radius of an object-side lens surface of a lens closest to an image in the final lens unit, R2 represents a curvature radius of an image-side lens surface of the lens closest to the image in the final lens unit, and TDr represents a thickness on an optical axis of the final lens unit.

A system comprising:

• a zoom lens;
• and
• at least one processor configured to execute a plurality of tasks including a controlling task configured to control the zoom lens during zooming,
• of lens units consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, a middle group including one or more lens units, and a final lens unit having a negative refractive power, wherein each distance between adjacent lens units changes during zooming,
• wherein the first lens unit includes at least three negative lenses, and
• wherein following inequalities are satisfied:
• 0.6<TD12/(fl×fr)<10.0
• −10.0<(mr−mf)/fw<−0.1
• 1.0<(R2+R1)/(R2−R1)<10.0
• 0.05<TDr/fw<0.50
• where TD1 represents a thickness on an optical axis of the first lens unit, fl represents a focal length of the first lens unit, fr represents a focal length of the final lens unit, mr represents a moving amount of the final lens unit during zooming from a wide-angle end to a telephoto end, mf represents a moving amount of a lens unit next to the final lens unit on the object side during zooming from the wide-angle end to the telephoto end, fw represents a focal length of the zoom lens at the wide-angle end, R1 represents a curvature radius of an object-side lens surface of a lens closest to an image in the final lens unit, R2 represents a curvature radius of an image-side lens surface of the lens closest to the image in the final lens unit, and TDr represents a thickness on an optical axis of the final lens unit.

A zoom lens comprising a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, a middle group including one or more lens units, and a final lens unit having a negative refractive power, wherein each distance between adjacent lens units changes during zooming,

• wherein the first lens unit includes at least three negative lenses,
• wherein the final lens unit consists of a single lens having a negative refractive power. and
• wherein following inequalities are satisfied:
• 0.6<TD12/(fl×fr)<10.0
• −10.0<(mr−mf)/fw<−0.1
• 1.0<(R2+R1)/(R2−R1)<10.0
• where TD1 represents a thickness on an optical axis of the first lens unit, fl represents a focal length of the first lens unit, fr represents a focal length of the final lens unit, mr represents a moving amount of the final lens unit during zooming from a wide-angle end to a telephoto end, mf represents a moving amount of a lens unit next to the final lens unit on the object side during zooming from the wide-angle end to the telephoto end, fw represents a focal length of the zoom lens at the wide-angle end, R1 represents a curvature radius of an object-side lens surface of a lens closest to an image in the final lens unit, and R2 represents a curvature radius of an image-side lens surface of the lens closest to the image in the final lens unit.

A zoom lens comprising a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a positive refractive power, and a final lens unit having a negative refractive power, wherein each distance between adjacent lens units changes during zooming,

• wherein the first lens unit includes at least three negative lenses, and
• wherein following inequalities are satisfied:
• 0.6<TD12/(fl×fr)<10.0
• −10.0<(mr−mf)/fw<−0.1
• 1.0<(R2+R1)/(R2−R1)<10.0
• where TD1 represents a thickness on an optical axis of the first lens unit, fl represents a focal length of the first lens unit, fr represents a focal length of the final lens unit, mr represents a moving amount of the final lens unit during zooming from a wide-angle end to a telephoto end, mf represents a moving amount of the third lens unit next to the final lens unit on the object side during zooming from the wide-angle end to the telephoto end, fw represents a focal length of the zoom lens at the wide-angle end, R1 represents a curvature radius of an object-side lens surface of a lens closest to an image in the final lens unit, and R2 represents a curvature radius of an image-side lens surface of the lens closest to the image in the final lens unit.

A zoom lens comprising a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a final lens unit having a negative refractive power, wherein each distance between adjacent lens units changes during zooming,

• wherein the first lens unit includes at least three negative lenses, and
• wherein following inequalities are satisfied:
• 0.6<TD12/(fl×fr)<10.0
• −10.0<(mr−mf)/fw<−0.1
• 1.0<(R2+R1)/(R2−R1)<10.0
• where TD1 represents a thickness on an optical axis of the first lens unit, fl represents a focal length of the first lens unit, fr represents a focal length of the final lens unit, mr represents a moving amount of the final lens unit during zooming from a wide-angle end to a telephoto end, mf represents a moving amount of the second lens unit next to the final lens unit on the object side during zooming from the wide-angle end to the telephoto end, fw represents a focal length of the zoom lens at the wide-angle end, R1 represents a curvature radius of an object-side lens surface of a lens closest to an image in the final lens unit, and R2 represents a curvature radius of an image-side lens surface of the lens closest to the image in the final lens unit.

A zoom lens comprising a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a final lens unit having a negative refractive power, wherein each distance between adjacent lens units changes during zooming,

• wherein the first lens unit includes at least three negative lenses, and
• wherein following inequalities are satisfied:
• 0.6<TD12/(fl×fr)<10.0
• −10.0<(mr−mf)/fw<−0.1
• 1.0<(R2+R1)/(R2−R1)<10.0
• where TD1 represents a thickness on an optical axis of the first lens unit, fl represents a focal length of the first lens unit, fr represents a focal length of the final lens unit, mr represents a moving amount of the final lens unit during zooming from a wide-angle end to a telephoto end, mf represents a moving amount of the fourth lens unit next to the final lens unit on the object side during zooming from the wide-angle end to the telephoto end, fw represents a focal length of the zoom lens at the wide-angle end, R1 represents a curvature radius of an object-side lens surface of a lens closest to an image in the final lens unit, and R2 represents a curvature radius of an image-side lens surface of the lens closest to the image in the final lens unit.