Zoom lens and image pickup apparatus

Patent metadata

Field	Value
Publication number	US-9030752-B2
Application number	US-201313928601-A
Country	US
Kind code	B2
Filing date	Jun 27, 2013
Priority date	Jun 29, 2012
Publication date	May 12, 2015
Grant date	May 12, 2015

Abstract

The zoom lens includes at least five lens groups including first, second, third, fourth and fifth lens groups respectively having positive, negative, negative, positive and positive refractive powers. At least four movable lens groups are moved during zooming. At least two movable lens groups placed further on an image side than an aperture. C1 and C2 lens groups are moved so as to draw mutually different loci and such that a distance therebetween becomes maximum at a middle zoom position. The C1 and C2 lens groups are located further on a same side at the telephoto end than at a wide-angle end. At least one of D1 and D2 lens groups is moved during the zooming so as to be located further on an object side at a telephoto end than at the wide-angle end. A distance therebetween at the telephoto end becomes larger than that at wide-angle end.

First claim

What is claimed is:

1. A zoom lens comprising at least five lens groups including in order from an object side to an image side:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having a negative refractive power;
a fourth lens group having a positive refractive power; and
a fifth lens group having a positive refractive power,
wherein, of the at least five lens groups, at least four lens gro…

Assignees

• Canon Kk

Inventors

• Eguchi Kaoru

Classifications

• G02B15/14 Primary

  Physics · mapped topic

• G02B15/17

  Physics · mapped topic

• G02B27/646

  Physics · mapped topic

• G02B15/145125 Primary

  Physics · mapped topic

• G02B15/1461

  Physics · mapped topic