Zoom lens and image pickup apparatus including the same

Patent metadata

Field	Value
Publication number	US-8928798-B2
Application number	US-201313958664-A
Country	US
Kind code	B2
Filing date	Aug 5, 2013
Priority date	Aug 17, 2012
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A zoom lens, including, in order from object side to image side: a positive first lens unit which does not move during zooming; a negative second lens unit for zooming; a positive third lens unit for zooming; a negative fourth lens unit which moves during zooming; and a positive fifth lens unit which does not move during zooming, in which: 0.6<|β3F|<1.0, −4.0<f4/f3<−1.0, and 20<L2w/L3w<300 are satisfied, where β3F is a lateral magnification of the third lens unit at a position at which a lateral magnification of the second lens unit becomes −1; f3 and f4 are respectively focal lengths of the third and fourth lens units; L2w is a gap between the second and third lens units at a wide angle end; and L3w is a gap between the third and fourth lens units at the wide angle end.

First claim

What is claimed is:

1. A zoom lens, comprising, in order from an object side to an image side:
a first lens unit having a positive refractive power which does not move for zooming;
a second lens unit having a negative refractive power which moves during zooming;
a third lens unit having the positive refractive power which moves during zooming;
a fourth lens unit having the negative refractive power which moves during zooming; and
a fifth lens unit having the positive refra…

Assignees

• Canon Kk

Inventors

• Eguchi Yosuke
• Hori Masao

Classifications

• G02B15/173

  Physics · mapped topic

• G02B15/14 Primary

  Physics · mapped topic

• G02B15/145121 Primary

  Physics · mapped topic

• G02B15/144113

  Physics · mapped topic