Title:
ズームレンズ、光学機器、および、撮像装置
Document Type and Number:
Japanese Patent JP7183065
Kind Code:
B2
Abstract:
A zoom lens includes a plurality of lens units, in which a distance between adjacent lens units changes during zooming, a first aperture stop, and a second aperture stop disposed on an image side of the first aperture stop. An aperture diameter of the first aperture stop determines an F-number of the zoom lens at a wide-angle end. The plurality of lens units includes a negative lens unit having a negative refractive power that is disposed on the image side of the first aperture stop and on an object side of the second aperture. An aperture diameter of the second aperture stop changes during the zooming. The aperture diameter of the second aperture stop at the wide-angle end is larger than the aperture diameter of the second aperture stop at a telephoto end.
Inventors:
Yuichi Gyoda
Application Number:
JP2019021356A
Publication Date:
December 05, 2022
Filing Date:
February 08, 2019
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B15/20; G03B9/06
Domestic Patent References:
| JP2015191065A | ||||
| JP10197794A | ||||
| JP63070218A | ||||
| JP2018013685A | ||||
| JP2016014800A |
Foreign References:
| US20090323205 |
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsuya Mizumoto
Tomoya Hirayama
Atsuya Mizumoto
Tomoya Hirayama