Title:
Optical system and imaging device with it
Document Type and Number:
Japanese Patent JP6344965
Kind Code:
B2
Abstract:
Provided is an optical system, which retains enhanced optical performance at any object distance, and has compact and light-weight focus lens units. Provided is an optical system including a plurality of lens units, in which an interval between adjacent lens units changes during focusing, the optical system including: a positive lens unit arranged closest to an object side; first and second focus lens units having negative refractive powers configured to move during focusing; and an intermediate lens unit having a positive refractive power and arranged between the first and second focus lens units. The first and second focus lens units are configured to move toward an image side during focusing.
Inventors:
Mori Takeshi
Application Number:
JP2014096597A
Publication Date:
June 20, 2018
Filing Date:
May 08, 2014
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B13/00; G02B13/18
Domestic Patent References:
| JP2013152279A | ||||
| JP2012242742A | ||||
| JP2007260305A | ||||
| JP57046223A | ||||
| JP2005292345A |
Foreign References:
| US20130188091 | ||||
| US20070258150 | ||||
| US20140132830 |
Attorney, Agent or Firm:
Yukio Takanashi