Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JP2017156427
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a variable power optical system that is small and has good optical performance, an optical apparatus and a method for manufacturing a variable power optical system.SOLUTION: The variable power optical system includes, successively from an object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power, in which upon varying powers from a wide angle end state to a telephoto end state, intervals among the lens groups vary; and upon focusing, the fourth lens group G4 moves along the optical axis. A lens component G3L closest to the image side in the third lens group G3 is a cemented lens produced by cementing a negative lens and a positive lens.SELECTED DRAWING: Figure 1
Inventors:
UCHIDA KENSUKE
KOHAMA AKIHIKO
KOHAMA AKIHIKO
Application Number:
JP2016037591A
Publication Date:
September 07, 2017
Filing Date:
February 29, 2016
Export Citation:
Assignee:
NIPPON KOGAKU KK
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
| JP2011209347A | 2011-10-20 | |||
| JP2007286390A | 2007-11-01 | |||
| JP2011247962A | 2011-12-08 | |||
| JP2013210571A | 2013-10-10 | |||
| JP2013231760A | 2013-11-14 | |||
| JP2008304708A | 2008-12-18 | |||
| JP2009282429A | 2009-12-03 | |||
| JP2014106243A | 2014-06-09 |
Foreign References:
| WO2014017572A1 | 2014-01-30 |
Attorney, Agent or Firm:
Hoyo Joyo
Takashi Iwasaki
Takashi Iwasaki