Title:
OBJECTIVE OPTICAL SYSTEM AND IMAGING DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2019/207699
Kind Code:
A1
Abstract:
The present invention provides an objective optical system having small angle of view variation during focusing and for which various aberrations are satisfactorily corrected, and an imaging device using the objective optical system. The objective optical system comprises, in order from the object side, a first lens group G1 having negative refractive power, a second lens group G2, an aperture stop S, and a third lens group G3 having positive refractive power. During focusing, the second lens group G2 moves along the optical axis. The second lens group G2 comprises a positive lens and a negative lens.
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Inventors:
MIZUSAWA MASAYUKI (JP)
Application Number:
PCT/JP2018/016935
Publication Date:
October 31, 2019
Filing Date:
April 26, 2018
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
G02B13/04
Domestic Patent References:
| WO2014088104A1 | 2014-06-12 | |||
| WO2014129089A1 | 2014-08-28 | |||
| WO2013027459A1 | 2013-02-28 |
Foreign References:
| JP2008233284A | 2008-10-02 | |||
| JP2011107267A | 2011-06-02 | |||
| JP2014056133A | 2014-03-27 | |||
| JP2000131606A | 2000-05-12 | |||
| JP2011242520A | 2011-12-01 | |||
| JP2007094174A | 2007-04-12 | |||
| JPH08304704A | 1996-11-22 |
Attorney, Agent or Firm:
SAITO Keisuke (JP)
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