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Patent Searching and Data


Title:
OBJECTIVE OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/203465
Kind Code:
A1
Abstract:
Provided is an objective optical system that is not readily affected by various errors and that is bright, and whereby various aberrations are satisfactorily corrected. An objective optical system has, in order from the object side thereof, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power, the second lens group G2 moving toward the object side and the third lens group G3 moving toward the image side during focusing from a distant object point to a close object point, and conditional expression (1) being satisfied. (1) 2 < fG2/f < 8. In the expression, fG2 is the focal length of the second lens group, and f is the focal length of the objective optical system overall when focused at the distant object point.

Inventors:
TAKATO Hideyasu (2951 Ishikawa-machi, Hachioji-sh, Tokyo 07, 〒1928507, JP)
Application Number:
JP2018/015169
Publication Date:
November 08, 2018
Filing Date:
April 11, 2018
Export Citation:
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Assignee:
OLYMPUS CORPORATION (2951, Ishikawa-machi Hachioji-sh, Tokyo 07, 〒1928507, JP)
International Classes:
G02B13/04
Domestic Patent References:
WO2013069266A12013-05-16
WO2013069263A12013-05-16
Foreign References:
JP2013104956A2013-05-30
JP2001091832A2001-04-06
JP2015022161A2015-02-02
Attorney, Agent or Firm:
SAITO Keisuke (Surugadai-shita MK Bldg. 6F, 41-3 Kanda-jimbocho 1-chome, Chiyoda-k, Tokyo 51, 〒1010051, JP)
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