Title:
IMAGING OPTICAL SYSTEM, LENS UNIT, AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/097287
Kind Code:
A1
Abstract:
The present invention provides an imaging optical system having an angle of view of 180° or more and having sufficiently small changes in image formation performance and angle of view between different medium environments although being compact. An imaging optical system 10 substantially comprises a main lens ML, and a supplementary lens SL for use in an aqueous medium or for use in air, wherein an image formation position is located closer to the object side than an imaging surface I in the state of the main lens ML alone, the main lens ML comprises a plurality of lenses, the supplementary lens SL comprises one negative lens, and in a state where the main lens ML and the supplementary lens SL are combined, desired image formation performance is obtained, and the following conditional expression (1) is satisfied: -42≤fA/fM≤-17 where fA is the focal length of the supplementary lens SL, and fM is the focal length of the main lens ML.
Inventors:
YAMASHITA ATSUSHI (JP)
Application Number:
PCT/JP2017/042406
Publication Date:
May 31, 2018
Filing Date:
November 27, 2017
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B13/06; G02B13/04; G02B13/18; G02B15/06; G03B15/00; G03B17/08; G03B17/14
Domestic Patent References:
WO2010110350A1 | 2010-09-30 |
Foreign References:
JP2014102291A | 2014-06-05 | |||
US9477064B1 | 2016-10-25 | |||
JPS5485721A | 1979-07-07 | |||
JP2002116491A | 2002-04-19 |
Attorney, Agent or Firm:
FUKUDA, Mitsuhiro (JP)
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