Title:
OBJECTIVE OPTICAL SYSTEM, IMAGING DEVICE, AND ENDOSCOPE
Document Type and Number:
WIPO Patent Application WO/2022/054273
Kind Code:
A1
Abstract:
The present invention provides an objective optical system which allows sufficient brightness in a near-infrared optical image, high color reproducibility in a white optical image, and little deviation between the position of the near-infrared optical image and the position of the white optical image. This objective optical system has a predetermined lens disposed in the vicinity of a pupil of the objective optical system. The predetermined lens has a first refraction region including an optical axis, and a second refraction region located outside the first refraction region. The refractive power of the second refraction region is larger than the refractive power of the first refraction region. A light flux that arrives at an image surface includes a first light flux and a second light flux, the first light flux is transmitted through the first refraction region, and includes a light flux of white light and/or a light flux of near-infrared light, and the second light flux is transmitted through the second refraction region, and includes only the light flux of near-infrared light.
Inventors:
NAMII YASUSHI (JP)
Application Number:
PCT/JP2020/034695
Publication Date:
March 17, 2022
Filing Date:
September 14, 2020
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
A61B1/00; G02B13/04; G02B13/14; G02B13/18; G02B23/26
Foreign References:
| JP5315574B2 | 2013-10-16 | |||
| JP2006235139A | 2006-09-07 | |||
| JP2003098426A | 2003-04-03 | |||
| US20160092731A1 | 2016-03-31 | |||
| US20160313629A1 | 2016-10-27 |
Attorney, Agent or Firm:
SAITO Keisuke (JP)
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