Title:
ENDSCOPE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/173412
Kind Code:
A1
Abstract:
An objective of the present invention is to provide a compact endoscope system with which using a depolarization plate having a complex configuration is not required and it is possible to obtain an adequate depolarization effect. Provided is an endoscope system comprising, in order from the object side: an objective optical system OBL; an optical path segmenting unit 120 which segments light from the objective optical system in two; and an image capture element 122 which captures the two segmented images. A λ/4 wavelength plate 121a which is formed from one birefringent material is positioned in the optical path between the objective optical system OBL and the optical path segmenting unit 120. Said λ/4 wavelength plate 121a satisfies the following equations (1) and (2):
10 ≤ (d/d0) × 0.25 ≤ 85 (1) and
0.09 ≤ |Δn| ≤ 0.23 (2)
where d is the thickness of the λ/4 wavelength plate, d0 is the thickness of the λ/4 wavelength plate which reaches zero order in a line e, and Δn is the refraction in the line e of the λ/4 wavelength plate.
Inventors:
TSUYUKI HIROSHI (JP)
Application Number:
PCT/JP2017/047132
Publication Date:
September 27, 2018
Filing Date:
December 27, 2017
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
A61B1/00; G02B5/30; G02B13/04; G02B23/26; H04N5/225
Domestic Patent References:
| WO2016043107A1 | 2016-03-24 | |||
| WO2011058774A1 | 2011-05-19 |
Other References:
OJI SCIENTIFIC INSTRUMENTS, January 2014 (2014-01-01), pages 1 - 7, Retrieved from the Internet [retrieved on 20180312]
Attorney, Agent or Firm:
SAITO Keisuke et al. (JP)
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