公开(公告)号：US20190076001A1

公开(公告)日：2019-03-14

申请号：US16185064

申请日：2018-11-09

Applicant: OLYMPUS CORPORATION

Inventor： Hiroshi TSUYUKI

IPC: A61B1/00 ,  A61B1/04 ,  A61B1/06 ,  G02B27/12

Abstract: An objective optical system includes a lens group and an optical path splitting element. The optical path splitting element is disposed on an optical path of the lens group, the optical path splitting element includes an optical path splitting surface configured to form a first optical path and a second optical path, an optical path length in the first optical path is different from an optical path length in the second optical path, a sum total of the number of transmissions of light and the number of reflections of light in the second optical path is larger than a sum total of the number of transmissions of light and the number of reflections of light in the first optical path, and an optical surface satisfying following conditional expression (1) is disposed on the first optical path, 0.8≤MR650/MR550≤0.9  (1).

公开(公告)号：US20210038060A1

公开(公告)日：2021-02-11

申请号：US17009840

申请日：2020-09-02

Applicant: OLYMPUS CORPORATION

Inventor： Hiroshi TSUYUKI

IPC: A61B1/00 ,  A61B1/05

Abstract: An optical system includes in order from an object side, an objective optical system, a λ/4 wavelength plate including one birefringent material, a polarizing beam splitter which splits light from the objective optical system into two, and an image sensor which picks up two images split. The polarizing beam splitter causes to occur an axial astigmatism of an opposite sign with respect to an axial astigmatism occurred due to the λ/4 wavelength plate, the following conditional expression (1) is satisfied. 1.1≤Fno/(d/|Δn|)≤49  (1) where, Fno denotes an effective F-number of the objective optical system, d denotes a thickness of the λ/4 wavelength plate, and Δn denotes a birefringence of the λ/4 wavelength plate for an e-line, provided that, |0.01|

公开(公告)号：US20200018947A1

公开(公告)日：2020-01-16

申请号：US16579601

申请日：2019-09-23

Applicant: OLYMPUS CORPORATION

Inventor： Hiroshi TSUYUKI

IPC: G02B23/24 ,  G02B21/18 ,  H04N5/225

Abstract: An endoscope includes in order from an object side to an image side, an objective optical system, an optical-path splitter which splits light from the objective optical system into two, and an image sensor which picks up two split images.A multi-order λ/4 wavelength plate made of a birefringent material is disposed in an optical path between the objective optical system and the optical-path splitter, and the multi-order λ/4 wavelength plate satisfies the following conditional expressions (1) and (2)′. 10≤(d/d0)×0.25≤85  (1) 0.08

公开(公告)号：US20200015656A1

公开(公告)日：2020-01-16

申请号：US16583124

申请日：2019-09-25

Applicant: OLYMPUS CORPORATION

Inventor： Hiroshi TSUYUKI

IPC: A61B1/00 ,  G02B23/04 ,  G02B23/26

Abstract: An endoscope includes in order from an object side, an objective optical system, an optical-path splitter, an image sensor, and an image processor. A λ/4 wavelength plate is disposed between the objective optical system and the optical-path splitter. The optical-path splitter includes in order from the object side, a first prism and a second prism, and has a beam splitting surface at which the first prism and the second prism are brought into close contact. The optical-path splitter splits light at the beam splitting surface, into a first optical path through which P-polarized light is transmitted and a second optical path through which S-polarized light is reflected. The first prism and the second prism, by sliding the beam splitting surface, adjust an optical path length of the first optical path and an optical path length of the second optical path, and are disposed at positions of cancelling an amount of shift in a focusing position of extraordinary light and a focusing position of ordinary light, and satisfy specific conditional expressions.

公开(公告)号：US20170187943A1

公开(公告)日：2017-06-29

申请号：US15457654

申请日：2017-03-13

Applicant: OLYMPUS CORPORATION

Inventor： Hiroshi TSUYUKI ,  Mitsujiro KONNO ,  Akikazu YACHI

IPC: H04N5/235 ,  A61B1/06 ,  A61B1/00 ,  H04N5/225 ,  G02B27/00 ,  G02B23/24 ,  G02B23/04 ,  G02B27/28 ,  G02B5/30 ,  A61B1/04 ,  H04N5/265

CPC classification number: H04N5/2354 ,  A61B1/00009 ,  A61B1/00045 ,  A61B1/00188 ,  A61B1/04 ,  A61B1/06 ,  G02B5/3083 ,  G02B23/04 ,  G02B23/2423 ,  G02B23/2453 ,  G02B23/2461 ,  G02B23/2469 ,  G02B23/2484 ,  G02B27/0075 ,  G02B27/283 ,  G02B27/286 ,  H04N5/2256 ,  H04N5/232 ,  H04N5/2351 ,  H04N5/243 ,  H04N5/265 ,  H04N9/045 ,  H04N2005/2255

Abstract: An endoscope system includes: a generating means generating a compositing mask that serves as compositing ratios of the corresponding pixels between a pair of images acquired by simultaneously imaging two optical images having different focus positions, into which a subject image is divided on the basis of the ratios of contrasts; a correcting means subjecting compositing masks generated for pairs of images acquired in time series, to weighted averaging for respective pixels, thus generating a corrected mask; and an compositing means compositing the two images according to the corrected mask. The correcting means subjects the compositing masks to weighted averaging by performing weighting such that the percentage of the past compositing masks is higher at pixels constituting a static area and an area having contrast lower than a threshold than at pixels constituting a moving-object area or an area having contrast equal to or higher than the threshold.