WO2017012854A1 - Agencement de prismes pour un endoscope avec direction de visée latérale ainsi qu'endoscope - Google Patents

Agencement de prismes pour un endoscope avec direction de visée latérale ainsi qu'endoscope Download PDF

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Publication number
WO2017012854A1
WO2017012854A1 PCT/EP2016/065770 EP2016065770W WO2017012854A1 WO 2017012854 A1 WO2017012854 A1 WO 2017012854A1 EP 2016065770 W EP2016065770 W EP 2016065770W WO 2017012854 A1 WO2017012854 A1 WO 2017012854A1
Authority
WO
WIPO (PCT)
Prior art keywords
prism
interface
lens
endoscope
arrangement
Prior art date
Application number
PCT/EP2016/065770
Other languages
German (de)
English (en)
Inventor
Mario Bock
Original Assignee
Olympus Winter & Ibe Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Winter & Ibe Gmbh filed Critical Olympus Winter & Ibe Gmbh
Publication of WO2017012854A1 publication Critical patent/WO2017012854A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2423—Optical details of the distal end
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00096—Optical elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00174—Optical arrangements characterised by the viewing angles
    • A61B1/00179—Optical arrangements characterised by the viewing angles for off-axis viewing

Definitions

  • the invention relates to a prism assembly for a side-view endoscope having two prisms and a plane input face lens defining an optical path for light rays entering a first prism of the prism array from a first interface of a first prism through a first common interface between the first prism and a second prism into the second prism and further through a second common interface between the second prism and the lens into the lens of the prism array and on the way from the first interface of the first prism to the lens at two reflective interfaces is mirrored.
  • the invention further relates to an endoscope with a lateral viewing direction and a prism arrangement arranged distally behind an entrance window and / or an entrance lens.
  • the usually two or three prisms of the prism arrangement are cemented together at common interfaces by means of optical cement.
  • the reflections take place on two reflecting boundary surfaces of the second prism of the prism arrangement which are inclined both at the optical axis of the entrance aperture and at the longitudinal axis of the endoscope.
  • the inclined reflecting interface of the second prism, at which the second reflection takes place partially forms a common interface with the first prism with which it is cemented. Through this cemented part of the beam path first passes through to get from the first into the second prism.
  • the input optical assembly typically further includes an entrance lens that focuses incoming light into the beam path that passes through the prism array.
  • This entrance lens also determines the optical axis of the optical assembly.
  • the combination of entrance lens and prism arrangement therefore also determines the opening angle of the field of view (FOV) of the endoscope, whereby further lens groups may have a further aperture effect or separate apertures for the selection of the field of view may be present.
  • FOV field of view
  • a disadvantage of this known construction is that light rays which enter from outside the predetermined field of view of the endoscope, at the first reflecting interface of the second prism can be reflected back and then reflected back to the first reflecting interface by Fresnel reflection or total reflection at the first common interface, which represents the extension of the second reflecting interface of the second prism. From here, such rays are in turn reflected back to the second reflecting interface and from there into a lens with a flat input surface. This quadruple reflection thus produces unwanted ghosting or "flares" in the image.
  • the present invention is based on the object to avoid unwanted flare in the beam path sideways looking endoscopes with a fixed sideways viewing angle.
  • a prism assembly for a side-view endoscope having two prisms and a plane input face lens defining an optical path for light rays entering a first prism of the prism array from a first interface of a first prism through a first common prism Interface between the first prism and a second prism in the second prism and further through a second common interface between the second prism and the lens in the lens of the prism array extends and on the way from the first interface of the first prism to the lens at two reflective
  • An interface is mirrored, which is further developed in that the first common interface within a tolerance range is perpendicular or parallel to an optical axis coinciding with a central beam path for light entering the first prism.
  • the inventive arrangement of the first common interface within a tolerance range perpendicular or parallel to an optical axis which coincides with a central ray path for light entering the first prism has the effect of avoiding Fresnel reflection or total reflection with further ray trajectory to the observer in this region, even for light entering from very far sideways
  • the determination of the tolerance range in which this effect is achieved is part of the scope of the optician who is responsible for planning the corresponding prism arrangements I could be of an endoscope.
  • the tolerance range is up to ⁇ 5 ° and / or is calculated so that light rays entering from outside a predetermined maximum angular range of a predetermined field of view, no Fresnel reflection or total reflection, especially with further beam path to the viewer, in the first common Experience interface. This applies to the light rays from the predetermined field of view anyway.
  • the first common interface is oriented perpendicular to the optical axis, the first of the two reflections of the beam path will occur in the second prism, while this already occurs in the first prism when the first common interface is parallel to the optical axis.
  • the optical axis coincides with the central ray path of the incoming light and becomes fixed at the optical design of the optical assembly.
  • a rotationally symmetrical entrance lens is mounted on the first interface of the first prism whose central axis of symmetry determines the optical axis and the central optical path of the optical path of the prism array.
  • the prism assembly is calculated to provide a distal optical assembly of the endoscope with the entrance lens.
  • the individual components are calculated in such a way that an optimal beam guidance with high optical quality and without loss of image angle is achieved.
  • an overlap region between the first prism and the second prism in the first common interface is dimensioned so that the optical path for a predetermined field of view angle of the endoscope completely passes through the overlap region, while rays from outside the predetermined field of view angle, except for a tolerance range to miss the overlap area. In this way it is possible to achieve a dazzling effect.
  • This is advantageously enhanced or replaced by having the overlap region and / or the entire first common interface unreflected, and / or the first common interface outside the overlap region is at least partially opaque to light rays or light absorbing.
  • the surface which forms the first common boundary surface on the side of the first prism is larger than the surface which forms the first common boundary surface on the side of the second prism.
  • This endoscope has the same features, advantages and properties as the prism arrangement contained in it.
  • Fig. 1 is a schematic representation of a known
  • Fig. 2 shows a schematic arrangement of a beam path through a further known prism arrangement
  • Fig. 3 is a schematic representation of the generation of "flares" in a known prism arrangement
  • Fig. 4a), 4b) show two variants of inventive prismatic Orders in a schematic representation.
  • a known prior art prism assembly 70 is illustrated schematically in cross-section by Applicants.
  • the prism assembly 70 comprises a first prism 10, a second prism 20, and a planar input surface lens 30, the first prism 10 having the second prism 20 and the second prism 20 having the lens 30 each having an optical cement or optical cement 40 is connected flat.
  • a central beam path 2 which enters perpendicularly through a first interface 1 1 of the first prism 1 0 and without deflection to a reflective interface 22 of the second prism 20, from where within the second prism 20 to another reflective interface 21 runs and from there in a central axis of the lens 30 is reflected parallel to a longitudinal axis of an endoscope, not shown.
  • the designated by the reference numeral 21 interface is at the same time a common interface with the first prism 10.
  • Fig. 2 shows schematically in cross section the course of a complete beam path with a central beam path 2 and peripheral beams through a very similar known prism arrangement 71, wherein the light enters through an entrance window 6 and an entrance lens 8 and through a first interface 11 into a first prism 1 0 of the prism assembly 71 occurs.
  • rale beam path 2 arranged. The beam path penetrates this interface 1 2 and is reflected twice at the reflective interfaces 21 and 22 of the second prism 20.
  • a part of the interface 22 is formed reflective, while another part, which is designated by the reference numeral 12, is continuous for the light.
  • the light of the beam path then enters the lens 30 through a common interface 31 with the second prism 20.
  • FIG. 3 shows, for a very similar known prism arrangement 72, how a large angle entering peripheral light beam 4 passes through the entrance lens 8 into the first prism 10 through the non-mirrored area of the common interface 12 into the second prism 20 and the reflective one Boundary surface 21 of the second prism 20 is reflected back at an acute angle.
  • This light beam 4 undergoes a Fresnel reflection or total reflection in this actually continuous region of the common boundary surface 12 and is mirrored back to the reflective interface 21, from which it enters the reflective region of the common interface 1 2 or the interface 22 of the second prism 20, there to be reflected in the third prism 30 there.
  • This quadruple reflected peripheral light beam 4 generates an undesirable ghosting or "flare" in the viewer.
  • Figs. 4a) and 4b two examples of prism arrangements 60, 61 according to the invention are shown, each with an entry lens 8 set in front of it and a few rays of the beam path, including a central beam path 2.
  • the beam path passes through the first prism 10 without reflection and impinges on a common boundary surface 12, which is substantially perpendicular to the optical axis and the central beam path 2 stands.
  • the double reflection takes place at the reflective interfaces 21 and 22 of the second prism 20 before the beam path enters the lens 30.
  • the geometry of the common boundary surface 12 is chosen such that a reflection back to the boundary surface does not lead to a Fresnel reflection or total reflection with a further beam path as far as the viewer in the common boundary surface 12 and thus to a further one even under large entrance angles Mirroring can lead.
  • FIG. 4b prevents this fourfold reflection by the fact that the common boundary surface 12 is arranged parallel to the central beam path 2 or to the obliquely bl ickenden optical axis input of the system.
  • the first reflection takes place at the reflective interface 1 3 of the first prism 1 0 and the second reflection at the reflective interface 21 of the second prism 20.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Optics & Photonics (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biophysics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)
  • Endoscopes (AREA)

Abstract

L'invention concerne un agencement de prismes (60, 61) pour un endoscope avec direction de visée latérale comportant deux prismes (10, 20) et une lentille (30) ayant une surface d'entrée plane, qui définissent un chemin optique pour des rayons lumineux pénétrant dans un premier prisme (10) de l'agencement de prismes (60, 61), lequel chemin optique partant d'une première surface frontière (11) du premier prisme (10) traverse une première surface frontière commune entre le premier prisme (10) et un second prisme (20) avant de pénétrer dans le second prisme (20) et traverse une seconde surface frontière commune (31) entre le second prisme (20) et la lentille (30) avant de pénétrer dans la lentille (30) de l'agencement de prismes (60, 61), et, sur le trajet de la première surface frontière (11) du premier prisme (10) vers la lentille (30), est réfléchi sur deux surfaces frontières réfléchissantes (13, 21, 22). La présente invention concerne en outre un endoscope avec une direction de visée latérale et avec un agencement de prismes (60, 61) disposé d'une manière distale derrière une fenêtre d'incidence (6) et/ou une lentille d'incidence (8). Selon l'invention, la première surface frontière (12) est située, à l'intérieur d'une plage de tolérance, perpendiculaire ou parallèle à un axe optique qui coïncide avec une trajectoire de rayonnement centrale (2) pour la lumière incidente sur le premier prisme (10).
PCT/EP2016/065770 2015-07-22 2016-07-05 Agencement de prismes pour un endoscope avec direction de visée latérale ainsi qu'endoscope WO2017012854A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015213773.2 2015-07-22
DE102015213773.2A DE102015213773A1 (de) 2015-07-22 2015-07-22 Prismenanordnung für ein Endoskop mit seitlicher Blickrichtung sowie Endoskop

Publications (1)

Publication Number Publication Date
WO2017012854A1 true WO2017012854A1 (fr) 2017-01-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/065770 WO2017012854A1 (fr) 2015-07-22 2016-07-05 Agencement de prismes pour un endoscope avec direction de visée latérale ainsi qu'endoscope

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DE (1) DE102015213773A1 (fr)
WO (1) WO2017012854A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4684224A (en) * 1982-11-10 1987-08-04 Olympus Optical Co., Ltd. Field view direction changing optical system
US4846154A (en) * 1988-06-13 1989-07-11 Macanally Richard B Dual view endoscope
JPH0511196A (ja) * 1991-07-08 1993-01-19 Olympus Optical Co Ltd 内視鏡用視野方向変換光学系
US5689365A (en) * 1994-09-13 1997-11-18 Olympus Optical Co., Ltd Stereoscopic-vision endoscope
US20020091305A1 (en) * 1999-06-25 2002-07-11 Frank Lederer Endoscope with a deflection system
US7280283B1 (en) * 2006-05-17 2007-10-09 Olympus Corporation Endoscopic objective optical system, and imaging system using the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640186C3 (de) * 1986-11-25 1994-08-11 Wolf Gmbh Richard Verfahren zur Herstellung eines Objektivs für Endoskope
DE4217889A1 (de) * 1992-05-29 1993-12-02 Wolf Gmbh Richard Endoskopoptik
DE102010027079A1 (de) * 2010-07-13 2012-01-19 Olympus Winter & Ibe Gmbh Objektiv eines schräg blickenden, starren Endoskopes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4684224A (en) * 1982-11-10 1987-08-04 Olympus Optical Co., Ltd. Field view direction changing optical system
US4846154A (en) * 1988-06-13 1989-07-11 Macanally Richard B Dual view endoscope
JPH0511196A (ja) * 1991-07-08 1993-01-19 Olympus Optical Co Ltd 内視鏡用視野方向変換光学系
US5689365A (en) * 1994-09-13 1997-11-18 Olympus Optical Co., Ltd Stereoscopic-vision endoscope
US20020091305A1 (en) * 1999-06-25 2002-07-11 Frank Lederer Endoscope with a deflection system
US7280283B1 (en) * 2006-05-17 2007-10-09 Olympus Corporation Endoscopic objective optical system, and imaging system using the same

Also Published As

Publication number Publication date
DE102015213773A1 (de) 2017-01-26

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