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WO2018225613A1 - Système optique d'imagerie et endoscope - Google Patents

Système optique d'imagerie et endoscope Download PDF

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Publication number
WO2018225613A1
WO2018225613A1 PCT/JP2018/020919 JP2018020919W WO2018225613A1 WO 2018225613 A1 WO2018225613 A1 WO 2018225613A1 JP 2018020919 W JP2018020919 W JP 2018020919W WO 2018225613 A1 WO2018225613 A1 WO 2018225613A1
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WO
WIPO (PCT)
Prior art keywords
optical system
imaging optical
imaging
optical systems
obj
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/020919
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English (en)
Japanese (ja)
Inventor
菅武志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Corp
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 Corp filed Critical Olympus Corp
Priority to JP2018563650A priority Critical patent/JP6501995B1/ja
Publication of WO2018225613A1 publication Critical patent/WO2018225613A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • 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
    • G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/04—Roll-film cameras
    • G03B19/07—Roll-film cameras having more than one objective
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B35/00—Stereoscopic photography
    • G03B35/08—Stereoscopic photography by simultaneous recording

Definitions

  • the present invention relates to an imaging optical system and an endoscope.
  • a stereoscopic observation system uses a method in which two images with different parallax are imaged on an imaging surface of an imaging element on substantially the same plane for stereoscopic viewing. And in the structure of a prior art, in order to obtain two images from which parallax differs, it has two different optical systems (for example, refer patent document 1, 2).
  • flare may occur in the area between the two imaging optical systems. Such flare is undesirable because it degrades the quality of the observed image.
  • the present invention has been made in view of the above, and is an endoscope application for stereoscopic vision, and has an imaging optical system and a channel that achieve both high pixel count and flare reduction, and has reduced flare.
  • An object is to provide an endoscope.
  • the present invention has two imaging optical systems arranged in parallel, and the configuration of the flare stop of the two imaging optical systems is different. It is an imaging optical system.
  • two imaging optical systems are arranged in parallel, and the diameter of the lens closest to the image side of one of the two imaging optical systems is the other optical system.
  • the present invention according to still another aspect includes two imaging optical systems used for imaging for stereoscopic observation and a channel through which a treatment tool is inserted, and the optical axes of the two imaging optical systems. Is 2 mm or less, and the angle between the line segment connecting the center of the line segment connecting the centers of the most object side lenses of the two imaging optical systems and the center of the channel, and the line segment is ⁇ An endoscope characterized by being within 45 degrees.
  • the present invention is an endoscope application for stereoscopic vision, can provide an imaging optical system that achieves both high pixel count and flare reduction, and provides an endoscope having a channel and reduced flare. There is an effect that can be.
  • FIG. 1 shows the lens cross-sectional structure of the imaging optical system which concerns on 1st Embodiment. It is a figure which shows the lens cross-sectional structure of the imaging optical system which concerns on 2nd Embodiment.
  • (A) is a figure which shows the lens cross-sectional structure of the imaging optical system which concerns on 3rd Embodiment.
  • (B) is a figure which shows the front structure of the one part lens of the imaging optical system which concerns on 3rd Embodiment.
  • (A) is a figure which shows the front-end
  • (B) is a figure which shows the whole endoscope apparatus. It is a figure which shows the lens cross-sectional structure of the optical system for imaging which concerns on each embodiment. It is a figure which shows the flare which generate
  • FIG. 1 is a diagram illustrating a lens cross-sectional configuration of the imaging optical system 100 according to the first embodiment.
  • This embodiment has two imaging optical systems OBJ-R and OBJ-L arranged in parallel, and the configuration of the flare stop of the two imaging optical systems OBJ-R and OBJ-L is different.
  • the optical system OBJ-R is an imaging optical system for the right eye.
  • the optical system OBJ-L is an imaging optical system for the left eye.
  • the present embodiment and all of the second and third embodiments described below are imaging optical systems used for endoscope imaging for stereoscopic observation, and the lens L1 closest to the object side has two concave surface portions. This is one optical member having L11 and L12.
  • the optical system for stereoscopic observation is an optical system OBJ-R and an optical system OBJ-L that generate two optical images having parallax with each other.
  • the optical system OBJ-R forms an image for the right eye
  • the optical system OBJ-L forms an image for the left eye.
  • the distance between the two optical axes Ax1 and Ax2 is 2 mm or less.
  • the two imaging optical systems OBJ-R and OBJ-L have the same configuration of the flare stop FS.
  • the flare stop FS3 is disposed only on the image side of the lens L5 closest to the image side of one optical system OBJ-L.
  • FIG. 6 is a diagram showing flare generated in a conventional imaging optical system.
  • the optical system OBJ-R for the right eye and the optical system OBJ-L for the left eye light rays RAY-R and RAY-L indicated by solid lines from an object (not shown) are incident on the imaging surface I to form an image.
  • the light ray RAYf indicated by the broken line is reflected by the side surface of the lens L5 and causes flare.
  • the flare stop FS3 is disposed only on the image side of the lens L5 closest to the image side of one optical system OBJ-L. Therefore, flare generated by reflection on the side surface of the lens L5 can be reduced. Therefore, the quality of the observation image can be improved.
  • FIG. 2 is a diagram illustrating a lens cross-sectional configuration of the imaging optical system according to the second embodiment.
  • one optical system OBJ-R and the other optical system OBJ-L of the two optical systems OBJ-L and OBJ-R are the same in the optical system.
  • Flare stops FS1 and FS2 are provided at the respective positions.
  • the opening diameter (opening diameter) ⁇ 1 of the flare stop FS1 included in one optical system OBJ-L is preferably smaller than the opening diameter ⁇ 2 of the flare stop FS2 included in the other optical system OBJ-R.
  • Flare stop FS1 opening diameter ⁇ 1 0.5 (mm)
  • Flare stop FS2 opening diameter ⁇ 2 0.7 (mm)
  • the brightness of the image of the optical system having the smaller aperture diameter is reduced. For this reason, the brightness differs between the right eye image and the left eye image. Therefore, it is preferable to adjust the gain by electrically increasing the dark image. That is, if both the aperture diameters ⁇ 1 and ⁇ 2 are reduced, it is necessary to increase the electrical gain for both images, which causes a problem of increasing electrical noise. In this embodiment, this problem is avoided.
  • FIG. 3A is a diagram illustrating a lens cross-sectional configuration of the imaging optical system 300 according to the third embodiment.
  • the present embodiment includes two imaging optical systems OBJ-R and OBJ-L in parallel, and one of the two imaging optical systems OBJ-R and OBJ-L.
  • the diameter LL1 of the lens L5 closest to the image side is larger than the diameter LL2 of the lens L5 closest to the image side of the other optical system OBJ-L.
  • FIG. 3B is a diagram illustrating a front configuration of a part of lenses of the imaging optical system according to the third embodiment.
  • the most image-side lens L5 of the two imaging optical systems OBJ-R and OBJ-L has a circularly symmetric shape with respect to the optical axes Ax1 and Ax2.
  • the diameter of the lens L5 closest to the image side of the two imaging optical systems OBJ-R and OBJ-L is the distance LL from the optical axes Ax1 and Ax2 to the linear part D.
  • the diameter LL1 is made larger than the diameter LL2.
  • FIG. 4A is a diagram illustrating a distal end configuration viewed from the distal end side of an endoscope 400 according to the fourth embodiment.
  • the present embodiment includes two imaging optical systems OBJ-L and OBJ-R used for imaging for stereoscopic observation, a channel CH through which a treatment tool is inserted, and illumination optical systems IL1 and IL2.
  • FIG. 4B is a diagram illustrating a schematic configuration of the endoscope apparatus 10 having the imaging optical system according to the embodiment.
  • the endoscope apparatus 10 includes an endoscope 400 and an in vitro apparatus 7.
  • the endoscope 400 includes an insertion unit 3, an operation unit 2, a connection cord unit 5, and a connector unit 6.
  • the extracorporeal device 7 includes a power supply device, a video processor (not shown) that processes a video signal from the endoscope 400, and a display unit 8 that monitors and displays the video signal from the video processor.
  • the insertion portion 3 is an elongated and flexible member that can be inserted into a body cavity of a patient, and the distal end portion is a rigid distal rigid portion 1.
  • a user (not shown) can perform various operations using an angle knob or the like provided in the operation unit 2.
  • a connection cord portion 5 is extended from the operation portion 2. The connection cord portion 5 is connected to the in vitro device 7 via the connector 6.
  • the connection cord unit 5 communicates a power supply voltage signal from a power supply device or a video processor, a drive signal from an image sensor, and the like to an imaging system (not shown) built in the distal end rigid unit 1 and from the imaging system.
  • the video signal is communicated to the video processor.
  • the video processor in the in-vitro device 7 can be connected to peripheral devices (not shown) such as a video printer and a recording device.
  • the video processor can perform predetermined signal processing on the video signal from the imaging system and display an endoscopic image on the display screen (monitor) of the display unit 8.
  • the endoscope 400 according to the present embodiment is not limited to the configuration in which the insertion portion 3 has flexibility. For example, a rigid endoscope in which the insertion portion 3 is not bent may be used.
  • a bright spot is generated when the treatment tool is irradiated with illumination light from the illumination optical systems IL1 and IL2.
  • the treatment tool is made of a metal such as silver, and has a very high light reflectance as compared to the digestive tract tissue. For this reason, when a treatment tool such as a forceps is inserted and removed from the channel CH, the reflected light from the forceps becomes a strong luminescent spot. Therefore, a horizontal streaky flare occurs only in the left-eye imaging close to the forceps.
  • the imaging optical system OBJ-L close to the channel CH has a flare prevention unit. Preferably it is.
  • the flare prevention unit is a configuration for reducing flare described in the first embodiment, the second embodiment, and the third embodiment.
  • each of the above-described embodiments has an effect that the parallax is short, the pixel size is increased, and flare can be reduced. That is, when the parallax is shortened, it is necessary to reduce the diameter (LL1 and LL2 in FIG. 3) of the lens L5 closest to the image side. However, when the lens diameter is reduced, as shown in FIG. 6, light is reflected from the side surface of the lens L5 and flare occurs.
  • FIG. 5 is a diagram showing a lens cross-sectional configuration of the imaging optical system according to each of the embodiments.
  • the imaging optical system includes, in order from the object side, a plano-concave first lens L1 having a negative refractive power with a concave surface facing the image side and a meniscus-shaped first lens having a negative refractive power with a concave surface facing the object side.
  • the YAG laser cut coating is applied to the object side of the infrared absorption filter F1, and the LD laser cut coating is applied to the image side. Further, the cover glass F2 and the CCD cover glass CG are joined. d16 is an adhesive layer.
  • the numerical data of each of the above examples is shown below. Symbols r are the radii of curvature of the lens surfaces, d is the spacing between the lens surfaces, ne is the refractive index of the e-line of each lens, ⁇ d is the Abbe number of each lens, and Fno is the F number.
  • the diaphragm is a brightness diaphragm.
  • the above-described imaging optical system may satisfy a plurality of configurations at the same time. This is preferable for obtaining a good imaging optical system and endoscope. Moreover, the combination of a preferable structure is arbitrary.
  • various embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and may be implemented by appropriately combining the configurations of these embodiments without departing from the spirit of the present invention. The form is also within the scope of the present invention.
  • the optical system can be variously modified.
  • the optical system may be a zoom optical system having a movable part.
  • the lens L1 is formed by one optical member, but the two optical systems may be formed by separate members.
  • the lenses L1 to L3 may be a common lens in the two optical systems. In that case, the distance between the optical axes of the lens L4 and the lens L5 may be set to 2 mm or less.
  • the present invention is an endoscope application for stereoscopic vision, and is useful for an endoscope that has an imaging optical system and a channel that achieve both high pixel count and flare reduction, and has reduced flare. .
  • Imaging optical system 400 Endoscope L1-L5 Lens Ax1, Ax2 Optical axis S Brightness diaphragm F1 Filter F2 Cover glass CG CCD cover glass L11, L12 Concave surface FS, FS1, FS2, FS3 Flare diaphragm OBJ- R, OBJ-L Optical system for imaging IL1, IL2 Illumination optical system CH channel ⁇ 1, ⁇ 2 Aperture diameter LL1, LL2 Diameter

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

Abstract

La présente invention concerne un système optique d'imagerie qui est destiné à des applications d'endoscope pour la stéréopsie et permet d'obtenir à la fois des pixels accrus et une lumière parasite réduite, et un endoscope qui comporte des canaux et permet d'obtenir une lumière parasite réduite. Le système optique d'imagerie est caractérisé en ce qu'il comporte deux systèmes optiques parallèles OBJ-R, OBJ-L pour l'imagerie, et en ce que les constitutions d'ouverture de lumière parasite des deux systèmes optiques OBJ-R, OBJ-L pour l'imagerie sont différentes. En outre, la présente invention est caractérisée en ce qu'elle comprend les deux systèmes optiques OBJ-R, OBJ-L pour l'imagerie utilisés pour l'imagerie pour une visualisation stéréo et un canal CH à travers lequel passe un outil de traitement, et en ce que l'espacement entre les axes optiques Ax1, Ax2 pour les deux systèmes optiques pour l'imagerie est de 2 mm ou moins et l'angle formé par une droite reliant le centre d'un segment de droite reliant les centres des lentilles sur le côté objet des deux systèmes optiques pour l'imagerie et les centres des canaux et du segment de ligne est de ± 45°.
PCT/JP2018/020919 2017-06-07 2018-05-31 Système optique d'imagerie et endoscope Ceased WO2018225613A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018563650A JP6501995B1 (ja) 2017-06-07 2018-05-31 撮像光学系及び内視鏡

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JP2017112838 2017-06-07
JP2017-112838 2017-06-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3664683A1 (fr) * 2017-08-08 2020-06-17 Blazejewski Medi-Tech GmbH Vidéo-endoscope 3d

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005027738A1 (fr) * 2003-09-19 2005-03-31 Olympus Corporation Endoscope
JP2006288821A (ja) * 2005-04-12 2006-10-26 Olympus Medical Systems Corp 電子内視鏡
JP2014046075A (ja) * 2012-09-03 2014-03-17 Konica Minolta Inc 光学ユニットおよび内視鏡装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2017073292A1 (ja) * 2015-10-29 2018-01-11 オリンパス株式会社 内視鏡撮像ユニット

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005027738A1 (fr) * 2003-09-19 2005-03-31 Olympus Corporation Endoscope
JP2006288821A (ja) * 2005-04-12 2006-10-26 Olympus Medical Systems Corp 電子内視鏡
JP2014046075A (ja) * 2012-09-03 2014-03-17 Konica Minolta Inc 光学ユニットおよび内視鏡装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3664683A1 (fr) * 2017-08-08 2020-06-17 Blazejewski Medi-Tech GmbH Vidéo-endoscope 3d

Also Published As

Publication number Publication date
JP6501995B1 (ja) 2019-04-17
JPWO2018225613A1 (ja) 2019-06-27

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