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WO2012017861A1 - Endoscope - Google Patents

Endoscope Download PDF

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Publication number
WO2012017861A1
WO2012017861A1 PCT/JP2011/066953 JP2011066953W WO2012017861A1 WO 2012017861 A1 WO2012017861 A1 WO 2012017861A1 JP 2011066953 W JP2011066953 W JP 2011066953W WO 2012017861 A1 WO2012017861 A1 WO 2012017861A1
Authority
WO
WIPO (PCT)
Prior art keywords
distal end
cover member
tip
lens frame
gap
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/JP2011/066953
Other languages
English (en)
Japanese (ja)
Inventor
聡志 牧山
小板橋　正信
卓郎 堤
雄治 進藤
慎一 齋藤
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 Medical Systems Corp
Original Assignee
Olympus Medical Systems 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 Medical Systems Corp filed Critical Olympus Medical Systems Corp
Publication of WO2012017861A1 publication Critical patent/WO2012017861A1/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
    • 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
    • A61B1/00091—Nozzles
    • 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
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/0011—Manufacturing of endoscope parts
    • 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
    • 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
    • G02B23/2476—Non-optical details, e.g. housings, mountings, supports

Definitions

  • the present invention relates to an endoscope in which a distal end portion main body constituting a distal end portion of an insertion portion is covered with a cover member.
  • endoscopes inserted into a subject have been widely used in the medical field and industrial field.
  • the endoscope can observe the inside of the subject by inserting an elongated insertion portion into the subject.
  • an imaging unit for imaging the inside of the subject is provided in the distal end portion provided on the distal end side in the insertion direction of the insertion portion of the endoscope (hereinafter simply referred to as the distal end side).
  • the imaging unit is provided such that an objective lens (hereinafter referred to as an observation window) located closest to the distal end among the plurality of objective lenses constituting the imaging unit is exposed from the distal end surface of the distal end portion.
  • the distal end surface has an illumination window that illuminates the interior of the subject with illumination light, a distal end opening of a known treatment instrument insertion conduit, and a distal end opening of a forward water supply conduit that supplies liquid into the subject.
  • a nozzle of an air / water supply conduit (hereinafter referred to as an AW conduit) for supplying gas or liquid to an observation window exposed from the tip surface is provided.
  • the main part of the front end part is usually composed of a front end hard member that is a main body of the front end part and a cover member that covers the outer peripheral surface and the front end surface of the front end hard member.
  • the distal end rigid member is provided with a treatment instrument insertion conduit, a forward water supply conduit, and an AW conduit, and further supplies illumination light to the illumination window.
  • a light guide is inserted, and on the distal end surface of the distal end rigid member, the above-described observation window and illumination window, the distal end opening of the treatment instrument insertion conduit, the distal end opening of the front water supply conduit, the AW conduit A nozzle or the like is provided.
  • the cover member exposes the observation window, the illumination window, the distal end opening of the treatment instrument insertion conduit, the forward opening of the front water supply conduit, and the nozzle of the AW conduit from the distal end surface of the distal end rigid member.
  • the tip surface is covered, and after the coating, the tip end surface is adhesively fixed to the outer peripheral surface and the tip surface of the tip hard member.
  • the cover member When the cover member is bonded and fixed to the hard tip member, the cover member must be attached to the hard tip member with high positional accuracy. This is because, when the cover member is assembled with respect to the distal end hard member in the XY direction or the rotational direction of the distal end hard member, the distal end opening of the treatment instrument insertion conduit described above by the cover member, This is because a part of the front end opening of the forward water supply conduit and the front end opening of the AW conduit are blocked.
  • the method of assembling the cover member with the operator's feeling has a problem that it is difficult to assemble the cover member with high positional accuracy.
  • an objective lens frame that holds a plurality of objective lenses is fixed to the distal end hard member so that the distal end side portion protrudes forward from the distal end surface of the distal end rigid member.
  • a gap is formed between the cover member and the protruding tip portion, so that the gap absorbs a dimensional error between the tip hard member and the cover member.
  • the gap causes an impact force. Further, since it is difficult for the cover member to be transmitted to the observation window through the objective lens frame to which the cover member is bonded, there is also an effect that the observation window is hardly damaged.
  • the method using positioning pins has a problem that the number of manufacturing steps increases because a separate step of inserting the positioning pins into the AW pipe line is required.
  • the cover member is displaced and covered with respect to the distal end hard member, when the impact is unexpectedly applied from the side to the distal end portion, the distal end side portion of the cover member and the objective lens frame Even if a gap is formed between the cover member and the cover member, the cover member is likely to be deformed, and the observation window is likely to be damaged due to the deformation.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide an endoscope having a configuration of a distal end portion in which a cover member is easily assembled with a distal end portion main body with high positional accuracy.
  • An endoscope includes a lens frame that holds a lens for observing the inside of a subject, and a distal end portion that is covered on the outer periphery of the lens frame and that is positioned on the distal end side in the insertion direction of the insertion portion.
  • the distal end portion main body having a positioning hole formed in the distal end surface on the distal end side in the insertion direction, the outer peripheral surface of the distal end portion main body and the lens frame, and the distal end surface of the distal end portion main body are configured from the distal end surface.
  • a cover member having a positioning member that is covered so that the lens is exposed and that is inserted into the positioning hole after the covering, and a first gap between the cover member and the outer peripheral surface of the lens frame Is set to be larger than a second gap between the cover member and the fitting portion on the outer peripheral surface of the tip end body, and the cover is placed on the fitting portion so that the second gap is eliminated.
  • Part of the member is fitted Is, by the positioning member to the positioning hole is fitted, the cover member is positioned with respect to the distal end portion main body.
  • the perspective view which shows the endoscope of this Embodiment 1 is a plan view of the distal end portion of the insertion portion of FIG. 1 viewed from the II direction in FIG.
  • part enclosed by the IV line in FIG. 3 is a view of the tip cover of FIG. 3 as viewed from the direction V in FIG.
  • Sectional view of the positioning member along line VI-VI in Fig. 5 Fig. 3 shows only the tip hard member in Fig. 3 as viewed from the VII direction in Fig. 3.
  • Sectional view of positioning hole along line VIII-VIII in Fig. 7 7 is a side view of the positioning hole in FIG. 7 when viewed from the IX direction in FIG.
  • FIG. 1 is a perspective view showing an endoscope according to the present embodiment
  • FIG. 2 is a plan view of the distal end portion of the insertion portion of FIG. 1 as viewed from the direction II in FIG. 1
  • FIG. 3 is III in FIG.
  • FIG. 4 is an enlarged cross-sectional view of a portion surrounded by line IV in FIG. 3.
  • FIG. 5 is a view of the tip cover of FIG. 3 as seen from the direction V in FIG. 3
  • FIG. 6 is a sectional view of the positioning member along the line VI-VI in FIG. 5
  • FIG. FIG. 8 is a sectional view of the positioning hole along the line VIII-VIII in FIG. 7
  • FIG. 9 is a sectional view of the positioning hole in FIG. It is the side view seen from IX direction.
  • an endoscope 1 is provided on an insertion portion 2 to be inserted into a subject and a proximal end side (hereinafter simply referred to as a proximal end side) of the insertion portion 2 in the insertion direction S.
  • the main part is composed of the operating part 6, the universal cord 7 extended from the operating part 6, and the connector 8 provided at the extending end of the universal cord 7.
  • the connector 1 can be connected to a known light source device (not shown) and the like, so that the endoscope 1 can be connected to peripheral devices.
  • the insertion portion 2 includes a distal end portion 3, a bending portion 4, and a flexible tube portion 5 in order from the distal end side, and a main portion is configured.
  • the bending portion 4 is bent in at least two directions by a bending operation knob 6 n provided in the operation portion 6, and is provided between the distal end portion 3 and the flexible tube portion 5.
  • the front end surface 3s of the front end portion 3 has a front side lens 41 (all of which are shown in FIG. 3), which is composed of a plurality of lenses 41a to 41d, which will be described later. ), An observation window 41a for observing an observation site in the subject is provided.
  • the front end opening of the front water supply conduit 84 that supplies the liquid toward the observation site to the distal end surface 3s of the distal end portion 3 and the distal end of the channel pipe 20p constituting the treatment instrument insertion conduit 20 (see FIG. 3).
  • Nozzle connected to the tip opening of an AW conduit (not shown) that removes dirt adhering to the observation window 41a by supplying gas or liquid to the opening 20k, for example, two illumination windows 81 and 82, and the observation window 41a 83 is provided.
  • the insertion portion 2 is provided from the treatment instrument insertion port 6a (see FIG. 1) to the distal end opening 20k.
  • various treatment instruments inserted from the treatment instrument insertion port 6a protrude toward the observation site.
  • the illumination windows 81 and 82 are inserted from the connector 8 connected to the light source device to a position close to the illumination windows 81 and 82 in the distal end portion 3 through the universal cord 7, the operation portion 6, and the insertion portion 2.
  • the illumination light supplied from the light source device by the light guide (not shown) is spread and irradiated on the observation site.
  • the distal end portion 3 of the insertion portion 2 includes a distal end rigid member 10 that is a distal end portion main body formed of, for example, a hard metal. 10, a plurality of through holes 10h1 to 10h5 are formed along the insertion direction S.
  • the imaging unit 200 is inserted into the through hole 10h1 so that the observation window 41a is exposed from the tip surface 3s.
  • the distal end hard member 10 has a protruding portion 10t protruding in an L-shape forward from the distal end surface 10s at a position surrounding the outer periphery of the through hole 10h1 in the distal end surface 10s. Is formed.
  • the two through holes 10h2 supply the illumination light to the two illumination windows 81 and 82 and the illumination windows 81 and 82 so that the two illumination windows 81 and 82 are exposed from the front end surface 3s.
  • the light guide is inserted.
  • the above-described AW pipe line is inserted into the through hole 10h3, the front water supply pipe line 84 is inserted into the through hole 10h4, and the treatment instrument insertion pipe line is inserted into the through hole 10h5. 20 is inserted.
  • the treatment instrument insertion conduit 20 has a channel pipe 20p inserted through the through hole 10h5 of the distal end rigid member 10 and an outer periphery on the proximal end side of the channel pipe 20p.
  • the main part is composed of the flexible tube 21 fitted and fixed.
  • a passage through which a treatment instrument can be inserted and a sucked liquid or solid can pass is formed in the space inside the channel pipe 20 p and the tube 21.
  • the proximal end of the treatment instrument insertion conduit 20 is opened at a treatment instrument insertion port 6a (see FIG. 1) of the operation unit 6.
  • the forward water supply conduit 84 and the AW conduit are inserted into the insertion portion 2, the operation portion 6 and the universal cord 7, and the base end of each conduit is connected to a base (not shown) provided in the connector 8. Yes.
  • the front lens frame 31 is fixed in the through hole 10h1 so that the tip side protrudes forward in the insertion direction S (hereinafter simply referred to as the front) from the tip surface 10s and the protruding portion 10t of the tip hard member 10. Yes.
  • a step portion 31d1 is formed in a part of the portion that is forward of the step portion 31d2 and forward of the front end surface 10s as shown in FIG. .
  • an observation window 41 a is fixed to the inner periphery of a portion 31 t that protrudes to the tip side from the step portion 31 d 1 of the front lens frame 31.
  • the protruding portion 10t described above protruding in an L shape forward from the distal end surface 10s of the distal end hard member 10 is fitted to the outer periphery of the step portion 31d1.
  • a movable lens frame 34 that holds the movable lens 44 is fitted behind the lens 41d of the front lens 41 in the insertion direction S (hereinafter simply referred to as rear).
  • the moving lens frame 34 is moved back and forth in the optical axis direction parallel to the insertion direction S in the rear lens frame 35 by a shaft member 70 which is a moving member whose tip is connected to the leg 34a of the moving lens frame 34. It has a movable configuration.
  • the distal end of the shaft member 70 is screwed and fixed to a screw hole 34ak formed along the insertion direction S in the leg portion 34a, and the base end is inserted into the insertion portion 2, It is connected to the tip end of a pulling wire 71 inserted into the operation unit 6.
  • the shaft member 70 is configured to have a larger diameter and rigidity than the pulling wire 71. Further, the fixing of the tip of the shaft member 70 to the leg 34a is not limited to screw fixing, and may be fixing using an adhesive, for example.
  • the shaft member 70 is inserted into the pipe member 63 extending along the insertion direction S in the through hole 10h1 so that the gap between the shaft member 70 and the pipe member 63 is reduced.
  • the shaft member 70 is screwed into the screw hole 34ak of the leg portion 34a from the front end side by opening the lid body 60 provided at a portion facing the shaft member of the frame 39. .
  • the pulling wire 71 is pulled and loosened by operating a zoom lever 6z (not shown) provided in the operation unit 6 (see FIG. 1).
  • the shaft member 70 fixed to the tip of the pulling wire 71 is also pulled and loosened by operating the zoom lever 6z via the pulling wire 71.
  • the moving lens 44 held by the moving lens frame 34 with the tip of the shaft member 70 screwed to the leg portion 34a is moved between the position L1 and the position L2, as shown in FIG. Move back and forth in the direction.
  • the position L1 is defined by the leg 34a coming into contact with the frame 39, and the position L2 is defined by the leg 34a coming into contact with the tip 63s of the pipe member 63.
  • the shaft member 70 is configured to have a larger diameter and rigidity than the pulling wire 71. Therefore, unlike the case where the leg portion 34a is pulled and loosened only by the pulling wire 71, even if the shaft member 70 is pushed forward and the moving lens 44 is moved to the position L1, the shaft member 70 is not bent. .
  • the shaft member 70 having a large diameter and rigidity is used for the movement of the moving lens 44, the shaft member 70 will not bend even if the moving lens 44 is pushed to the position L1, so that the moving lens frame is not bent. 34 does not tilt.
  • the shaft member 70 is inserted in the pipe member 63 so that the gap between the shaft member 70 and the pipe member 63 is reduced. Therefore, as the pulling wire 71 is pulled and loosened, the pipe member 63 is smoothly moved back and forth without looseness, so that the moving lens frame 34 does not tilt as the shaft member 70 moves back and forth. .
  • the shaft member 70 is inclined in the pipe member 63 when the shaft member 70 is moved back and forth.
  • the moving lens frame 34 may be inclined.
  • a rear lens 45 composed of a plurality of lenses is fixed behind the moving lens 44.
  • the front end side of the element frame 36 that holds the lens 46 and the cover glass 47 is inserted and fixed behind the rear lens 45 in order from the front end side.
  • the distal end side of the shield material 55 is fixed to the outer periphery on the proximal end side of the element frame 36.
  • the tip side of the heat shrinkable tube 56 that covers the rear half of the element frame 36 along the insertion direction S and the outer periphery of the shield material 55 is fixed.
  • the proximal end side of the heat shrinkable tube 56 is fixed to the outer periphery on the distal end side of the protective tube 52.
  • the protective tube 52 covers the outer periphery of the signal cable 51 to protect the signal cable 51.
  • An image sensor 49 such as a CCD is disposed together with a thermoplastic resin 57 in an airtight space closed by a shield material 55 and a heat shrinkable tube 56.
  • a cover glass 48 that protects the image pickup surface is attached to the image pickup surface of the image pickup device 49, and a cover glass 47 is attached to the front surface of the cover glass 48.
  • the outer periphery of the cover glass 47 is fixed to the inner periphery of the element frame 36.
  • the cover glass 48 and the image sensor 49 are fixed to the element frame 36 via the cover glass 47.
  • a substrate 50 on which a plurality of electronic components are mounted is provided on the back surface of the imaging element 49, and a plurality of lead wires 53 extending from the tip of the signal cable 51 are electrically connected to the substrate 50. Yes.
  • the signal cable 51 is inserted from the distal end portion 3 into the electrical contact portion in the connector 8 through the insertion portion 2, the operation portion 6, and the universal cord 7.
  • the signal cable 51 transmits an electric signal of the image of the observation site imaged by the image sensor 49 to a video processor (not shown) that is electrically connected to the light source device described above.
  • a positioning hole 100 into which a rib 90 of a cover member 15 described later is fitted is formed in the distal end surface 10 s of the distal end hard member 10.
  • the configuration of the positioning hole 100 will be described later.
  • the distal end side of the annular curved tube 12 is fixed to the proximal end side of the outer peripheral surface 10g2 in the insertion direction S of the distal end hard member 10. Further, for example, a bobbin is attached to the rear half of the outer peripheral surface 10g2 so that the distal end side of the outer skin 11 constituting the outer surface of the distal end portion 3, the curved portion 4, and the flexible tube portion 5 covers the distal end side of the reinforcing tube 12. It is fixed by etc.
  • the distal end side of the outer peripheral surface 10g2 of the distal end rigid member 10 is closer to the distal end than the outer skin 11, the outer peripheral surface 10g1 (see FIG. 4) which is the fitting portion K of the protruding portion 10t, the distal end surface 10s, and the distal end surface of the protruding portion 10t 10ts (see FIG. 4) and an outer periphery of a portion 31t on the tip side of the step portion 31d1 to which the protruding portion 10t of the front lens frame 31 is fitted, as shown in FIG.
  • the cover member 15 made of, for example, resin is covered so that the illumination windows 81 and 82, the nozzle 83, the front end opening of the forward water supply conduit 84, and the front end opening 20k of the channel pipe 20p are exposed from the front end surface 3s. And fixed by an adhesive or the like.
  • the first gap a1 between the outer peripheral surface 31g of the front end side portion 31t and the cover member 15 with respect to the step portion 31d1 of the front lens frame 31 is the hard end member 10. Is set to be larger than the second gap a2 between the outer peripheral surface 10g1 of the protruding portion 10t and the step portion 15d of the cover member 15 (a1> a2).
  • the cover member 15 is fitted with the step portion 15 d of the cover member 15 on the outer peripheral surface 10 g 1 of the protruding portion 10 t so that the second gap a 2 is eliminated after covering.
  • the cover member 15 is positioned with respect to the distal end hard member 10 by the fitting.
  • the first gap a1 is formed larger than the second gap a2
  • a dimensional error has occurred in the outer peripheral surface 10g1 or the step portion 15d of the cover member 15 fitted to the outer peripheral surface 10g1. This is because the first gap a1 absorbs the error within a predetermined tolerance.
  • outer peripheral surface 10g1 of the protrusion 10t and the step portion 15d of the cover member 15 fitted to the outer peripheral surface 10g1 are used for positioning, they are formed with high dimensional accuracy.
  • the first gap a1 is secured, so that precise dimensional accuracy is not required.
  • the third gap a3 between the outer peripheral surface 10g2 of the distal end hard member 10 and the cover member 15 is also formed to be larger than the second gap a2. (A3> a2). Note that an adhesive is injected into the first gap a1 and the third gap a3 after the cover member 15 is assembled.
  • the first gap a1 is formed, when an impact force is unexpectedly applied from the side to the distal end portion 3, the force applied to the cover member 15 is the first gap. Since it is not directly transmitted to the front lens frame 31 by a1, it is possible to prevent the observation window 41a from being damaged.
  • a triangular prism-shaped rib 90 that is a positioning member having an inclined surface 90 k having a certain area is formed so as to connect the inner surface 15 an and the inner surface 15 bn.
  • the rib 90 may be formed integrally with the inner surface 15an and the inner surface 15bn or may be formed separately. Further, when the rib 90 is formed integrally with the inner surface 15an and the inner surface 15bn, the rib 90 is formed so as to connect the inner surface 15an and the inner surface 15bn. Therefore, the rib 90 can be easily formed.
  • the positioning member is not limited to the rib 90, but may be a pin-shaped member formed on the cover member 15.
  • the cover member is made of resin, and the pin has a small diameter and is elongated. Since it has a shape, when molding a pin integrally with the cover member 15, the resin does not flow well and cannot be formed with high precision. Therefore, it is not preferable to use the positioning member as a pin.
  • the positioning member is formed by a pin, a hole into which the pin is inserted is formed in the distal end surface 10s.
  • the rib 90 covers the positioning member 100 (see FIG. 7) formed in the distal end surface 10 s of the distal end hard member 10 after the cover member 15 is coated on the distal end hard member 10. It is inserted from the direction of arrow Q.
  • the positioning hole 100 is formed in the same size as the rib 90 along the shape of the rib 90 between the tip surface 10 s and the outer peripheral surface 10 g 2 at a position facing the rib 90.
  • the inner side surface 100n is formed so that the side surface (not shown) of the rib 90 is in surface contact. After the rib 90 is fitted into the positioning hole 100, the rib 90 constitutes a part of the outer peripheral surface 10g2.
  • a chamfered portion 100 m is formed in the positioning hole 100 so that the rib 90 can be easily fitted into the positioning hole 100.
  • the rib 90 is inserted into the positioning hole 100 and, as described above, a part of the cover member 15 is fitted to the outer peripheral surface 10g1 of the protruding portion 10t of the distal end hard member 10 to thereby cover the distal end hard member 10.
  • the member 15 is positioned with high accuracy.
  • the contact area is larger than when a pin is used.
  • the cover member 15 can be positioned.
  • the first gap a1 between the outer peripheral surface 31g of the front end portion 31t of the front lens frame 31 and the cover member 15 is the outer periphery of the protruding portion 10t of the front end hard member 10. It is shown that it is set to be larger than the second gap a2 between the surface 10g1 and the step portion 15d of the cover member 15 (a1> a2).
  • the stepped portion 15d of the cover member 15 is fitted to the outer peripheral surface 10g1 of the protruding portion 10t so that the second gap a2 is eliminated. Since the first gap a1 is formed larger than the second gap a2 when the cover member 15 is positioned with respect to the outer peripheral surface 10g1, the stepped portion of the cover member 15 fitted to the outer peripheral surface 10g1 Even if a dimensional error occurs in 15d, the first gap a1 absorbs the error within a predetermined tolerance, so that the cover member 15 can be covered with high positional accuracy without any deviation.
  • the tip hard member 10 is covered with the cover member 15, It has been shown that the cover member 15 is positioned relative to the distal end hard member 10 by fitting the rib 90 formed in the cover member 15 into the positioning hole 100 formed in the distal end surface 10 s of the distal end hard member 10.
  • the position of the cover member 15 is precisely defined by the rib 90 in the XY direction and the rotation direction of the distal end hard member 10. Accordingly, the cover member 15 can be covered with higher positional accuracy than the configuration in which the step portion 15d of the cover member 15 is merely fitted to the outer peripheral surface 10g1 of the protruding portion 10t of the distal end hard member 10.
  • the cover member 15 can be covered with high accuracy on the tip hard member 10 by a simple process of simply covering the tip hard member 10 with the cover member 15. Therefore, the backlash after the cover member 15 is coated on the distal end hard member 10 can be suppressed to a range that satisfies the desired assembly accuracy.
  • the configuration in which the plurality of lenses 41, 44, 45, 46 are provided in the distal end portion 3 is shown, but it is needless to say that the configuration is not limited thereto. That is, it goes without saying that the present invention may be applied to a configuration in which only one lens is provided, or may be applied to a configuration in which the moving lens 44 is not provided.
  • an electronic endoscope in which the imaging element 49 is provided in the distal end portion 3 is shown as an example, but it is needless to say that the configuration is not limited to the electronic endoscope. is there.
  • the present invention is not limited to this, and without using the light guide, It goes without saying that a light emitting element such as an LED may be provided on the front end surface 3s.
  • At least one lens in the objective lens group for observing a subject constitutes a moving lens that can move back and forth with respect to the optical axis direction of the objective lens group, thereby changing the observation magnification of the objective lens group.
  • an endoscope that can A moving lens frame for holding the moving lens; A moving member that moves the moving lens frame back and forth in the optical axis direction; Comprising The moving member is a shaft member that can move back and forth in the optical axis direction as the wire is pulled or loosened, and the shaft member has a larger diameter than the wire and is more rigid than the wire. Endoscope.
  • endoscopes have been widely used in the medical field and industrial field.
  • the endoscope can observe the inside of the subject by inserting an elongated insertion portion into the subject.
  • An endoscope for example, an insertion portion of an electronic endoscope has a distal end portion on the distal side in the insertion direction, from an objective optical system including a plurality of objective lenses for observing the inside of the subject and a solid-state imaging device such as a CCD.
  • an imaging unit configured is provided, and an electronic endoscope has a configuration in which an image of an observation site in a subject imaged by an objective optical system is captured by a solid-state imaging device. It has become.
  • the movable lens is moved in the optical axis direction.
  • the optical depth of the objective optical system can be varied, such as the depth of focus, imaging magnification, and viewing angle.
  • the structure allows normal to magnified observation of the surface of the observation site from 1 to 100 times.
  • the zoom endoscope provided is also well known.
  • an endoscope in Japanese Patent Laid-Open No. 2000-292712, includes a lens frame that holds a moving lens, a leg portion that protrudes radially outward from the lens frame, and the leg portion. And a wire fixed to a focus adjustment lever (hereinafter referred to as a zoom lever) provided at the operation portion of the endoscope.
  • a focus adjustment lever hereinafter referred to as a zoom lever
  • the wire is inserted into the pipe member, and the leg is brought into contact with the tip of the pipe member so that the rearmost moving position of the moving lens is defined.
  • the tilted lens frame may be difficult to move in the frame that holds the lens frame movably. There has been a problem that the mobility of the is reduced.
  • An object of the present invention is to provide an endoscope.

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  • Endoscopes (AREA)

Abstract

L'invention concerne un endoscope comprenant : un cadre de lentilles avant (31) ; un élément dur d'extrémité avant (10) déposé sur la périphérie extérieure du cadre de lentilles (31) et doté d'un trou de positionnement ménagé dans la surface d'extrémité avant ; et un élément de revêtement (15) déposé sur les périphéries extérieures de l'élément dur d'extrémité avant (10) et du cadre de lentilles (31) et sur une surface d'extrémité avant (10s) et doté d'un élément de positionnement ajusté dans le trou de positionnement après le revêtement. Un premier espace (a1) entre l'élément de revêtement (15) et la surface périphérique extérieure du cadre de lentilles (31) est réglé de façon à être plus large qu'un second espace (a2) entre l'élément de revêtement (15) et la surface périphérique extérieure de l'élément dur d'extrémité avant (10).
PCT/JP2011/066953 2010-08-02 2011-07-26 Endoscope Ceased WO2012017861A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-173863 2010-08-02
JP2010173863 2010-08-02

Publications (1)

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WO2012017861A1 true WO2012017861A1 (fr) 2012-02-09

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PCT/JP2011/066953 Ceased WO2012017861A1 (fr) 2010-08-02 2011-07-26 Endoscope

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WO (1) WO2012017861A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015073689A (ja) * 2013-10-08 2015-04-20 富士フイルム株式会社 内視鏡
JP2015119746A (ja) * 2013-12-20 2015-07-02 富士フイルム株式会社 内視鏡
JP2023168944A (ja) * 2022-05-16 2023-11-29 Hoya株式会社 内視鏡

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04158825A (ja) * 1990-10-23 1992-06-01 Olympus Optical Co Ltd 内視鏡
JP2001083436A (ja) * 1999-09-14 2001-03-30 Fuji Photo Optical Co Ltd 内視鏡の挿入部
JP2002085326A (ja) * 2000-09-14 2002-03-26 Olympus Optical Co Ltd 内視鏡
JP2010115428A (ja) * 2008-11-14 2010-05-27 Olympus Medical Systems Corp 内視鏡

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04158825A (ja) * 1990-10-23 1992-06-01 Olympus Optical Co Ltd 内視鏡
JP2001083436A (ja) * 1999-09-14 2001-03-30 Fuji Photo Optical Co Ltd 内視鏡の挿入部
JP2002085326A (ja) * 2000-09-14 2002-03-26 Olympus Optical Co Ltd 内視鏡
JP2010115428A (ja) * 2008-11-14 2010-05-27 Olympus Medical Systems Corp 内視鏡

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015073689A (ja) * 2013-10-08 2015-04-20 富士フイルム株式会社 内視鏡
JP2015119746A (ja) * 2013-12-20 2015-07-02 富士フイルム株式会社 内視鏡
JP2023168944A (ja) * 2022-05-16 2023-11-29 Hoya株式会社 内視鏡

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