JP5059663B2 - Endoscope illumination mechanism and method for assembling endoscope illumination mechanism - Google Patents

Description

  The present invention relates to an endoscope illumination mechanism provided in an endoscope used for medical purposes and an assembly method thereof.

  The endoscope includes a main body operation unit that is operated by an operator, an insertion unit that is inserted into a body cavity, and a universal cord that is detachably connected to a processor device that is a light source device and a video signal processing device. It is configured with. The distal end of the insertion portion is provided with a hard tip portion, and the hard tip portion is provided with an endoscope observation portion including at least an observation portion and an illumination portion, so that the hard tip portion is directed in a desired direction. The bending tube portion can be bent by remote operation from the main body operation portion.

  A structure of a hard tip portion including an observation portion and an illumination portion is disclosed in FIG. The observation unit includes an objective lens group including a plurality of objective lenses in the lens barrel, a prism (triangular prism) fixed to the end surface of the lens barrel, and a solid fixed to the exit surface side of the prism. The imaging device is provided with an image sensor. There are two types of solid-state imaging devices: a type arranged in a direction perpendicular to the axial direction and a type arranged in a direction parallel to the axial direction. Therefore, as shown in FIG. 3 of Patent Document 1, the insertion portion is reduced in diameter by being arranged in a direction parallel to the axial direction. For this purpose, a prism is provided, and the optical path is bent 90 degrees in order to guide the light from the objective lens group to the solid-state imaging device.

On the other hand, the illumination unit is configured to include a light guide in which ultrafine optical fibers are bundled and an illumination lens that is disposed to face the emission end face of the light guide, and in order to prevent uneven illumination, More than that. In addition to the observation part and the illumination part, the distal hard part is provided with a treatment instrument insertion channel for inserting forceps, a high-frequency treatment instrument and other treatment instruments, and a cleaning nozzle for cleaning the distal end surface. Some are equipped.
JP 2005-58571 A

  In medical endoscopes, in order to reduce the burden on the subject and improve the insertion operability, it is desired to reduce the diameter of the insertion portion and at the same time to shorten the distal end hard portion. . In particular, rigid endoscopes such as maxillary sinus and arthroscopes that have a curved portion need not only reduce the diameter, but also require a small bending motion, The length must be greatly shortened.

  As described above, the observation unit including the objective lens group, the prism, and the solid-state imaging device occupies a wide space both in the axial direction and in the radial direction, and the light guide that constitutes the illumination unit is also provided in the hard tip portion. Has been inserted. The light guide is fixed to a cylindrical base and attached to the hard tip portion, and the light guide extends linearly from the opening of the base. And since a solid-state image sensor (especially fixed board | substrate) is located in the direction where a light guide extends, a light guide and a fixed board | substrate interfere. In particular, when trying to reduce the diameter and shorten the hard end portion, each member is in a dense state, and the opening of the base and the fixed substrate are in a very close positional relationship. For this reason, the light guide and the fixed substrate come to strongly interfere with each other, and the light guide must be bent sharply to avoid the fixed substrate.

  However, the optical fiber constituting the light guide is ultra-fine glass and can be bent slightly, but since it is a glass material in the first place, it does not have flexibility in the bending direction. That is, the light guide in which the optical fibers are bundled has almost no flexibility and cannot be bent unless a very strong force is applied. Moreover, even if it is forced to bend, the force to be linearized acts strongly by the restoring force, so it cannot be bent rapidly. Then, the light guide must be gently bent to avoid the fixed substrate. As a result, the tip hard portion becomes long, and the tip hard portion cannot be shortened.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the diameter and shorten the hard tip portion so that the light guide does not interfere with a fixed substrate or the like.

  In order to solve the above problems, in the endoscope illumination mechanism according to claim 1 of the present invention, the exit end of the light guide made of the fiber bundle is faced to the illumination lens attached to the through hole formed in the hard tip portion. An endoscope illumination mechanism, which is a fixed pipe having a linear passage in which the light guide is inserted, the distal end portion thereof is fixed to the distal end hard portion, and which is attached to the through hole in the axial direction. And a guide pipe having a linear passage that is inserted into the light guide and joined to the base end side of the fixed pipe, and has at least one joint end surface of the fixed pipe and the guide pipe It is characterized by being cut obliquely.

  According to this endoscope illumination mechanism, the guide pipe joined to the fixed pipe in the axial direction is axially cut by obliquely cutting the joining end surface of at least one of the fixed pipe and the guide pipe. It will be in a state inclined with respect to it. Therefore, even if the light guide is largely raised obliquely by the guide pipe and another member is arranged in the axial direction of the fixed pipe, the light guide is extended so as to avoid the member. Interference between the light guide and other members can be avoided.

  An endoscope illumination mechanism according to a second aspect of the present invention is the endoscope illumination mechanism according to the first aspect, wherein the hard tip portion is connected to a lens barrel provided with a plurality of objective lenses, and the lens barrel. And a solid-state imaging device fixed to a substrate connected to the prism, and the light guide extending from the guide pipe is formed on the joint pipe end surface of the fixed pipe and / or the guide pipe, The substrate is cut at an angle that avoids the substrate and the solid-state imaging device.

  According to this endoscope illumination mechanism, since the joint end face is cut at an angle that avoids the solid-state imaging device and the substrate, it is possible to prevent the light guide, the solid-state imaging device, and the substrate from interfering with each other. it can.

  In the method for assembling the endoscope illumination mechanism according to claim 3 of the present invention, the exit end of the light guide formed of the fiber bundle is made to face the illumination lens mounted in the through hole formed in the distal end hard portion of the endoscope insertion portion. An endoscope illumination mechanism assembling method for assembling an endoscope illumination mechanism, wherein two tubular pipes having a linear passage are defined as a fixed pipe and a guide pipe, and the fixed pipe and the guide pipe are Cutting at least one end face obliquely, inserting the fixed pipe and the guide pipe into the light guide such that the end faces are connected, and connecting the fixed pipe and the guide pipe Forming an adhesive at a site, joining the fixed pipe and the guide pipe so that the end surface becomes a joint surface, and attaching the fixed pipe to the through hole; To have, and wherein.

  According to this assembly method of the endoscope illumination mechanism, since the fixed pipe and the guide pipe have a straight passage, the light guide can be inserted as it is in the straight state. Since the guide pipe can be easily joined, the endoscope illumination mechanism can be easily assembled.

  In the endoscope illumination mechanism of the present invention, the light guide is removed from the fixing base attached to the distal end hard portion by obliquely cutting at least one joint end surface of the fixing base and the guide base. Maintained and fixed in a posture raised by a predetermined angle from the axial direction by the guide base, avoiding interference between the light guide and the solid-state image sensor or fixed substrate while reducing the diameter and shortening of the hard tip Will be able to. In addition, the method for assembling the endoscope illumination mechanism according to the present invention is such that the light guide is inserted into the fixing base having a linear passage and the guide base in a straight state, and then the both ends are joined together. Since it is attached to the hard part, it can be easily assembled.

  Embodiments of the present invention will be described below with reference to the drawings. The endoscope shown in FIG. 1 includes an insertion portion 1, a main body operation portion 2, and a universal cord 3. The insertion portion 1 includes a distal end hard portion 1a, a curved tube portion 1b, and a rigid portion 1c. I have. The main body operation unit 2 is provided for an operator who operates the endoscope to hold and operate the endoscope. The main body operation unit 2 is connected to the base end portion of the rigid portion 1c. One end of the universal cord 3 is connected to the main body operation unit 2, and the other end is a connector 3a for connecting to a processor device (not shown) and a connector 3b for connecting to a light source device (not shown). The main body operation unit 2 includes a bending operation knob 2a that performs an operation for bending the bending tube portion 1b in the vertical direction or the horizontal direction.

  As shown in FIG. 2, the observation portion 4 is provided at one location and the illumination portions 5 are provided at two locations on the distal end surface of the distal end hard portion 1 a in the insertion portion 1. Therefore, observation of the body cavity from the observation unit 4 is performed under illumination light from the illumination unit 5 with the insertion unit 1 inserted into the body cavity. In the present embodiment, a rigid mirror having only the observation unit 4 and the illumination unit 5 is illustrated and described at the distal end hard portion 1a. However, the present invention is not limited to the rigid mirror, and a flexible mirror having a flexible tube portion is used. The present invention can also be applied to this. Further, a member such as a treatment instrument insertion channel for inserting forceps, a high-frequency treatment instrument and other treatment instruments, and a cleaning nozzle for cleaning the observation unit 4 may be provided.

  FIG. 3 shows a cross section of the distal end structure of the endoscope of the present invention. The distal end hard portion 1a includes a distal end portion main body 6 and a distal end ring 7, and the distal end portion main body 6 has a plurality of through holes formed in the axial direction. Further, the inside of the tip ring 7 is a space. And each through-hole provided in the front-end | tip part main body 6 becomes a structure which supports each mechanism part including the observation part 4 and the illumination part 5, and these each mechanism part is extended inside the front-end | tip ring 7. FIG. ing.

  The observation unit 4 will be described. The observation unit 4 includes an observation lens 11, a lens barrel 12, a prism 13, a solid-state imaging device 14, a fixed substrate 15, and a signal cable 16 and is schematically configured. The observation lens 11 is a lens facing the distal end surface of the distal end hard portion 1a, and an objective lens group including a plurality of lenses is attached to the lens barrel 12. In addition, a prism 13 is connected to the base end side of the lens barrel 12 in order to direct the imaging surface of the solid-state imaging device 14 in the axial direction of the insertion portion 1. The prism 13 is a reflective triangular prism having a slope as a reflecting surface, a lens barrel 12 connected to the incident surface side, and a solid-state image sensor 14 connected to the emitting surface side. Therefore, the light incident from the objective lens group in the observation lens 11 and the lens barrel 12 is incident on the solid-state image sensor 14 with the optical path bent by 90 degrees by the prism 13. The solid-state imaging device 14 is fixed to a fixed substrate 15 and photoelectrically converts incident light to generate a video signal. A plurality of wirings connected to the electrodes of the solid-state imaging device 14 are formed on the fixed substrate 15, and the plurality of signal lines connected to the wirings are included in the signal cable 16 and guided to the connector 3a. 3a and the processor device are connected, and a video signal is output to the processor device.

  The illumination unit 5 will be described. The illumination unit 5 includes an illumination lens 21, a guide tube 22, a fixing base 23, and a guide base 24, and is schematically configured. The illumination lens 21 is a lens for supplying illumination light to a region to be examined. The illumination lens 21 is configured such that an emission end face of a light guide F in which a large number of fibers are bundled is opposed to the illumination lens 21. The guide tube 22 is an insertion member including the light guide F. The light guide F is contained in the guide tube 22 up to the vicinity of the connection portion between the distal end hard portion 1a and the bending tube portion 1b, and the light guide F is exposed at the distal end side. By exposing the light guide F, the thickness of the guide tube 22 is reduced, and the distal end hard portion 1a is thereby made thinner. In addition, in the distal end hard portion 1a, the illumination unit 5 is preferably provided at two or more places in order to prevent the occurrence of illumination unevenness, but may be provided at one place.

  As shown in FIGS. 3 and 4, the light guide F is inserted into two caps, a fixing cap 23 and a guide cap 24, and led to the illumination lens 21. The fixing base 23 is a cylindrical pipe member having a linear passage inside. The fixing base 23 is fixed by being attached to the through hole of the tip body 6, and the light guide F is inserted into the internal space. The exit end face of the light guide F is guided to the illumination lens 21 by the fixing base 23. The fixing base 23 mounted in the through hole of the tip body 6 is oriented in the axial direction, and the light guide F is also oriented in the axial direction in the internal space of the fixing base 23.

  The guide base 24 is also a pipe member having a linear passage inside like the fixing base 23, but one end face thereof is cut obliquely. When the distal end surface of the fixing base 23 is 23T, the proximal end surface is 23B, the distal end surface of the guide base 24 is 24T, and the proximal end surface is 24B, the distal end surface 24T of the guide base 24 is The cut end is formed by obliquely cutting one end face from a cylindrical pipe member. Then, the fixing base 23 and the guide base 24 are joined with an adhesive so that the proximal end face 23B and the distal end face 24T become a joining face.

  Since the distal end side surface 24T of the guide base 24 is an obliquely cut surface, when the guide base 24 is joined to the fixing base 23, the guide base 24 is inclined with respect to the fixing base 23. On the other hand, as shown in FIG. 3, the fixing base 23 is a base for mounting and fixing in the through hole provided in the distal end portion main body 6 of the distal end hard portion 1 a, so that it is in a state of being oriented in the axial direction. Fixed. Therefore, the guide base 24 rises obliquely with respect to the axial direction, and the light guide F inserted therein also rises obliquely with respect to the axial direction.

  At this time, as is apparent from FIGS. 3 and 4, the distal end hard portion 1a is inserted with the members for the observation portion 4 and the illumination portion 5, and in order to reduce the diameter, the distal end hard portion The filling rate of the part 1a becomes extremely high. For this reason, there is almost no space between the light guide F and the fixed substrate 15 in the circumferential direction. In addition, rigid endoscopes such as maxillary sinus and arthroscopes are required to have a very small turning ability due to the particularity of the part to be inserted. There is no room in the space between the guide F and the fixed substrate 15. Then, since each member is arranged in a state where there is almost no margin in both the axial direction and the circumferential direction, the light guide F and the fixed substrate 15 are in extremely close contact with each other.

  At this time, when the light guide F is fixed only by the fixing base 23 (the state where the guide base 24 is not provided), the light guide F must be suddenly raised to avoid the fixed substrate 15. The light guide F has almost no flexibility, and if it is forced to bend, a force to linearize by a restoring force acts. If there is a certain distance between the fixing base 23 and the fixed substrate 15, the light guide F can be gently bent and avoided from the fixed substrate 15, so that the restoring force does not act so strongly. However, when the distal end hard portion 1a is thin and short, since the fixing base 23 and the fixed substrate 15 are in a very close positional relationship, the light guide F is bent suddenly to fix the fixed substrate 15. Must be avoided from. Then, due to the restoring force of the light guide F, the two strongly interfere with each other.

  Therefore, the guide base 24 is connected to the fixing base 23, and the light guide F is also inserted into the guide base 24. The guide base 24 rises in the axial direction, and the light guide F inserted in the guide base 24 is also maintained and fixed in the raised state in the axial direction. Therefore, it is possible to adopt an arrangement mode that avoids the fixed substrate 15 without difficulty. That is, the fixing base 23 exhibits a fixing function for fixing the tip of the light guide F to the illumination lens 21 mounted in the through hole of the tip hard portion 1a, and the guide base 24 is in the axial direction. The guide function for guiding the light guide F in the inclined direction is exhibited. At this time, the cutting angle of the distal end surface 24T of the guide base 24 is set such that the light guide F led out from the guide base 24 does not interfere with the fixed substrate 15 or the solid-state image sensor 14.

  As shown in FIG. 3, the signal cable 16 that includes a large number of signal lines and the guide tube 22 that includes the light guide F are bundled into a single tube 30 and guided to the proximal end side. On the proximal end side, the signal cable 16 and the light guide F of the guide tube 22 are pulled out from the tube 30, the signal cable 16 is connected to the connector 3a of the universal cord 3, and the light guide F is connected to the connector 3b. . The bending tube portion 1b has a node ring structure having a predetermined length by sequentially pivoting the ring 31 formed in a ring shape, and an outer skin layer 32 is provided on the outer periphery of the node ring structure. Provided. The most advanced bending ring 31 can be attached to the distal end ring 7, and by attaching and fixing the distal end ring 7 to the most advanced bending ring 31, the distal end hard portion 1a is connected to the bending tube portion 1b. Further, the most distal end of the outer skin layer 32 is fixed by the fastening ring 33. A cut-out portion 34 is formed on the inner periphery of the curved ring 31, and the distal end of the operation wire 35 is fixed to the cut-out portion 34. By operating the bending operation knob 2a on the hand side, the operation wire 35 is pushed and pulled to bend the bending tube portion 1b, and the bending operation allows the distal end hard portion 1a to be bent in a desired direction. To be able to turn to

  As described above, the guide base 24 is connected to the fixing base 23, and the end face 24T is formed by cutting the end face of the guide base 24 obliquely so that the light guide F is in the axial direction. Thus, the stationary substrate 15 and the solid-state imaging device 14 can be avoided. Thereby, the diameter and shortening of the distal end hard portion 1a can be achieved without interference between the light guide F and each member such as the fixed substrate 15 which is a constituent member of the observation unit 4.

  Next, an assembling method of the endoscope illumination mechanism will be described. First, in the guide base 24, one end face of a cylindrical pipe member is cut obliquely to form a tip end face 24T having an oblique cut face. Further, the distal end ring 7 is connected to the most advanced bending ring 31 of the bending tube portion 1b, and the guide tube 22 and the signal cable 16 are exposed from the distal end side of the distal end ring 7.

  Then, the guide base 24 is fitted into the light guide F. At this time, the guide base 24 is fitted to the light guide F from the base end face 24B. However, since the guide base 24 is a pipe member having a linear passage inside, the light guide F is curved. Without fitting, it is fitted in a straight state. Next, the fixing base 23 is fitted. Since the fixing base 23 is a cylindrical pipe member, it may be inserted from either side of both end faces, and the front end face after insertion becomes the front end side face 23T and the base end face. Becomes the base end side end face 23B. Since the fixing base 23 is also a pipe member having a linear passage inside, the light guide F is fitted in a straight state without being bent. That is, the guide base 24 and the fixing base 23 can be fitted into the light guide F very easily. As a result, the light guide F is inserted into the guide base 24 and the fixing base 23 as shown in FIG. When the light guide F is inserted into the fixing base 23 and the guide base 24, it is desirable to fix the tip of the light guide F with an adhesive or the like.

  Next, the fixing base 23 and the guide base 24 are joined. First, an adhesive is formed on the base end side end face 23B of the fixing base 23, the front end side end face 24T of the guide base 24, and the light guide F between the bases. Then, the fixing base 23 and the guide base 24 are joined together so that the proximal end face 23B and the distal end face 24T are pressure-bonded. When the fixing base 23 and the guide base 24 are pressure-bonded, the distal end side surface 24T of the guide base 24 is formed to be a slope, so that the fixing base 23 and the guide base 24 are at a predetermined angle. Inclined state.

  Here, since the light guide F inserted into the fixing base 23 and the guide base 24 is in a curved state, the restoring force of the light guide F acts on both bases. In particular, since the light guide F is bent sharply, the acting restoring force is strong. At this time, if the fixing base 23 and the guide base 24 are thickened to secure the connection strength of both bases (that is, the connection strength is increased by increasing the contact area), the distal end hard portion 1a has a large diameter. Turn into. In the present invention, an adhesive is formed on the portion of the light guide F between the fixing base 23 and the guide base 24, and the adhesive spreads the light guide F by capillary action, and the fixing base 23. Then, the adhesive spreads throughout the guide base 24. Accordingly, the fixing base 23, the guide base 24, and the light guide F are firmly fixed and are completely fixed, and since both bases can be thin, the overall diameter is small. Can be achieved. Then, by mounting and fixing the distal end side end surface 23T of the fixing base 23 to the through hole of the distal end portion main body 6, the mounting of the illumination unit 5 to the distal end portion main body 6 is completed. At this time, the guide base 24 is fixed to the fixing base 23 in a state where the guide base 24 is raised at a predetermined angle. Then, the endoscope illumination mechanism can be assembled by fitting and fixing the distal end body 6 fitted with the observation unit 4 and the illumination unit 5 to the distal ring 7.

  Here, when the fixing base 23 and the guide base 24 are formed by a single member, that is, when one base having a curved shape is used, the fixing base 23 and the guide base 24 described above are used. Comparison with the case of using the two caps will be described. Since the light guide F has almost no flexibility, the light guide F can be bent if it is strongly bent at one point. However, when the light guide F is inserted from the end face of the base having a curved shape, it must be bent at an intermediate portion only by the pushing force, but the force sufficient to bend the light guide F acts only by the pushing force. I can't let you. In particular, in order to reduce the diameter of the hard tip portion 1a, the base for inserting the light guide F should be as thin as possible, that is, have the minimum diameter necessary for inserting the light guide F. ing. Even if the light guide F having little flexibility is inserted into such a thin base, the traveling direction of the light guide F cannot be changed at the curved portion of the base.

  In the present invention, when both the fixing base 23 and the guide base are inserted, the light guide F is inserted straight into the two pipe members having the straight passages, which is extremely easy. Can be inserted.

  Here, in the embodiment described above, the end face 24T is formed by obliquely cutting the end face of the guide base 24 out of the fixing base 23 and the guide base 24. The end face may be cut obliquely. Here, when the end face of either the fixing base 23 or the guide base 24 is cut obliquely, the cylindrical end face and the inclined end face are joined, and the opening areas of the end faces are the same. Therefore, pipes having different diameters are used for the fixing base 23 and the guide base 24.

  However, as shown in FIG. 6, if the end surfaces of both the fixing base 23 and the guide base 24 are cut obliquely at the same angle, the same pipe member can be used and the fixing base is used. 23 and the guide base 24 can be connected in a sealed state. That is, in the example shown in FIG. 5, only the guide base 24 is responsible for the inclination angle necessary for starting up the light guide F. However, as shown in FIG. 6, this function is performed by the fixing base 23 and the guide base. By providing both the base 24 and the base 24, both bases can be generated from the same pipe member having the same diameter.

  Further, when the fixing base 23 and the guide base 24 are joined to the through hole provided in the distal end body 6 when the fixing base 23 is attached to the base end part of the through hole, It is desirable to set the position immediately after that. That is, by setting the fixing base 23 to the minimum necessary length, the distance between the base end side end face 23B of the fixing base 23 and the fixing substrate 15 can be secured, and the light guide F is bent more than necessary. Do not let it. Thereby, the effect | action of the restoring force by the light guide F can be reduced.

  As shown in FIG. 2, the arrangement of the observation unit 4 and the illumination unit 5 in the distal end hard portion 1 a is such that two illumination units 5 are arranged around the observation unit 4. The observation unit 4 is provided with a prism 13 for bending light from the objective lens group attached to the lens barrel 12, and the prism 13 is a triangular prism-shaped member. On the other hand, the distal end hard portion 1a is a cylindrical member. Accordingly, the hard tip portion 1a having a curved surface shape and the triangular prism prism 13 cannot be brought into close contact with each other, and due to the difference in shape, as shown in FIG. Dead spaces are formed (as shown in the figure, dead spaces are generated on both sides of the prism 13). Therefore, in the present invention, the light guide F is extended toward the space formed on both sides of the prism 13. That is, it is desirable that the guide base 24 be directed so that the light guide F passes through the space, and the angle at which the guide base 24 faces the space between the side surface of the prism 13 and the distal end hard portion 1a. Thus, it is desirable to form the end face of the fixing base 23 and / or the guide base 24 that is cut obliquely. As a result, the dead space can be effectively used as a space for passing the light guide F.

1 is an overall configuration diagram of an endoscope. FIG. It is a figure which shows the front end surface of the front-end | tip hard part of an endoscope. It is sectional drawing which shows a front-end | tip part structure. It is a figure explaining the positional relationship of an illumination means and an observation means. It is a figure for demonstrating the assembly method of an endoscope illumination mechanism. It is a figure for demonstrating the assembly method of the endoscope illumination mechanism at the time of using the nozzle | cap | die for a base different from the example of FIG. It is AA sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 1a Tip rigid part 1b Curved tube part 1c Flexible tube part 4 Observation part 5 Illumination part 6 Tip part main body 7 Tip ring 14 Solid-state image sensor 15 Fixed substrate 16 Signal cable 22 Light guide 23 Fixing base 24 Guide base 24 24T Tip side end face F Light guide

Claims (3)

An endoscope illumination mechanism in which an exit end of a light guide made of a fiber bundle faces an illumination lens attached to a through-hole formed in a distal end hard part,
A fixed pipe having a linear passage that is inserted into the through hole in the axial direction, with the light guide inserted therein, fixing the distal end portion thereof to the distal end hard portion;
The light guide is inserted, and a guide pipe having a linear passage joined to the proximal end side of the fixed pipe,
An endoscope illumination mechanism characterized in that at least one joint end surface of the fixed pipe and the guide pipe is cut obliquely. The distal end hard portion includes a lens barrel provided with a plurality of objective lenses, a prism connected to the lens barrel, and a solid-state imaging device fixed to a substrate connected to the prism,
The joint end surface of the fixed pipe and / or the guide pipe is cut at an angle that avoids the substrate and the solid-state imaging device of the light guide extending from the guide pipe. The endoscope illumination mechanism according to 1. An assembly method for an endoscope illumination mechanism that assembles an endoscope illumination mechanism in which an exit end of a light guide made of a fiber bundle is faced to an illumination lens mounted in a through hole formed in a distal end hard portion of an endoscope insertion portion. There,
Two cylindrical pipes having straight passages are fixed pipes and guide pipes, and at least one end face of the fixed pipes and the guide pipes is cut obliquely;
Inserting the fixed pipe and the guide pipe into the light guide such that the end faces are connected;
Forming an adhesive at a connection portion between the fixed pipe and the guide pipe, and joining the fixed pipe and the guide pipe so that the end face becomes a joint surface;
Attaching the fixed pipe to the through hole;
A method of assembling an endoscope illumination mechanism characterized by comprising:

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