JP4445795B2 - Endoscopic observation aid, method for producing endoscopic observation aid, and endoscopic observation method - Google Patents

Description

  The present invention relates to an endoscope observation aid used for observing an internal state of a container, a pipe line, and the like with an endoscope, and further, a method for manufacturing the endoscope observation aid and the endoscope. The present invention relates to an endoscopic observation method using an observation aid.

Conventionally, in vessels such as tanks and pipes such as pipes, an observation window (hereinafter referred to as an observation window) is provided for visually observing the internal state from the outside, and an endoscope is provided through this window. Observing internal conditions (such as the state of the inner wall surface and the flow of fluid).
An endoscope used for such observation is provided with an observation optical system and an illumination optical system side by side at the distal end thereof. One observation optical system has an imaging unit such as a CCD, and the internal situation captured here is converted into a television image by a processor, and this image can be projected on a television monitor and visually observed. Further, a light guide fiber and a light source lamp are connected to the other illumination optical system so that a clear image can be obtained by widely illuminating the observation range of the above-described observation optical system.

As a conventional technique related to the above-described observation window, for example, in order to accurately diagnose deterioration of a gas-insulated device in which CO ₂ gas is sealed as an insulating medium, it is possible to constantly monitor the color change of the discoloration indicator contained therein. As described above, there is disclosed a gas equipment diagnostic system in which an internal observation window is provided on a side portion of a small tank. (For example, see Patent Document 1)
JP 2004-28848 A

  By the way, when the observation window described above is provided, it is necessary to provide a sealed structure in which an opening is provided on a wall surface of a container or the like and a thin glass plate or the like is fitted therein, so that it is difficult to fix the glass plate or the like. Have a problem. In addition, in the case of a configuration in which a cylindrical member is protruded in the container and a glass window is attached to the tip thereof to form an observation window, there is a problem that the number of components increases.

  Furthermore, when an endoscope is attached to the above-described observation window and illumination is performed simultaneously, the illumination light is reflected and enters the observation optical system, which may cause halation and cannot be observed. As a countermeasure against such halation, it is conceivable to provide an observation window and an illumination window separately. However, when two windows are provided, a problem arises in that, in addition to requiring an installation place for providing each window, the positional relationship between the two windows is restricted. Note that when an illumination window is separately installed to prevent halation, the illumination optical system of the endoscope cannot be used, and therefore it is necessary to provide an illumination device separately from the endoscope.

As described above, since the conventional observation window has various problems, it is possible to observe the clear image by preventing the halation, performing appropriate illumination, and easily attaching the endoscope. Tools are desired. Further, in addition to the method for manufacturing an endoscope observation aid for easily manufacturing such an endoscope observation aid, an endoscope observation method using the endoscope observation aid is provided. desired.
The present invention has been made in view of the above circumstances, and the object of the present invention is to manufacture an endoscopic observation aid and an endoscopic observation aid that are easy to attach and prevent halation. It is to provide a method and an endoscope observation method.

In order to solve the above problems, the present invention employs the following means.
An endoscope observation aid according to the present invention is a wall surface opening of an observation object provided for observing the inside using an endoscope in which an observation optical system and an illumination optical system are disposed at a distal end portion. An endoscopic observation aid to be attached to the part,
A first light transmitting member disposed at a position facing the observation optical system, a second light transmitting member disposed at a position facing the illumination optical system, the first light transmitting member, and the second light transmitting member. It is characterized by comprising a light-shielding portion disposed between the light-transmitting members and integrally configured.

  According to such an endoscope observation aid, the first light transmitting member disposed at a position facing the observation optical system and the second light transmitting member disposed at a position facing the illumination optical system. And the light shielding portion disposed between the first light transmitting member and the second light transmitting member, and the observation optical system and the illumination optical system are blocked by the light shielding portion, and the illumination light Does not wrap around the observation optical system. Therefore, it is possible to prevent halation caused by the illumination light entering the observation optical system, and if it is attached by screwing it into the observation opening, it is easy to attach to the endoscope. It becomes a tool.

In the endoscope observation aid described above, the shielding portion may be a plate-like member (light shielding plate) sandwiched between the first light transmitting member and the second light transmitting member, or the first It may be a light-shielding film formed on the joint surface of one of the one light transmissive member and the second light transmissive member.
In the endoscope observation aid described above, it is preferable that a taper is formed on the sandwiching surfaces of the first light transmitting member and the second light transmitting member on which the light shielding portion is disposed. It is only necessary to form a taper having a cross-sectional shape so that one light transmitting member can secure a larger field of view.

In the endoscopic observation aid described above, it is preferable to perform a light diffusion process on the light exit end face of the second light transmission member, and thereby, uniform illumination light without unevenness in brightness and darkness can be irradiated over a wide range. . As a specific example of the light diffusion treatment, for example, the light exit end face may be polished to have a glassy grain (diffusion part). In the endoscope observation aid described above, it is preferable that a light output end surface of one of the first light transmitting member and the second light transmitting member protrudes to form a step.

  In the endoscopic observation aid described above, the light exit end face of the second light transmitting member is preferably formed on an inclined surface that refracts illumination light in the observation direction, whereby the illumination light is directed in the viewing direction. Can be refracted.

  In the endoscope observation aid described above, the first light transmission member may have a truncated cone shape with a small diameter on the observation optical system side, and may be fitted and integrated with a hollow portion formed in the second light transmission member. This is suitable for an endoscope apparatus in which the observation optical system and the illumination optical system are arranged concentrically, such as a rigid mirror.

The method for manufacturing an endoscope observation aid according to the present invention includes an observation object provided for observing the inside using an endoscope in which an observation optical system and an illumination optical system are disposed at a distal end portion. A method of manufacturing an endoscope observation aid to be mounted on the wall opening of
A first light transmitting member disposed at a position facing the observation optical system, a second light transmitting member disposed at a position facing the illumination optical system, the first light transmitting member, and the second light transmitting member. A base material is formed by integrating a light shielding portion disposed between light transmitting members, and the base material is processed into a desired shape.

  According to such a method for manufacturing an endoscope observation aid, the first light transmitting member disposed at a position facing the observation optical system and the second disposed at a position facing the illumination optical system. A base material is formed by integrating a light transmissive member and a light shielding portion disposed between the first light transmissive member and the second light transmissive member, and the base material is processed into a desired shape and manufactured. Therefore, compared to the case of processing into a desired shape and then integrating by bonding or the like, it becomes easier to secure the positional accuracy of each other, and it is easy to manufacture an observation aid for endoscopes that is particularly airtight. Become.

The endoscopic observation method of the present invention is an endoscopic observation method for observing the inside using an endoscope in which an observation optical system and an illumination optical system are arranged at the tip,
A first light transmitting member disposed at a position facing the observation optical system, a second light transmitting member disposed at a position facing the illumination optical system, the first light transmitting member, and the second light transmitting member. An endoscopic observation aid that is integrated with a light shielding portion disposed between light transmitting members is attached to a wall surface opening of an observation target, and the endoscopic observation aid is attached to the endoscopic observation aid. It is characterized by observing while the tip part is brought into contact with a predetermined position.

  According to such an endoscope observation method, the first light transmitting member disposed at a position facing the observation optical system, the second light transmitting member disposed at a position facing the illumination optical system, An endoscopic observation auxiliary tool formed by integrating a light shielding portion disposed between the first light transmitting member and the second light transmitting member is attached to the wall surface opening of the observation target, and the endoscopic observation is performed. Observation is performed while the distal end of the endoscope is brought into contact with the auxiliary tool at a predetermined position, so that the light shielding part blocks the illumination light that travels from the illumination optical system to the observation optical system to prevent halation and ensure that the observation target is appropriate. It is possible to observe a clear image by illuminating.

  According to the present invention described above, since the observation assisting tool for an endoscope having a configuration in which the light transmission member of the observation optical system and the light transmission member of the illumination optical system are blocked by the light shielding portion, the illumination light of the illumination optical system is This makes it possible to prevent halation that occurs around the observation optical system, and therefore provides a remarkable effect of providing an observation aid for an endoscope that can properly observe an observation target and observe a clear image. It is done. The endoscopic observation auxiliary tool having such a configuration is an endoscopic observation auxiliary tool that can be easily attached if it is attached by being screwed into an observation opening.

  A light transmitting member disposed at a position facing the observation optical system; a light transmitting member disposed at a position facing the illumination optical system; and a light shielding portion disposed between the two light transmitting members. By forming a unified base material and processing the base material into a desired shape to produce an endoscope observation aid, the positional accuracy between both transmission members at the time of completion is easily achieved. A remarkable effect is obtained in that an observation aid for endoscope with high airtightness can be secured.

  A light transmitting member disposed at a position facing the observation optical system; a light transmitting member disposed at a position facing the illumination optical system; and a light shielding portion disposed between the two light transmitting members. Observation with an integrated endoscopic observation aid attached to the opening of the wall of the object to be observed, with the end of the endoscope in contact with the endoscopic observation aid in a predetermined position By adopting this method, the light shielding part blocks the illumination light that travels from the illumination optical system to the observation optical system to prevent halation, and the observation object can be properly illuminated so that a clear image can be observed. It is done.

Hereinafter, an embodiment of an endoscope viewing aid according to the present invention will be described with reference to the drawings.
Endoscopic observation aids are used for visually observing internal conditions, such as the state of the inner wall surface and the flow of fluid, from the outside in containers such as tanks and pipes such as pipes. It has the function of an observation window.

  In the first embodiment shown in FIG. 1 to FIG. 5, the observation aid for endoscope (hereinafter referred to as “observation aid”) 10 abuts the distal end 31 of the insertion portion of the endoscope 30 during observation. Used. The observation aid 10 is opposed to the observation light transmission member (first light transmission member) 11 disposed at a position facing the observation optical system 32 of the endoscope 30 and the illumination optical system 33 of the endoscope 30. The illumination light transmitting member (second light transmitting member) 12 disposed at a position where the light is transmitted, and the observation light transmitting member 11 and the light shielding portion 13 disposed between the illumination light transmitting member 12 are integrally configured. Has been.

By the way, as shown in FIG. 8A, the endoscope 30 is inserted with a normal type (hereinafter referred to as “normal type”) in which an observation optical system 32 and an illumination optical system 33 are arranged side by side. As shown in FIG. 8B, for example, a concentric circle type (hereinafter referred to as “rigid”) in which an observation optical system 32 and a ring-shaped illumination optical system 33 are arranged concentrically as shown in FIG. There is an insertion portion tip 31A called “mirror type”.
In the first embodiment described below, the observation aid 10 corresponding to the normal type insertion portion tip 31 will be described.

Now, the observation auxiliary tool 10 of the first embodiment is a cylindrical part integrated by sandwiching the light shielding part 13 between the observation light transmitting member 11 and the illumination light transmitting member 12. And the flange part 14 which prescribes | regulates an insertion limit is provided in the edge part of the insertion direction outer side of the observation assistance tool 10 made into the column shape as shown, for example in FIG. In order to hold the insertion portion distal end 31 of the endoscope 30, the flange portion 14 is provided with a vertical fixing surface 15 in which a circular cylinder is divided into two in the axial direction to form a concave groove portion 15a having a semicircular cross section.
The insertion portion distal end 31 of the endoscope 30 is fitted into the concave groove portion 15a described above. In this state, if the fixing member 16 in which the similar groove 16a is formed is attached by the fixing bolt 17, the insertion portion distal end 31 can be held and held at a predetermined observation position.

  The observation light transmitting member 11 and the illumination light transmitting member 12 of the observation aid 10 described above are parts formed by molding a material that transmits light, such as a transparent resin, into a desired shape. Of these, one observation light transmitting member 11 has a smooth surface by buffing or the like on both end faces (end faces serving as the entrance / exit of the observation light) in the direction in which the observation light passes in order to enable observation with a clear image. Process to become. However, with respect to the illumination light transmitting member 12, the illumination light entrance side (surface on which the endoscope distal end portion 31 abuts) is finished to a smooth surface by performing the same processing as the observation light transmitting member 11 such as buffing. For the exit side end face (light exit end face), for example, it is preferable to apply a light diffusion treatment in which fine irregularities are formed on the surface and polished into a glassy shape (grainy). By forming the diffusing portion 19 that has been subjected to such light diffusing treatment, the unevenness in brightness and darkness caused by the reflection and interference of the illumination light inside the illumination light transmitting member 12 is eliminated, so there is no unevenness in brightness and darkness. Illumination light suitable for illumination can be irradiated over a wide range toward an observation target.

Further, the light shielding portion 13 is made of a light shielding plate-like member that does not transmit light, such as a metal plate or a dark resin plate.
In this case, the sandwiching surfaces of the observation light transmitting member 11 and the illumination light transmitting member 12 in which the light shielding unit 13 is disposed are formed in a wedge shape in which a taper with a relatively small inclination angle is formed. That is, the observation light transmission member 11 can ensure a larger field of view, and the cross-sectional area of the observation light transmission unit 11 gradually increases in the insertion direction from the outside to the inside. Is formed into a tapered surface that gradually decreases in the insertion direction, and the light-shielding portion 13 is sandwiched and integrated between the wedge-shaped transmitting members 11 and 12 so that the observation aid 10 has a cylindrical shape as a whole. It becomes.

  The observation assisting tool 10 configured in this way is formed with an external screw 18 (see FIG. 5) on the outer peripheral surface of a cylinder, for example, for fixing when inserted into the observation position. The outer screw 18 is provided with an appropriate sealing means (seal material, packing, etc.) (not shown) between the inner screw 2a of the through-hole 2 provided through the container wall surface 1 to be observed. It is designed to be screwed together. In this case, the observation auxiliary tool 10 may be always attached to the through hole 2, or normally, a removable sealing member such as a bolt is attached to the through hole 2 and closed, and only during observation. You may make it replace and use for a sealing member.

The observation aid 10 having the above-described configuration is manufactured, for example, as shown in FIG. In FIG. 6, the flange portion 14 and the vertical fixing surface 15 are omitted.
In this manufacturing method, as shown in FIG. 6A, materials for the observation light transmission member 11 ′, the illumination light transmission member 12 ′, and the light shielding portion 13 ′ larger than the final shape are prepared in the first first step. In this case, any material that is larger than the final shape of the observation aid 10 may be used. For example, a rod-shaped observation light transmission member 11 ′ and illumination light transmission member 12 ′ having a substantially semicircular cross section are prepared. The shape is not limited.

In the subsequent second step, a base material 10 ′ as shown in FIG. 6B is obtained by sandwiching and adhering a light shielding portion 13 ′ between the observation light transmitting member 11 ′ and the illumination light transmitting member 12 ′. Form. As a result, the base material 10 ′ has a shape having a larger outer dimension than the observation auxiliary tool 10 described above.
In the final process, the observation aid 10 having a desired size and shape is completed by cutting the base material 10 '. As a result, since the cutting process is performed in the subsequent process, it is possible to easily ensure the accuracy of bonding in the finished product even if the bonding is performed relatively rough without paying special attention to the positional accuracy of each other. it can. The observation assisting tool 10 cut from the base material 10 'in this way does not cause a problem in airtightness due to a level difference caused by a slight positional deviation due to bonding, and is therefore attached to the through hole 2. Good airtightness can be ensured.
Note that the flange portion 14 and the vertical fixing surface 15 that are not shown in the drawing can be easily manufactured by cutting them as a base material 10 ′ having a dimension and shape that includes them.

  By the way, in the manufacturing method described above, the observation assisting tool 10 is manufactured by cutting from the base material 10 ′ larger than the final shape. However, the observation light transmitting member 11 and the illumination light transmitting member 12 processed into the final shape. The light shielding portion 13 may be sandwiched between and adhered. However, securing the dimensional accuracy of bonding is extremely important from the viewpoint of ensuring airtightness, and so ensuring the dimensional accuracy in this step is a difficult operation requiring a large number of work steps.

Hereinafter, an endoscopic observation method using the above-described observation aid 10 will be described together with the operation of the observation aid 10 with reference to FIG.
When observing the inside using the endoscope 30 in which the observation optical system 32 and the illumination optical system 33 are provided at the distal end portion 31 of the endoscope, the observation provided at a position facing the observation optical system 32 The light transmission member 11, the illumination light transmission member 12 disposed at a position facing the illumination optical system 33, and the light shielding portion 13 disposed between the observation light transmission member 11 and the illumination light transmission member 12 are integrated. After attaching the observation aid 10 formed into a through hole (wall surface opening) 2 that is an opening provided in the wall surface 1 to be observed, the distal end portion 31 of the endoscope 30 of the endoscope 30 is attached to the observation aid 10. Is observed while being brought into contact with a predetermined position.

That is, the endoscope 30 aligns the observation optical system 32 of the endoscope distal end portion 31 with the observation light transmitting portion 11 and the illumination optical system 33 of the endoscope distal end portion 31 to the illumination light transmitting portion 12. It is aligned and held in contact with the observation aid 10.
When observation with the endoscope 30 is performed in such a state, as shown in FIG. 1, the illumination light emitted from the endoscope distal end portion 31 passes through the illumination light transmitting member 12 and the diffusion portion 19 in the drawing. It spreads as shown by a broken line, and the observation wall surface (the inner wall surface of the container to be observed) 3 is illuminated over a wide range without uneven brightness.

On the other hand, the field of view of the observation optical system 32 is defined by the exit width of the observation light transmission member 11 separated from the illumination light transmission member 12 by the light shielding part 13 (width on the inner side in the insertion direction), as indicated by a dashed line in the figure. Is done. In this case, since the wedge-shaped observation light transmitting member 11 blocked by the light shielding portion 13 is used, the illumination light is not incident on the observation light transmitting member 11 side to cause halation, and a wide field of view is secured. Yes.
Accordingly, it is possible to observe the observation wall surface 3 that has received good illumination light over a wide range and obtain a clear image. Note that FIG. 2 shows an example of an image obtained by the endoscope 30, and an area without hatching becomes the field of view of the observation optical system 32, and the internal situation such as deposit 4 attached to the observation wall surface 3 and corrosion is clear. It can be confirmed visually from the video.

Next, the configuration of the observation aid 10 and the manufacturing method thereof will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to FIG. 6 mentioned above, and the detailed description is abbreviate | omitted.
The first modification is different in that a light shielding part 13A of a light shielding film is employed instead of the light shielding part 13 of the light shielding plate described above. The light shielding portion 13A is formed by forming a light shielding film that does not transmit light on the joint surface between the observation light transmitting member 11 and the illumination light transmitting member 12. Note that the light shielding film of the light shielding portion 13A may be formed on at least one of the bonding surfaces.

For the light shielding part 13A described above, for example, a light shielding film having a reflective surface formed by vapor deposition of aluminum or the like, a light shielding film formed by applying a light shielding paint or the like, and the two light transmitting members 11, 12 Any of the light-shielding films formed using a light-shielding adhesive may be selected and used when integrating the above.
When the observation aid 10 is manufactured by sandwiching the light shielding portion 13A of such a light shielding film, the observation light transmitting member 11 'and the illumination light transmitting member 12' larger than the final shape are manufactured in the same manner as the manufacturing method described above. A material is prepared, and a light shielding film is formed on one of the joining surfaces to form a light shielding portion 13A ′. Thereafter, a base material larger than the final shape of the observation aid 10 is formed by sandwiching and adhering the light shielding portion 13A ′ between the observation light transmission member 11 ′ and the illumination light transmission member 12 ′. In the same manner, by cutting the base material into a desired shape, the observation aid 10 that functions in the same manner as the light shielding portion 13 of the shielding plate is completed.

Next, a second modification example relating to the configuration of the observation aid 10 described above will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to the description mentioned above, and the detailed description is abbreviate | omitted.
In the second modification, the light exit end face side (the inner face side inserted into the through hole 2) of the observation aid 10 integrated with the light shielding portion 13 sandwiched between the observation light transmissive member 11 and the illumination light transmissive member 12. Is provided with a step or an inclined surface.

In the observation auxiliary tool 10A of the modified example shown in FIG. 9A, the light emission end of the observation light transmitting member 11 is projected to form a step h1. The structure provided with such a step h1 is advantageous when it is desired to ensure a wide observation field of view, and illumination light is less likely to circulate.
The observation assisting tool 10B of the modification shown in FIG. 9B has a configuration in which the light output end of the illumination light transmitting member 12 is projected to form a step h2. When the step h2 is provided, the light exit end on the side of the observation light transmission member 11 that is smoothly finished by buffing or the like when the light exit end of the illumination light transmission member 12 is subjected to the diffusion treatment of the diffusion plate 19 or the like. This makes it difficult for tools and the like to come into contact with each other by mistake, thereby preventing the occurrence of defective products due to scratches or the like.

  In the observation auxiliary tool 10C of the modified example shown in FIG. 9C, the light exit end of the illumination light transmitting member 12 is an inclined surface 12a. The inclined surface 12a is inclined in a direction in which the illumination light is refracted in the observation direction. In the illustrated example, the inclined surface 12a is inclined so that the outer side from the light shielding portion 13 side approaches the flange portion 14 side and becomes shorter. As a result, as indicated by an arrow L in the figure, the illumination light is refracted in the direction of the observation light transmitting member 11, that is, in the observation direction, so that the observation target can be efficiently irradiated with the illumination light. .

Finally, a second embodiment of the observation aid according to the present invention will be described with reference to FIG. The observation auxiliary tool 20 of this embodiment corresponds to the rigid endoscope type insertion portion distal end 31A shown in FIG.
In the observation auxiliary tool 20 of this embodiment, the observation light transmitting member (first light transmitting member) 21 is formed in the illumination light transmitting member (second light transmitting member) 22 with the observation optical system 32 side having a small truncated cone shape. It is set as the structure integrated by fitting in the hollow part 22a.

That is, the observation light transmitting member 21 at a position facing the observation optical system 32 is formed into a truncated cone shape, and the outer end surface of the insertion portion distal end 31A in contact with the observation optical system 32 is reduced in diameter to be expanded toward the inner light exit end surface. This ensures a wide field of view. In addition, a light shielding film serving as the light shielding portion 13 </ b> A is formed on the outer peripheral surface of the observation light transmitting member 21.
When the observation light transmitting member 21 configured in this way is fitted and bonded to the hollow portion 22a of the illumination light transmitting member 22, the central observation light transmitting member 21 faces the observation optical system 32 and around it. The arranged illumination light transmitting member 22 becomes the observation auxiliary tool 20 facing the illumination optical system 33. Further, by providing the light shielding portion 13A, the illumination light does not go around to the observation light transmitting member 21 side and cause halation, which does not hinder a clear image.

  In addition, this invention is not limited to embodiment mentioned above or a modification, It can change suitably in the range which does not deviate from the summary of this invention.

It is a lineblock diagram showing a 1st embodiment about an observation auxiliary tool for endoscopes concerning the present invention. It is a figure which shows the example of an image | video obtained by an endoscope. It is a perspective view which shows the example of an external appearance shape of the observation assistance tool for endoscopes. FIG. 4 is a plan view of FIG. 3. It is sectional drawing which shows the state which attached the observation assistance tool for endoscopes shown in FIG. 3 to the container wall surface. It is a disassembled perspective view of the base material which shows the manufacturing method of the observation assistance tool for endoscopes shown in FIG. 1, (a) is the state before integrating, (b) shows the state of the integrated base material. ing. It is a disassembled perspective view before integration which shows the 1st modification of Fig.6 (a). It is a perspective view of the principal part showing the example of composition of the tip of an insertion part, (a) is a normal type and (b) is a concentric type. It is a block diagram which shows the 2nd modification of the observation assistance tool for endoscopes, (a) is an example which provided the level | step difference by projecting the observation light transmissive member, (b) is the level | step difference by projecting the illumination light transmissive member. (C) has shown the example which used the light emission end of the illumination light transmissive member as the inclined surface. It is a disassembled perspective view which shows 2nd Embodiment about the observation assistance tool for endoscopes which concerns on this invention, (a) is the state before integrating, (b) has shown the integrated state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container wall surface 2 Through-hole 2a Inner screw 3 Observation wall surface (container inner wall surface)
10, 10A-10C, 20 Endoscopic observation aid (observation aid)
11, 21 Observation light transmission member (first light transmission member)
12, 22 Illumination light transmission member (second light transmission member)
12a Inclined surface 13 Shading part (shading plate)
13A Light shielding part (light shielding film)
DESCRIPTION OF SYMBOLS 14 Flange part 15 Vertical fixing surface 15a, 16a Groove part 16 Fixing member 17 Fixing bolt 18 External screw 19 Diffusion part 22a Hollow part 30 Endoscope 31, 31A Insertion part front end 32 Observation optical system 33 Illumination optical system

Claims (10)

An endoscopic observation auxiliary tool attached to a wall surface opening of an observation object provided for observing the inside using an endoscope in which an observation optical system and an illumination optical system are arranged at the tip. There,
A first light transmission member disposed at a position facing the observation optical system;
A second light transmission member disposed at a position facing the illumination optical system;
An endoscopic observation auxiliary tool comprising a light shielding portion disposed between the first light transmitting member and the second light transmitting member and integrally formed. 2. The endoscope observation aid according to claim 1, wherein the light shielding portion is a plate-like member sandwiched between the first light transmitting member and the second light transmitting member. The endoscope observation aid according to claim 1, wherein the light shielding portion is a light shielding film formed on a joint surface of one of the first light transmitting member and the second light transmitting member. Ingredients. The endoscopic observation aid according to claim 1, wherein a taper is formed on a holding surface of the first light transmitting member and the second light transmitting member on which the light shielding portion is disposed. The endoscope observation aid according to any one of claims 1 to 4, wherein a light diffusing process is performed on a light exit end face of the second light transmission member. The endoscope observation according to any one of claims 1 to 4 , wherein a step is formed by projecting a light exit end surface of one of the first light transmitting member and the second light transmitting member. Auxiliary tool. The observation aid for an endoscope according to any one of claims 1 to 5, wherein a light exit end surface of the second light transmission member is formed on an inclined surface that refracts illumination light in an observation direction . 2. The inner portion of claim 1, wherein the first light transmission member has a truncated cone shape with a small diameter on the observation optical system side, and is fitted into a hollow portion formed in the second light transmission member. Endoscopic observation aid. An endoscopic observation auxiliary tool attached to a wall surface opening of an observation object provided for observing the inside using an endoscope in which an observation optical system and an illumination optical system are disposed at the tip. A manufacturing method comprising:
A first light transmitting member disposed at a position facing the observation optical system, a second light transmitting member disposed at a position facing the illumination optical system, the first light transmitting member, and the second light transmitting member. A method for manufacturing an endoscope observation aid, comprising: forming a base material formed by integrating a light shielding portion disposed between light transmitting members; and processing the base material into a desired shape. An endoscope observation method for observing the inside using an endoscope in which an observation optical system and an illumination optical system are disposed at a tip part,
A first light transmitting member disposed at a position facing the observation optical system, a second light transmitting member disposed at a position facing the illumination optical system, the first light transmitting member, and the second light transmitting member. An endoscopic observation aid that is integrated with a light shielding portion disposed between light transmitting members is attached to a wall surface opening of an observation target, and the endoscopic observation aid is attached to the endoscopic observation aid. An endoscope observation method, wherein observation is performed while bringing a tip portion into contact with a predetermined position.

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