JPH11221193A - Air-tight structure of transparent window of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-tight structure of a transparent window of an endoscope whose air-tightness can be held at a high level without damaging a transparent member to be attached to the window and in which a sealing material will never ooze in that part of transparent member exposed to the outside, by interposing a ring-shaped buffer member between the rear surface of the transparent member and a fastening ring, installing the sealing member on the abutting surface of a restriction wall, and forming a seal material staying groove for accommodation of surplus sealing material in a position near the edge on the open side. SOLUTION: A cover glass 21 is installed to a window frame member 19 coupled with a cylindrical body 11, and an elastic sealing member 25 is interposed between the cover glass 21 and the restriction wall part 19c of the window frame member 19, and a buffer member 26 is installed on the rear surface, and a fastening ring 23 is fastened in an abutting condition to the buffer member 26, and this member 26 and the elastic sealing member 25 are deflected. A sealing material 24 is installed between the wall part 19c and the surface of cover glass 21, and a seal material staying part 29 is formed in the wall part 19c for preventing the sealing material 24 from oozing out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, attaching a transparent member such as glass to an illumination window or an observation window of an insertion portion, or an eyepiece window forming an eyepiece portion, to keep the inside airtight. The present invention relates to a transparent window hermetic structure of an endoscope forming a transparent window.

[0002]

2. Description of the Related Art An endoscope is used for observing the inside of a body cavity or the like, and has a structure in which an insertion section for inserting the body cavity or the like is connected to a main body operation unit which is gripped and operated by an operator or the like. It was done. Because the part to be observed by the endoscope is a dark place,
An illumination window and an observation window are provided at the tip of the insertion section. An emission end of a light guide for transmitting illumination light faces the illumination window, and the inside of a body cavity or the like is illuminated via an illumination lens attached to the illumination window. The observation target is observed through the observation window under this illumination, and an objective lens is mounted on the observation window. In the case of an electronic endoscope, a solid-state imaging device is arranged at an image forming position of an objective lens. In an optical endoscope, the incident end of an image guide is made to face the image forming position of the objective lens. Further, an eyepiece is connected to the main body operation unit, and the image guide is extended to the eyepiece. An eyepiece is provided at a portion of the eyepiece that faces the emission end of the image guide, and an eyepiece is formed on an extension of the optical axis of the eyepiece. Can be observed, and a photograph can be taken by attaching a camera.

As described above, an endoscope is provided with transparent windows such as an illumination window, an observation window, and an eyepiece window in an insertion portion and a main body operation portion. In order to protect the internal components of the endoscope from being stained and to prevent the transparent window from fogging or water droplets from adhering to the transparency, the part with the transparent window Airtight structure. Note that lenses such as an illumination lens, an objective lens, and an eyepiece are attached to each of the above-described transparent windows, and therefore, some cover glasses are configured to also serve as lenses.

[0004] For example, the eyepiece section has a tubular main body connected to a main body operation section, and a lens barrel having an eyepiece mounted on the tubular main body is mounted. Some lens barrels are usually movable in the optical axis direction in order to enable diopter adjustment. And at the tip of the cylindrical body,
An opening having a predetermined aperture is provided on an extension of the optical axis in the eyepiece, and a transparent member is provided in this opening as
An eyepiece window is formed by mounting a cover glass made of a circular transparent glass plate.

Here, the endoscope is cleaned each time it is used, and this cleaning is generally performed by immersing the entire endoscope including the eyepiece in a cleaning solution, a disinfecting solution, or the like. Therefore, if the mounting part of the cover glass is not completely airtight,
There is a risk that moisture or mist of the disinfectant may enter the interior. In this case, not only does the inner surface of the cover glass become fogged or a water drop adheres, but a good observation image cannot be obtained, but also the endoscope's built-in components become dirty and rust is generated or deteriorated. Is inconvenient, for example, is shortened. For this reason, it is necessary that the transparent window with the cover glass is completely airtight. The airtight structure of the eyepiece window in this eyepiece is described in, for example,
No. 788 proposes this.

The airtight structure of the eyepiece window according to the prior art is as follows.
The window frame is formed by providing an opening at the end of the cylindrical main body constituting the eyepiece to form an eyepiece window, and this window frame has a regulating wall against which the outer peripheral portion of the cover glass surface abuts. While forming, the inner surface of the cylindrical body is formed into a cylindrical shape,
A screw portion is provided on the inner peripheral surface, and a fastening ring for fixing the cover glass is screwed into the screw portion. Then, by inserting the cover glass into the inside of the cylindrical main body and attaching and tightening the tightening ring to the screw portion in a state where the cover glass is in contact with the control wall, the cover glass is placed between the control wall and the tightening ring. Secure by clamping. In addition, a sealing function is exerted to prevent moisture or disinfectant mist from entering through a gap between the cover glass and the regulating wall.However, as a sealing mechanism, a sealing material and an elastic ring member are used. Used together. The sealing material is provided so as to extend from between the cover glass and the regulating wall to the contact portion between the cover glass and the tightening ring. Further, the elastic ring member is mounted on the regulating wall at a position near the opening at the tip thereof. In order to further enhance the sealing effect of these two types of sealing mechanisms, a strong tightening force is applied to the tightening ring so that the cover glass is pressed against the regulating wall.

[0007]

As described above, when the cover glass is pressed against the regulating wall, the sealing function of the two different types of sealing mechanisms, ie, the elastic ring member and the sealing material, can be maximized. Although there is an advantage that the inside of the eyepiece can be maintained in an extremely high airtight state, the airtight structure of the transparent window according to the conventional technique is not without its problems.

First, the tightening ring is formed of a rigid member such as a metal because a thread portion is provided on an outer peripheral surface thereof. And since this tightening ring comes into direct contact with the cover glass, if a strong tightening force is applied to the tightening ring to increase the airtightness, there is a possibility that the contact portion of the cover glass with the tightening ring may be damaged. is there. In addition, since the sealing material interposed between the cover glass and the regulating wall is a fluid, if the sealing material is excessively applied, when the cover glass is pressed against the regulating wall by the tightening ring, an excess seal is applied. The material oozes into the inside of the cover glass, and there is a possibility that the portion having an effective diameter of the cover glass may be stained. Therefore, after the cover glass is assembled, the exuded seal material must be wiped off, and since a step is formed in the portion of the regulating wall, this work is troublesome, and the seal material is completely removed. If you can not wipe it, it will not hinder observation,
There is a problem that the appearance becomes unsightly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and has an extremely stable state without damaging a transparent member mounted on a transparent window, and has an airtightness. It is an object of the present invention to maintain the sealing member in an extremely high state, and to prevent a sealing material provided between the transparent member and the regulating wall from oozing into a portion exposed to the outside of the transparent member.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a method for forming a transparent window in an endoscope so as to project inward on an inner peripheral surface provided with a screw portion. A window frame portion having a predetermined opening diameter is formed by connecting a regulating wall having a predetermined width, and a transparent member is fitted into the window frame portion such that the outer peripheral surface thereof comes into contact with the regulating wall. A transparent member is clamped between the tightening ring and the regulating wall by screwing a tightening ring into the screw portion, wherein the transparent member has a back surface and the tightening ring. A sealing material is provided at least on the contact surface side of the regulating wall, and a surplus sealing material is accommodated at a position near an edge of the regulating wall on the opening side. The structure to form the material storage groove The is for its features.

Here, when the cushioning member has a function of only protecting the transparent member, it may be provided only on the contact surface with the tightening ring, but the cushioning member also exerts a sealing function. The sealing member has a large sealing area by forming a buffer member with a ring member having an L-shaped cross section in which a portion contacting the rear surface side of the transparent member and a portion contacting the outer peripheral surface are integrally connected. Can be secured. Further, when an annular ridge is formed on the back side of the cushioning member, the amount of bending of the cushioning member increases, and the sealing function is further improved. The tightening ring is required to have a cylindrical portion formed with a screw on the outer peripheral surface because of the relation of being screwed into a screw portion formed on the inner peripheral surface of the window frame portion. An annular portion that is larger than the diameter of the opening that constitutes the transparent window and that extends inward from the inner peripheral end of the buffer member is continuously provided so as to extend inward, and this annular portion is used as the buffer member. It may be configured to be pressed. Further, in addition to the sealing material, a ring-shaped elastic sealing member can be attached to the abutting portion of the regulating wall with the transparent member, whereby the area for exerting the sealing function becomes extremely large. The sealing function provided by the various types of sealing mechanisms is fully demonstrated. As a transparent member, an observation window of an endoscope,
A cover glass or the like to be attached to the illumination window or the eyepiece opening of the eyepiece can be used.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. Here, in the following embodiment, a fixing structure of a cover glass as a transparent member is shown in an eyepiece window formed in an eyepiece part, but other than this, an illumination window or an observation window provided at a tip of an insertion part. Needless to say, the present invention can also be applied to a fixing structure of a cover glass or a cover glass also serving as a lens. In the drawings, FIG. 1 is a cross-sectional view of the entire eyepiece of the endoscope, and FIG. 2 is an enlarged cross-sectional view of a mounting portion of a cover glass. FIG. 3 is a sectional end view of the cushioning member in a free state.

In FIG. 1, reference numeral 1 denotes a main body operation unit, and an eyepiece unit 10 is connected to the main body operation unit 1. A connecting cylinder 2 is protruded from the main body operation unit 1 side, and an image guide holder 4 having an image guide 3 inserted therein is inserted and fixed inside the connecting cylinder 2. A cylindrical main body 11 of an eyepiece 10 is fitted and fixed to the connecting cylinder 2. A lens barrel 13 to which an eyepiece 12 is attached is provided slidably along the inner surface of the cylindrical main body 11.

The movable lens barrel 13 is used to adjust the diopter by displacing the eyepiece 12 along the optical axis in a direction to move toward or away from the end face of the image guide 3. is there. For this purpose, the lens barrel 1
3 is provided with a cam pin 14 projecting therefrom.
Reference numeral 4 penetrates a long groove 15 provided in the cylindrical main body 11 and is inserted into a cam groove 17 in a cam ring 16 rotatably provided in the cylindrical main body 11. And this cam ring 16
When the operation ring 18 is rotated by a finger, the cam ring 16 rotates following the operation ring 18 and slides the lens barrel 13 along the inner surface of the cylindrical main body 11. Will be displaced.

An annular window frame member 19 is connected to the distal end of the cylindrical main body 11. Window frame member 19
Constitutes the eyepiece window 20, and the window frame member 1
A cover glass 21 is attached to 9. Here, if an opening having a predetermined diameter is formed at the tip of the cylindrical main body 11,
Although a configuration in which a window frame portion is provided integrally with the cylindrical main body 11 can be adopted, the configuration in which the window frame member 19 is connected to the cylindrical main body 11 allows the cover glass 21 to be attached to the eyepiece window 20. This is advantageous in that the mounting of the device can be easily performed. The window frame member 19 can be attached to and detached from the cylindrical main body 11 using bolts 22 and is fixedly held in the mounted state.

As described above, the window frame member 19 to which the cover glass 21 is attached needs to be sealed while the window frame member 19 is fixedly connected to the tubular main body 11. First, the joint between the cylindrical main body 11 and the window frame member 19 must be kept airtight. In the eyepiece 10, as shown, the tubular main body 11 and the window frame 1
Since a large contact area is secured on the joint surface between the sealing member 9 and the sealing member 9, the sealing function can be sufficiently exerted by mounting a sealing material, an elastic sealing member, or the like. In the case of the eyepiece 10, this is good, but in order to be inserted into the body cavity, in the case of the illumination window or observation window provided at the distal end of the insertion portion that needs to be reduced in diameter, a window frame member is required. When connected, the joint area of the connecting portion becomes extremely small, and it may not be possible to exert a sufficient sealing function. Therefore, as for the illumination angle and the observation window, it is preferable that the window frame is provided integrally with a portion corresponding to the cylindrical main body.

The window frame member 19 has a glass holding portion 19a on which the cover glass 21 is fixedly held. On the inner peripheral wall on the base end side of the glass holding portion 19a, that is, on the connecting side to the cylindrical main body 11, A female screw is formed, and this portion is a screw insertion portion 19b. The screw insertion portion 19b is the glass holding portion 1
An inward annular projection extending over a predetermined width is continuously provided at a portion on the opposite side with respect to 9a, and this portion serves as a regulating wall portion 19c. Here, the regulating wall portion 19c does not obstruct the field of view from the eyepiece lens 12, and the inner diameter thereof forms the effective diameter of the eyepiece portion 10.

Reference numeral 23 denotes a tightening ring. The tightening ring 23 has a cylindrical portion 23a, and an annular portion 23b is continuously provided at the tip of the cylindrical portion 23a so as to protrude in the inner circumferential direction. ing. Here, a male screw is formed on the outer peripheral surface of the cylindrical portion 23a.
9 is screwed into the screw insertion portion 19b. When the tightening ring 23 is screwed into the window frame member 19, the inner peripheral end of the annular portion 23 b has such a size that it does not protrude inward from the regulating wall portion 19 c of the window frame member 19.
The fastening ring 23 is for holding the cover glass 21 between the annular portion 23 b and the regulating wall portion 19 c of the window frame member 19 in a fixed manner.

The cover glass 21 is fixedly held in the eyepiece window 20 of the window frame member 19 by the fastening ring 23. The configuration of the eyepiece 10 is preferably as small and compact as possible. For this purpose, the size of the portion of the window frame member 19 projecting inward from the regulating wall portion 19c is minimized. In this manner, the dimension of the restricting wall portion 19c and the tightening ring 23 extending to the inside of the annular portion 23b is minimized, the cover glass 21 is stably held, and the inside of the eyepiece 10 is removed. A seal mechanism is interposed between the seal mechanisms to keep the airtight. This seal mechanism is configured as follows.

That is, as is apparent from FIG. 2, as a member for exerting a sealing function on the mounting portion of the cover glass 21, a sealing material 24 and an elastic sealing member 25 are used.
Further, a buffer member 26 is also used. Here, the elastic seal member 25 is formed of, for example, an O-ring, and
When the cover glass 21 is mounted, the cover glass 21 is brought into contact with the surface thereof and is bent by a predetermined amount, so that the space therebetween is kept airtight. Will be.

The cushioning member 26 is interposed between the cover glass 21 and the tightening ring 23 to cover the cover glass 2.
1 for protecting the cover glass 2, and furthermore, the cushioning member 26 has a
1 comes into contact with the rear surface side from the outer peripheral surface. Accordingly, the cushioning member 26 has a cylindrical portion 26a having a predetermined thickness.
And an annular member 26b formed of an elastic member having a substantially L-shaped cross section. The cylindrical portion 26a has a length that fits into a portion having a width approximately half of the outer peripheral surface of the cover glass 21. A step 28 is formed in the glass holding portion 19a of the window frame member 19 so that the glass holding portion 19a of the window frame member 19 can be mounted on the glass holding portion 19a with the buffer member 26 fitted to the cover glass 21 in this manner. The step 28 is the regulation wall 19
c is formed at a position about half the thickness of the cover glass 21 from the portion connected to the cover glass 21. The inner diameter of the portion on the regulation wall portion 19c side from the step 28 substantially matches the outer diameter of the cover glass 21. The inner diameter of the portion on the screw insertion portion 19b side is slightly larger than the outer diameter of the cylindrical portion 26a of the buffer member 26. The width of the annular portion 26 b is smaller than the width of the annular portion 23 b of the tightening ring 23. Further, as is apparent from FIG.
The annular portion 26b of the cushioning member 26 has a cylindrical portion 26a
An annular ridge 26c protruding in the direction opposite to the direction in which the cylindrical portion 26a extends is formed in the vicinity of the continuous portion.

The sealing material 24 is made of a viscous fluid, and the portion shown by hatching in FIG.
Is applied to almost the entire contact surface of the window frame member 19 with the regulating wall portion 19c, to the outer peripheral surface, and further to the rear surface side to cover almost the entire annular portion 23b of the tightening ring 23. When the cover glass 21 is pressed against the regulation wall 19c of the window frame member 19, the regulation wall 19
In order to prevent the cover glass 21 from seeping out from the front end of the cover glass 21 to the site where the cover glass 21 is exposed, the regulating wall portion 19c contains an excess sealing material so as not to seep out any more. An annular seal material reservoir 29 is formed at a position on the end side of the seal mounting groove 27. A sealing material reservoir 30 is also formed on the side of the annular portion 23b of the fastening ring 23 for the same reason. However, since the sealing material reservoir 30 cannot be formed in an annular shape on the tightening ring 23 side, it is formed by a plurality of through holes arranged in the circumferential direction.

The present embodiment is constructed as described above. When assembling the eyepiece 10 to the main body operation unit 1, first, a seal mounting groove formed on the inner surface side of the regulating wall 19c. The elastic seal member 25 is fitted into the cover 27. In this state, the sealing material 24 is applied to the regulating wall portion 19c, and preferably from this portion to the portion of the glass holding portion 19a. Here, the sealant 24 is not applied to the inner peripheral end on the regulation wall portion 19c side, but is applied to the sealant reservoir 29.
Is applied only to the outer peripheral side from the position, and does not protrude from the sealing material reservoir 29. Next, with the sealing member 24 applied to the contact surface of the cushioning member 26 with the cover glass 21, the cylindrical portion 26 a is fitted to the outer peripheral surface of the cover glass 21, and the annular portion 26 b is attached to the cover glass 21. To be in contact with the back side of
In this state, the cover glass 21 is inserted into the glass holding portion 19a of the window frame member 19.

The outer diameter of the cover glass 21 is
9a is fitted in a small-diameter portion formed in the step 28 in a substantially close fit state. Thereby, the cover glass 21
The movement of the eyepiece 12 in the direction orthogonal to the optical axis is restricted. The buffer member 26 is fitted to the cover glass 21, but the step 2 of the glass holding portion 19b is not provided.
The large-diameter portion formed by 8 is larger than the outer diameter of the cylindrical portion 26a of the buffer member 26. Therefore, the buffer member 26 is also easily fitted to the glass holding portion 19a. However, in this state, the cushioning member 2
A small gap is formed between the outer peripheral surface of No. 6 and the glass holding portion 19a.

After attaching the cover glass 21 to the glass holding portion 19 a of the window frame member 19, the fastening ring 23 is screwed into the window frame member 19. The fastening ring 23 is screwed to the screw insertion portion 19b with the annular portion 23a facing the cover glass 21 side. As the tightening ring 23 is screwed in, the ridges 2 provided on the annular portion 26 b of the cushioning member 26
6c. When further tightening is performed from this position, first, the ridge 26c is elastically deformed, and the buffer member 26
The gap between the outer peripheral surface of the glass holder 19a and the glass holding portion 19a is filled. When the tightening force is still applied to the tightening ring 23 from this position, the buffer member 26 is pressed against the cover glass 21 that is in contact with the regulating wall 19c, and the annular portion 26b of the buffer member 26 is compressed. Will be. However, a tightening ring 2 made of a rigid member
Since 3 does not directly contact the cover glass 21, even if the fastening ring 23 is strongly tightened, there is no possibility that the cover glass 21 is damaged.

By tightening the tightening ring 23 until the protrusion 26c of the cushioning member 26 is compressed and deformed and the whole annular portion 26b is compressed, the front side of the cover glass is brought into contact with the regulating wall 19c of the window frame member 19. And the front side of the cover glass 21 presses the elastic seal member 25 mounted in the seal mounting groove 27 of the regulating wall portion 19c, and the elastic seal member 25 is bent. As a result, the cover glass 21 is fixed in a stable state, and the elastic sealing members 25 and 26 are compressed and deformed, so that the sealing function between them is exhibited. In particular, since the elastic seal member 25 is mounted at a position close to the outside, the elastic seal member 25 is bent so that the sealing function is maximized.

Since the sealing material 24 is applied to the outside of the effective diameter of the cover glass 21, the sealing material 24 is pressed by the tightening of the tightening ring 23 between the cover glass 21 and the regulating wall 19 c. Is pressurized and spreads over the entire surface of the contact surface therebetween, bubbles and the like that impair airtightness are eliminated, and a uniform layer is formed. Improvement is achieved. However, when a pressing force acts on the sealing material 24, the surplus tends to flow inside along the front and back surfaces of the cover glass 21. Although the elastic seal member 25 is provided, since a high pressure acts on the seal member 24, there is a possibility that the elastic material will ooze out of the elastic seal member 25. However, even if the sealing material 24 oozes out of the elastic sealing member 25, the regulating wall portion 19c
Is formed with a sealing material reservoir 29, the sealing material 24 that has entered the sealing material reservoir 29 is in a state where no pressing force is applied. No more oozes along the surface of the glass 21. Similarly, on the back surface side of the cover glass 21, the surplus sealing material 24 can be retained in the sealing material reservoir 30 provided in the annular portion 23 b of the tightening ring 23.

Therefore, these seal material storage portions 29, 30
Is the limit position where the sealing material 24 oozes out, and the sealing material 24 extends to the exposed portion constituting the effective diameter of the cover glass 21.
There is no danger of seeping and soiling. In order to more reliably prevent the seepage of the sealing material 24, the height of the inner surface of the regulating wall portion 19 c from the portion of the sealing material reservoir 29 is covered by the cover from the outer peripheral portion including the seal mounting groove 27. It is preferable to provide a step so as to be slightly close to the glass 21. On the other hand, since the sealing material reservoir 30 side is the inside of the eyepiece 10, the sealing material 24 does not require a large amount, so that the sealing material should not be applied inside from the portion where the buffer member 26 is in contact. In this case, the sealing material reservoir 30 may not be provided.

As described above, the sealing material 24 is surely applied over a wide range from the position of the sealing material reservoir 29 to the position of the sealing material reservoir 30 without soiling the portion where the cover glass 21 is exposed. Since the sealing member 24 can be spread, a sealing surface covering a large area is formed, and since the bubbles or the like are not present at all by strongly pressing the sealing material 24, an extremely high sealing function is exhibited. Therefore, a high degree of airtightness can be achieved by a simple operation of strongly tightening the tightening ring 23, and the necessity of troublesome work such as wiping off the exuded sealant can be eliminated.

After using the endoscope, cleaning and disinfection are required. In order to simplify this work, it is common to immerse the entire endoscope in a cleaning solution, a disinfecting solution, or the like. Therefore, if the sealing material 24 comes into direct contact with the cleaning liquid or the disinfecting liquid during the cleaning and disinfection, the sealing material 24 is deteriorated or deteriorated. However, the elastic sealing member 25 having high chemical resistance is provided, and the sealing material 24 is provided. Since there is substantially no possibility of being directly exposed to a disinfecting solution or the like, the deterioration and deterioration of the sealing material 24 can be suppressed to a minimum, and the life of the sealing material 24 can be extended.

The endoscope may be sterilized by heating.
Window frame member 19, cover glass 21, tightening ring 23
Since the buffer member 26 and the buffer member 26 each have a specific coefficient of thermal expansion, when heating is performed, a gap may be formed between the window frame member 19 and the cover glass 21 due to a difference in the coefficient of thermal expansion between them. However, since the buffer member 26 is in a state of being pre-pressed by the tightening of the tightening ring 23, a state in which a pressing force is always applied between the regulating wall 19 c of the window frame member 19 and the cover glass 21. , And there is no possibility that the sealing material 24 peels off.

As described above, the function of the cushioning member 26 is the function of the cover glass 21 as a protection member for preventing the fastening ring 23 from directly abutting on the cover glass 21 and the function of the elastically bent state. As a result, a function of sealing the relevant portion is also exerted, and the cover glass 21 is elastically held instead of exerting a rigid holding force. When performing the above-mentioned operations, a function of absorbing a difference in thermal expansion is also exhibited.
As a result, the portion of the eyepiece window 20 to which the cover glass 21 is attached can have an extremely high airtight structure, and the airtightness can be stably maintained for a long period of time.

[0033]

As described above, according to the present invention, an annular buffer member is interposed between the back surface of the transparent member and the tightening ring, and the sealing material is provided on the contact surface side of the regulating wall. At the same time, since a sealing material storage groove for accommodating excess sealing material is formed at a position near the edge on the opening side of the regulating wall, the transparent member attached to the transparent window is extremely stable without being damaged. In addition, the airtightness can be kept extremely high, and the sealing member provided between the transparent member and the regulating wall does not seep out to the portion exposed to the outside of the transparent member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a state in which an eyepiece device according to an embodiment of the present invention is mounted on a main body operation unit of an endoscope.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is an end view of a cut portion of the cushioning member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main-body operation part 10 Eyepiece apparatus 11 Cylindrical main body 19 Window frame member 19a Glass holding part 19b
Screw insertion part 19c Control wall part 20 Eyepiece window 21 Cover glass 23 Fastening ring 23a Cylindrical part 23b
Annular part 24 Sealing material 25 Elastic sealing member 26 Buffer member 26a
Tubular part 26b Annular part 26c
Ridge 27 Seal mounting groove 28 Step 29, 30 Seal reservoir

Claims (6)

[Claims] 1. To form a transparent window in an endoscope, the endoscope has a predetermined opening diameter by continuously connecting a regulating wall having a predetermined width so as to project inward from an inner peripheral surface provided with a screw portion. By forming a window frame portion, a transparent member is fitted into the window frame portion so that the outer peripheral surface thereof comes into contact with the regulating wall, and a tightening ring is screwed into the screw portion, whereby the tightening ring is formed. And a restricting wall sandwiched between the transparent member and the tightening ring. A seal material is provided on a contact surface side of the endoscope, and a seal material storage groove for accommodating an excess seal material is formed at a position near an edge on an opening side of the regulating wall. Window airtight structure. 2. The cushioning member is constituted by a ring member having an L-shaped cross section in which a portion contacting the rear surface side and a portion contacting the outer peripheral surface are integrally connected to the transparent member. The transparent window hermetic structure of an endoscope according to claim 1, wherein: 3. The transparent window of an endoscope according to claim 2, wherein the buffer member has a configuration in which an annular ridge is formed at a portion that comes into contact with the back surface side of the transparent member. Airtight structure. 4. The tightening ring is connected to a cylindrical portion formed with a screw inserted into the screw portion on an outer peripheral surface, and is connected to a distal end of the cylindrical portion so as to project inward, and an opening diameter of the window frame portion. An annular portion that is larger than the inner peripheral end of the cushioning member, and the sealing material extends from the front surface side of the transparent member to the annular portion of the fastening ring on the back surface side. The transparent window hermetic structure of an endoscope according to claim 1, wherein a plurality of seal material storage holes are formed in the annular portion. 5. The airtight structure for a transparent window of an endoscope according to claim 1, wherein a ring-shaped elastic seal member is mounted on said regulating wall. 6. The endoscope according to claim 1, wherein the transparent member is a cover glass attached to one of an observation window, an illumination window, and an eyepiece opening of an eyepiece of an endoscope. Transparent mirror airtight structure.