JPH04170929A - Endoscope - Google Patents

Abstract

PURPOSE:To prevent a cloud of the inside surface of an objective lens by inserting an inserting part of an endoscope into a celom, and injecting cold washing water to the outside surface of the objective lens exposed to body fluids and filth, etc., from a washing nozzle through a water supply duct line. CONSTITUTION:When an inserting part 13 of an endoscope 12 is inserted into a celom, when cold washing water is injected to the outside surface of a first objective lens exposed to body fluids or filth from a washing nozzle 5 through a water supply line 10, a first objective lens 1 warmed by the body heat is cooled, and a lens frame 8 for supporting this objective lens 1 is also cooled directly by the washing water. Accordingly, a temperature difference is scarcely generated between a first objective lens 1 and the lens frame 8. Also, it does not occur that only a first objective lens 1 is cooled suddenly in a space 5 of the inside surface side of a first objective lens 1. In such a way, even, if vapor intrudes into the space 3 between the objective lenses 1, 2, its vapor does not become dew concentrically on the inside surface of a first objective lens 1, therefore, the inside surface of a first objective lens 1 does not become blurred, and a distinct visual field is always secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscope capable of preventing fogging of the inner surface of an objective lens.

[Prior Art] Conventionally, in the structural design of the distal end of a medical endoscope, which is frequently exposed to the high humidity atmosphere inside the body, it has been necessary to prevent the objective optical system components within the distal end from fogging up or corroding. It is an absolute requirement that the building be kept watertight. In addition, the endoscope is cleaned and disinfected for each case to prevent infection, but since the endoscope is immersed in a cleaning and disinfecting solution at this time, the watertight structure of the objective optical system is A fairly high level is required.

By the way, when an endoscope is inserted into the body, the outer surface of the objective lens located at the tip of the endoscope is exposed to body fluids, dirt, etc., and becomes dirty, which obstructs visual field observation. Therefore, a water supply mechanism is used to constantly send cleaning water to a cleaning nozzle at the tip of the endoscope, and the nozzle sprays the cleaning water against the outer surface of the objective lens to clean it and ensure a clear field of view. I try to do that.

[Problems to be Solved by the Invention] However, even if the endoscope tip structure is made watertight by using, for example, an adhesive with low hygroscopicity, water resistance, and chemical resistance, the adhesive area will be reduced. There is a restriction unique to endoscopes that they cannot be made large, and during cleaning and disinfection, the tip of the endoscope may hit a cleaning tank or the like and receive a shock. As described above, due to problems in watertightness, as the number of times the endoscope is used increases, water vapor intrudes into the distal end of the endoscope, and the amount of vapor increases. Particularly, there is a problem in that steam enters the sealed space on the inner surface side of the objective lens formed by the objective lens and the lens frame. In these cases,
When the outer surface of the objective lens is washed with cleaning water, the objective lens, which has been warmed by body temperature, is rapidly cooled down by the cleaning water, but the lens frame that supports this objective lens is located inside the end of the endoscope and is not exposed to the outside. I get cold because I don't have it.
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Therefore, a temperature difference will occur between the objective lens and the lens frame. Moreover, only the objective lens is suddenly cooled in the atmosphere on the inner surface side of the objective lens formed by the objective lens and the lens frame. by this,
Steam in the sealed space on the inner surface of the objective lens sometimes condenses on the inner surface of the objective lens, clouding the inner surface of the objective lens and hindering observation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope that can prevent the inner surface of the objective lens from becoming cloudy.

[Means for Solving the Problems] In order to achieve the above problems, the present invention was constructed as follows. That is, the objective lens is fixed through the lens frame within the distal end component, and cleaning water guided to the endoscope distal end via the water supply pipe is injected toward the objective lens near the objective lens. 5. In an endoscope provided with a cleaning nozzle, at least a part of the lens frame is provided substantially exposed within a spraying range of cleaning water from the nozzle or within the water supply pipe.

[Operation] With the above configuration, when the outer surface of the objective lens is cleaned with the cleaning water, the objective lens is cooled, but the lens frame that supports this objective lens is also directly cooled by the cleaning water.

Therefore, almost no temperature difference occurs between the objective lens and the lens frame, or the lens frame cools down more rapidly.

That is, in the atmosphere on the inner surface side of the objective lens formed by the objective lens and the lens frame, only the objective lens is not suddenly cooled down. Therefore, even if steam enters the sealed space on the inner surface of the objective lens, the vapor will not condense on the inner surface of the objective lens, clouding the inner surface of the objective lens, and hindering observation.

[Example] Hereinafter, each example of the present invention will be described with reference to the accompanying drawings.

1 to 3 show a first embodiment of the present invention. As shown in FIG. 2, the medical endoscope 12 includes an endoscope main body including an operating section 14 and an insertion section 13 inserted into a patient's body cavity.

The operation section 14 is provided with an eyepiece section 19, a bending operation knob 20, an insertion port 18 for an affected area treatment tool such as forceps, an air/water supply button 16, a suction button 17, and the like. 14 is connected to a light guide cord 21 that is connected to a light source device 78 for illumination (see FIG. 18).

Further, the distal end side of the insertion section 13 is a bendable curved section 15, and furthermore, the distal end of the curved section 15 is provided with a distal end component 7 incorporating an objective optical system for imaging. As the bending portion 15 is bent by rotating the bending operation knob 2o, the distal end portion 7 is curved in an arbitrary direction so as to be able to face a desired location within the body cavity.

By the way, the inside of the curved part 15 and the inside of the tip structure part 7 are constructed as shown in FIG. 3. That is, the curved portion 15
The curved pieces 25 are arranged inside a rubber-like outer skin 27 in the longitudinal axis direction of the insertion portion 13. The curved pieces 25 are rotatably connected at their adjacent ends by rivets 26, so that they can be bent freely.

Further, a light guide 28 connected to the light source device 78 via the light guide cord 21 is attached to the tip component 7 located on the tip side of the curved portion by a light guide base 29. Illumination light from the light source device 78 is irradiated into the body through the lens 31.

Further, the distal end component 7 is provided with objective optical system members such as, for example, a first objective lens 1, a second objective lens 2, and a lens frame 8. These objective optical system members, the light guide cap 29, etc. are fixed by a fixing member 6.

As shown in detail in FIG. 1, the first objective lens 1 and the second objective lens 2 are fixed by a cylindrical lens frame 8. Further, the tip end surface of the lens frame 8 is exposed to the outside so that it can receive a cleaning water jet from a cleaning nozzle 5, which will be described later, and a thin insulating coating 11 is coated on the exposed tip surface. It has been subjected.

Further, the space 3 between the objective lenses 1 and 2 is a closed space sealed from the outside by the inner surface of the first objective lens 1, the outer surface of the second objective lens 2, and the inner surface of the lens frame 8. There is.

Although not shown in detail, for example, another objective lens is arranged on the base end side of the second objective lens.

Note that in the case of an electronic endoscope, a solid-state imaging device such as a CCD is provided. The object light of the object irradiated by the illumination light guided into the body via the light guide 28 is transmitted to the operating unit 14 via the other objective lens, an image pickup device such as a CCD, etc., and the image guide 4. By transmitting the information to the eyepiece 19 of the body, the inside of the body can be observed through the eyepiece 19.

Furthermore, a fixing member 6 is provided on the outside of the lens frame 8 to fix the lens frame 8 and its peripheral members. A protective cover 9 is provided at the distal end of the distal end forming portion 7 to protect the distal end portion.

Furthermore, a cleaning nozzle 5 is provided to protrude from the tip of the tip component 7, and is configured to spray the cleaning water sent to the tip of the endoscope onto the outer surface of the first objective lens 1 to clean it. It has become.

Therefore, the endoscope 1 having the distal end component 7 configured as described above
When the insertion portion 13 of the second objective lens 1 is inserted into the body cavity, cold cleaning water is sprayed from the cleaning nozzle 5 through the water supply channel 10 onto the outer surface of the first objective lens 1 exposed to body fluids or filth. The first objective lens 1 that has been warmed by body temperature is cooled down, but the lens frame 8 that supports this objective lens 1 is also directly cooled.
It will be cooled by the washing water.

Therefore, almost no temperature difference occurs between the first objective lens 1 and the lens frame 8. Moreover, only the first objective lens 1 is a first objective lens formed by the first objective lens 1 and the lens frame 8, etc.
The space 3 on the inner surface side of the objective lens 1 is not suddenly cooled down. By this, even if the objective lens 1,
Even if steam enters the space 3 between the two, the steam does not condense condensation on the inner surface of the first objective lens 1, so the inner surface of the first objective lens 1 does not become cloudy and the field of view is always clear. can be ensured.

In this embodiment, the lens frame 8 is used as the objective lens 1,
It is more effective to use a material having a higher thermal conductivity than the thermal conductivity of 2, for example, aluminum, gold, silver, copper alloy, duralumin, or the like. As a result, the lens frame 8 is cooled before the objective lens 1.2, so that the steam that has entered the space 3 can be actively condensed on the inner surface of the lens frame 8.

Therefore, the vapor does not condense on the inner surface of the objective lens 1.2, so that the objective lenses 1, 2 are not fogged and a clear field of view can be ensured.

On the other hand, even if the thermal conductivity of the lens frame 8 and the objective lens 1.2 are similar, the inner surface of the lens frame 8 may be made rougher than the inner surface of the objective lens 1.2, which is normally smooth and flat. By making it easier for the vapor to condense on the inner surface of the lens frame 8,
The same effects as above can be expected.

Furthermore, by coating the first objective lens 1 to make it less likely to cool down, or by expanding the radiation range of the cleaning water emitted by the cleaning nozzle 5, the lens frame 8 can be made to be closer to the objective lens 1°2. This is effective because it can be cooled quickly.

Furthermore, among the peripheral members disposed near the objective lens 1.2, the lens barrel and the like are made of aluminum or the like, and in addition, the fixing member 6, the protective cover 9, etc.
It is also effective to use a material having a higher thermal conductivity than that of .

FIG. 4 shows a second embodiment of the invention. In the following embodiments, parts common to those in FIGS. 1 to 3 are denoted by the same reference numerals, and the explanation thereof will be omitted.

The objective optical system structure of the three distal end components of the endoscope in this embodiment has a first objective lens 1 and a second objective lens 2, which are fixed to a lens frame 8 with a resin adhesive. It is maintained by

A cooling cavity 36 is provided on the outer periphery of the lens frame 8 so that the cleaning water sent by the water supply tube 35 can flow along the outer periphery of the lens frame 8 to cool the lens frame 8. As a result, the cleaning water sent from the water supply tube 35 passes through the water supply hole 38 provided in the fixing member 6 and flows inside the cooling cavity 36 provided on the outer periphery of the lens frame 8 along the outer periphery of the lens frame 8. The water flows through the nozzle 5 provided on the opposite side from the water supply hole 38 and is sprayed onto the outer surface of the first objective lens 1 .

Therefore, when the insertion section 13 of the endoscope 12 having the three distal end components configured as described above is inserted into a body cavity, cold washing water is supplied from the washing nozzle 5 through the water supply tube 35 and the water supply hole 38 to the body fluid or the body cavity. When sprayed onto the outer surface of the first objective lens 1 exposed to dirt, the first objective lens 1 heated by body temperature
The objective lens 1 is cooled, but before that, the lens frame 8 is cooled all at once to the inner surface facing the closed space 3 by the cleaning water flowing in the cooling cavity 36. That is, the cleaning water circulates around the lens frame 8 and is then sprayed onto the outer surface of the first objective lens 1. Therefore, the lens frame 8 is surely cooled down faster than the objective lenses 1 and 2, and the temperature of the cleaning water itself has increased due to the heat absorbed from the lens frame 8, so the cold cleaning water is directly cooled down to the objective lens 1. No need to inject at 1.

Therefore, only the first objective lens 1 is not cooled compared to the lens frame 8 and the like. Of course, the space 3 on the inner surface side of the first objective lens 1 is not suddenly cooled down. As a result, even if the space between the objective lenses 1 and 2
Even if steam enters the lens frame 8, the steam may condense on the inner surface of the lens frame 8, but it will not condense on the inner surface of the first objective lens 1. The inner surface of the lens 1 is not fogged, and a clear field of vision can always be ensured.

Note that providing the cooling cavity 36 at the distal end of the endoscope will make it difficult to drain water from the cleaning nozzle 5, but a fine mesh on the joint surface between the cooling cavity 36 and the cleaning nozzle 5 By inserting the cooling cavity 36, surface tension is generated, and the remaining cleaning water in the cooling cavity 36 can be prevented from flowing out.

Note that in this embodiment as well, the lens frame 8 is connected to the objective lens 1.
, 2, such as aluminum, gold, silver, copper alloy, duralumin, etc., is more effective. This allows the first objective lens 1 and the second objective lens to
The objective lens 2 itself has a lower thermal conductivity than the lens frame 8, and is fixed to the lens frame 8 with a resin adhesive, which further reduces the thermal conductivity due to the adhesive layer. Therefore, steam can be reliably condensed on the inner surface of the lens frame 8, which is cooled before the objective lenses 1 and 2.

By the way, in order to further promote the effects of this embodiment, the protective cover 9 may be formed using a material with a large heat insulating effect, and the lens frame 8 may be insulated from the outside. Alternatively, a tip structure 42 as shown in FIG. 5 may be used. That is, a heat insulating filler layer 41 is provided to cover the outer periphery of the lens frame 8, and the first objective lens 1 and the lens frame 8 are bonded together using a heat insulating adhesive layer 40. and,
If you prevent the temperature of the lens frame 8 from rising to body temperature from the time the endoscope is inserted, and if you create a situation in advance where the temperature of the lens frame 8 is lower than the temperature of the objective lens 1.2, this situation can be solved by heat insulation. Because the filler layer 41 protects the outer surface of the first objective lens 1, even if cold cleaning water is injected from the cleaning nozzle 5 onto the outer surface of the first objective lens 1, which has been warmed by body temperature, only the first objective lens 1 will remain clean. The lens 1 and the space 3 on the inner surface side of the first objective lens 1 formed by the lens 1 and the lens frame 8 are not suddenly cooled down. As a result, even if steam has entered the space 3 between the objective lenses 1 and 2,
The vapor does not condense on the inner surface of the first objective lens 1, so the inner surface of the first objective lens 1 is not fogged, and a clear field of vision can always be ensured. Of course, it will be more effective if the tip structure 39 of this embodiment is combined with the tip structure 42 shown in FIG. 5.

FIG. 6 shows a third embodiment of the invention.

The objective optical system structure of the distal end component 44 of the endoscope in this embodiment also includes a first objective lens 1 and a second objective lens 2, which are fixed to the lens frame 8.

Further, on the distal end side of the distal end component 44, the fixing member 6 on the outer periphery of the lens frame 8 is dug down to expose the lens frame 8 to the outside, so that the cleaning water from the nozzle 5 is directed only to the first objective lens 1. It is also sprayed onto the outer periphery of the lens frame 8, thereby making it possible to directly cool the lens frame 8. However, in this case, in order to ensure the insulation of the endoscope tip, the holding member 43 is formed using an insulating material and is made electrically independent from other parts. This makes it possible to improve the drainage of water on the outer surface of the first objective lens 1.

Therefore, when the insertion portion 13 of the endoscope 12 having the distal end portion 44 having the above-mentioned configuration is inserted into a body cavity, cold cleaning water is applied from the cleaning nozzle 5 to the first objective lens exposed to body fluids or dirt. 1, the first objective lens 1 warmed by body temperature is cooled or the lens frame 8
Also, they are directly cooled by the washing water.

Therefore, almost no temperature difference occurs between the first objective lens 1 and the lens frame 8. Moreover, only the first objective lens 1 is a first objective lens formed by the first objective lens 1 and the lens frame 8, etc.
The space 3 on the inner surface side of the objective lens 1 is not suddenly cooled down. This allows even if the objective lens 1.
Even if steam enters the space 3 between the two, the steam will not condense on the inner surface of the first objective lens 1, so the inner surface of the first objective lens 1 will not become foggy, ensuring a clear field of view at all times. be able to.

Note that in this embodiment as well, the lens frame 8 is connected to the objective lens 1.
. , 2, such as aluminum, gold, silver, copper alloy, duralumin, etc., is more effective.

FIG. 7 shows a fourth embodiment of the present invention.

The objective optical system structure of the distal end component 45 of the endoscope in this embodiment includes a first objective lens 1 and a second objective lens 2, which are fixed to a lens frame 8. The distal end surface of the lens frame 8 has a larger exposed area to the outside than in the first embodiment, that is, the cooled portion of the lens frame 8 has been expanded. Further, in order to ensure electrical insulation, the lens frame 8 is isolated from surrounding metal parts by an insulating member 46 made of a material such as resin or ceramic.

Therefore, unlike the third embodiment, the tip component 45 having the above structure does not expose the lens frame 8 to the outside by digging down the fixing member 6 on the outer periphery of the lens frame 8.
The cleaning and disinfecting performance of the outer surface of the objective lens 1 is better than that of the third embodiment, and the lens frame can be effectively cooled without affecting other parameters such as drainage and cleaning performance. Note that the other effects are the same as those of the first embodiment.

By the way, as mentioned above, preventing the objective lens 1.2 from fogging and ensuring a clear field of vision is a prerequisite that other members are operating normally. That is, in the endoscope 12, if an abnormality occurs in the image guide, light guide, etc., a clear field of view cannot be obtained no matter what treatment is performed on the objective lens.

For example, the light guide 28 shown in FIG. 3 will be explained as an example. When a silicon tube 30, for example, having an inner diameter larger than the outer diameter of the tip cap 29 is fitted around the outer circumference of the light guide 28 and the silicon tube 30 is connected to the cap 29, a slack 47 as shown in FIG. 8 is created at the connection part. can.

This slack 47 is used for other built-in parts 48a, 48b, 48c.
... may cause the light guide 28 to break or the bending portion 15 to malfunction. Therefore, the slack 47 is connected to the other built-in parts 48a and 48b.

48c..., for example, in the direction shown in FIG. 9. In this way, the purpose of the present invention can only be achieved by taking care to ensure that members other than the objective lens operate normally.

On the other hand, the bending piece 25 of the endoscope bending part 15 is conventionally assembled by rotatably connecting a plurality of bending parts 25 with rivets 26, but the number of man-hours for assembly is very large. However, the problem is that the work becomes complicated.

However, the above-mentioned problem lies in the substantially cylindrical curved piece 50 having the configuration shown in FIGS. 10 to 14.

Solved by 55...

That is, on the end surface of the first curved piece 50 shown in FIGS. 10 and 11, two convex tongue portions 51 each having a circular arc portion 52 are provided facing each other in the radial direction.

In addition, on the end surface of the second curved piece 55 adjacent to and connected to the first curved piece 50, as shown in FIGS. Two matching recesses 56 are provided facing each other in the radial direction. Then, as shown in FIG. 13, the tongue portions 51 of the first curved pieces 50 having the above configuration and the recesses 56 of the second curved pieces 55 are sequentially engaged. The curved portion 15 of the endoscope is formed by stacking the ends together. Further, a blade (not shown) is fitted on the outer periphery of the curved pieces 50..., 55... in the axial direction, and the curved pieces 50... are fitted with this blade.

55... It strengthens the connection force by holding down comrades. Note that the tongue portion 51 and the recess 56 may be provided on the end surface of the same curved piece. For example, the tongue portion 51 may be provided on the end surface of the first curved piece, and the recess 56 may be provided on the end surface opposite to this tongue portion 51.

Therefore, the curved pieces 50..., 55... with the above configuration
The curved portion 15 constituted by the angle wire 6
0 is inserted into the not-illustrated wire receivers provided on the curved pieces 50..., 55..., and when one end thereof is fixed to the curved piece located at the leading edge and pulled, the tongue piece part 51 is pulled. The arc portion 52 rotates along the arc portion 57 of the recess 56 and is curved. At this time, the tongue portion 51 and the recess 56 come into contact with each other, so the curved piece 50...
, 55... They will not fall out between each other. Further, although the curved pieces 26 have conventionally been connected by caulking the rivets 26, the above configuration eliminates the need for caulking and can reduce the number of assembly steps.

In addition, even if the curved pieces 50.55 are made of metal,
Alternatively, it may be made of synthetic resin.

Furthermore, as other examples of the configuration of the curved top, those shown in FIGS. 15 to 17 can also be considered.

That is, two engaging portions 64 are provided on the end surface of the substantially cylindrical first curved piece 69 so as to face each other in the radial direction. This engaging portion 64 is constructed by arranging two semicircular guide plates 65 parallel to each other on the end surface and spaced apart from each other by a distance Ω. Further, on the end surface of the second curved piece 70, two guide grooves 67, which are engaged with the engaging portion 64 of the first curved piece 69, are provided so as to face each other in the radial direction. In the center of the guide groove 67, a circular fall-off prevention plate 68 whose wall thickness is thinner than the gap width g of the guide plate 65 is provided.
is provided. Note that the diameter of the guide groove 67 is formed to be slightly larger than the diameter of the guide plate 65 so that the guide plate 65 can be fitted therein.

Therefore, as shown in FIG.
The two guide plates 65 of 9 fit into and engage with the guide groove 67 of the second curved piece 70 in such a way as to sandwich the drop-off prevention plate 68. And the first
There is also a second plate on the end surface of the curved piece 69 opposite to the engaging part 64.
A guide groove 67 and a falling-off prevention plate 68 similar to those of the second curved piece 70 are provided, and the guide groove 67 of the second curved piece 70 is provided.
An engaging portion 64 similar to the first curved piece 69 is provided on the opposite end surface to connect the first curved piece 69 and the second curved piece 70, as shown in FIG. , curved top 69
．． The curved portion 15 is constructed via intermediary pieces 71, 72, etc. having the same configuration as 70.

Therefore, the curved pieces 69, 70°71.7 with the above configuration
In the curved part 15 formed by 2..., the angle wire 60 is inserted into the wire receiver part 66 provided at the curved pieces 69, 70, 71°, 72..., and one end thereof is positioned at the most distal end. By fixing the guide plate 65 to the curved piece and pulling it, the guide plate 65 rotates along the guide groove 67 and the drop-off prevention plate 68 and is curved.

By the way, conventionally, by pulling the angle wire,
A compressive force is applied to the curved piece, and as a result, the guide plate sometimes falls off from the guide groove, but with the above structure, the two guide plates 65 sandwich the fall prevention plate 68, so falling off is prevented. It is something that

On the other hand, in the light guide cord 21 (see FIG. 2), a rod lens was conventionally provided in the light guide connector 22, and the NA of this rod lens was the same as the NA of the light source 80.

Further, the connection portion 76 between the rod lens and the plastic fiber light guide 28 is connected to the housing 7 of the light source 80.
It was located within 8.

However, the plastic fiber light guide 28 is
Since A is small, when combined with a conventional rod lens, there will be a loss of light quantity at the connection part 76 and heat will be generated, and since the connection part 76 is inside the light source/X housing 78,
The plastic file/light guide 28 was affected by the heat and could burn.

Therefore, as shown in FIG.
The length of the rod lens 77 may be set to extend outside the housing 78 of the light source 80, and the NA of the rod lens 77 may be set to be less than or equal to the NA of the plastic fiber light guide 28 combined with the rod lens 77.

[Effects of the Invention] As explained above, according to the present invention, the insertion portion of the endoscope is inserted into the body cavity, and cold cleaning water is applied to body fluids, filth, etc. from the cleaning nozzle through the water supply pipe. When sprayed onto the exposed outer surface of the objective lens, the objective lens, which has been warmed by body temperature, is cooled down, but the lens frame that supports this objective lens is also directly cooled by the cleaning water.

Therefore, not only the objective lens but also the lens frame holding the objective lens is cooled, and only the objective lens is cooled to prevent condensation from condensing intensively on its inner surface.

As a result, even if steam enters the space on the inner surface of the objective lens, the vapor will not condense on the inner surface of the objective lens as much as possible, so the inner surface of the objective lens will not fog up, ensuring a clear field of view at all times. I can do it.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a partial sectional view of the distal end component of an endoscope, FIG. 2 is a schematic configuration diagram of the endoscope, and FIG. The figure is a sectional view showing a part of the curved part and the distal end component of the endoscope. FIG. 4 is a partial cross-sectional view of the distal end component of an endoscope showing a second embodiment of the present invention, and FIG. 5 is a distal end structure of an endoscope showing another means for preventing fogging of the objective lens. FIG. 6 is a partial sectional view of the distal end component of an endoscope showing a third embodiment of the present invention, and FIG. 7 is a partial sectional view of the distal end component of an endoscope showing a fourth embodiment of the invention. FIG. 3 is a partial cross-sectional view of the tip component of the mirror. FIG. 8 is a schematic diagram showing a silicone tube fitted into a light guide, and FIG. 9 is a cross-sectional view showing how the light guide and silicone tube shown in FIG. 8 are arranged inside the insertion section of an endoscope. . 1st
0 is a front view of the curved top, FIG. 11 is a side view of the curved top shown in FIG. 10, FIG. 12 is a side view of another curved top connected to the curved top shown in FIG. FIG. 14 is a front view of the curved top shown in the figure, and a sectional view showing how the curved top shown in FIG. 11 and the curved top shown in FIG. 12 are connected. FIG. 15 is a perspective view of a curved piece having a different configuration from the curved pieces shown in FIGS. 11 and 12, FIG. 16 is a sectional view showing the engaging means of the curved piece shown in FIG. 15, and FIG. FIG. 3 is a perspective view showing how the curved pieces shown in the figure are connected. FIG. 18 is a sectional view showing a preferred embodiment of connecting the light guide to the light source. DESCRIPTION OF SYMBOLS 1... First objective lens, 2... Second objective lens, 3... Space, 5... Cleaning nozzle, 6... Fixing member, 7... Tip component, 8 ...Lens frame, 9...
- Protective cover, 10... water supply channel. Applicant's agent Patent attorney Jun TsuboiFigure 6Figure 8Figure 10Figure 11Figure 12Figure 13Figure 14Figure 15Figure 16

Claims (1)

[Claims] Cleaning in which an objective lens is fixed through a lens frame within the distal end component, and cleaning water guided to the distal end of the endoscope via a water supply pipe is sprayed onto the objective lens near the objective lens. An endoscope provided with a nozzle for cleaning, characterized in that at least a part of the lens frame is provided in a spraying range of cleaning water from the nozzle or in the water supply pipe so that at least a part of the lens frame is substantially exposed. mirror.