JP2001087217A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope capable of preventing heat generation of a tip component due to adhesion of blood to an illumination optical system. SOLUTION: A transparent hood 35 is mounted at the tip component 8c to cover at least an objective optical system 12 and the illumination optical system 13. The transparent hood 35 is disposed outside the focal point (f) of the illumination optical system 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope in which a light-transmitting hood is attached to a distal end portion of an insertion portion inserted into a lumen.

[0002]

2. Description of the Related Art In general, by inserting an elongated insertion portion into a body cavity, an organ in the body cavity can be observed, and various treatments can be performed using a treatment tool inserted into a treatment tool channel as necessary. Endoscopes are widely used.

[0003] The endoscope is provided with a light guide formed by an optical fiber. The proximal end of the light guide is connected to an external light source device. Further, a distal end component in which an objective optical system and an illumination optical system are disposed is disposed at a distal end of the insertion section of the endoscope. An illumination lens for illuminating the observation site with light from the light guide is disposed in the illumination optical system of the distal end component. Then, the illumination light emitted from the external light source device is guided to the distal end portion side of the insertion section through the light guide of the endoscope, and emitted from the illumination lens toward the subject.

[0004]

By the way, in recent years, heat generation from the illumination optical system in the distal end component of the endoscope has become a problem due to the increase in luminance of light emitted from the light source device. For example, in an endoscopic external surgery on the abdomen, chest, or nasal cavity, blood may adhere to the distal end component of the endoscope due to bleeding during the operation.

[0005] In such a surgical procedure involving bleeding, when blood or the like does not adhere to the objective optical system but adheres only to the illumination optical system, the problem of heat generation from the illumination optical system is remarkable. That is, when blood adheres to the distal end component of the illumination optical system, part of the illumination light is blocked by the adhered blood. Therefore, there is a problem that the amount of illumination light applied to the observation site is reduced.

Here, in an endoscope system in which the amount of emitted light is controlled by automatic light adjustment, since the brightness of the obtained final image is not sufficient, the emitted light from the light source device is controlled to be further increased. Would. Therefore, the light emitted from the light source device is always in a full light emission state.

Further, in this case, the outgoing light is absorbed by the blood adhering to the distal end portion of the endoscope, and the absorbed light is converted into heat. At this time, since the blood is not attached to the objective optical system, the procedure is continued without any abnormality being confirmed to the operator who is observing. Therefore, the distal end component of the endoscope generates more heat, and the distal end component of the endoscope becomes even hotter.

Further, when an illumination optical system having a convex lens a as shown in FIG. 5 is used in the distal end component of the endoscope, this phenomenon becomes more remarkable. In FIG. 5, b
Is a light guide fiber. Then, in the illumination optical system using the convex lens a, as shown in FIG. 5, the illumination light emitted from the emission end face of the light guide fiber b collects once near the focal position f of the convex lens a. For this reason, since the light density becomes high near the focal position f of the convex lens a, when blood or the like adheres to the vicinity of the focal position f of the convex lens a, the light is easily absorbed by the blood. As described above, when the illumination optical system having the convex lens a is used, the end component of the endoscope is more likely to generate heat.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope which can prevent the tip component from generating heat due to blood or the like adhering to an illumination optical system. It is in.

[0010]

According to the present invention, an objective optical system and an illumination optical system are provided, and at least the objective optical system is provided at a distal end portion disposed at a distal end of an insertion portion inserted into a lumen. And a translucent hood for covering the illumination optical system, and the translucent hood is arranged outside a focal position of the illumination optical system. And
By attaching a translucent hood to the tip component, blood adheres only to the illumination optical system and prevents blood from adhering to the objective optical system, as in the past, and prevents blood from adhering to the operator. Prevent you from knowing. Also, in an illumination optical system using a convex lens, since the focal position is located inside the translucent hood, the density of the illuminating light on the outer surface of the translucent hood is low, and blood or the like adheres to the illuminating light. This is to reduce absorption and heat.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3A and 3B. FIG. 1 shows a schematic configuration of an entire system of an endoscope apparatus 1 including an endoscope 6 according to the present embodiment. The endoscope device 1 includes an endoscope unit 2 externally attached to a television camera, a light source device 3 for supplying illumination light to the endoscope unit 2, and a video signal for performing signal processing on an image sensor of the endoscope unit 2. It comprises a processing device 4 (or a video processor) and a monitor 5 for displaying a video signal output from the video signal processing device 4.

Further, the television camera external endoscope unit 2 comprises a flexible endoscope 6 as an optical endoscope and a television camera 7 detachably mounted on the flexible endoscope 6. . The flexible endoscope 6 includes an insertion section 8, a grip section 9 provided at a rear end thereof, and an eyepiece section 10. And
A television camera 7 is detachably mounted on the eyepiece 10. In the television camera 7, C is used as an image pickup device.
The CD 11 is built in.

The insertion portion 8 of the endoscope 6 has an elongated flexible tube portion 8a, a curved portion 8b disposed on the distal end side of the flexible tube portion 8a, and a distal end side of the curved portion 8b. There is provided a connected distal end component 8c. Here, the tip component 8
c, one objective optical system 12 and 2 as shown in FIG.
Two illumination optical systems 13 are provided. Further, the objective optical system 12 is provided with an objective lens unit 15 in which a plurality of objective lenses 14 are combined. The image of the subject formed by the objective lens unit 15 is transmitted to the eyepiece 10 via an image guide (not shown) formed by, for example, an optical fiber.

In the present embodiment, each illumination optical system 13
Uses a convex lens 16 as an illumination lens. The convex lens 16 is provided at the tip of a light guide 17 formed by an optical fiber for guiding illumination light. The distal end of the light guide 17 is fixed to the distal end component 8c.

Further, a light guide base is provided on the holding portion 9 of the endoscope 6. One end of a light guide cable 18 is connected to the light guide base.
A light guide connector 19 is provided at the other end of the light guide cable 18. And the endoscope 6
The base end side of the light guide 17 inserted into the insertion portion 8 extends from the inside of the holding portion 9 to the light guide connector 19 via the inside of the light guide cable 18.

The light source device 3 is provided with a light guide connector receiver 20. The light guide connector 19 of the light guide cable 18 is detachably connected to the light guide connector receiver 20.

Further, a lamp 21 for supplying illumination light to the light guide 17 is provided inside the light source device 3. The lamp 21 has an elliptical reflecting mirror, and condenses light at the incident end of the light guide 17. The lamp 21 is connected to a lamp power supply 22. Then, the lamp 21 is turned on by the lamp lighting power supplied from the lamp power supply 22.

In the optical path between the lamp 21 and the light guide connector receiver 20, a pattern 23 for adjusting the amount of light passing therethrough is provided. A motor 24 for operating the aperture 23 is connected to an aperture drive circuit 25. The stop drive circuit 25 controls the rotation of the motor 24 of the stop 23 so that the amount of illumination light supplied to the light guide 17 can be controlled.

The lamp power supply 22 and the aperture driving circuit 2
Reference numeral 5 is connected to a control circuit 26 provided in the light source device 3, and is controlled by the control circuit 26.
An over-illumination detection circuit 27 for detecting over-illumination is further connected to the control circuit 26. This over-illumination detection circuit 27
Is connected to a warning means 28.

One end of a camera cable 29 is connected to the television camera 7. This camera cable 2
9 is provided with a signal connector 30 at the other end.
Here, the video signal processing device 4 has a signal connector receiver 3.
1 is provided. The signal connector 30 of the camera cable 29 is detachably connected to the signal connector receiver 31 of the video signal processing device 4.

The video signal processing device 4 includes a CCD drive circuit 32, a video signal processing circuit 33, and a brightness detection circuit 34. Here, camera cable 2
9 is connected to the signal connector receiver 31 of the video signal processing device 4, the CCD 11 is connected to the output terminal of the CCD driving circuit 32 in the video signal processing device 4 and the video signal processing circuit via the signal line. 33 are connected to the respective input terminals.

Further, the video signal processing circuit 33 has two output terminals. One output terminal is connected to the monitor 5 via a signal line, and the other output terminal is connected to an input terminal of the brightness detection circuit 34 via a signal line. The output terminal of the brightness detection circuit 34 is connected to the brightness signal input terminal of the light source device 3. The brightness signal input terminal of the light source device 3 is connected to a control circuit 26.
As shown by a dotted line in FIG. 1, it may be connected to the over-illumination detection circuit 27.

The distal end component 8 of the insertion portion 8 of the endoscope 6
A transparent transparent hood (translucent hood) 35 is detachably attached to c. The transparent hood 35 is formed in a substantially hemispherical shape by a plastic material as shown in FIG. Here, the transparent body hood 35 made of plastic has a substantially hemispherical shape with the center on the entrance pupil position P of the objective optical system 12.

Further, in this embodiment, the illumination optical system 13
The convex lens 16 is used, but the focal position f of the convex lens 16 is arranged so as to be inside the plastic transparent hood 35. Further, a configuration in which a concave lens 36 (see FIG. 3B) is used instead of the convex lens 16 as the illumination lens of the illumination optical system 13 may be employed.

FIG. 3A shows the state of emission of illumination light when the convex lens 32 is used for the illumination optical system 13, and FIG.
Shows the emission state of the illumination light when the concave lens 36 is used for the illumination optical system 13. Here, the optical path of the illumination light emitted from the emission end of the light guide 17 is shown in FIG.
As shown in FIG. 3B, the beam diameter of the concave lens 36 increases, whereas the optical path of the illumination light when the convex lens 32 is used in the illumination optical system 13 has a focal position f as shown in FIG. The light beam diameter is once pinched by, and then spreads.

Next, the operation of the above configuration will be described.
When using the endoscope apparatus 1 of the present embodiment, the power switch of the light source device 3 is turned on. When the power switch of the light source device 3 is turned on, the control circuit 26 controls the lamp power supply 22 to turn on the lamp 21. At this time, the illumination light supplied from the lamp 21 to the light guide 17 is
It is guided to the distal end side of the insertion portion 8 by the light guide 17,
The front end of the light guide 17 irradiates the diseased part in front through the convex lens 16 of each illumination optical system 13. Here, the object irradiated with the illumination light is imaged by the objective lens system 12 and transmitted to the eyepiece unit 10 via an image guide (not shown).

When the power switch of the light source device 3 is turned on, the CCD drive circuit 32 in the video signal processing device 4 is simultaneously driven. At this time, a CCD drive signal from the CCD drive circuit 32 is applied to the CCD 11 in the television camera 7. Then, the endoscope image of the subject transmitted to the eyepiece 10 side of the endoscope 6 is formed on the CCD 11 and photoelectrically converted. Further, the image pickup signal photoelectrically converted by the CCD 11 is input to a video signal processing circuit 33 and subjected to signal processing. The video signal output from the video signal processing circuit 33 is output to the monitor 5, and an endoscopic image of the subject is displayed on the monitor 5.

The brightness signal output from the video signal processing circuit 33 is input to a brightness detection circuit 34, which generates a brightness signal and sends it to the brightness signal input terminal of the light source device 3. The brightness signal input from the brightness signal input terminal is input to the control circuit 26.

The control circuit 26 outputs a signal for controlling the aperture driving circuit 25 based on the brightness signal from the video signal processing device 4, and also outputs this signal to the over-illumination detection circuit 27. Then, the aperture driving circuit 25 drives the motor 24 based on a signal from the control circuit 26 to control the opening / closing amount of the aperture 23, adjust the amount of illumination, and automatically adjust the brightness signal level to be constant. To adjust.

A signal supplied from the control circuit 26 to the aperture driving circuit 25 is input to the over-illumination detection circuit 27, and the over-illumination detection circuit 27 detects from the signal whether or not an over-illumination state occurs. Here, in the over-illumination detection circuit 27, the control circuit 26 controls the motor 24 based on the signal output to the aperture drive circuit 25.
When the signal for opening the aperture 23 to a predetermined value or more within a short time is detected in a short time,
Generates an over-illumination detection signal. When the over-illumination detection circuit 27 detects an over-illumination state, it outputs a detection signal to the warning unit 28 to perform a warning operation.

The brightness signal input from the brightness signal input terminal of the light source device 3 is represented by a dotted line in FIG.
The configuration may be such that the signal is also input to the over-illumination detection circuit 27 that detects over-illumination.

Further, for example, in endoscopic surgery for the abdomen, chest, or nasal cavity, blood may adhere to the transparent hood 35 of the distal end component 8c of the endoscope 6 due to bleeding during the operation. is there. When blood or the like adheres to the outer surface of the transparent hood 35 of the distal end portion 8c of the insertion portion 8 in this manner, the observation portion has the same effect as in the dark state, the aperture 23 is in the open state, and the illumination light amount is reduced. Increase. Therefore, in such a state, a detection signal of over-illumination is not generated.

Here, suppose that the distal end portion 8c of the insertion portion 8 is provided.
In the case where the transparent hood 35 of the present embodiment is not provided, the illumination optical system 13 using the convex lens 32 loses illumination light due to the adhesion of blood as described above, and the endoscope 6
Is likely to generate heat at the tip constituting portion 8c. for that reason,
As described above, the distal end portion 8c of the insertion section 8 of the endoscope 6 is heated, and a problem such as a burn occurs.

On the other hand, in this embodiment, the convex lens 1
The focal position f of 6 is arranged inside the transparent hood 35 made of plastic. Therefore, in the present embodiment, the light path of the illumination light emitted from the emission end of the light guide 17 has a light flux diameter once interposed at the focal position f of the convex lens 32 as shown in FIG. On the surface of the transparent body hood 35, the luminous flux density of the illumination light is small. Therefore, when blood adheres to the transparent body hood 35, even the illumination optical system 13 using the convex lens 16
Since the luminous flux density of the illumination light on the surface of the transparent body hood 35 to which blood or the like has adhered is small, blood hardly coagulates,
Since there is no heat generation at the distal end component 8c of the endoscope 6,
The temperature of the distal end component 8c of the endoscope 6 does not rise.

Therefore, the above configuration has the following effects. That is, in the present embodiment, the transparent body hood 35 is provided at the distal end component 8c of the endoscope 6, and the illumination optical system 1
Since the focal position f of the third convex lens 16 is located inside the substantially hemispherical transparent hood 35, the convex lens 16
In the illumination optical system 13 using the light source, the luminous flux density of the illumination light on the surface of the transparent body hood 35 is small. Therefore, even when blood or the like adheres to the surface of the transparent body hood 35, the blood does not easily coagulate and does not generate heat at the distal end component 8 c of the endoscope 6. Will not rise.

Since the blood adheres to the transparent hood 35, the state of the blood adhered to the transparent hood 35 is reflected in the endoscope image. Therefore, the surgeon must monitor
By observing the endoscope image of the endoscope 6, it is possible to easily confirm the state in which blood is attached to the distal end component 8 c of the endoscope 6. That is, blood or the like adhering to the surface of the transparent body hood 35 can be observed by an operator by the objective optical system 12.

In this case, the surgeon pulls the endoscope 6 out of the body, removes the adhered blood by processing such as wiping the distal end portion 8c of the endoscope 6, and removes the endoscope 6 in a clean state. You will be able to continue using it.

The transparent body hood 35 is connected to the objective optical system 12.
Has a substantially hemispherical shape centered on the entrance pupil position P of the transparent hood 35 at almost all viewing angles.
, The light rays are almost aberration-free for each light ray, which is advantageous in terms of image quality.

By providing a water-repellent coating on the surface of the transparent hood 35, the transparent hood 35
Blood can be made more difficult to adhere to the surface of the surface.
Further, the transparent body hood 35 is spherical in shape, and the center of the spherical surface does not need to be strictly aligned with the entrance pupil position P of the objective optical system 12, and this shape is disadvantageous in terms of image quality. Never.

FIG. 4 shows a second embodiment of the present invention. In the present embodiment, the configuration of the transparent hood 35 of the first embodiment (see FIGS. 1 to 3A and 3B) is changed as follows.

That is, in the first embodiment, the transparent hood 35 having a substantially hemispherical shape is shown, but in the present embodiment, as shown in FIG. 42 are provided. Here, a corner portion 43 is formed around the distal end flat surface 42 of the transparent body hood 41. Many endoscopes 6 generally have a viewing angle θ of 100 degrees or more, and if these corner portions 43 enter the observation section of the endoscope 6, they hinder observation. May be Therefore, the corner portion 43 of the transparent body hood 41
It is necessary to arrange the transparent hood 41 and the distal end component 8c of the endoscope 6 close to each other in order to prevent from entering the observation part of the endoscope 6. If the distance between the transparent hood 41 and the distal end portion 8c of the endoscope 6 is too close, the focal position f of the convex lens 16 as the illumination lens of the illumination optical system 13 will be outside the transparent hood 41 or the transparent hood. 4
Since the focal point f of the convex lens 16 is located inside the transparent hood 41, the transparent hood 41 and the distal end portion 8c of the endoscope 6 can be located at the position of the transparent lens. It is necessary to arrange them closely.

Therefore, in the present embodiment, similarly to the first embodiment, the focal position f of the convex lens 16 of the illumination optical system 13 is set.
Is arranged inside the transparent body hood 41,
Also in the illumination optical system 13 using the convex lens 16, the luminous flux density of the illumination light on the surface of the transparent hood 35 is small. Therefore, even when blood or the like adheres to the surface of the transparent body hood 41, the blood does not easily coagulate and does not generate heat at the distal end component 8c of the endoscope 6, so that the temperature of the distal end component 8c of the endoscope 6 does not increase. Will not rise.

Although the above embodiments have been described using the removable plastic hoods 35 and 41 made of plastic, glass or the like may be used instead of plastic as long as the material is transparent. Further, the transparent hoods 35, 41 may be fixed to the distal end component 8c of the endoscope 6.

In each of the above embodiments, the direct-view endoscope 6 is used.
However, the transparent hoods 35 and 41 may be provided in a side view or oblique endoscope, or a rigid endoscope may be used.

The insertion section 8 of the endoscope 6 is composed of a first component for accommodating an image guide and a second component for forming an outer cylinder of the insertion section 8, and this first configuration is provided. Part and second
The object of the present invention can be solved by arranging a light guide bundle for transmitting illumination light in an internal space formed between the light guide bundle and the light guide bundle.

Further, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. Next, other characteristic technical matters of the present application will be additionally described as follows. (Additional Item 1) At least in the transparent hood disposed at the distal end of the endoscope including the pair of objective optical system and the illumination optical system, the focal position on the object side of the illumination optical system is more illuminated than the transparent hood. An endoscope apparatus provided on an optical system side.

(Additional Item 2) In an endoscope system in which a transparent hood is disposed at a distal end portion of an endoscope including at least a pair of an objective optical system and an illumination optical system, the illumination optical system has a positive value. An endoscope apparatus having a focal length, wherein a focal position on the object side of the illumination optical system is closer to the illumination optical system than the transparent hood.

(Additional Item 3) The endoscope apparatus according to additional items 1 and 2, wherein the transparent hood is substantially spherical.

(Additional Item 4) An endoscope apparatus according to additional item 3, wherein the range of the viewing angle of the objective optical system of the endoscope is the same arc shape.

(Additional Item 5) The endoscope transparent body hood according to Additional Item 3, wherein the spherical center of the substantially spherical transparent hood is substantially at the center of the entrance pupil of the objective optical system.

(Additional Item 6) In the additional items 1 and 3, the transparent body hood is characterized in that the range of the viewing angle of the objective optical system of the endoscope is a plane perpendicular to the objective optical system. .

(Additional Item 7) The endoscope apparatus according to additional items 1 to 6, wherein the transparent hood is detachable.

(Prior Art of Supplementary Items 1 to 7)
The present invention relates to a transparent hood attached to the end of an endoscope. By inserting an elongated insertion part into the body cavity,
2. Description of the Related Art An endoscope capable of observing an internal organ of a body cavity and performing various medical treatments using a treatment tool inserted into a treatment tool channel as necessary is widely used. The endoscope is provided with a light guide that guides the illumination light emitted from the external light source device to the insertion portion and emits the light toward the subject.The light guide from the end guide illuminates the observation site with light from the light guide. Illumination lenses are arranged.

(Problems to be Solved by Additional Items 1 to 7)
By the way, in recent years, by increasing the brightness of light emitted from a light source,
Heat generation at the distal end of the endoscope is becoming a problem. In endoscopic external surgery on the abdomen, chest, or nasal cavity,
Blood may adhere to the tip of the endoscope due to bleeding during surgery. In such a surgical procedure involving bleeding, this problem is remarkable when blood or the like does not adhere to the objective optical system but adheres only to the illumination optical system. At this time, blood adheres to the tip of the illumination optical system, so that light applied to the observation site is blocked.

However, in an endoscope system in which the amount of emitted light is controlled by automatic light adjustment, the emitted light from the light source is further increased because the brightness of the obtained final image is not sufficient. Therefore, the emitted light from the light source is always in a full light emission state, and the emitted light is absorbed by blood attached to the end of the endoscope, and the absorbed light becomes heat. At this time, since the blood is not attached to the objective optical system, the procedure is continued without any abnormality being confirmed by the observer, and the endoscope further generates heat. As a result, the endoscope tip becomes increasingly hot. Further, when an illumination optical system having a convex lens at the end of the endoscope is used, this phenomenon becomes more remarkable.

As shown in FIG. 1, in an illumination optical system using a convex lens, light collects once near a focal position. Therefore, the light density is high near the focal position of the convex lens, and the light is easily absorbed by blood when blood or the like adheres.
As described above, when the conventional illumination optical system having a convex lens is used, the end of the endoscope is more likely to generate heat.

(Objects of Additional Items 1 to 7) It is an object of the present invention to prevent blood and the like from adhering to the illumination optical system so that the distal end portion of the endoscope does not generate heat.

(Means for Solving the Problems of Additional Items 1 to 7) In order to solve the above problems, in the present invention, a transparent hood is provided at the end of the endoscope. In this case, the focus position of the illumination optical system is characterized by being located closer to the illumination optical system than the transparent hood. Further, the transparent hood is substantially spherical with the entrance pupil of the objective optical system being substantially at the center. By attaching the transparent body hood to the distal end of the endoscope, blood adheres only to the illumination optical system and blood does not adhere to the objective optical system, so that the operator does not know. Also, in an illumination optical system using a convex lens, since the focal point is located inside the transparent hood, the density of the illumination light on the outer surface of the transparent hood is low, and blood and the like adhere to absorb the illumination light. It does not become heat. Further, the transparent hood has a substantially spherical shape centered on the entrance pupil of the objective optical system, which is advantageous for the observation side.

(Effects of Additional Items 1 to 7) The problem can be solved. In addition, since the blood is attached to the cover by providing the cover, the blood adhered to the endoscope image is reflected in the endoscope image. You will be able to confirm that. Then, the operator pulls out the endoscope, wipes the tip, etc.,
The blood adhesion is removed, and the use of the endoscope can be continued in a clean state. Further, by providing a water-repellent coating on the surface of the object side surface of the cover, it is possible to make blood less likely to adhere.

[0060]

According to the present invention, a translucent hood that covers at least the objective optical system and the illumination optical system is mounted on the distal end component, and the translucent hood is disposed outside the focal position of the illumination optical system. In addition, it is possible to prevent blood or the like from adhering to the illumination optical system and generate heat at the distal end component.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an entire system of an endoscope apparatus according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the endoscope according to the first embodiment, showing a state in which a hood is attached.

FIG. 3A is an explanatory view showing an emission state of illumination light when a convex lens is used for the illumination optical system of the endoscope according to the first embodiment, and FIG. 3B is a diagram showing a concave lens used for the illumination optical system; FIG. 5 is an explanatory diagram showing an emission state of illumination light when the illumination is performed.

FIG. 4 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an emission state of illumination light when a convex lens is used in an illumination optical system of a conventional endoscope.

[Explanation of symbols]

 Reference Signs List 8 Insertion part 8c Tip configuration part 12 Objective optical system 13 Illumination optical system 35 Transparent hood (translucent hood) f Focus position

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeaki Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Shinsho Yasukui 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Inside Olympus Optical Kogyo Co., Ltd. (72) Inventor Mitsuru Ito 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside (72) Inventor Tomoyuki Takashino 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Inside Olympus Optical Industry Co., Ltd. (72) Inventor Keiji Handa 2-4-2, Hatagaya, Shibuya-ku, Tokyo Inside (72) Inventor Akira Kikuchi 2-43 Hatagaya, Shibuya-ku, Tokyo No.2 Olympus Optical Co., Ltd. (72) Inventor Makoto Tomioka 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. in the F-term (reference) 2H040 BA00 BA11 CA10 CA12 CA22 DA12 4C061 AA00 BB01 CC01 DD01 FF37 FF40 JJ11

Claims (1)

[Claims] 1. An optical system in which an objective optical system and an illumination optical system are provided, and at least a distal end component disposed at a distal end of an insertion portion inserted into a lumen covers at least the objective optical system and the illumination optical system. An endoscope comprising a transparent hood mounted thereon, and the translucent hood disposed outside a focal position of the illumination optical system.