JP2001221960A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an operator to easily recognize a positional relation of both observation images of a wide angle image and a magnified image when carrying out endoscope operation while observing the wide angle image. SOLUTION: When the wide angle image of the observation images using the endoscope is displayed on the left side of a monitor 17 and the magnified image on the right side, a reticle 10 is displayed on the wide angle image and the visual field center of the magnified image is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope which is inserted into a subject to observe the inside.

[0002]

2. Description of the Related Art In recent years, by inserting an elongated insertion portion into a body cavity, it is possible to observe an organ in the body cavity, and if necessary,
2. Description of the Related Art An optical fiber endoscope capable of performing various treatments using a treatment tool inserted into a treatment tool channel is widely used.

[0003] Boilers, gas turbine engines,
Scratches inside scientific plants, internal parts such as automobile engines,
Industrial endoscopes are widely used for observation and inspection of corrosion and the like.

Further, electronic endoscopes using a solid-state imaging device such as a charge-coupled device (CCD) as an imaging means are widely used in various fields.

[0005] Such an endoscope usually has a single objective optical system fixed thereto, and is set in advance to an angle of view that can cope with a series of operations of insertion, observation and removal of the endoscope.

On the other hand, a certain observation target site is observed at a high magnification.
For diagnostic applications, an endoscope with only a high-magnification (magnification) objective optical system has a very narrow field of view and a shallow depth of field, so it is difficult to determine which part is being observed during use. ,
For example, as disclosed in Japanese Utility Model Laid-Open No. 1-120155, two objective optical systems of a wide angle and an enlargement are provided so that a wide-range observation image and an enlarged image of a main part can be simultaneously observed. And JP-A-1-1052
As disclosed in Japanese Patent Publication No. 13-213, two types of objective optical systems, wide-angle and magnifying, are selectively selected, and a magnifying magnification is selected as necessary, thereby facilitating orientation until reaching the observation target site. Known to be attached to the.

[0007]

However, for example, when observing unevenness of mucous membranes, running of capillaries, and the like from an enlarged image of the mucosal surface of a luminal organ in a body cavity to diagnose a lesion on the mucosal surface, the object to be observed is It is necessary to enlarge the site at a very high magnification.

Therefore, in such a case, the endoscope operation is performed while observing the wide-angle image which can be easily oriented as described above until the end of the insertion section reaches the observation site. The diagnosis will be made by observing.

At this time, there is no problem if the state of the affected part to be magnified and observed is clearly visible both in the wide-angle image and the magnified image and the correspondence between the two images is clear.
If it is difficult to distinguish the observation target site from the surrounding normal tissue, it is necessary to confirm the difference in the surface of the mucous membrane and determine the range of the lesion.

[0010] However, in the above-described prior art, it is not possible to easily grasp the position of the magnified observation site in the wide-angle observation image, and it may be difficult to specify the affected part.

Therefore, in view of the above circumstances, the present invention makes it possible to easily recognize the positional relationship between both the wide-angle image and the enlarged image when performing an endoscope operation while observing the wide-angle image. It is an object of the present invention to provide an endoscope that is possible and can perform a lesion diagnosis more reliably.

[0012]

In order to achieve the above object, the present invention provides an object capable of at least switching between wide-angle and magnified observation at the tip of an insertion portion inserted into a body cavity for observing a site to be observed. An endoscope provided with an optical system is characterized in that an index indicating a visual field position on an enlarged side is provided in an observation visual field on a wide angle side.

In such a configuration, when the endoscope is operated while observing the wide-angle image, the index indicating the position of the field of view on the enlarged side is displayed in the observation field of view of the endoscope. Also, the user can easily grasp the position of the enlarged observation site.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 3 relate to a first embodiment of the present invention, and FIG. 1 is an explanatory view showing the entire configuration of an endoscope.
FIG. 3 is an explanatory view of a cover glass disposed at the end of the wide-angle image guide, and FIG. 3 is an explanatory view showing an endoscope image displayed on a monitor.

As shown in FIG. 1, the endoscope 1 has an elongated and flexible insertion portion 2 and a rear end of the insertion portion 2
The operation unit 3 held by the user is connected. Operation unit 3
Is provided with an operation lever (not shown) for performing a bending operation on a bending portion provided near the distal end portion of the insertion section 2.

A flexible light guide cable 4 extends laterally from the operation unit 3, and a connector (not shown) is provided at an end of the light guide cable 4. The rear end of the operation unit 3 has a wide angle,
Two eyepieces 5W and 5M for enlarging an enlarged endoscope image are provided.

At the distal end portion 9 of the insertion portion 2, two types of wide-angle and enlarged objective lens groups 8W and 8M having a predetermined viewing angle are provided.
Is provided. For example, wide-angle side objective lens group 8W
Has a viewing angle set to 120 °, and the objective lens group 8M on the magnification side has a viewing angle set to 30 °.

The image guides 6W, 6 made of fiber bundles are located at the image forming positions of the objective lens groups 8W, 8M.
The tip surface of M is arranged. This image guide 6
W and 6M are inserted into the insertion section 2, and their rear ends are respectively guided to the eyepieces 5W and 5M. Cover glasses 7W, 7M are arranged on the rear end surfaces of the image guides 6W, 6M.

As shown in FIG. 2, the cover glass 7W disposed on the end face of the image guide 6W on the wide-angle side includes:
The reticle 10 is vapor-deposited, and the reticle 10 and the stacking direction of the fibers of the image guide 6W are fixed so that they are uniquely positioned.

The reticle 10 serves as an index indicating the position of the observation image on the enlarged side in the image on the wide angle side, and is set so that the intersection point coincides with the center of the observation image on the enlarged side.

Further, eyepieces 11W and 11M provided in the eyepieces 5W and 5M are provided opposite to the rear ends of the cover glasses 7W and 7M.

A light guide 12 is inserted into the insertion section 2 and the light guide cable 4, and a front end of the light guide 12 is fixed to a front end 9 of the insertion section 2, and a rear end of the light guide 12. Is connected to a connector provided at the end of the light guide cable 4, and this connector is connected to a light source device (not shown).

Illumination light from a light source device is guided to the distal end of the light guide 12 via the light guide 12, and the illumination light from the distal end is applied to an affected part through an illumination lens (not shown).

An external television camera 13 can be detachably attached to the eyepieces 5W and 5M. Each of the external television cameras 13 includes an imaging lens 14 for imaging light from an eyepiece, and an imaging lens 14.
And a CCD 15 arranged at the image forming position.

On the other hand, the CCD 15 of both TV cameras 13 is
The CCD 15 is connected to a camera control unit (CCU) 16 for processing image signals picked up by the CCD 15.
A monitor 17 for displaying an observation image is connected to the CU 16.

Note that the two external television cameras 13 may be integrated. In addition, two images taken by each television camera 13 are arranged on the monitor 17 on one screen, or two monitors are arranged corresponding to each television camera 13, and two monitors are arranged on each monitor. One image may be output separately.

(Operation) Next, the operation of the present embodiment having the above configuration will be described. When the insertion section 2 of the endoscope 1 is inserted into an observation target organ (bronchi, stomach, or the like) of a patient, illumination light from a light source device is guided by a light guide 12 and is provided at a distal end portion 9 of the insertion section 2. The inside of the lumen is illuminated from the lighting window.

The image of the observation site illuminated by the illumination light is formed on the end faces of the image guides 6W and 6M by the objective lenses 8W and 8M of wide-angle and magnification, respectively. The observation images transmitted by the image guides 6W and 6M are enlarged by the eyepieces 11W and 11M, and the images are displayed on the monitor 17 via the television camera 13 and the CCU 16.

At this time, as shown in FIG. 3, the reticle 10 deposited on the cover glass 7W is displayed on the image on the wide angle side (left side in the drawing). The observation image transmitted by the image guide 6W on the wide-angle side allows the observed portion to be seen over a wide range, and is effective for guiding the endoscope tip to the observation target site.

Then, after the distal end 9 of the insertion section 2 reaches the observation target site, the center of the reticle 10 seen in the wide-angle observation image (left side in the drawing) is aligned with the diseased part as shown in FIG. At this time, the enlarged image (right side in the drawing) projected by the image guide 6M on the enlarged side is the reticle center position of the wide-angle image.

As a result, while observing the whole image including the periphery of the affected part macroscopically, a part that the operator needs to magnify and observe
You can select and observe immediately and accurately.

Then, the diagnosis is performed by observing the enlarged image of the affected part, and the whole of the affected part is grasped while corresponding to the wide-angle image.

As described above, according to the present embodiment, the operation of guiding the endoscope to the affected part is performed while observing the wide-angle screen, and the enlargement of the target portion is performed by another optical system. The efficiency of endoscope diagnosis is dramatically improved.

Further, since the accurate position of the enlarged image can be observed while confirming it with a wide-angle image, not only the diagnosis of a limited portion of the mucosal surface but also the diagnosis of the entire lesion can be accurately performed. Easy to use.

(Second Embodiment) FIGS. 4 and 5 relate to a second embodiment of the present invention. FIG. 4 is an explanatory view of a cover glass disposed at the end of the wide-angle image guide, and FIG. FIG. 5 is an explanatory diagram showing an endoscope image displayed in FIG.

In the first embodiment, the reticle 10 is vapor-deposited on the cover glass 7W. In the present embodiment, the frame 19 is used as an index indicating the enlarged visual field region.
It is deposited on W.

That is, as shown in FIG. 4, the cover glass 18 disposed on the end face of the image guide 6W on the wide-angle side.
On the surface of W, the frame 19 deposited is set to a size indicating the observation field of view on the enlargement side, and the end surface of the image guide 6W is placed on the end face of the image guide 6W so that the positional relationship with the enlarged image corresponds. The cover glass 18W is fixed in a uniquely positioned state. Note that the other configuration is the same as that of the first embodiment, and the description is omitted here.

(Operation) In such a configuration, as shown in FIG. 5, the viewing area image of the enlarged image (right side in the drawing) from the image guide 6M on the enlargement side displayed on the monitor 17 is replaced with the image on the wide-angle side. The operator corresponds to a part surrounded by a frame 19 displayed on the left side of the drawing (the left side of the drawing), and the operator observes an enlarged image of the affected part and makes a diagnosis, as in the first embodiment.
The entire image of the affected area is grasped while correlating with the wide-angle image.

As a result, according to the present embodiment, it is possible to grasp the enlarged visual field area while observing the image on the wide angle side. It becomes easy to identify.

Further, since the enlarged visual field region can be known on the wide-angle screen, the magnification can be grasped sensuously, and the diagnostic efficiency is further improved.

(Third Embodiment) FIG. 6 is an explanatory diagram showing an endoscope image according to a third embodiment of the present invention. In the present embodiment, a light guide fiber for guiding laser light from a laser beam transmitter (not shown) is provided in the insertion portion of the endoscope.

The light emitting end of the light guide fiber is fixed to the distal end of the insertion portion, and the laser beam emitted from the light emitting fiber is positioned so as to irradiate the center position of the enlarged visual field with a spot.

Therefore, in this embodiment, the laser beam 20
Since the spot observation indicates an enlarged observation site, it is not necessary to provide an index such as a reticle or a frame on the wide-angle side cover glass surface.

(Operation) In such a configuration, diagnosis is performed while observing both wide-angle and enlarged screens, as in the first embodiment. However, in this embodiment, an enlarged visual field is usually displayed on a wide-angle screen. Since there is no index indicating the position, the observation field is not obstructed by the index.

Then, if necessary, the laser beam 20 is irradiated with a spot to confirm an enlarged observation site on a wide-angle screen.

As described above, in the present embodiment, the enlarged observation region is indicated by the laser beam, so that the enlarged visual field position can be displayed or not displayed as necessary, and the display hinders the observation. In this case, by not displaying the image, a clear endoscopic image can be obtained, and the diagnostic efficiency is further improved.

(Fourth Embodiment) FIG. 7 is an explanatory view showing the entire configuration of an endoscope according to a fourth embodiment of the present invention.
In the present embodiment, the CCD 2
3 shows a so-called electronic endoscope incorporating 3W and 23M.

As shown in FIG. 2, two types of objective lens groups 24W and 24M having a predetermined viewing angle are provided at the distal end portion 22 of the endoscope insertion section 21. For example, the wide-angle side objective lens group 24W has a viewing angle of 120 °, and the enlargement side objective lens group 24M has a viewing angle of 40 °.

The CCDs 23W and 23M for arranging and fixing cover glasses 25W and 25M on the light receiving surface are arranged at the image forming positions of the objective lens groups 24W and 24M. The reticle 10 similar to that of the first embodiment is deposited on the surface of the cover glass 25W, and the surface on which the reticle 10 is deposited is opposed to the light receiving portion of the CCD 23W.

Further, the cover glass 25W on the wide-angle side is
The reticle 10 is fixed to the CCD 23W in a state where the center of the reticle 10 is set to coincide with the center of the observation image on the enlarged side.

The light guide 27 is provided in the insertion portion 21.
As in the first embodiment, the illumination light from the light source device is guided to the distal end portion 22 of the insertion section 21 to illuminate the affected part.

The CCDs 23W and 23M are connected to the respective CCs.
CCU that processes image signals captured by D23W and 23M
28, and the CCU 28 is connected to the monitor 17 for displaying an observation image.

In the monitor 17, each CCD 23W, 2
Two observation images of 3M are set to be displayed side by side, and the size of the observation image can be changed and displayed as needed.

Although the enlarged image is displayed on the left side of the screen on the monitor 17 shown in FIG. 7 and the wide-angle image is displayed on the right side of the screen after being reduced, the relationship of the screen size is replaced. Is also possible.

At this time, as in the first embodiment, the reticle 10 is displayed in the wide-angle image, and the center position (intersection) is set so as to indicate the center of the visual field of the enlarged image.

(Operation) In such a configuration, the reticle 10 deposited on the cover glass 25W is displayed on the wide-angle image displayed on the monitor 17. At the same time, the monitor 17
An enlarged image centered on the field of view at the center position (intersection) of the reticle 10 displayed in the wide-angle image is displayed.

When guiding the endoscope insertion portion 21 to the observation target site, the wide-angle screen is displayed on the monitor 17 in an enlarged manner for operation, and when diagnosing the diseased part, the enlarged image is enlarged and observed.

As described above, in this embodiment, the monitor 1
Since the two screens displayed on the screen 7 can be selectively enlarged as needed, operability and diagnostic efficiency are improved.

(Fifth Embodiment) FIGS. 8 and 9 relate to a fifth embodiment of the present invention. FIG. 8 is an explanatory view of a cover glass disposed on a wide-angle CCD, and FIG. 9 is an endoscope image. FIG. This embodiment is an improvement of the electronic endoscope shown in the fourth embodiment.

As shown in FIG. 8, the CCD 23W on the wide-angle side
A mask 31 having projections 31a at four locations is vapor-deposited on the surface of the cover glass 30 disposed on the light receiving surface of the CCD 23W, and the cover glass is arranged such that the light receiving surface of the CCD 23W faces the surface on which the mask 31 is vapor-deposited. 30 is arranged.

The projection 31a provided on the mask 31
On the mask 31 seen when observing the wide-angle image, at the intersection connecting the convex portions 31a facing the opposite sides,
The center position of the enlarged image is set. In addition,
The line connecting the opposing convex portions 31a illustrated in FIG. 9 is a virtual line and is not displayed on the image.

(Operation) In such a configuration, the image deposited on the cover glass 30 as shown in FIG.
The mask 31 including the three convex portions 31a is displayed.

When the wide-angle screen is enlarged, an enlarged image centered on the virtual intersection of the four projections 31a is displayed on the monitor.

As described above, in the present embodiment, since an index such as a reticle or a frame is not displayed on the wide-angle screen, a clear endoscope image can be obtained without obstructing the observation field of view.

(Sixth Embodiment) FIGS. 10 and 11 relate to a sixth embodiment of the present invention, and FIG. 10 (a) shows a case where a visual field display correction adapter is attached to a distal end portion of an endoscope insertion portion. 11 (b) is a right side sectional view of FIG. 11 (a), and FIG.
FIG. 3 is an explanatory diagram showing an endoscope image.

In this embodiment, when the distance from the subject to the objective lens provided in the endoscope insertion section 33 changes, the center position of the enlarged image displayed in the wide-angle image and the enlarged position actually displayed are displayed. An adjustment mechanism is provided to correct the deviation from the center of the image.

That is, the distal end portion 34 of the endoscope insertion portion 33
The display plate 38 is provided on the field-of-view display correction adapter 32 mounted on the display plate 38, and the reticle 10 is deposited on the display plate 38. Note that the index is not limited to the reticle 10 and may be a frame indicating an enlarged visual field range.

The endoscope 33 shown in the present embodiment may be either the optical fiber endoscope shown in the first embodiment or the electronic endoscope shown in the fourth embodiment.
In this case, it is not necessary to deposit a reticle on a cover glass provided at the end of the image guide provided on the optical fiber endoscope or a cover glass facing the CCD provided on the electronic endoscope.

As shown in FIG. 10, the field-of-view display correction adapter 32 has an opening 36 for mounting the distal end portion 34 of the endoscope insertion portion 33 at one end of a tubular adapter body 35. A positioning step portion 36a that is in contact with the tip portion 34 when the tip portion 34 is fitted is formed behind the opening portion 36.

At the other end of the adapter body 35, a disc-shaped display plate 38 is provided so as to be sandwiched in the thickness direction of the cylindrical member. The display panel 38 is made of a transparent material such as glass, and a reticle 10 is deposited at the center of the display panel 38.

Further, four cross-shaped crossings around the display plate 38 are held by adjusting screws 39 screwed into the adapter body 35 from the outer peripheral direction.

The display plate 38 is slidably engaged in a direction perpendicular to the center axis of the adapter body 35, and the position of the reticle 10 is adjusted by appropriately moving the adjusting screws 39. It can be adjusted and fixed with respect to the central axis of 35.

When the visual field display correction adapter 32 is attached and fixed to the distal end portion 34 of the endoscope insertion portion 33, the distance X from the distal end surface of the distal end portion 34 to the display plate 38 is to magnify and observe the affected part. In this case, the distance to the subject is assumed.

Further, as shown in FIG.
The wide-angle image (left side in the drawing) displayed on the monitor 1
An adjustment knob (not shown) provided at 7 displays a parallel line 40 that can be adjusted vertically and a vertical line 41 that can be adjusted horizontally.

(Operation) In such a configuration, before performing the inspection using the endoscope, the distance interval X closest to the observation condition is required.
The field-of-view display correction adapter 32 is
Attach to 4.

Next, while observing the enlarged image (right side in the drawing) displayed on the monitor 17, the adjusting plate 39 is operated so that the reticle 10 is positioned at the center of the enlarged image, and the display plate 38 is moved to the adapter main body. 35 in a direction orthogonal to the central axis.

After the reticle 10 is set at the center of the enlarged image on the monitor 17, the adjustment knob (not shown) provided on the monitor 17 is operated to operate the wide angle image projected on the monitor 17. The parallel line 40 and the vertical line 41 displayed on the image (left side in the drawing) are moved, and the two lines 40 and 41 are made to coincide with the reticle 10 displayed on the wide-angle image.

After this adjustment is completed in a predetermined manner, the visual field display correction adapter 32 is removed from the distal end portion 34 of the endoscope insertion portion 33.

As a result, even when the distance from the subject to the objective lens changes, the center of the enlarged image displayed on the right side of the monitor 17 and the wide-angle image on the left side of the monitor 17 are displayed. The intersection of the lines 40 and 41 is matched.

As described above, according to the present embodiment, when observing a close or distant view according to the application and the observation site,
Since the display of the position of the enlarged image on the wide-angle image can be corrected to an appropriate position each time, the positional relationship between the two images can be accurately grasped.

When another endoscope having a different objective optical system (having a different focal length) is used, it is possible to adjust the display of the enlarged image position suitable for each endoscope.

(Seventh Embodiment) FIGS. 12 and 13 relate to a seventh embodiment of the present invention. FIG. 12 is an explanatory diagram showing the configuration of the endoscope end portion, and FIG. 13 shows an endoscope image. FIG.

As shown in FIG. 12, the endoscope according to the present embodiment is disposed at the axial direction of the insertion portion 42 (the straight-forward direction at the time of insertion) and the distal end portion 43 of the insertion portion 42. This is a so-called perspective endoscope in which the direction of the field of view of the objective lens groups 44W and 44M is not parallel.

This type of oblique endoscope is suitable for observing the wall surface of a relatively thin luminal organ. However, since this observation image is in a visual field direction different from the traveling axis direction of the insertion section 42. In addition, the direction may be lost when inserting or removing.

For this reason, in the present embodiment, an index indicating the straight traveling direction is provided in the observation visual field so that the insertion or removal direction can be recognized.

The objective lens group 44W of this oblique type endoscope
Has a wide viewing angle of 120 °, for example.
The objective lens group 44M is set so that, for example, the viewing angle is enlarged by 40 °.

At the rear end of each of the objective lens groups 44W, 44M, CCDs 45W, 45M similar to those of the fourth embodiment are arranged. On the front surface of the CCD 45W on the wide-angle side, a cover glass 46W on which a mask 31 having four convex portions 31a is deposited is disposed as in the fifth embodiment.

The projections 31a are arranged such that the intersections connecting the opposing projections 31a point in the direction of the central axis of the insertion section 42. Further, a reticle 10 indicating an enlarged visual field position by the objective lens 44M is provided on the cover glass 46W.
Has also been deposited.

That is, as shown in FIG. 13, a wide-angle image picked up by an endoscope includes a reticle 10 indicating an enlarged visual field position.
And a projection 31a indicating the straight traveling direction of the insertion portion are displayed.

The line connecting the convex portions 31a facing each other shown in FIG. 13 is a virtual line and is not displayed on the image.

(Operation) In such a configuration, when the endoscope insertion section 42 is inserted into or removed from the patient, the operation is performed while observing the wide-angle image. At this time, the operation is displayed on the wide-angle image. The traveling direction of the insertion section 42 is recognized using an intersection point connecting the opposing convex sections 31a of the convex section 31a as an index.

As a result, even in the case of a perspective endoscope whose viewing direction is different from the traveling direction of the insertion section 42, the insertion or removal can be reliably performed in a short time without losing the direction at the time of insertion or removal. Can be.

Further, even when a plurality of CCDs or the like are built in the distal end portion 43 of the insertion portion 42, the CCDs can be shifted not in the radial direction of the insertion portion but in the axial direction. As a result, the outer diameter of the insertion portion can be reduced, and the insertability is further improved.

(Eighth Embodiment) FIGS. 14 and 15 relate to an eighth embodiment of the present invention, and FIG. 14 is a front view of an endoscope end portion corresponding to the arrow XIV in FIG. FIG. 3 is an explanatory diagram showing an endoscope image. Note that the endoscope described in this embodiment has substantially the same structure as the perspective endoscope described in the seventh embodiment.

In the structure different from that of the seventh embodiment, the mask 31 in the wide-angle image is not provided with the projection 31a.
Instead, a light guide fiber 50 is provided in the endoscope insertion section 42.

The light guide fiber 50 is arranged so as to emit laser light from the tip of the insertion section 42 toward the axial direction of the insertion section 42.

(Operation) In such a configuration, when the operator performs an endoscope operation while observing the wide-angle image projected on the monitor 17, the laser beam 51 is spot-irradiated as necessary, and the insertion section is inserted. The traveling direction of 42 is confirmed.

In the present embodiment, the enlarged visual field position is displayed on the reticle 10 within the wide-angle visual field, and the traveling direction of the insertion section 42 is indicated by the laser light 51. However, the reticle 10 may interfere with the observation. In such a case, as described in the seventh embodiment, the mask 31 may be provided with the convex portions 31a, and the virtual intersection points connecting the opposing convex portions 31a may be used to confirm the center position of the enlarged visual field.

[Appendix] As described above, according to the present invention, the following configuration can be obtained. ◎.

[Appendix 1] An endoscope provided with an objective optical system is provided with an index indicating a specific visual field direction in an observation visual field in an endoscope provided with an objective optical system at a distal end of an insertion portion insertable into a subject. Endoscope.

[Additional Item 2] In an endoscope provided with a plurality of objective optical systems having different angles of view at the distal end of an insertion portion that can be inserted into a subject, the observation field of view on the wide angle side and the observation field on the enlargement side are included. An endoscope provided with an index indicating a direction.

[Additional Item 3] The endoscope according to Additional Item 2, wherein the index is a reticle displayed in an observation visual field.

[Appendix 4] The endoscope according to Appendix 2, wherein the index is spot irradiation by a laser beam.

[Additional Item 5] The endoscope according to Additional Item 2, wherein the index is a frame display indicating the entire visual field region on the enlarged side.

[Additional Item 6] The endoscope according to Additional Item 2, wherein the index is a convex portion provided around a mask constituting an observation field frame.

[Additional Item 7] In an endoscope provided with an insertion portion that can be inserted into a subject, an objective optical system is arranged on a plane that is not perpendicular to the center axis of the insertion portion, and the objective optical system is used. An endoscope, wherein an index indicating a central axis direction of the insertion section is provided in an observation visual field.

In such a configuration, for a so-called oblique-type endoscope, an index indicating the direction in which the endoscope is inserted is provided in a wide-angle view so that the endoscope does not lose its direction when inserted or removed. The operability is greatly improved.

On the other hand, conventionally, an endoscope having a so-called oblique type optical system in which the observation visual field direction of the objective optical system provided in the endoscope is not perpendicular to the axial direction of the insertion section. In this case, since the rectilinear direction of the insertion section is different from the viewing field direction, the center position of the endoscope image does not match the rectilinear direction of the insertion section, and it is difficult to determine the direction in which the insertion section should proceed. there were.

[Additional Item 8] The endoscope according to Additional Item 7, wherein the index is spot irradiation by a laser beam.

[Additional Item 9] The endoscope according to Additional Item 7, wherein the index is a convex portion provided around a mask constituting an observation field frame.

[0111]

As described above, according to the present invention,
When operating the endoscope while observing the wide-angle image,
Since an index indicating the position of the field of view on the enlarged side is displayed in the observation field of view of the endoscope, both the wide-angle image and the enlarged image can be obtained even when the endoscope is operated while observing the wide-angle image. Can be easily recognized, and the lesion diagnosis can be performed more reliably.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an endoscope according to a first embodiment.

FIG. 2 is an explanatory view of a cover glass disposed at the end of the image guide on the wide-angle side.

FIG. 3 is an explanatory diagram showing an endoscope image displayed on the monitor.

FIG. 4 is an explanatory diagram of a cover glass disposed at an end of a wide-angle image guide according to a second embodiment.

FIG. 5 is an explanatory diagram showing an endoscope image displayed on the monitor.

FIG. 6 is an explanatory diagram showing an endoscope image according to a third embodiment.

FIG. 7 is an explanatory diagram showing an entire configuration of an endoscope according to a fourth embodiment.

FIG. 8 is an explanatory diagram of a cover glass arranged on a wide-angle side CCD according to a fifth embodiment.

FIG. 9 is an explanatory view showing an endoscope image.

FIG. 10 is an explanatory diagram when a visual field display correction adapter according to a sixth embodiment is attached to a distal end portion of an endoscope insertion portion.

FIG. 11 is an explanatory view showing an endoscopic image of the same.

FIG. 12 is an explanatory diagram showing a configuration of an endoscope distal end portion according to a seventh embodiment.

FIG. 13 is an explanatory view showing an endoscope image of the same.

FIG. 14 shows the XIV of FIG. 12 according to the eighth embodiment of the present invention.
Front view of endoscope end portion corresponding to arrow view

FIG. 15 is an explanatory diagram showing an endoscope image.

[Explanation of symbols]

Reference Signs List 1 endoscope 2, 33, 21, 42 insertion section 8W, 8M, 24W, 24M, 44W, 44M objective lens group (objective optical system) 9, 22, 34, 43 tip 10 reticle (index) 19 frame (index) ) 31a convex part (index)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Takikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Adult Adult 2-34-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Kunihide Kaji, Inventor 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. Tomoya Kitano 2-43-2, Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Kogyo Co., Ltd. (72) Inventor Ichiro Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Tokyo Olympus Optical Co., Ltd. (72) Kazutaka Matsumoto 2-43-2, Hatagaya Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. F-term (reference) 2H040 AA03 BA00 BA02 BA03 CA13 CA22 CA27 DA12 DA13 DA52 GA02 GA11 4C 061 AA00 BB01 CC06 DD03 FF03 LL01 NN05 RR06 WW03 WW10 WW13

Claims (1)

[Claims] 1. An endoscope provided with an objective optical system capable of at least switching between wide-angle and magnified observation at a distal end of an insertion portion to be inserted into a body cavity for observing an observation target site, wherein a wide-angle observation field of view An endoscope, wherein an index indicating a visual field position on an enlargement side is provided in the inside.