JP2001275953A - Multiview endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a multiview endoscope capable of observing a wide angle visual field and a magnification variable magnified visual field at the same time. SOLUTION: First and second optical channels are formed to the endoscope and a wide angle observation optical system for observing the wide angle visual field of an intracoelomic object to be observed is provided to the first optical channel and a magnifying advance/retreat observation optical system capable of advancing and retreating in order to change the distance with the intracoelomic object to be observed and magnifying a part of the observation range due to the wide angle observation optical system to observe the same is provided to the second optical channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-view endoscope capable of observing a wide-angle view and an enlarged view (a narrow view within a wide-angle view).

[0002]

2. Description of the Related Art Endoscopes capable of observing a wide-angle field of view and an enlarged field of view are known, for example, from Japanese Utility Model Laid-Open No. 1-120155 and Japanese Utility Model Laid-Open No. 54-31390. However, these are fixed in both the wide-angle field of view and the expanded field of view, and in order for the operator to change the range, the entire body insertion section must be moved in the body cavity to change the distance to the observation object.

Japanese Patent Application Laid-Open No. 8-332169 proposes a device for moving an enlarged observation range around a target within a wide-angle field of view in accordance with the movement of the target.
This is based on the idea that the observation range is changed by moving the imaging element within a fixed (wide-angle) visual field, and the operator cannot arbitrarily enlarge a part of the wide-angle visual field for observation.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-view endoscope capable of observing a wide-angle field of view and an enlarged field of view, and capable of observing a part of the wide-angle field of view at an arbitrary magnification. And

[0005]

SUMMARY OF THE INVENTION A multi-view endoscope according to the present invention forms a first optical channel and a second optical channel on an endoscope, and observes a wide-angle field of view of an object in a body cavity on the first optical channel. In addition to providing a wide-angle observation optical system, the second optical channel can be moved forward and backward to change the distance to the object in the body cavity, and a part of the observation range by the wide-angle observation optical system is enlarged and observed. It is characterized by providing an enlargement / retreat observation optical system.

When the enlargement / retraction observation optical system is constituted by a rigid endoscope, it is desirable that the second optical channel be rotatable around the axis of the channel. At this time,
If the enlargement / retraction observation optical system is of a perspective type, the observation range can be changed. The enlargement / retraction observation optical system can also be constituted by a flexible mirror whose projection from the second optical channel can be curvedly scanned.

It is preferable that the magnifying optical system is provided with a zoom mechanism for changing the focal length. It is preferable that each of the wide-angle observation optical system and the enlargement / retraction observation optical system includes a focus mechanism for adjusting a focal position.

[0008]

1 to 9 show a first embodiment in which a multi-view endoscope according to the present invention is applied to a rigid endoscope. The rigid endoscope 10 has a straight insertion part 11 in the body, and first and second optical channels 12 and 13 are formed in the insertion part 11 in the body. The first optical channel 12 includes a straight cylindrical portion 12 a and a right-angle bent cylindrical portion 1.
2b and a straight tubular portion 12 parallel to the straight tubular portion 12a
c, and has a crank shape as a whole.
On the other hand, the second optical channel 13 has a straight cylindrical portion 13a parallel to the straight cylindrical portion 12a,
The rear end is open at the operation unit 14 (FIG. 2).

[0009] The straight cylindrical portion 12 of the first optical channel 12
A negative lens 15a and a positive lens 15b constituting the wide-angle objective lens 15 and a relay lens group 16 including a plurality (four in the illustrated example) of the same relay lens 16a are fixed to the a in order from the front end thereof. ing. A first mirror 17 and a second mirror 18, which are parallel to each other and form a 45 ° angle with each other, are fixed to the connection between the right-angle bent cylinder 12b and the straight cylinders 12a, 12c. A focus lens (imaging lens) 19 is provided in the cylindrical portion 12c.
And the wide-angle field-of-view CCD 20.

The components from the wide-angle objective lens 15 to the wide-angle field of view CCD 20 constitute a wide-angle observation optical system W. FIG. 8 is a detailed view of the wide-angle observation optical system W. The image of the observation unit in the body cavity by the wide-angle objective lens 15 is formed on the image plane 15.
i, and the wide-angle field-of-view image on the image forming surface 15i is sequentially formed on the respective image forming surfaces 16a 'by the respective relay lenses 16a of the relay lens group 16 and transmitted. Re-image at 16i. Then, the image on the relay lens group image forming surface 16i passes through the optical path bent by the first mirror 17 and the second mirror 18, and finally forms an image on the wide-angle visual field CCD 20 via the focus lens 19. .

The straight cylindrical portion 13 of the second optical channel 13
A magnifying forward / backward observation optical system unit (secondary rigid endoscope, hereinafter, forward / backward optical system unit) 30 is inserted in a so as to be able to advance and retreat. The advancing / retreating optical system unit 30 includes a linear tubular portion 31 slidably fitted in the linear tubular portion 13a of the second optical channel 13, and an operating portion 32 provided at a rear end of the linear tubular portion 31. And a rectilinear rack sleeve 33 fitted to the end of the linear tubular portion 31 on the operation portion 32 side. Straight cylindrical part 3
1 includes a side-viewing type objective lens 34 composed of a negative lens 34a, a viewing direction conversion prism 34b, and a positive lens 34c, and a plurality (four groups in the illustrated example) of the same relay lens 35a in order from the tip. The relay lens group 35 is fixed. The first lens group 36a, the second lens group 36b, and the third lens group 36c are provided in the operation unit 32.
And a CCD 37 for an enlarged visual field.

The elements from the side-viewing type objective lens 34 to the CCD 37 for the enlarged visual field constitute an enlarged / retracted observation optical system T. FIG. 9 is a detailed view of the magnification advance / retreat observation optical system T. The image of the observation section in the body cavity by the side-view type objective lens 34 is formed on the image plane 34i, and the wide-angle field image on the image plane 34i is , Each relay lens 35a of the relay lens group 35
, The images are sequentially formed and transmitted on the respective image forming surfaces 35a ', and are re-imaged on the relay lens group image forming surface 35i. Then, the image on the relay lens group image forming surface 35i is finally formed on the enlarged visual field CCD 37 via the zoom lens 36. As shown in FIG. 1, the visual field range of the observation object in the body cavity by the expansion / retraction observation optical system T is a part of the visual field range of the observation section in the body cavity by the wide-angle observation optical system W, and The magnification is larger than the image.

The rectilinear rack sleeve 33 has, on its outer surface, a rack 33a extending in a direction parallel to the axis and a detent projection 33b projecting in the radial direction. The operating portion 14 of the rigid endoscope 10 is formed with a rectilinear guide groove 14a for engaging the rotation preventing protrusion 33b so as to be able to advance and retreat, and guiding the rectilinear rack sleeve 33 so as to be movable only in the axial direction. A pinion 14b that meshes with the rack 33a and a rotation operation knob 14c are formed on the operation unit 14. By rotating the rotation operation knob 14c in the forward and reverse directions, the straight-moving rack sleeve 33 moves forward and backward in the axial direction. I do.
A fixing screw 3 for fixing the straight-moving rack sleeve 33 after fitting the straight-moving rack sleeve 33 to the linear tubular portion 31 is attached to the straight-moving rack sleeve 33.
When the fixing screw 33c is tightened, the rectilinear rack sleeve 33 and the linear cylindrical portion 31 are integrated, and when the fixing screw 33c is loosened, the rectilinear rack sleeve 33 and the linear cylindrical portion 3 are integrated.
The relative movement (straight movement and rotation) of 1 is free. An O-ring 14 d (FIG. 5) is provided on the inner peripheral surface of the second optical channel 13 so as to maintain the gap with the linear cylindrical portion 31 in a liquid-tight manner and to provide resistance to the relative movement of the linear cylindrical portion 31. ing.

The focus lens 19 of the wide-angle observation optical system W supported in the first optical channel 12 advances and retreats in the optical axis direction by rotating the focus adjustment ring 19a in the forward and reverse directions. As shown in FIG. 5, a radial pin 19c that projects in the radial direction is fixed to a lens frame 19b to which the focus lens 19 is fixed.
Is a cam groove 19e of a cam ring 19e fixed to a frame 19d forming the first optical channel 12 (linear cylindrical portion 12c).
f, and through a play hole 19g formed in the frame 19d, it is fitted in a rotation transmission groove 19h parallel to the axis formed on the inner surface of the focus adjustment ring 19a. Accordingly, when the focus adjustment ring 19a is rotated, the lens frame 19b (focus lens 19) rotates via the radial pin 19c, and at the same time, the lens frame 19b (focus lens 19) moves in the optical axis direction according to the shape of the cam groove 19f. To go back and forth.

First lens group 36a, second lens group 36b
And the zoom lens 36 including the third lens group 36c,
The first lens group 36a is a focus lens group, and the second lens group 36b and the third lens group 36c are variable power lens groups.
The operation unit 32 includes a focus adjustment mechanism 38 for moving the first lens group 36a back and forth in the optical axis direction, and a zoom mechanism 39 for moving the second lens group 36b and the third lens group 36c back and forth in the optical axis direction with a predetermined locus. Supported.

The focus adjustment mechanism 38 is the same mechanism as the mechanism for moving the focus lens 19 forward and backward, and projects radially from the focus adjustment ring 38a, the lens frame 38b to which the first lens group 36a is fixed, and the lens frame 38b. Ring 38c, cam ring 38 fixed to frame 38d
e, a play hole 38 formed in the cam groove 38f and the frame 38d.
g, a rotation transmission groove 38h formed in the inner surface of the focus adjustment ring 38a and parallel to the axis. Therefore, when the focus adjustment ring 38a is rotated, the lens frame 38b (the first lens group 36a) is rotated via the radial pin 38c,
At the same time, according to the shape of the cam groove 38f, the lens frame 38b
The (first lens group 36a) advances and retreats in the optical axis direction.

The zoom mechanism 39 provides independent movement in the direction of the optical axis to the second lens group 36b and the third lens group 36c, and a lens frame 39 to which the second lens group 36b is fixed.
b 'and a lens frame 39b "in which the third lens group 36c is fixed.
And the cam ring 39e has two cam grooves 39f 'and 39c ".
Except that f ″ is formed (see FIG. 6), the basic structure is the same as the focus adjustment mechanism 38. That is, similarly to the focus adjustment mechanism 38, the zoom ring 39a and the frame 3 are formed.
It has a play hole 39g formed in 8d and a rotation transmission groove 39h formed in the inner surface of the zoom ring 39a and parallel to the axis. Therefore, when the zoom ring 39a is rotated, the lens frame 39b 'is moved via the radial pins 39c' and 39c ".
(The second lens group 36b) and the lens frame 39b ″ (the third lens group 36c) rotate, and at the same time, the cam grooves 39f ′ and 39f
According to the shape of f ″, the lens frame 39b ′ (second lens group 36b) and the lens frame 39b ″ (third lens group 36c) advance and retreat in the optical axis direction, and the focal length of the zoom lens 36 changes. More specifically, the zooming action is performed by the movement of the second lens group 36b, and the focus movement accompanying the zooming is compensated by the movement of the third lens group 36c.

The CCD 20 of the wide-angle observation optical system W and the CCD 37 of the enlargement / retraction observation optical system T are connected to the signal cable 2 respectively.
0b and 37b, the image processing circuits 20a and 37a
(FIG. 7), and further connected to a monitor 40. FIG. 17 shows an example of an image on the monitor 40. The wide-angle field of view 40 by the wide-angle CCD 20 and the image processing circuit 20a is shown in FIG.
Within w, an enlarged visual field 40t by the enlarged visual field CCD 37 and the image processing circuit 37a is shown.

A light guide 41 is connected to the operation unit 14 of the rigid endoscope 10. One end (front end) of the light guide 41 faces the illumination window 41a at the distal end of the body insertion portion 11, and the other end (rear end) faces the light source.
Such lighting devices are well known.

The present endoscope having the above configuration is used, for example, as follows. With the advance / retreat optical system unit 30 set in the second optical channel 13 as shown in FIG. 1, the body insertion section 11 is inserted into the body cavity. Then, under illumination by the light guide 41, an image of the observation object in the body cavity by the wide-angle observation optical system W is formed on the CCD 20 for wide-angle view, and the image observed by the enlargement / retreat observation optical system T is converted to the CCD 3 for enlargement view.
7 is imaged. Focus adjustment of the wide-angle observation optical system W
The focus adjustment ring 19a is rotated, and the focus adjustment of the enlargement / retraction observation optical system T is performed by rotating the focus adjustment ring 38a. The enlargement / retreat observation optical system T is a side-view type that observes the side of the axis of the advance / retreat optical system unit 30 and uses a part of the observation field of the wide-angle observation optical system W as an observation area. In the monitor image at this time, for example, as shown in FIG. 17, the enlarged field of view 40t is shown in the wide-angle field of view 40w, so that the operator can observe a partial area in the wide-angle field of view 40w as the enlarged field of view 40t. it can.

In the above observation state, the operator views the enlarged visual field 4.
To enlarge a part of the image within 0t, or to obtain a wider field of view as the enlarged field of view 40t, the rotary operation knob 14
The advancing / retreating optical system unit 30 is advanced or retracted via the line c, and the distance between the side-viewing type objective lens 34 at the distal end thereof and the object in the body cavity is changed. That is, when the pinion 14b is rotated via the rotation operation knob 14c, the advance / retreat optical system unit 30 advances / retreats in the axial direction via the rack 33a. The closer the side-viewing type objective lens 34 is to the object to be observed in the body cavity, the more the narrower range is enlarged. Also, instead of moving the reciprocating optical system unit 30 forward or backward (or in addition), the zoom ring 39a of the zoom mechanism 39 is rotated to change the focal length of the magnifying reciprocation observation optical system T. Can be scaled.
Focus adjustment to the enlarged view CCD 37 is performed by a focus adjustment mechanism 38.

A wide-angle field of view 40 is used as the enlarged field of view 40t.
When you want to observe another part in w,
And the optical system unit 30 is rotated within the straight rack sleeve 33. Since the side-view type objective lens 34 of the advancing / retreating optical system unit 30 is a perspective type, the enlarged visual field 40t is located at an eccentric position in the wide-angle visual field 40w as shown in FIG. Then, when the advance / retreat optical system unit 30 is rotated about its axis, the visual field center 40c of the enlarged visual field 40t is obtained.
Moves on the circle 40x within the wide-angle visual field 40w, so that different positions within the enlarged visual field 40t can be magnified and observed. Image processing circuit 37a of CCD 37 for enlarged visual field
It is preferable to provide an image rotation control circuit for controlling the rotation of the image in accordance with the amount of rotation of the advance / retreat optical system unit 30 so that the enlarged visual field 40t does not rotate within the wide-angle visual field 40w.

FIGS. 10 to 12 show a second embodiment of the endoscope according to the present invention. In this embodiment,
The linear rack sleeve 33, the pinion 14b, and the rotary operation knob 14c of the first embodiment are omitted for simplification. In this embodiment, the reciprocating operation of the reciprocating optical system unit 30 in the axial direction is performed by directly pushing and pulling the reciprocating optical system unit 30 without using the rack and pinion. The operation unit 14 is provided with a fixing screw 14f for fixing the advance / retreat optical system unit 30 to the operation unit 14, and the other configuration is the same as that of the first embodiment.

FIGS. 13 and 14 show a third embodiment of the endoscope according to the present invention. This embodiment is an embodiment in which a flexible mirror 50 is inserted into the second optical channel 13 of the body insertion section 11 instead of the advance / retreat optical system unit 30 of the first embodiment. The flexible mirror 50 has a curved portion 52 at the front end of the tubular portion 51 and a bending operation portion 53 at the rear end. On the outer periphery of the cylindrical portion 51, a rack sleeve 3 for linear movement is provided.
3 is fitted and fixed with fixing screws 33c.

The bending section 52 can be bent in two orthogonal directions by two bending operation knobs 54 and 55 provided on the bending operation section 53. Such a bending operation structure of a flexible endoscope is well known. The flexible mirror 50 has an objective lens 52 at the distal end.
a is located, and image information captured by the objective lens 52a is provided to the monitor 40 via the image processing circuit 37a. The wide-angle observation optical system W on the first optical channel 12 side includes:
This is the same as the first and second embodiments, and the flexible mirror 50 of the present embodiment constitutes an expansion / retraction observation optical system T having a narrower viewing range (angle) than the wide-angle observation optical system W. The flexible mirror 50 includes well-known elements such as an illumination system, an air / water supply system, a forceps channel, and the like, similarly to a normal flexible mirror.

In this embodiment, by rotating the rotary operation knob 14c of the operation section 14, the flexible mirror 50 is moved forward and backward, and the distance between the objective lens 52a at the tip of the bending section 52 and the observation section in the body cavity is changed. By rotating the bending operation knobs 54 and 55, the direction of the bending portion 52 can be changed. In this embodiment, the bending portion 52
Since the direction of the (objective lens) can be changed more freely than in the first and second embodiments, the degree of freedom in selecting the magnification observation position is high. The flexible mirror 50 can also incorporate a zoom mechanism that changes the focal length in accordance with the distance between the distal end of the bending portion 52 and the body cavity observation unit.

FIG. 15 shows a fourth embodiment of the endoscope according to the present invention. In this embodiment, the reciprocating optical system unit 3
This is an embodiment in which the axial movement and the rotation of 0 are powered. The rigid endoscope 10 has a drive box 14P
The drive box 14P houses an axial movement motor 61 and a rotation motor 62.
On the other hand, the linear cylindrical portion 31 of the advance / retreat optical system unit 30 inserted into the second optical channel 13 of the body insertion portion 11 is guided into the drive box 14P, and has a cylindrical rack 63 and teeth on its outer periphery. The thick gear 64 is fixed. The cylindrical rack 63 has a rack on the entire circumference in the circumferential direction, and has a pinion 65 that is rotationally driven by an axial movement motor 61.
, And the tooth thickness gear 64 meshes with a drive gear 66 that is driven to rotate by the rotation motor 62. The axial movement motor 61 and the rotation motor 62 are connected to an axial motor control circuit 67 and a rotation motor control circuit 68, respectively. Both control circuits 67 and 68 are connected to operation switches (for example, foot switches) 67s and 68s. ing.

The rear end of the linear cylindrical portion 31 is connected to the operating portion 32 so as to be rotatable relative to the axis of the linear cylindrical portion 31. That is, an outer flange 31f is formed at the rear end of the linear tubular portion 31, and an annular recess 32b is formed in the outer frame 32a of the operating portion 32 to rotatably support the outer flange 31f. Have been. The control box 14 </ b> P and the outer frame 32 a engage with each other to prevent the relative rotation between the drive box 14 </ b> P and the operation unit 32.
e and 32c are formed. Other configurations are the same as those of the first embodiment.

Therefore, in this embodiment, the operation switch 6
When the axial movement motor 61 is rotated in the normal or reverse direction via the 7s and the axial motor control circuit 67, the linear tubular portion 31 (the advance / retreat optical system unit 30) is moved in the axial direction via the pinion 65 and the tubular rack 63. When the rotary motor 62 is rotated forward and reverse through the operation switch 68s and the rotary motor control circuit 68, the linear tubular portion 31 rotates through the drive gear 66 and the gear gear 64. The cylindrical rack 63 always meshes with the pinion 65 irrespective of the rotational position about the axis thereof, and the tooth thickness gear 64 has an axial length that maintains the meshing with the drive gear 66 in the entire moving range of the unit 30. Have. Therefore, the same operation as in the first embodiment can be obtained not manually but electrically.

In this embodiment, the straight cylindrical portion 31
Rotation occurs with respect to the fixed drive box 14P and the operation unit 32, and the operation unit 32 (the CCD for the expanded visual field in the operation box 32P).
37) does not rotate, so even if the position of the enlarged visual field 40t in the wide-angle visual field 40w is changed by rotating the linear tubular portion 31, the enlarged visual field 40t does not rotate in the monitor 40.

The focus adjustment mechanism of the wide-angle observation optical system W and the enlargement / retreat observation optical system T and the zoom mechanism of the enlargement / retreat observation optical system T shown in the above embodiment are merely examples. Various types of this kind of focus adjustment mechanism and zoom mechanism are known, and it goes without saying that the present invention is not limited to these specific structures. In addition, the side-view type forward / backward optical system unit 3
0 is a wide-angle view 4 by rotating about an axis.
Although there is an advantage that the observation position within 0w can be changed, a certain effect can be obtained even when the direct-view type is used.

Further, when the depth of the wide-angle observation optical system W and the enlargement / retreat observation optical system T is deep, or when the extension / retreat observation optical system T (the advance / retreat optical system unit 30) has a small advance / retreat distance,
Both optical systems or one of the optical systems may have a fixed focus. In addition, a wide-angle view 40w and an enlarged view 4
Although 0t is displayed on the same monitor 40, both may be displayed on different monitors.

[0033]

As described above, according to the present invention, when observing the inside of a body cavity, a wide-angle view and an enlarged view can be obtained at the same time, and the size of the image of the enlarged view within the wide-angle view can be varied. A multi-view endoscope can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment in which a multi-view endoscope according to the present invention is applied to a rigid endoscope.

FIG. 2 is a cross-sectional view showing a state in which a magnification advance / retreat observation optical system is removed from the rigid endoscope of FIG.

FIG. 3 is a cross-sectional view of the extracted expansion / retraction observation optical system.

FIG. 4 is a cross-sectional view showing a state in which a rectilinear sleeve has been removed from the magnification advance / retreat observation optical system.

FIG. 5 is an enlarged sectional view of a focus mechanism and a zoom mechanism of the rigid endoscope of FIG. 1;

FIG. 6 is a development view of a zoom mechanism part of FIG. 5;

FIG. 7 is a block diagram showing a signal processing system of the rigid endoscope in FIG. 1;

FIG. 8 is an optical diagram of a wide-angle observation system of the multi-view endoscope in FIG. 1;

FIG. 9 is an optical diagram of the enlargement / retraction observation optical system.

FIG. 10 is a sectional view of a main part showing a second embodiment in which the multi-view endoscope according to the present invention is applied to a rigid endoscope.

FIG. 11 is a cross-sectional view showing a state in which the magnification advance / retreat observation optical system is removed from the rigid endoscope of FIG. 10;

FIG. 12 is a cross-sectional view of the extracted expansion / retraction observation optical system.

FIG. 13 is a cross-sectional view showing an embodiment in which a magnifying advance / retreat observation optical system is a flexible endoscope in the multi-view endoscope of the present invention.

FIG. 14 is a front view showing an example of the operation unit side of the multi-view endoscope in FIG. 13;

FIG. 15 is a cross-sectional view of a main part showing an embodiment in which a rotation mechanism is added to the magnification advance / retreat observation optical system in the multi-view endoscope according to the present invention.

FIG. 16 is a conceptual diagram showing an example of movement of an enlarged field of view of a multi-view endoscope according to the present invention within a wide-angle field of view.

FIG. 17 is a conceptual diagram showing an example of a display with a wide-angle view and an enlarged view of the multi-view endoscope according to the present invention.

[Explanation of symbols]

 W Wide-angle observation optical system T Magnifying forward / backward observation optical system 10 Rigid endoscope 11 Internal insertion unit 12 First optical channel 13 Second optical channel 14 Operation unit 14P Drive box 15 Wide-angle objective lens 16 Relay lens group 17 18 Mirror 19 Focus lens 19a Focus Adjusting ring 20 Wide-angle field-of-view CCD 30 Enlargement / retraction observation optical system unit 31 Linear cylindrical part 32 Operation part 33 Straight-line rack sleeve 34 Side-view type objective lens 35 Relay lens group 36 Zoom lens 37 Magnification-field CCD 38 Focus adjustment mechanism 39 Zoom mechanism 40 Monitor 40w Wide-angle field of view 40t Enlarged field of view 41 Light guide 41a Illumination window 50 Flexible mirror 51 Tubular part 52 Curved part 53 Curved operating part 54 55 Curved operating knob 61 Axial moving motor 62 Rotating motor 63 Cylindrical rack 64 Teeth Gear 65 pinion 66 driving gear 67 axially motor control circuit 68 rotates the motor control circuit 67s 68s operated switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Sano 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Gaku Kogyo Co., Ltd. (72) Inventor Yoshiki Ito 2-36, Maenocho, Itabashi-ku, Tokyo 9 Asahi Kogaku Kogyo Co., Ltd. (72) Inventor Tsuneo Fukuyo 2-12-2 Hongo, Bunkyo-ku, Tokyo F-term in Shinko Koiki Manufacturing Co., Ltd. (Reference) 2H040 CA22 4C061 AA00 BB02 BB03 BB05 CC06 DD01 DD03 FF21 LL03 NN01 NN05 PP13 WW03 WW04 WW10 5C022 AA09 AB21 AB66 AC42 AC51 AC77

Claims (6)

[Claims] 1. A first optical channel and a second optical channel formed in an endoscope; a wide-angle observation optical system provided in the first optical channel for observing a wide-angle field of view of an object in a body cavity; In the second optical channel, provided to be able to advance and retreat to change the distance to the observation object in the body cavity,
A multi-view endoscope comprising: an expansion / retraction observation optical system for enlarging and observing a part of the observation range by the wide-angle observation optical system. 2. The multi-view endoscope according to claim 1, wherein the magnification advance / retreat observation optical system comprises a rigid endoscope, and is rotatable about an axis of the second optical channel in the second optical channel. Endoscope. 3. The multi-view endoscope according to claim 1, wherein the magnification advance / retreat observation optical system includes a zoom mechanism for changing a focal length. 4. The multi-view endoscope according to claim 1, wherein the wide-angle observation optical system and the enlargement / retraction observation optical system include a focus mechanism for adjusting a focal position. View endoscope. 5. The multi-view endoscope according to claim 1, wherein the enlargement / retraction observation optical system is a perspective type. 6. The multi-view endoscope according to claim 1, wherein the magnification advance / retreat observation optical system comprises a flexible mirror whose projection from the second optical channel is capable of curved scanning.