JP4789487B2 - Endoscope - Google Patents

Description

  The present invention relates to an electronic endoscope suitable for performing treatment using a treatment tool.

In recent years, electronic endoscopes equipped with solid-state imaging devices have been widely adopted in the medical field and the like. As an electronic endoscope of the first conventional example, for example, Japanese Patent Application Laid-Open No. 2003-230533 discloses a side view or a rear perspective view as a viewing direction.
In this first conventional example, there is no disclosure or suggestion regarding a channel (treatment instrument pipe line) through which a treatment instrument can be inserted or a raising base for raising the treatment instrument. Good operability cannot be realized.
For example, Japanese Patent Application Laid-Open No. 2004-72526 as a second conventional example discloses an electronic endoscope having a channel through which a treatment tool can be inserted and having a side view or a rear perspective view as a visual field direction. .
In the second conventional example, a wedge-shaped lens in which the upper viewing angle side is thicker than the lower viewing angle side is adopted as the most advanced lens in the objective optical system.
JP 2003-230533 A JP 2004-72526 A

In the second conventional example, a wedge-shaped lens in which the upper viewing angle side is thicker than the lower viewing angle side as the most advanced lens in the objective optical system, the upper viewing angle becomes wider. When the distal end side of the treatment instrument is placed in the observation visual field using the treatment instrument, an image of the treatment instrument that falls within the upper viewing angle is observed to be small.
In this way, in the conventional example, the upper half of the viewing angle is wider than the lower half of the viewing angle, and the upper magnification of the visual field is smaller than the lower magnification of the visual field. When a subject as an object is put in, it is displayed small.

(Object of invention)
The present invention has been made in view of the above-described points, and an object thereof is to provide an electronic endoscope that makes it easier to observe an observation object such as a treatment instrument that falls within the upper viewing angle.

The electronic endoscope of the present invention is inserted into a body cavity, and an insertion portion provided with a channel for inserting a treatment instrument;
A tip body provided at the tip of the insertion portion;
A raising device that is provided in the distal end main body and is arranged in the vicinity of the distal end opening of the channel and that changes the protruding direction of the treatment instrument protruding from the distal end opening;
A solid-state imaging device that is provided in the distal end body and captures an image in a body cavity as an endoscopic image; and a lateral direction that is provided in the distal end body and is substantially orthogonal to the longitudinal direction of the insertion portion; A first viewing angle for forming an upper half image on the endoscopic image and a second viewing angle for forming a lower half image; An objective optical system for imaging;
Viewing angle setting means for setting the first viewing angle equal to or less than the second viewing angle;
It is characterized by comprising.
With the above configuration, an observation object such as a treatment instrument that falls within the upper viewing angle can be more easily observed.

An electronic endoscope according to the present invention is provided in an insertion portion provided with a channel that is inserted into a body cavity and through which a treatment tool is inserted, a distal end portion main body provided at a distal end of the insertion portion, and the distal end portion main body. A raising device that is disposed in the vicinity of the distal end opening of the channel and that changes the protruding direction of the treatment tool that protrudes from the distal end opening; and is provided on the distal end main body, and takes an image inside the body cavity as an endoscopic image A solid-state imaging device that is provided on the distal end portion main body, and a first direction for forming an upper half image on the endoscopic image with a side direction substantially orthogonal to the longitudinal direction of the insertion portion as a visual field direction A viewing angle and a second viewing angle for forming an image of the lower half, an objective optical system that forms an image of a body cavity on the solid-state imaging device, and a field of view of the treatment tool with the raising device A part of the treatment instrument when raised to the upper side of the range Others be those to be displayed on the upper half of the image of the whole based on the first viewing angle, comprising a, and the viewing angle setting means for smaller than said second viewing angle the first viewing angle It is characterized by that.

  Embodiments of the present invention will be described below with reference to the drawings.

1 to 15 relate to a first embodiment of the present invention, FIG. 1 shows a configuration of an electronic endoscope system including the first embodiment of the present invention, and FIG. 2 shows a main part in an insertion portion of the electronic endoscope. 3A is a plan view showing the structure in the vicinity of the distal end portion viewed from the side (upper side) of the insertion portion in FIG. 2, and FIG. 3B is a treatment in FIG. FIG. 3 (C) shows the raising structure for raising the instrument raising base. FIG. 3 (C) is a sectional view taken along the line BB in FIG. 3 (A), and the treatment instrument raising base is raised by the raising mechanism in FIG. The state is shown.
4 shows a cross-sectional structure of the entire imaging apparatus, FIG. 5 shows a cross section taken along the line CC in FIG. 4, and FIGS. 6A, 6B, and 6B are taken along the line DD in FIG. FIG. 7 shows the structure of the objective optical system part in the imaging apparatus, FIG. 8 shows the structure of the frame of the solid-state imaging unit, and FIG. 9 shows the monitor. The displayed endoscopic image is shown.

10 shows the structure of the component surface (front surface) of the TAB tape, FIG. 11 shows the structure of the back surface of FIG. 10, and FIG. 12 shows a cross section taken along the line GG in a state where electronic components are mounted on the TAB tape of FIG. FIG. 13 shows a part of the imaging apparatus in the modified example, and FIG. 14 has compatibility so that the distal end side of the treatment instrument can be captured within the visual field range as in the case of the existing electronic endoscope. FIG. 15 is an explanatory diagram of the action on FIG. 14.
An electronic endoscope system 1 shown in FIG. 1 includes an electronic endoscope 2 that constitutes the first embodiment, a light source device 3 that supplies illumination light when the electronic endoscope 2 is connected, an electronic endoscope A video processor 5 that is connected to the endoscope 2 via a scope cable 4 and performs signal processing on an imaging device 26 (described later in FIG. 4) built in the electronic endoscope 2, and is connected to the video processor 5 And a monitor 6 for color-displaying a video signal input via a monitor cable on a display surface.

The electronic endoscope 2 includes an elongated and flexible insertion portion 7 that is inserted into a body cavity or the like, an operation portion 8 formed on the proximal end side of the insertion portion 7, and an extension from the operation portion 8. The extended universal cord portion 9 and a scope connector portion 10 provided at the end of the universal cord portion 9 and detachably connected to the light source device 3 are provided.
A contact connector portion 10a is provided on a side portion of the scope connector portion 10, and the other end of the scope cable 4 provided with the detachable electrical connector 4a on the contact connector portion 10a is detachably attached to the video processor 5 by the electrical connector 4b. Connected with.
The insertion portion 7 includes a distal end portion 11 provided with an imaging device 26 (which will be described later with reference to FIG. 2), a bendable bending portion 12 formed on the proximal end side of the distal end portion 11, and the bending portion 12. And a long flexible tube portion 13 extending from the proximal end side to the distal end side of the operation portion 8.

A switch portion 14 provided with a plurality of switches 14 a is provided on the top of the operation portion 8. Further, an air supply / water supply control unit 15 that performs air supply / water supply control and a suction control unit 16 that performs suction control are provided on the side surface of the operation unit 8. Further, the operation portion 8 is provided with a bending operation knob 17, and the bending portion 12 can be bent by gripping the grip portion 18 on the distal end side of the operation portion 8 and operating the bending operation knob 17.
Further, an air / water supply conduit (not shown) is inserted into the insertion portion 7, and this air / water supply conduit is connected to the air / water supply control portion 15 by the operation portion 8, and further inside the universal cord portion 9. Through the inserted air / water supply conduit, the end reaches the scope connector 10 and is connected to the air / water supply mechanism in the light source device 3.

Further, a treatment instrument pipe line (also referred to as a channel) 19 (refer to FIG. 3C) for performing treatment instrument insertion and suction inserted into the insertion section 7 is 2 near the front end of the operation section 8 on the rear side. One is in communication with the treatment instrument insertion port 19b, and the other is in communication with the suction conduit in the universal cord portion 9 via the suction control portion 16, and this suction conduit is not shown in the scope connector portion 10 (not shown). Leads to the suction cap.
The channel 19 communicates with a tip opening 19a that opens at the tip portion 11, and sucks body fluid and the like from the tip opening 19a during a suction operation. When a treatment instrument such as a forceps (cannula) is inserted from the treatment instrument insertion port 19b, the distal end side of the treatment instrument exits.
A light guide 20 (see FIG. 2) for transmitting illumination light is inserted into the insertion portion 7, the operation portion 8, and the universal cord portion 9, and the proximal end side of the light guide 20 reaches the scope connector portion 10, and the light source 20 The illumination light supplied from the lamp inside the apparatus 3 is transmitted, and the front end surface of the illumination lens 21 is inserted (inserted) from the front end surface fixed to the front end portion 11 via the illumination lens 21 attached to the illumination window. The light is emitted to the side of the part 7 to illuminate a subject such as an affected part.

As shown in FIG. 2, the tip 11 has a substantially cylindrical side surface cut out from the tip to form a flat surface facing the side. The flat surface includes the illumination window, an observation window, and the like. Is provided adjacent to the longitudinal direction of the insertion portion 7.
An objective optical system unit 23 incorporating the objective optical system 22 is attached to the observation window. In addition, a solid-state image pickup unit 25 on which a charge coupled device (abbreviated as CCD) 24 is mounted as a solid-state image pickup device is attached to the base end of the objective optical system unit 23, and the objective optical system unit 23 and the solid-state image pickup unit 25 An imaging device 26 for imaging a subject is formed.
The optical image of the subject illuminated with the illumination light emitted from the illumination lens 21 is formed on the imaging surface of the CCD 24 by the objective optical system 22 and is photoelectrically converted by the CCD 24. The CCD 24 is mounted on a TAB tape 27 housed in the solid-state image pickup unit 25, and electronic components 28 such as transistors and capacitors are mounted on the TAB tape 27, and a signal is provided on the rear end side of the TAB tape 27. A cable 29 is connected.

The signal cable 29 is inserted through the insertion portion 7 and further connected to the video processor 5 via the scope cable 4 shown in FIG. Then, a video signal is generated from the imaging signal imaged by the CCD 24 by a signal processing circuit in the video processor 5, and this video signal is displayed on the monitor 6.
FIG. 3A shows a plan view of the tip 11 viewed from the upper side of the paper surface in FIG. As shown in FIG. 3 (A), the vicinity of the center adjacent to the illumination window and the observation window in the distal end portion body 31 constituting the distal end portion 11 is cut out from the distal end side, and a treatment instrument raising base (hereinafter simply referred to as a raising base). Abbreviated) 32 is arranged.
Further, a raising drive mechanism 33 for raising the raising table 32 is disposed adjacent to the raising table 32 (on the side opposite to the adjacent illumination window and observation window). The raising table 32 and the raising drive mechanism 33 are arranged. Thus, a raising device is formed.

The raising drive mechanism 33 is connected to a wire 34 that transmits the raising force. As the raising drive mechanism 33, as shown in FIGS. 3B and 3C, an elevator base shaft 35 is attached to the elevator base 32, and the elevator base 32 can be rotated by the elevator base shaft 35. I support it. In addition, a shaft and a link 36 for applying a raising force are attached to the raising base 32.
And this link 36 is connected with the wire 34 via the connection member, By raising and retracting this wire 34, the raising base 32 can be raised as shown in FIG.3 (C). Note that FIG. 3B shows an outline of the raising operation as seen from the side of FIG. 3A, and FIG. 3C is a raising view taken along the BB cross section of FIG. The cross-sectional structure near the upper base is shown.
The wire 34 is inserted into a wire insertion tube 37, and the rear end of the wire 34 is connected to a raising operation knob 38 provided in the operation unit 8 of FIG.

The user can turn the raising operation knob 38 to move the wire 34 forward and backward so that the raising base 32 is raised or not raised. That is, by operating the raising operation knob 38, the raising angle of the raising base 32 can be adjusted to an arbitrary angle. The protruding direction of the treatment instrument can be varied by being regulated by the raising angle of the raising base 32. As will be described later with reference to FIG. 14, in this embodiment, the elevator 32 is set to the maximum elevator angle by providing the elevator shaft 35 by shifting the position of the elevator shaft 35 to the front end side compared to the conventional example. In this case, the distal end side of the treatment tool is easily captured in the observation visual field.
FIG. 4 shows an enlarged view of the image pickup device 26 shown in FIG.
As shown in FIG. 4, the front lens system of the objective optical system 22 is attached to the first lens frame 41, and the rear lens system is attached to the second lens frame 42. These lens frames 41 and 42 are fitted together. Connected.

Further, in this embodiment, the front end is externally fitted to the first lens frame 41, and a connection frame 43 is provided to cover the outer periphery of the portion where both the lens frames 41 and 42 are fitted to reinforce both the lens frames 41 and 42. Yes. In this case, the fitting portion between the first lens frame 41 and the connection frame 43 is bonded and fixed, and a step portion is provided in the second lens frame 42, and the adhesive 43 a is formed in the space inside the connection frame 43 and below the connection frame 43. And the front lens system and the rear lens system of the objective optical system 22 are positioned by adhering and fixing to the second lens frame 42. The imaging device 26 is positioned by the abutting portion of the first lens frame 41 and the fitting portion of the connection frame 43 with respect to the distal end portion main body 31.
Further, at the rear end of the lens frame 42, there is an imaging frame 44 in which a TAB tape 27 on which electronic components 28 are arranged around and at the rear end side of the CCD 24 arranged on the front end side of the solid-state imaging unit 25 is housed. Connected. The bottom of the imaging frame 44 is cut out, and a metal shield frame 45 having a substantially cylindrical shape and having a shielding function as shown in FIGS. 6A and 8A and FIGS. 8A and 8B. It is connected so as to cover. The shield frame 45 extends further to the rear side than the rear end of the imaging frame 44 and also covers the connection portion on the front end side of the signal cable 29 connected to the TAB tape 27.

The shield frame 45 is covered with a heat shrinkable tube 46. 8A shows a side view of the shield frame 45, and FIG. 8B shows a bottom view.
The shield frame 45 made thin has a bottom portion protruding forward, and the protruding portion is connected to the bottom portion of the imaging frame 44 that is cut obliquely as shown in FIG. In this way, by cutting the bottom rear end of the imaging frame 44 obliquely, the size in the height direction (side viewing direction) can be reduced.
In addition, an opening 45a is formed on the bottom surface of the shield frame 45 at the position shown in the cross section along line DD in FIG. This is because the width of the protruding portion on the bottom side is made wider than the width of the cylindrical portion on the rear end side (see FIG. 6B), and the shape of the protruding portion is stabilized at the time of bending (to prevent bending R). ). And as shown in FIG. 4, the front-end | tip is cut diagonally, the bottom face side covers the opening 45a with the heat-shrinkable tube 46 of the shape which protrudes ahead (from the upper end), and the opening 45a is closed, and a watertight function is ensured. is doing.

Further, as shown in FIGS. 4, 6B and 6C, the shield frame 45 is provided with an overlapping portion 45b (see FIG. 4) which is folded in an overlapping manner in the substantially rear half and overlapped. The structure is improved and its strength is improved. In addition, the front side has a shape that can be easily processed without being folded back (like the rear side) and can completely cover the upper part of the imaging frame 44 (even if the component dimensions vary).
It should be noted that the optical axis O of the objective optical system 22 is formed so as to be inclined slightly more backward than the side perpendicular to the axial direction of the insertion portion 7 as shown in FIGS. The lens frames 41 and 42 to which the system 22 is attached are also arranged along the optical axis O, and the imaging frame 44 attached to the rear end of the lens frame 42 protrudes to the front end side from the lens frame 41.
Further, the light guide 20 disposed adjacent to the front end side of the image pickup device 26 is bent at the front end side by more than 90 degrees, and protrudes (to the front end side) in the image pickup device 26 in the space formed by the bending. It arrange | positions so that a part of front end side may enter.

By arranging in this way, the rigid length of the tip portion main body 31 is shortened. In the illustrated example shown in FIG. 2, the front end portion of the imaging frame 44 is located on the front end side by the portion indicated by the distance L from the position of the rear end of the illumination lens 21. The rigid length of the main body 31 can be shortened.
Further, as shown in FIG. 5, the width of the TAB tape 27 arranged on the inner side with respect to the width of the imaging frame 44 is set to a dimension that maintains an appropriate clearance a. That is, even when the TAB tape 27 in which the CCD 24 is mounted with a positional deviation (horizontal direction, rotational direction) within the standard range with respect to the imaging frame 44 in which the clearance is secured is stored. The variation of the tilt angle (rotation angle around the central axis of the imaging surface) can be kept below a required value.

In this embodiment or its modification, basically, a direct-view type in which the optical axes of all the lenses are arranged on one optical axis that is widely adopted in existing direct-view endoscopes. The objective optical system 22 is used.
More specifically, the objective optical system 22 of the present embodiment or the modification is an optical system as shown in FIG. 7A or 7B.
In FIG. 7A, similarly to the case shown in FIG. 4, the optical axes of all the lenses constituting the objective optical system 22 are arranged along the optical axis O represented by a single straight line. In this case, the viewing angle setting means is formed so that the upper viewing angle θa and the lower viewing angle θb with respect to the optical axis O by the objective optical system 22 are equal. In this case, in all the lenses constituting the objective optical system 22, the optical axis of each lens is arranged on one optical axis O, and each lens has a rotationally symmetric shape. As shown in FIG. 7A, the upper viewing angle θa and the lower viewing angle θb are set to be equal.

7A and 7B, the imaging surface (light receiving surface) of the CCD 24 is disposed perpendicular to the optical axis O. That is, the imaging surface of the CCD 24 is arranged substantially parallel to the longitudinal direction of the insertion portion 7. In addition, the image formed on the left side (front end side) of the imaging surface is displayed so as to be on the upper side when displayed on the monitor 6.
The optical axis O is located at the center of the imaging surface of the CCD 24, and images with viewing angles θa and θb are formed on the left half and the right half of the center of the CCD 24.
In the case of FIG. 7A, an upper viewing angle θa that forms an upper half image formed on the imaging surface of the CCD 24, and a lower viewing angle θb that forms a lower half image. Are set to be equal.
In the case of the objective optical system 22 in FIG. 7A, an image captured by the CCD 24 is displayed in the endoscope image display area 6a of the monitor 6 as shown in FIG. 9A. Displayed as an image.

In FIG. 9A, the upper half image area corresponding to the viewing angle θa is indicated by reference numeral Ia, and the lower half image area corresponding to the viewing angle θb is indicated by reference numeral Ib. FIG. 9A shows a schematic view when the treatment tool is observed when the treatment tool protrudes in a state where the raising base 32 is set to the maximum raising angle state. The tip side of the tool almost appears (displayed) on the upper side of the visual field range.
Thus, when the image formed on the CCD 24 is displayed in the endoscope image display area 6a of the monitor 6 by setting the viewing angle as shown in FIG. The images are displayed at the same imaging magnification.
Therefore, since the upper viewing angle in the case of Patent Document 2 is set wide, it is possible to eliminate the small display when the treatment tool is observed, and it is possible to obtain an image that is larger and easier to observe.

On the other hand, in the case of the modification shown in FIG. 7B, the optical axis of all lenses except the first lens 22a as the most advanced optical element constituting the objective optical system 22 is a single straight line. Only the first lens 22a is arranged along the optical axis O represented, and the wedge thickness is such that the thickness of the lens increases toward the distal end of the insertion portion 7 and the thickness of the rear lens decreases. What has been adopted.
The direction of the optical axis O is set to the optical axis O ′ refracted toward the distal end side of the insertion portion 7 by the first lens 22a. In the case of this modification, the upper viewing angle θa with respect to the incident-side optical axis O ′ by the objective optical system 22 is set to be smaller (narrower) than the lower viewing angle θb.
That is, the narrow viewing angle θa is imaged on the upper half of the imaging surface of the CCD 24, and the wide viewing angle θb is imaged on the lower half of the imaging surface of the CCD 24. The magnification of the image is larger than the magnification of the lower half image.
Therefore, the upper half image can be displayed larger, and the image of the treatment instrument that is displayed on the upper side can be displayed and observed larger.

In other words, the upper viewing angle θa corresponding to the upper half image formed on the imaging surface of the CCD 24 is set to be narrower than the lower viewing angle θb corresponding to the lower half image. In this case, as shown in FIG. 9B, the image captured by the CCD 24 is displayed as an endoscopic image in the endoscopic image display area 6a of the monitor 6.
In the case of FIG. 9B, the image of the treatment instrument that appears in the upper viewing angle θa than in the case of FIG. 9A is displayed larger.
When the image formed on the CCD 24 is displayed in the endoscope image display area 6a of the monitor 6 by setting the viewing angle as shown in FIG. 7B, the upper viewing angle θa corresponding to the upper viewing angle θa is displayed. The imaging magnification of the image area Ia is displayed larger than the lower image area Ib corresponding to the lower viewing angle θb.
Therefore, since the upper viewing angle in the case of Patent Document 2 is wide, it is possible to eliminate the small display when observing the treatment tool or the subject, and it is possible to observe in a state where the display is larger and easier to observe. It becomes like this.

As described above, in this embodiment and the modification, particularly when a treatment tool or a subject is put in the field of view and treated, it is displayed larger so that the treatment can be performed more easily. Inside the imaging frame 44 of the solid-state imaging unit 25, the CCD 24 is mounted on the TAB tape 27 shown in FIG. 10 shows the front surface (component mounting surface side) of the TAB tape 27, and FIG. 11 shows the back surface thereof.
As shown in FIG. 12A, the TAB tape 27 has pattern portions 27b and 27d formed on the second and fourth layers on the upper surface of the third (polyimide) substrate resin 27c. The upper surface of the layer pattern portion 27b is covered with the first layer resist 27a, and the bottom surface of the fourth layer pattern portion 27d is covered with the fifth layer resist 27e.
In this embodiment, as shown in FIG. 10, on the TAB tape 27 near the front boundary of the region 51 indicated by the dotted line on which the CCD 24 is mounted, a slit-shaped cut portion (pattern exposure) is provided so as to leave both edges of the substrate resin. Part) 52, and the TAB tape 27 is easily bent at the cut part 52. Note that the pattern portion remains, and the cut portion 52 is formed (by the deletion of the polyimide substrate resin portion) so as to be exposed at the cut portion 52 (the same applies to the cut portion 58 described later). .

  Then, the lead protruding from the tip of the TAB tape 27 is electrically connected to the CCD 24 as shown in FIG. 12A, and the tip side of the TAB tape 27 is bent at the cut portion 52 as shown in FIG. It is housed in the imaging frame 44. The tip of the inner lead protruding from the TAB tape 27 is bump-connected to the CCD 24.

As described above, by providing the cut portion 52 on the front end side of the TAB tape 27, a stable bending process of the front end side portion of the TAB tape 27 can be performed. And the size of the imaging frame 44 in the longitudinal direction can be shortened by this bending process, and the hard length of the tip end body 31 can be shortened.
Further, as shown in FIG. 10, a recess 53 is formed near the rear end boundary of the area 51 where the CCD 24 is mounted on the TAB tape 27 by removing (cut) the resist of the first layer of the TAB tape 27. The back surface of the CCD 24 is structured so as to prevent the back adhesive 54 from sticking out to the TAB tape 27 when the back surface of the CCD 24 is bonded and fixed to the TAB tape 27 with the adhesive 54, and the length of the protrusion can be visually confirmed.

That is, when the back surface of the CCD 24 is bonded and fixed to the TAB tape 27 with the adhesive 54 in the state where the recess 53 is formed as shown in FIG. 10, the adhesive 54 temporarily becomes the CCD 24 as shown in FIG. Even if it protrudes from the back surface to the TAB tape 27 side, it has the effect of restraining to suppress the protrusion to the rear side by the surface tension of the adhesive 54 at the boundary of the recess. In addition, the protrusion 53 can be roughly grasped by the recess 53 from which the resist is removed.
Further, as shown in FIG. 10, there are provided dummy patterns 55 for anchoring that are not electrically connected to the CCD in the vicinity of both edges in the width direction in the region 51 where the CCD 24 is mounted. Each dummy pattern 55 protrudes slightly above the inner part where the dummy pattern 55 is not formed. The upwardly protruding dummy pattern 55 prevents the adhesive 54 from protruding in the width direction when the back surface of the CCD 24 is fixed to the TAB tape 27 with the adhesive 54.

That is, as shown in FIG. 12B showing a cross section taken along the line HH in FIG. 12A, the dummy pattern 55 can prevent the adhesive 54 from protruding.
As shown in FIG. 10, each dummy pattern 55 extends to the rear side of the CCD 24 so as not to affect the surrounding pattern and the like.
Further, as shown in FIG. 10, a ground pattern 56 is provided in the area 51 where the CCD 24 is mounted. The size of the ground pattern 56 is suppressed to only a part near the center, for example. A region 57 in which the adhesive 54 is accumulated is formed at a portion where the pattern 56 is not provided.
Thus, by forming the area | region 57 which accumulates the adhesive agent 54, the protrusion to the circumference | surroundings can be reduced or suppressed.

Further, as shown in FIG. 10 and FIG. 11, a cut in which the polyimide resin portion is cut into a slit shape in the vicinity of the rear end boundary of the region 51 where the CCD 24 is mounted on the TAB tape 27, specifically adjacent to the concave portion 53. A portion 58 is provided to make it easy to bend.
That is, the TAB tape 27 on which the CCD 24 and the like are mounted in a state in which the TAB tape 27 is slightly bent by the cut portion 58 and is filled with an adhesive 59 or a filler as shown in FIG. It is fixed in the imaging frame 44. Furthermore, the adhesive 59 is also filled in the upper part of the flange (projecting from the rear end side in the longitudinal direction) of the second lens frame 42. Due to the strength of the adhesive 59 (during curing), the tilt resistance of the imaging device 26 (the solid imaging unit 25 is raised with respect to the objective optical system unit 23) is improved.
In this case, the rear side of the cut portion 58 of the TAB tape 27 is disposed and fixed in the imaging frame 44 and the shield frame 45 so as to be parallel to the longitudinal direction of the distal end portion 11. In order to suppress the height (distance in the side view direction) of the imaging device 26, the TAB tape 27 is bent at least until it is parallel to the longitudinal direction of the distal end portion 11.
Also, as shown in FIG. 12A, an electronic component such as a transistor is placed on the TAB tape 27 at a slight distance from the position where the bending cut portion 53 is provided adjacent to the position where the CCD 24 is bonded and fixed. 28 is implemented.

In this manner, even if the adhesive 54 protrudes to the TAB tape 27 side, the TAB tape 27 can be bent at a position where it is desired to be bent by mounting the electronic component 28 at a slight distance.
Further, as shown in FIG. 10, the width of the TAB tape 27 is tapered so that the width of the rear end is smaller than the width of the front end (front end).
In this way, when the CCD 24 is mounted on the front end side of the TAB tape 27, the width on the rear end side is reduced in a tapered shape even if the longitudinal direction of the TAB tape 27 is slightly inclined. It can be accommodated within a predetermined width compared with the case where it is not made smaller.
Further, in a portion other than the position where the TAB tape 27 is desired to be bent, an electronic component 28 is mounted as shown in FIG. By doing so, the TAB tape 27 can be hardened by mounting the electronic component 28 at a position other than the position where the TAB tape 27 is desired to be bent, and can be handled stably.

In the above description, in the cut portion 58 formed in the TAB tape 27, most of the TAB tape 27 extends in the horizontal direction of the tip portion 11, but as shown in FIG. The horizontal length H of the TAB tape 27 may be made shorter than in the case of FIG.
In FIG. 13, for the purpose of comparison, an outline of the vicinity of the TAB tape 27 in the case of FIG. 4 is shown on the lower side, and the horizontal length H can be made shorter by ΔH than in this case.
For this reason, the length of the shield frame 45 can also be shortened, and the hard length of the tip portion can be further shortened.
As shown in the upper side of FIG. 13, the signal line of the signal cable 29 is preferably connected to the back surface of the TAB tape 27 so that it can be easily accommodated in the shield frame 45.

In the present embodiment, for example, the same compatibility as that in the case of using the treatment instrument in the case of Patent Document 2 is ensured.
In other words, as described above, in this embodiment, the first lens 22a in the objective optical system 22 is different from the conventional example of Patent Document 2. Therefore, as described above, the upper viewing angle θa can be made smaller (narrower) than in the case of the conventional example.
In this case, when the treatment tool is used with the other parts having the same configuration because the upper viewing angle θa is reduced, the treatment tool protrudes from the distal end opening 19a of the channel 19 and the raising base 32 is set to the maximum raising angle. When it is raised at the top, there is a possibility that the most advanced part of the treatment tool protrudes outward from the upper end of the visual field range.
For this reason, in this embodiment, as shown in FIG. 14, the position of the elevator shaft 35 of the elevator 32 is shifted to the distal end side as compared with the conventional example so that it can be rotated (rotated) by the distal end body 31. It is configured to support.

More specifically, the upper viewing angle θa in the present embodiment, the upper viewing angle in the conventional example is θa ′, the distance between the optical axis O and the raising base shaft 35 is La, and the optical axis O and the conventional example. When the distance from the elevator base shaft 35 ′ is La ′, the viewing angle θa ′ is larger than the viewing angle θa, that is, the value of the difference La′−La (the difference distance ΔL) by the difference Δθ of θa′−θa. ), And in this case, Δθ / θa ′ ≦ ΔL / La ′
It is set to become.
As described above, the shafts 35 ′ and 35 for rotatably supporting the optical axis O and the raising base 32 in the conventional example and the present example by the difference between the upper viewing angles θa ′ and θa in the conventional example and the present example. The distances La ′ and La are increased or decreased. In this way, when the treatment tool is used also in the case of the present embodiment, the treatment tool tip (within the field of view range) can be treated with the tip of the treatment tool within the field of view range. Ensure compatibility).

The operation in this case is shown in FIG.
In FIG. 15, the first lens 22a 'and the visual field range A' indicated by dotted lines show the case of the conventional example, whereas the first lens 22a and the visual field range A shown by solid lines show the case of the present embodiment. . As shown in FIG. 15, according to the present embodiment, the visual field range in the vertical direction is changed from the front end side (lower side) from A ′ to A due to the change in the viewing angle by the first lens 22a. (Viewed in the horizontal direction in FIG. 15 for simplification).
For this reason, in the conventional example, the distal end of the treatment instrument 49 ′ indicated by the dotted line is within the visual field range A ′. However, in this embodiment, the visual field range is shifted to the distal end side as indicated by A. In addition, a part of the distal end of the treatment instrument 49 ′ does not fall within the visual field range as it is, but, as described with reference to FIG. It protrudes from the position shifted to.

  That is, by setting the guide characteristic such that the curved line protruding from the treatment instrument as indicated by the dotted line is shifted to the distal end side, the visual field range A to the distal end of the treatment instrument 49 as indicated by the solid line also in the present embodiment. It can be put inside.

  As described above, when the treatment is performed by projecting the distal end side of the treatment instrument in the state where the raising base 32 is raised to the maximum elevation angle, the distal end side of the treatment instrument that is also projected in this embodiment is the same as that of the conventional example. Since it is made to catch within the visual field range like the case, favorable operativity can be ensured. In addition, when the electronic endoscope system including the conventional electronic endoscope and the electronic endoscope 2 of the present embodiment is configured, the distal end side of the treatment tool is moved by the raising operation of the raising base 32. Compatibility can be ensured for functions captured within the field of view.

The effect | action by a present Example by such a structure is demonstrated. An explanation will be given of a case where, for example, the periphery of the duodenum is subjected to endoscopy using this electronic endoscope 2.
When observing the duodenum, a side-view type endoscope that can be observed laterally with respect to the insertion direction of the endoscope is suitable. In some cases, the insertion portion 7 of the electronic endoscope 2 of this embodiment is inserted to observe the papilla of the duodenum, and a treatment tool is introduced into the bile duct and pancreatic duct intervening there.
In such a case, the treatment instrument is inserted from the treatment instrument insertion port 19b, and the distal end side of the treatment instrument projects from the distal opening 19a.

Further, when the raising operation knob 38 is operated to reach the maximum raising angle state, as shown in FIG. 9A, an image region in the upper half of the image displayed in the endoscope image display area 6a. An image of the distal end portion of the treatment tool protruding toward the Ia side can be displayed.
In this case, since the distal end portion and the subject of the treatment instrument can be displayed larger than the conventional example as described above, the treatment instrument can be easily introduced into the bile duct and pancreatic duct, and the treatment with the treatment instrument can be easily performed. Operability can be improved.
Further, in this embodiment, an elevator shaft 35 that rotatably supports the elevator 32 is provided at a position shifted to the distal end side of the conventional example, and the distal end portion of the raised treatment instrument is observed in the observation field of view. The operability when using a treatment tool can be improved.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 16 shows the configuration of the objective optical system portion of the image pickup apparatus in Embodiment 2 of the present invention. In the present embodiment, for example, the first lens 22a in the objective optical system 22 in the first embodiment is shifted in a direction perpendicular to the optical axis O of the lens system other than the first lens 22a, and the upper viewing angle θa is set to the lower side. The viewing angle is smaller than θb.
That is, as shown in FIG. 16, the optical axis of the first lens 22 a is orthogonal to the optical axis O, and the upper viewing angle side (the rear side in the longitudinal direction of the insertion portion 7), that is, the distal end portion. 11 is moved in a direction away from the illumination lens 21 (the movement distance is d, for example), and is fixed to the lens frame 41 with an adhesive 60.
In this case, the first lens frame 41 was a circular hole in which the shape of the hole at the upper end of the first lens frame 41 fits the outer diameter of the first lens 22a. The first lens 22a is shifted rearward and fixed by the adhesive 60 by changing the cross section from a circular shape to an oval shape.

Since the first lens 22a is shifted rearward and fixed to the first lens frame 41 in this way, a gap is formed in the front portion between the first lens 22a and the first lens frame 41 as shown in FIG. The adhesive 60 is filled and fixed.
By adopting such a configuration, when the treatment tool is used with a simple configuration in which the upper viewing angle θa is made smaller than the lower viewing angle θb in substantially the same manner as in the first embodiment, the treatment tool is greatly observed. It is easy to do.
In this case, when the optical axis of the first lens 22a is orthogonal to the optical axis O and is moved and attached to the distal end side, that is, the lower viewing angle θb side, the upper viewing angle θa decreases as shown in FIG. Will be described with reference to FIG. In the following description, the viewing angle θa is described using α, and the viewing angle θb is described using β.

FIG. 17A shows a state in which the first lens 22a is arranged on the optical axis of the objective optical system without moving the optical axis. In FIGS. 17A and 17B, the objective optical system 22 is shown as one objective lens.
In this case, the light beam incident along the optical axis passes through the optical axis and is received at the center position of the light receiving surface 4a of the CCD 24.
Also, as shown in FIG. 17A, a light ray (referred to as a viewing angle upper ray) incident on the objective optical system (objective lens) along the upper viewing angle α and an object along the lower viewing angle β. Light rays incident on the optical system (light rays at a lower viewing angle) are respectively received at the end of the light receiving surface 24a.
In this state, the magnitude relationship between the viewing angles α and β is
α = β
It is.

When the first lens 22a is moved from this state to the lower viewing angle side by the relative distance d as in the second embodiment, equivalently, as shown in FIG. This corresponds to the movement to the viewing angle side. Note that in FIG. 17B, a dotted line indicates the state of FIG. In the state of FIG.
Upper viewing angle α '= α + θ1-θ2
Lower viewing angle β '= β + θ2-θ3
Here, the magnitude relationship between θ1, θ2, and θ3 is based on the geometrical relationship shown in FIG.
θ2>θ3> θ1
Therefore, the magnitude relationship between α ′ and β ′ is
From α ′ <α, β <β ′,
α '<β'
It becomes.

At this time, the regions of the light receiving surface 24a where the light rays α ′ and β ′ are incident are equal.
Based on the above relationship, the upper viewing angle α ′ is smaller than the lower viewing angle β ′ by making the upper viewing angle α ′ and the lower viewing angle β ′ the same area in the light receiving surface 24a. Therefore, the magnification of the upper viewing angle α ′ in the endoscopic image can be made larger than the magnification of the lower viewing angle β ′. According to the present embodiment, substantially the same effect as that of the first embodiment can be obtained.
In this example, the first lens 22a of the objective optical system 22 in Example 1 is moved. However, as a first modification, instead of moving the first lens 22a as shown in FIG. The first lens frame 41 may move rearward with respect to the second lens frame 42.

For this reason, for example, in the case of Example 1, the second lens frame 42 has a shape that fits with the cylinder at the rear end of the first lens frame 41. However, for example, the second lens frame 42 has an oval cross section. The first lens 22a side is fixed with an adhesive 60 or the like in a state shifted from the optical axis O of the rear lens to the rear side (direction away from the illumination lens 21).
Since the first lens frame 41 side is shifted to the rear side and fixed to the second lens frame 42, the front side portion of the first lens frame 41 and the second lens frame 42 is arranged as shown in FIG. An adhesive 60 is filled and fixed in the gap that can be formed.
This first modification has the same effect as this embodiment. In addition, the CCD chip 24 side may be moved from the optical axis O of the objective optical system 22 to the front side as in the second modification shown in FIG.

In the embodiment described above, when the upper and lower viewing angles are formed to be different, the image distortion may be corrected by the video signal processing circuit inside the video processor 5.
It should be noted that embodiments configured by partially combining the above-described embodiments and modifications also belong to the present invention.

[Appendix]
1. The viewing angle setting means is formed by making the thickness of the optical element arranged on the most distal side in the objective optical system into a wedge shape such that the distal end side of the insertion portion is thicker than the rear side. The electronic endoscope according to claim 1.
2. The viewing angle setting means is formed by disposing an optical axis of a part of the optical system in the objective optical system relative to the central axis of the light receiving surface of the solid-state image sensor relative to the longitudinal direction of the insertion portion. The electronic endoscope according to claim 1, wherein:
3. An illumination lens that emits illumination light is disposed adjacent to the imaging device including the objective optical system and a solid-state imaging device at the distal end portion, and the surface of the illumination lens is perpendicular to the longitudinal direction of the insertion portion. 2. The electronic endoscope according to claim 1, wherein the imaging device is arranged with respect to the illumination lens at a position where at least a part of the imaging device enters a region projected in a different direction. mirror.

(Appendix 3)
Background Art: Since an imaging apparatus for a side-view type electronic endoscope using a direct-viewing optical system has a shape in which the imaging apparatus protrudes toward the distal end side from the distal end of the first lens of the objective lens, the imaging apparatus further toward the distal end side of the imaging apparatus In the configuration in which the illuminating device is arranged, the hard end length is long.
Problem: Due to the length of the hard tip, the handling was not good.
Purpose: To shorten the hard end length by shortening the axial distance (longitudinal direction) between the insertion portion of the imaging device and the illumination device, and to achieve the purpose, the configuration of Appendix 3 was adopted.
4). A TAB tape is disposed on the solid-state image pickup device of the image pickup device so as to cover the back surface of the solid-state image pickup device and extend in the longitudinal direction of the insertion portion, and the TAB tape includes a resin constituting the TAB tape. The electronic endoscope according to appendix 3, wherein the removed pattern exposure portion is provided, and the TAB is bent at the pattern exposure portion.

(Appendix 4)
Background Art: In a side-view type electronic endoscope imaging device using a direct-viewing optical system, a TAB tape of a solid-state imaging device is drawn in the longitudinal direction of an insertion portion, so that the length of the TAB tape is hard to image. Had an influence on the length.
Problem: The imaging hard length was long depending on the length of the TAB tape.
Objective: The purpose is to fold the TAB tape to shorten the length in the insertion axis direction and shorten the imaging rigid length.
(Claim 2)
Background Art: A side-view type electronic endoscope using a direct-view optical system has a wide upper maximum viewing angle.
In the above case, there are drawbacks described in the text.
Objective: To this end, the objective is to narrow the upper maximum viewing angle. In addition, if the upper maximum viewing angle is narrowed, the distal end of the treatment tool may be out of the field of view at the time of maximum raising. The purpose is to ensure operability. That is, the object of the present invention is to make the distal end of the treatment instrument enter the field of view at the maximum start-up, and in order to achieve the object, the structure of claim 2 is adopted.

  When the insertion part of the electronic endoscope is inserted into the body cavity and the distal end side of the treatment instrument is protruded from the distal end opening of the channel, the periphery of the distal end of the protruded treatment instrument is displayed large. become.

The block diagram of the electronic endoscope system provided with Example 1 of this invention. The figure which shows the cross-section of the principal part in the insertion part of an electronic endoscope. The figure which shows the top view etc. of the structure of the front-end | tip part vicinity seen from the side of the insertion part of FIG. Sectional drawing which shows the cross-section of the whole imaging device. CC sectional view taken on the line of FIG. Sectional drawing of the DD line of FIG. 4, EE line, and FF line. FIG. 3 is a diagram illustrating a configuration of an objective optical system portion in the imaging apparatus. The figure which shows the structure of the frame of a solid-state imaging unit. Explanatory drawing which shows the endoscopic image displayed on a monitor. The top view which shows the structure of the components surface (surface) of a TAB tape. The top view which shows the structure of the back surface of FIG. The figure which shows the GG line cross section etc. in the state which mounted the electronic components etc. on the TAB tape of FIG. The figure which shows a part of imaging device in a modification. Explanatory drawing of the structure at the time of giving compatibility so that the front end side of a treatment tool can be caught in a visual field range similarly to the case of the existing electronic endoscope. Explanatory drawing of an effect | action of FIG. Sectional drawing which shows a part of structure of the imaging device in Example 2 of this invention. FIG. 17 is an operation explanatory diagram in the case of FIG. 16. Sectional drawing which shows the structure of a part of imaging device in a 1st modification and a 2nd modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic endoscope system 2 ... Electronic endoscope 5 ... Video processor 6 ... Monitor 7 ... Insertion part 8 ... Operation part 11 ... Tip part 19 ... Channel 19a ... Tip opening 20 ... Light guide 21 ... Illumination lens 22 ... Objective Optical system 22a ... first lens 23 ... objective optical system unit 24 ... CCD
DESCRIPTION OF SYMBOLS 25 ... Solid-state imaging unit 26 ... Imaging device 27 ... TAB tape 28 ... Electronic component 29 ... Signal cable 31 ... Tip part main body 32 ... Raising stand 33 ... Raising mechanism 35 ... Raising stand axis | shaft 41, 42 ... Lens frame 43 ... Connection frame 44 ... Imaging frame 45 ... Shield frame 46 ... Heat-shrinkable tube Agent Patent attorney Susumu Ito

Claims (4)

An insertion portion that is inserted into a body cavity and provided with a channel through which a treatment tool is inserted;
A tip body provided at the tip of the insertion portion;
A raising device that is provided in the distal end main body and is arranged in the vicinity of the distal end opening of the channel and that changes the protruding direction of the treatment instrument protruding from the distal end opening;
A solid-state imaging device that is provided in the distal end body and captures an image in a body cavity as an endoscopic image;
A first viewing angle and a lower half of the first half for forming an upper half image on the endoscopic image, provided on the distal end main body, and having a side direction substantially orthogonal to the longitudinal direction of the insertion portion as a viewing direction. An objective optical system for forming an image in a body cavity on the solid-state imaging device, and a second viewing angle for forming an image;
When the treatment tool is raised to the upper side of the visual field range by the raising device, a part or the whole of the treatment tool is displayed in an upper half image based on the first viewing angle. Te, and the viewing angle setting means for smaller than said second viewing angle the first viewing angle,
An electronic endoscope comprising: The objective optical system is a direct-view optical system, a treatment instrument which is projected from the distal end opening of the channel, when the maximum is elevating the elevation unit, the treatment instrument distal end endoscopic image The electronic endoscope according to claim 1, wherein the objective optical system and the raising device are arranged in a positional relationship so as to enter the inside. With a raising device for raising the treatment tool,
A first viewing angle for forming an upper half image on the endoscopic image and a second viewing angle for forming a lower half image are formed on the solid-state imaging device. Having an objective optical system,
A first electronic endoscope having the first viewing angle larger than the second viewing angle;
A raising device that raises the treatment tool and a first viewing angle for forming an upper half image and a second viewing angle for forming a lower half image on an endoscopic image are provided. An objective optical system that forms an image of the body cavity on a solid-state image sensor;
When the treatment tool is raised to the upper side of the visual field range by the raising device, a part or the whole of the treatment tool is displayed in an upper half image based on the first viewing angle. A second electronic endoscope having the first viewing angle smaller than the second viewing angle;
With
With respect to the distance between the optical axis of the objective optical system in the first electronic endoscope and the rotation axis of the raising device, the optical axis of the objective optical system and the startup in the second electronic endoscope An electronic endoscope system characterized in that the distance from the rotation axis of the upper device is increased or decreased by a ratio of the different first viewing angle and second viewing angle. The objective optical system of the second electronic endoscope is a direct-viewing optical system, and a treatment tool protruding from a distal end opening of the channel of an insertion portion provided with a channel through which the treatment tool is inserted, The objective optical system and the raising device are arranged in a positional relationship such that the distal end side of the treatment instrument enters an endoscopic image when the raising device is raised to the maximum. Item 4. The electronic endoscope system according to Item 3.

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