JPH0943520A - Electronic endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic endoscope by which noise radiation from the endoscope having a solid-state imaging device is reduced and the infiltration of external noise is also reduced. SOLUTION: A solid-state imaging device 21 is arranged at the tip of the insertion section of an electronic endoscope 2. The device 21 is connected to coaxial lines 30 which consist of core wires 27 respectively coated with a first shield 28. The lines 30 are coated with common second shields 29 and the shields 29 are coated with a third shield 26 which is electromagnetic interference preventive means. The shield 26 is connected to the exterior metal of the endoscope 2 such as a scope conductive exterior member 40 and they are kept in an equivalent potential and form a large capacitance so as to reduce noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic endoscope provided with means for reducing the emission of unwanted radiation noise.

[0002]

2. Description of the Related Art Conventionally, a slender insertion part is inserted into a body cavity to observe a diseased part or the like in the body cavity, and a treatment tool is inserted into a forceps channel of an endoscope as necessary for treatment. Endoscopes that can be used are widely used. As the endoscope, for example, a solid-state imaging device such as a CCD at the tip of the insertion part is built in, a signal photoelectrically converted by this solid-state imaging device is transmitted by a signal cable, and converted by a video processor which is a signal processing means. An electronic endoscope device is used in which the video signal is displayed in color on a monitor device.

The electric signal transmitted from the solid-state image pickup device to the video processor via a signal cable is a high frequency signal. For this reason, noise is likely to be radiated from the signal cable that transmits the electric signal.
Further, the endoscope is formed by incorporating various electrically conductive metal members, and the endoscope is configured by incorporating a signal cable, a light guide, and the like in these metal members.

However, when constructing an endoscope, no consideration has been given to the arrangement position of these internal components with respect to the metal member, and regularity has been given priority in consideration of workability during assembly. . Therefore, after assembling the endoscope,
There is a tendency that noise radiation increases when the signal cable and the like are separated from the metal member forming the exterior.

Further, the signal line is connected to the individual circuit GND, but since the electrical continuity ensuring means after the metal member forming the exterior is assembled is not clarified, noise radiation is generated. It tended to increase.

Therefore, Japanese Patent Laid-Open No. 4-183432 discloses an electronic endoscope apparatus in which an unnecessary radiation noise reducing member such as a ferrite core is provided in the noise source to prevent the emission of unnecessary radiation noise. .

[0007]

However, in order to construct the electronic endoscope apparatus disclosed in Japanese Patent Laid-Open No. 4-183432, it is necessary to provide an unnecessary radiation noise reducing member for each line where noise is generated. Therefore, not only the cost is greatly increased, but also a space for mounting the unnecessary radiation noise reduction member is required, and the dead space is increased and the device is enlarged. Therefore, the number of unnecessary radiation noise reducing members to be used must be limited in order to avoid an increase in size.

On the other hand, since an endoscope apparatus equipped with an electronic endoscope handles various signals having different levels from general signals, unnecessary radiation noise radiated from the electronic endoscope is suppressed as much as possible, that is, an electric device apparatus. It is desired to sufficiently take measures against EMI (problem of giving electromagnetic interference).

The present invention has been made in view of the above circumstances, and provides an electronic endoscope capable of reducing the emission of noise from an electronic endoscope having a solid-state image sensor and the intrusion of noise from the outside. It is an object.

[0010]

In an electronic endoscope having a solid-state imaging device built in at the distal end of an insertion portion, a plurality of conductive members arranged in the endoscope are connected to equipotential and An electromagnetic interference countermeasure means provided on a signal cable for transmitting an electric signal from the solid-state image pickup device is connected to the conductive member so as to have the same potential as that of the conductive member. Therefore,
The radiation of noise and the intrusion of noise can be reduced also by the conductive member, and a large electrostatic capacitance is formed by making the potential equal to that of the electromagnetic interference countermeasure means. Intrusion can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 11 show a first embodiment of the present invention.
1 shows an overall configuration of an endoscope apparatus having the first embodiment of the present invention, and FIG. 2 shows an electronic endoscope having the first embodiment of the present invention. FIG. 3 shows the appearance of the mirror, FIG. 3 shows the configuration of the electric system of the electronic endoscope, FIG. 4 shows how the SID cable is inserted at the connecting portion between the operating portion and the universal cord portion, and FIG. 5 shows the electronic endoscope. 6 shows the tip end side of the insertion portion of the mirror, FIG. 6 shows the structure of the imaging unit, FIG. 7 shows the structure of the scope connector part, FIG. 8 shows the shape of the partition tube, and FIG. 9 shows the structure of the SID cable. , FIG. 10 shows SI
Fig. 1 shows how the D cable is covered with the third shield.
Reference numeral 1 shows a state in which the SID cable is looped and passed through a noise reducer.

The endoscope system 1 shown in FIGS. 1 and 2 is connected to the electronic endoscope 2 of the first embodiment provided with electromagnetic interference countermeasure means, and the electronic endoscope 2 is connected. A light source device 3 that supplies illumination light is connected to the electronic endoscope 2 via a scope cable 4, and signal processing is performed on a solid-state image sensor (hereinafter abbreviated as SID) 21 incorporated in the electronic endoscope 2. It is composed of a video processor 5 and a color monitor 6 for displaying a video signal inputted via a monitor cable connected to the video processor 5.

The electronic endoscope 2 has an elongated insertion portion 7 to be inserted into a body cavity, an operation portion 8 formed at a rear end of the insertion portion 7, and a universal portion extended from the operation portion 8. It has a cord portion 9 and a scope connector portion 10 which is provided at an end of the universal cord portion 9 and is detachably connected to the light source device 3. An electric connector receiver 51 is provided on the side of the scope connector unit 10, and the other end of the scope cable 4 in which the electric connector receiver 51 is provided with an attachable / detachable electric connector 4a is attachable / detachable to / from the video processor 5 by an electric connector 4b. Connected by.

The insertion portion 7 includes a tip portion 12 provided with an image pickup unit 86, a bendable bending portion 13 formed at a rear end of the tip portion 12, and a rear end of the bending portion 13 to an operating portion 8. It consists of a long flexible tube extending to the front end. The operation portion 8 is provided with a bending operation knob 14, and the bending portion 13 can be bent by gripping the grip portion 22 and operating the bending operation knob 14. In addition, an air supply / water supply control unit 15 that controls air supply / water supply and a suction control unit 16 that controls suction are provided on the side surface of the operation unit 8. further,
At the top of the operation unit 8, a switch unit 17 having a plurality of switches 17a is provided. As shown in FIG. 1, a light guide bundle 18 that transmits illumination light is inserted into the insertion portion 7, the operation portion 8, and the universal cord portion 9, and the rear end of the light guide bundle 18 reaches the scope connector portion 10. Transmits the illumination light supplied from the lamp inside the light source device 3,
The light is emitted forward from a front end surface fixed to the illumination window 72 of the front end portion 12 and illuminates a subject such as an affected area.

The illuminated object is imaged on the SID 21 arranged at the image forming position by the objective lens system 19 attached to the observation window 73 provided adjacent to the illumination window 72.
It is photoelectrically converted by ID21. S for this SID21
ID cable (or signal cable) 20 is connected,
The SID cable 20 is connected to the scope cable 4 via the noise reducer 11 housed in the scope connector unit 10.
The scope cable 4 is connected to the video processor 5.

In addition, an air / water supply conduit 23 is provided in the insertion portion 7.
The air / water feed conduit 23 is connected to the air / water feed control unit 15 by the operation unit 8, and the end of the universal / code unit 9 is inserted through the air / water feed conduit 23. The portion reaches the scope connector portion 10 and is connected to the air / water feeding mechanism in the light source device 3.

Further, the suction pipe line 2 inserted into the insertion portion 7
4 is divided into two near the front end of the operating portion 8 and one is a forceps port 2
5, and the other communicates with the suction conduit 24 in the universal cord portion 9 via the suction control portion 16 to reach the suction mouthpiece 24a of the scope connector portion 10.

As shown in FIG. 2, the suction pipe line 24 serves as a tip opening 24b that opens at the tip portion 12, and the tip opening 24b serves as a suction port for performing suction during a suction operation, and forceps is inserted from the forceps port 25. In this case, it is a forceps outlet through which the forceps project. The first embodiment is characterized in that an electromagnetic interference countermeasure mechanism is configured as shown in FIG.
It has become one. In FIG. 3, the scope connector unit 1
The configuration of 0 (see FIG. 1) is omitted.

Since the SID cable 20 connected to the SID 21 and transmitting an electric signal is formed of a plurality of core wires 27, 27, ..., Electric signals having various driving frequencies are transmitted to each core wire 27. For this reason, it is conceivable that the signal lines interfere with each other to generate noise (hereinafter referred to as noise interference). Therefore, each core line 27 is covered with the first shield 28 to form a pseudo coaxial line 30. This is to avoid noise interference.

That is, since the coaxial wire 30 is constituted by each core wire 27 and each first shield 28, the SID cable 20 is formed from a plurality of coaxial wires 30, 30 ...

Each coaxial line 30 is commonly shielded by a second shield 29 as a total shield of these coaxial lines 30 to form the SID cable 20. In this embodiment, this SID cable 20 connected to the SID 21
In order to reduce the electromagnetic wave noise radiated from the SID cable 20 and to reduce the intrusion (or mixture) of the electromagnetic wave noise into the SID cable 20, the third shield 26 is provided over the entire length of the SID cable 20 so as to cover the SID cable 20. I try to cover it.

When the structure in which the second shield 29 is shielded by the third shield 26 in the insertion portion 7 is adopted, and the diameter of the insertion portion 7 becomes large, this structure is adopted in at least the universal cord portion 9. It doesn't matter. This structure is adopted in the embodiments described later.

In other words, since it is considered that noise is leaked from each coaxial wire 30 to the outside and noise is mixed into the core wire 27 from the outside, it is shielded by the second shield 29.
Further, the second shield 29 is covered with the third shield 26 so that the emission and mixing of noise can be further reduced.

Drive signal for driving SID21 and SID2
The SID output signal photoelectrically converted in 1 is transmitted through the core wires 27, 27 ... In the SID cable 20 and is disposed inside the video processor 5 (via the noise reducer 11) in the first patient circuit. It is connected to 31.

The second shield 28 is the video processor 5
The second shield 29 is connected to the GND 32 of the first patient circuit 31 and the second shield 29 is connected to the GND 34 of the second patient circuit 33.

The GND 32 of the first patient circuit 31 and the GND 34 of the second patient circuit 33 are used for high frequency treatment.
Video processor 5 to ensure patient electrical safety
The power supply circuit 35 is independent (insulated) from the GND 36.

Further, an electromagnetic interference countermeasure mechanism is also formed in the switch section 17 as described below to reduce noise emission and mixing. The electric signal from each switch 17a of the switch unit 17 is connected to the second patient circuit 33 in the video processor 5 via the switch core wire 38a in the switch signal line 38. The switch signal line 38 is for transmitting a signal to the light source device 3 and the video processor 5 by operating the switch of the switch unit 17.

Each switch signal line 38 is composed of a switch core wire 38a and a switch shield 38b.
That is, each switch core wire 38a is covered with the switch shield 38b, and the switch shield 38b.
Are connected to the second shield 29, and are also connected to the GND 34 of the second patient circuit 33.

Therefore, the noise from the switch core wire 38a is transmitted to the second patient circuit 3 by the switch shield 38b.
It falls to GND 34 of 3. Further, the noise from the core wire 38a gets on the shield 38b, and the GN of the first patient circuit 31
Fall to D32. Since the GND 32 of the first patient circuit 31 and the GND 34 of the second patient circuit 33 are independent of each other, it is possible to prevent interference such as noise being mixed into other circuits via the GND.

Also, the switch shield 38b is GND.
By dropping it to 34, noise to the switch core wire 38a can be returned (closed). Therefore, the electromagnetic interference countermeasure mechanism for the switch unit 17 can eliminate or reduce the influence of noise on the image, and can also reduce unnecessary radiation noise.

On the other hand, noise due to electrostatic coupling caused by the potential difference between the signal lines which cannot be suppressed by the second shield 29 and the first shield 28 and noise due to electromagnetic induction caused by signal current are unnecessary. In order to shield radiation noise and the like, the outermost layer of the SID cable 20 is covered with a third shield 26, while the third shield 26 is made of a metal such as a scope exterior metal that constitutes the electronic endoscope (also referred to as a scope) 2. It is a feature (of the first embodiment) that it is connected to the scope exterior conductive member 40.

The scope exterior conductive member 40 does not use metal as the exterior metal member or exterior member of the scope 2, but utilizes the electrical properties of the conductive member formed on the inner surface of the exterior non-metal member, By utilizing the fact that a pseudo capacitor with a large electric capacity is formed, the third shield 2
The noise riding on No. 6 is accumulated in the scope exterior conductive member 40 to reduce the radiation of noise or absorb the noise from the outside (charge the capacitor and reduce the noise from being mixed into the core wire 27). I am also able to do that.

The third shield 26 is insulated from the core wire 27, the first shield 28, and the second shield 29 in consideration of electrical safety to the patient during high frequency treatment. There is. The third shield 26 is, for example, a shield metal blade having a density of 50% or more, and the SID cable 20 may be multiply covered as long as the filling amount in the scope 2 allows.

The exteriors of the insertion section 7, the operation section 8, the switch section 17, the universal cord section 9 and the scope connector section 10 of the electronic endoscope 2 are made of a conductive metal member or a non-conductive exterior member. It is composed of a member having a conductive metal film treatment. Then, the connecting portion between the inserting portion 7 and the operating portion 8, the connecting portion between the operating portion 8 and the switch portion 17, the connecting portion between the switch portion 17 and the universal cord portion 9, the universal cord portion 9 and the scope connector portion 10, Each of the connecting portions has a structure in which conductive surfaces are brought into contact with each other to ensure electrical continuity.

Therefore, the electronic endoscope 2 of this embodiment is
Form a scope exterior conductive member 40 surrounded by a metal member or a conductive member connected to an equipotential. Therefore, as described above, the third shield 26 is held at an equal potential with a large electric capacity, and it is possible to reduce the radiation of noise to the outside and the intrusion of noise from the outside to the inside.

FIG. 4 shows the SID cable 20 in the operation unit 8.
Shows a connecting portion between the universal cord portion 9 and the universal cord portion 9. The electronic endoscope 2 has a metal member as a skeleton. For example, as shown in FIG. 4, most of the connecting portion has such a structure so that two parts are connected, specifically, the fixing member 42 and the universal cord cap 39 are locked by screws. .

Generally, in order to improve the connection strength, SUS
Although parts with high hardness such as the above are used, since the weight becomes heavy, the same effect is obtained by applying a surface treatment to a lightweight metal such as aluminum to improve the connection strength.
However, since the surface treatment of the conventional example is non-conductive, it becomes non-conductive at the connection portion, and unnecessary radiation noise and the like increase.

In the present embodiment, in order to reduce radiation noise and the like, and a table process, for example, a CRO process, is adopted which can achieve electrical conduction while maintaining connection strength. This configuration reduces noise emission. That is, noise reduction is realized by ensuring an electrical conduction route between conductive members such as metal members in the electronic endoscope 2.

In addition, the electrical continuity route between the conductive members such as the metal members in the electronic endoscope 2 is secured, and the third shield 26 is electrically connected to maintain the same electric potential, and its large electrostatic capacitance is used. It also reduces noise emission and intrusion.

Hereinafter, a configuration example of each part of the electronic endoscope 2 will be described. As shown in FIG. 4, an operating portion support 41 that supports a bending operating mechanism and the like is fixed to the casing 8a of the operating portion 8, and the universal cord portion 9 is attached to the operating portion support 41.
The fixing member 42 to which the universal cord cap 39 at the base end is fixed is fixed with a screw 59 in a protruding state.

The SID cable 20 is 78 in the distal direction of the endoscope.
And is bent inside the operation portion 8 toward the universal cord portion 9 for wiring. Therefore, the universal cord mouthpiece 39 connecting the operating portion 8 and the universal cord portion 9 is bent at a substantially right angle as indicated by the symbol A, and is wired substantially parallel to the mouthpiece center line 43.

For example, the operating portion support 41, the fixing member 42, and the universal cord cap 39 are metal members and are electrically connected to each other. The casing 8a is a metal member or a non-metal member, and the inner surface thereof is subjected to CRO treatment or the like to be electrically connected to the universal cord cap 39. Also,
A conductive member is coated on, for example, the inner surface of the universal cord portion 9, and is electrically connected to the universal cord base 39. Therefore, the operating portion 8 and the universal cord portion 9 are electrically connected to each other by the outer cord member 39 serving as a connecting portion. The inner surface of the grid portion 22 is also coated with a conductive member, and the insertion portion 7
At the connecting portion of the base end portion of the above, the inner surface of the insertion portion 7 is electrically connected to the conductive member coated.

FIG. 5 shows the structure of the distal end side of the insertion portion 7, which is S
FIG. 6 shows a structure inside the image pickup unit 86 in which the SID 21 is stored in the ID cable 20. In FIG. 5, the bending portion 13
The flexible tube on the rear side of the is formed of an exterior member with a flexible resin tube, and the inner surface thereof has a conductive member as a skeleton.
The base end is electrically connected to the conductive member on the inner surface of the grip portion 22 as described above.

The tip side of the conductive member formed on the inner surface of the tube of the flexible tube is electrically connected to the metal bending piece, and the metal cylindrical member of the tip portion 12 and the tip fixing member 85 are provided. It conducts electricity.

As shown in FIG. 5, the image pickup unit 86 is fixed to the tip fixing member 85. The second shield 2 constituting the SID cable 20 inserted into the insertion portion 7
The front end 29a of 9 is fixed in the imaging unit 86. The second shield 29 is covered with an insulating coating material.

The bending portion 13 has a bending operation knob 14 in which a plurality of bending pieces are rotatably connected to each other and a bending wire 87 fixed to a tip fixing member 85 is provided in the operation portion 8 (see FIG. 2).
By rotating and pulling / relaxing the pair of bending wires 87, it is possible to bend to the pulled side. The bending wire 87 is made of metal such as stainless steel and is electrically connected to the tip fixing member 85.

In FIG. 5, the coaxial line 30 forming the SID cable 20 includes a substrate 91 and a substrate 92 on which transistors, capacitors, etc. forming a buffer amplifier are mounted.
Is connected by a connecting portion 88. The leads on the back surface of the SID 21 are also connected to the substrates 91 and 92.

An optical low-pass filter or the like is arranged on the front surface of the SID 21, and an objective lens system 19 (not shown in FIG. 5) is arranged on the front surface thereof.

FIG. 7 shows the structure of the scope connector section 10. As shown in FIG. 7, the scope connector unit 5 includes a connector case 68 as an exterior component formed by molding a resin member that is a non-conductive member. The connector case 68 has a second opening 69 that opens toward the light source device,
A third opening 70 that opens to the universal cord side and a first opening 52 that opens at a position orthogonal to an axis connecting the second opening 69 and the third opening 70 are provided.

The first opening 52 is an opening for an electric connector, and a base 57 made of a conductive material such as aluminum is provided in the internal space. A hole for inserting an electric wire is provided on the outer periphery of the base 57.

A first main body block 53 made of a non-conductive resin is provided in the second opening 69. A second body block 54 is arranged in the third opening 70. Part of these body blocks 53 and 54 is in contact with the base 57. The base 57, the first body block 53, and the second body block 54 form a connector body.

The first opening 52 of the connector case 68.
On the side is made of a conductive material such as aluminum, copper, SUS,
When connected to the light source device 3, a first fixing screw 60 formed of a non-conductive material in a state where the first lid body 90 serving as an endoscope side exterior metal is in contact with the first body block 53.
It is fixed by screwing. That is, the connector case 68 and the first main body block 53 are formed of a non-conductive material, and the conductive first lid 90 is formed on the base 57 with a non-conductive material. It is fixed via 60, and when connected to the light source device 3, the base 57 and the like are insulated from the casing of the light source device 3 or GND.

On the other hand, on the third opening 70 side of the connector case 68, with the second lid body made of a conductive material such as aluminum, copper or SUS abutting the second body block 54, Second fixing screw 61 formed of a conductive material
Is fixed to the base 57 by screwing.

The SID cable 20 has a sufficient length, is accommodated in the space 55 of the connector case 68, and is wound around the outer periphery of the shield tube 62 provided at the base end of the electric connector receiver 51 to form the electric connector. It is connected to a connection pin (not shown) of the receiver 51. The third shield 26 is inserted in a portion near the scope connector unit 10 (not shown) so as to form a loop in the noise reducer 11 fixed to a frame made of a conductive material (not shown). To do. The shield 26 is electrically connected to the base 57 via the frame and the second fixing screw 61. The base 57 is also electrically connected to the conductive member on the inner wall of the universal cord portion 9. That is, as shown in FIG. 3, the third shield 26 is electrically connected to the scope exterior conductive member 40.

There is an opening 56 in the bottom of the base 57 where the shield tube 62 around which the SID cable 20 is wound is arranged. The opening 56 fixes the conductive shield plate 64 to the base 57 with the third fixing screw 65, and electrically connects the shield plate 64 and the base 57 to each other.

As described above, the portion other than the hole for extending the SID cable 20 or the communication cable 94 from the space 55 is covered with the metallic shield.

Therefore, the noise radiated from the SID cable 20 can be prevented from leaking from the opening 56 by the shield plate 64. Further, there is an effect that noise radiation from the opening 56 can be shielded by attaching a separate member.

A partition cylinder 58 shown in FIG. 8A made of a conductive material such as brass is in contact with the inner peripheral surface of the base 57 in the space 55, and has a cross-sectional shape of the base 57. It is provided so as to cover the entire inner peripheral surface. For this reason, the light guide bundle and various tubes other than the electric wires are inserted through the outer peripheral side of the partition cylinder 58.

The conventional partition cylinder 58 'is shown in FIG. 8 (B).
Since the partition tube opening 67 'of the partition tube 58' does not cover the entire inner surface of the large base 57, noise is radiated.

On the other hand, in the partition cylinder 58 in this embodiment, as shown in FIG. 8A, radiation can be reduced by making the partition cylinder opening 67 extremely narrow to the extent that it does not hinder the mounting. I am able to do it. That is, the member having the opening has the effect of reducing radiation by narrowing the portion. Then, there is an effect that the radiation noise can be reduced.

In this embodiment, the SID cable 20 has a plurality of coaxial wires 30 and a second shield 29 as shown in FIG.
It is commonly covered by the above and is shielded comprehensively, and the outside is covered with an insulating coating material. Then, the SID cable 20 is covered with the third shield 26 shown in FIG. 10A, and while pushing and pulling the third shield 26 as shown by the arrow as shown in FIG. 10B, for example. By covering the third shield 26, an electromagnetic interference countermeasure means is formed.

Further, the scope connector section 10 is shown in FIG.
As shown in (A), the noise reducer 11 is formed in a loop shape to reduce noise emission. First, as shown in FIG. 11C, for example, the SID cable 20 exposed from the third shield 26 is inserted into the noise reducer 11 formed of a ferrite core or the like to form a loop around the noise reducer 11. Then, the case where the SID cable 20 is inserted through the noise reducer 11 again will be described. In addition,
The endoscope front end side 78 is on the left side, and inputs and outputs signals to and from the electric connector side 51 '(video processor side) on the right side.

In the insertion method of FIG. 11C, noise is radiated from the SID cable 20 around the noise reducer 11. Furthermore, since the shielding by the third shield 26 is hardly performed, the radiation is not reduced. In addition, since the exposed portion of the SID cable 20 is long, it is easily affected by external noise.

On the other hand, in FIG. 11D, the noise reducer 11 is passed through the noise reducer 11 in FIG. 11C with the third shield 26 covering the radiation from the SID cable 20 surrounding the noise reducer 11. . However, SID cable 2
The noise radiated from 0 is transmitted to and radiated to the third shield 26 of the shield protrusion 84 before being absorbed by the noise reducer 11.

Therefore, in this embodiment mode, FIG.
As shown in, the structure is such that the portion covered by the third shield 26 and the portion not covered by the third shield 26 are inserted at least once.

With such a structure, the influence of external noise is reduced because the exposed portion is small. In addition, the radiated noise is also absorbed by the noise reducer 11, so that it is reduced.

Note that FIG. 11B shows a first modification of FIG. 11A, and SI is further changed from the state of FIG. 11A.
The D cable 20 has a structure in which the noise reducer 11 is passed once again. If there is enough space for storage, such a structure will be more effective in reducing noise.

FIG. 12A and FIG. 12B show FIG.
The 2nd and 3rd modification of (A) is shown, and the part covered with the 3rd shield 26 and the part which it is desired to cover are inserted at least once. Also in FIGS. 12A and 12B, the left side is the endoscope tip side 78, and the right side is the (electrical connector side 51 ').

11 (A), (B) and FIG. 12 (A),
According to the structure (configuration) of (B), there is an effect that noise can be removed by passing the third shield 26 having noise through the noise reducer 11.

SI not covered by the third shield 26
Noise is absorbed by inserting the D cable 20 into the noise reducer 11. Since there are few exposed parts, it is not easily affected by external noise. Therefore, there is an effect that the noise reducer 11 can efficiently absorb noise.

Further, in the present embodiment, the exterior member of the scope 2 is formed of a conductive member such as metal or metal coating,
A third shield that shields most of the outside of the second shield 28.
Since it is electrically connected to the shield 26, it is possible to reduce radiation of noise and noise that enters the scope from the outside of the scope 2.

Further, when the scope exterior conductive member is formed by coating the inner surface of the outer tube of the flexible insertion portion 7 with a metal coating, the outer diameter of the insertion portion 7 does not increase so much. It is possible to maintain the thinning of the portion 7.

Next, a method for easily covering the SID cable 20 with the third shield 26 will be described. This method comprises the following steps. SID consisting of a solid-state image sensor (SID) and multiple signal cables
An imaging device having a cable and electromagnetic interference countermeasure means applied to the SID cable, comprising: a. Coating the outer surface of the rigid pipe with an electromagnetic interference countermeasure, b. While inserting the locking wire into the rigid pipe,
Locking the SID cable to the locking portion in front of the locking wire, c. After pulling the SID cable into the rigid pipe,
SI through the process of removing only the rigid pipe
D Electromagnetic interference countermeasure means mounting method in which electromagnetic interference countermeasure means is attached on the outer surface of the cable.

First, the background will be described. As described above, the electric signal transmitted through the SID cable for connecting the solid-state image pickup device at the tip of the endoscope and the video processor is a high frequency signal. For this reason, noise is likely to be radiated from the SID cable that transmits the electric signal.

As a means for reducing radiation, it is an effective means to attach a measure against electromagnetic interference to the SID cable.
A metal mesh tube is used as a measure against electromagnetic interference, but the SID cable in the endoscope has a long set length because it extends from the tip to the video processor. In order to provide a countermeasure for electromagnetic interference over the entire length, the mesh tube on the cable is inserted while being pulled up, but when considering mass production, it cannot be said that it is a work-efficient method.

FIG. 10B shows the third shield 2 when covering the entire length of the SID cable 20 with the third shield 26.
Although the insertion method of No. 6 is shown, the SID cable 20 and the third
The shield 26 has a length of about 4 m, and it takes time to work because the outer diameter of the SID cable 20 is close to the inner diameter of the third shield 26.

Therefore, it is an object of the present invention to provide a method of simplifying the workability in consideration of mass production, and in order to achieve this object, the above a. In step c, the SID cable can be easily covered with the shield material by this step, and a method suitable for mass production is realized.

The above steps will be specifically described below. FIG.
3 (A) to 13 (E) are explanatory views of a method of attaching the electromagnetic interference countermeasure means by the above steps. A hard pipe having hardness shown in FIG. 13A, for example, a metal pipe 47 has an inner diameter larger than the outer diameter of the SID cable 20 and an outer diameter smaller than the inner diameter of the third shield 26. .

The pipe 47 is inserted into the third shield 26. At this time, since the third shield 26 is a mesh tube, there are some portions that meander or bend. However, the pipe end 47a hits the meandering or bending portion,
The pipe 47 is deformed so as to follow the shape of the hard pipe 47.
Can be easily inserted into the third shield 26.

In FIG. 13B, after the pipe 47 has been inserted into the third shield 26, a locking portion 48 to be used for the next work.
The state that the locking wire 48 having a is inserted into the pipe 47 is shown. In this way, the locking wire 48 having the locking portion 48a is inserted into the pipe 47.

FIG. 13C shows that the SID cable 20 is hooked on the locking portion 48a to form the cable hooking portion 49. In this way, the SID cable 20 is hooked on the locking portion 48a to form the cable hooking portion 49.

Furthermore, the cable hooking portion 49 and the SI
The work for pulling in the D cable 20 as indicated by the arrow in the pipe 47 is performed. FIG. 13D shows the pipe 47 by the above work.
The cable hook 49 and the SID cable 20 pulled in are shown.

In FIG. 13E, the third shield 26 on the locking portion 48a is slid in the direction of the arrow, that is, in the direction of the SID cable 20, so that the third shield 26 is moved to the SID cable 20.
The shield 26 of FIG. That is, SI
Electromagnetic interference countermeasures can be attached to the D cable 20. As described above, if the method shown in FIG.
It is suitable for mass production.

Next, a second embodiment of the present invention will be described. In the second embodiment, the electromagnetic interference countermeasure means is formed as in the first embodiment, and the electromagnetic interference countermeasure means has the following configuration (a).

(A) In the electronic endoscope in which the solid-state image pickup device is built in at the tip of the insertion part, the end processing part of the electromagnetic interference countermeasure means provided in the signal cable for transmitting the electric signal from the solid-state image pickup device is provided in the operation part. At, signal cable 1
An electronic endoscope characterized in that a loop portion is formed once or twice or more and is positioned near an intersection of signal cables generated by the loop formation.

FIG. 14 shows the structure in the vicinity of the connection part of the SID cable between the operation part 8 and the universal cord part 9 in the second embodiment, which is an improvement of the structure of FIG. 4 in the first embodiment. is there.

Since the portion indicated by reference character A in the structure of FIG. 4 is bent almost at a right angle, when the distal end side of the endoscope is bent by a bending operation or the like, S covered by the third shield 26 is formed.
The ID cable 20 slides inside the operation unit 8. Due to this movement, the SID cable 20 may come into contact with the edge of the component, be scraped, and be broken. Also in the conventional example, there is such a structure without the third shield 26.

In order to avoid this phenomenon, a loop is formed once or twice or more by utilizing the space in the operation portion so that the wiring direction of the SID cable 20 is set substantially parallel to the universal cord portion 9 and the edge of the component is set. It is conceivable that the wires should be wired so that they do not hit the same. However, the SID cable 20
Since a high frequency signal is transmitted, noise is radiated, so that the noise is amplified by the loop once or twice or more. In order to reduce such amplified and radiated noise, a method of covering the SID cable 20 with a shield member can be considered.

However, by covering the inside of the operating portion, the filling rate of the built-in components increases, and a portion that affects the durability is generated. The arrangement of the shield member for avoiding that portion has not been clarified in the conventional example.

Therefore, in the present embodiment, the configuration as described in (a) or below is adopted for the purpose of reducing unnecessary radiation noise by disposing the shield material that does not damage the built-in object. There is. FIG. 15 (A) shows a means for avoiding abrasion in the reference numeral A of FIG.
5 (B) shows a view on arrow C in FIG. 15 (A). Operation unit 8
The fixing member 42 having a hollow structure with respect to the operating portion support 41 inside
Is locked upright. The hollow portion 80 of the fixing member 42
Universal cord base 3 of universal cord section 9
Lock 9

The fixing member 42 is locked to the operation portion support 41, and when it is assembled in the casing 8a, it is set so that the cable arranging space 79 is generated between the casing 8a and the universal cord side wall 81.

SID cable 2 from the tip side of the insertion portion 7
No. 0 inserts the cable arrangement space 79, draws around the fixing member 42 from the lower portion of the universal cord mouthpiece 39, bends in the direction of the universal cord mouthpiece 39, and forms the loop portion 44 so as to have a large bending radius. Then, wiring is performed so as to be substantially parallel to the center line 43 of the base. The loop portion 44 then forms a cable intersection 45.

As indicated by the symbol B, the back-and-forth movement is relieved by the loop portion 44 and the phenomenon of being scraped can be eliminated. However, the SID cable 20 transmits a high frequency signal in order to drive the SID 21. Therefore, always
It radiates noise.

The loop unit 44 based on the above-mentioned countermeasure is SID
The magnetic field generated around the cable 20 resonates, and noise radiation increases. Therefore, as shown in FIG. 14, by covering the SID cable 20 with the third shield 26 in order to reduce radiation, the loop portion 44 is shielded and noise is reduced.

The shield of the SID cable 20 other than the loop portion 44, especially the insertion portion 7 in the endoscope distal direction 78, is provided in order to avoid interference (filling rate) with other built-in portions and increase in diameter of the insertion portion 7. It is not covered in this embodiment.

Therefore, the third shield 26 is set from the inside of the operation portion 8 (to the universal cord portion 9), and the third shield 26 as the end portion of the electromagnetic interference countermeasure means is set.
It is necessary to ensure the position of the shield tip 26a and the processing method.

As shown in FIG. 14, the third shield tip 2
9a is covered with the heat-shrinkable tube 46 to form the fixing portion 83 so as not to damage other internal components. The position of the fixing portion 83 to be fixed is a portion near the intersection of the signal cable generated by the loop formation, as a portion that does not damage the filling rate in the operation portion 8 and other internal components while securing the shield of the loop portion 44. Is set in the cable installation space 79.

As described above, since the SID cable 20 is moved back and forth on the insertion portion side of the crossing portion 45 due to the bending operation and the like, for example, on the insertion portion side of the crossing portion 45, the area indicated by the reference symbol D in FIG. It is fixed near the grip 22.

When fixed in this way, it can move smoothly even if it moves back and forth, and even if it moves to the rearmost (upper side in FIG. 14) due to the bending operation, it is closer to the insertion part than the crossing part 45. The position of the fixed portion 83 (that is, the shield tip 26a of the third shield 26) is held at the position, and noise emission and the like can be reduced.

Next, a third embodiment of the present invention will be described. The SID cable 20 is
As shown in FIG. 9, the coaxial lines 30 are arranged in a circle.

In the case of this structure, when connecting to the substrate 91 and the substrate 92 in the image pickup unit 86 shown in FIG. 5, it becomes difficult to draw the wiring depending on the position of the coaxial line 23.
Further, since the shield end 29a of the second shield 29 is located on the endoscope distal end 71 side through the curved portion 13,
When the bending portion 13 is bent, the second shield 29 is pulled toward the operating portion 8 side and is drawn into the operating portion 8 side, so that the second shield 29 may be disconnected.

Therefore, in order to eliminate this possibility, the following structure may be adopted to achieve this purpose. First, the leading end side of the SID cable 20 is set as shown in FIG. 16 in consideration of routing.

In advance, the coaxial cables 30 connected to the substrate 91 and the substrate 92 respectively are put together in the flat cable portion 93.
Further, the second shield 29 is cut at a portion positioned after the rear end of the bending portion 13 on the video processor 5 side so as not to be broken due to being pulled toward the operating portion 8 during bending, so that the second shield 29 is cut off. The shield cut portion 95 is formed.

An image pickup unit 86 incorporating the SID cable 20 thus constructed is shown in FIG. In addition, FIG.
17 is a diagram showing the positional relationship between the second shield cut portion 95 and the bending portion 13 by incorporating the image pickup unit 86 of FIG. 17 in the distal end side of the insertion portion 7.

According to this embodiment, since the tip of the second shield 29, which is the total shield, is located on the hand side of the bending portion 13, the lengthening of the hard length due to the influence of drawing can be eliminated.

Further, since it suffices to connect the flat cable bundle to the flat cable connecting portion, the work can be carried out easily and surely. Therefore, it has the effects of preventing wire breakage, improving workability, and shortening the hard length.

By the way, as described above, a forceps port 25 for inserting a treatment tool is provided on the lower side of the grip portion 22 of the operation portion 8.
Is provided. The forceps port 25 communicates with a tip opening 24b provided in the tip 12 through a suction conduit in the insertion section 7.

A light guide bundle and tubes are arranged in the insertion portion 7, and in particular, the light guide bundle has a sufficient number for observation and treatment.

Therefore, it is one of the factors that determine the outer diameter of the insertion portion 7, and it becomes difficult to reduce the outer diameter of the insertion portion 7. In order to eliminate or reduce this, the second light source device 74 may be used as described below to illuminate the forceps port 25 through the light guide bundle 75.

FIG. 19 shows a second light source device 74 and this second light source device 74.
Shows a set having a light guide bundle 75 that can be connected to the light source device 74 of FIG. FIG. 20 shows an endoscope system 1 ′ that inserts the light guide bundle 75 connected to the second light source device 74 into the forceps port 25 of the operation unit 8 and projects from the tip opening 24 b to perform illumination.

In this system 1 ', by inserting a preliminary light guide bundle 75, the light guide bundle in the insertion portion 7 can be made thin, thereby making it possible to reduce the diameter of the insertion portion 7 and the light guide bundle 75. It is possible to observe while ensuring sufficient brightness with the illumination. Therefore, according to such a configuration, there is an effect that the diameter of the insertion portion 7 can be reduced. It should be noted that if the outer diameter of the light guide bundle 75 is made larger than the outer diameter of the light guide bundle in the insertion portion 7, the insertion portion 7
It is possible to reduce the diameter. The embodiments and the like configured by partially combining or extracting a part of the above-described embodiments and the like also belong to the present invention.

[Supplementary Notes] In an electronic endoscope having a built-in solid-state image sensor at the tip of the insertion section, a plurality of metal members arranged in the endoscope are connected to equipotential, and an electric signal from the solid-state image sensor is transmitted. An electronic endoscope characterized in that an electromagnetic interference countermeasure means provided in a signal cable is connected to the metal member so as to be equipotential to the metal member.

[0113] 2. The electronic endoscope according to claim 1, wherein the same structure is adopted in at least the universal cord.

3. The electronic endoscope according to claim 1, wherein the electromagnetic interference countermeasure means provided in the cable has a net tube structure made of an electric conductor.

4. In an imaging device having a solid-state imaging device (SID) and a SID cable composed of a plurality of signal cables, and an electromagnetic interference countermeasure means applied to the SID cable, a step of coating the electromagnetic interference countermeasure means on the outer surface of the hard pipe, , Step of inserting the locking wire into the rigid pipe and locking the SID cable at the locking part in front of the locking wire, and pulling out the rigid pipe after pulling the SID cable into the rigid pipe A method of mounting an electromagnetic interference countermeasure means in which the electromagnetic interference countermeasure means is attached to the outer surface of the SID cable by going through the steps.

5. In an electronic endoscope having a solid-state image sensor built in at the tip of the insertion section, a terminal processing section of an electromagnetic interference countermeasure means provided in a signal cable for transmitting an electric signal from the solid-state image sensor is provided in the operation section. An electronic endoscope characterized in that a loop portion is formed once or twice or more and is positioned near an intersection of signal cables generated by the loop formation.

[0117]

As described above, according to the present invention, in an electronic endoscope having a solid-state image pickup device built in at the distal end portion of the insertion portion, a plurality of conductive members arranged in the endoscope are equalized. While being connected to the electric potential, the electromagnetic interference countermeasure means provided in the signal cable for transmitting the electric signal from the solid-state image sensor is connected to the conductive member to have the same electric potential as the conductive member. Noise emission and noise intrusion can be reduced, and a large capacitance is formed by making the potential equal to the electromagnetic interference countermeasure means. This large capacitance also reduces noise emission and noise intrusion. it can.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an endoscope apparatus including a first embodiment of the present invention.

FIG. 2 is an external view of an electronic endoscope provided with the first embodiment of the present invention.

FIG. 3 is a configuration diagram of an electric system of the electronic endoscope.

[Fig. 4] S at the connecting portion between the operation portion and the universal cord portion
The figure which shows the mode of insertion of an ID cable.

FIG. 5 is a diagram showing a distal end side of an insertion portion of the electronic endoscope.

FIG. 6 is a sectional view showing the structure of an imaging unit.

FIG. 7 is a cross-sectional view showing a structure of a scope connector section.

FIG. 8 is a perspective view showing the shape of a partition cylinder.

FIG. 9 is a schematic diagram showing the structure of an SID cable.

FIG. 10 is an explanatory diagram showing how the SID cable is covered with a third shield.

FIG. 11 is a view showing that the SID cable is passed through the noise reducer in a loop shape.

FIG. 12 is a diagram showing an SID cable that is passed through a noise reducer according to a modification of FIG. 11.

FIG. 13 is an explanatory diagram of a method of covering the SID cable with a shield material.

FIG. 14 is a diagram showing how an SID cable is inserted at a connection portion between an operation portion and a universal cord portion according to the second embodiment of the present invention.

FIG. 15 is a view showing a means for avoiding scraping on the way to FIG.

FIG. 16 is a diagram showing a structure on a tip side of an SID cable according to a third embodiment of the present invention.

FIG. 17 is a sectional view showing the structure of an imaging unit.

FIG. 18 is a diagram showing the distal end side of the insertion portion of the electronic endoscope.

FIG. 19 is a diagram showing a second light source device and a light guide bundle.

FIG. 20 is a diagram showing an endoscope system configured by inserting a light guide bundle connected to a second light source device from a forceps port.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Endoscope system 2 ... Electronic endoscope 3 ... Light source device 4 ... Scope cable 5 ... Video processor 6 ... Monitor 7 ... Insertion part 8 ... Operation part 9 ... Universal cord part 10 ... Scope connector part 11 ... Noise reducer 12 ... Tip part 13 ... Bending part 17 ... Switch part 18 ... Light guide 19 ... Objective lens 20 ... SID cable 21 ... SID 25 ... Forceps mouth 26 ... Third shield 27 ... Core wire 28 ... First shield 29 ... Second Shield 30 ... Coaxial line 31 ... First patient circuit 32 ... First patient circuit GND 33 ... Second patient circuit 34 ... Second patient circuit GND 37 ... Switch signal line 40 ... Scope exterior conductive member 86 ... Imaging unit

Claims (1)

[Claims] 1. An electronic endoscope having a solid-state imaging device built in at the tip of an insertion portion, wherein a plurality of conductive members disposed in the endoscope are connected to equipotential and An electronic endoscope in which an electromagnetic interference countermeasure means provided in a signal cable for transmitting the electric signal is connected to the conductive member so as to have the same potential as the conductive member.