JP5525780B2 - Electronic endoscope device - Google Patents

Description

  The present invention relates to an electronic endoscope apparatus that includes an insertion portion, and particularly has an imaging device built in a distal end portion of the insertion portion.

  In recent years, endoscopes have been widely used in the medical field and the industrial field. In the conventional endoscope apparatus, an image guide is used, and what can observe the inside of a patient's body cavity, the inside of a jet engine, or the like at an eyepiece portion that a user looks into has been the mainstream. In addition, recent endoscope apparatuses incorporate an imaging apparatus, take an image of a patient's body cavity, the inside of a jet engine, or the like, and display an endoscopic image on a display device such as an external monitor. Has appeared.

  By the way, since a medical endoscope apparatus is inserted into a living body, it may be subjected to high-temperature and high-pressure sterilization (autoclave sterilization) before and after use. An endoscope apparatus is composed of many parts, and there is a possibility that steam, chemicals, etc. may invade from a part assembly part during high-temperature and high-pressure sterilization processing. When steam, chemicals, or the like enter, internal components may corrode, and in particular, metal components constituting the electromagnetic shield cause a reduction in the electromagnetic shielding effect. Furthermore, intrusion of steam, chemicals, or the like may cause problems due to short circuiting of the electronic circuit or increase in the impedance of the part coupling portion.

  For example, Patent Document 1 proposes an endoscope in which an electrical circuit is detachably disposed as a cartridge type in a connector portion connected to a video processor or an operation portion. In this conventional endoscope, the electric circuit cartridge is formed in a steam-resistant seal structure, and is configured to cope with a high-temperature and high-pressure steam sterilization process particularly when used for medical purposes.

  Endoscope devices are not limited to medical use, and an imaging device is often arranged at the distal end of the insertion section. The length of the insertion section and the length of the composite cable for connecting to a video processor, etc. Accordingly, the transmission path for transmitting and receiving the endoscope image signal and the like becomes a long distance. As described above, the image signal of the endoscope apparatus having a long transmission path is likely to cause image quality degradation due to waveform rounding during transmission and image quality degradation due to external electromagnetic noise.

  In the endoscope of Patent Document 1 described above, the electric circuit cartridge that is detachable from the operation unit serves as a relay circuit in the transmission path for transmitting and receiving the endoscope image signal and the like, and thus noise is generated in the endoscope image signal. It is conceivable that the electromagnetic interference of

  As another technique for preventing electromagnetic interference, for example, Patent Document 2 proposes a reinforcing structure for a seal portion of an endoscope. This conventional endoscope is provided with a rigid member that surrounds a wiring board disposed in an outer wall part and serves as a shield member for electromagnetic shielding. In this patent document 2, a rigid member is disposed in an outer wall part to propose a reinforcing structure for a seal portion of an endoscope.

Japanese Patent Laid-Open No. 09-10166 Japanese Patent Application Laid-Open No. 09-253027

  However, since the endoscope of Patent Document 1 is in the form of an electric circuit cartridge that is detachable from the operation unit, the endoscope does not have a structure for waterproofing the electric contact portion between the operation unit and the electric circuit cartridge. When sterilizing with an apparatus, there is a problem that these electric contact portions are exposed to high-pressure steam.

  Furthermore, in the endoscope of Patent Document 1, when the electric circuit cartridge is attached to the operation unit, the entire operation unit becomes large. As described above, when an operation unit that is gripped and used by a user becomes large, a conventional endoscope has a poor operability and is not easy to use, and is also inconvenient for a female user, a user with a small hand, and the like. End up. Furthermore, the weight of the endoscope itself increases, and there is a problem that a load on the user is given.

  In addition, in the reinforcement structure of the seal part of the endoscope of Patent Document 2, the space inside the exterior component is restricted by the rigid member disposed in the exterior component, and a space for arranging other built-in components is also required. For this reason, the exterior parts have to be enlarged excessively.

  Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is an endoscope that reduces noise of various signals due to electromagnetic interference and prevents deterioration in operability due to enlargement. Is to provide a device.

In order to achieve the above object, an electronic endoscope apparatus according to an aspect of the present invention includes an insertion portion in which an imaging device is built in a distal end portion, an operation portion connected to the insertion portion, and a connection to the operation portion. An installed cable, a connector portion disposed at an extended end of the cable and connected to an external electrical device, and disposed in the operation portion, and exchanges various signals between the imaging device and the electrical device. A plurality of circuit board portions having circuit configurations divided according to different properties of the various signals, and an electromagnetic shielding shield integrally formed on the exterior of the operation portion so as to cover the plurality of circuit board portions , An electromagnetic shielding box having a plurality of recesses disposed so that each of the plurality of circuit board portions is electromagnetically shielded from each other .

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the noise of the various signals by an electromagnetic failure, the endoscope apparatus which prevented the deterioration of operativity by enlargement can be provided.

The figure which shows the whole structure of the electronic endoscope system which concerns on the 1st Embodiment of this invention. Sectional drawing schematically showing the configuration of the electronic endoscope system Sectional drawing schematically showing the operation unit FIG. 4 is a partial cross-sectional view showing a part of the operation unit having a three-layer structure of the operation unit exterior, the electromagnetic shielding shield, and the insulating layer of the modification. The perspective view which shows the electromagnetic shielding shield of the metal mesh frame of a modification The figure which shows the connection of the electrical shield of the endoscope system and the ground The fragmentary sectional view which shows the arrangement configuration of the electronic circuit board in the operation part of 1st form concerning the 2nd Embodiment of this invention. VIII-VIII sectional view of FIG. The side view which shows the arrangement configuration of the electronic circuit board in the operation part of a 2nd form same as the above FIG. 9 is a top view showing the arrangement configuration of the electronic circuit board in the operation unit of FIG. The top view which shows the arrangement configuration of the electronic circuit board in the operation part of the third embodiment. FIG. 11 is a side view showing the arrangement configuration of the electronic circuit board in the operation unit of FIG. The fragmentary sectional view which shows the arrangement configuration of the electronic circuit board in the operation part of a 4th form similarly FIG. 13 is a side view showing the arrangement configuration of the electronic circuit board in the operation unit of FIG. The top view which shows the arrangement configuration of the electronic circuit board in the operation part of a 5th form same as the above FIG. 15 is a side view showing the arrangement configuration of the electronic circuit board in the operation unit of FIG. The top view which shows the arrangement configuration of the electronic circuit board in the operation part of a 6th form same as the above FIG. 17 is a side view showing the arrangement configuration of the electronic circuit board in the operation unit of FIG.

  Hereinafter, an endoscope apparatus according to the present invention will be described with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6 relate to the first embodiment of the present invention, FIG. 1 is a diagram showing the overall configuration of the electronic endoscope system, and FIG. 2 is a schematic configuration of the electronic endoscope system. FIG. 3 is a cross-sectional view schematically showing the operation unit, FIG. 4 is a partial cross-sectional view showing a part of the operation unit with a three-layer structure of the operation unit exterior, the electromagnetic shielding shield, and the insulating layer of the modified example, FIG. 5 is a perspective view showing an electromagnetic shielding shield of a metal mesh frame according to a modified example, and FIG. 6 is a diagram showing the connection between the electrical shield and the ground of the endoscope system.

  As shown in FIG. 1, an electronic endoscope system (hereinafter simply referred to as an endoscope system) 1 includes an electronic endoscope device (hereinafter simply referred to as an endoscope) 2, a light source device 3, and a video processor 4. And the monitor 5.

  The endoscope 2 includes a long and narrow insertion portion 9, an operation portion 10, and a universal cord 17 that is a cable that includes an electric signal transmission cable, a light guide, and the like. The insertion portion 9 of the endoscope 2 includes a distal end portion 6, a bending portion 7, and a flexible tube portion 8 in order from the distal end.

  The operation unit 10 is connected to one end of the flexible tube unit 8 of the insertion unit 9, and is an opening portion of a treatment instrument channel through which the folding unit 11 and various treatment instruments disposed in the insertion unit 9 are inserted. The treatment instrument channel insertion portion 12 and the operation portion main body 13 are provided.

  The operation portion main body 13 is provided with a bending operation knob 16 for bending the bending portion 7 of the insertion portion 9, and is provided with switches and the like for various endoscope functions. In the bending operation knob 16, a UD bending operation knob 14 for bending the bending portion 7 in the up / down direction and an RL bending operation knob 15 for bending the bending portion 7 in the left / right direction are superimposed. It is arranged.

  The universal cord 17 that is a cable that transmits electricity and illumination light extended from the operation unit 10 has an endoscope connector 18 that is a connector unit that is detachable from the light source device 3 at the extended end. The endoscope 2 according to the present embodiment emits illumination light from the light source device 3 to the distal end portion 6 by a light guide bundle (not shown) that is inserted into the universal cord 17, the operation unit 10, and the insertion unit 9. It is configured to transmit.

  The endoscope connector 18 is extended with a coil cable 19 connected via a detachable electrical connector 20a. In addition, the coil cable 19 is provided with an electrical connector 20a that is detachable from the video processor 4 at the extended end.

  The video processor 4 is electrically connected to a monitor 5 that displays an endoscopic image, and performs signal processing on an endoscopic image signal that has been photoelectrically converted by an imaging device (to be described later) of the endoscope 2. Then, the video processor 4 outputs an image signal to the monitor 5 to display an endoscopic image on the monitor 5.

  As shown in FIG. 2, the endoscope 2 of the endoscope system 1 is provided with an imaging device 21 in the distal end portion 6 of the insertion portion 9. The imaging device 21 is provided with an objective lens group (not shown), and detects solid-state imaging elements such as a CCD and a CMOS (hereinafter referred to as the present embodiment) that detect and photoelectrically convert photographing light condensed on the objective lens group. (In the form, it is a CCD) 22.

  The bending portion 7 of the insertion portion 9 is provided with a plurality of bending pieces (not shown) that are rotatably connected to each other. A flexible bending rubber 31 is coated on the outer periphery of the plurality of bending pieces. Further, the plurality of bending pieces are rotated by pulling and loosening a plurality of bending operation wires (not shown) by the operation of the UD bending operation knob 14 and the RL bending operation knob 15 of the operation unit 10. 7 curves in four directions, up, down, left and right. The bending portion 7 is connected to the distal end portion 6 in a watertight or airtight manner at the outer peripheral portion of the curved rubber 31 by, for example, pincushion bonding.

  The flexible tube portion 8 of the insertion portion 9 includes, for example, a braided blade 33 serving as an electromagnetic shielding shield made of metal, and a flex tube (such as a spiral tube body) in an outer sheath (sheath) 32 that is an exterior covering body. (Not shown) is interpolated. The blade 33 is also extended in the curved portion 7, and is electrically connected to a metal tip constituting portion 6a that also serves as an electromagnetic shielding shield. The tip configuration portion 6 a mainly constitutes an exterior portion of the tip portion 6. The flexible tube portion 8 is connected to the operation portion 10 at the base end portion. The above-described folding preventing portion 11 is fitted and covered with the outer peripheral portion of the connection between the flexible tube portion 8 and the operation portion 10.

  The operation unit 10 is a member constituting the operation unit main body 13 and includes an operation unit exterior 34 formed of a synthetic resin that is an insulator. On the inner surface of the operation unit exterior 34, for example, an electromagnetic shielding shield 35 that forms a metal conductive film such as copper or aluminum is formed.

Here, the electromagnetic shielding shield 35 provided on the inner surface of the operation unit exterior 34 of the operation unit 10 will be described.
As described above, the electromagnetic shielding shield 35 is formed as a metal thin film by depositing a metal such as copper or aluminum on the inner surface of the operation unit exterior 34 by vapor deposition. In addition to forming the electromagnetic shielding shield 35 as a thin film on the inner surface of the operation unit exterior 34 by vapor deposition, the operation unit 10 may adhere a conductive thin film sheet to the inner surface of the operation unit exterior 34. Further, the operation unit 10 may be formed by, for example, two-color formation (double mold) using an insulating resin that forms the operation unit exterior 34 and a conductive resin that forms the electromagnetic shielding shield 35.

In addition, since the electromagnetic shielding shield 35 is exposed inside the operation unit 10, it is insulated from the surface of the electromagnetic shielding shield 35 (the inner surface of the operation unit 10) in order to maintain insulation from electrical components in the operation unit 10. The conductive film 39 may be formed as a thin film (see FIG. 4 ). In this case, the operation unit 10 has a three-layer structure including an operation unit exterior 34, an electromagnetic shielding shield 35, and an insulating film 39.

Further, as shown in FIG. 5 , the electromagnetic shielding shield 35 is formed of, for example, a net-like metal frame member formed in accordance with the shape of the operation unit 10, and the operation unit exterior 34 is configured around the metal frame member. The operation unit 10 may be formed by fleshing synthetic resin or the like that is a non-conductive material. Moreover, the metal frame member can select the frequency which electromagnetically shields by changing the width | variety of a mesh, or carrying out press molding. Thus, the mechanical strength of the operation unit exterior 34 can be improved by providing the operation unit 10 with the metal frame member.

  Returning to FIG. 2, a plurality of, in this case, three, electric circuit board portions 41 to 43 serving as the relay circuit of the present embodiment are provided in the operation unit 10 configured as described above.

  One of the electric circuit board portions 41 to 43, here, the electric circuit board portion 41 located on the distal end side, is connected to the CCD 22 at the distal end portion 6 with a composite cable 23 for transmitting and receiving various signals via a connector. Connected. In addition, adjacent ones of the electric circuit board portions 41 to 43 are connected by an electric cable (composite cable) such as a flexible printed board. And the electric circuit board | substrate part 43 located in a base end side is connected to the composite cable 24 for transmitting / receiving various signals via a connector. The composite cable 24 is inserted and arranged in the universal cord 17, extends to the endoscope connector 18, and is electrically connected to the coil cable 19 via the electrical connector 20 a.

  Each of the electric circuit board portions 41 to 43 includes, for example, a noise cancellation circuit, an amplification processing circuit that amplifies a waveform rounding due to image signal degradation to a normal waveform, an A / D conversion circuit, and a D / A conversion circuit. The mounted electronic component is mounted. These three electric circuit board portions 41 to 43 are divided into circuit configurations for processing various signals having different properties. Various signals with different properties include, for example, an analog signal and a digital signal, as well as an output signal system, an input signal system, a drive signal, a control signal, a power supply signal, and the like. You may classify according to the ease of being affected.

  The electric circuit board 42 in the center includes a high-speed processing circuit for processing a high-frequency endoscope image signal as the number of pixels of the captured image acquired by the CCD 22 increases. Covered by an electromagnetic shielding case.

  Further, these three electric circuit board portions 41 to 43 are insulated and supported by the studs 41a to 43a in an electromagnetic shielding box 44 formed of, for example, gold, silver, copper, aluminum, or ceramic mixed with metal particles. It arrange | positions in the state (refer FIG. 3). The electromagnetic shielding box 44 has three recesses 44a to 44c. Any one of the three electric circuit board portions 41 to 43 is disposed inside each of the concave portions 44a to 44c. Thereby, each electric circuit board part 41-43 is mutually shielded electromagnetically by the wall part containing the metal formed of recessed part 44a-44c, respectively, and each crosstalk noise etc. are prevented. Note that the substrate 41 may be strengthened by standing the studs 41 a to 43 a directly on the support plate 45 and connecting the GND of the substrate to the studs 41 a to 43 a and the support plate 45.

  The electromagnetic shielding box 44 is supported and fixed via a plurality of studs 45 a on an insulating support plate 45 fixed to the operation unit exterior 34 in the operation unit 10. The electromagnetic shielding box 44 is electrically connected to the electromagnetic shielding shield 35 having a coating formed on the inner surface of the operation unit exterior 34 and the GND wire 25.

  Moreover, as shown in FIG.2, FIG.3 and FIG.6, each unit (here, it is) in the connection part of the flexible tube part 8 of the insertion part 9 provided in parallel with the operation part 10, and the universal cord 17. The tip 6, the bending portion 7, the flexible tube portion 8, the operation portion 10, the universal cord 17, and the endoscope connector 18) are kept watertight or airtight, and the electromagnetic shielding shield of each unit is electrically A unit connecting member 50 constituting unit connecting means to be connected is provided.

  The unit connection member 50 has an annular connection base 51 formed of a metal such as copper or aluminum, or a member having conductivity. Further, the unit connecting member 50 includes an electromagnetic shielding gasket 52, which is an electromagnetic shielding member having conductivity, and watertightness in two circumferential grooves formed at different positions along the axial direction of the connection base 51. Alternatively, a sealing member 53 such as an O-ring that is an airtight holding member is provided.

As shown in FIG. 3, the unit connecting member 50 includes the flexible tube portion 8 such that the electromagnetic shield gasket 52 is located on the inner side of the operation portion 10 and the seal member 53 is located on the outer side of the operation portion 10. Is provided in a connection portion between the flexible tube portion 8 and the operation portion 10.
Specifically, the connection cap 51 of the unit connection member 50 is fitted into the flexible tube portion 8 so that the outer peripheral portion of the tip portion is inserted into and contacted with the blade 33 of the flexible tube portion 8. Thereby, the connection cap 51 and the blade 33 are electrically connected.

  The connection base 51 is fitted with the base end portion inserted into the operation unit 10. In this state, the electromagnetic shielding gasket 52 provided on the connection base 51 is in close contact with the electromagnetic shielding shield 35 of the operation unit 10. Further, the seal member 53 provided in the connection base 51 is in close contact with the inner surface of the operation unit exterior 34 of the operation unit 10.

  That is, the blade 33 of the flexible tube portion 8 and the connection cap 51 of the unit connection member 50 are electrically connected by fitting. In addition, the electromagnetic shielding shield 35 of the operation unit 10 and the connection cap 51 of the unit connection member 50 are electrically connected via the electromagnetic shielding gasket 52 that is in close contact with each other. As a result, the blade 33 of the flexible tube 8 and the electromagnetic shielding shield 35 of the operation unit 10 are electrically connected via the unit connection member 50.

  The operation unit 10 does not have the electromagnetic shielding shield 35 formed on the inner surface of the end (tip side) connected to the flexible tube unit 8 via the unit connection member 50, and the inner surface of the operation unit exterior 34. Is exposed in a predetermined range. The seal member 53 of the unit connection member 50 is brought into close contact with the exposed inner surface of the operation unit exterior 34, and watertightness or airtightness between the unit connection member 50 and the operation unit 10 is maintained.

  Similarly to the above, the unit connection member 50 is provided in the connection part of the operation part 10 and the universal cord 17, and is arrange | positioned so that the operation part 10 and a universal cord may be fitted (refer FIG. 2).

  Here again, the connection cap 51 of the unit connection member 50 is connected to the universal cord 17 so that the outer peripheral portion of the tip portion is inserted and contacted with the metal sheath 37 in the cord formed of aluminum or the like of the universal cord 17. The Thereby, the connection cap 51 and the metal sheath 37 are electrically connected.

  The connection base 51 is fitted with the base end portion inserted into the operation unit 10. Even in this state, the electromagnetic shielding gasket 52 provided in the connection base 51 is in close contact with the electromagnetic shielding shield 35 of the operation unit 10, and the seal member 53 provided in the connection base 51 is in the operation unit exterior 34 of the operation unit 10. It will be in the state closely_contact | adhered with the inner surface of. Accordingly, the metal sheath 37 of the universal cord 17 and the electromagnetic shielding shield 35 of the operation unit 10 are electrically connected via the unit connection member 50.

  In this case as well, the operation unit 10 has no electromagnetic shielding shield 35 formed on the inner surface of the end (tip side) connected to the universal cord 17 via the unit connection member 50, The surface is exposed in a predetermined range. The seal member 53 of the unit connection member 50 is brought into close contact with the exposed inner surface of the operation unit exterior 34, and watertightness or airtightness between the unit connection member 50 and the operation unit 10 is maintained.

  Further, as shown in FIG. 6, the unit connecting member 50 is also provided in the joint portion between the distal end portion 6 and the bending portion 7 of the insertion portion 9 and in the joint portion between the universal cord 17 and the endoscope connector 18. Yes. That is, the joint between the distal end portion 6 and the bending portion 7 is in a state of being connected in a watertight or airtight manner by the unit connecting member 50 and constitutes an electromagnetic (electrostatic) shielding shield that covers the imaging device 21. The tip constituting portion 6a is electrically connected to the blade 33 constituting the electromagnetic (electrostatic) shielding shield provided integrally in the bending portion 7 and the flexible tube portion 8. The joint between the universal cord 17 and the endoscope connector 18 is also connected to the unit connector 50 in a watertight or airtight manner, and is an electromagnetic shielding shield that covers the electronic components in the endoscope connector 18. The connector shield 18a and the metal sheath 37 of the universal cord 17 are electrically connected.

  The connector shield 18 a of the endoscope connector 18 is electrically connected to the housing ground 4 a constituting the electromagnetic (electrostatic) shielding shield in the video processor 4 via the coil cable 19. A housing ground 4 a in the video processor 4 is grounded via a ground (GND) cable 29.

  As described above, the endoscope 2 includes the distal end constituting portion 6a of the insertion portion 9, the blade 33 of the insertion portion 9, the electromagnetic shielding shield 35 of the operation portion 10, the metal sheath 37 of the universal cord 17, and the endoscope connector 18. The connector shield 18a is electrically connected via a unit connection member 50 disposed at each joint. As a result, the endoscope 2 is electrically connected to the entire electromagnetic shielding shield (electrostatic shielding shield) for preventing transmission and reception of electromagnetic waves and static electricity, and the entire interior is electrically connected to the electromagnetic shielding shield (static The structure is shielded by an electric shielding shield.

  The endoscope 2 is electrically connected to the video processor 4 via the coil cable 19 and the endoscope connector 18 via the casing ground 4 a and ground (GND) cable 29 of the video processor 4. Thus, the entire electromagnetic shielding shield (electrostatic shielding shield) is grounded.

  Furthermore, the endoscope 2 includes a distal end portion 6 and a bending portion 7 in the insertion portion 9, a flexible tube portion 8 and an operation portion 10, an operation portion 10 and a universal cord 17, and a universal cord 17 and an endoscope connector 18. The unit connection member 50 provided in the joint portion of each unit is connected in a watertight or airtight manner and connected.

  As described above, in the endoscope system 1 according to the present embodiment, the imaging device 21 disposed at the distal end portion 6 of the insertion portion 9 and the video processor 4 exchange signals such as an endoscope image signal. Since the transmission path becomes a long distance, the electric circuit board portions 41 to 43 are provided in the operation portion 10. That is, in the endoscope system 1, since the radiated electromagnetic wave becomes larger as the total length of the signal transmission path is longer, the electric circuit board parts 41 to 43 are provided in the operation unit 10 so that the signal transmission path is shorter. The radiated electromagnetic wave is configured to be small.

  Thereby, the endoscope 2 of the endoscope system 1 can be configured to prevent electromagnetic disturbance such as noise in the endoscope image signal with particularly high image quality. That is, since the high-quality endoscopic image signal has a higher impedance as the frequency becomes higher, various noises including common mode noise greatly influence and cause radiated electromagnetic waves. The electric circuit board portions 41 to 43 are provided to shorten the signal transmission path, thereby reducing the influence of electromagnetic interference.

  With such a configuration, the endoscope 2 has an electromagnetic shielding shield 35 formed on the operation portion exterior 34 that covers the electric circuit board portions 41 to 43 inside the operation portion 10. The electromagnetic shielding shield 35 is configured in consideration of the electromagnetic environment compatibility (EMC) of each of the electric circuit board portions 41 to 43. That is, the endoscope 2 prevents the electromagnetic wave resistance in the operation unit 10 provided with the electric circuit board units 41 to 43 from being lowered by forming an electromagnetic shielding shield 35 on the operation unit exterior 34. In other words, the endoscope 2 has an electromagnetic susceptibility (EMS) in which an electromagnetic shielding shield 35 is formed on the operation unit exterior 34 to prevent an electromagnetic disturbance in an endoscope image signal or the like due to an external electromagnetic wave. Furthermore, it has a configuration that does not give an electromagnetic influence (EMI) to an external device.

  Further, since the endoscope 2 has the electromagnetic shielding shield 35 formed on the operation portion exterior 34, it is not necessary to provide a metal shield frame or the like that covers each of the electric circuit board portions 41 to 43 as a separate body. It can be set as the structure which suppressed the enlargement of the part 10 and the weight. Thereby, the endoscope 2 can suppress the operability by the user and the poor usability as a configuration that suppresses the increase in size of the operation unit 10 held by the user. Moreover, the endoscope 2 can also suppress a load applied to the user as a configuration in which an increase in the weight of the operation unit 10 is suppressed.

  Furthermore, as described above, the endoscope 2 is provided with the unit connection member 50 in the joint portion of each unit such as the insertion portion 9, the operation portion 10, and the universal cord 17, and is entirely watertight or airtight. Connected with. Thereby, the endoscope 2 has a watertight or airtight structure in which steam, chemicals and the like are prevented from entering from the joint portion of each unit during the high temperature and high pressure sterilization process (autoclave sterilization).

  As described above, the endoscope 2 according to the present embodiment has a configuration in which the unit connection member 50 for electrically connecting the electromagnetic (electrostatic) shielding shield and watertight or airtight holding connection is provided at the joint portion of each unit. The entire electromagnetic (electrostatic) shielding shield is configured to be stably grounded (GND) via the video processor 4. In the endoscope 2, stray capacitance generated between the surrounding members and the shielding member cannot be ignored, and an unintended loop may be formed in the electronic circuit. Therefore, by stabilizing the GND, The noise of the endoscope image signal can be reduced.

  Further, in parts other than the electronic circuit provided in the endoscope 2 (not shown, such as a light guide, various channels, and an air / water supply tube), an electromagnetic wave such as a ferrite sheet is present at a place where interference with other members is small. You may wind the member which absorbs.

(Second Embodiment)
Next, various arrangement configurations of the electronic circuit board provided in the operation unit 10 will be described below. FIGS. 7 to 18 relate to the second embodiment, FIG. 7 is a partial cross-sectional view showing the arrangement configuration of the electronic circuit board in the operation unit of the first form, FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 9 is a side view showing the arrangement configuration of the electronic circuit board in the operation unit of the second embodiment, FIG. 10 is a top view showing the arrangement configuration of the electronic circuit board in the operation unit of FIG. 9, and FIG. 11 is in the operation unit of the third embodiment. FIG. 12 is a side view showing the arrangement configuration of the electronic circuit board in the operation section of FIG. 11, and FIG. 13 shows the arrangement configuration of the electronic circuit board in the operation section of the fourth embodiment. FIG. 14 is a side view showing the arrangement configuration of the electronic circuit board in the operation section of FIG. 13, FIG. 15 is a top view showing the arrangement configuration of the electronic circuit board in the operation section of the fifth embodiment, and FIG. The side view which shows the arrangement configuration of the electronic circuit board in the operation part of FIG. 17, FIG. Top view showing an arrangement of an electronic circuit board in the operation portion, FIG. 18 is a side view showing the arrangement of an electronic circuit board in the operation portion of Fig. 17.

  First, as illustrated in FIG. 7, the operation unit 10 includes operation unit exteriors 34 a and 34 b that are divided into two parts. The electronic circuit board 61 is formed in an L shape so that the electronic circuit board 61 can be disposed so as to be caught in the opening of the one operation unit exterior 34b. This electronic circuit board 61 is fixed by an operation part component support member 62 and one screw 63 arranged in parallel in the operation part 10.

  When two screws 63 for fixing the electronic circuit board 61 to the component supporting member 62 in the operation unit are used, the electronic circuit board 61 can be stably fixed to the component supporting member 62 in the operation unit, but the space for mounting and arranging the electronic component is reduced. End up. For this reason, here, the electronic circuit board 61 is L-shaped and hooked and fixed to the opening of the operation portion exterior 34b.

  As a result, the electronic circuit board 61 can be fixed to the in-operation-part component support member 62 with a single screw 63. Further, since the electronic circuit board 61 is disposed so as to be hooked on the opening portion of the operation portion exterior 34b, the electronic circuit board 61 is prevented from rotating around the screw 63.

  The operation unit 10 has an elongated shape. In many cases, it is a good design measure to make the electronic circuit board 61 into an elongated shape in accordance with the shape of the operation unit 10. Therefore, if the electronic circuit board 61 has an elongated shape, it is necessary to increase the number of screws 63 for fixing to the operation part component support member 62. When the number of screws 63 increases, the space for mounting and arranging the electronic components decreases. Furthermore, when the electronic circuit board 61 is fixed to the operation part component support member 62 with a small number of screws 63, the electronic circuit board 61 may be bent. Therefore, as shown in FIG. 8, a step may be provided on the operation unit exterior 34 b to hold the electronic circuit board 61 in the gravity direction.

  Further, when the electronic circuit board 61 is fixed by setting the stud 63a on the component supporting member 62 in the operation portion, if the number of fixing screws 63 is large, a large number of assembly steps are required. Therefore, as shown in FIG. 9 and FIG. 10, an abutment surface 64 for abutting and holding one end of the electronic circuit board 61 is provided on the in-operation-part component support member 62, and there is only one fixing screw 63. The electronic circuit board 61 may be structured not to rotate around the screw 63.

  In addition, the operation unit 10 may be greatly moved by the user during the treatment, and the movement may cause a flexible substrate connected to the electronic circuit board 61 in the operation unit 10 to interfere with other cables, electric circuits, and the like. is there. Therefore, as shown in FIGS. 11 and 12, the flexible circuit board 66 connected to the electronic circuit board 61 via the connector 65 is bent so that it does not interfere with other members. The intra-part component support members 62 may be deformed and arranged in a space (gap) formed by being arranged in parallel. A cable 67 connected to the flexible board 66 is also arranged in a space formed between the electronic circuit board 61 and the operation part component support member 62.

  Further, in addition to the configuration shown in FIG. 11 and FIG. 12, the curved portion of the flexible substrate 66 is placed along the inner surface of the shield case 68 as shown in FIG. 13 and FIG. You may make it restrain movement. Also, a hole 68a is provided in the shield case 68, the cable 67 is extended from the shield case 68 through the hole 68a, and a cable fixing tool 69 is provided on one side of the shield case 68 to fix the cable 67. ing.

Further, the screw 63 for fixing the electronic circuit board 61 to the operation part component support member 62 is also a cause of reducing the installation space of the electronic component on the electronic circuit board 61. Therefore, in order to realize space saving as a configuration in which the screw 63 is not provided, as shown in FIGS. 15 and 16 , connectors fixed with screws, an adhesive or the like to both ends of the operation portion internal component support member 62. 71 may be provided, and both end portions of the electronic circuit board 61 may be fitted and held in groove-like engaging portions 72 formed in the connectors 71. In this state, in the electronic circuit board 61, the terminals provided at both ends corresponding to the terminals provided in the engaging portions 72 of the two connectors 71 are brought into contact with each other, and the two connectors 71 support the components in the operation unit. It is held parallel to the member 62. Each connector 71 is connected to a cable 67.

  Also, as shown in FIGS. 17 and 18, connectors 75 are also provided at both ends of the electronic circuit board 61, and connectors 71 provided on the operation part internal component support member 62 are fitted and connected to these connectors 75, It may be made conductive. Then, the shield GND of the electronic circuit board 61 may be dropped, that is, electrically conducted to the operation part component support member 62 via the connector 75 connected to the connector 71 of the operation part component support member 62.

  The invention described in each of the above-described embodiments is not limited to the embodiments and modifications, and various modifications can be made without departing from the scope of the invention in the implementation stage. is there.

DESCRIPTION OF SYMBOLS 1 ... Electronic endoscope system 2 ... Electronic endoscope apparatus 3 ... Light source device 4 ... Video processor 4a ... Case ground 5 ... Monitor 6 ... Tip part 6a ... Tip structure part 7 ... Curved part 8 ... Flexible tube part 9 ... Insertion part 10 ... Operation part 13 ... Operation part body 17 ... Universal cord 18 ... Endoscope connector 18a ... Connector shield 19 ... Coil cable 21 ... Imaging device 23, 24 ... Composite cable 29 ... Ground (GND) cable 33 ... Blade 34 ... Operation unit exterior 35 ... Electromagnetic shielding shield 37 ... Metal sheath 41, 42, 43 ... Electric circuit board 44 ... Electromagnetic shielding box 50 ... Unit connection member 51 ... Connection base 52 ... Electromagnetic shield gasket 53 ... Sealing member

Claims (9)

An insertion part in which an imaging device is built in the tip part;
An operation unit connected to the insertion unit;
A cable connected to the operation unit;
A connector portion disposed at an extended end of the cable and connected to an external electrical device;
A plurality of circuit board units arranged in the operation unit, for transmitting and receiving various signals between the imaging device and the electrical device, and having a circuit configuration divided according to different properties of the various signals ;
An electromagnetic shielding shield integrally formed on the exterior of the operation unit so as to cover the plurality of circuit board units ;
An electromagnetic shielding box formed with a plurality of recesses disposed so that each of the plurality of circuit board portions is electromagnetically shielded from each other;
An electronic endoscope apparatus comprising:   The electronic endoscope apparatus according to claim 1, wherein the electromagnetic shielding shield is a conductive film deposited on an inner wall surface of the operation unit.   The electronic endoscope apparatus according to claim 1, wherein an exterior of the operation unit is formed of two colors by a non-conductive resin and a conductive resin, and the conductive resin serves as the electromagnetic shielding shield.   2. The electronic endoscope apparatus according to claim 1, wherein a resin frame is formed on a metal frame member as an exterior of the operation unit, and the metal frame member serves as the electromagnetic shielding shield.   The insertion portion connected to the operation portion and the joint portion of the cable are provided respectively, and the blade of the insertion portion, the metal sheath of the cable, and the electromagnetic shielding shield of the operation portion are electrically connected The electronic endoscope apparatus according to any one of claims 1 to 4, further comprising a unit connecting member that connects and holds the joints. The unit connection member is a seal member that holds the blade or the metal sheath and the electromagnetic shielding shield electrically, and the operation portion and the insertion portion or the cable are watertight or airtight. And comprising
The electronic endoscope apparatus according to claim 5, wherein the electromagnetic shielding gasket is provided at the joint portion so as to be positioned inside the operation portion with respect to the seal member.   A tip configuration provided at the tip portion that electromagnetically shields the imaging device by holding each joint portion of the bending portion and the tip portion provided in the insertion portion, and the cable and the connector portion in a watertight or airtight manner, respectively. 7. The unit connecting member for electrically connecting the part and the blade, and the metal sheath and the connector shield provided in the connector part, respectively, is provided. The electronic endoscope apparatus described in 1.   The tip component portion, the blade, the electromagnetic shielding shield, the metal sheath, and the connector shield that are electrically connected by the unit connecting member are electrically connected to the ground of the external electrical device via the electrical cable. The electronic endoscope apparatus according to claim 5, wherein the electronic endoscope apparatus is connected. 2. At least one of the plurality of circuit board portions includes a high-speed processing circuit that processes an endoscope image signal of the imaging device, and is covered with a metal electromagnetic shielding case. The electronic endoscope apparatus according to claim 8.

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