JP6289137B2 - Electronic endoscope and endoscope apparatus - Google Patents

Description

  The present invention relates to an electric plug for an endoscope that connects an electronic endoscope to a video processor.

  2. Description of the Related Art An electronic endoscope that is inserted into a human body and captures an image in the body, and a video processor that receives an image from the electronic endoscope and performs image processing are known. The electronic endoscope and the video processor are connected by an endoscope connector including an endoscope electric plug and an electric plug insertion portion. The electric plug for endoscope includes a plug case made of conductive metal, and the plug case is inserted into the electric plug insertion portion (Patent Document 1).

JP 2006-95260 A

  However, when the plug case is completely inserted into the electric plug insertion portion, a part of the plug case may be exposed to the outside from the electric plug insertion portion. When a part of the plug case is exposed to the outside, if it is discharged from the outside to the plug case, electricity flows through the plug case to the electric parts of the electronic endoscope and the video processor, and the electric parts may be damaged. There is.

  The present invention has been made in view of these problems, and an object of the present invention is to obtain an endoscope electric plug that is less likely to receive external discharge.

  An electric plug for an endoscope according to the first invention of the present application is an electric plug for an endoscope that is inserted from the tip into an electric plug insertion portion, and is composed of a plug case made of a conductive metal and an insulator. An insulating portion that covers the entire outer periphery near the rear end of the case, and the insulating portion has an outer periphery larger than the outer periphery of the plug case when viewed from the insertion direction of the electric plug for the endoscope. Features.

  The electric plug insertion portion is a hole having a cylindrical shape, the plug case has a cylindrical shape, and is inserted into the inner peripheral side of the electric plug insertion portion, and the electric plug insertion portion has an opening portion and an opening portion. And the diameter of the opening is larger than the diameter of the engagement hole. When viewed from the insertion direction of the electric plug for endoscope, the diameter of the insulating portion is the diameter of the opening. And smaller than the diameter of the engagement hole. Insulation section ensures insulation performance.

  The insulating portion includes an insulating hole into which the rear end of the plug case is inserted, and an insulating flange extending radially outward from the periphery of the insulating hole, and the outer periphery of the insulating flange may be larger than the outer periphery of the plug case. preferable. Insulation flanges ensure insulation performance.

  It is preferable to further include a case lid to which the rear end of the plug case is attached, and the insulating portion is sandwiched between the plug case and the case lid. The insulating part can be fixed to the plug case and the case lid.

  The plug case may have a cylindrical shape having a flange projecting radially from the vicinity of the rear end of the plug case, and the insulating portion may be made of an insulator that covers the flange from the rear end of the plug case. . Insulation performance can be easily improved by applying an insulator.

  The insulating part further includes an insulating hole into which the rear end of the plug case is inserted, and the plug case includes an outer insertion part to be inserted into the insulating hole and a cut surface which is a flat surface provided on a side surface of the outer insertion part. The insulating hole is preferably provided on the inner peripheral surface and includes an engagement surface that engages with the cut surface. The plug case can be prevented from rotating with respect to the insulating portion.

  The plug case is provided with a recess recessed at the rear end thereof with respect to the insertion direction of the plug case. A protrusion projecting in the direction, and when the plug case and the insulating portion are combined, the protrusion may engage with the recess. The plug case can be prevented from rotating with respect to the insulating portion.

  An electronic endoscope according to a second invention of the present application is an electric plug for an endoscope that is inserted from the distal end into an electric plug insertion portion provided in a video processor, and is composed of a plug case made of a conductive metal and an insulator. And an insulating portion that covers the entire outer periphery near the rear end of the plug case, and the insulating portion has an outer periphery larger than the outer periphery of the plug case when viewed from the insertion direction of the electric plug for endoscope An electric plug for an endoscope is provided.

  An endoscope apparatus according to a third invention of the present application includes a video processor including an electric plug insertion portion, and an electronic endoscope including an endoscope electric plug inserted into the electric plug insertion portion from the distal end. The electric plug for a mirror includes a plug case made of a conductive metal and an insulating portion that covers the entire outer periphery near the rear end of the plug case. When viewed from the insertion direction, the insulating portion has an outer periphery larger than the outer periphery of the plug case.

  According to the present invention, an electric plug for an endoscope having a low possibility of receiving external discharge is obtained.

It is the figure which showed roughly the external appearance of the endoscope provided with the 1st electric plug for endoscopes by 1st Embodiment. It is a back perspective view of the 1st plug case. It is a front perspective view of the 1st insulating part. It is a back perspective view of the 1st insulating part. It is a front perspective view of a case lid. It is the front view which looked at the 1st plug case, the 1st insulating part, and the case lid from the axial direction outside of the 1st plug case. FIG. 7 is an end view of the first electric plug for endoscope inserted into the electric plug insertion portion, taken along line VII-VII in FIG. 6. FIG. 8 is an end view of the first endoscope electric plug taken along line VIII-VIII in FIG. 6. It is a back perspective view of the 2nd plug case. It is a front perspective view of the 2nd insulating part. It is a back perspective view of the 2nd insulating part. It is the front view which looked at the 2nd plug case, the 2nd insulating part, and the case cover from the axial direction outside of the 2nd plug case. It is an end elevation of the 2nd electric plug for endoscopes in the XIII-XIII line of Drawing 12. It is an end view of the 3rd electric plug for endoscopes inserted in the electric plug insertion part. It is an end view of the 4th electric plug for endoscopes inserted in the electric plug insertion part.

  Hereinafter, an endoscope apparatus 10 including a first endoscope electric plug 100 according to a first embodiment of the present invention will be described.

  The endoscope apparatus 10 includes an electronic endoscope 11 and a video processor 12.

  The electronic endoscope 11 mainly includes an insertion portion 13, a grip portion 14, a connection cable 15, and a connector 16.

  The insertion unit 13 includes an imaging element (not shown) at the tip, and is inserted into the human body. The imaging element images an observation object and outputs an image signal. The grip portion 14 includes a plurality of switches and the like, and is gripped by the user when used. The plurality of switches output operation signals according to user operations. The connection cable 15 electrically and optically connects the grip portion 14 and the connector 16.

  The connector 16 mainly includes an outer case 110 that stores a board (not shown), a first endoscope electric plug 100, and a light guide plug 17. The substrate receives the image signal and the operation signal from the imaging element and the plurality of switches, performs a predetermined process, and outputs the processed signal to the first endoscope electric plug 100. The opening of the outer case 110 is closed by the case lid 111.

  The first endoscope electric plug 100 mainly includes a first plug case 120 made of a conductive metal and a first insulating portion 130. A plurality of electrodes are attached inside the first plug case 120, and the electronic endoscope 11 and the video processor 12 are electrically connected via the plurality of electrodes. Details will be described later.

  The light guide plug 17 includes an optical fiber, optically connects the electronic endoscope 11 and the video processor 12, receives illumination light generated by the video processor 12, and includes a light (not shown) included in the electronic endoscope 11. It is transmitted to the guide fiber. The light guide fiber transmits illumination light to the tip of the insertion portion 13 and emits it toward the observation target.

  The video processor 12 mainly includes an electric plug insertion portion 20 and a light guide insertion portion 18. The electric plug insertion portion 20 is a hole having a cylindrical shape, includes a plurality of electrodes, and can receive the first electric plug 100 for an endoscope. The light guide insertion portion 18 can receive the light guide plug 17 and transmits illumination light to the light guide plug 17.

  The video processor 12 receives an image signal and an operation signal from the electronic endoscope 11 via the first endoscope electric plug 100 and the electric plug insertion unit 20, and performs predetermined processing. The direction in which the first endoscope electric plug 100 is inserted into the electric plug insertion portion 20 is the insertion direction of the first plug case 120.

  Next, the first endoscope electric plug 100 will be described with reference to FIGS. First, the first plug case 120 will be described with reference to FIG. FIG. 2 is a view of the first plug case 120 as seen from the back.

  The first plug case 120 is made of a conductive metal, and has a cylindrical plug cylinder 121, a cylindrical first outer insertion portion 122, two key grooves 123 that are concave portions, and two guide pins 124. Is mainly provided.

  The front end of the plug cylinder 121 forms a circular opening, and the rear end is closed by a rear end plate 125 that is a donut-shaped plate.

  The outer diameter of the first outer insertion portion 122 decreases stepwise from the rear end portion connected to the rear end plate 125 to the other front end portion. On the other hand, the inner diameter of the first outer insertion portion 122 is constant. The first outer insertion portion 122 has a plug cylinder 121 and a first outer insertion portion 122 so that the inner peripheral surface of the rear end plate 125 and the inner peripheral surface of the first outer insertion portion 122 coincide with each other. Are connected to the plug cylinder 121 so that their axes coincide with each other.

  The two key grooves 123 are formed by rolling the rear end plate 125 in the axial direction of the plug cylinder 121, and are provided at positions that are symmetric with respect to the axis of the plug cylinder 121. That is, the key groove 123 is recessed with respect to the insertion direction of the first plug case 120.

  The two guide pins 124 protrude in the radial direction from positions symmetrical with respect to the axis of the plug cylinder 121 on the side surface of the plug cylinder 121.

  Next, the first insulating portion 130 will be described with reference to FIGS. FIG. 3 is a view of the first insulating portion 130 as viewed from above the front, and FIG. 4 is a view of the first insulating portion 130 as viewed from above the back.

  The first insulating portion 130 is made of an electrically insulating resin, that is, an insulator, and includes a cylindrical insulating cylinder 131, an insulating flange 132, a key 133 that is a convex portion, and two circular holes 134. Prepare for.

  The insulating cylinder 131 includes a first insulating hole 136 inside. The insulating flange 132 protrudes in the radial direction from a part of the outer periphery of the insulating cylinder 131, that is, from the outer periphery near the front end surface 137.

  The diameter of the inner peripheral surface of the first insulating hole 136 is increased stepwise from the back end surface 135 of the insulating cylinder 131 toward the front end surface 137. The smallest diameter in the first insulating hole 136 and the diameter of the first insulating hole 136 in the back end surface 135 of the insulating cylinder 131 are slightly longer than the shortest outer diameter in the first outer insertion portion 122. The largest diameter in the first insulating hole 136 and the diameter of the first insulating hole 136 in the front end surface 137 of the insulating cylinder 131 are slightly longer than the diameter of the outer periphery of the plug cylinder 121.

  Two keys 133 are provided at positions that are symmetrical with respect to the axis of the insulating cylinder 131 on the inner peripheral surface of the first insulating hole 136 near the front end surface 137. The key 133 protrudes radially inward from the inner peripheral surface of the first insulating hole 136 and protrudes in the axial direction of the insulating cylinder 131. The length of the key 133 projecting radially inward from the inner peripheral surface of the first insulating hole 136 is slightly shorter than the length of the key groove 123 punched in the radial direction of the plug cylinder 121. The length of the insulating cylinder 131 protruding in the axial direction is slightly shorter than the length in which the key groove 123 is rolled in the axial direction of the plug cylinder 121.

  The two circular holes 134 are bottomed cylindrical holes formed in the back end surface 135 of the insulating cylinder 131, and the two circular holes 134 are provided at positions that are symmetric with respect to the axis of the insulating cylinder 131. . The axis of the circular hole 134 extends so as to be parallel to the axis of the insulating cylinder 131.

  Next, the case lid 111 will be described with reference to FIG. The case lid 111 mainly includes a lid portion 141 and an engaging portion 142.

  The lid portion 141 has a substantially rectangular parallelepiped plate shape, and has an outer peripheral shape in which corners are curved surfaces. The lid part 141 is provided with an engaging part 142.

  The engaging portion 142 mainly includes an outer receiving hole 143, an engaging guide 144, and two engaging protrusions 145. The outer receiving hole 143 is a cylindrical hole that penetrates and opens in the thickness direction of the lid 141, and the diameter is expanded in a stepped manner from the back side of the lid 141 toward the front side 146. The engagement guide 144 has an annular shape and protrudes from the lid portion 141 so that its axis coincides with the axis of the outer receiving hole 143. The diameter of the inner peripheral surface of the engagement guide 144 is longer than the diameter of the inner peripheral surface of the outer receiving hole 143. The two engaging protrusions 145 have a cylindrical shape and protrude in parallel with the axis of the outer receiving hole 143 from a position that is symmetrical with respect to the axis of the outer receiving hole 143 on the end surface 147 of the outer receiving hole 143.

  Next, the first plug case 120 and the first insulating portion 130 attached to the case lid 111 will be described with reference to FIGS. 6 is a front view of the first plug case 120, the first insulating portion 130, and the case lid 111 as viewed from the outside in the axial direction of the first plug case 120. FIG. FIG. 8 is an end view showing the first endoscope electric plug 100 inserted into the first endoscope, and FIG. 8 is an end view showing the first endoscope electric plug 100.

  First, the insides of the first plug case 120 and the outer case 110 will be described with reference to FIGS. A plurality of male terminals 151 and a harness 152 are mainly stored inside the first plug case 120, and a metal frame 153 is stored inside the outer case 110.

  When the first plug case 120 is viewed from the axial direction, the plurality of male terminals 151 are arranged to form a plurality of circles (see FIG. 6).

  The harness 152 includes a plurality of electric wires (not shown), and the plurality of electric wires are electrically connected to the plurality of male terminals 151.

  The metal frame 153 is electrically connected to the first plug case 120 and grounded. The substrate 154 is fixed to the metal frame 153.

  Next, the assembled state of the first plug case 120, the first insulating part 130, the case lid 111, and the outer case 110 will be described with reference to FIGS.

  The first outer insertion portion 122 is inserted into the first insulating hole 136 and the outer receiving hole 143 and protrudes from the back surface of the case lid 111. A male thread is cut on the outer periphery of the tip of the first outer insertion portion 122. The male screw portion is screwed with the nut 155. An insulating ring 157 made of an elastic member is attached to the entire outer periphery of the outer receiving hole 143. When the nut 155 is tightened, the insulating ring 157 is first contacted. When the nut 155 is further tightened, the nut 155 brings the insulating ring 157 into contact with the metal frame 153 while moving the insulating ring 157 in the axial direction. When the nut 155 is further tightened, the insulating ring 157 is elastically deformed, and the first insulating portion 130 is sandwiched and fixed between the rear end plate 125 and the front surface of the case lid 111. Thereby, the 1st plug case 120, the 1st insulation part 130, and the case cover 111 are fixed with respect to an axial direction.

  The two key grooves 123 engage with the two keys 133, respectively (see FIG. 7). As a result, the first plug case 120 does not rotate with respect to the first insulating portion 130. Further, the two engaging protrusions 145 are fitted into the two circular holes 134, respectively (see FIG. 8). Thereby, the first insulating part 130 does not rotate with respect to the case lid 111. The first plug case 120, the first insulating portion 130, and the case lid 111 are fixed in the radial direction by the key groove 123, the key 133, the engagement protrusion 145, and the circular hole 134.

  The case lid 111 is attached to the outer case 110 so as to cover the opening of the outer case 110, and is fixed with a screw or the like (not shown).

  An O-ring 156 is provided between the first insulating portion 130 and the first outer insertion portion 122, between the first insulating portion 130 and the case lid 111, and between the case lid 111 and the outer case 110, respectively. And the airtightness inside the first endoscope electric plug 100 is maintained.

  The electric plug insertion part 20 will be described with reference to FIGS. The electric plug insertion portion 20 includes a cylindrical opening 21 provided at an opening end thereof, and a cylindrical engagement hole 22 located deeper than the opening 21. The diameter of the opening 21 is larger than the diameter of the engagement hole 22. In addition, the diameter of the first insulating portion 130 is smaller than the diameter of the opening 21 and larger than the diameter of the engagement hole 22.

  With reference to FIG. 7, a state where the first endoscope electric plug 100 is inserted into the electric plug insertion portion 20 will be described.

  When the first endoscope electric plug 100 is inserted into the electric plug insertion portion 20, a female terminal (not shown) and the male terminal 151 come into contact with each other. Then, the two guide pins 124 engage with a slit (not shown) provided on the inner periphery of the electric plug insertion portion 20 to fix the first endoscope electric plug 100 to the electric plug insertion portion 20. .

  As described above, since the diameter of the insulating portion is smaller than the diameter of the opening 21 and larger than the diameter of the engagement hole when viewed from the insertion direction of the first endoscope electric plug 100, the first In a state where one endoscope electric plug 100 is inserted into the electric plug insertion portion 20, the first plug case 120 is completely accommodated inside the electric plug insertion portion 20 and isolated from the outside. As a result, the discharge generated outside the first electric plug 100 for the endoscope and the electric plug insertion portion 20 does not flow to the first plug case 120, and the standard IEC 60601-1-2 4th edition regarding EMC. Maintains the insulation properties specified in 1.

  According to the present embodiment, the first electric plug 100 for an endoscope that has a low possibility of receiving external discharge is obtained.

  Further, if the thickness of the first insulating portion 130 and the case lid 111 with respect to the axial direction of the first plug case 120 is appropriately determined, the first electric plug 100 for endoscope is added to the existing electric plug insertion portion 20. Can be inserted and fixed. Thereby, insulation can be ensured while using the existing electric plug insertion part 20.

  Moreover, since the 1st insulation part 130 and the case cover 111 can be shape | molded as separate components, shaping | molding is easy.

  Next, a second endoscope electric plug 200 according to the second embodiment will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The second endoscope electric plug 200 is different from the first embodiment in the configuration of the second plug case 220 and the second insulating portion 230. Therefore, the second plug case 220 and the second insulating part 230 will be mainly described.

  The second endoscope electrical plug 200 mainly includes a second plug case 220 made of a conductive metal and a second insulating portion 230.

  The second plug case 220 will be described with reference to FIG. FIG. 9 is a view of the second plug case 220 as viewed from the back.

  The second plug case 220 is made of a conductive metal, and includes a plug cylinder 121, a cylindrical second outer insertion portion 222, a cut surface 223b, connection surfaces 223a and 223c, and two guide pins 124. Prepare mainly.

  The outer diameter of the second outer insertion portion 222 gradually decreases from the rear end portion connected to the rear end plate 125 to the other front end portion 224. On the other hand, the inner diameter of the second outer insertion portion 222 is constant. The second outer insertion portion 222 is arranged such that the inner peripheral surface of the rear end plate 125 and the inner peripheral surface of the second outer insertion portion 222 are aligned with each other, and the plug cylinder 121 and the second outer insertion portion 222 are Are connected to the plug cylinder 121 so that their axes coincide with each other.

  The cut surface 223b and the connection surfaces 223a and 223c are planes parallel to the axis of the second plug case 220 and have a shape obtained by cutting the side surface of the second outer insertion portion 222. In the insertion portion 222, the insertion portion 222 is provided in the middle step portion 225 having an outer diameter that is one step longer than the outer diameter of the distal end portion 224.

  The cut surface 223b is a rectangular plane. The connection surfaces 223a and 223c are curved surfaces. The long sides of the connecting surfaces 223a and 223c are equal to each other and shorter than the long sides of the cut surface 223b. The lengths of the end sides of the cut surface 223b and the connection surfaces 223a and 223c are equal to each other.

  Surfaces having the same shape as the cut surface 223b and the connection surfaces 223a and 223c are provided at positions that are symmetric with respect to the axis of the second plug case 220. That is, the second plug case 220 has a total of two cut surfaces.

  Next, the second insulating portion 230 will be described with reference to FIGS. FIG. 10 is a view of the second insulating portion 230 as seen from above the front, and FIG. 11 is a view of the first insulating portion 130 as seen from above the back.

  The second insulating portion 230 is made of an electrically insulating resin, and includes a cylindrical insulating cylinder 131, an insulating flange 132, an engagement surface 233b, connection surfaces 233a and 233c, and two circular holes 134. Prepare mainly.

  The insulating cylinder 131 includes a second insulating hole 236 inside. The insulating flange 132 protrudes in the radial direction from a part of the outer periphery of the insulating cylinder 131, that is, from the outer periphery near the front end surface 137.

  The inner peripheral surface of the second insulating hole 236 increases stepwise from the back side end surface 135 toward the front side end surface 137. That is, on the inner peripheral surface of the second insulating hole 236, the diameter of the portion close to the back end face 135 of the insulating cylinder 131 is shorter than the diameter of the portion close to the front end face 137.

  The diameter of the portion of the insulating cylinder 131 that is close to the back end surface 135 is slightly longer than the diameter of the outer periphery of the distal end portion 224 of the second outer insertion portion 222, and the diameter of the portion that is close to the front end surface 137 is The diameter of the outer periphery of the end connected to the rear end plate 125 is slightly longer.

  An engagement surface 233 b is provided on the inner peripheral surface of the second insulating hole 236 near the back end surface 135. The two engagement surfaces 233b are rectangular parallelepiped surfaces that are parallel to the axis of the second insulating hole 236, and project inward from the inner peripheral surface of the second insulating hole 236 in the radial direction. Formed at the tip of the member. The two engaging surfaces 233b have the same shape and are provided at positions that are symmetrical with respect to the axis of the second insulating hole 236. That is, the second insulating portion 230 has a total of two engaging surfaces. The distance between the two engagement surfaces 233b is slightly longer than the distance between the symmetric cut surfaces. More specifically, the distance between the engagement surface 233b and the engagement surface 233b is slightly longer than the distance between the cut surface 223b and the cut surface 223b. The second insulating hole 236 and the engagement surface 233b are connected by connection surfaces 233a and 233c.

  Next, a state where the second plug case 220, the second insulating portion 230, the case lid 111, and the outer case 110 are assembled will be described with reference to FIGS. 12 is a front view of the second plug case 220, the second insulating portion 230, and the case lid 111 as viewed from the outside in the axial direction of the second plug case 220. FIG. 13 shows the second internal view. FIG. 6 is an end view showing a mirror electric plug 200.

  The second outer insertion portion 222 is inserted into the second insulating hole 236 and the outer receiving hole 143 and protrudes from the back surface of the case lid 111. At this time, the cut surface 223b engages with the engagement surface 233b. A male screw is cut on the outer periphery of the rear end of the second outer insertion portion 222. The male screw portion is screwed with the nut 155. When the nut 155 is tightened until it contacts the back surface of the case lid 111, the second insulating portion 230 is sandwiched and fixed between the rear end plate 125 and the front surface of the case lid 111. Thereby, the 2nd plug case 220, the 2nd insulating part 230, and the case cover 111 are fixed with respect to an axial direction.

  The second plug case 220 does not rotate with respect to the second insulating part 230 because the cut surface 223b is fitted to the engagement surface 233b. Further, similarly to the first embodiment, the two engagement protrusions 145 are fitted into the two circular holes 134, respectively. Thereby, the second insulating part 230 does not rotate with respect to the case lid 111. The second plug case 220, the second insulating portion 230, and the case lid 111 are fixed in the radial direction by the cut surface 223b, the engagement surface 233b, the engagement protrusion 145, and the circular hole 134.

  According to this embodiment, the same effect as that of the first embodiment is obtained.

  Next, a third endoscope electric plug 300 according to the third embodiment will be described with reference to FIG. The same components as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted. FIG. 14 is an end view of the third endoscope electric plug 300 and the electric plug insertion portion 20 cut at the same place as FIG. The third endoscope electric plug 300 is different from the first and second embodiments in the configuration of the third plug case 320 and the third insulating portion 330. Therefore, the third plug case 320 and the third insulating part 330 will be mainly described.

  The third plug case 320 is made of a conductive metal and mainly includes a cylindrical plug cylinder 121 and a cylindrical third outer insertion portion 322.

  The front end of the plug cylinder 121 forms a circular opening, and the rear end is closed by a rear end plate 125 that is a donut-shaped plate. A cylinder flange 326 is provided at the rear end of the plug cylinder 121. The cylinder flange 326 is provided over the entire outer periphery of the plug cylinder 121. The cylinder flange 326 has an O-ring groove 327 having a depth in the radial direction over the entire circumference. An O-ring 328 is attached to the O-ring groove 327. The length of the cylinder flange 326 protruding from the plug cylinder 121 is substantially the same as the diameter of the O-ring 328.

  The third outer insertion portion 322 has the same outer diameter from the rear end connected to the rear end plate 125 to the other front end. Further, the inner diameter of the third outer insertion portion 322 is constant. The third outer insertion portion 322 has a plug cylinder 121 and a third outer insertion portion 322 so that the inner peripheral surface of the rear end plate 125 and the inner peripheral surface of the third outer insertion portion 322 coincide with each other. Are connected to the plug cylinder 121 so that their axes coincide with each other.

  Two key grooves 123 are provided in the plug cylinder 121. Since the configuration of the keyway 123 is the same as that of the first embodiment, description thereof is omitted.

  Next, the third insulating portion 330 will be described. The third insulating portion 330 has a shape close to that obtained by integrating the first insulating portion 130 and the case lid 111.

  The third insulating portion 330 is made of a resin having electrical insulation, and mainly includes a cylindrical third insulating cylinder 331, an insulating ring 332, and a lid portion 141.

  The third insulating cylinder 331 includes a third insulating hole 336 therein. The insulating ring 332 protrudes from the outer periphery of the third insulating cylinder 331 in the axial direction of the third insulating cylinder 331. A void 329 is provided along the direction in which the insulating ring 332 projects and over the entire circumference of the third insulating portion 330.

  The inner peripheral surface of the third insulating hole 336 is constant over the entire length of the third insulating cylinder 331. Two keys 133 are provided on the inner peripheral surface of the third insulating hole 336. Since the configuration of the key 133 is the same as that of the first embodiment, description thereof is omitted.

  The lid portion 141 has a substantially rectangular parallelepiped plate shape, and has an outer peripheral shape in which corners are curved surfaces.

  Next, the third plug case 320 and the third insulating portion 330 attached to the outer case 110 will be described.

  The third outer insertion portion 322 is inserted into the third insulating hole 336 and protrudes from the back surface of the case lid 111 together with the third insulating portion 330. A male screw is cut on the outer periphery of the tip of the third outer insertion portion 322. The male screw portion is screwed with the nut 155. An insulating ring 157 made of an elastic member is attached to the entire outer periphery of the third insulating hole 336. When the nut 155 is tightened, the insulating ring 157 is first contacted. When the nut 155 is further tightened, the nut 155 brings the insulating ring 157 into contact with the metal frame 153 while moving the insulating ring 157 in the axial direction. When the nut 155 is further tightened, the insulating ring 157 is elastically deformed, and the third insulating portion 330 is sandwiched and fixed between the rear end plate 125 and the nut 155. Thereby, the 3rd plug case 320, the 3rd insulation part 330, and the case cover 111 are fixed with respect to an axial direction.

  When the third outer insertion portion 322 is completely inserted into the third insulating hole 336, the outer periphery of the cylinder flange 326 and the inner periphery of the insulating ring 332 are in contact with each other. The length of the insulating ring 332 with respect to the axial direction of the third outer insertion portion 322 is sufficient to contact the entire cylinder flange 326 with respect to the axial direction. An O-ring 328 is in contact with the outer periphery of the cylinder flange 326 and the inner periphery of the insulating ring 332 to maintain the airtightness inside the electric plug for endoscope. Further, when the third outer insertion portion 322 is completely inserted into the third insulating hole 336, the void 329 is slightly deformed so that the cylinder flange 326 and the insulating ring 332 are brought into close contact with each other.

  According to this embodiment, the same effect as that of the first embodiment is obtained. Further, as compared with other embodiments, the case lid 111 can be omitted and the number of O-rings used can be reduced.

  Next, a fourth endoscope electric plug 400 according to the fourth embodiment will be described with reference to FIG. The same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted. FIG. 15 is an end view of the fourth endoscope electric plug 400 and the electric plug insertion portion 20 cut at the same place as FIG. The fourth endoscope electric plug 400 is different from the first to third embodiments in the configuration of the fourth plug case 420 and the fourth insulating portion 430. Therefore, the fourth plug case 420 and the fourth insulating portion 430 will be mainly described.

  The fourth plug case 420 is made of a conductive metal and mainly includes a cylindrical plug cylinder 121 and a cylindrical fourth outer insertion portion 422.

  The front end of the plug cylinder 121 forms a circular opening, and the rear end is closed by a rear end plate 125 that is a donut-shaped plate. A fourth cylinder flange 426 is provided at the rear end of the plug cylinder 121 so as to protrude in the radial direction. The fourth cylinder flange 426 is provided over the entire outer periphery of the plug cylinder 121.

  The fourth outer insertion portion 422 has the same outer diameter and inner diameter from the rear end connected to the rear end plate 125 to the other front end, and the inner peripheral surface of the rear end plate 125 and the fourth outer insertion The plug cylinder 121 is connected so that the inner peripheral surface of the portion 422 coincides and the axis of the plug cylinder 121 and the fourth outer insertion portion 422 coincide.

  Two circular holes 134 (not shown) are provided in the plug cylinder 121. Since the configuration of the circular hole 134 is the same as that of the first embodiment, description thereof is omitted.

  Next, the fourth insulating portion 430 will be described. The fourth insulating portion 430 is made of a resin having electrical insulation, and is applied so as to completely cover the fourth cylinder flange 426 and the engagement guide 144. The fourth insulating portion 430 is applied on the order of micrometers.

  Next, the fourth plug case 420 and the fourth insulating portion 430 attached to the outer case 110 will be described.

  The fourth outer insertion portion 422 is inserted into the outer receiving hole 143 and protrudes from the back surface of the case lid 111. A male screw is cut on the outer periphery of the tip of the fourth outer insertion portion 422. The male screw portion is screwed with the nut 155. When the nut 155 is tightened until it contacts the back surface of the case lid 111, the fourth plug case 420 is fixed to the case lid 111. As a result, the fourth plug case 420 and the case lid 111 are fixed in the axial direction.

  O-rings 156 are provided between the fourth outer insertion portion 422 and the case lid 111, and between the case lid 111 and the outer case 110, respectively, and the inside of the fourth endoscope electric plug 400 is airtight. Retain sex.

  According to this embodiment, the same effect as that of the first embodiment is obtained. Moreover, insulation performance can be ensured only by application.

  The keyway 123 or the cut surface 223b may be used not only in the embodiment described above but also in other embodiments.

DESCRIPTION OF SYMBOLS 10 Endoscope apparatus 11 Electronic endoscope 12 Video processor 13 Insertion part 14 Grip part 15 Connection cable 16 Connector 17 Light guide plug 18 Light guide insertion part 20 Electric plug insertion part 100 1st endoscope electric plug 110 Outer Case 111 Case lid 120 First plug case 121 Plug cylinder 122 First outer insertion portion 123 Key groove 124 Guide pin 125 Rear end plate 130 First insulating portion 131 Insulating cylinder 132 Insulating flange 133 Key 134 Circular hole 135 Back side End surface 136 First insulating hole 137 Front side end surface 141 Lid portion 142 Engagement portion 143 Outer receiving hole 144 Engagement guide 145 Engagement protrusion 146 Front side 147 End surface 151 Male terminal 152 Harness 153 Metal frame 154 Substrate 155 Nut 156 O-ring 157 Insulation ring

Claims (9)

An electronic endoscope comprising a connector provided with an electric plug for an endoscope inserted into the electric plug insertion portion from the tip,
The electric plug for the endoscope is
A plug case made of conductive metal;
An insulating portion, and an insulating portion that covers the entire outer periphery near the rear end of the plug case.
When viewed from the insertion direction of the electrical plug for the endoscope, the insulating portion may have a larger outer circumference than the outer circumference of the plug casing, and smaller than the outer case of said connector
Electronic endoscope . The electric plug insertion part is a hole having a cylindrical shape,
The plug case has a cylindrical shape and is inserted on the inner peripheral side of the electric plug insertion portion,
The electrical plug insertion portion includes an opening and an engagement hole located deeper than the opening,
The diameter of the opening is larger than the diameter of the engagement hole,
The electronic endoscope according to claim 1, wherein when viewed from an insertion direction of the electric plug for endoscope, the diameter of the insulating portion is smaller than the diameter of the opening and larger than the diameter of the engagement hole. Mirror . The insulating portion includes an insulating hole into which a rear end of the plug case is inserted, and an insulating flange extending radially outward from the periphery of the insulating hole, and an outer periphery of the insulating flange is an outer periphery of the plug case The electronic endoscope according to claim 1 or 2. A case lid to which a rear end of the plug case is attached;
The electronic endoscope according to any one of claims 1 to 3, wherein the insulating portion is sandwiched between the plug case and the case lid. The plug case has a cylindrical shape and has a flange projecting in the radial direction from the vicinity of the rear end of the plug case,
The electronic endoscope according to claim 1, wherein the insulating portion is made of an insulator that covers the flange from a rear end of the plug case. The insulating part further includes an insulating hole into which a rear end of the plug case is inserted,
The plug case includes an outer insertion portion that is inserted into the insulating hole, and a cut surface that is a flat surface provided on a side surface of the outer insertion portion,
The electronic endoscope according to claim 1, wherein the insulating hole includes an engagement surface that is provided on an inner peripheral surface and engages with the cut surface. The plug case is provided with a concave portion at the rear end thereof that is recessed with respect to the insertion direction of the plug case,
The insulating portion includes an insulating hole into which a rear end of the plug case is inserted, and a convex portion protruding in an axial direction of the insulating hole from an inner peripheral surface of the insulating hole,
The electronic endoscope according to claim 1, wherein when the plug case and the insulating portion are combined, the convex portion engages with the concave portion. An electric plug for an endoscope which is inserted from an end into an electric plug insertion portion provided in a video processor, which is made of a conductive metal plug case and an insulator, and has an outer peripheral portion near the rear end of the plug case. An insulating portion that covers the entire circumference, and the insulating portion is provided between the plug case and an outer case of a connector that includes the electric plug for the endoscope. The electronic endoscope includes an electric plug for endoscope having an outer periphery larger than an outer periphery of the plug case when viewed from the insertion direction of the electric plug. A video processor with an electrical plug plug;
An electronic endoscope including a connector provided with an electric plug for an endoscope inserted into the electric plug insertion portion from the tip;
The endoscope electrical plug includes a plug case made of a conductive metal, and an insulating portion made of an insulator and covering an outer peripheral portion near the rear end of the plug case over the entire circumference. when viewed from the insertion direction of the lens for an electric plug, the insulating portion may have a larger outer circumference than the outer circumference of the plug casing, and a small endoscope apparatus than the outer casing of the connector.

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