JP6097577B2 - Harness assembly - Google Patents

Description

  The present invention relates to a harness assembly for an endoscope.

  An endoscope having a contrast tube for injecting a contrast medium into a bile duct or pancreatic duct having a very small inner diameter (about several mm) is known (see, for example, Patent Document 1).

JP 2007-117394 A

  When the endoscope body is to be directly inserted into the bile duct or pancreatic duct for diagnosis, the diameter of the distal end of the endoscope must be reduced to about several millimeters, and accordingly the endoscope It is also necessary to reduce the diameter of the tip of the harness installed in the interior.

  However, in order to reduce the diameter of the harness, the cable constituting the harness must also be thinned. As the harness diameter decreases, the electrical resistance of the entire harness increases, and the signal transmitted by the harness increases. There is a problem that the strength is greatly attenuated.

  The problem to be solved by the present invention is to provide a harness assembly that can suppress the attenuation of signal strength while reducing the diameter of the tip of the harness.

[1] A harness assembly according to the present invention is an endoscope harness assembly that transmits a signal from a camera or a sensor at a distal end portion of an endoscope, and includes a first cable having at least one first cable. Electrically connecting a harness, a second harness provided at a distal end side of the harness assembly with respect to the first harness and having at least one second cable, the first cable, and the second cable A connecting member connected to the first harness, wherein a diameter of the second harness is smaller than a diameter of the first harness, and the connecting member is located at an insertion portion inserted into a body cavity of the harness assembly. It is characterized by that.

  [2] In the above invention, the connection member includes a substrate and a first wiring pattern provided on the substrate, and the first cable is connected to one end of the first wiring pattern. The second cable may be connected to the other end of the first wiring pattern.

  [3] In the above invention, the connecting member may be bendable.

  [4] In the above invention, the first harness includes a plurality of first cables, the second harness includes a plurality of second cables, and the connection member is provided on both sides of the substrate. A plurality of the first wiring patterns may be provided.

  [5] In the above invention, the connection member includes a first substrate having a first wiring pattern to which the first cable is connected, and a second wiring pattern to which the second cable is connected. A second substrate, and the first wiring pattern and the second wiring pattern are electrically connected by bonding the first substrate and the second substrate together. Also good.

  [6] In the above invention, the connection member is provided on a substrate, one surface of the substrate, the first wiring pattern to which the first cable is connected, and one surface of the substrate, A second wiring pattern to which a second cable is connected, and the first wiring pattern and the second wiring pattern may be electrically connected by bending the substrate.

  [7] In the above invention, the first harness includes a first shield layer that covers a plurality of the first cables, and a first insulating layer that covers an outer surface of the first shield layer. The second harness may include a second insulating layer that directly covers the plurality of second cables.

  [8] In the above invention, a first shield layer that covers a plurality of the first cables and a first insulating layer that covers an outer surface of the first shield layer, and the second harness includes: The harness assembly may be exposed to the outside.

  In the endoscope harness assembly according to the present invention, the diameter of the second harness provided on the distal end side relative to the first harness is smaller than the diameter of the first harness. The diameter can be reduced.

  Further, in the harness assembly installed in the endoscope, only the distal end portion that is particularly required to be reduced in diameter can be configured by the second harness, and the proximal end portion can be configured by using the first harness. it can. For this reason, an increase in the electrical resistance of the entire harness assembly can be minimized, and attenuation of signals transmitted by the harness assembly can be suppressed.

FIG. 1 is a schematic cross-sectional view showing a configuration of an endoscope according to the first embodiment of the present invention. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 3 (A) and 3 (B) are cross-sectional views showing a modification of the second harness constituting the harness assembly of the present invention, and FIG. 3 (A) is a first modification. (B) is a 2nd modification. FIG. 4 is a plan view showing a connection portion of the harness assembly in the first embodiment of the present invention. FIG. 5 is a plan view showing a connection portion of the harness assembly in the second embodiment of the present invention. FIG. 6 is a plan view showing a connection portion of the harness assembly in the third embodiment of the present invention. FIG. 7 is a plan view showing a connection part of the harness assembly in the fourth embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<< first embodiment >>
FIG. 1 is a schematic cross-sectional view showing a configuration of an endoscope 10 in the present embodiment, and FIGS. 2A and 2B are cross-sectional views showing a harness constituting the harness assembly 1 in the present embodiment. 3 (A) and 3 (B) are cross-sectional views showing modified examples of the harness in the present embodiment, and FIG. 4 is a plan view showing the connection portion 4 of the harness assembly 1 in the present embodiment.

  The harness assembly 1 in this embodiment is provided with the 1st harness 2, the 2nd harness 3, and the connection part 4 which connects these, as shown in FIG. The harness assembly 1 is incorporated in the insertion portion 12 of the endoscope 10. The insertion portion 12 is a portion that is inserted into a body cavity in the endoscope 10 and has a cylindrical tube 13 made of a resin material. In place of the tubular tube 13, a braided sleeve, a spiral tube, or a multi-lumen tube in which strands are braided may be used.

  As shown in FIGS. 2A and 2B, the first harness 2 and the second harness 3 have substantially the same configuration except that their diameters are different.

  As shown in FIG. 2A, the first harness 2 includes four first cables 21, a shield layer 22 provided so as to surround the four first cables 21, and the first harness 21. 1 insulating layer 23. Similarly, as shown in FIG. 2B, the second harness 3 also includes four second cables 31 and a shield layer 32 provided so as to surround the four second cables 31. And a second insulating layer 33. The 2nd harness 3 is provided in the front end side rather than the 1st harness 2, as shown in FIG. These first and second harnesses 2 and 3 are inserted into a tubular tube 13, and a camera 11 is attached to the tip of the second harness 3.

  The first cable 21 includes an inner conductor 25, an insulating member 26 formed on the outer periphery of the inner conductor 25, an outer conductor 27 surrounding the outer periphery of the insulating member 26, and a cable jacket 28 formed on the outer periphery of the outer conductor 27. And. Similarly, the second cable 31 is formed on the inner conductor 35, the insulating member 36 formed on the outer periphery of the inner conductor 35, the outer conductor 37 surrounding the outer periphery of the insulating member 36, and the outer periphery of the outer conductor 37. A cable jacket 38.

  The inner conductors 25 and 35 are made of copper, silver, nickel, or an alloy thereof. As shown in FIG. 2, the internal conductor 25 is composed of a stranded wire in which seven fine wires 251 are twisted, and the internal conductor 35 is composed of a stranded wire in which three fine wires 351 are twisted. The numbers of the thin wires 251 and 351 constituting the inner conductors 25 and 35 are not particularly limited. Note that the inner conductors 25 and 35 may be formed of a single wire.

  The insulating members 26 and 36 are made of an insulating resin having a predetermined thickness. Examples of such an insulating resin include polyester resins, polyolefin resins, nylon, and fluorine resins.

  The outer conductor 27 of the first cable 21 is a part that functions as a shield layer, and a wire 271 made of copper, silver, nickel, or an alloy thereof is spirally wound around the outer periphery of the insulating member 26, It is formed by arranging a braided material obtained by knitting a wire on the outer periphery of the insulating member 26. In addition, the number of the wire 271 which comprises the external conductor 27 is not specifically limited.

  Similarly, the outer conductor 37 of the second cable 31 is also a part that functions as a shield layer, and a wire 371 made of copper, silver, nickel, or an alloy thereof is spirally wound around the outer periphery of the insulating member 36. Or a braided material obtained by knitting the wire is disposed on the outer periphery of the insulating member 36. In addition, the number of the wire 371 which comprises the external conductor 37 is not specifically limited.

  The cable jackets 28 and 38 are formed by extruding a thermoplastic resin. Examples of such a thermoplastic resin include polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and tetra-ethylene. Examples thereof include fluororesins such as fluoroethylene-ethylene copolymers.

  In the connection part 4 in this embodiment, as shown in FIG. 4, the cable jackets 28 and 38 are peeled off, and the external conductors 27 and 37 are exposed, respectively. Further, the outer conductors 27 and 37 are peeled off to expose the insulating members 26 and 36, respectively. Further, the insulating members 26 and 36 are peeled off to expose the internal conductors 25 and 35, respectively.

  As shown in FIG. 2A, the first harness 2 in the present embodiment has four first cables 21 described above, and around the four first cables 21. A shield layer 22 is provided so as to surround it. Similarly, the second harness 3 in the present embodiment also has four second cables 31 as shown in FIG. 2B, and surrounds the four second cables 31. Thus, the shield layer 32 is provided.

  Note that the number of the first cables 21 included in the first harness 2 is not particularly limited, and the first harness 2 may be configured with only one cable 21, or the first cable 2 may include the first cable 21. The harness 2 may be configured. In addition, the number of the second cables 31 included in the second harness 3 is not particularly limited, and the second harness 3 may be configured with only one cable 31, or the second cable 3 may include the second cable 31. The harness 3 may be configured.

  The shield layer 22 is formed by winding a wire 221 made of copper, silver, nickel, or an alloy thereof spirally around the four first cables 21, or four braiding materials knitting the wire. It is formed by arranging on the outer periphery of the first cable 21. Similarly, the shield layer 32 is formed by winding a wire 321 made of copper, silver, nickel, or an alloy thereof around the four second cables 31 in a spiral manner, or a braided material obtained by knitting the wire. It is formed by arranging on the outer periphery of the four second cables 31. In addition, the number of the wire materials 221 and 321 which comprise the shield layer 22 and the shield layer 32 is not specifically limited.

  As shown in FIGS. 2A and 2B, first insulating layers 23 and 33 are provided around the shield layers 22 and 32, respectively.

  The first and second insulating layers 23 and 33 protect the shield layers 22 and 32 from physical or chemical damage, respectively. The first and second insulating layers 23 and 33 are used as materials constituting the first and second insulating layers 23 and 33. Can be exemplified by resins such as fluororesin, polyethylene, and polyvinyl chloride.

In the present embodiment, as shown in FIG. 2 (A) and FIG. 2 (B), the diameter D _a of the second cable 31 of the second harness 3, the first constituting the first harness 2 smaller than the diameter _{D a} of the cable _{21 (D a <D a)} , Accordingly, the diameter _{D b} of the second harness 3 is smaller than the diameter _{D B} of the first harness 2 _{(D b} <D _B ).

The configuration of the second harness 3 is not particularly limited. For example, like the second harness 3B shown in FIG. 3A, the harness 3B does not have the shield layer 32 and the second cable 31 is directly covered with the second insulating layer 33. Good. In this case, the diameter _{D c} of the second harness 3B can be made smaller than the diameter _{D b} of the second harness _{3 (D c <D b)} .

Moreover, the 2nd cable 31 may be exposed outside the harness assembly like the 2nd harness 3C shown to FIG. 3 (B). In this case, it is possible to further reduce the diameter _{D d} of the second harness _{3C (D d <D c <} D b).

  The first cable 21 constituting the first harness 2 described above and the second cable 31 constituting the second harness 3 are electrically connected at the connection portion 4 of the harness assembly 1, respectively. Yes.

  As shown in FIG. 4, the connection unit 4 includes a substrate 41 and a set of wiring patterns (a first wiring pattern 42 and a second wiring pattern 43) provided on the substrate 41.

  In the following description, of the two first cables 21 shown on the right side in FIG. 4, the upper one in the figure is the first cable 21 </ b> A, and the lower one in the figure is the first one. Also referred to as cable 21B. Of the two second cables 31 shown on the left side in FIG. 4, the one located in the upper part in the figure is also called the second cable 31A, and the one located in the lower part in the figure is also called the second cable 31B.

  The substrate 41 is made of a rectangular insulating material having flexibility. Examples of such a material include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide resin (PI), and polyetherimide resin ( PEI) and the like can be exemplified.

  As shown in FIG. 4, a first wiring pattern 42 is formed on the upper side of the substrate 41. The first wiring pattern 42 includes a first signal pattern 421 and a first signal pattern 421 formed independently of each other. 1 outer conductor pattern 422. The first wiring pattern 42 is formed by printing and curing a conductive paste such as a silver paste, a gold paste, or a copper paste on the substrate 41.

  Examples of specific printing methods for forming the first wiring pattern 42 include screen printing, gravure offset printing, and ink jet printing. Note that the second wiring pattern 43 described later is also formed by the same material and the same printing method.

  The first signal pattern 421 has a rectangular signal land portion 62R provided on the right side in FIG. 4 of the substrate 41 and a rectangular signal land portion 62L provided on the left side in FIG. These are connected via the wiring part 63.

  The first outer conductor pattern 422 has an outer conductor land portion 72R provided on the right side of the substrate 41 in FIG. 4 and an outer conductor land portion 72L provided on the left side of the substrate 41 in FIG. These are connected via the wiring part 73.

  Then, on the upper side in FIG. 4 of the substrate 41, the internal conductor 25 of the first cable 21A is connected to the signal land portion 62R with solder or the like (not shown), and the signal land portion 62L includes The inner conductor 35 of the second cable 31A is connected by solder or the like (not shown). In addition, the external conductor 27 of the first cable 21A is connected to the external conductor land portion 72R by solder or the like (not shown), and the external conductor land portion 72L of the second conductor 31A is connected to the external conductor 37. Are connected by solder or the like (not shown).

  A first wiring pattern 43 having the same configuration as the first wiring pattern 42 is provided on the lower side of the substrate 41 in the drawing. The inner conductor 25 of the first cable 21B is connected to the inner conductor 35 of the second cable 31B via the first signal pattern 421, and the outer conductor 27 of the first cable 21B is the first cable 21B. The external conductor pattern 422 is connected to the external conductor 37 of the second cable 31B.

  In the present embodiment, the first wiring pattern 42 and the second wiring pattern 43 correspond to an example of the first wiring pattern of the present invention, and the signal land portion 62R and the outer conductor land portion 72R are the first wiring pattern in the present invention. The signal land portion 62L and the outer conductor land portion 72L correspond to an example of the other end of the first wiring pattern in the present invention.

  In the present embodiment, the first harness 2 has the four first cables 21 and the second harness 3 by preparing two sets of the connection portions 4 having the above configuration and superimposing them. Four second cables 31 are electrically connected to each other. The first and second wiring patterns are provided on both surfaces of a single substrate, and the first and second cables are connected to the wiring patterns, respectively. One cable and a second cable may be connected.

  The camera 11 attached to the distal end of the second harness 3 has an imaging element such as a CCD element or a CMOS element, for example, and is arranged at the distal end of the tube 13 so as to be able to image an observation target site in the body cavity. ing. Although not particularly illustrated, the endoscope 10 is further combined with a light guide connected to a light source, and the observation target part is imaged by the camera 11 while being illuminated by the light guide.

  Note that an ultrasonic sensor may be connected instead of the camera 11. Further, in order to clean the objective lens of the camera 11 and the illumination lens of the light guide, an air supply path or a water supply path for supplying water or air may be further combined. Further, a forceps guide path or a suction path for inserting a treatment tool used for tissue collection or foreign substance recovery may be combined.

  Incidentally, although not particularly illustrated, an operation unit is provided on the proximal end side of the first cable 31, and the operator operates the angle knob of the operation unit to control the bending inserted into the insertion unit 12. The tip of the insertion portion 12 can be bent to a desired angle via a cable (not shown). Further, the base end side of the first cable 31 is connected to a video system having a video processor and a monitor via a connector or the like. The image signal picked up by the camera 11 is sent to the video processor via the first and second harnesses 2 and 3 and the connecting portion 4 connecting them, and subjected to signal processing, and then the observation target region. Is displayed on the monitor.

  Next, the operation of this embodiment will be described.

  Since the bile duct and pancreatic duct have a length of about several tens of centimeters and a very small inner diameter (about several mm), in order to observe the inside of the bile duct or pancreatic duct in endoscopy The distal end portion of the endoscope must be thinned to about several mm. Accordingly, it is necessary to make the internal wiring of the endoscope thin. However, if all the internal wiring of the endoscope is thinned, the electrical resistance of the internal wiring increases, so that the image signal from the camera 11 attached to the distal end of the endoscope is attenuated and a clear image is obtained. I can't.

On the other hand, in the endoscope harness assembly 1 in the present embodiment, the first and second cables 21 and 31 having different diameters are electrically connected at the connection portion 4. Accordingly, the diameter D _a of the second cable 31 that is provided on the distal end side of the harness assembly 1 can be smaller than the diameter D _A of the first cable 21 which is provided on the base end side of the harness assembly 1 ( D _a <D _A ). Therefore, the diameter _{D b} of the second harness 3 comprising a second cable 31, can be made smaller than the first harness 2 diameter _{D B} which comprises a first cable 21 _(D b _{<D B} ), The diameter of the distal end of the harness assembly 1 and the endoscope 10 including the harness assembly 1 can be reduced.

For example, when observing the bile duct, a relatively wide space (inner diameter of about several tens of mm) is secured to insert the endoscope up to the duodenum which is the entrance of the bile duct. For this reason, only the distal end portion of the endoscope 10 that is particularly required to be reduced in diameter is configured by the second harness 3, and the proximal end side of the endoscope 10 has a diameter D _b of the second harness 3. it is possible to construct a harness assembly 1 by using the first harness having a larger diameter D _B than. As a result, an increase in electrical resistance of the harness assembly 1 accompanying a reduction in the diameter of the distal end portion of the endoscope 10 can be minimized, and attenuation of the image signal of the camera 11 transmitted by the harness assembly 1 is suppressed. can do.

<< Second Embodiment >>
FIG. 5 is a plan view showing the connection portion 4B of the harness assembly in the second embodiment of the present invention. The harness assembly according to the second embodiment is the same as the first embodiment described above except that the connecting portion 4B is different from the first embodiment. Therefore, only the parts different from the first embodiment will be described. About the part which is the same as a form, the code | symbol same as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 5, the harness assembly connecting portion 4 </ b> B in the present embodiment includes a rectangular substrate 41 </ b> B. The substrate 41B has a rectangular first area 411 and a second area 412 that are substantially equal to each other. Further, a bent portion 410 is provided at the boundary between the first and second areas 411 and 412, and the substrate 41 </ b> B can be bent by the bent portion 410.

  The first area 411 and the second area 412 are provided with first wiring patterns 42 and 43 having the same configuration as that of the connection part 4 described in the first embodiment, respectively. A total of four sets of the first cable 21 and the second cable 31 are connected by the wiring patterns 42 and 43. And the connection part 4B is comprised by bend | folding the board | substrate 41B with the bending part 410. FIG.

  Also in this example, the same effect as that of the first embodiment can be obtained.

<< Third Embodiment >>
FIG. 6 is a plan view showing a connection portion 4C of the harness assembly in the third embodiment of the present invention. The harness assembly according to the third embodiment is the same as the first embodiment described above except that the connecting portion 4C is different from the first embodiment. Therefore, only the parts different from the first embodiment will be described. About the part which is the same as a form, the code | symbol same as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 6, the harness assembly connecting portion 4 </ b> C in the present embodiment includes a first substrate 411 </ b> B and a second substrate 412 </ b> B having substantially equal rectangular shapes.

  A first wiring pattern 42B is provided on the upper side in FIG. 6 of the first substrate 411B. The first wiring pattern 42B includes a first signal pattern 421B and a first signal pattern 421B formed independently of each other. It is composed of an outer conductor pattern 422B.

  As shown in FIG. 6, the first signal pattern 421B has a rectangular signal land portion 44 provided on the right side in the drawing and a rectangular connection land portion 45 provided on the left side in the drawing. Their lower ends are connected via a wiring part 46.

  On the other hand, the first outer conductor pattern 422B has a rectangular outer conductor land portion 47 provided on the right side in FIG. 6 and a rectangular connection land portion 48 provided on the left side in the drawing. These upper ends are connected via a wiring part 49.

  As shown in FIG. 6, these four lands 44, 45, 47, 48 provided on the upper side of the first substrate 411B are formed so as to be lined up substantially in a line on the left and right in the drawing, and for signal use. The land portion 44 is provided to face the wiring portion 49, and the connection land portion 48 is provided to face the wiring portion 46.

  The signal land portion 44 of the first signal pattern 421B is connected to the inner conductor 25 of the first cable 21A, and the outer conductor land portion 47 of the first outer conductor pattern 422B is the first. Is connected to the outer conductor 27 of the cable 21A.

  A second wiring pattern 43B having the same configuration as the first wiring pattern 42B described above is formed on the lower side of the first substrate 411B in the present embodiment, as shown in FIG. It is connected to the first cable 21B. The first wiring pattern 42B and the second wiring pattern 43B in the present embodiment correspond to an example of the first wiring pattern of the present invention.

  Further, a third wiring pattern 52 is provided on the lower side of the second substrate 412B in FIG. 6, is connected to the second cable 31A, and is connected to the second substrate 412B on the upper side in FIG. Wiring pattern 53 is provided and connected to the second cable 31B. Note that the third wiring pattern 52 and the fourth wiring pattern 53 in the present embodiment correspond to an example of the second wiring pattern of the present invention.

  The connection land portions 45 and 48 of the first wiring pattern 42B face the connection land portions 55 and 58 of the third wiring pattern 52, respectively, and the connection land portions 45 and 48 of the second wiring pattern 43B. Are stacked with the first and second substrates 411B and 412B so as to face the connection land portions 55 and 58 of the fourth wiring pattern 53, respectively.

  Then, the first cables 21A and 21B are electrically connected to the second cables 31A and 31B, respectively, by bonding the opposing connection land portions with an anisotropic conductive film (ACF) or the like. In the present embodiment, a total of four sets of the first cable 21 and the second cable 31 are connected by producing two sets of the connection portions 4C having such a configuration and overlapping them.

  In addition, the number of the 1st and 2nd cables 21 and 31 connected by the connection part 4C is not specifically limited. For example, although not particularly illustrated, one set of wiring patterns having the same configuration as the wiring patterns 42B and 43B is provided on the first substrate 411B, and the same configuration as the wiring patterns 52 and 53 is also provided on the second substrate 412B. A further set of wiring patterns is provided and connected to the first and second cables 21 and 31, respectively. Next, a total of four sets of the first cable and the second cable may be connected by one connection portion by bonding the connection land portions with an anisotropic conductive film (ACF) or the like.

  Also in this example, the same effect as that of the first embodiment can be obtained.

<< Fourth embodiment >>
FIG. 7 is a plan view showing a connection portion 4D of the harness assembly in the fourth embodiment of the present invention. The harness assembly according to the fourth embodiment is the same as the first embodiment described above except that the connecting portion 4D is different from the first embodiment. Therefore, only the parts different from the first embodiment will be described. About the part which is the same as a form, the code | symbol same as 1st Embodiment is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 7, the harness assembly connection portion 4 </ b> D according to the present embodiment includes a substrate 41 </ b> C having a shape in which approximately equal-sized rectangles are joined while being shifted to the left and right in the drawing. In the following description, the lower rectangle in FIG. 7 on the substrate 41C is referred to as a first area 411C, and the upper rectangle in FIG. 7 on the substrate 41C is referred to as a second area 412C.

  The first area 411C is provided with the first and second wiring patterns 42B and 43B having the same configuration as that of the connection portion 4C described in the third embodiment, and the second area 412C is also provided in the second area 412C. Third and fourth wiring patterns 52 and 53 having the same configuration as the connection portion 4C of the third embodiment are provided.

  The first and second wiring patterns 42B and 43B are connected to the first cables 21A and 21B, respectively, and the third and fourth wiring patterns 52 and 53 are connected to the second cables 31A and 31B, respectively. It is connected.

  Further, as shown in FIG. 7, the substrate 41C in the present embodiment is provided with a bent portion 410B that can bend the substrate 41C at the boundary portion between the first area 411C and the second area 412C. .

  In the present embodiment, the connection land portion 45 of the first wiring pattern 42B and the connection land portion 55 of the third wiring pattern 52 are provided at symmetrical positions with the bent portion 410B interposed therebetween. Further, the connection land portion 48 of the first wiring pattern 42B and the connection land portion 58 of the third wiring pattern 52 are also provided at symmetrical positions with the bent portion 410B interposed therebetween.

  Similarly, the connecting land portion included in the second wiring pattern 43B and the connecting land portion included in the fourth wiring pattern 53 are also provided so as to be symmetrical with respect to the bent portion 410B.

  For this reason, by bending the board 41C with the bent portion 410B, the connecting land portion 45 faces the connecting land portion 55, and the connecting land portion 48 faces the connecting land portion 58.

  In the present embodiment, the connecting land portion 45 and the connecting land portion 55 are electrically connected using an anisotropic conductive film (ACF) or the like. Accordingly, the inner conductor 25 of the first cable 21A and the inner conductor 35 of the second cable 31A are electrically connected via the first signal pattern 421B and the second signal pattern 521.

  Similarly, the connecting land portion 48 and the connecting land portion 58 are electrically connected using an anisotropic conductive film (ACF) or the like. Accordingly, the outer conductor 27 of the first cable 21A and the outer conductor 37 of the second cable 31A are electrically connected via the first outer conductor pattern 422B and the second outer conductor pattern 522. Yes.

  In the same manner, the inner conductor 25 of the first cable 21B and the inner conductor 35 of the second cable 31B are electrically connected, and the outer conductor 27 of the first cable 21B and the second cable are connected. The outer conductor 37 of 31B is also electrically connected. In the present embodiment, a total of four sets of the first cable 21 and the second cable 31 are connected by producing two sets of connection portions 4D having such a configuration and superposing them.

  Even in this case, the same effect as the first embodiment can be obtained.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Harness assembly 2 ... 1st harness 21 ... 1st cable 22 ... Shield layer 23 ... 1st insulating layer 3 ... 2nd harness 31 ... 1st Second cable 33... Second insulating layer 4, 4B, 4C, 4D... Connection portion 41, 41B, 41C .. Substrate 411B ... First substrate 412B ... Second substrate 42 , 42B ... first wiring pattern 421, 421B ... first signal pattern 422, 422B ... first outer conductor pattern 43, 43B ... second wiring pattern 52 ... Third wiring pattern 521 ... Second signal pattern 522 ... Second outer conductor pattern 53 ... Fourth wiring pattern 62R, 62L ... Signal land 72R, 72L, ...・ Land for external conductor

Claims (8)

A harness assembly for an endoscope that transmits a signal from a camera or a sensor at a distal end portion of the endoscope,
The harness assembly is
A first harness having at least one first cable;
A second harness provided at a distal end side of the harness assembly with respect to the first harness and having at least one second cable;
A connection member for electrically connecting the first cable and the second cable;
The diameter of the second harness is smaller than the diameter of the first harness,
The harness assembly according to claim 1, wherein the connection member is located at an insertion portion to be inserted into a body cavity of the harness assembly. The harness assembly according to claim 1, wherein
The connecting member is
A substrate,
A first wiring pattern provided on the substrate,
The first cable is connected to one end of the first wiring pattern;
The harness assembly, wherein the second cable is connected to the other end of the first wiring pattern. The harness assembly according to claim 2, wherein
A harness assembly, wherein the connecting member is bendable. The harness assembly according to claim 2, wherein
The first harness has a plurality of first cables,
The second harness has a plurality of second cables,
The harness assembly, wherein the connection member has a plurality of the first wiring patterns provided on both surfaces of the substrate. The harness assembly according to claim 1, wherein
The connecting member is
A first substrate having a first wiring pattern to which the first cable is connected;
A second substrate having a second wiring pattern to which the second cable is connected,
A harness assembly, wherein the first wiring pattern and the second wiring pattern are electrically connected by bonding the first substrate and the second substrate together. The harness assembly according to claim 1, wherein
The connecting member is
A substrate,
A first wiring pattern provided on one surface of the substrate and connected to the first cable;
A second wiring pattern provided on one surface of the substrate and connected to the second cable;
A harness assembly, wherein the first wiring pattern and the second wiring pattern are electrically connected by bending the substrate. The harness assembly according to any one of claims 1 to 6,
The first harness is
A first shield layer covering a plurality of the first cables;
A first insulating layer covering an outer surface of the first shield layer,
The second harness includes a second insulating layer that directly covers a plurality of the second cables. The harness assembly according to any one of claims 1 to 6,
The first harness is
A first shield layer covering a plurality of the first cables, and a first insulating layer covering an outer surface of the first shield layer,
The harness assembly, wherein the second harness is exposed to the outside of the harness assembly.

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