Cable connection structure, and method for manufacturing a cable connection structure

Abstract

To provide a cable connection structure that can be reduced in cost and has excellent flexibility, and a method for manufacturing the cable connection structure.SOLUTION: A cable connection structure 100 comprises: a cable 3 having a sheath 35 and first to fourth electric wires 31-34 in which core wires 311, 321, 331, 341 made of metal conductors are coated with insulators 312, 322, 332, 342, respectively; and an imaging device 2 having first to fourth electrodes 201-204. In the cable 3, the respective core wires 311, 321, 331, 341 and insulators 312, 322, 332, 342 of the first to fourth electric wires 31-34 and the sheath 35 are collectively cut perpendicularly to a longitudinal direction at an end 300 of the cable. Tip portions of the core wires 311, 321, 331, 341 including collectively cut cross-sections 311a, 321a, 331a, 341a of the first to fourth electric wires 31-34 are soldered to the first to fourth electrodes 201-204, respectively.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a cable connection structure in which a cable is connected to an electronic component, and a method for manufacturing the same.

Background Art

[0002] Conventionally, for example, an endoscope system used for inspection and treatment of luminal organs and blood vessels includes an imaging device such as a CCD (Charge Coupled Device) camera, an image processing device that performs image processing for displaying the captured image on a display, and a cable that connects the imaging device and the image processing device.

[0003] The imaging module described in Patent Document 1 includes an imaging element having a plurality of electrodes, a signal cable having a plurality of conductors, a circuit board having a plurality of connection wirings that connect the plurality of electrodes of the imaging element and the plurality of conductors of the signal cable, and a fixing member that fixes the signal cable to the circuit board.

[0004] The imaging unit described in Patent Document 2 includes an imaging element having a plurality of electrode pads, a coaxial cable having an inner conductor and an outer conductor, and a three-dimensional wiring board interposed between the imaging element and the coaxial cable. The three-dimensional wiring board has an inner conductor connection pad to which the inner conductor of the coaxial cable is connected, an outer conductor connection pad to which the outer conductor of the coaxial cable is connected, a plurality of element connection pads respectively connected to the plurality of electrode pads of the imaging element, and a plurality of pad-to-pad connection wirings that electrically connect these pads.

[0005] The cable connection structure described in Patent Document 3 includes an imaging device in which a plurality of electrodes are formed on an electrode formation surface of an imaging element, a cable in which a plurality of electric wires are led out from an outer skin over a predetermined length, and an embedding member formed by curing a resin filled around the plurality of electric wires led out from the outer skin. The plurality of electric wires are each soldered to the electrodes of the imaging element.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-47300 [Patent Document 2] Japanese Patent Publication No. 2019-195450 [Patent Document 3] Patent No. 6996648 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In the imaging module described in Patent Document 1, a circuit board and fixing members are interposed between the image sensor and the signal cable, and in the imaging unit described in Patent Document 2, a three-dimensional wiring board is interposed between the image sensor and the coaxial cable. As a result, these components increase the cost of both parts and wiring. Furthermore, while the device described in Patent Document 3 can reduce the cost of parts and wiring compared to those described in Patent Documents 1 and 2, the multiple wires become less flexible in the areas where the embedded members are provided, reducing the flexibility of the cable.

[0008] Therefore, the present invention aims to provide a cable connection structure that can be manufactured at a low cost and has excellent flexibility, and a method for manufacturing the cable connection structure. [Means for solving the problem]

[0009] The present invention aims to solve the above problems and provides a cable connection structure comprising a plurality of electric wires, each having a core wire made of a metal conductor covered with an insulator, and a sheath covering the plurality of electric wires, and an electronic component having a plurality of electrodes, wherein at its end, the core wire and insulator of each of the plurality of electric wires are cut together perpendicular to the longitudinal direction along with the sheath, and the ends of the core wires, including the cut cross-section of the core wire, of the plurality of electric wires are soldered to the plurality of electrodes.

[0010] Furthermore, the present invention aims to solve the above problems and provides a method for manufacturing a cable connection structure comprising a plurality of electric wires having a metal conductor core covered with an insulator and a cable having a sheath covering the plurality of electric wires, and an electronic component having a plurality of electrodes, the method comprising: a cutting step of cutting each of the plurality of electric wires, the core wire and the insulator together with the sheath perpendicular to the longitudinal direction of the cable; and a connecting step of aligning the cut cross section of the cable with the surface of the electronic component on which the plurality of electrodes are formed, and connecting the tip portions of the core wires, including the cross sections of the core wires of the plurality of electric wires, to the plurality of electrodes, respectively. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a cable connection structure that can be manufactured at a low cost and has excellent flexibility, as well as a method for manufacturing the cable connection structure. [Brief explanation of the drawing]

[0012] [Figure 1] (a) is a system configuration diagram of an endoscope system including an endoscope scope using an imaging device with a cable according to the first embodiment of the present invention. (b) is an end view showing the insertion end of the endoscope scope. (c) is a cross-sectional view of (a) along line AA. [Figure 2] (a) is a cross-sectional view showing the vicinity of the insertion end of the endoscope scope along line BB in Figure 1(b). (b) is a cross-sectional view showing the endoscope scope in a bent state. [Figure 3] (a) is a perspective view showing the imaging device. (b) is a plan view showing the electrode formation surface of the imaging device. [Figure 4] (a) is a perspective view showing the core wires of the first to fourth electric wires connected to the first to fourth electrodes of the imaging device. (b) is an explanatory diagram showing the positional relationship between the core wires and the first to fourth electrodes as viewed from the normal direction along the normal to the electrode formation surface. [Figure 5] (a) and (b) are explanatory diagrams showing the cutting process. [Figure 6] (a) and (b) are explanatory diagrams showing the connection process. [Figure 7] It is an explanatory diagram showing the filling process. [Figure 8] (a) and (b) are perspective views showing the cross-sections of the cable before and after the connection process. [Figure 9] (a) is a cross-sectional view of an endoscope scope having a cable according to a second embodiment. (b) is a configuration diagram showing a connection portion between an imaging device and a cable according to the second embodiment. [Figure 10] (a) is a cross-sectional view showing an endoscope scope having a cable according to a third embodiment. (b) is a perspective view showing the cross-section of the cable according to the third embodiment and its peripheral portion.

Mode for Carrying Out the Invention

[0013] [First Embodiment] FIG. 1(a) is a system configuration diagram of an endoscope system 1 including an endoscope scope 10 using an imaging device with a cable according to the first embodiment of the present invention. FIG. 1(b) is an end face view showing the insertion end portion 101 of the endoscope scope 10. FIG. 1(c) is a cross-sectional view taken along the line A-A of FIG. 1(a).

[0014] The endoscope system 1 includes an endoscope scope 10, an image processing device 11 that processes image information obtained by the endoscope scope 10, and a display 12 that displays an image processed by the image processing device 11 on a screen 121.

[0015] A part of the longitudinal direction of the endoscope scope 10 including the insertion end portion 101 is inserted into a blood vessel of a human body. A connector 102 that is detachable from the image processing device 11 is provided at an end portion of the endoscope scope 10 on the side opposite to the insertion end portion 101 in the longitudinal direction. The length of the endoscope scope 10 is, for example, 1 m or more and 4 m or less. <000009三> Fig. 2(a) is a cross-sectional view showing the vicinity of the insertion end 101 of the endoscope scope 10 along line B-B in Fig. 1(b). Fig. 2(b) is a cross-sectional view showing the state in which the endoscope scope 10 is bent.

[0017] The endoscope scope 10 includes an imaging device 2, a cable 3, a filler 4 filled between the imaging device 2 and the cable 3, a plurality of optical fibers 5, a tube 6 that houses these, and a cover body 7 that closes the tip opening of the tube 6. The imaging device 2 has an overall rectangular parallelepiped shape and is disposed in the tube 6 such that its longitudinal direction is parallel to the longitudinal direction of the tube 6. The tube 6 is made of a flexible resin and has an outer diameter of, for example, 2 mm or less. The imaging device 2, the cable 3, and the filler 4 constitute a cable connection structure 100. The imaging device 2 is an aspect of the electronic component of the present invention.

[0018] The cover body 7 is formed with a through-hole 71 for the imaging device into which the tip of the imaging device 2 fits, and a plurality of through-holes 72 for the optical fibers into which the tips of the plurality of optical fibers 5 respectively fit. In the present embodiment, the endoscope scope 10 has two optical fibers 5, and two through-holes 72 for the optical fibers are formed in the cover body 7. Illumination light is incident on the optical fiber 5 from the end on the side of the image processing device 11, and this illumination light is emitted from the end on the side of the cover body 7. The illumination light emitted from the optical fiber 5 illuminates the imaging target of the imaging device 2.

[0019] The imaging device 2 includes a rectangular tube-shaped case member 21, a light-transmissive imaging window 22 fixed to one end of the case member 21, an imaging element 23 fixed to the other end of the case member 21, and a plurality of lenses 24, 25 disposed between the imaging window 22 and the imaging element 23. Specifically, as the imaging element 23, for example, a CMOS image sensor or a CCD image sensor can be used. The imaging element 23 converts information on the optical image formed on its light-receiving surface into an electrical signal and transmits it to the image processing device 11 via the cable 3.

[0020] Cable 3 is a multi-core cable comprising first to fourth electric wires 31 to 34 and a sheath 35 that covers the first to fourth electric wires 31 to 34 together. The first to fourth electric wires 31 to 34 are insulated electric wires having core wires 311, 321, 331, 341 made of a highly conductive metal conductor such as a copper alloy, and insulators 312, 322, 332, 342 made of an electrically insulating resin. The longitudinal end 300 of cable 3 faces the imaging device 2.

[0021] For the core wires 311, 321, 331, and 341, for example, wires of size 33 to 39 AWG (diameter 0.0889 mm to 0.18034 mm) can be used. AWG is a standard for American Wire Gauge. In this embodiment, the core wires 311, 321, 331, and 341 are single wires, but stranded wires made by twisting multiple strands together may also be used for the core wires 311, 321, 331, and 341. For the insulators 312, 322, 332, and 342 covering the core wires 311, 321, 331, and 341, for example, those made of PVC (polyvinyl chloride) can be used.

[0022] The sheath 35 is made of an electrically insulating resin and is formed as a hollow tube with a circular cross-section. Suitable resin materials for the sheath 35 include, for example, fluororesins such as PFA (perfluoroalkoxyalkane). The sheath 35 is formed by extruding molten resin onto the outer circumference of a wire bundle 30 consisting of first to fourth wires 31 to 34.

[0023] The insulators 312, 322, 332, 342 and the sheath 35 have thermal shrinkage properties, meaning they shrink when heated during the connection process described later. This thermal shrinkage property is a common characteristic of resin molded products, and for example, the thermal shrinkage property of the sheath 35 can be adjusted by the extrusion temperature during extrusion molding, the wire speed of the wire bundle 30, and the draw ratio. More specifically, the higher the extrusion temperature, wire speed, and draw ratio, the greater the shrinkage rate.

[0024] The first wire 31 is, for example, a power line that supplies operating power to the imaging device 2. The second wire 32 is, for example, a signal line that transmits optical image information converted into an electrical signal by the image sensor 23 to the image processing device 11. The third wire 33 is a signal line that transmits control signals from the image processing device 11 to the imaging device 2, for example, a shutter signal. The fourth wire 34 is an electrically grounded drain wire.

[0025] Figure 3(a) is a perspective view showing the imaging device 2. Figure 3(b) is a plan view showing the electrode formation surface 20 of the imaging device 2. The longitudinal length L of the imaging device 2 is, for example, 1.0 mm or more and 2.0 mm or less. The end of the imaging device 2 on the cable 3 side in its longitudinal direction is the electrode formation surface 20. The electrode formation surface 20 is the opposing surface facing the end 300 of the cable 3.

[0026] First to fourth electrodes 201 to 204 are formed on the electrode-forming surface 20. The core wire 311 of the first electric wire 31 is connected to the first electrode 201, the core wire 321 of the second electric wire 32 is connected to the second electrode 202, the core wire 331 of the third electric wire 33 is connected to the third electrode 203, and the core wire 341 of the fourth electric wire 34 is connected to the fourth electrode 204.

[0027] In Figure 3(a), the normal 200 of the electrode forming surface 20 is shown by a dashed line. The electrode forming surface 20 is a flat surface with a rectangular shape when viewed along the normal 200, and the lengths of its sides Lh and Lv are less than or equal to the outer diameter D of the sheath 35 (see Figure 1(c)). The lengths of the sides Lh and Lv of the electrode forming surface 20 are, for example, 0.6 mm or more and 1.1 mm or less. In this embodiment, the electrode forming surface 20 is square and the lengths of its sides are equal, but it is not limited to this, and the electrode forming surface 20 may be rectangular, for example. The outer diameter D of the sheath 35 is, for example, 1.0 times or more and 1.5 times the lengths of the sides Lh and Lv of the electrode forming surface 20.

[0028] When viewing the electrode-forming surface 20 from the cable 3 side along the normal vector 200, the first to fourth electrodes 201 to 204 are arranged such that the line segments connecting their respective center points 201a, 202a, 203a, and 204a parallel to each side of the electrode-forming surface 20 form a quadrilateral. In the example shown in Figure 3(a), the first to fourth electrodes 201 to 204 are circular in shape, but the shape of the first to fourth electrodes 201 to 204 is not limited to this, and they may be rectangular, for example.

[0029] Figure 4(a) is a perspective view showing the core wires 311, 321, 331, 341 of the first to fourth electric wires 31 to 34 connected to the first to fourth electrodes 201 to 204 of the imaging device 2, with the insulators 312, 322, 332, 342 and sheath 35 of the cable 3 omitted from the illustration. Figure 4(b) is an explanatory diagram showing the positional relationship between the core wires 311, 321, 331, 341 and the first to fourth electrodes 201 to 204, as viewed from the normal direction along the normal 200 of the electrode forming surface 20.

[0030] In Figure 4(b), the outer edges of the cross-sections 311a, 321a, 331a, and 341a of the core wires 311, 321, 331, and 341 are shown by dashed lines. Cross-sections 311a, 321a, 331a, and 341a are the end faces of the core wires 311, 321, 331, and 341 on the side facing the imaging device 2, and are circular in shape.

[0031] The core wires 311, 321, 331, and 341 of the first to fourth electric wires 31 to 34 are mechanically and electrically connected to the first to fourth electrodes 201 to 204, respectively, by solder 8. The first to fourth electric wires 31 to 34 are not twisted together within the sheath 35, and as shown in Figure 2(a), when the longitudinal direction of the cable 3 coincides with the longitudinal direction of the imaging device 2, the first to fourth electric wires 31 to 34 do not spread apart from each other at the end on the imaging device 2 side, but extend parallel to the normal 200 of the electrode forming surface 20.

[0032] As shown in Figure 4(b), the cross-sections 311a, 321a, 331a, 341a of the core wires 311, 321, 331, 341 of the first to fourth electric wires 31 to 34 and the first to fourth electrodes 201 to 204 are aligned in the direction normal to the electrode forming surface 20 in at least a portion of the area. Ideally, the positions of the center points 311b, 321b, 331b, and 341b of the cross-sections 311a, 321a, 331a, and 341a of the core wires 311, 321, 331, and 341 viewed from the direction normal to the electrode forming surface 20 should coincide with the center points 201a, 202a, 203a, and 204a of the first to fourth electrodes 201 to 204, respectively. However, a positional deviation is permissible between the core wires 311, 321, 331, and 341 and the first to fourth electrodes 201 to 204, for example, as long as the positions of the center points 311b, 321b, 331b, and 341b are inside the outer edges of the first to fourth electrodes 201 to 204.

[0033] Next, a method for manufacturing the cable connection structure 100 will be described. The method for manufacturing the cable connection structure 100 includes a cutting step of cutting the core wires 311, 321, 331, 341 and insulators 312, 322, 332, 342 of the first to fourth electric wires 31 to 34 together with the sheath 35 perpendicular to the longitudinal direction of the cable 3; a connecting step of connecting the ends of the core wires 311, 321, 331, 341, including the cross-sections 311a, 321a, 331a, 341a of the core wires 311, 321, 331, 341 of the first to fourth electric wires 31 to 34 to the first to fourth electrodes 201 to 204, respectively; and a filling step of filling the space between the imaging device 2 and the cable 3 with a filler 4.

[0034] Figures 5(a) and (b) are explanatory diagrams showing the cutting process. In the cutting process, the first to fourth wires 31-34 and the sheath 35 are cut at one point along the longitudinal direction of the cable 3 using a cutting tool 9. After cutting the cable 3, the cut surface 3a may be polished or ground.

[0035] Figures 6(a) and (b) are explanatory diagrams showing the connection process. Solder 8 is pre-applied in a hemispherical shape to the first to fourth electrodes 201 to 204. In the connection process, as shown in Figure 6(a), the electrode forming surface 20 of the imaging device 2 and the cut surface 3a of the cable 3 are brought into contact with each other, and the cross-sections 311a, 321a, 331a, and 341a of the core wires 311, 321, 331, and 341a are brought into contact with the solder 8 applied to the first to fourth electrodes 201 to 204, respectively. Note that in this state, the solder 8 is in a solid form.

[0036] Subsequently, as shown in Figure 6(b), hot air H is blown onto the electrode forming surface 20 and the end 300 of the cable 3 to melt the solder 8 and perform soldering. The hot air H is an inert gas such as nitrogen gas, and its temperature is higher than the melting point of the solder 8, and is a temperature that does not melt the insulators 312, 322, 332, 342 and the sheath 35 during the connection process.

[0037] Figure 7 is an explanatory diagram showing the filling process. In the filling process, the core wires 311, 321, 331, and 341 are soldered to the first to fourth electrodes 201 to 204, and then adhesive is filled into the gap between the electrode forming surface 20 of the imaging device 2 and the cable 3. For this adhesive, an acrylic adhesive can be used, for example.

[0038] Figures 8(a) and 8(b) are perspective views showing the cross-section 3a of the cable 3 before and after the connection process. Figure 8(a) shows the state before the connection process, and Figure 8(b) shows the state after the connection process.

[0039] During the connection process, the insulators 312, 322, 332, 342 and the sheath 35 are heated by hot air H and shrink in the longitudinal direction of the cable 3. As a result, without having to remove the ends of the insulators 312, 322, 332, 342 and the sheath 35 using tools such as wire strippers, the ends of each core wire 311, 321, 331, 341 protrude in the longitudinal direction of the cable 3 toward the electrode forming surface 20, beyond the cross-sections 312a, 322a, 332a, 342a of the insulators 312, 322, 332, 342 and the cross-section 35a of the sheath 35. In other words, after the connection process, the cross-sections 312a, 322a, 332a, 342a of the insulators 312, 322, 332, 342a and the cross-section 35a of the sheath 35 are more constricted in the longitudinal direction of the cable 3 than the cross-sections 311a, 321a, 331a, 341a of the core wires 311, 321, 331, 341a.

[0040] As the insulators 312, 322, 332, 342 and the sheath 35 shrink in this way, the hot air H can more easily reach the solder 8, causing the solder 8 to melt quickly, and the connection process can be performed in a short time without thermal damage to the image sensor 23, etc. In addition, as the insulators 312, 322, 332, 342 shrink, the sides 311c, 321c, 331c, 341c of the core wires 311, 321, 331, 341 are exposed, and the solder 8 adheres not only to the cross-sections 311a, 321a, 331a, 341a but also to the sides 311c, 321c, 331c, 341c. This makes it possible to perform soldering with high joint strength.

[0041] In this embodiment, the shrinkage rate of the sheath 35 is greater than that of the insulators 312, 322, 332, and 342. As shown in Figures 6(b) and 7, the cross-section 35a of the sheath 35 is even larger than the cross-sections 312a, 322a, 332a, and 342a of the insulators 312, 322, 332, and 342a, and shrinks in the longitudinal direction of the cable 3. However, this is not limited to this, and for example, the shrinkage length of the sheath 35 may be the same as that of the insulators 312, 322, 332, and 342, or the shrinkage length of the sheath 35 may be shorter than that of the insulators 312, 322, 332, and 342. However, it is more desirable if the shrinkage length of the sheath 35 is longer than the shrinkage length of the insulators 312, 322, 332, and 342, as this allows the hot air H to hit the insulators 312, 322, 332, and 342 more easily, causing them to shrink, and also allows the hot air H to hit the solder 8 more easily. The shrinkage length is the length in the longitudinal direction of the cable 3 that has shrunk due to thermal shrinkage during the connection process.

[0042] (Operation and effects of the first embodiment) According to the first embodiment described above, no other components are interposed between the imaging device 2 and the cable 3, and the core wires 311, 321, 331, and 341 of the first to fourth electric wires 31 to 34 are directly connected to the first to fourth electrodes 201 to 204 of the imaging device 2, respectively, thus reducing component costs and wiring costs. Furthermore, as shown in Figure 2(b), the cable 3 can be bent from near the cut surface 3a, thereby increasing the flexibility of the endoscope scope 10 and the cable connection structure 100.

[0043] [Second Embodiment] Next, a second embodiment of the present invention will be described with reference to Figures 9(a) and (b). Figure 9(a) is a cross-sectional view of an endoscope scope 10 having a cable 3 according to the second embodiment. Figure 10(b) is a configuration diagram showing the connection between the imaging device 2 and the cable 3.

[0044] In this embodiment, the cable 3 has a central separator 360 and first to fourth side separators 361 to 364 in addition to the first to fourth electric wires 31 to 34. The central separator 360 is located in the center of the cable 3, surrounded by the first to fourth electric wires 31 to 34. The first side separator 361 is located between the first electric wire 31 and the second electric wire 32 and the sheath 35, the second side separator 362 is located between the first electric wire 31 and the third electric wire 33 and the sheath 35, the third side separator 363 is located between the second electric wire 32 and the fourth electric wire 34 and the sheath 35, and the fourth side separator 364 is located between the third electric wire 33 and the fourth electric wire 34 and the sheath 35.

[0045] The central intervening 360 and the first to fourth side intervenings 361 to 364 are cut together with the first to fourth electric wires 31 to 34 and the sheath 35 during the cutting process. The first to fourth side intervenings 361 to 364 are made of resin and have heat shrinkage properties, but their shrinkage rate when heated is smaller than that of the insulators 312, 322, 332, and 342 of the first to fourth electric wires 31 to 34. Therefore, as shown in Figure 9(b), the cross-sections 312a, 322a, 332a, and 342a of the insulators 312, 322, 332, and 342a that are cut during the cutting process are more contracted in the longitudinal direction of the cable 3 than the cross-section 360a of the central intervening 360 and the cross-sections 361a, 362a, 363a, and 364a of the first to fourth side intervenings 361 to 364.

[0046] According to this second embodiment, in addition to the effects of the first embodiment, the central intervening 360 and the first to fourth side intervenings 361 to 364 stabilize the positions of the first to fourth electric wires 31 to 34 within the sheath 35, making it easier to align the core wires 311, 321, 331, 341 with the first to fourth electrodes 201 to 204. Furthermore, since the central intervening 360 and the first to fourth side intervenings 361 to 364 protrude toward the electrode forming surface 20 of the imaging device 2 beyond the cross-sections 312a, 322a, 332a, 342a of the insulators 312, 322, 332, 342, the central intervening 360 and the first to fourth side intervenings 361 to 364 can suppress the occurrence of solder bridges that would cause short circuits between solders 8.

[0047] Furthermore, the central intervening 360 and any of the first to fourth side intervenings 361 to 364 may be omitted. For example, the first to fourth side intervenings 361 to 364 may be omitted, or the central intervening 360 may be omitted. Even in these cases, the positions of the first to fourth electric wires 31 to 34 are more stable compared to the first embodiment.

[0048] [Third Embodiment] Next, a third embodiment of the present invention will be described with reference to Figures 10(a) and (b). Figure 10(a) is a cross-sectional view showing an endoscope scope 10 having a cable 3 according to the third embodiment. Figure 10(b) is a perspective view showing the cut surface 3a of the cable 3 and its surrounding area.

[0049] In the first embodiment, the case was described in which the size (thickness) of the core wires 311, 321, 331, and 341 of the first to fourth electric wires 31 to 34 is the same. However, in this embodiment, among the first to fourth electric wires 31 to 34, the size of the core wire 341 of the electrically grounded fourth electric wire 34 is formed to be thicker than the size of the core wires 311, 321, and 331 of the other first to third electric wires 31 to 33. In addition, the first to fourth electric wires 31 to 34 are not twisted together as in the first embodiment, and extend parallel to the longitudinal direction of the cable 3.

[0050] Furthermore, in this embodiment, in order to facilitate the alignment of the first to fourth wires 31 to 34 with respect to the first to fourth electrodes 201 to 204 when connecting the cable 3 to the imaging device 2, an indicator 350 indicating the position of the fourth wire 34 is provided on a part of the circumferential direction of the outer surface 35b of the sheath 35 which is on the outer circumference side of the fourth wire 34.

[0051] Figure 10(b) shows that the indicator 350 is a straight line extending along the longitudinal direction of the cable 3, but it is not limited to this, and may be a dotted line or a double line, for example. Also, a string of characters indicating the manufacturer name or model name of the cable 3 may be used as an indicator to show the position of the fourth wire 34. Furthermore, the position of the indicator 350 on the outer surface 35b of the sheath 35 does not have to be on the outer side of the fourth wire 34, as long as the relative position with respect to the fourth wire 34 is predetermined.

[0052] When connecting cable 3 to imaging device 2, the cable 3 is aligned with imaging device 2 using indicator 350 as a guide during the connection process. The cross-sectional area of ​​the core wire 341 of the fourth electric wire 34 is, for example, 1.5 times or more the cross-sectional area of ​​the core wires 311, 321, and 331 of the first to third electric wires 31 to 33. Figure 10(b) shows, as an example, the case where the cross-sectional area of ​​the core wire 341 of the fourth electric wire 34 is 2 times or more the cross-sectional area of ​​the core wires 311, 321, and 331 of the first to third electric wires 31 to 33.

[0053] (Summary of the embodiments) Next, the technical concept understood from the first to third embodiments described above will be described using the reference numerals, etc., from the first to third embodiments. However, the reference numerals in the following description are not limited to the components, etc., specifically shown in the embodiments for the claims.

[0054] [1] A cable (3) having a plurality of electric wires (31-34) in which core wires (311, 321, 331, 341) made of metal conductors are covered with an insulator (312, 322, 332, 342), and a sheath (35) covering the plurality of electric wires (31-34), and an electronic component (imaging device 2) having a plurality of electrodes (201-204), wherein at its end the cable (3) each of the plurality of electric wires (311, 321, 331, 34 1) A cable connection structure (100) in which the insulators (312, 322, 332, 342) and the sheath (35) are cut together perpendicular to the longitudinal direction, and the tips of the core wires (311, 321, 331, 341), including the cross-sections (311a, 321a, 331a, 341a) of the cut core wires (311, 321, 331, 341), are soldered to the plurality of electrodes (31 to 34).

[0055] [2] The cable connection structure (100) described in [1] above, wherein the electronic component (2) has the plurality of electrodes (201-204) formed on a facing surface (electrode forming surface 20) that faces the end (300) of the cable (3), and the cross sections (311a, 321a, 331a, 341a) of each of the plurality of electric wires (31-34) and the plurality of electrodes (201-204) are aligned in a direction perpendicular to the facing surface (20) in at least a part of the arrangement.

[0056] [3] The cable connection structure (100) according to [1] above, wherein the insulator (312, 322, 332, 342) has thermal shrinkage properties, and the cross-section (312a, 322a, 332a, 342a) of the cut insulator (312, 322, 332, 342) is more constricted in the longitudinal direction of the cable (3) than the cross-section (311a, 321a, 331a, 341a) of the core wire (311, 321, 331, 341).

[0057] [4] The cable connection structure (100) according to [1] or [3] above, wherein the sheath (35) has thermal shrinkage properties, and the cross section (35a) of the cut sheath (35) is more constricted in the longitudinal direction of the cable (3) than the cross sections (311a, 321a, 331a, 341a) of the core wires (311, 321, 331, 341).

[0058] [5] The cable connection structure (100) described in [1] above, wherein an intervening (360-364) is arranged within the sheath (35), and the intervening (360-364) is cut together with the plurality of electric wires (31-34) and the sheath (35).

[0059] [6] The cable connection structure (100) according to [5] above, wherein the insulator (312, 322, 332, 342) has thermal shrinkage properties, and the cross-sections (312a, 322a, 332a, 342a) of the cut insulator (312, 322, 332, 342) are more deformed in the longitudinal direction of the cable (3) than the cross-sections (360a, 361a, 362a, 363a, 364a) of the intervening (360~364).

[0060] [7] The cable connection structure (100) according to [1] above, wherein at least one of the plurality of electric wires (31-34) has a different thickness of core wire (311, 321, 331, 341) than the other electric wires (31-33), and the plurality of electric wires (31-34) are not twisted together inside the sheath (35).

[0061] [8] The cable connection structure (100) described in [7] above, wherein an indicator (350) indicating the position of at least one electric wire (34) is provided on the outer surface (35b) of the sheath (35).

[0062] [9] A method for manufacturing a cable connection structure (100) comprising a cable (3) having a plurality of electric wires (31-34) in which core wires (311, 321, 331, 341) made of metal conductors are covered with an insulator (312, 322, 332, 342), and a sheath (35) covering the plurality of electric wires (31-34), and an electronic component (2) having a plurality of electrodes (201-204), wherein each of the plurality of electric wires (31-34) has a core wire (311, 321, 331, 341) and an insulator (312, 322, 332, 342) together with the sheath (35) A method for manufacturing a cable connection structure (100), comprising: a cutting step of cutting the cable (3) perpendicular to its longitudinal direction in a single motion; and a connecting step of aligning the cross-section (3a) of the cut cable (3) with the surface (20) of the electronic component (2) on which the plurality of electrodes (201-204) are formed, and connecting the ends of the core wires (311, 321, 331, 341) of the plurality of electric wires (31-34), including the cross-sections (311a, 321a, 331a, 341a), to the plurality of electrodes (201-204).

[0063]

[10] The method for manufacturing the cable connection structure (100) described in [9] above, wherein the connection step is a step of soldering by blowing hot air (H) onto the end (300) of the cut cable (3), and the insulator (312, 322, 332, 342) has thermal shrinkage properties, and the insulator (312, 322, 332, 342) is heated by the hot air (H) and shrinks in the longitudinal direction of the cable (3).

[0064]

[11] A method for manufacturing the cable connection structure (100) according to

[10] , wherein the sheath (35) has thermal shrinkage properties, and the sheath (35) is heated by the hot air (H) and shrinks in the longitudinal direction of the cable (3).

[0065] Although the first to third embodiments of the present invention have been described above, these embodiments do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention.

[0066] Furthermore, the present invention can be implemented with appropriate modifications without departing from its spirit. For example, in the above embodiment, the case in which the cable 3 has four wires (the first to fourth wires 31 to 34) was described, but the number of wires is not limited to this, and may be, for example, two, three, or five or more.

[0067] Furthermore, although the above embodiment described a case in which a cable connection structure 100 equipped with an imaging device 2 as an electronic component is used in an endoscope scope 10, the applications of the cable connection structure 100 are not limited to this, and it is possible to use the cable connection structure 100 in, for example, a small electrical device with an imaging function. In addition, other electronic components besides the imaging device 2, such as connectors or ICs (integrated circuits), may also be used. [Explanation of symbols]

[0068] 100…Cable connection structure 2…Imaging device (electronic components) 20…Electrode formation surface 201-204... Electrodes 1 through 4 3… Cable 3a…Cut surface 300...end 31-34...1st to 4th electric wires 311, 321, 331, 341… Core wires 311a, 321a, 331a, 341a...cross section 312,322,332,342…insulator 312a, 322a, 332a, 342a...cross section 35...Sheath 35a…Cross section 35b…Outer surface 350…Indicators 360…Central intervention (intervention) 361 to 364... The first to fourth side portions are interposed 360a, 361a, 362a, 363a, 364a... Cross-section H... Hot air

Claims

1. The device comprises a cable having multiple wires, each having a core wire made of a metal conductor covered with an insulator, and a sheath covering the multiple wires, and an electronic component having multiple electrodes. The cable is such that at its end, the core wires and insulators of each of the multiple electric wires are cut together with the sheath perpendicular to the longitudinal direction. The insulator has thermal shrinkage properties, The cross-section of the cut insulator is more constricted in the longitudinal direction of the cable than the cross-section of the core wire. The aforementioned plurality of electric wires are such that the ends of the core wires, including the cross-section of the cut core wire, are soldered to the plurality of electrodes, respectively. Cable connection structure.

2. The electronic component has the plurality of electrodes formed on the opposing surface of the cable that faces the end of the cable. The cross-sections of the core wires and the electrodes of each of the plurality of electric wires are aligned in a direction perpendicular to the opposing surface in at least a portion of the above. The cable connection structure according to claim 1.

3. The sheath has thermal shrinkage properties, The cross-section of the cut sheath is more constricted in the longitudinal direction of the cable than the cross-section of the core wire. The cable connection structure according to claim 1.

4. An intervening is placed within the sheath, The intervening is cut together with the plurality of electric wires and the sheath. The cable connection structure according to claim 1.

5. The cross-section of the cut insulator is more constricted in the longitudinal direction of the cable than the cross-section of the intervening element. The cable connection structure according to claim 4.

6. Of the aforementioned multiple electric wires, at least one electric wire has a different core wire thickness from the other electric wires. The plurality of electric wires are not twisted together inside the sheath. The cable connection structure according to claim 1.

7. An indicator showing the position of at least one electric wire is provided on the outer surface of the sheath. The cable connection structure according to claim 6.

8. A cable comprising a plurality of electric wires, each having a core wire made of a metal conductor covered with an insulator, and a sheath covering the plurality of electric wires, and an electronic component having a plurality of electrodes, The cable is such that at its end, the core wires and insulators of each of the multiple electric wires are cut together with the sheath perpendicular to the longitudinal direction. The sheath has thermal shrinkage properties, The cross-section of the cut sheath is more constricted in the longitudinal direction of the cable than the cross-section of the core wire. The aforementioned plurality of electric wires are such that the ends of the core wires, including the cross-section of the cut core wire, are soldered to the plurality of electrodes, respectively. Cable connection structure.

9. A method for manufacturing a cable connection structure comprising a cable having a plurality of electric wires, each having a core wire made of a metal conductor covered with an insulator, and a sheath covering the plurality of electric wires, and an electronic component having a plurality of electrodes, A cutting step of cutting each of the multiple electric wires, including the core wire and the insulator, together with the sheath, perpendicular to the longitudinal direction of the cable, A connection step of aligning the cut cross section of the cable with the surface of the electronic component on which the plurality of electrodes are formed, and connecting the ends of the core wires, including the cross sections of the core wires of the plurality of electric wires, to the plurality of electrodes, It has, The aforementioned connection step is a step of soldering by blowing hot air onto the cut end of the cable, The insulator has thermal shrinkage properties, and when heated by the hot air, the insulator shrinks in the longitudinal direction of the cable. A method for manufacturing a cable connection structure.

10. The sheath has thermal shrinkage properties, and the sheath is heated by the hot air and shrinks in the longitudinal direction of the cable. A method for manufacturing a cable connection structure according to claim 9.

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