JP6487094B2 - Cable mounting structure, cable connection structure, endoscope apparatus, and method for manufacturing cable mounting structure - Google Patents

Description

  The present invention relates to a cable mounting structure, a cable connection structure in which the cable mounting structure is connected to a substrate, an endoscope apparatus, and a method for manufacturing the cable mounting structure.

  In recent years, medical and industrial endoscopes have been widely used. As a medical endoscope, for example, there is an endoscope provided with an imaging device incorporating an imaging element such as a CCD at the distal end of an insertion portion to be inserted into a subject. By inserting this insertion part deeply into the body, a lesioned part can be observed, and further, when necessary, a treatment tool can be used in combination to examine and treat the body.

  In such an endoscope, in order to display an image on a monitor, the image information captured by the image sensor is converted into an electrical signal and transmitted to a signal processing device via a signal line, and the transmission signal is transmitted to the signal processing device. Process. Therefore, the image pickup device and the signal processing device in the endoscope are connected by a collective cable in which a plurality of cables are bundled for transmission of an image signal, transmission of a clock signal, supply of drive power to the image pickup device, and the like. ing.

  As a technique related to the connection of the collective cable, a technique is disclosed in which collective cables composed of a plurality of coaxial cables are collectively connected to a circuit board provided with electrodes (see, for example, Patent Document 1). In this technique, first, the front end portion of each coaxial cable is fixed by an array block, and a polishing process is performed so that the front end surface of the core wire of each coaxial cable matches the front end surface of the array block. And the front end surface of this core wire and the circuit board provided with the electrode are made to oppose, and both are connected via an anisotropic conductive sheet, a connection bump, etc. Further, an epoxy adhesive is applied and hardened around the connecting portion for reinforcement.

Japanese Patent No. 3863583

  Thus, by connecting the end face of the coaxial cable and the circuit board so as to face each other and further reinforcing the periphery with an adhesive, it is possible to maintain connection reliability in a normal use state. However, since the fluororesin with good sliding property is often used for the inner insulating layer covering the core wire, even if the periphery of the connecting portion is reinforced with an adhesive, the core wire cannot obtain a sufficient reinforcing effect, and is coaxial. When a large force is repeatedly applied from the outside of the cable, a load is generated on the core wire of the coaxial cable in a direction in which the core wire is peeled off from the circuit board, and the connection between the core wire and the electrode may be impaired. It was.

  The present invention has been made in view of the above, and an object thereof is to provide a cable mounting structure capable of maintaining the reliability of connection between a coaxial cable and a circuit board.

  In order to solve the above-described problems and achieve the object, a cable mounting structure according to the present invention is a cable mounting structure connected to a connection electrode of a board, the core wire formed by a conductor, and the core wire An inner insulating layer formed of an insulator around the inner insulating layer, a shield wire formed of a conductor around the inner insulating layer, and an outer insulating layer formed of an insulator around the shield wire, One coaxial cable and a fixing portion made of a sealing resin and covering one end of the coaxial cable. The coaxial cable in the fixing portion includes the inner insulating layer, the shield wire, and the outer insulating layer. An exposed portion removed so that at least a part of the peripheral surface of the core wire is exposed and at least a part of the shield wire remains, and the internal insulation around the core wire The shield wire and the covering portion in which the outer insulating layer remains, the connection surface of the fixed portion facing the substrate is planar, and the end surfaces of the core wire and the shield wire are exposed on the connection surface It is characterized by doing.

  In the cable mounting structure according to the present invention as set forth in the invention described above, the exposed portion is formed on a connection surface side of the fixed portion.

  The cable mounting structure according to the present invention is characterized in that, in the above-described invention, the exposed portion exposes half or more of the peripheral surface of the core wire.

  In the cable mounting structure according to the present invention as set forth in the invention described above, the exposed portion is such that the entire peripheral surface of the core wire is exposed.

  The cable mounting structure according to the present invention is characterized in that, in the above-described invention, the sealing resin forming the fixing portion has adhesion to a metal.

  In the cable mounting structure according to the present invention, a ground bar is provided on the side where the peripheral surface of the core wire is exposed so as to cover the exposed core wire.

  Further, the cable mounting structure according to the present invention, in the above invention, has a cable array member in which a groove portion in which the coaxial cable is disposed by fitting the coaxial cable is formed on the connection surface side, The cable arrangement member is fixed together with the coaxial cable by the fixing portion.

  In the cable mounting structure according to the present invention as set forth in the invention described above, the cable arraying member functions as a mask for shielding laser when the exposed portion of the coaxial cable is formed by laser processing.

  A cable connection structure according to the present invention includes a substrate on which a connection electrode is formed, and the cable mounting structure according to any one of the above that is electrically connected to the connection electrode of the substrate. The cable mounting structure is connected to the connection electrode via the core wire and the shield wire exposed at the end face.

  An endoscope apparatus according to the present invention includes a board on which a connection electrode is formed, the cable mounting structure according to any one of the above that is electrically connected to the connection electrode of the board, and the board. The cable mounting structure is connected to the connection electrode via the core wire and the shield wire exposed at the end face.

  Further, the manufacturing method of the cable mounting structure according to the present invention includes a fitting step for fitting the coaxial cable into the groove portion of the positioning member, and a laser irradiation from the outside of the positioning member, so that the peripheral surface of the core wire of the coaxial cable A removal step of forming an exposed portion in which at least a portion of the shielded wire of the coaxial cable remains and at least a portion of the shielded wire of the coaxial cable, and the coaxial cable including the exposed portion and the cable arranging member by a sealing resin. A fixing step of fixing, and a cutting step of cutting the fixing portion at a predetermined location to expose end faces of the core wire and the shield wire.

  According to the present invention, since the coaxial cable including the core wire is fixed by the fixing portion, even if a tensile load acts on the core wire of the coaxial cable after being connected to the substrate, the end surface of the core wire and the substrate It is possible to prevent the connection with the connection electrode from being broken, and to maintain the reliability of the connection between the cable and the substrate.

FIG. 1 is a perspective view showing a cable mounting structure according to Embodiment 1 of the present invention. FIG. 2 is a perspective view illustrating the cable connection structure according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view of the cable connection structure of FIG. 2 in a plane parallel to and perpendicular to the cable axial direction. FIG. 4 is a perspective view showing a cable mounting structure according to Modification 1 of Embodiment 1 of the present invention. FIG. 5 is a perspective view showing a cable mounting structure according to Modification 2 of Embodiment 1 of the present invention. FIG. 6 is a perspective view showing a cable mounting structure according to Modification 3 of Embodiment 1 of the present invention. FIG. 7A is a cross-sectional view of the cable connection structure of FIG. 6 in a plane parallel to and perpendicular to the cable axial direction. FIG. 7B is a cross-sectional view of the cable mounting structure according to the fourth modification of the first exemplary embodiment of the present invention on a plane that is parallel to and perpendicular to the cable axial direction. FIG. 7C is a cross-sectional view of the cable mounting structure according to the fifth modification of the first exemplary embodiment of the present invention on a plane parallel to and perpendicular to the cable axial direction. FIG. 8 is a perspective view for explaining a cable connection structure according to the second embodiment of the present invention. FIG. 9 is a flowchart for explaining the method for manufacturing the cable connection structure according to the second embodiment of the present invention. FIG. 10A is a diagram for explaining the method for manufacturing the cable connection structure according to the second embodiment of the present invention. FIG. 10B is a diagram for explaining the method for manufacturing the cable connection structure according to the second embodiment of the present invention. FIG. 10C is a diagram for explaining the method for manufacturing the cable connection structure according to the second embodiment of the present invention. FIG. 11 is a schematic diagram illustrating a schematic configuration of the endoscope apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for implementing the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. The drawings referred to in the following description only schematically show the shape, size, and positional relationship so that the contents of the present invention can be understood. That is, the present invention is not limited only to the shape, size, and positional relationship illustrated in each drawing.

(Embodiment 1)
FIG. 1 is a perspective view showing a cable mounting structure according to Embodiment 1 of the present invention. FIG. 2 is a perspective view illustrating a cable connection structure formed by connecting the cable mounting structure and the substrate according to the first embodiment of the present invention, and FIG. 3 is a cable of the cable connection structure of FIG. It is sectional drawing in a plane parallel to an axial direction and perpendicular | vertical. A cable mounting structure 10 shown in FIG. 1 includes a coaxial cable 1 and a fixing portion 6 made of a sealing resin and covering one end of the coaxial cable 1. In the first embodiment, as shown in FIG. 1, a structure in which three coaxial cables are fixed by one fixing portion 6 will be described as an example. However, the present invention is not limited to this, and one or more coaxial cables are used. Any device that uses a cable may be used.

  The coaxial cable 1 includes a core wire 2 formed of a conductor, an inner insulating layer 3 formed of an insulator around the core wire, a shield wire 4 formed of a conductor around the inner insulating layer 3, and a shield wire 4 And an outer insulating layer 5 formed of an insulator around the outer periphery of the substrate.

  In the cable mounting structure 10, the coaxial cable 1 in the fixed portion 6 includes an inner insulating layer 3 formed around the core wire 2, a shield wire 4 formed around the inner insulating layer 3, and the periphery of the shield wire 4. The outer insulating layer 5 formed on the exposed portion 11 is removed so that at least a part of the peripheral surface of the core wire 2 is exposed and at least a part of the shield wire 4 remains; The insulating layer 3, the shield wire 4, and the covering portion 12 in which the outer insulating layer 5 remains. A connection surface 9 of the fixing portion 6 that faces a later-described substrate is flat, and the end surfaces of the core wire 2 and the shield wire 4 are exposed on the connection surface 9. In the first embodiment, the exposed portion 11 may be formed in the central portion of the fixed portion 6 as long as it is within the fixed portion 6, but is formed on the connection surface 9 side from the viewpoint of connection reliability and reliability. It is preferable. Further, it is preferable that half or more of the axial length in the fixed portion 6 is the exposed portion 11, but the covering portion 12 exists in the fixed portion 6 from the viewpoint of connection reliability and reliability. Therefore, the axial length of the exposed portion 11 in the fixed portion 6 is preferably 3/4 or less.

  The fixing portion 6 is made of an electrically insulating sealing resin, and is a sealing resin having adhesiveness to a metal that is a material of the core wire 2, for example, copper, silver-plated copper, copper-coated steel, tin-plated copper, or the like. Is preferred. The sealing resin having adhesiveness means, for example, other resins excluding fluorine-based resins. In the first embodiment, the solid portion 6 is formed in a rectangular parallelepiped shape, but may be a columnar shape, an elliptical column shape, or the like as long as the connection surface 9 is a plane.

  The cable mounting structure 10 is temporarily fixed in a state where the coaxial cable 1 is aligned with the cable arrangement member, and the external insulating layer 5 in the portion that becomes the exposed portion 11 is removed by a laser processing machine or the like. Thereafter, the shield wire 4 and the internal insulating layer 3 are masked so that approximately half of them remain, and laser is irradiated to sequentially remove the shield wire 4 and the internal insulating layer 3 to form the exposed portion 11. . Next, a sealing mold is attached to the portions to be the exposed portion 11 and the covering portion 12 of the coaxial cable 1, and the sealing mold is filled with a sealing resin, cured, and removed, and then the coaxial cable 1 is removed. The fixing portion 6 is cut so that the end portions of the core wire 2 and the shield wire 4 are exposed, so that the connection surface 9 is formed. In addition, in order to arrange the coaxial cable 1 in the fixed part 6 at a predetermined interval, it is preferable to form the exposed part 11 and the fixed part 6 in a state where the coaxial cable 1 is aligned by two cable arranging members. . In the first embodiment, the exposed portion 11 has the external insulating layer 5 removed, but the external insulating layer 5 is also masked so that approximately half remains, as with the shield wire 4 and the internal insulating layer 3. You may leave about half by irradiating. Further, all the exposed peripheral surfaces of the coaxial cable 1 of the first embodiment are formed in the same direction (upper part), but by adjusting the positions of the laser processing masks of the plurality of coaxial cables 1, the core wire 2 is exposed. You may change the position of the surrounding surface.

  As shown in FIGS. 2 and 3, the cable mounting structure 10 is connected to the substrate 20 to form a cable connection structure 100. An electrode 21 for connection with the core wire 2 and an electrode 22 for connection with the shield wire 4 are formed on the connection surface 25 of the substrate 20 with the coaxial cable 1. The electrode 21 is formed in the same number as the core wire 2 at a position facing the core wire 2 in the cable mounting structure 10, and the electrode 22 is formed in a straight line at a position facing the plurality of shield wires 4. 4 are connected together. The electrode 22 may have a shape other than a straight line such as a curved line as long as it has a shape facing the plurality of shield wires 4.

  The cable mounting structure 10 and the substrate 20 are electrically connected via connection bumps 31a and 32b formed of solder, gold (Au), or the like. Further, a reinforcing resin 32 such as an epoxy resin is filled and applied between the connection surface 9 of the cable mounting structure 10 and the connection surface 25 of the substrate 20 and on the side surface of the fixing portion 6, so Sure.

  In Embodiment 1, since the core wire can be directly fixed by the fixing portion made of the sealing resin having good adhesiveness with the core wire, even when an external force is applied to the coaxial cable, the fixing portion firmly holds the core wire, The core wire can be reliably prevented from coming off.

  In the first embodiment, the exposed portion 11 of the cable mounting structure 10 has the peripheral surface of the core wire 2 exposed approximately half, but the peripheral surface of the core wire 2 can be exposed more than half. FIG. 4 is a perspective view of the cable mounting structure according to the first modification of the first embodiment.

  As shown in FIG. 4, in the cable mounting structure 10 </ b> A according to the first modification, 2/3 of the peripheral surface of the core wire 2 is exposed. In Modification 1, since the interval between the shield wires 4 is widened by making the exposed portion more than half of the peripheral surface, the sealing resin is easily penetrated and filled when the fixing portion 6 is formed, and a failure occurs. It is possible to prevent the generation of bubbles that can be a cause. Moreover, in the modification 1, when the length of the exposed part 11A in the axial direction is approximately the same as that of the first embodiment, the contact area between the core wire 2 and the fixing part 6 increases, and thus the core wire 2 and the fixing part 6 can be further improved, and the length of the exposed portion 11A in the axial direction can be shortened when the adhesive strength is set to the same level. Therefore, the axial length of the fixed portion 6 serving as a hard portion can be reduced. You can shorten it. In addition, it is preferable that 3/5 or more of the peripheral surface of the core wire 2 is exposed.

  Furthermore, in order to improve the connection strength with the fixing part 6 by increasing the exposed part of the core wire 2, the entire inner insulator 3 of the exposed part 11 </ b> B is removed in order to ensure the connectivity with the electrode 22 of the shield wire 4. May be. FIG. 5 is a perspective view of the cable mounting structure according to the second modification of the first embodiment.

  As shown in FIG. 5, in the cable mounting structure 10B according to the modified example 2, all of the inner insulator 3 of the exposed portion 11B is removed, and the entire peripheral surface of the core wire 2 in the exposed portion 11B is exposed. The internal insulator 3 is removed from the exposed portion 11B by laser irradiation in a masked state so that approximately half of the core wire 2 is exposed and approximately half of the internal insulator 3 and shield wire 4 remain, By irradiating a laser (for example, CO2 laser) that can selectively remove only the inner insulator 3 without affecting the shield wire 4, the inner insulator 3 can be removed while the core wire 2 and the shield wire 4 remain. That's fine. In the modified example 2, since the entire circumference of the core wire 2 can be exposed, the connection between the core wire 2 and the fixing portion 6 can be further improved, thereby further improving the reliability of the connection between the core wire 2 and the electrode 21. It can be further improved.

  Further, a ground bar may be provided on the side where the peripheral surface of the core wire 2 is exposed so as to cover the exposed core wire 2. FIG. 6 is a perspective view illustrating the cable connection structure according to the third modification of the first embodiment. FIG. 7 is a cross-sectional view of the cable connection structure of FIG. 6 on a plane parallel to and perpendicular to the cable axial direction.

  In the cable mounting structure 10C according to Modification 3, the ground bar 7 is provided on the side where the peripheral surface of the core wire 2 is exposed, that is, on the upper portion of the core wire 2 in FIG. 6 so as to cover the exposed core wire 2. As shown in FIG. 7A, the ground bar 7 is preferably longer than the length of the exposed core wire 2, that is, longer than the length of the exposed portion 11C in the axial direction. An electrode 23 for ground bar connection is formed at a position facing the ground bar 7 on the connection surface 25 of the substrate 20C connected to the cable mounting structure 10C. In the cable mounting structure 10C according to the modified example 3, after the internal insulator 3 and the shield wire 4 are removed, the ground bar 7 is fixed with a jig for positioning at a predetermined position, and then the sealing mold is filled with the sealing resin Then, the fixing part 6 may be formed. The jig for positioning the ground bar 7 is adjusted so that the core wire 2 and the ground bar 7 do not contact each other. In Modification 3, since the influence of noise generated on the side where the shield wire is removed on the core wire can be removed by the ground bar, the electrical characteristics of the cable connection structure can be improved.

  The ground bar may have a structure as shown in FIG. 7B. FIG. 7B is a cross-sectional view of the cable mounting structure according to the fourth modification of the first exemplary embodiment of the present invention on a plane that is parallel to and perpendicular to the cable axial direction. As the ground bar 7D of the cable mounting structure 10D according to the modified example 4, a thick bar is used so as to come into contact with the cross section of the shield wire 4. As shown in FIG. 7B, it is preferable that the ground bar 7D is in contact with or electrically connected to the shield wire 4 because a noise removing effect is obtained. In addition, it is preferable that the thickness of the ground bar 7 </ b> D is such that the position of the lower surface of the ground bar 7 </ b> D is the same position as the inner surface of the shield wire 4. This is because by setting the lower surface position of the ground bar 7D to the same position as the inner surface of the shield wire 4, the electrical characteristics of the exposed portion 11D and the covering portion 12D become closer. Further, the ground bar may have a structure as shown in FIG. 7C. FIG. 7C is a cross-sectional view of the cable mounting structure according to the fifth modification of the first exemplary embodiment of the present invention on a plane parallel to and perpendicular to the cable axial direction. The ground bar 7E of the cable mounting structure 10E according to the modified example 5 is not uniform in thickness in the axial direction, and is almost uniform from the connection surface 9, and then the thickness becomes closer to the covering portion 12E. It has a shape that gradually thickens. As shown in FIG. 7B, it is preferable that the ground bar 7E has a structure in which the thickness is reduced as it approaches the connection surface 9, because warpage due to a difference in linear expansion coefficient between the ground bar 7E and the sealing resin 9 is less likely to occur. .

(Embodiment 2)
Next, a cable connection structure according to the second embodiment of the present invention will be described. FIG. 8 is a perspective view illustrating the cable connection structure according to the second embodiment.

  The cable connection structure 100D according to the second embodiment is formed by connecting the cable mounting structure 10D and the substrate 20D. 10 C of cable mounting structures have the cable arrangement | positioning member 8 in which the groove part 8b which arranges the coaxial cable 1 was formed in the connection surface 9 side by fitting the coaxial cable 1. FIG. The width and height of the groove 8b are formed substantially the same as the outer diameter of the coaxial cable 1. In Embodiment 2, the cross-sectional shape orthogonal to the axial direction of the groove 8b is circular so that the bottom surface is in contact with the coaxial cable 1, but if the width direction is the same as the outer diameter of the coaxial cable 1, The cross section may be rectangular. The axial length of the groove 8b is the same as the length of the exposed portion 11D. The interval between the groove portions 8 b is formed in accordance with the desired interval between the coaxial cables 1, that is, the core wires 2. The cable array portion 8 is fixed together with the coaxial cable 1 by a fixing portion 6.

  A concave positioning portion 8 a is formed on the opposing surface of the outer peripheral portion of the cable array member 8. Moreover, the convex positioning part 24 which can be fitted to the positioning part 8a is provided in the part facing the positioning part 8a of the connection surface 25 of board | substrate 20D. In general, when connecting the core wire exposed on the end face of the coaxial cable and the electrode of the substrate, the positions of the core wire and the electrode are aligned by an imaging system of two fields of view. By previously forming the positioning portion 8a and the positioning portion 24 on the cable arraying member 8 and the board 20D of the cable mounting structure 10D, it is possible to omit positioning by the imaging system. The shape of the positioning portion 8a and the positioning portion 24 is not limited to the unevenness as long as positioning can be performed by fitting.

  Next, with reference to drawings, the manufacturing method of cable connection structure 100D concerning Embodiment 2 is demonstrated. FIG. 9 is a flowchart for explaining a manufacturing method of the cable connection structure 100D according to the second embodiment of the present invention. 10A to 10C are diagrams illustrating a method for manufacturing the cable connection structure 100D according to the second embodiment of the present invention. 10A to 10C are side views of the end face side where the core wire 2 of the coaxial cable 1 is exposed.

  First, as shown in FIG. 10A, the coaxial cable 1 is fitted into the groove 8b of the cable arranging member 8 to arrange the coaxial cable 1 (step S1). In order to arrange the coaxial cables at a predetermined interval in the fixing portion 6, it is preferable to fix the coaxial cable 1 with the two cable arrangement members 8.

  After arranging the coaxial cable 1 (step S1), as shown in FIG. 10B, the laser is irradiated obliquely from above the cable arranging member 8, and the external insulator 5, the shield wire 4 and the internal insulator 3 of the coaxial cable 1 are irradiated. Substantially the upper half is removed to form an exposed portion 11D (step S2). The coaxial cable 1 other than the portion fitted to the cable array member 8 is not exposed to the laser, or the exposed portion 11D is formed in a state where the laser is shielded by a mask so that the external insulator 5 and the like are not removed. By removing the upper half of the coaxial cable 1, approximately half of the peripheral surface of the core wire 2 is exposed. The cable array member 8 is made of a material that functions as a mask for shielding the laser, and the external insulation that is the upper half of the coaxial cable 1 is adjusted by adjusting the height of the groove 8b and the irradiation angle of the laser. The body 5, the shield wire 4 and the internal insulator 3 can be removed.

  After forming the exposed portion 11D (step S2), as shown in FIG. 10C, the cable arranging member 8 is fixed together with the coaxial cable 1 with a sealing resin (step S3), the end face side of the coaxial cable 1 is cut off, and the core wire 2 And the connection surface where the shield wire 4 is exposed is formed (step S4).

  After excision of the coaxial cable 1 (step S4), the cable mounting structure 10D and the substrate 20D are positioned by fitting the positioning portion 8a and the positioning portion 24, and the core wire 2 and the electrode 21, and the shield wire 4 and the electrode 22 are positioned. Are joined by bumps or the like (step S5).

  After joining the cable mounting structure 10D and the substrate 20D (step S5), a sealing resin is injected around the joint and cured to seal the joint (step S6).

  According to the manufacturing method of the cable connection structure 100D described above, the ratio of the exposure of the peripheral surface of the core wire 2 by appropriately setting the height of the groove 8b of the cable array member 8 serving as a mask and the laser irradiation angle. Can be easily adjusted. Moreover, since the positioning part 8a and the positioning part 24 are provided on the cable array member 8 and the board 20D, respectively, the core wire 2 and the electrode 21 can be easily aligned.

  In the first and second embodiments described above, the core wire 2 and the shield wire 3 of the coaxial cable 1 are bump-connected to the electrodes 21 and 22. For example, ACP (anisotropic conductive paste), ACF (anisotropic conductive film), etc. These anisotropic conductive materials may be used to electrically connect both.

  The first and second embodiments described above can be applied to, for example, an endoscope apparatus in which an imaging module is provided at the tip of a coaxial cable. An example in which the cable mounting structure 10 shown in FIG. 1 is applied to a medical endoscope apparatus that is introduced into a subject and images the inside of a body cavity will be described below.

  FIG. 11 is a diagram schematically illustrating the overall configuration of the endoscope system. As shown in FIG. 11, the endoscope device 51 includes an endoscope 52, a universal cord 56, a connector 57, a light source device 59, a processor (control device) 60, and a display device 63.

  The endoscope 52 captures an in-vivo image of the subject and outputs an imaging signal by inserting the insertion portion 54 that is the flexible tube portion 64 into the body cavity of the subject. The electric cable bundle inside the universal cord 56 extends to the distal end of the insertion portion 54 of the endoscope 52 and is connected to an imaging module provided at the distal end portion 61 of the insertion portion 54.

  The connector 57 is provided at the base end of the universal cord 56 and is connected to the light source device 59 and the processor 60, and performs predetermined signal processing on the image pickup signal output from the image pickup device at the distal end portion 61 connected to the universal cord 56. The image pickup signal is converted from analog to digital (A / D conversion) and output as an image signal.

  The light source device 59 is configured using, for example, a white LED. The pulsed white light that is turned on by the light source device 9 becomes illumination light that is irradiated toward the subject from the distal end of the insertion portion 54 of the endoscope 52 via the connector 57 and the universal cord 56.

  The processor 60 performs predetermined image processing on the image signal output from the connector 57 and controls the entire endoscope apparatus 51. The display device 63 displays the image signal processed by the processor 60.

  An operation unit 55 provided with various buttons and knobs for operating the endoscope function is connected to the proximal end side of the insertion unit 54 of the endoscope 52. The operation unit 55 is provided with a treatment instrument insertion port 67 for inserting treatment instruments such as a biological forceps, an electric knife and an inspection probe into the body cavity of the subject.

  The insertion portion 54 includes a distal end hard portion 61 provided with the imaging device, a bending portion 62 that is connected to the proximal end side of the distal end hard portion 61 and can be bent in a plurality of directions, and is connected to the proximal end side of the bending portion 62. It is comprised by the flexible tube part 64 provided. The bending portion 62 is bent by the operation of a bending operation knob provided in the operation portion 55, and can be bent in, for example, four directions, up, down, left and right, as the bending wire inserted into the insertion portion 54 is pulled and loosened. Yes.

  The endoscope 52 is provided with a light guide bundle (not shown) that transmits illumination light from the light source device 59, and an illumination lens (not shown) is arranged at the emission light emitting end of the light guide bundle. This illumination lens is provided at the distal end portion 61 of the insertion portion 54, and the illumination light is irradiated toward the subject.

  One end of the coaxial cable 1 shown in FIG. 1 is connected to the electrode of the switch at the operation unit 55. In addition, the cable mounting structure 10 that is the other end of the coaxial cable 1 reaches the distal end hard portion 61 through the insertion portion 54 and the curved portion 62, and the imaging element is disposed in the distal end hard portion 61. The cable mounting structure 100 is connected to the electrode 21 formed on the substrate 20. By applying the cable mounting structure 10 in this manner, even if a tensile load is generated on the core wire 10 in the coaxial cable 1 due to the deformation of the coaxial cable 1 accommodated in the insertion portion 54 and the bending portion 62, the fixing portion 6. Since the exposed core wire 2 is firmly held, the reliability of the connection between the core wire 2 and the electrode 21 can be maintained.

  The present invention can be used in a cable connection structure that requires high connection reliability between a coaxial cable and a substrate circuit.

DESCRIPTION OF SYMBOLS 1 Coaxial cable 2 Core wire 3 Inner insulation layer 4 Shield wire 5 Outer insulation layer 6 Fixed part 7 Ground bar 8 Cable arrangement member 8a, 24 Positioning part 8b Groove part 9, 25 Connection surface 10, 10A, 10B, 10C, 10D Cable mounting structure Body 11, 11A, 11B, 11C, 11D Exposed part 12, 12A, 12B, 12C, 12D Cover part 20, 20C, 20D Substrate 21, 22, 23 Electrode 31a, 31b Connection bump 32, Reinforcing resin 51 Endoscopic device 52 Endoscope 54 Insertion Unit 55 Operation Unit 56 Universal Code 57 Connector 59 Light Source Device 60 Processor 61 Hard Tip 62 Curved Unit 63 Display Device 64 Flexible Tube 67 Treatment Instrument Insertion Port 100, 100C, 100D Cable Connection Structure

Claims (10)

A cable mounting structure connected to a connection electrode of a board,
A core wire formed by a conductor, an inner insulating layer formed by an insulator around the core wire, a shield wire formed by a conductor around the inner insulating layer, and an insulator formed around the shield wire At least one coaxial cable having an external insulating layer formed;
A fixing portion made of a sealing resin and fixing one end of the coaxial cable;
The coaxial cable in the fixed portion is removed so that the inner insulating layer, the shielded wire, and the outer insulating layer are exposed so that the entire peripheral surface of the core wire is exposed and a part of the shielded wire remains. The exposed portion and the covering portion where the inner insulating layer, the shielded wire and the outer insulating layer remain around the core wire,
The cable mounting structure according to claim 1, wherein a connection surface of the fixing portion facing the substrate has a planar shape, and end surfaces of the core wire and the shield wire are exposed on the connection surface.   The cable mounting structure according to claim 1, wherein the exposed portion is formed on a connection surface side of the fixed portion.   The cable mounting structure according to claim 1, wherein the sealing resin forming the fixing portion has adhesiveness to metal.   The ground bar is provided on the side where the peripheral surface of the core wire is exposed so as to cover the exposed core wire, and the fixing portion adheres and fixes the ground bar. Cable mounting structure as described in one. On the connecting surface side, the coaxial cable is arranged by fitting the coaxial cable, and a cable array member in which a groove portion having a width equal to the outer diameter of the coaxial cable is formed,
The cable mounting structure according to claim 1, wherein the cable arranging member is fixed together with the coaxial cable by the fixing portion.   The cable mounting structure according to claim 5, wherein the cable arranging member is made of a material that shields a laser.   2. The cable mounting according to claim 1, wherein an axial length of the covering portion existing in the fixing portion is ¼ or more and ½ or less of an axial length of the fixing portion. Structure. A substrate on which connection electrodes are formed;
The cable mounting structure according to any one of claims 1 to 7, which is electrically connected to the connection electrode of the substrate,
The cable mounting structure is connected to the connection electrode via the core wire and the shield wire exposed on an end surface. A substrate on which connection electrodes are formed;
The cable mounting structure according to any one of claims 1 to 7, which is electrically connected to the connection electrode of the substrate,
An image sensor connected to an electrode formed on the substrate;
The endoscope is characterized in that the cable mounting structure is connected to the connection electrode via the core wire and the shield wire exposed at the end face. A fitting step for fitting the coaxial cable into the groove of the cable arrangement member;
A laser beam irradiation from the outside of the cable array member to remove the entire peripheral surface of the core wire of the coaxial cable and form an exposed portion in which a part of the shield wire of the coaxial cable remains,
A fixing step of fixing the coaxial cable including the exposed portion and the cable arranging member with a sealing resin,
Cutting the fixed portion at a predetermined location, and exposing the end surfaces of the core wire and the shield wire; and
The manufacturing method of the cable mounting structure characterized by including.

Images