JP2010092740A - Board-cable connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a board-cable connection structure which achieves miniaturization and low profile in the connection structure between a cable and a circuit board without deterioration of reliability of electrical connection between the cable and the circuit board. <P>SOLUTION: This board-cable connection structure includes: a circuit board 2; multiple cables 3; a relay connector 6 having an FPC for electrical relay connection between the multiple cables 3 and the circuit board 2; and a protective cover 7 that covers the relay connector 6 and regulates the relay connector 6 from moving in a direction receding from the circuit board 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is applied to a portable information device such as a cellular phone, for example, and relates to a board wire connection structure for electrically interconnecting an electric wire and a circuit board.

  As an example of a board wire connection structure for electrically interconnecting an electric wire and a circuit board, a board wire connection structure for connecting an electric wire and a circuit board via an electrical connector is disclosed (for example, Patent Document 1). Paragraph [0014] of Patent Document 1 states that “a cable connector 1 according to the present invention includes a receptacle connector 3 that is surface-mounted on a printed circuit board 2 as shown in FIG. It is composed of a plug connector 5 that is fitted from the vertical direction of the substrate 2 and soldered to the coaxial cable 4 ”. In addition, the paragraph number [0022] states that “the receptacle connector 3 is a female contact 3b in which legs connected to the printed circuit board 2 are alternately shortened, as shown in FIGS. In paragraph [0023], “the contact portion 3d of the female contact 3b is below the male contact 5b of the plug connector 5 as shown in FIG. 8C”. In the position, it extends substantially parallel to the surface of the printed circuit board 2 and rises substantially perpendicular to the printed circuit board 2 together with the contact part 5f of the male contact 5b, and is curved so as to contact the contact part 5f. It is described.

  That is, this electric wire connection structure for a board is applied for conducting a coaxial cable and a circuit board, and a receptacle connector that is surface-mounted on the circuit board, and a plug connector that fits into the receptacle connector from the vertical direction of the circuit board The receptacle connector has a female contact connected to the conductor portion of the circuit board, and the plug connector has a male contact whose one end is soldered to the coaxial cable. By fitting the receptacle connector and the plug connector, the female contact and the male contact are electrically connected, and the coaxial cable and the circuit board are electrically connected.

JP 2005-302417 A

  In a connection structure in which a cable (electric wire) and a circuit board are electrically connected via a pair of connectors, a fitting mechanism for fitting the connectors together is required. In order to ensure electrical contact between the male contact and the female contact, one of the contacts is often structured to be elastically held by the other contact from the vertical direction or the longitudinal direction (axial direction of the cable). For this purpose, it is necessary to provide a space for receiving at least one of the female connectors in a part of the male connector. Similarly, it is necessary to provide a recess for receiving at least part of the male connector in the female connector. For this reason, the connection structure in which the cable and the circuit board are electrically connected via a pair of connectors has limitations in reducing the size and height of the connector and reducing the mounting area of the circuit board. There is a demand for downsizing.

  As another method of connecting an electric wire to a circuit board, a method of directly connecting the core portion of the electric wire to a wiring conductor of the circuit board using a conductive adhesive for circuit connection or the like is known. However, in the wire connection structure connected by this method, when the wire is inadvertently pulled, a tensile force acts directly on the connection portion between the core wire portion and the wiring conductor, and there is a concern that the connection portion may be broken. was there. In addition, although the conductive adhesive has a relatively strong adhesive force in the shear direction acting parallel to the adhesive surface, the adhesive force in the perpendicular direction to the adhesive surface is relatively smaller than the adhesive force in the shear direction. Therefore, when the electric wire is twisted with respect to the bonding surface, in other words, when the electric wire that is parallel to the plate surface of the circuit board is pulled in the direction that is caused from the plate surface of the circuit board, the connection between the core wire portion and the wiring conductor is I was worried about disconnection.

  The present invention provides an electric wire connection structure for a substrate that can reduce the size and height of the structure of the connection portion between the electric wire and the circuit board without impairing the reliability of the electric connection between the electric wire and the circuit board. To do.

  One embodiment of the present invention covers a circuit board, a plurality of electric wires, a relay connection body having an FPC that electrically connects the plurality of electric wires and the circuit board, and covers the relay connection body. Provided is a board wire connection structure including a protective cover for restricting the relay connection body from moving in a direction to separate from the circuit board.

  Another aspect of the present invention includes a circuit board, a large number of electric wires, a relay connection body having an FPC that electrically connects the large number of electric wires and the circuit board, and both sides of the relay connection body. And a clamping unit that clamps and restricts the relay connection body from moving in a direction separating from the circuit board.

  According to one aspect of the present invention, since the electric wire and the circuit board are connected via the relay connection body, the structure of the connecting portion between the electric wire and the circuit board is reduced in size and reduced in height as compared with the case where the connector is used. can do. In addition, the relay connection body is restricted by the protective cover or clamping unit from moving in the direction in which the relay connection body is separated from the circuit board, and stress acts on the connection between the core part of the electric wire and the wiring conductor of the circuit board. Is prevented. Thereby, even if inadvertent tension acts on the electric wire, the reliability of the electrical connection between the electric wire and the circuit board can be maintained.

  Specific examples of embodiments of the present invention will be described below in detail with reference to the drawings. This embodiment relates to an electric wire connection structure for a substrate that can be used in one typical application. Typical applications include, but are not limited to, information terminal devices such as foldable and slide type mobile phones and smart phones. The electric wire connection structure for a substrate according to the present invention electrically interconnects an electric wire (small-diameter coaxial cable) and a circuit board, and the circuit board and a large number of electric wires arranged in a horizontal row, A relay connection body having an FPC electrically connected to a number of electric wires on one end side and electrically connected to a circuit board on the other end side; and an electric wire so that the relay connection body is not separated from the circuit board. Protecting means for protecting the electrical connection state of the circuit board. As the protection means, as will be described later, a protection cover and a clamping unit are illustrated, but the protection means is not limited thereto.

  Below, 1st Embodiment of the electric wire connection structure for substrates which concerns on this invention is described. As shown in FIG. 1, the board electric wire connection structure 1 of the present embodiment includes a circuit board 2, a large number of cables 3 arranged in a horizontal row, a core portion 4 a of the cable 3, and a shield layer 4 c. A relay connection body 6 that is relay-connected to the conductor portion 5 (see FIG. 4) of the circuit board 2 and a protective cover (protection means) 7 that covers the relay connection body 6 are provided.

  Examples of the circuit board 2 include PCB (Printed Circuit Board) and flexible FPC (Flexible Printed Circuit), but are not limited thereto. The FPC is a circuit board in which a conductor portion is arranged on the surface of a base material made of a material such as polyimide having a thickness of several μm to 100 μm, for example, and has flexibility.

  As one typical form of PCB, there can be mentioned a structure in which a large number of wiring conductors are printed in a predetermined pattern on an insulating base material composed of an epoxy resin or the like. As will be described later, in the case of the first embodiment in which the FPC 9 of the relay connection body 6 is bonded to both the front and back surfaces of the flat plate 11 in a state of being bent in a U shape in advance, from the lower surface side of the circuit board 2, Since it is necessary to heat an adhesive for circuit connection disposed between the circuit board 2 and the relay connection body 6 by a heater (not shown), the circuit board 2 is made of a material and thickness that does not significantly impair heat conduction. Are preferably used. When one end of the FPC 9 is connected (fixed) to the circuit board 2 and then bent to the U shape together with the circuit board 2, the circuit board 2 is selected without causing a problem of thermal conductivity. can do. One end of the wiring conductor is exposed at a position on the circuit board 2 to which the relay connection body 6 is fixed at a position corresponding to a large number of conductor portions of the relay connection body 6.

  One form of the cable 3 is a thin coaxial cable having an outer diameter of about 0.3 mm. The cable 3 shown in FIG. 1 has a conductive core wire portion 4a disposed at the center, an insulating inner coating 4b formed on the outer side of the core wire portion 4a, and a shield layer 4c formed on the outer side of the inner coating 4b. An insulating outer coating 4d is formed outside the layer 4c. Thus, the cable 3 has a multi-layer structure, the core wire portion 4a for transmitting signals and the shield layer 4c are insulated from each other by the inner coating 4b, the signal current is protected from noise by the shield layer 4c, and the EMI characteristics are improved. It has come to be.

  The cable 3 is subjected to terminal processing so that the outer coating 4d and the inner coating 4b on the distal end side are stripped to a predetermined length, and the core wire portion 4a and the shield layer 4c are exposed. The noise current flowing through the shield layer 4c is caused by the ground connection wiring conductor (see FIG. 4) provided on the surface of the circuit board 2 via the ground bar 8 and the ground conductor portion 10b (FIG. 4) of the FPC 9 of the relay connection body 6. (Not shown).

  A large number of cables 3 are arranged in a horizontal row, and a shield layer 4c is held between a pair of ground bars 8 (see FIGS. 1 and 4). The electrical connection between the ground bar 8 and the shield layer 4c can be performed by brazing or the like. An electric wire set is composed of a large number of cables 3 and a pair of ground bars 8. The ground bar 8 is formed by punching a plate material such as a conductive copper alloy by a press. Through the ground bar 8, the shield layers 4c of all the cables 3 are connected together.

  3 and 4, as shown in FIGS. 3 and 4, the flat plate 11 has a longitudinal dimension W of 2 mm or less, a height dimension T of 1 mm or less, and a lateral width dimension L of 15 mm or less. However, the present invention is not limited to this. The FPC 9 can be bonded to both the front and back surfaces of the flat plate 11 while leaving both sides of the flat plate 11. As described in the second embodiment and the third embodiment, a relay connection body in which the FPC 9 is bonded to one surface of the flat plate 11 can also be used. The adhesive includes a thermoplastic adhesive, a thermosetting adhesive, a pressure-sensitive adhesive sheet, and the like, and the adhesive is not limited to a specific one.

  In the present embodiment, the FPC 9 is bent into a U shape and bonded to both the front and back surfaces of the flat plate 11. The long flat plate 11 may be a metal or a resin material as long as the flatness in the longitudinal direction (width direction) can be formed with a predetermined accuracy. It is preferable. The thickness of the flat plate 11 can be any thickness as long as the required strength is obtained, and preferably the thickness can be about 0.2 mm. In this case, the material of the flat plate 11 can be stainless steel.

  As the FPC 9, a substrate in which a conductor portion is arranged on a base material made of a material such as polyimide having a thickness of about several μm to 100 μm can be used. The conductor portion is covered with a resist (insulating coating material) except for a portion necessary for electrical connection with the circuit board 2 and the cable 3. One surface of the FPC 9 is formed as an adhesive surface, and the other surface is formed as an electrical contact surface. The electrical contact surface is in contact with the conductor portion 10 a connected to the core wire portion 4 a of the cable 3, the conductor portion 10 b connected to the shield layer 4 c of the cable 3 via the ground bar 8, and the conductor portion 5 on the circuit board 2. And a conductor portion (not shown) for contacting the ground wiring conductor on the circuit board 2.

  In this embodiment, since the FPC 9 is bonded to the flat plate 11 with good flatness by the adhesive sheet 12 (FIG. 1), the height variation of the conductor portions 10a and 10b on the respective electric contact surfaces can be suppressed to be small. When the relay connection body 6 or the circuit board 2 is deformed by the pressure at the time of thermocompression bonding, a restoring force for restoring from the deformed state acts on the connection portion, and the relay connection body 6 may be separated from the circuit board 2. However, in this embodiment, since the conductor portions 10a and 10b of the FPC 9 and the conductor portion 5 of the circuit board 2 can be connected without applying excessive pressure, deformation of the relay connection body 6 or the circuit board 2 is suppressed. Thus, the stress acting on the connection portion is reduced, and the reliability of the connection portion can be improved.

  In FIG. 3, the conductor portions 10 a and 10 b of the FPC 9 bonded to the front surface side of the flat plate 11 are connected to the core wire portion 4 a and the ground bar 8 of the cable 3 by brazing and bonded to the back surface side of the flat plate 11. Further, a state is shown in which the conductor portion of the FPC 9 is connected to the conductor portion 5 (FIG. 4) of the circuit board 2 by thermocompression bonding via an adhesive for circuit connection (an anisotropic conductive adhesive or the like). . As shown in the drawing, the surface side of the relay connection body 6 is exposed, but can be covered with a shield shell. In this case, an opening can be formed in the shield shell at a portion corresponding to the cable lead-out side. In addition, a plurality of holes for brazing are formed in the shield shell so that the ground bar 8 and the shield shell are brazed, and a latch or the like is used to lock the shield shell to the relay connection body 6. A stopping means may be provided. It is also possible to electrically connect the protective cover 7 of the present embodiment to the ground bar 8 by brazing or the like so that the same function as the shield shell can be achieved. By doing in this way, the connection part of the relay connection body 6 and the circuit board 2 or the cable 3 is shielded, and EMI characteristic can be improved.

  By using the relay connection body 6 in place of the conventional connector having a connector housing and terminals, the mounting area can be reduced, and the length of the relay connection body 6 (the length direction of the cable 3) is also outside the cable 3. The length can be reduced to substantially the same as the length of the portion from which the coating 4d has been removed. Further, the width of the relay connection body 6 (direction in which the cables 3 are arranged) can be made substantially the same as the width of the multiple cables 3.

  The protective cover 7 can be press-molded from, for example, a metal panel. As shown in FIG. 2, a bulging portion 15 bulged to a size corresponding to the shape of the relay connector 6, and a bulging portion 15 and a flat portion 16 fixed to the circuit board 2. The flat portion 16 is continuously connected to the edge of the bulging portion 15, and the back surface is a fixed surface that is fixed to the upper surface of the circuit board 2 with an adhesive or the like. The bulging portion 15 has a ceiling wall 15a and a peripheral wall 15b following the edge 15c of the ceiling wall 15a.

  An opening 21 through which a large number of cables 3 are led out is formed in the peripheral wall 15 b of the bulging portion 15. The height of the bulging portion 15 is approximately the same as that of the relay connection body 6 to which the cable 3 is connected, and the ceiling wall of the bulging portion 15 is in a state where the protective cover 7 is fixed to the circuit board 2. It is preferable to set so that no gap is formed between the inner surface of 15a and the upper ground bar 8. A direction Z in which the relay connection body 6 is separated from the circuit board 2 by the inner surface of the ceiling wall 15a of the bulging portion 15 being in contact with the upper ground bar 8, in other words, a direction in which the relay connection body 6 is lifted from the circuit board 2 (up and down The movement to the direction Z is restricted, and the cable 3 and the circuit board 2 are prevented from being separated due to stress acting on the connection portion between the cable 3 and the circuit board 2 due to careless pulling of the cable 3. Moreover, the shield connection property of the electric wire connection structure 1 is enhanced by covering the relay connection body 6 with the bulging portion 15 in a state of being electrically connected to the protective cover 7.

  FIG. 5 shows a modification of the first embodiment. As shown in the drawing, a long bar (separation preventing member) 17 for preventing the relay connection body 6 from being separated from the circuit board 2 is provided around the multiple cables 3 as a retrofit. The long bar 17 can be made from any material having the required strength, for example, it can be made from a thermoplastic resin material. When it is provided later, the cable 3 can be provided so as to be sandwiched between the upper and lower resin members 18a and 18b. A long bar can be integrally provided on a large number of cables 3, and in this case, the long bar can be resin-molded. In the protective cover 7, locking walls 20 (peripheral walls 15 b) that lock both side portions of the long bar 17 are provided on both sides of the opening 21 through which the cable 3 leads. When the cable 3 is pulled, the long bar 17 comes into contact with the inner surface of the locking wall 20, so that the relay connection body 6 is restricted from moving in the front-rear direction Y, and the relay connection body 6 has a large number of cables. 3 together with the circuit board 2 is prevented.

  Note that, for example, an adhesive is applied to the surface of the long bar that comes into contact with the cable, the circuit board, and the protective cover to give adhesiveness, and the opening 21 formed in the peripheral wall 15b of the bulging portion 15 is formed with the long bar. It may be sealed. Alternatively, the long bar is made of an elastic material integrally formed around the multiple cables 3, and the long bar is elastically compressed between the protective cover and the circuit board, so that the peripheral wall 15b of the bulging portion 15 is obtained. It is also possible to seal the opening 21 formed in the above with a long bar. By sealing the opening 21 with a long bar, liquid such as water and dust can be prevented from entering the protective cover 7.

  Next, a second embodiment of the board wire connecting structure according to the present invention will be described. As shown in FIGS. 6 to 8, in the board wire connection structure 51 of the present embodiment, both side portions of the flat plate 11 of the relay connection body 6 are clamped on the circuit board 2 by the clamping unit (protection means) 63. This is different from the board wire connection structure 1 of the first embodiment in that the protective cover 7 is not used.

  As with the protective cover 7 shown in FIG. 1, the clamping unit 63 restricts the relay connection body 6 from moving in the direction separating from the circuit board 2, mainly in the vertical direction Z, and by inadvertent pulling of the cable 3, This prevents stress from acting on the connecting portion between the core wire portion 4 a and the conductor portion 5 of the circuit board 2. The clamping unit 63 of the present embodiment includes a base member 64 fixed on the circuit board 2 and a cover member 66 connected to the base member 64 via a connecting pin 65 so as to be opened and closed. However, the present invention is not limited to this (FIGS. 7 and 8). The base member and the cover member may be detachable without being connected via a connecting pin.

  As shown in FIGS. 7 and 8, the base member 64 can be formed by punching and bending a thin metal panel with a press, for example, and has a bottom wall 67 and both side walls 68. The end of the relay connection body 6 (the end of the flat plate 11) can be attached from the insertion end that is open at one end of the side walls 68. On the opposite side of the insertion end, connecting pins 65 are attached to both side walls 68 by press fitting, and a cover member 66 is rotatably connected to the connecting pins 65. The lower surface of the bottom wall 67 of the base member 64 is a fixed surface that is fixed to the upper surface of the circuit board 2 by an adhesive or brazing. On the outer surface of both side walls 68 that stand upright from the bottom wall 67 of the base member 64, a locking projection 69 that engages with a locking hole 74 provided in the side wall 73 of the cover member 66 is projected. The locking protrusion 69 can have an inclined surface on which the tip of the side wall 73 of the cover member 66 slides, and an engaging surface that contacts the edge of the locking hole 74 following the inclined surface. The ends of the flat plate 11 of the relay connection body 6 are attached between the side walls 68 of the base member 64, and the relay connection body 6 is arranged in the opposite direction of the side walls 68, that is, the front-rear direction Y shown in FIG. Movement is regulated.

  Similarly to the base member 64, the cover member 66 can be formed by punching a thin metal panel with a press and bending it, and has an upper wall 72 and both side walls 73. A tongue-shaped contact piece 75 that curves downward from the root side to the tip side at the end of the upper wall 72 on one side of the both side walls 73 and extends inward is connected to the connecting pin 65 on the other side of the side walls 73. A pair of connecting pieces 76 are provided. The contact piece 75 is provided so as to be in contact with the upper surface of the flat plate 11 and moves together with the flat plate 11 in a direction Z in which the relay connection body 6 is lifted from the circuit board 2, that is, in a direction in which the relay connection body 6 is separated from the circuit board 2. To regulate. Locking holes 74 are provided in both side walls 73 of the cover member 66, the side wall 73 of the cover member 66 overlaps the outer surface of the side wall 68 of the base member 64, and the locking hole 74 engages with the locking protrusion 69. The cover member 66 is locked to the base member 64.

  In addition, since the clamping unit 63 of this embodiment is provided with the mechanical lock mechanism, the unclamped state can be obtained by releasing the locking and opening the cover member 66. In the unclamped state, the relay connector 6 can be replaced or maintained.

  9 and 10 show a modification of the second embodiment. In this modification, the base member 84 of the clamping unit 83 is formed as one component. In the relay connection body 91, the FPC 89 is bonded only to one side of the flat plate 82. The FPC 89 extends from one end to the other end, one end connected to the cable 3 is fixed to the flat plate 82, and the other end is fixed to the circuit board 2 by thermocompression bonding with a circuit adhesive. .

  In this modification, the relay connection body 91 is fixed so that the surface of the FPC 89 to which the cable 3 is connected faces the circuit board 2. By fixing in this manner, the FPC 89 and the circuit board 2 can be easily aligned, and the flat plate 82 covers the connection portion between the cable 3 and the FPC 89. Can be prevented. Further, since the FPC 89 only needs to have the conductor portion exposed on one side, the configuration of the FPC 89 itself can be simplified, and the vias for conducting the conductors on the upper and lower surfaces of the FPC 89 are not necessary. can do.

  As shown in detail in FIG. 11, cover members 86 are rotatably connected to both sides of the base member 84 via connecting pins 85. As shown, both sides of the flat plate 82 of the relay connection body 91 are clamped between both side portions of the base member 84 and the cover member 86 that opens and closes.

  The base member 84 includes a bottom wall 87, side walls 88 that stand vertically on both side portions of the bottom wall 87, and a pair of bent pieces 90 a and 90 b that face the side walls 88. A connecting pin 85 is press-fitted into a through hole formed in one bent piece 90a and a side wall 88 facing the bent piece 90a. A U-shaped connecting portion 97 formed at one end of the cover member 86 is rotatably connected to the connecting pin 85. The other bent piece 90 b is formed with a locking hole 94 that engages with a locking projection (not shown) provided on the side wall 93 of the cover member 86. A locking hole 94 is also formed in the side wall 88 of the base member 84 at a position facing the locking hole 94 formed in the bent piece 90b. By engaging the locking projections provided on the side wall 93 of the cover member 86 with the two locking holes 94 provided on the bent piece 90b and the side wall 88, the cover member 86 is locked to the base member 84, and the base Both sides of the flat plate 82 of the relay connection body 91 are clamped between the member 84 and the cover member 86.

  The cover member 86 is rotatable to the upper wall 92, the side wall 93 that overlaps the side wall 88 of the base member 84 and the bent piece 90 b following the edge of the upper wall 92, and the connecting pin 85 provided on the base member 84. And a U-shaped connecting portion 97 to be connected. The side wall 93 is formed with a locking projection at a position where it engages with a side wall 88 of the base member 84 and a locking hole 94 formed in the bent piece 90b. The cover member 86 is preferably formed to a size that is elastically sandwiched between the side wall 88 of the base member 84 and the pair of bent pieces 90b. Thereby, rattling between the base member 84 and the cover member 86 in the clamped state can be effectively prevented.

  In the clamped state of the clamping unit 83, both sides of the flat plate 82 of the relay connection body 91 are clamped between the bottom wall 87 of the base member 84 and the upper wall 92 of the cover member 86. The relay connecting body 91 is restricted from moving in the left-right direction X because the flat plate 82 is positioned between both side walls 88 of the base member 84, and the flat plate 82 is between the pair of bent pieces 90 a and 90 b of the base member 84. When the flat plate 82 is located between the bottom wall 87 of the base member 84 and the upper wall 92 of the cover member 86, the movement in the vertical direction Z is restricted. (See FIG. 9). In this modification, a portion corresponding to the tongue-shaped contact piece 75 shown in FIG. 7 may be provided on the base member 84 or the cover member 86.

  FIG. 12 shows another modification of the second embodiment. As shown in the figure, this modification includes a protective cover 7 that covers the relay connection body 91 and the clamping unit 83, and a long bar 110 that is integrally provided around a large number of cables 3. It is. Since the protective cover 7 corresponds to the protective cover 7 shown in FIG. 2, overlapping description of the protective cover 7 is omitted. By covering the relay connection body 91 with the protective cover 7, the shield characteristic of the wire connection structure 101 is enhanced.

  As shown in FIG. 13, the long bar 110 is preferably provided integrally with a large number of cables 3 by resin molding so that there are no gaps, and is formed in the peripheral wall 15 b of the bulging portion 15. 21 is for sealing. By sealing the opening 21 with the long bar 110, it is possible to prevent liquid or dust such as water from entering the protective cover 7 from the outside, and the waterproofness of the connection portion between the cable 3 and the circuit board 2 can be prevented. Dustproofness can be improved. Further, when the long bar 110 comes into contact with the locking wall 20 (see FIG. 5) of the protective cover 7, the relay connecting body 91 is restricted from moving in the front-rear direction Y.

  The long bar 110 is a member corresponding to the long bar 17 shown in FIG. 5, and the opening 21 may be sealed by applying an adhesive to the long bar 110, or the long bar 110. May be sealed elastically between the protective cover 7 and the circuit board 2 to seal the opening 21.

  Next, a third embodiment of the circuit board wire connecting structure according to the present invention will be described. As shown in FIGS. 14 to 18, in the board electric wire connection structure 121 of the present embodiment, the clamping unit 143 that clamps both side portions of the flat plate 132 of the relay connection body 131 is provided at the periphery of the circuit board 150. The clamping unit 83 is different from the board wire connection structures 81 and 101 of the second embodiment provided on the circuit board 150 in that the clamping unit 83 is provided in the provided recess 151. By arranging the board wire connection structure 121 in the recess 151, the board wire connection structure 121 is prevented from protruding in the thickness direction of the circuit board 150, and the height dimension can be kept low. The casing is made thinner.

  As shown in FIGS. 14 and 15, a recess 151 having a size corresponding to the clamping unit 143 is provided in the peripheral portion on one side of the circuit board 150. The clamping unit 143 is disposed so as to be generally accommodated in the recess 151. The clamping unit 143 is fixed to the circuit board 150 by soldering a pair of arm portions 145 extending in the width direction from both sides of the base member 144 to the upper surface of the circuit board 150. It is not limited to. The clamping unit 143 and the circuit board 150 can be fixed by bonding with an adhesive, screwing, snap fitting, or the like. Alternatively, instead of fixing the clamping unit 143 to the circuit board 150, an adhesive is provided on the back surface of the base of the clamping unit 143 so that the inner surface of the casing in which the circuit board 150 is accommodated, for example, a mobile phone The clamping unit 143 may be fixed.

  FIG. 16 shows a view of the relay connection body 131 clamped by the clamping unit 143 of the present embodiment as viewed from the back side. On one side of the FPC 133, the core wire portion 4a of the cable 3 is brazed to the signal wiring conductor 10a exposed on the back surface. A pair of ground bars 8 connected to the shield layer 4 c of the cable 3 is brazed to the ground wiring conductor 10 b of the FPC 133. A flat plate 132 is bonded to the surface of the FPC 133 with an adhesive or the like. Both side portions of the flat plate 132 extend to both sides in the width direction of the FPC 133, and the extended portions are clamped by the clamping unit 143. On the other side of the FPC 133, the signal wiring conductor 10a is exposed on the back surface of the FPC 133 that is thermocompression bonded to the circuit board 150.

  FIG. 17 shows the clamping unit 143 disposed in the recess 151 of the circuit board 150. The base member 144 is the same as the base member 84 shown in FIG. 11 except that the base member 144 is fixed to the circuit board 150 with a pair of arm portions 145. Cover members 146 are coupled to both sides of the base member 144 via a coupling pin 85 so as to be rotatable. The connecting pin 85 is press-fitted into a through-hole formed in one bent piece 90a and a side wall 88 facing the bent piece 90a.

  The base member 144 includes a bottom wall 87, side walls 88 that stand vertically on both side portions of the bottom wall 87, and a pair of bent pieces 90 a and 90 b that face the side walls 88. A connecting pin 85 is press-fitted into one bent piece 90a, and a locking hole 94 is formed in the other bent piece 90b to engage with a locking projection 153 provided on the side wall 93 of the cover member 146. A locking hole 94 is also formed in the side wall 88 of the base member 144 at a position facing the locking hole 94 formed in the bent piece 90b. By engaging the locking protrusions 153 provided on the side wall 93 of the cover member 146 with the two locking holes 94 provided on the bent piece 90b and the side wall 88, the cover member 146 is locked to the base member 144, Both sides of the flat plate 132 of the relay connection body 131 are clamped between the base member 144 and the cover member 146. Each side wall 88 is provided with an arm portion 145 that is fixed to the circuit board 150. The arm portion 145 is bent so that the base side continues to the side wall 88 and the distal end side continuing to the base side is parallel to the circuit board 150. The arm portion 145 has a flat surface on the tip side bonded to the circuit board 150.

  The cover member 146 is the same as the cover member 86 shown in FIG. The upper wall 92, the side wall 93 overlapping the side wall 88 and the bent piece 90b of the base member 144 following the edge of the upper wall 92, and a U-shaped connecting portion 97 that is rotatably connected to the connecting pin 85 are provided. is doing. The side wall 93 is formed with a locking projection 153 at a position where it engages with the side wall 88 of the base member 144 and a locking hole 94 formed in the bent piece 90b.

  FIG. 18 shows a state where the relay connection body 131 is attached to the clamping unit 143 in an unclamped state. Both side portions of the flat plate 131 are located between both sides of the base member 144 and the cover member 146. By closing the cover member 146 from the unclamped state, both side portions of the flat plate 132 are clamped between both sides of the base member 144 and the cover member 146. As shown in FIG. 15, in the clamped state, it is preferable that both side portions of the flat plate 132 are in contact with the lower surface of the upper wall 92 of the cover member 146 without a gap, and both side portions of the flat plate 132 are It is preferable to be in contact with the inner surface of the side wall 93. Thereby, the relay connection body 131 can be fixed by the clamping unit without rattling. In this embodiment, a portion corresponding to the tongue-shaped contact piece 75 shown in FIG. 7 may be provided on the base member 144 or the cover member 146.

  According to the third embodiment, the relay connection body 131 is restricted from moving in the left-right direction X, the front-rear direction Y, and the up-down direction Z by the clamping unit 143, and the clamping unit 143 is recessed in the circuit board 150. By being arranged at the location 151, the clamping unit 143 is prevented from protruding on the circuit board 150. Accordingly, it is possible to further promote the reduction in size and height of the connection structure 121 of the present embodiment.

  As mentioned above, although embodiment of the electric wire connection structure for substrates which concerns on this invention was described, this invention is not restrict | limited to disclosed embodiment, Implementation in another form can be accept | permitted.

It is sectional drawing which shows 1st Embodiment of the electric wire connection structure for substrates which concerns on this invention. It is a perspective view of the electric wire connection structure for substrates shown in FIG. It is a perspective view of a relay connection body. It is a disassembled perspective view of the relay connection body shown in FIG. It is a perspective view which shows the modification of the electric wire connection structure for substrates of 1st Embodiment. It is sectional drawing which shows 2nd Embodiment of the electric wire connection structure for substrates which concerns on this invention. It is a perspective view which shows the state in which the cover member of a clamping unit is open. It is a perspective view which shows the state which the cover member of the clamping unit has closed. It is a perspective view which shows the modification of the electric wire connection structure for substrates of 2nd Embodiment. It is sectional drawing of the electric wire connection structure for substrates shown in FIG. It is a perspective view of a clamping unit. It is a perspective view which shows the modification of the electric wire connection structure for substrates of 2nd Embodiment. It is a perspective view which shows the elastic member provided in many cables. It is a perspective view which shows 3rd Embodiment of the electric wire connection structure for substrates which concerns on this invention. It is a partial cross section figure of the electric wire connection structure for substrates shown in FIG. It is a perspective view which similarly shows the relay connection body of the electric wire connection structure for substrates shown in FIG. It is a perspective view which shows the state in which the cover member of a clamping unit is open. FIG. 18 is a perspective view illustrating a state where a relay connection body is set in the clamping unit illustrated in FIG. 17.

Explanation of symbols

1, 51, 81, 101, 121 Wire connection structure for board 2,150 Circuit board 3 Cable 4a Core part 6, 91, 131 Relay connection body 7 Protective cover 9, 59, 89, 133 FPC
11, 82, 132 Flat plate 15 Swelling portion 15a Ceiling wall 15b Peripheral wall 16 Flat portion 17 Long bar 21 Opening 63, 83, 143 Clamping unit 64, 84, 144 Base member 66, 86, 146 Cover member 67, 87 Bottom wall 69 Locking protrusion 72, 92 Upper wall 74, 89 Locking hole 75 Contact piece

Claims (8)

A circuit board;
Many wires,
A relay connector having an FPC that electrically relay-connects the multiple wires and the circuit board;
A protective cover that covers the relay connection body and restricts the relay connection body from moving in a direction separating from the circuit board;
An electric wire connection structure for a board comprising:   The protective cover has a ceiling wall and a peripheral wall that continues to an edge of the ceiling wall, and the relay connection body contacts the inner surface of the ceiling wall, whereby the relay connection body is separated from the circuit board. The electric wire connection structure for a board according to claim 1, wherein movement to the right is restricted.   When the separation preventing member is mounted around the multiple electric wires, and the multiple electric wires are pulled, the separation preventing member abuts on the inner surface of the peripheral wall of the protective cover, so that the relay connection body is The electric wire connection structure for a board according to claim 2, wherein movement in a direction separating from the circuit board is restricted.   The opening which leads the said many electric wires in the said surrounding wall of the said protective cover is formed, and the sealing member which seals the said opening is integrally provided in the said many electric wires. Wire connection structure for board. A circuit board;
Many wires,
A relay connector having an FPC that electrically relay-connects the multiple wires and the circuit board;
A clamping unit that clamps both sides of the relay connection body and restricts the relay connection body from moving in a direction separating from the circuit board;
An electric wire connection structure for a board comprising:   The electric wire connection structure for a substrate according to claim 5, wherein a recess is provided in a peripheral portion of the circuit board, and the clamping unit is disposed in the recess.   The clamping unit includes a base member that is fixed to the circuit board and a cover member that is openably and closably attached to the base member, and the both sides of the relay connection body between the base member and the cover member. The electric wire connection structure for substrates according to claim 5 or 6, wherein the portion is clamped.   The base member has a locking portion, the cover member has a locked portion, and the locked portion engages with the locking portion, so that the cover member is locked to the base member. The electric wire connection structure for a substrate according to claim 7.

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