JP2006164580A - Electric connector with cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric connector with a cable adapted to an ultrafine cable and narrow pitch connection by a simple method. <P>SOLUTION: This electric connector with the cable has a plurality of wire connection pads 3A, 3B arranged on the surface of a circuit board 1 at prescribed intervals having a plurality of connection pads 5D, 4C conducted to the wire connection pads and arranged. Core wires 2D of the cable 2 are connected with the plurality of wire connection pads, respectively, and the circuit board is engaged with a mating connector with the connection pads to be electrically connected. The core wires 2D of the cable 2 are connected with the corresponding wire connection pads 3A, 3B through an anisotropic conductive material 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical connector with a cable.

  As an electrical connector with a cable, terminals are arranged in a housing that fits with a mating connector, and a core wire of a cable is soldered to a connection portion on one end side of the terminal. In general, the end-side connecting portion is in contact with the terminal of the mating connector for electrical connection. On the other hand, the object to which the cable is connected is not the terminal but the connection pad of the circuit board. The circuit board is provided with a connection part that conducts to this connection pad, and the circuit board is fitted to the mating connector at this connection part. Some are designed to do this.

  Patent Document 1 discloses a connector using a circuit board, and an ultrafine coaxial cable is connected to the circuit board.

  In order to connect the core wire exposed from the end of the coaxial cable to the connection pad (pattern) of the circuit board, solder is usually used. In recent years, electronic devices have been required to be further reduced in size and weight, and accordingly, the coaxial line itself has been made thinner and the interval (pitch) between coaxial cables has been reduced. When a thin coaxial cable is connected with solder as in the past, particularly in a narrow pitch structure with a pitch of about 0.4 mm or less, there is a case where adjacent terminals are bridged to cause a short circuit.

Therefore, in Patent Document 1, in order to avoid the problem due to the short circuit, the peeled center conductor of the thin coaxial cable is placed on the pad, and these pads and the center conductor are covered with the laser beam. A method of cutting the pad between the central conductors by irradiating the laser beam again after connecting the pad and the center conductor by irradiating the jig with a laser beam and aligning and holding the jig. Is disclosed.
JP 2004-63373 A

  However, in the method disclosed in Patent Document 1, a special jig that transmits laser light is required, and the laser must be irradiated twice for melting the solder and cutting the pad. There is also a problem that a different jig is required each time the outer diameter of the central coaxial or the number of coaxial cables changes.

  An object of the present invention is to provide an electrical connector with a cable that can be easily connected even with a very fine cable and a narrow pitch connection, without using such a cumbersome technique.

  An electrical connector with a cable according to the present invention has a plurality of connection pads arranged at predetermined intervals on a surface of a circuit board, and a plurality of connection pads arranged to be electrically connected to the connection pads, respectively. Corresponding to each of the connection pads, the core wire of the cable is connected, and the circuit board is fitted and electrically connected to the mating connector at the connection pad.

  In such an electrical connector with a cable, the present invention is characterized in that the core wire of the cable is joined and connected to the connection pad corresponding to the cable via an anisotropic conductive material.

  In the present invention having such a configuration, the core wire of the cable is disposed on the connection pad of the circuit board via the anisotropic conductive material, and the core wire is pressed in a high temperature atmosphere to be bonded to the corresponding connection pad. Connected.

  Anisotropic conductive materials are widely used in electronic devices as bonding materials for the purpose of connection. For example, an anisotropic conductive film (ACF) is widely known as a kind of anisotropic conductive material. This anisotropic conductive film generally comprises an epoxy resin as a main ingredient, and conductive particles, a curing agent and an additive are dispersed in the main ingredient. At the time of use, the anisotropic conductive film is arranged between two connection target parts, between the connection pad and the core wire in the above example, and is sandwiched between the two parts while being heated in a high temperature atmosphere. In the sandwiched portion, the conductive particles in the film come into close contact with each other, and the core wire and the connection pad are electrically connected through the close contact conductive particles. As the anisotropic material, an anisotropic conductive paste (ACP: Anisotropic Conductive Paste) can be used in addition to the anisotropic conductive film.

  Since the connection is made through such an anisotropic conductive material, it is suitable for the case where the core wires are arranged at a narrow pitch without causing a short circuit between the core wires due to the bridge, as in the case of solder connection. In addition, the wiring work is simplified by simply clamping in a high temperature atmosphere.

  In the present invention, it is preferable that every other plurality of connection pads are electrically connected to a circuit portion formed on the other surface of the circuit board, and the circuit portions are electrically connected to corresponding connection pads. In this way, the connection pads can be arranged at an interval twice the pitch interval of the connection pad arrangement. For example, the circuit board is fitted and connected to a mating connector having a terminal at the connection pad portion. When this is done, the terminals can be arranged at twice the spacing described above, making it easier to manufacture the mating connector. In this case, the other connection pad adjacent to the one connection pad in the arrangement direction can be provided at the same position in the arrangement direction on the other surface of the circuit board. Alternatively, the circuit board may be provided at the same position in the arrangement direction on one surface and the other surface of the circuit board.

  In the present invention, when the plurality of cables are coaxial cables, it is desirable that their shield wires are connected to a common ground bar or ground pad. The ground bar or the like reinforces the periphery of the cable connection portion.

  In the present invention, the circuit board extends in the arrangement direction of the plurality of cables and has a window portion longer than the arrangement range, and the comb-like jig for positioning the cable is connected to the window from the side opposite to the surface on the cable arrangement side. It can be made to be able to be inserted into the part so as to be freely extracted. If this jig is inserted into the window and a cable is arranged between the comb teeth of the jig, the core wire is automatically positioned accurately on the connection pad. After connecting the core wire with the anisotropic conductive material, the jig is pulled out and repeatedly used for connecting other cables.

  In the present invention, the circuit board may have a reinforcing member attached to the surface of the circuit board opposite to the cable arrangement side corresponding to the portion where the cable is connected to the connection pad. If this reinforcing member is used, the periphery of the connection portion can be reinforced even if the circuit board is thin.

  When the reinforcing member is used, the reinforcing member is formed with a window portion corresponding to the window portion of the circuit board, so that the jig can be used regardless of the presence of the reinforcing member.

  The present invention has a plurality of terminals arranged at a predetermined interval in a housing without using the above-described circuit board, and a cable core wire is connected to a connection portion formed on one end side of the terminals. The present invention can also be applied to the case where the connecting portion on the other end side of the terminal contacts and is connected to the terminal of the mating connector when fitted to the mating connector. Even in this case, the core wire of the cable is joined and connected to the above-described connection portion through the anisotropic conductive material.

  In the case of a connector having such a terminal, the plurality of terminals are arranged in parallel at two positions spaced apart in the longitudinal direction of the cable, and the connection portion in one row and the connection portion in the other row are mutually connected in the arrangement direction. A distance corresponding to one pitch of the array is shifted, and the cable connected to the connection portion of the other row extends and is positioned between the connection portions of the one row. By doing so, the terminals arranged in two rows can be arranged in each row at an interval twice the arrangement pitch interval of the cables, facilitating the arrangement of the terminals on the connector.

  As described above, according to the present invention, since the cable core wire is joined to the connection object using the anisotropic conductive material, the connection can be easily performed. When joining using this anisotropic conductive material, since the pressing force at the connection part, that is, the position of the core wire is larger than the other positions, the bonding is surely performed, and if the pressing force acts between the core wires, Also, conduction between the core wires can be prevented more reliably. Since such an anisotropic conductive material is used for joining and solder is not used, the effect is particularly great in the case of an extra fine cable and a narrow pitch arrangement. That is, since the cable core wire is bonded to the connection pad via the anisotropic conductive material, it can be electrically connected to the connection target while avoiding electrical contact with the adjacent core wire.

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

<First embodiment>
In the connector with a cable shown in FIG. 1, a plurality of cables, in the case of the present embodiment, a coaxial cable 2 is connected to a circuit board 1 that functions as a connector connected to a mating connector. The circuit board 1 is shown in FIG. 2 as an enlarged fragmentary view of the edge on the mating connector side and its periphery.

  Two types of connection pads 3A and 3B extending in the longitudinal direction of the cables are arranged alternately on the upper surface of the circuit board 1 at the same interval as the arrangement pitch of the plurality of cables 2. In this case, the connection pads 3A and 3B are arranged adjacent to each other to form a set.

  One connection pad 3A includes a transmission path 4A as a circuit portion that extends linearly as it is on the upper surface of the circuit board on which the connection pad 3A is formed, and an annular flange portion that is formed circularly on the upper surface in the vicinity of the edge of the circuit board. Through 5A, it is electrically connected to the connection pad 5D connected to the flange portion 5B on the lower surface by a cylindrical conductive portion (through hole) 5C shown in FIG. The connection pad 3A on the upper surface, the transmission line 4A, and the connection pad 5D on the lower surface are formed as one continuous pattern. On the other hand, the other connection pad 3 </ b> B is electrically connected to a linear transmission line 4 </ b> B formed on the lower surface of the circuit board 1 through a conduction part (through hole) 6 that penetrates the circuit board 1. The transmission path 4B is formed on the lower surface of the circuit board at a position corresponding to the transmission path 4A on the upper surface of the circuit board, that is, at the same position in the arrangement direction. The transmission line 4B extends to the vicinity of the connection pad 5D on the lower surface, and forms a connection pad 4C at an end facing the connection pad 5D with a gap δ.

  In this way, the two connection pads 3A and 3B adjacent on the upper surface of the circuit board 1 are electrically connected to the connection pads 5D and 4C through the upper and lower transmission paths 4A and 4B at the same position in the arrangement direction on the lower surface. Therefore, the connection pads are arranged at twice the pitch interval with respect to the arrangement pitch interval in the connection pads. The flange portions 5A and 5B are connected to narrow path portions 7A and 7B extending to the edge of the circuit board 1.

  The circuit board 1 has a window portion 8 extending in a direction perpendicular to the longitudinal direction of the cable adjacent to the connection pads 3A and 3B on the side opposite to the transmission lines 4A and 4B with respect to the connection pads 3A and 3B. Is formed. The window 8 is formed beyond the arrangement range of the plurality of cables 2. A conductive ground pad 9 is provided on the upper surface of the circuit board 1 in a region between the window portion 8 and the left edge. The ground pad 9 continuously extends in substantially the same range as the window portion 8 in the arrangement direction of the cables 2.

  On the lower surface of the circuit board 1, a reinforcing member 10 made of an insulating material that covers the range of the ground pad 9, the window 8, and the connection pads 3A and 3B in the longitudinal direction of the cable 2 is attached by an appropriate method. . The reinforcing member 10 has a plate shape and reinforces the circuit board 1 from the lower surface. In the reinforcing member 10, a window portion communicating with the window portion 8 of the circuit board 1 is formed so as to penetrate vertically.

  With respect to such a circuit board 1, the core wires of the plurality of cables 2 are connected to the connection pads 3A and 3B. In this embodiment, the cable is a coaxial cable, and the end side is sequentially peeled off from the outer skin 2A, and the shield wire 2B, the dielectric 2C, and the center conductor 2D as the core wire are exposed. The central conductors 2D of the plurality of cables 2 are connected in order as the connection pads 3A and 3B and the next connection pads 3A and 3B. This connection is made through an anisotropic conductive film 11 which will be described later again. The central conductor 2D joined and connected to the connection pads 3A and 3B by the anisotropic conductive film 11 is covered with an insulating film 12.

  The shield wire 2B of each cable 2 is connected to the ground pad 9 by solder, conductive adhesive or the like.

  The connector of this embodiment formed in this way is made and used in the following manner.

  (1) First, the circuit board 1 with the reinforcing member 10 described in FIG. 1 is prepared (see FIG. 3), and the anisotropic conductive film 11 is covered so as to cover all the connection pads 3A and 3B of the circuit board 1. (See FIG. 6A).

  (2) In parallel with this, a jig 20 as shown in FIG. 4 is prepared. The jig 20 includes a comb-like array body 21 that forms a jig body and a support plate 22 that supports the array body 21. The array body 21 is arranged so as to penetrate from below to the window portion of the reinforcing member 10 and the window portion 8 of the circuit board 1 and protrude upward. In the array 21, a groove 21 </ b> A is formed on the upper surface of the portion protruding from the window portion 8 in the circuit board 1 to accommodate the dielectric 2 </ b> C portion of the cable 2 at the pitch of the cable 2. The reinforcing member 10 is disposed on the jig 20 so as to contact the surface (see FIG. 6B). As shown in FIG. 5, the cable 2 is inserted into the groove 21A protruding from the window 8 of the circuit board 1. The portion of the dielectric 2C is accommodated.

  (3) When the dielectric 2C of the cable 2 is arranged in the groove 21A, the exposed central conductor 2D of the plurality of cables 2 corresponds to the corresponding connection pad via the anisotropic conductive film of the circuit board 1 as shown in FIG. It comes to be located alternately on 3A and 3B.

  (4) Next, the insulating film 12 is disposed so as to completely cover all the central conductors 2D on the connection pads 3A, 3B (in order to clearly show the central conductor 2D in FIG. 6B). In addition, on the right end side of the central conductor 2D, the anisotropic conductive film 11 and the insulating film 12 are partially omitted. After the insulating film 12 is disposed, the film is pressed from above in a high temperature atmosphere. This pressurization is preferably performed via an elastic member. This is because even if the film is deformed along the central conductor during pressurization, the elastic member follows the deformation and enables pressurization over the entire region. By this pressurization, the portion of the center conductor 2D is pressed more strongly than the other portions. Here, the center conductor 2D is joined to the corresponding connection pads 3A and 3B via the anisotropic conductive film 11 (see FIG. 7). ). Further, the shield wire 2 </ b> B of each cable 2 is soldered to a common ground pad 9.

  (5) The connector with cable thus obtained is removed from the jig 20.

  (6) The connector with cable is connected to the terminal of the mating connector (not shown) on the other side of the circuit board 1. The contact portions of the terminals of the mating connector are elastically contacted with the connection pads 5D and 4C from the direction perpendicular to the substrate surface to be electrically connected to each other.

  In this embodiment, the two types of connection pads 5D and 4C are provided on the lower surface of the circuit board in a state where the cylindrical conductive portion 5C is not provided. You can also In this case, the corresponding terminal of the mating connector can be slidably contacted from the edge of the circuit board to reach the connection pads 5D and 4C, respectively. In such a case, the narrow path portions 7A and 7B are the introduction paths for the slidable contact. Will function as.

<Second embodiment>
Next, a second embodiment of the present invention will be described. This embodiment is different from the first embodiment in which the cable is connected to the circuit board in that the cable is connected to the terminal held by the housing.

  In FIG. 8, the connector 30 has a terminal 32 held by a housing 31 having a recess 31A that opens downward. The housing contains terminals 32 in slit-shaped grooves 31B that open to the left and right outer surfaces in the drawing and are parallel to the paper surface. A plurality of terminals 32 are arranged at predetermined pitch intervals in a direction perpendicular to the paper surface. The terminal 32 has a contact portion 32 </ b> A formed on the free end side of a portion bent in an S shape so as to have elasticity, and a connection portion 32 </ b> B that is bent and extends to the upper surface of the housing 31. As shown in FIGS. 8A and 8B, the left and right terminals 32 are arranged such that the connecting portions 32B are shifted by one pitch in the direction perpendicular to the paper surface. Therefore, the left and right terminals 32 have their connection portions 32B alternately positioned within the same range in the left-right direction.

  On the other hand, in the mating connector 40, the terminal 42 is held in the housing 41 in which the recess 41A for receiving the housing 31 of the connector 30 is formed. The terminal 42 is accommodated in a slit-shaped groove 41B that opens upward in the housing 41 and is parallel to the paper surface. The terminal 42 is formed on the free end side of the portion bent in an S shape so as to have elasticity. 42A and a connecting portion 42B extending outside the housing 41 on the other end side and at the same level as the bottom surface of the housing 41. The terminal 42 is in a position corresponding to the terminal 32 of the connector 30.

  Such connectors 30 and 40 are well known per se and will not be described in further detail. In the present embodiment, there is no restriction on the form of the connector or the form of the terminal, and it is sufficient if the connection portions of the terminals are arranged on one surface.

  A plurality of cables 2 are connected to the connector 30. In the connector 30, as shown in FIG. 9 as viewed from above, the connection portions 32 </ b> B of the left and right terminals 32 are alternately positioned. FIGS. 8A and 8B show the AA cross section and the BB cross section in FIG. 9, respectively. Referring to FIGS. 9 and 8, these connecting portions 32B are alternately positioned. I can understand that. Each of these connection portions 32B is located at the bottom of the opposite groove portion of the housing, and the central conductor 2D of each cable is brought into this groove portion so as to be located on the connection portion 32B. The central conductor 2D and the connection portion 32B are joined and connected by an anisotropic conductive film in the same manner as in the first embodiment.

  In the present embodiment, the plurality of cables 2 have their shield wires 2 </ b> B held together from above and below by a common plate-like ground bar 33 and connected. Further, the shield wire 2B can be collectively connected to the ground bar 33 via solder or a conductive adhesive.

  The shield 30 is attached to the connector 30 to which the cable 2 is thus connected as shown in FIGS.

  In use, after the connector 40 is arranged on a circuit board (not shown), the connection part 42B of the terminal 42 is soldered to the corresponding circuit part of the circuit board. The connector 30 is fitted and connected to the connector 40, and the cable 2 is electrically connected to the corresponding circuit portion of the circuit board.

It is a perspective view which shows the principal part of the connector with a cable of 1st embodiment of this invention. FIG. 2 is an enlarged perspective view showing a partially broken circuit board of the connector of FIG. 1. It is a perspective view which shows the circuit board before the connection of the connector of FIG. It is a perspective view of the jig | tool used in the case of the connection of the connector of FIG. It is a perspective view in the middle of the connection process of the connector of FIG. It is an expanded sectional view in the longitudinal direction of the cable which shows the connection part of the connector of FIG. 1, (A) shows before connection and (B) shows after connection. It is an expanded sectional view in the plane perpendicular to the longitudinal direction of the cable which shows the connection part of the connector of Drawing 1, and is a VII-VII sectional view in Drawing 1. It is sectional drawing which shows 2nd embodiment of this invention in the state before fitting with a mating connector, (A) is a cross section in one terminal, (B) is a cross section in the terminal which adjoins. It is a top view of the connector with a cable of FIG. 8, and the AA cross section in the figure respond | corresponds to FIG. 8 (A), and a BB cross section respond | corresponds to FIG. 8 (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit board 10 Reinforcement member 2 Cable 11 Anisotropic conductive material (film)
2D core wire (center conductor) 20 Jig
3A connection pad 31 housing 3B connection pad 32 terminal 4C connection pad 32A connection part 5D connection pad 32B connection part 8 window part 40 mating connector 9 ground pad

Claims (9)

  A plurality of connection pads arranged on the surface of the circuit board at a predetermined interval, and a plurality of connection pads arranged to be electrically connected to each connection pad, and corresponding to each of the plurality of connection pads, In an electrical connector with a cable in which a core wire is connected, and the circuit board is electrically connected to the mating connector by the connection pad, the core wire of the cable is associated with an anisotropic conductive material. An electrical connector with a cable, characterized in that it is joined with a connection pad.   The electrical connection with a cable according to claim 1, wherein every other plurality of connection pads are electrically connected to a circuit part formed on the other surface of the circuit board, and are electrically connected to a connection pad corresponding to the circuit part. connector.   3. The electric wire with cable according to claim 2, wherein another connection pad adjacent to one connection pad in the arrangement direction is provided at the same position in the arrangement direction on the other surface of the circuit board. connector.   The electrical connector with a cable according to claim 1, wherein the plurality of cables are coaxial cables, and their shield wires are connected to a common ground bar or ground pad.   The circuit board is formed with a window portion extending in the arrangement direction of the plurality of cables and longer than the arrangement range. The comb-shaped jig for positioning the cable is pulled out from the side opposite to the surface on the cable arrangement side to the window portion. The electrical connector with a cable according to claim 1, wherein the electrical connector can be inserted into the electrical connector.   6. The circuit board according to claim 1, wherein a reinforcing member is attached to a surface of the circuit board opposite to the cable arrangement side corresponding to a portion where the cable is connected to the connection pad. Electrical connector with cable as described in one of them.   The electrical connector with cable according to claim 6, wherein the reinforcing member has a window portion corresponding to the window portion of the circuit board.   The housing has a plurality of terminals arranged at a predetermined interval, and the cable core wire is connected to a connection portion formed on one end side of the terminals, and the other end of the terminal when the housing is fitted to the mating connector. In the electrical connector with a cable in which the connection portion on the side is connected in contact with the terminal of the mating connector, the core wire of the cable is joined and connected to the above-described connection portion through an anisotropic conductive material Electrical connector with cable.   The plurality of terminals are arranged in parallel at two positions separated in the longitudinal direction of the cable, and the connection portion of one row and the connection portion of the other row are distances corresponding to one pitch of the cable arrangement in the arrangement direction. The cable-attached electrical connector according to claim 8, wherein a cable connected to the connection portion of the other row is extended and positioned between the connection portions of the one row.

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