JP2006269212A - Connection structure of printed-circuit board and bus bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a printed-circuit board and a bus bar capable of reducing work man-hours to make it small in size and improved in connection reliability. <P>SOLUTION: A pair of arm parts 14, 14 which can widen by insertion of a printed-circuit board 10 are provided at the tip of a bus bar 11, and a pair of contact parts 15, 15 which contact each of the pair of arm parts 14, 14 by being clipped between the pair of arm parts 14, 14 are formed at both sides of the printed-circuit board 10. Thereby, since the contact parts 15 are clipped by the arm parts 14, the printed-circuit board 10 and the bus bar 11 are connected. As a result, a soldering process is not required and work man-hours can be reduced. With reduced number of components, small size is realized. Furthermore, since the electrical connection is made at two of both the surface side and the rear side of the printed-circuit board, connection reliability can be improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a connection structure between a printed circuit board and a bus bar.

2. Description of the Related Art Conventionally, as a connection structure between a printed circuit board and a bus bar in a vehicular electrical connection box that accommodates the printed circuit board and a bus bar, for example, a structure described in Patent Document 1 is known. In this case, a printed circuit board in which a conductive path is formed on at least one surface of an insulating substrate by printed wiring means and a bus bar formed by punching a metal plate material are connected by a relay terminal made of the metal plate material. It has become. This relay terminal is formed in a substantially U shape by bending a metal plate material, and both end portions thereof are tapered in the width direction, and connection portions for connecting to a printed circuit board and a bus bar, respectively. Is done. The printed board is formed with an insertion hole penetrating the conductive path and the insulating plate in the thickness direction of the printed board, and the bus bar is also formed with an insertion hole penetrating in the thickness direction. The conductive path and bus bar of the printed circuit board are soldered by inserting one connection portion of the relay terminal into the insertion hole on the printed circuit board side and soldering the other connection portion into the insertion hole on the bus bar side. As a result, they are electrically connected.
Japanese Patent Laying-Open No. 2005-6472 (FIG. 10)

  However, according to the above configuration, in order to connect the printed circuit board and the bus bar, a part that connects the conductive path of the printed circuit board and the connection part of the relay terminal, and a part that connects the connection part of the bus bar and the relay terminal, Therefore, there is a problem that the number of work steps increases and the connection work becomes complicated.

  Therefore, in order to omit the soldering process, for example, a card edge type terminal structure may be formed on the printed circuit board side, and a card edge connector may be provided on the bus bar side. However, according to this method, since a card edge connector is required, the number of parts is increased, and there is a problem in that the size cannot be sufficiently reduced. If the printed circuit board is displaced in the thickness direction due to vibration or the like, the contact between the conductive path of the printed circuit board and the contact portion of the card edge type connector becomes unstable, and the connection reliability between the printed circuit board and the bus bar is lowered. There is concern.

  The present invention has been completed based on the above-described circumstances, and can provide a connection structure between a printed circuit board and a bus bar that can be reduced in size by reducing the number of work steps and that has improved connection reliability. Objective.

  As means for achieving the above object, the invention of claim 1 is directed to a printed circuit board in which an electronic circuit is formed by printed wiring means on at least one surface of an insulating substrate, and the electronic circuit at an edge of the printed circuit board. Is a connection structure between a printed circuit board and a bus bar for connecting a bus bar that is electrically connected to the bus bar, and can be expanded by inserting an edge of the printed circuit board at a front end of the bus bar. A pair of arm portions are provided, and both sides of the printed circuit board are electrically connected to the electronic circuit, and are sandwiched between the pair of arm portions, whereby the pair of arm portions A pair of contact portions that come into contact with each of the above are formed.

  The invention according to claim 2 connects a printed circuit board in which an electronic circuit is formed on at least one surface of an insulating substrate by printed wiring means and a bus bar electrically connected to the electronic circuit at an edge of the printed circuit board. A connection structure between a printed circuit board and a bus bar, wherein a plurality of connection pieces bent to be opposed to each other are provided at the end of the bus bar, and the tips of the connection pieces Is provided with a pair of arms that can be expanded by inserting an edge of the printed circuit board, and at least one surface of the printed circuit board is electrically connected to the electronic circuit, A contact portion that contacts at least one of the pair of arm portions is formed by being sandwiched between the pair of arm portions.

  According to a third aspect of the present invention, in the second aspect of the present invention, the contact portion is formed on both surfaces of the printed circuit board so as to be in contact with each of the pair of arm portions.

  According to a fourth aspect of the present invention, in the printed circuit board and the pair of contact portions according to the first or third aspect, a through-hole penetrating the printed circuit board and the pair of contact portions is formed. The tip of the arm portion is fitted into the through hole with the pair of contact portions sandwiched therebetween.

  A fifth aspect of the invention is characterized in that, in the fourth aspect of the invention, a plating layer is formed on the inner periphery of the through hole.

<Invention of Claim 1>
According to the first aspect of the present invention, the printed circuit board and the bus bar are electrically connected by the contact portion formed on the printed circuit board being sandwiched between the arm portions formed at the front end of the bus bar. Thereby, since the soldering process for connecting the electronic circuit of the printed circuit board and the bus bar can be omitted, the manufacturing process can be simplified.

  Furthermore, since the printed circuit board and the bus bar are configured to be directly connected by sandwiching the contact portion with the arm portion provided at the front end of the bus bar, for example, a connection member such as a relay terminal or a card edge connector. Is no longer necessary. As a result, the connection structure between the printed circuit board and the bus bar can be reduced in size.

  In addition, the electronic circuit of the printed circuit board and the bus bar are electrically connected at two places, between the contact portion and the arm portion on the front surface side of the printed circuit board and between the contact portion and the arm portion on the back surface side. ing. Thereby, even when the printed circuit board is displaced in the thickness direction due to vibration or the like, the contact portion and the arm portion come into contact with each other on at least one of the front surface side or the back surface side of the printed circuit board. The connection reliability can be improved.

<Invention of Claim 2>
According to the invention of claim 2, the printed circuit board contact portion is sandwiched between the arm portions provided at the tips of the plurality of connection pieces provided on the bus bar, whereby the electronic circuit of the printed circuit board and the bus bar are connected. It is designed to be electrically connected. As a result, the electronic circuit of the printed circuit board and the bus bar are electrically connected at a plurality of locations between the contact portion and the plurality of arm units, so that the connection reliability between the printed circuit board and the bus bar is reliable. Can be improved.

<Invention of Claim 3>
According to the third aspect of the present invention, a pair of contact portions that come into contact with each of the pair of arm portions are provided on both surfaces of the printed circuit board. Thereby, the electronic circuit of the printed circuit board and the bus bar are electrically connected both between the contact portion and the arm portion on the front surface side of the printed circuit board and between the contact portion and the plurality of arm portions on the back surface side of the printed circuit board. It is like that. Thereby, the connection reliability of a printed circuit board and a bus bar can be improved.

<Invention of Claim 4>
According to invention of Claim 4, since the front-end | tip of an arm part fits in in a through-hole, even if it tries to displace a printed circuit board to the direction along the board surface by vibration etc., the front-end | tip of an arm part and By contacting the inner wall of the through hole, it is possible to regulate the displacement of the printed circuit board in the direction along the plate surface. As a result, the connection reliability between the printed circuit board and the bus bar can be improved.

<Invention of Claim 5>
According to invention of Claim 5, since the plating layer is formed in the through-hole formed in the printed circuit board, the tip of the arm part inserted in the through-hole comes into contact with the plating layer. Yes. Thereby, since electrical connection with an arm part and a contact part can be performed reliably, the connection reliability of a printed circuit board and a bus-bar can be improved.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a connection for electrically connecting the printed circuit board 10 and the bus bar 11 in a vehicular electrical connection box (not shown) that accommodates the printed circuit board 10 and a plurality of bus bars 11. Structure.

  The printed circuit board 10 has an electronic circuit formed on the surface of the insulating substrate 12 having a substantially rectangular shape (surface on the front side in FIG. 1) by printed wiring means. The electrical component 13 is mounted in an electrically connected state.

  The bus bar 11 is formed by punching a metal plate into a predetermined shape to form a predetermined power circuit (not shown in detail).

  Now, at the lower edge of the printed circuit board 10 in FIG. 1, a plurality of conductive patterns having a substantially rectangular shape are formed on the front surface and back surface (the back surface of FIG. 1) of the printed circuit board 10 in FIG. It is formed in the left-right direction at a predetermined interval, and is sandwiched between arm portions 14 to be described later to serve as contact portions 15 for contacting the arm portions 14 (see FIG. 2). Although not shown in detail, each contact portion 15 is electrically connected to an electronic circuit formed on the printed circuit board 10. The contact portion 15 formed on the front surface side of the printed circuit board 10 and the contact portion 15 formed on the back surface side form a pair, and are arranged substantially symmetrically with respect to the insulating substrate 12 as shown in FIG. Has been.

  A pair of arm portions 14, 14 that can be expanded and deformed are formed at the tip of the bus bar 11. The distal end of the arm portion 14 is bulged inward and serves as contact portions 16 and 16 that come into contact with the contact portion 15 of the printed circuit board 10. The distance between the contact portions 16 and 16 is substantially the same or slightly smaller than the sum of the thickness dimension of the insulating substrate 12 and the thickness dimension of the contact portion 15 formed on both the front and back surfaces of the insulating substrate 12. Is set. The arm portion 14 is elastically expanded and deformed when the end edge of the printed circuit board 10 is inserted between the pair of arm portions 14 and 14, and the end edge of the printed circuit board 10 is sandwiched by its elastic force. It has become.

  The plurality of bus bars 11 are arranged at predetermined intervals along the left-right direction in FIG. 1 with their tips opposed to each other and their plate surfaces directed in the left-right direction in FIG. The arm portion 14 of each bus bar 11 is arranged to extend upward in FIG. The pitch between the bus bars 11 is set to be approximately the same as the pitch between the contact portions 15 of the printed circuit board 10.

  Next, functions and effects of the first embodiment will be described. The printed circuit board 10 in FIG. 1 is inserted between a plurality of pairs of arms 14 from above in FIG. 1 with the plate surface facing in the direction penetrating the paper surface in FIG. Then, the lower edge of the printed circuit board 10 comes into contact with the contact portions 16 and 16 of the pair of arm portions 14 and 14 formed at the tip of each bus bar 11 from above, so that the pair of arm portions 14 and 14 is contacted. Expands and deforms. Subsequently, when the printed circuit board 10 is further pushed down, the contact part 15 of the printed circuit board 10 and the contact part 16 of the arm part 14 start to contact each other, whereby the printed circuit board 10 and the bus bar 11 are electrically connected. . In this state, the contact portion 15 on the front surface side (front side in FIG. 1) of the printed circuit board 10 and the arm portion 14 located on the front side in FIG. The contact portion 15 on the back surface side (back side in FIG. 1) of the printed circuit board 10 and the arm portion 14 located on the back side in FIG. 1 of the pair of arm portions 14 and 14 are in contact with each other. . When the printed circuit board 10 is further pushed down, the printed circuit board 10 reaches the normal position and is held at the normal position by a holding unit (not shown).

  According to the present embodiment, a pair of contact portions 15, 15 formed on the front surface and the back surface of the printed circuit board 10 with respect to one bus bar 11 are connected to the printed circuit board via the pair of arm portions 14, 14. Electrical connection is made at two locations on the front surface and the back surface of 10. As a result, even when the printed circuit board 10 is displaced in the thickness direction (left and right direction in FIG. 2) due to vibration or the like, the contact portion 15 on the front surface side or the back surface side of the printed circuit board 10 and the pair of arm portions 14, 14. Any one of the contact parts 16 and 16 is always in contact. Details are as follows. For example, when the printed circuit board 10 is displaced to the left in FIG. 2, the arm portion 14 located on the left side in FIG. 2 bends and deforms to the left. On the other hand, the arm portion 14 located on the right side in FIG. 2 is restored and displaced to return to the natural state. When the printed circuit board 10 is further displaced leftward, among the contact parts 15 of the printed circuit board 10, the contact part 15 formed on the right side in FIG. 2 and the contact part 16 of the arm part 14 positioned on the right side in FIG. Separate. However, even in this case, the contact part 15 formed on the left side in FIG. 2 and the contact part 16 of the arm part 14 located on the left side in FIG. The part 15 is in contact with the contact part 16 from the right side in FIG. Thereby, the contact part 15 located in the left side in FIG. 2 and the arm part 14 can be maintained in an electrically connected state.

  Similarly to the above, when the printed circuit board 10 is displaced to the right in FIG. 2, the contact portion 15 located on the right side in FIG. 2 and the arm portion 14 located on the right side are electrically connected. Can be maintained.

  Thus, according to this embodiment, even when the printed circuit board 10 is displaced in the thickness direction, the electrical connection between the printed circuit board 10 and the bus bar 11 can be maintained, so that the connection reliability can be improved.

  Further, according to the present embodiment, the printed circuit board 10 and the bus bar 11 are electrically connected to each other by the contact portion 15 formed on the printed circuit board 10 being sandwiched between the arm portions 14 and 14 formed at the front end of the bus bar 11. Connected. Thereby, since the soldering process for connecting the electronic circuit of the printed circuit board 10 and the bus bar 11 can be omitted, the manufacturing process can be simplified.

  Furthermore, according to this embodiment, the printed circuit board 10 and the bus bar 11 are configured to be directly connected by the arm portions 14 and 14 provided at the tip of the bus bar 11 sandwiching the contact portion 15. Therefore, connection members such as relay terminals and card edge connectors are not required. As a result, the connection structure between the printed circuit board 10 and the bus bar 11 can be reduced in size.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The difference from the first embodiment is that a pair of contact portions 15, 15 formed on both front and back surfaces of the printed circuit board 10 and a through hole 17 that penetrates the insulating substrate 12 are provided, and the inner periphery of the through hole 17 is provided. The plating layer 18 electrically connected to the contact portion 15 is formed, and other configurations are substantially the same as those of the first embodiment. The same parts as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The through hole 17 and the plating layer 18 can be formed as follows, for example. The through hole 17 can be formed in the insulating substrate 17 by using a drill, laser light, or the like. After the through hole 17 is formed, the plating layer 18 can be formed in the through hole 17 by electroless plating. The plating layer 18 may be formed only by electroless plating, or may be formed by performing electroplating after performing electroless plating.

  The through hole 17 formed in the printed circuit board 10 is arranged so that the contact portion 16 of the arm portion 14 is fitted into the through hole 17 in a state where the printed circuit board 10 is held at the normal position with respect to the bus bar 11. Yes.

  Thereby, even when the printed circuit board 10 is about to be displaced in a direction along the plate surface (vertical direction in FIG. 3) due to vibration or the like, the contact portion 16 of the arm portion 14 contacts the inner periphery of the through hole 17. Thus, the displacement of the printed circuit board 10 in the direction along the plate surface can be restricted. As a result, the connection reliability between the printed circuit board 10 and the bus bar 11 can be improved.

  Furthermore, since the contact portion 16 of the arm portion 14 comes into contact with the plating layer 18 formed on the inner periphery in the through hole 17, the electrical connection between the arm portion 14 and the contact portion 15 is ensured. It can be carried out. As a result, the connection reliability between the printed circuit board 10 and the bus bar 11 can be further improved.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. Two connection pieces 19, 19 having a substantially T-shape are extended at the tip of the bus bar 11. With the boundary between the connection piece portions 19 and 19 and the bus bar 11 as a fold line, both connection piece portions 19 and 19 are bent substantially at right angles toward the upper side of FIG. Thereby, each connection piece part 19 and 19 has mutually opposed state. A pair of arm portions 14 and 14 are formed at the tips of the connection piece portions 19 and 19, and the arm portions 14 are arranged to extend upward in FIG. 4.

  Further, a contact portion 15 is formed on the lower surface of the printed circuit board 10 in FIG.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  In a state where the printed circuit board 10 is held at the normal position with respect to the bus bar 11, the pair of arm portions 14 and 14 located on the left side in FIG. 5 sandwich the printed circuit board 10 from the vertical direction in FIG. The printed circuit board 10 is electrically connected to the lower surface in FIG. Further, the pair of arms 14 and 14 located on the right side in FIG. 5 also sandwich the printed circuit board 10 from the vertical direction in FIG. 5 and contact formed on the lower surface in FIG. The unit 15 is electrically connected.

  As described above, in this embodiment, one bus bar 11 and the pair of contact portions 15 and 15 are one in the left arm portion 14 and one in the right arm portion 14 in FIG. It comes to contact at the place. Thereby, the connection reliability of the printed circuit board 10 and the bus bar 11 can be improved.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, contact portions 15 and 15 are formed in pairs on both the upper and lower surfaces in FIG. 6 of the printed circuit board 10, and the pair of contact portions 15 and 15 are connected to the insulating substrate 12. Are formed approximately symmetrically.

  Since the configuration other than the above is substantially the same as that of the third embodiment, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  In a state where the printed circuit board 10 is held at a normal position with respect to the bus bar 11, the pair of arm portions 14 and 14 located on the left side in FIG. 6 sandwich the printed circuit board 10 from the vertical direction in FIG. Electrical connection is made at two locations on the front and back surfaces of the printed circuit board 10. Further, the pair of arms 14 and 14 located on the right side in FIG. 6 also sandwich the printed circuit board 10 from the vertical direction in FIG. 6 and are electrically connected at two locations on the front surface and the back surface of the printed circuit board 10. It has become.

  Thus, in this embodiment, one bus bar 11 and the pair of contact parts 15 and 15 are a total of four places, two on the left arm 14 and two on the right arm 14 in FIG. It comes to contact with. Thereby, the connection reliability of the printed circuit board 10 and the bus bar 11 can be improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the second embodiment, the plating layer 18 is formed on the inner periphery of the through-hole 17. However, the present invention is not limited to this. For example, the arm portion 14 extends from the arm portion 14 to the contact portion 15. If the arm portion 14 and the contact portion 15 are configured to be in reliable contact with each other, such as a protrusion for reliably contacting the plating layer 18, the plating layer 18 can be omitted.

  (2) In the second embodiment, the through hole 17 is formed in the printed circuit board 10 and the contact portion 15. However, the present invention is not limited to this. For example, a recess is provided in the contact portion 15, and an arm portion is provided in the recess. It is good also as a structure which the front-end | tip of 14 may be inserted, and what is necessary is just a structure which can control that the printed circuit board 10 displaces to the direction along the board surface by the front-end | tip of the arm part 14 contacting.

  (3) In the third and fourth embodiments, the two connection piece portions 19 and 19 are extended at the end of the bus bar 11, but the present invention is not limited to this, and the connection piece portions 19 are opposed to each other. If possible, three or more connection piece portions 19 may be formed.

  (4) The electronic circuit formed on the printed circuit board 10 may be formed only on one surface of the printed circuit board 10, or may be formed on both surfaces.

  (5) The pair of contact portions 15, 15 formed on both surfaces of the printed circuit board 10 has a substantially rectangular shape and is arranged substantially symmetrically with respect to the insulating substrate 12, but is not limited thereto. The pair of contact portions 15 and 15 are sandwiched between the pair of arm portions 14 and 14 in a state where the printed circuit board 10 is held at the normal position with respect to the bus bar 11, and contact the respective arm portions 14. If possible, it can take any shape and arrangement.

  (6) In the third embodiment, the connecting piece portions 19 and 19 are in the same direction with the connecting piece portions 19 and 19 formed in a substantially T shape at the end portion of the bus bar 11 as a folding line at the boundary with the bus bar 11. However, the present invention is not limited to this, and a configuration as shown in FIG. 7 may be used. That is, two connection piece portions 19 and 19 having a substantially T-shape are extended at the tip of the bus bar 11, and the length dimension of one connection piece portion 19A is the other connection piece portion. It is set longer than the length dimension of 19B. One connecting piece portion 19A is formed to be bent so as to face the plate surface of the bus bar 11 and the other connecting piece portion 19B, with the boundary between the bus bar 11 and the one connecting piece portion 19A being a folding line. Thereby, each connection piece part 19A, 19B is in the mutually opposing state. The length dimensions of both connection piece portions 19A and 19B are set so that the tip position of one connection piece portion 19A and the tip position of the other connection piece portion 19B are substantially aligned after being bent. Since the configuration other than the above is substantially the same as that of the third embodiment, the same portions are denoted by the same reference numerals, and redundant description is omitted.

The perspective view which shows the connection structure of the printed circuit board which concerns on Embodiment 1 of this invention, and a bus-bar. In Embodiment 1, the partially expanded side sectional view which shows the contact state of the contact part of a printed circuit board, and the arm part of a bus bar The partially expanded side sectional view which shows the contact state of the contact part of a printed circuit board, and the arm part of a bus bar in the connection structure of the printed circuit board which concerns on Embodiment 2 of this invention, and a bus bar The partially expanded perspective view which shows the connection piece part in the connection structure of the printed circuit board and bus bar which concern on Embodiment 3 of this invention. In Embodiment 3, the partially expanded plane sectional view which shows the contact state of the contact part of a printed circuit board, and the arm part of a bus bar The partially expanded plane sectional view which shows the contact state of the contact part of a printed circuit board, and the arm part of a bus bar in the connection structure of the printed circuit board and bus bar which concern on Embodiment 4 of this invention. The partially expanded perspective view which shows the connection piece part in the connection structure of the printed circuit board and bus bar which concern on other embodiment (6).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printed circuit board 11 ... Bus bar 12 ... Insulating board 14 ... Arm part 15 ... Contact part 17 ... Through-hole 18 ... Plating layer 19 ... Connection piece part

Claims (5)

A connection structure between a printed circuit board in which an electronic circuit is formed on at least one surface of an insulating substrate by printed wiring means and a bus bar electrically connected to the electronic circuit at an edge of the printed circuit board,
At the tip of the bus bar, a pair of arms that can be expanded by inserting an edge of the printed circuit board is provided,
On both sides of the printed circuit board, there is a pair of contact portions that are electrically connected to the electronic circuit and are sandwiched between the pair of arm portions so as to come into contact with each of the pair of arm portions. A connection structure between a printed circuit board and a bus bar, which is formed. A connection structure between a printed circuit board in which an electronic circuit is formed on at least one surface of an insulating substrate by printed wiring means and a bus bar electrically connected to the electronic circuit at an edge of the printed circuit board,
A plurality of connection pieces bent so as to face each other are provided at the end of the bus bar, and the edges of the printed circuit board are inserted at the ends of the connection pieces to expand the connection. A pair of possible arms are provided,
At least one surface of the printed circuit board is electrically connected to the electronic circuit and is sandwiched between the pair of arm portions so as to contact at least one of the pair of arm portions. A connection structure between a printed circuit board and a bus bar, characterized in that is formed. 3. The connection structure between a printed circuit board and a bus bar according to claim 2, wherein the contact part is formed on both surfaces of the printed circuit board so as to contact each of the pair of arm parts. In the printed circuit board and the pair of contact portions, a through hole penetrating the printed circuit board and the pair of contact portions is formed,
4. The connection structure between a printed circuit board and a bus bar according to claim 1, wherein a distal end of the arm portion is fitted into the through hole in a state where the pair of contact portions are sandwiched. 5. The connection structure between a printed circuit board and a bus bar according to claim 4, wherein a plating layer is formed on an inner periphery of the through hole.

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