JP5811884B2 - PCB terminal fittings - Google Patents

Description

  The present invention relates to a terminal fitting for a substrate.

  Patent Document 1 discloses a terminal fitting for a board for connecting a conductor of an electrical component to a printed board. This terminal fitting for a board has a leg-like board connecting part that is inserted into a through hole of the printed board and connected to a circuit of the printed board, and a conductor connecting part for connecting a conductor.

JP 2011-070787 A

In the above-described terminal fitting for a board, the board connection part inserted into the through hole is fixed to the printed board by soldering, but there are only two board connection parts. Therefore, in the state before the board connecting portion is inserted into the through hole and soldering, the posture of the terminal fitting for the board is set to a line connecting the fitting portion between the two board connecting portions and the through hole as a substantial fulcrum. Concerned about tilting. Therefore, a jig is required to keep the terminal fitting for the board in the correct posture.
The present invention has been completed based on the above circumstances, and an object of the present invention is to make it possible to attach a terminal fitting for a board in a self-standing manner to a printed board.

As means for achieving the above object, the invention of claim 1 is intended to connect the conductors of the circuit components in the circuit of the printed circuit board, a conductor forming a flat for connecting said conductor a connecting portion, the lead to the right and left ends of the base end edge portion of the conductor connecting portion, a pair of right and left connecting legs which are connected before Symbol circuit are inserted into through holes for connection of the printed circuit board, the conductor leads to flush with the left-right direction central portion of the base end edge portion of the connecting portion, e Bei the one holding leg portion which is press-fitted in the holding through hole in said printed circuit board, before Symbol printed circuit board The terminal fitting for a board in which the three leg portions are arranged so as to form a triangular apex, and the conductor is provided at the distal end portion of the conductor connecting portion opposite to the base edge portion. The fitting part that fits and solders The right and left side edges of the conductor connection part are configured as a means for preventing heat transfer from the fitting part to the pair of connecting legs, and the fitting part and the base edge part. It is characterized in that a pair of left and right cutouts in a form in which a region between the two is partially cutout is formed .

According to a second aspect of the present invention, in the first aspect , the conductor connecting portion is connected to the conductor by soldering, and the connecting leg portion has a bent shape. It has a characteristic where it exists.

A third aspect of the invention is characterized in that, in the second aspect of the invention, the holding leg portion has a linear shape substantially perpendicular to the printed circuit board.

According to a fourth aspect of the present invention, there is provided the method according to any one of the first to third aspects, wherein the leg portion is engaged with an opening edge portion of the through hole in a state where the leg portion is inserted into the through hole. It is characterized in that a positioning projection for stopping is formed.

<Invention of Claim 1>
Since the three leg portions are inserted in such an arrangement as to form the apex of the triangle with respect to the three through holes, the board terminal fitting can be stably made to stand on the printed board.

Further, since the holding leg is press-fitted into the holding through-hole, the board terminal fitting is attached to the printed board in a more stable state.
Also, when soldering the conductor to the fitting part of the conductor connection part, the heat of the fitting part is transmitted to the circuit of the printed circuit board via the conductor connection part and the connecting leg part, and the circuit is adversely affected. Is concerned. In view of this point, in the present invention, a notch is formed in the middle of the heat transfer path from the fitting part of the conductor connection part to the connecting leg, and the cross-sectional area of the heat transfer path is set in a region corresponding to the notch. I made it smaller. Thereby, since it becomes difficult to transmit the heat of a fitting part to the leg part for a connection, the heat transfer from a conductor connection part to a circuit can be suppressed.

<Invention of Claim 2 >
When the conductor is soldered to the conductor connection portion, there is a concern that the heat of the conductor connection portion may be transmitted to the circuit of the printed circuit board via the connection leg portion and adversely affect the circuit. In view of this point, in the present invention, the length of the connecting leg is made longer by making the connecting leg bent. Thereby, since the length of the heat transfer path in the connecting leg portion is increased, heat transfer from the conductor connecting portion to the circuit can be suppressed.

<Invention of Claim 3 >
In order to increase the effect of suppressing the heat transfer from the conductor connection portion to the circuit, it is only necessary to lengthen the connection leg portion. To that end, a large area occupied by the connection leg portion on the printed board is ensured. There is a need. On the other hand, reducing the area occupied by the three legs on the printed circuit board has technical significance in reducing the size of the printed circuit board.

  In view of this point, in the present invention, among the three leg portions, the holding leg portions that do not contribute to the suppression of heat transfer from the conductor connection portion to the circuit are formed in a straight line that is substantially perpendicular to the printed circuit board. This makes it possible to lengthen the connecting leg without increasing the area occupied by the three legs on the printed circuit board, thereby suppressing the heat transfer from the conductor connecting part to the circuit and the printed circuit board. Both downsizing can be achieved.

<Invention of Claim 4>
When the leg portion is inserted into the through hole, the positioning protrusion is locked to the opening edge of the through hole, so that the insertion depth of the leg portion with respect to the through hole is defined. Positioned.

The perspective view of the terminal metal fitting for substrates of Embodiment 1 Front view of PCB terminal bracket Side view of PCB terminal bracket Plan view of terminal bracket for PCB Sectional view showing the state before attaching the terminal fittings to the printed circuit board through holes Sectional view showing the state where the legs of the terminal fitting for the board are inserted into the through hole of the printed circuit board and fixed by soldering The perspective view showing the state before attaching the terminal fitting to the printed circuit board A perspective view showing a state in which legs of a terminal fitting for a board are inserted into a through hole of a printed board A perspective view of a board unit configured by connecting an electric wire to a printed board via a terminal fitting for the board The perspective view showing the state where the board unit of the state where the electric wire was connected to the printed circuit board was resin-molded

<Embodiment 1>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in the drawing, the board terminal fitting 10 of the present embodiment is for connecting an electric wire W (a circuit constituent member which is a constituent element of the present invention) to a circuit C of a printed board P in a conductive manner. About the direction in the following description, for convenience, the printed circuit board P is arrange | positioned horizontally, and the state which attached the terminal metal fitting 10 for substrates to the printed circuit board P from upper direction is made into a reference | standard.

  As shown in FIG. 7, a circuit C having a predetermined pattern is printed on the front surface (upper surface) and the back surface (lower surface) of the printed circuit board P. Further, the printed circuit board P has a plurality of through holes for holding Ha that are not electrically connected to the circuit C, and a plurality of pairs of through holes Hb that are connected to the circuit C on the inner peripheral surface. , Penetrated. The number of connection through holes Hb and the number of holding through holes Ha are the same. Also, as shown in FIGS. 7 and 8, a plurality of types of electronic components E are mounted on the surface of the printed circuit board P.

  As shown in FIGS. 7 and 8, a plurality of types of board terminal fittings 10 having different dimensions are attached to the printed circuit board P in accordance with the wiring height and wiring path of the electric wire W with respect to the printed circuit board P. Since the basic form of the plurality of types of board terminal fittings 10 is the same, the form of the typical board terminal fitting 10 will be described.

  As shown in FIGS. 1 to 4, the terminal fitting 10 for a substrate is formed by bending a metal plate material punched into a predetermined shape. The board terminal fitting 10 is configured by integrally forming a conductor connecting portion 11, one holding leg portion 13a, and two connecting leg portions 13b. The conductor connecting portion 11 has a substantially rectangular flat plate shape that is substantially perpendicular to the printed circuit board P as a whole. The conductor connection portion 11 is formed with a fitting portion 12 having a shape in which an upper end edge (tip end portion) is cut out in a substantially U shape. As shown in FIGS. 6 and 9, the conductor Wa from which the insulation coating is removed from the electric wire W is fitted into the fitting portion 12 from above. The conductor Wa fitted in the fitting portion 12 is fixed (connected) to the conductor connecting portion 11 so as to be conductive by soldering.

  As shown in FIG. 6, the holding leg portion 13 a has a linear shape substantially perpendicular to the printed circuit board P, and the upper end portion (base end portion) of the holding leg portion 13 a is the base end edge portion of the conductor connecting portion 11. 14 (bottom edge) is connected in a flush manner. In the left-right direction (the length direction of the base end edge 14), the holding leg 13 a is disposed at the center of the base end edge 14. The lower end portion of the holding leg 13a is inserted into the holding through hole Ha in a press-fitted state, that is, in a state where the printed board P is not rattled and cannot be easily removed. A pair of left and right positioning projections 15a is formed on the holding leg 13a. As shown in FIG. 6, when the holding leg portion 13a is inserted into the holding through hole Ha, the positioning protrusion 15a is locked to the opening edge of the holding through hole Ha on the upper surface of the printed board P, whereby the printed board P The height (insertion depth) of the holding leg 13a is defined. Thereby, the conductor connection part 11 connected to the upper end part of the holding leg part 13a in a flush manner is positioned in the height direction with reference to the surface of the printed circuit board P.

  As shown in FIGS. 2 and 4, the pair of connecting legs 13 b have a symmetrical shape and are connected to both left and right ends of the base end edge portion 14 of the conductor connecting portion 11. The connection leg portion 13b is bent in a substantially L shape when viewed from the side, and is composed of an extension portion 16 that is substantially parallel to the printed circuit board P and an insertion portion 17 that is substantially perpendicular to the printed circuit board P. . The front end portion of the extension portion 16 is connected to the base end edge portion 14 of the conductor connection portion 11 at a substantially right angle. The upper end portion of the insertion portion 17 is connected to the rear end portion of the extension portion 16 at a substantially right angle. That is, the connecting leg portion 13 b has a shape that protrudes rearward from the conductor connecting portion 11. The pair of connecting legs 13b are symmetrical, and one holding leg 13a is located in the center of the paired connecting legs 13b in the left-right direction. , 13b have a positional relationship (arrangement) that constitutes the vertices of an isosceles triangle.

  The lower end portion of the insertion portion 17 is inserted with a gap from the connection through hole Hb. Each insertion portion 17 is formed with a pair of left and right positioning projections 15b. When the connecting leg 13b is inserted into the connecting through hole Hb, the positioning projection 15b is locked to the opening edge of the connecting through hole Hb on the upper surface of the printed board P, so that the connecting leg 13b of the printed board P is connected. The height (insertion depth) is specified. Accordingly, the connecting leg 13b is positioned in the height direction with respect to the surface of the printed circuit board P.

  When the conductor Wa is soldered to the fitting portion 12 at the upper end portion of the conductor connecting portion 11, the conductor connecting portion 11 constitutes a heat transfer path for transferring the heat of the fitting portion 12 toward the base end edge portion 14. . The base end edge portion 14 is connected to a connecting leg portion 13b. Since the connecting leg portion 13b is connected to the circuit C of the printed circuit board P, the heat of the fitting portion 12 passes through the connecting leg portion 13b. Therefore, there is a concern that the circuit C is damaged by heat.

  In the present embodiment, as a heat transfer measure from the fitting portion 12 to the circuit C, a pair of left and right symmetrical notches 18 are formed at the left and right side edges of the conductor connection portion 11. As shown in FIGS. 1 to 3, the notch 18 has a fitting part 12 and a base edge part in the vertical direction (that is, a direction parallel to the heat transfer path from the fitting part 12 toward the base edge part 14). 14. A region between the pair of cutout portions 18 in the conductor connection portion 11 (heat transfer path), that is, a region corresponding to the cutout portion 18 in the heat transfer direction is a heat transfer suppression portion 19. In the heat transfer suppression part 19, the cross-sectional area when cut at right angles to the heat transfer direction is smaller than other regions. Since the heat transfer rate is proportional to the cross-sectional area of the heat transfer medium, the heat transfer suppression unit 19 reduces the heat transfer rate and suppresses heat transfer to the base end edge 14 side (connection leg 13b side). Is done.

  In the above-described terminal fitting 10 for a board, the pair of connecting legs 13b are bilaterally symmetric, and the three leg parts 13a and 13b form a vertex of an isosceles triangle (position). However, as a variation of the other terminal fitting 10 for a board, the pair of connecting leg portions 13b are asymmetrical, and the three leg portions 13a and 13b constitute vertices of an unequal triangular shape. There is also a form having such a positional relationship (arrangement). Moreover, since the height of the fitting part 12 when each terminal fitting 10 for boards is attached to the printed circuit board P is matched with the wiring height of the electric wire W to be connected, between the terminal fittings 10 for each board In some cases, the heights of the fitting portions 12 are different from each other.

  Next, the operation of this embodiment will be described. Prior to attaching the board terminal fitting 10 to the printed board P, the electronic component E is first mounted on the printed board P and soldered in a solder reflow furnace (not shown). Thereafter, the plurality of terminal fittings 10 for a board are attached to predetermined positions on the printed board P, respectively. At the time of attachment, the holding leg 13a is press-fitted into the holding through hole Ha, and the connecting leg 13b is inserted into the connecting through hole Hb. At this time, the positional relationship between the three leg portions 13a and 13b of each board terminal fitting 10 is different from that of the other board terminal fittings 10, and in the printed board P, one board is provided. The positional relationship between the three through holes Ha and Hb corresponding to the terminal fitting 10 for the board is also different from the through holes Ha and Hb for the other terminal fittings 10 for the board. Are not attached to the wrong positions (through holes Ha, Hb).

  When the leg portions 13a and 13b are inserted into the through holes Ha and Hb, the leg portions 13a and 13b are inserted sufficiently deep until the positioning protrusions 15a and 15b are locked to the printed circuit board P. The board terminal fitting 10 is positioned in the height direction by the locking action of the positioning protrusions 15a and 15b. When the board terminal fitting 10 is attached to the printed board P, the holding leg 13a is press-fitted into the holding through-hole Ha, so there is a possibility that the board terminal fitting 10 may come out upward with respect to the printed board P. Absent.

  In addition, in a state where the total of the three leg portions 13a and 13b are inserted and attached to the printed board P, the posture of the board terminal fitting 10 is stabilized. That is, in the front-rear direction, the holding leg portion 13 a is at the same position as the conductor connecting portion 11, the connecting leg portion 13 b protrudes behind the conductor connecting portion 11, and the insertion portion 17 is located behind the conductor connecting portion 11. Therefore, the board terminal fitting 10 is restricted from tilting in the front-rear direction with respect to the printed board P. In the left-right direction, the connecting leg portions 13b that form a pair are spaced apart from each other, so that the board terminal fitting 10 is restricted from tilting with respect to the printed board P in the left-right direction. Further, since the holding leg 13a is press-fitted into the holding through-hole Ha without backlash, the press-fitting action restricts the inclination of the terminal fitting 10 for the board in the front-rear direction and the left-right direction. .

  After the three leg portions 13a and 13b are inserted into the through holes Ha and Hb, the three leg portions 13a and 13b are simultaneously soldered and fixed to the printed circuit board P by a flow solder or a spot flow. At this time, the terminal fitting 10 for a board may receive a force in the direction of coming out of the through hole H due to the jet pressure of the acting solder. However, since the holding leg 13a is press-fitted into the holding through-hole Ha, the frictional resistance caused by the press-fitting prevents not only the holding leg 13a but also the connecting leg 13b from being displaced in the removal direction. . Thereby, the terminal fitting 10 for board | substrates is reliably adhere | attached, without position-shifting in the removal direction with respect to the printed circuit board P, or tilting an attitude | position. As a method other than the above, the legs 13a and 13b can be individually soldered by a robot. In this case, if the holding leg portion 13a is first soldered and fixed to the printed circuit board P, and then the connecting leg portion 13b is soldered, the positional deviation or inclination of the board terminal fitting 10 can be reduced. Can be prevented.

  Thereafter, the conductors Wa of the plurality of electric wires W are fitted into the corresponding fitting portions 12 from above, and are fixed to the conductor connecting portions 11 so as to be conductive by soldering. When soldering, there is a concern that the heat of the fitting portion 12 is transmitted to the circuit C through the conductor connecting portion 11 and the connecting leg portion 13b. However, in this embodiment, the notch portion 18 is formed in the conductor connection portion 11 and the heat transfer suppression portion 19 having a reduced cross-sectional area is formed in the middle of the heat transfer path in the conductor connection portion 11. Heat transfer from 12 to the connecting leg 13b is suppressed.

  Furthermore, by making the connecting leg portion 13b bent into a substantially L shape, the length of the connecting leg portion 13b, that is, the heat transfer path by the connecting leg portion 13b from the conductor connecting portion 11 to the circuit C can be reduced. It is long. As described above, the length of the heat transfer path in the connecting leg portion 13b is increased, so that heat transfer from the conductor connecting portion 11 to the circuit C is suppressed. Therefore, the transfer of heat from the fitting portion 12 to the circuit C is effectively suppressed.

  As shown in FIG. 9, when the electronic component E is mounted on the printed circuit board P, the board terminal fittings 10 are attached to the printed board P, and the conductors Wa are connected to the board terminal fittings 10, the board unit 20 is configured. The In a state where the electric wire W is connected to the board terminal fitting 10, when a tensile force in the axial direction (front and rear direction in the board terminal fitting 10) acts on the electric wire W, the soldering portion between the conductor Wa and the conductor connecting portion 11 is applied. If the stress is concentrated, the soldered portion may be destroyed. However, when the board terminal fitting 10 is viewed from the side, the holding leg 13a and the connecting leg 13b are arranged on the surface of the printed board P so as to form a substantially rectangular shape. When an external force in the front-rear direction acts on the portion 11, the holding leg 13a and the connecting leg 13b are elastically deformed from a rectangle to a parallelogram. By the elastic deformation of these leg portions 13a and 13b, the stress in the soldered portion between the conductor connecting portion 11 and the conductor Wa is relieved.

  As shown in FIG. 10, the entire printed circuit board P, all the terminal fittings 10 for all boards, all the electronic components E, and the connecting portions between the terminal fittings 10 for the board and the conductors Wa are resin molds 21. The molded product 22 is configured in such a manner that the electric wire W is led out from the resin mold 21. In the mode molded body 22, the resin mold 21 waterproofs the circuit C, the connection portion between the circuit C and the terminal fitting 10 for a board, the connection portion between the terminal fitting 10 for a board and the conductor Wa, and the like.

  The board terminal fitting 10 according to the present embodiment can be attached to the printed circuit board P in a self-supporting state, and as a means for self-supporting, a conductor connecting portion 11 for connecting the conductor Wa Two connecting legs 13b inserted into the connection through hole Hb of the printed circuit board P and connected to the circuit C, and one holding leg inserted into the holding through hole Ha of the printed circuit board P 13a, and three leg portions 13a and 13b are arranged on the printed circuit board P so as to form a triangular apex. According to this configuration, since the three leg portions 13a and 13b are inserted in such a manner as to form a triangular apex with respect to the three through holes Ha and Hb, the board terminal fitting 10 is mounted on the printed board P. Can be stable and independent.

  In addition, since the holding leg 13a is press-fitted into the holding through hole Ha, the board terminal fitting 10 is attached to the printed board P in a more stable state. In addition, when a tensile force in the axial direction is applied to the electric wire W before the resin mold 21 is molded, the terminal fitting 10 for the substrate that receives the tensile force is displaced with respect to the printed circuit board P. There is concern about tilting. However, since the holding leg 13a is press-fitted into the holding through hole Ha, and the printed circuit board P and the board terminal fitting 10 are mechanically coupled, the positional deviation or inclination of the board terminal fitting 10 is increased. Is unlikely to occur.

  In this embodiment, in order to increase the effect of suppressing the heat transfer from the conductor connecting portion 11 to the circuit C, the connecting leg portion 13b is bent and the heat transfer path is lengthened. The printed circuit board P occupies a large area in the front-rear direction as a space for disposing the connecting legs 13b. On the other hand, reducing the area occupied by the three legs 13a and 13b on the printed circuit board P is technically significant in reducing the size of the printed circuit board P.

  In view of this point, in the present embodiment, of the three leg portions 13a and 13b, the holding leg portion 13a that does not contribute to suppression of heat transfer from the conductor connecting portion 11 to the circuit C is substantially perpendicular to the printed circuit board P. It was linear. Accordingly, the connection leg portion 13b can be lengthened without increasing the area occupied by the three leg portions 13a and 13b on the printed circuit board P, so that heat transfer from the conductor connection portion 11 to the circuit C can be achieved. Suppression and miniaturization of the printed circuit board P can be achieved at a high level.

<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.
(1) In the above embodiment, the number of connecting leg portions is two and the number of holding leg portions is one. However, the number of connecting leg portions may be one and the number of holding leg portions may be two.
(2) In the above embodiment, the connecting leg is bent, but the connecting leg may be linear. In this case, the holding leg may have either a bent shape or a linear shape.
(3) In the above embodiment, the holding leg is linear, but the holding leg may be bent. In this case, the connecting leg may have either a bent shape or a linear shape.
(4) In the above embodiment, both of the two connecting legs are bent, but one connecting leg may be bent and the other connecting leg may be linear.
(5) In the above embodiment, the connecting leg is bent into a substantially L shape. However, the bent shape of the connecting leg is not limited to a substantially L shape, and various other types such as Σ, <, N, etc. It can be shaped.
(6) In the above embodiment, the conductor connecting portion and the conductor are connected by soldering. However, the conductor connecting portion is connected to the conductor using means other than soldering such as crimping or pressure welding. May be.
(7) Although the case where the circuit constituent member is an electric wire has been described in the above embodiment, the present invention can also be applied to the case where the circuit constituent member is an electronic component such as a semiconductor having leads.
<Reference example>
(1) In the above embodiment, the holding leg is press-fitted into the holding through-hole. However, as a reference form, the holding leg is inserted in a state in which the holding through-hole is rattled. You can also.
(2) In the above-described embodiment, the conductor connection portion has a configuration in which a region between the fitting portion and the base end edge portion (a heat transfer path from the fitting portion to the connecting leg portion) is partially cut away. Although the notch is formed, a reference form that does not form such a notch is also conceivable. In this case, if the entire conductor connecting portion is narrowed, it is possible to suppress heat transfer from the fitting portion to the connecting leg side.
(3) In the above embodiment, the notch portion has a shape in which both side edges of the conductor connection portion are notched in a groove shape. However, as a reference mode, the notch portion has a window hole shape in the center in the left-right direction of the conductor connection portion It is also conceivable to form a notch in the form in which the hole edge is connected over the entire circumference.

P ... Printed circuit board C ... Circuit Ha ... Holding through hole Hb ... Connection through hole W ... Electric wire (circuit component)
Wa ... Conductor 10 ... Terminal fitting for board 11 ... Conductor connection part 12 ... Fitting part 13a ... Holding leg part 13b ... Connecting leg part 14 ... Base end edge part 15a, 15b ... Positioning protrusion 18 ... Notch part

Claims (4)

It is for connecting the conductors of the circuit components in the circuit of the printed circuit board,
A conductor connecting portion having a flat plate shape for connecting the conductor;
Said leads to left and right end portions of the base end edge portion of the conductor connecting portion, the printed pair of connecting legs connected before Symbol circuit is inserted into the connecting through-hole of the substrate,
The lateral middle portion connected to the flush with the in the conductor connecting portion the base end edge portion of, Bei give a single holding legs to be press-fitted into the through hole holding the printed circuit board,
Prior Symbol printed circuit board, a terminal fitting substrate for the legs of the three are arranged so as to form a vertex of a triangle,
A fitting portion for fitting and soldering the conductor is formed at the distal end portion of the conductor connecting portion opposite to the base edge portion,
As a means for preventing heat transfer from the fitting portion to the pair of connecting leg portions, a region between the fitting portion and the base end edge portion is provided on both left and right side edge portions of the conductor connecting portion. A terminal fitting for a board, wherein a pair of left and right cutouts are formed in a partially cutout form . The conductor connection portion is configured to be connected to the conductor by soldering,
2. The terminal fitting for a board according to claim 1 , wherein the connecting leg has a bent shape . 3. The terminal fitting for a board according to claim 2, wherein the holding leg portion has a linear shape substantially perpendicular to the printed board . 4. The positioning projection according to any one of claims 1 to 3 , wherein a positioning projection is formed on the leg portion to be engaged with an opening edge of the through hole in a state where the leg portion is inserted into the through hole. The terminal fitting for a board according to claim 1 .

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