JP2015118736A - Connector terminal for press fit and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector terminal for press fit capable of improving instability of contact loads due to tolerance (variation) of a through hole diameter on a printed circuit board by pressurizing contact pieces to be made into thin plate shapes, and a method for manufacturing the same.SOLUTION: A connector terminal for press fit comprises: a pin part 11 (pin part formation area 1); a shaft part 12 (a shaft part formation area 2); and a contact part 14 (contact part formation area 5) in which a plurality of contact pieces 13 (piece parts 5c) are arranged so as to surround the shaft part 12 in a state of forming a projection outside. In addition, connection parts 15, 16 (marginal parts 5a, 5b) with C-shaped cross sections surrounding the shaft part 12 are provided on tip sides and base end sides of the plurality of contact pieces 13 constituting the contact part 14. The contact pieces 13 are formed like wide plate by pressurizing a metal plate to be made into thin plate shapes. Thus, punch strength can be secured since intervals of slits 4 can be sufficiently secured when punching is performed to the metal plate.

Description

  The present invention relates to a press-fit connector terminal used by being inserted into a conductive through hole of a printed circuit board and a method for manufacturing the same.

  Conventionally, there are various types of press-fit connector terminals such as a needle eye, C-type, N-type, and Σ-type in cross-section of the terminal contact portion. “Press-fit connector terminals” are known.

  The “press-fit connector terminal” described in Patent Document 1 is formed by subjecting a single metal plate 10x having elasticity shown in FIG. 9 to a predetermined bending process, as shown in FIG. In addition, a pin portion 11x having a U-shaped cross section and a central shaft portion 12x provided on the tip side thereof, and a plurality of contact pieces 13x having a rectangular shape are arranged in the longitudinal direction L of the middle shaft portion 12x. And a contact portion 14x formed so as to surround the middle shaft portion 12x in a state of projecting outward. On the distal end side and the proximal end side of the plurality of contact pieces 13x constituting the contact portion 14x, continuous portions 15x and 16x having a C-shaped cross section surrounding the central shaft portion 12x are provided.

JP 2013-65543 A

The contact piece 13x of the “press-fit connector terminal” described in Patent Document 1 functions as a leaf spring, but the relation between the plate thickness and the plate width in the spring constant of the leaf spring is the cube of the plate thickness. Proportional and proportional to plate width. Therefore, the influence of the spring constant is smaller when the plate width is changed than when the plate thickness is changed. Further, when the variation amount of the through-hole hole diameter of the printed circuit board that affects the deflection amount of the leaf spring is the same, the contact load increases and decreases more when the leaf spring is thicker than when the leaf spring is thin.
This is because when the contact portion of the press-fit connector terminal is inserted into the through-hole of the printed board, the contact load of the contact piece of the contact portion that contacts the inner peripheral surface of the through-hole is as high as possible and predetermined. In order to be within the range, it is shown that the thinner the plate thickness, the more instability of the contact load can be improved.

  However, in the contact portion 14x of the “press-fit connector terminal” described in Patent Document 1, the connecting portions 15x and 16x connect the plurality of contact pieces 13x at predetermined intervals, so that the contact load is increased. If the plate width of the contact piece 13x is made as wide as possible, the distance between the contact pieces 13x is reduced, and the punch strength in the punching die when the metal plate 10x is punched is reduced, resulting in a decrease in punch strength. Therefore, the contact portion 14x has a limit in the plate width of the contact piece 13x from the viewpoint of securing the punch strength even if the contact load is increased by forming the contact piece 13x as wide as possible. In addition, since the plate thickness of the contact piece 13x is the same as that of the connecting portions 15x and 16x, the contact load may become unstable due to variations in the through-hole diameters in the printed circuit board.

  Therefore, the present invention provides a press-fit connector terminal that can improve instability of contact load due to tolerance (variation) of through-hole diameter in a printed circuit board by pressing the contact piece into a thin plate shape, and It aims at providing the manufacturing method.

  The connector terminal for press-fit according to the present invention is a contact portion to be inserted into a through hole of a printed circuit board, and has the contact portion formed by punching from an equal thickness metal plate, A plurality of contact pieces that come into contact with the through hole, and a connecting portion that connects the plurality of contact pieces at a predetermined interval so that the contact surface of the contact piece faces the inner peripheral surface of the through hole. In the press-fit connector terminal, the contact piece is formed in a wide plate shape by pressing the metal plate into a thin plate shape.

  According to the connector terminal for press-fit of the present invention, since the plate thickness of the contact piece is formed into a wide plate shape by making it into a thin plate shape by pressurization, the reduction in contact load due to the thin plate thickness is reduced. While suppressing the expansion of the plate width, it is possible not only to control the contact load to be within a predetermined range, but also to improve the instability of the contact load due to variations in through-hole diameters in the printed circuit board. Further, since the metal plate is pressed to form a wide plate-shaped contact piece, when punching out one metal plate, a sufficient width of the slit between the contact pieces can be secured. Therefore, when punching is performed, a sufficient thickness can be secured in the punch die for forming the slit, so that a decrease in punch strength can be suppressed.

  If the connecting part is formed in a thin plate at the position where the contact piece is extended, it is easy to bend from the thin plate part of the connecting part. The part can be bent easily.

  When the contact piece is pressed from one plate surface side and the other plate surface is formed in a thin plate shape without a step matching the position of the plate surface of the connecting portion, the other plate surface The mold on the S2 side can be formed into a flat plate shape, and the plate thickness of the contact piece can be determined by the pressing force of the mold pressed from the one plate surface S1 side. Therefore, the plate thickness of the contact piece can be easily controlled.

  When the connecting part is in a state where one pressed plate surface side of the contact piece is directed to the inner peripheral surface of the through hole, the diameter of the contact part can be increased, and the distance between the contact pieces facing each other is increased. Therefore, the deformation width of the elastic deformation of the contact piece when contacting the inner peripheral surface of the through hole can be increased.

  When the connecting portion is in a state in which one pressed plate surface side of the contact piece is directed to the center side of the through hole, the diameter of the contact portion can be suppressed. A contact portion can be inserted.

  The connector terminal for press-fit of the present invention is a contact portion that is inserted into a through hole of a printed circuit board, and a plurality of the contact portions that are formed by punching from an equal thickness metal plate are in contact with the through hole. Manufacture of a press-fit connector terminal comprising: a contact piece, and a plurality of contact pieces that connect the plurality of contact pieces at predetermined intervals so that the contact surface of the contact piece faces the inner peripheral surface of the through hole. In the method, a step of punching out the contour shape of the plurality of contact pieces and the connecting portion from the metal plate, and at least a position corresponding to the contact piece is pressed into a thin plate shape to form a wide plate shape. And a step of bending the connecting portion to form the contact portion, which can be manufactured by a method for manufacturing a press-fit connector terminal.

  According to the present invention, it is possible to punch a contact piece while suppressing a decrease in punch strength during punching, and the contact piece can be formed into a wide plate by pressurizing the contact piece. Further, by pressing the contact piece into a thin plate shape, it is possible to provide a press-fit connector terminal that improves the instability of the contact load due to variations in the through-hole hole diameter in the printed circuit board.

It is a perspective view which shows the connector terminal for press fits which is embodiment of this invention. It is the perspective view which looked at the connector terminal for press fits shown in FIG. 1 from the direction different from FIG. It is a left view of the connector terminal for press fits shown in FIG. It is a top view of the connector terminal for press fitting shown in FIG. It is a front view of the state which expand | deployed the metal plate which is a material of the connector terminal for press fits shown in FIG. It is a perspective view of the state where the metal plate shown in Drawing 5A developed. It is a right view of the state which the metal plate shown to FIG. 5A developed. It is an enlarged view of the contact part formation area of the state which the metal plate shown to FIG. 5B expand | deployed. FIG. 2 is a partially omitted cross-sectional view showing a state immediately before the press-fit connector terminal shown in FIG. 1 is inserted into a conductive through hole of a printed circuit board. FIG. 2 is a partially omitted cross-sectional view showing a state where the press-fit connector terminal shown in FIG. 1 is inserted into a conductive through hole of a printed circuit board. It is an expanded view of the metal plate which is the material of the conventional connector terminal for press fits. FIG. 10 is a perspective view of a conventional press-fit connector terminal manufactured by bending the metal plate shown in FIG. 9.

The press-fit connector terminal 100 according to the embodiment of the present invention is inserted into a through-hole formed in a printed circuit board and electrically connected to an electric circuit of the printed circuit board.
As shown in FIGS. 1 to 4, the press-fit connector terminal 100 has a pin portion 11 having a U-shaped cross section, a center shaft portion 12 provided on the opposite side of the pin portion 11, and a rectangular shape. A contact portion 14 formed by arranging a plurality of contact pieces 13 formed at equal intervals so as to surround the middle shaft portion 12 with its longitudinal direction being along the longitudinal direction of the middle shaft portion 12 and projecting outwardly; It has.

  Further, the plurality of contact pieces 13 are connected to the distal end side and the base end side of the plurality of contact pieces 13 which are elastic pieces constituting the contact portion 14, respectively, and are bent into an annular shape so that the middle shaft portion 12 is bent. Enclosed portions 15 and 16 having a C-shaped cross section are provided so that the contact surface of the contact piece 13 faces the inner peripheral surface of the through hole. The contact portion 14 has a structure that can be elastically reduced and expanded.

  A tapered inclined portion 17 is provided at the distal end of the continuous portion 15 located on the distal end side of the contact piece 13. A shoulder portion 18 having a portion protruding from the outer periphery of the pin portion 11 is provided at a portion near the contact portion 14 in the longitudinal direction of the pin portion 11.

On the other hand, the press-fit connector terminal 100 is formed by bending a single metal plate 10 having elasticity as shown in FIGS. 5A to 5C.
The metal plate 10 has a substantially rectangular shape having a band-shaped pin portion forming region 1 and a width 5w wider than the width 1w of the pin portion forming region 1 connected to the distal end side of the pin portion forming region 1 and the pin portion forming region 1. The contact portion forming region 5 having a plurality of slits 4 parallel to the longitudinal direction, the piece portion 5c, and the edge portions 5a and 5b that connect both ends of the piece portion 5c, respectively, and the contact connected to the tip side of the contact portion forming region 5 A band-shaped middle shaft portion forming region 2 having a width 2w narrower than the width 5w of the portion forming region 5.
On the proximal end side of the pin portion forming region 1, a shoulder portion forming region 7 that intersects the pin portion forming region 1 in a T shape is provided. Moreover, the trapezoid part 5e used as the inclination part 17 is formed in the edge part 5a.

  The pin portion 11 is formed from the pin portion formation region 1, the middle shaft portion 12 is formed from the middle shaft portion formation region 2, and the contact piece 13 and the connecting portions 15 and 16 of the contact portion 14 are formed from the contact portion formation region 5. . Further, a shoulder portion 18 is formed from the shoulder portion forming region 7.

  The width 2w of the middle shaft portion formation region 2 is narrower than the width 1w of the pin portion formation region 1, the width 3w of the folded portion 3 is narrower than the width 2w of the middle shaft portion formation region 2 (width 3w is half of the width 2w), and contact portion formation The width 5w of the region 5 is wider than the width 2w of the middle shaft portion forming region 2, and a plurality of slits 4 parallel to the longitudinal direction L (see FIG. 3) of the middle shaft portion forming region 2 are formed in the contact portion forming region 5. Yes.

Here, the manufacturing method of the connector terminal 100 for press fits is demonstrated based on drawing.
First, the contour shape of the metal plate 10 shown in FIGS. 5A to 5C is formed by punching from a metal plate of equal thickness.
Next, the piece part 5c part of the contact part formation area 5 used as the contact piece 13 is pressed with the 1st metal mold | die (not shown) from the one board surface S1 side. At this time, the other plate surface S2 side of the contact portion forming region 5 is supported by the flat second mold (not shown).

When the piece portion 5c is pressed from the one plate surface S1 side, the other plate surface S2 of the piece portion 5c is in the same plane that matches the position of the plate surface of the edge portions 5a, 5b, and the other plate of the piece portion 5c. In a state where the surface S2 and the plate surfaces of the edge portions 5a and 5b are not stepped, they are made thinner than the plate thicknesses of other regions such as the pin portion forming region 1, the central shaft forming region 2, and the shoulder portion forming region 7. Become. By doing so, the piece 5c expands toward the slit 4 side as the thickness is reduced, and the slit 4 becomes narrow, while the piece 5c is formed in a wide plate shape.
The thin plate shape may be at least the piece portion 5c, but in the present embodiment, not only the piece portion 5c corresponding to the contact piece 13, but also the continuous portion 15 obtained by extending the piece portion 5c (contact piece 13). , 16, the positions (intersections 5d) on the edge portions 5a, 5b of the contact portion forming region 5 are also formed in a thin plate shape.

As shown in FIG. 6, the piece portion 5 c and the intersecting portion 5 d that extends the piece portion 5 c and intersects the edge portions 5 a and 5 b are formed into a thin plate shape, so that one end portion of the contact portion 14 is changed from the other end portion to the other. A straight thin plate portion 5f extending to the end is formed.
The thin plate portion 5f is formed by adding a metal plate of equal thickness from the one plate surface S1 side so that the other plate surface S2 is aligned with the positions of the plate surfaces of the edge portions 5a and 5b to be the connecting portions 15 and 16. By pressing and forming into a thin plate shape, the thin plate portion 5f is formed in a plate shape wider than the plate width before pressurization.

  As shown in FIG. 5C, the piece portion 5c is pressed from one plate surface S1 side, and the other plate surface S2 is formed in a thin plate shape in accordance with the positions of the plate surfaces of the edge portions 5a and 5b. Therefore, the second mold on the other plate surface S2 side can be formed into a flat plate shape, and the plate thickness of the piece 5c is determined by the pressing force of the first mold pressed from the one plate surface S1 side. be able to. Therefore, the plate thickness of the piece 5c can be easily controlled.

  Next, in the metal plate 10 shown in FIGS. 5A to 5C, the pin section forming region 1 and the central shaft portion forming region 2 have a U-shaped cross section centering on the bent portion 6 that continues in the longitudinal direction L. After the folding, the middle shaft portion forming region 2 is bent 180 degrees toward the contact portion forming region 5 around the folding position 3 a crossing the folded portion 3.

  Thereafter, bending is performed so that the piece 5c of the contact portion forming region 5 parallel to the longitudinal direction L has a square shape, and the edge portion of the contact portion forming region 5 located in a direction intersecting the longitudinal direction L If the bending process is performed so that 5a and 5b have a C shape and the contact portion forming region 5 has a barrel shape surrounding the central shaft portion 12, the press-fit connector terminal 100 shown in FIG. 1 is completed. .

  In the press-fit connector terminal 100 shown in FIG. 1, one side 5c (contact piece 13) is pressed when the edge portions 5a and 5b of the contact portion forming region 5 are bent into a C shape. The plate surface S1 side is inward (center side of the through hole), and the other plate surface S2 side opposite to the plate surface S1 is directed to the inner peripheral surface of the through hole. However, the contact portion 14 may be formed by bending the edge portions 5a and 5b into a C shape so that one plate surface S1 is directed to the inner peripheral surface of the through hole.

Like the press-fit connector terminal 100 shown in FIG. 1, the one plate surface S1 side of the piece 5c is directed toward the center of the through hole (the other plate surface S2 side faces outward). In the state), since the diameter of the contact portion 14 can be increased and the distance between the opposing contact pieces 13 can be widened, the deformation width of the elastic deformation of the contact piece 13 when contacting the inner peripheral surface of the through hole is increased. Can do.
In the state in which one plate surface S1 side of the piece portion 5c is directed toward the inner peripheral surface of the through hole and the one plate surface S1 side is in contact with the through hole, the diameter of the contact portion 14 Therefore, the contact portion 14 can be inserted even with a small-diameter through hole. Therefore, since the area occupied by the through hole in the printed board can be reduced, the printed board can be miniaturized.

  5A to 5C, the central shaft portion forming region 2 is bent so that the cross section is U-shaped around the bent portion 6, and the central shaft portion 12 shown in FIGS. Although it is formed, a strip-shaped metal plate piece that does not fold the middle shaft portion forming region may be used as long as a sufficient strength can be secured in the middle shaft portion forming region even if the cross section is not U-shaped.

A state where the press-fit connector terminal 100 manufactured as described above is inserted into the through hole of the printed circuit board will be described with reference to the drawings.
As shown in FIGS. 7 and 8, when the contact portion 14 is inserted into the through-hole 21 on which the through-hole plating 22 is applied in the printed circuit board 20, the plurality of contact pieces 13 constituting the contact portion 14 are respectively center shaft portions. Therefore, the insertion force during insertion can be reduced. In addition, since an excessive pressing force (contact pressure) is not applied from the contact portion 14 toward the inner peripheral surface of the through hole 21, the plated surface of the through hole 21 is not deteriorated and the printed circuit board 20 is whitened. Can also be prevented. Furthermore, even if the pin portion 11 is inclined, the elastic displacement of the contact piece 13 is suppressed by contacting the central shaft portion 12 and does not cause excessive displacement beyond the elastic displacement, so that the contact piece 13 is hardly plastically deformed. .

  In addition, since the plurality of contact pieces 13 constituting the contact portion 14 inserted into the through hole 21 are in contact with a plurality of locations on the inner peripheral surface of the through hole 21 while maintaining the biasing force in the diameter increasing direction. In addition, contact failure hardly occurs and contact reliability is excellent.

  Furthermore, as shown in FIG. 1 and FIG. 2, because the plurality of contact pieces 13 are provided with continuous portions 15 and 16 having a C-shaped cross section surrounding the central shaft portion 12 on the distal end side and the proximal end side, As shown in FIG. 7 and FIG. 8, the arrangement state of the plurality of contact pieces 13 is stable when the contact portion 14 is inserted into the through hole 21 and at any time after the insertion. Effective for improving reliability.

Here, the contact portion 14 of the press-fit connector terminal 100 will be described in detail.
As described above, the contact piece 13 functioning as a leaf spring of the contact portion 14 is controlled by the plate thickness in order to keep the contact load when contacting the inner peripheral surface of the through hole 21 within a predetermined range. However, it is easier to control by controlling the sheet width because the degree of change in contact load is small.

  In the contact portion 14 according to the present embodiment, since the plate thickness of the contact piece 13 is formed in a thin plate shape and the plate width is increased, the reduction in contact load due to the decrease in the plate thickness is increased. In addition to keeping the contact load within a predetermined range, the instability of the contact load due to the variation in the diameter of the through hole 21 in the printed circuit board 20 can be improved.

  In addition, after punching the metal plate, the metal plate is pressed into a thin plate shape to form a wide plate-like contact piece 13 (thin plate portion 5f). Therefore, when punching one metal plate, the piece portion 5c The width of the slit 4 between them can be sufficiently secured. Therefore, when punching is performed, a sufficient thickness can be ensured for the punch of the punching die for forming the slit 4, and thus a decrease in punch strength can be suppressed.

Further, as the thin plate portion 5f, not only the contact piece 13 but also the crossing portion 5d that extends the piece portion 5c (contact piece 13) and intersects the edge portions 5a and 5b is formed in a thin plate shape. Since it is easy to bend from the level | step-difference part by each cross | intersection part 5d formed in (5), even if the length of the connection parts 15 and 16 is short, the connection parts 15 and 16 can be bent easily. Therefore, it is possible to reduce the diameter of the contact portion 14 while maintaining a contact pressure equivalent to the conventional one.
Furthermore, since the press-fit connector terminal 100 is formed by bending a single metal plate 10 having elasticity, the number of parts can be reduced and the manufacturing cost can be reduced.

  The press-fit connector terminal according to the present invention can be widely used in the electrical / electronic equipment industry, the automobile industry, and the like as a member inserted into a through hole of a printed circuit board.

DESCRIPTION OF SYMBOLS 1 Pin part formation area 1w, 2w, 3w, 5w Width 2 Middle shaft part formation area 3 Folding part 3a Folding position 4 Slit 5 Contact part forming area 5a, 5b Edge part 5c Single part 5d Intersection part 5e Trapezoid part 5f Thin plate part 6 Bending portion 7 Shoulder portion forming region 10 Metal plate 11 Pin portion 12 Middle shaft portion 13 Contact piece 14 Contact portion 15, 16 Continuous portion 17 Inclined portion 18 Shoulder portion 20 Printed circuit board 21 Through hole 22 Through hole plating 100 Connector for press fit Terminal L Longitudinal direction S1 One plate surface S2 The other plate surface

The connector terminal for press-fit according to the present invention is a contact portion to be inserted into a through hole of a printed circuit board, and has the contact portion formed by punching from an equal thickness metal plate, A plurality of contact pieces that come into contact with the through hole, and a connecting portion that connects the plurality of contact pieces at a predetermined interval so that the contact surface of the contact piece faces the inner peripheral surface of the through hole. In the connector terminal for press-fit, the contact piece is formed in a wide plate shape by pressing the metal plate into a thin plate shape, and the continuous portion is formed with the continuous portion extending the contact piece. The intersecting position is also formed in a thin plate shape .

The connecting part is, since it is formed on the contact piece positioned even thin plate which extended, and is easily bent from the thin plate portion of the connecting portion, even if short length of the connecting portion, continuously provided The part can be bent easily.

The connector terminal for press-fit of the present invention is a contact portion that is inserted into a through hole of a printed circuit board, and a plurality of the contact portions that are formed by punching from an equal thickness metal plate are in contact with the through hole. Manufacture of a press-fit connector terminal comprising: a contact piece, and a plurality of contact pieces that connect the plurality of contact pieces at predetermined intervals so that the contact surface of the contact piece faces the inner peripheral surface of the through hole. in the method, a step of punching out a contour of said coupling parts and the plurality of contact pieces of the metal plate, and a position corresponding to the previous SL contact piece, crossed with the continuous portion that extends the contact piece by a thin plate and a position pressurized, process and method for producing a press-fit connector pin and a step to the contact portion by bending the connecting portion forming said contact piece wider plate It is possible to more production.

Claims (6)

A contact portion to be inserted into a through hole of the printed circuit board, the contact portion formed by punching from a metal plate of equal thickness,
The contact portion connects a plurality of contact pieces that are in contact with the through hole and the plurality of contact pieces at a predetermined interval, and a contact surface of the contact piece is directed to an inner peripheral surface of the through hole. In the connector terminal for press-fit consisting of
The contact piece is a connector terminal for press-fit that is formed in a wide plate shape by pressing the metal plate into a thin plate shape.   The press-fit connector terminal according to claim 1, wherein the connecting portion is formed in a thin plate shape at a position where the contact piece is extended.   The said contact piece is pressurized from one board surface side, The other board surface was formed in the thin plate shape without the level | step difference which matched the position of the board surface of the said connection part. Connector terminal for press-fit.   The press-fit connector terminal according to claim 3, wherein the continuous portion is in a state in which one pressed plate surface side of the contact piece is directed to an inner peripheral surface of the through hole.   The press-fit connector terminal according to claim 3, wherein the connecting portion is in a state in which one pressed plate surface side of the contact piece is directed to the center side of the through hole. A plurality of contact pieces inserted into through-holes of a printed circuit board, wherein the contact parts formed by punching from an equal-thick metal plate are in contact with the through-holes, and the plurality of contact pieces In a method for manufacturing a press-fit connector terminal comprising a continuous portion that connects the contact pieces at predetermined intervals and places the contact surface of the contact piece toward the inner peripheral surface of the through hole.
Punching out the contour shapes of the plurality of contact pieces and the connecting portion from the metal plate;
At least a step of forming a wide plate by pressurizing a position corresponding to the contact piece into a thin plate, and
A method of manufacturing a connector terminal for press-fit, including a step of bending the continuous portion to form the contact portion.

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