JP5979279B2 - Press-fit connector terminal and manufacturing method thereof - Google Patents

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 one metal plate 10x having elasticity shown in FIG. 12 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. Connected portions 15x and 16x having a C-shaped cross section surrounding the central shaft portion 12x are provided on the distal end side and the proximal end side of the plurality of contact pieces 13x constituting the contact portion 14x, respectively.

JP 2013-65543 A

In the press-fit connector terminal, since the contact portion 14x is inserted into the conductive through hole of the printed circuit board, the diameter of the contact portion 14x is as small as about 1.7 mm. In addition, since further reduction in the diameter of the through hole is expected to progress further, it is required to make the contact portion 14x thinner.
The “press-fit connector terminal” described in Patent Document 1 is formed by punching or bending a single metal plate, but the metal plate has a thickness of about 0.4 mm. In addition, it is difficult to bend the continuous portion into a C-shaped circular arc that surrounds the central shaft portion.

Accordingly, an object of the present invention is to provide a press-fit connector terminal capable of reducing the diameter of the contact portion while maintaining a contact pressure equivalent to that of a contact portion of a conventional connector terminal, and a method for manufacturing the same. To do.

The present invention has a contact portion to be inserted into a through hole of a printed circuit board, and the contact portion is in a curved state in which the elastic plate surface is in contact with the through hole and faces outward and protrudes outward. and a plurality of contact pieces forming, a plurality of contact pieces of the tip side and the connector for press-fitting and a connecting portion the terminal forming the cross-sectional C-shape the proximal and continuously provided, said continuously provided The portion is formed to be thinner than the contact piece.
The press-fit terminal of the present invention corresponds to a plurality of contact pieces that are inserted into and contacted with through holes of a printed circuit board, and a connecting portion that continuously connects the distal end side and the proximal end side of the plurality of contact pieces. The position of one elastic metal plate is sandwiched and pressed by a mold so that the connecting portion is processed so that the plate thickness is thinner than the contact piece, and the plurality of contact pieces and the The connecting portion is punched from the metal plate, and the connecting portion is bent into a C-shaped cross section so that the plate surface of the metal plate to be the contact piece faces outward, so that the contact piece is convex outward. It can manufacture by the manufacturing method of the connector terminal for press fits which forms the contact part used as a curved state.

  According to the press-fit connector terminal of the present invention, since the plate thickness of the continuous portion is formed to be thinner than the plate thickness of the contact piece, it is easy to bend the continuous portion thinly. Therefore, the diameter of the contact portion can be formed thin.

  As for the thickness of the contact piece, it is desirable that the thickness of the central portion is thick and the thickness of the end portion is thin. If the contact piece is thick at the center and thin at the end, the contact load of the contact piece can be maintained while facilitating the bending of the connecting portion.

  As for the thickness of the said connection part, it is desirable to form in uniform thickness in the width direction and the circumferential direction. Since the thickness of the continuous portion is uniform, the continuous portion is easily bent, and stress concentration at the time of bending is unlikely to occur, and bending strength can be ensured.

  It is desirable that a middle shaft portion surrounding the plurality of contact pieces is provided, and the continuous portion is bent so as to surround the middle shaft portion.

  According to the present invention, even if the connecting portion is short, the connecting portion can be easily bent. Therefore, it is possible to reduce the diameter of the contact portion while maintaining the same contact pressure as the contact portion of the conventional connector terminal. Is possible.

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 front view of the connector terminal for press fits shown in FIG. It is the sectional view on the AA line in FIG. It is the figure seen from the arrow B direction in FIG. 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 a material of the connector terminal for press fits shown in FIG. It is a front view of the state which expand | deployed the contact part of the connector terminal for press fits shown in FIG. It is a side view of the state which expand | deployed the contact part of the connector terminal for press fits shown in FIG. It is an expanded view of the metal plate for manufacturing the 1st modification of a contact part. It is a side view of the metal plate shown to FIG. 10A. It is an expanded view of the metal plate for manufacturing the 2nd modification of a contact part. It is a side view of the metal plate shown to FIG. 11A. It is an expanded view of the metal plate which is the material of the conventional connector terminal for press fits. FIG. 13 is a perspective view of a conventional press-fit connector terminal manufactured by bending the metal plate shown in FIG. 12.

The press-fit connector terminal 100 according to the embodiment of the present invention is formed by bending a single metal plate 10 having elasticity as shown in FIG.
As shown in FIG. 1 to FIG. 3, the press-fit connector terminal 100 includes a pin portion 11 having a U-shaped cross section and a central shaft portion 12 provided on the distal end side of the pin portion 11 and a plurality of contact shapes having a square shape. And a contact portion 14 formed by arranging the pieces 13 at equal intervals so as to surround the middle shaft portion 12 with the longitudinal direction thereof being along the longitudinal direction of the middle shaft portion 12 and projecting outward. . In addition, the distal end side and the proximal end side of the plurality of contact pieces 13 that are elastic pieces constituting the contact portion 14 surround the axis of the press-fit connector terminal 100 and surround the middle shaft portion 12, respectively. The continuous portions 15 and 16 are provided. The contact portion 14 has a structure that can be elastically reduced and expanded.

  Accordingly, as shown in FIGS. 6 and 7, 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 Since it is elastically deformed so as to approach the middle shaft portion 12 and is accommodated in the through hole 21, 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 FIGS. 6 and 7, the arrangement state of the plurality of contact pieces 13 is stable both when the contact portion 14 is inserted into the through hole 21 and after the insertion. It is effective in improving

  On the other hand, the press-fit connector terminal 100 is formed by bending a single metal plate 10 having elasticity as shown in FIG. The metal plate 10 includes a belt-shaped pin portion forming region 1, a belt-shaped central shaft portion forming region 2 connected to the tip side of the pin portion forming region 1, and a folded portion 3 on the tip side of the central shaft portion forming region 2. A continuous contact portion forming region 5.

  Referring to FIGS. 1 and 8, pin portion 11 is formed from pin portion formation region 1, middle shaft portion 12 is formed from middle shaft portion formation region 2, and contact piece 13 of contact portion 14 is formed from contact portion formation region 5. And the connecting portions 15 and 16 are formed.

  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. Further, the folded portion 3 is provided at a position close to one side edge 2 a of the central shaft portion forming region 2.

  The contact portion 14 is required to have a thinner outer diameter as the through hole 21 shown in FIG. 6 is further reduced in diameter. Therefore, the plate thickness of the continuous portions 15 and 16 is formed to be thinner than the contact piece 13. By doing so, since the thickness is thin even if the length of the continuous portions 15 and 16 is short, it is easy to reduce the diameter by bending the continuous portions 15 and 16.

  In the present embodiment, as shown in FIGS. 9A and 9B, in the longitudinal direction of the press-fit connector terminal, the thickness of the contact piece 13 is gradually increased from the central portion 13a toward the end portion 13b. It is formed to be thin. The plate | board thickness which forms the connection parts 15 and 16 is equal thickness in both the width direction and the length direction (circumferential direction), and is formed at the same thickness as the end part 13b of the contact piece 13, so that at least The contact piece 13 is formed thinner than the central portion 13a.

  As shown in FIG. 7, when the contact portion 14 comes into contact with the inner peripheral surface of the through hole 21, the contact portion 14 is squeezed by the inner peripheral surface of the through hole 21 from the curved state in which the contact piece 13 protrudes outward. As a result, the contact piece 13 is elastically deformed to be in an extended state. However, as shown in FIG. 9B, since the thickness of the central portion 13a of the contact piece 13 is thicker than the end portion 13b, it is possible to suppress a decrease in the spring property of the contact piece 13, so that the connecting portions 15 and 16 are bent. This makes it possible to maintain the contact load of the contact piece 13.

Next, a method for manufacturing the press-fit connector terminal 100 will be described with reference to the drawings.
First, as shown in FIG. 9B, the contact piece 13 that gradually decreases in thickness so that the bottom of the mountain spreads toward the end portion 13 b with the central portion 13 a on the one surface side as a top portion, and the end portions of the contact piece 13 One metal plate before punching is sandwiched between one mold having a formation space that models the continuous portions 15 and 16 having the same thickness as 13b and the other mold having a flat plate shape.
And one metal mold | die which has a formation space is pressed on the other metal mold | die, and the process corresponding to the contact piece 13 and the connection parts 15 and 16 is made thin. When pressing the connecting portions 15 and 16 and the contact piece 13, one side is pressed to reduce the plate thickness, so that one metal plate before punching is placed on a flat plate mold. Since it can be pressed, the processing is easy. Moreover, since one metal mold | die can be made thin continuously from the center part 13a to the edge part 13b, it can manufacture in a short processing time.
Next, the metal plate subjected to the process of reducing the thickness is punched to form the metal plate 10 shown in FIG.

  Next, in the metal plate 10 shown in FIG. 8, after the pin portion forming region 1 and the middle shaft portion forming region 2 are bent so that the cross section is U-shaped around the bent portion 6 continuous in the longitudinal direction L. Then, the contact portion forming region 5 is bent 180 degrees toward the middle shaft portion forming region 2 around the turning position 3 a that crosses the turning portion 3.

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

As described above, the press-fit connector terminal 100 is formed by thinning the continuous portions 15 and 16 formed in a C-shape by being bent, so that even if the length of the continuous portions 15 and 16 is short, Since the connecting portions 15 and 16 can be easily bent, it is possible to reduce the diameter of the contact portion 14 while maintaining a contact pressure equivalent to that of the related art.
Moreover, since the thickness of the connection parts 15 and 16 is equal, the connection parts 15 and 16 are easily bent, it is hard to cause stress concentration at the time of bending, and bending strength can be ensured.
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.

Next, a modified example of the contact portion will be described based on the drawings.
The contact piece 13s in the contact part 14s according to the first modification shown in FIGS. 10A and 10B and the contact piece 13t in the contact part 14t according to the second modification shown in FIGS. 11A and 11B are the contacts shown in FIG. 9B. Similar to the piece 13, the plate thickness is gradually reduced from the central portion 13 a toward the end portion 13 b. The continuous portions 15s and 16s have the same thickness in both the width direction and the length direction (circumferential direction).
However, as shown in FIG. 10B, in the contact piece 13s in the first modification, the thickness T11 of the end portion 13b is thinner than the thickness T12 of the central portion 13a, and the thickness T13 of the connecting portions 15s and 16s is equal. However, the thickness is smaller than the thicknesses T11 and T12 of the central portion 13a and the end portion 13b of the contact piece 13s (T12>T11> T13).

  In this way, since the plate thickness of the continuous portions 15s and 16s is entirely thinner than the plate thickness of the contact piece 13s, the thick portion of the contact piece 13s increases, so that the contact load is ensured. Is easy.

As shown in FIG. 11B, the contact piece 13t in the second modification example is formed such that the thickness T21 of the end portion 13b is thinner than the thickness T22 of the center part 13a, as in the first modification example.
However, by providing an inclined surface from the central portion 13a of the contact piece 13t to the end portion of the connecting portions 15t and 16t beyond the end portion 13b, the connecting portions 15t and 16t are gradually thinned. The thickness T21 on the contact piece 13t side is thick, and the thickness T23 on the opposite side to the contact piece 13t side is thin (T22>T21> T23).

  As described above, since the thickness is continuously reduced on the inclined surface from the central portion 13a of the contact piece 13t to the connecting portions 15t and 16t, the change in thickness is gentle and there is no boundary between the thicknesses. Difficult to concentrate.

  The above-described press-fit connector terminals exemplify the present invention, and the press-fit connector terminals according to the present invention are not limited to these embodiments.

The press-fit connector terminal and the manufacturing method thereof according to the present invention can be widely used in the electrical / electronic equipment industry, the automobile industry, and the like as a member to be 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 2a Side edge 3 Folding part 3a Folding position 4 Slit 5 Contact part forming area 5a, 5b Edge part 5c Single part 6 Bending part 10 Metal plate 11 Pin portion 12 Middle shaft portion 13, 13s, 13t Contact piece 13a Central portion 13b End portion 14, 14s, 14t Contact portion 15, 15s, 15t, 16, 16s, 15t Connecting portion 20 Printed circuit board 21 Through hole 22 Through hole plating 100 Connector terminal for press fit L Longitudinal direction

Claims (5)

Having a contact portion to be inserted into the through hole of the printed circuit board;
The contact portion is in contact with the through-hole, a plurality of contact pieces in a curved state in which an elastic plate surface faces outward and protrudes outward, and distal and proximal sides of the contact pieces And a press-fit connector terminal provided with a continuous portion having a C-shaped cross section .
A connector terminal for press-fit, wherein the connecting portion is formed thinner than the contact piece.   2. The press-fit connector terminal according to claim 1, wherein the contact piece is formed such that a central plate is thick and an end plate is thin.   The press-fit connector terminal according to claim 2, wherein the continuous portion is formed to have a uniform thickness in both the width direction and the circumferential direction. A middle shaft portion surrounding the plurality of contact pieces is provided;
The press-fit connector terminal according to claim 1, wherein the connecting portion is bent so as to surround the middle shaft portion.   One elastic metal corresponding to a plurality of contact pieces inserted into and through the through hole of the printed circuit board and a connecting portion connecting the front end side and the base end side of the plurality of contact pieces. By pressing the position of the plate sandwiched between molds, the connecting portion is processed so that the plate thickness is thinner than the contact piece,
  The plurality of contact pieces and the continuous portion are punched from the metal plate,
  For press-fit that forms a contact portion in which the contact piece is bent outwardly by bending the connecting portion into a C-shaped cross section so that the plate surface of the metal plate serving as the contact piece faces outward Manufacturing method of connector terminals.

Images