WO2018070318A1

WO2018070318A1 - Press-fit terminal

Info

Publication number: WO2018070318A1
Application number: PCT/JP2017/036107
Authority: WO
Inventors: 拓哉山中; 伊藤　哲也; 和将小林; 雄一中西; 茂樹島田
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2016-10-12
Filing date: 2017-10-04
Publication date: 2018-04-19

Abstract

This press-fit terminal, which is inserted into a through hole provided in a circuit board and is conductively connected to the through hole while elastically contacting the inner wall of the through hole, is provided with: a tip section (12) positioned on the tip side in the insertion direction into the through hole; a base section (14) positioned on the opposite side to the tip section (12); and a pair of elastic contact pieces (13, 13) facing each other with an opening (16) therebetween, and positioned between and connecting the tip section (12) and the base section (14), wherein stress distributing sections (17), which protrude in the same direction as the direction in which the elastic contact pieces (13) outwardly extend, are provided to at least one among a region including border portions between the tip section (12) and the elastic contact pieces (13), and a region including border portions between the base section (14) and the elastic contact pieces (13).

Description

Press-fit terminal

The technology disclosed in this specification relates to a press-fit terminal.

2. Description of the Related Art Conventionally, a press-fit terminal 100 that is press-fitted into a through hole 121 of a wiring board 120 incorporated in an electronic device and is electrically connected to a conductive circuit without soldering, and is contact-fixed to the wiring board 120 by elastic force. It is known (see FIG. 10).

The press-fit terminal 100 has a slit portion 106 at the center in the width direction of the tab-like terminal, and has the largest outer width among the pair of beam members 103 bulged outward across the slit portion 106. By setting the width between the outer edge portions of the contact portion 105 to be larger than the inner diameter of the through hole 121 and press-fitting the beam member 103 into the through hole 121 while bending the beam member 103 into the slit portion 106, They are brought into contact with each other so as to be conductively connected.

JP 2004-127610 A WO2008 / 038331

In such a press-fit terminal 100, in order to guarantee connection reliability against the influence of temperature, vibration, etc., it is required to secure a certain contact load or more with respect to the inner wall of the through hole 121. In order to increase the contact load, it is conceivable to increase the rigidity of the beam member 103 by increasing the thickness of the terminal 100 or increasing the width of the beam member 103.

However, if the rigidity of the press-fit terminal 100 is set high as described above, the stress (strain) applied to the press-fit terminal 100 increases with the deformation of the beam member 103 when inserted into the through hole 121. Such stress is caused by a portion of the press-fit terminal 100 that starts to be deformed particularly when inserted into the through-hole 121, that is, a root portion on the distal end side in the insertion direction of the beam member 103 (positioned at the distal end of the slit portion 106. And is concentrated in the vicinity of the outer edge (the region indicated by W in FIG. 10) that is extended by deformation. Such excessive stress concentration causes the press fit terminal to crack or break.

The technique disclosed in this specification is intended to disperse the stress applied to the press-fit terminal in accordance with the deformation when inserting the through hole.

The technology disclosed in this specification is a press-fit terminal that is inserted into a through-hole provided in a circuit board and is conductively connected to the through-hole in a state of elastically contacting the inner wall of the through-hole. A distal end portion located on the distal end side in the insertion direction with respect to the through hole, a base portion located on the opposite side of the distal end portion, and arranged to face each other through an opening, and the distal end portion and the base portion A pair of elastic contact pieces positioned between and connecting the two and projecting outward, a region including a boundary portion between the tip portion and the elastic contact piece, and the base and the elastic contact At least one of the regions including the boundary with the piece is provided with a stress dispersion portion that protrudes in the same direction as the protruding direction of the elastic contact piece.

According to such a configuration, a portion of the press-fit terminal that starts to be deformed particularly when inserted into the through hole, that is, a region including a boundary portion between the tip portion and the elastic contact piece, and the base portion and the elastic portion The stress that has been intensively generated at that position is dispersed by the stress dispersion portion provided in at least one of the regions including the boundary portion with the contact piece. The mechanism is thought to be as follows.

In other words, in a press-fit terminal, if a stress distribution part that protrudes outward is provided in a part where stress is concentrated, the range of the area that receives the stress is expanded by the stress distribution part, and the stress applied to the unit area (maximum Value) becomes smaller. Therefore, the stress generated intensively can be dispersed.

The stress dispersing portion may be bulged in an arc shape toward the overhanging direction. According to such a configuration, the stress applied to the stress distribution portion is more easily distributed more uniformly than a configuration in which the stress distribution portion protrudes, for example, in a protruding shape having a corner portion or a triangular shape. Note that the arc shape includes a case where both ends are curved or flat so as to be gently continuous with the elastic contact piece and the tip or base.

Further, an inner stress dispersion portion that protrudes toward the inside of the opening may be provided on the inner peripheral edge of the region where the inclination angle of the pair of elastic contact pieces changes in the opening.

Or the elasticity provision part which connects the said pair of elastic contact piece between a pair of elastic contact pieces, and provides an elastic force is provided, and it opens in the boundary part of an elasticity provision part, an elastic contact piece, and an opening part It is good also as a structure in which the inner side stress distribution part which protrudes toward the inner side of a part is provided.

According to these configurations, the stress can be distributed over a wide range on the inner peripheral side of the opening that is stretched by deformation during insertion into the through-hole and generates a large amount of stress. Can be reduced.

Furthermore, the inner stress dispersion portion may be bulged in an arc shape from the inner peripheral edge of the opening. According to such a configuration, the stress applied to the stress distribution portion is more easily distributed more uniformly than a configuration in which the stress distribution portion protrudes, for example, in a protruding shape having a corner portion or a triangular shape. The arc shape includes a case where both end portions are curved or flat so as to be gently connected to the elastic contact piece and the elasticity applying portion.

According to the technique disclosed in this specification, a press-fit terminal capable of dispersing stress due to deformation at the time of inserting a through hole is obtained.

Plan view of the press-fit terminal of Embodiment 1 Plan sectional view showing the process of inserting the press-fit terminal into the through hole of the circuit board Plan sectional view showing the state where the press-fit terminal is inserted into the through hole of the circuit board Plan sectional drawing which shows the process in which the press fit terminal of Embodiment 2 is inserted in the through hole of a circuit board Plan sectional view showing the state where the press-fit terminal is inserted into the through hole of the circuit board Plan view of the press-fit terminal of Embodiment 3 Plan view of press-fit terminal of embodiment 4 Cross section of press-fit terminal Cross-sectional view of a press-fit terminal according to another embodiment Plan sectional view showing a state where a conventional press-fit terminal is inserted into a through hole of a circuit board

<Embodiment 1>
A first embodiment will be described with reference to FIGS.

The press-fit terminal 10 is press-fitted into the through-hole 21 of the circuit board 20, and is formed into an elongated tab shape as a whole by pressing a metal plate material having excellent conductivity such as a copper alloy. . In the following description, the lower side in FIG. 1 is the front side (insertion direction) or the tip side, and the upper side is the rear side.

The press-fit terminal 10 of the present embodiment is a needle-eye press-fit terminal, and includes a terminal portion 11 inserted into the through hole 21 of the circuit board 20 and an attachment portion 19 for mounting on another terminal (not shown). And.

A tip portion 12 disposed on the tip side (lower side in FIG. 1) of the terminal portion 11 is tapered to guide to the through hole 21 of the circuit board 20, and is opposite to the tip portion 12 (FIG. 1). The upper side) is a base portion 14 connected to the mounting portion 19 described above.

Among the terminal portions 11, a pair of elastic contact pieces 13 are provided between the tip portion 12 and the base portion 14 to connect the tip portion 12 and the base portion 14 and project outward in a mountain shape. The outer side edge portion of the elastic contact piece 13 is continuous with the side edge portion of the tip portion 12 narrowed toward the tip, and gradually protrudes outward (the overhang direction) toward the rear, and the center in the front-rear direction. The top portion 15 is the outermost portion. Further, the rear side of the top portion 15 is gradually reduced in diameter, and is continuous with the side edge portion of the base portion 14 that is slightly reduced in diameter toward the rear.

Between the pair of elastic contact pieces 13, a long hole-like opening 16 extending in the front-rear direction is formed. That is, the pair of elastic contact pieces 13 are disposed to face each other through the opening 16. The hole width of the opening 16 is set so that the central portion in the front-rear direction is slightly wider.

The portion of the pair of elastic contact pieces 13 that protrudes to the outermost side, that is, the top portion 15, is located at the same position in the front-rear direction as the wide portion of the opening 16. Moreover, the width dimension of each elastic contact piece 13 is set so that the center part (position of the top part 15) in the front-back direction is large and both end parts (front end and rear end) are small.

The press-fit terminal 10 of the present embodiment has an outer side (elasticity) from the side edge portion in a region including the boundary portion between the tip portion 12 and the elastic contact piece 13, in other words, at a position corresponding to the tip of the opening portion 16 in the front-rear direction. A stress dispersion portion 17 is provided that bulges in the direction in which the contact piece 13 protrudes. The stress dispersion portion 17 bulges in a circular shape in which both ends thereof are gently continuous with the tip portion 12 and the elastic contact piece 13, in other words, a gentle mountain shape.

More specifically, the stress dispersion portion 17 has a smooth curved surface at the outer edge thereof, the boundary portion between the stress dispersion portion 17 and the tip portion 12, and the elastic contact with the stress dispersion portion 17. Both the boundary part with the piece 13 are comprised by the smooth curved surface.

A dimension L2 between the pair of top portions 18 of these stress dispersion portions 17 is set to be smaller than a dimension L0 between the pair of top portions 15 of the elastic contact piece 13 in a natural state, and the press-fit terminal 10 is a circuit board. It is set so as not to contact the inner wall of the through hole 21 in a state where it is inserted into the 20 through holes 21. That is, the dimension L2 between the pair of top portions 18 of the stress dispersion portion 17 is set to be smaller than the inner diameter L1 of the through hole 21.

In addition, these front-end | tip part 12, a pair of elastic contact pieces 13, the base 14, the stress dispersion | distribution part 17, and the attachment part 19 are all made into plate shape of the same board thickness, and are distribute | arranged in the same surface. Yes.

Next, the operation of the press-fit terminal 10 of this embodiment will be described. As shown in FIG. 2, when the press-fit terminal 10 is inserted into the through hole 21 of the circuit board 20 from the distal end portion 12 side, first, the side edge portion on the distal end side of the pair of elastic contact pieces 13 is the opening of the through hole 21. It hits the edge. When the press-fit terminal 10 is further inserted into the through hole 21, the elastic contact piece 13 is gradually bent into the opening 16 by pressing the side edge of the elastic contact piece 13 against the opening edge of the through hole 21. While entering the through hole 21.

Then, when the top portions 15 of the pair of elastic contact pieces 13 pass through the opening edge portion of the through hole 21, the top portion 15 is pressed against the inner wall of the through hole 21. Furthermore, by inserting to a predetermined position, the inside of the through hole 21 and the press-fit terminal 10 are electrically connected to each other at a proper position. (See FIG. 3).

In this way, when the pair of elastic contact pieces 13 are pressed against the inner wall of the through hole 21 to be deformed, the portion of the press-fit terminal 10 where deformation starts particularly, that is, the distal end portion 12 and the elastic contact piece 13. A large stress concentration occurs in the vicinity of the outer edge that is a boundary portion of the outer periphery and is extended by deformation.

However, according to the press-fit terminal 10 of the present embodiment, since the stress distribution portion 17 is provided in the portion where the large stress is generated, the generated stress is distributed over a wide range without being concentrated in one place as in the prior art. Therefore, the stress applied per unit area can be reduced. As a result, the press-fit terminal 10 can be prevented from cracking or being damaged.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the following description, only the configuration different from that of the first embodiment will be described. For the same configuration as that of the first embodiment, the reference numeral of 20 added to the reference numeral assigned to each configuration is used.

The press-fit terminal 30 of the present embodiment is different from the press-fit terminal 10 of the first embodiment described above in the form of the tip and the elastic contact piece.

Specifically, the press-fit terminal 30 of the present embodiment is set so that the width dimension in the front-rear direction of the pair of elastic contact pieces 33 is almost equal at any position. In other words, the inner peripheral edge of the opening 36 is set along the outer side edge of the pair of elastic contact pieces 33.

The pair of elastic contact pieces 33 includes a first inclined portion 33A that gradually protrudes rearward from the distal end side, and a contact that extends along the axial direction (front-rear direction and insertion direction) connected to the first inclined portion 33A. It is comprised from the part 33B and the 2nd inclination part 33C which continues to the contact part 33B, and is gradually diameter-reduced toward back.

Further, the distal end portion of the terminal portion 31 of this embodiment is an insertion guide portion 32. The insertion guide portion 32 includes a posture guide portion 32B extending in the axial direction (forward) from the tip of the elastic contact piece 33, and a position guide portion 32A narrowed from the tip of the posture guide portion 32B toward the front. ing.

Also in the press-fit terminal 30 of the present embodiment, the region including the boundary portion between the insertion guide portion 32 and the elastic contact piece 33, in other words, at the position corresponding to the front end of the opening portion 36 in the front-rear direction, the outer side from the side edge portion. A stress distribution portion 37 that bulges toward the protruding direction of the elastic contact piece 33 is provided. These stress distribution portions 37 also bulge out in a gentle mountain shape, in other words, in a circular arc shape in which both ends thereof are gently continuous with the insertion guide portion 32 and the elastic contact piece 33. The dimension L12 between the pair of apexes of the stress dispersion part 37 is set to be smaller than the dimension L10 between the pair of contact parts 33B of the elastic contact piece 33 in the natural state, and the press-fit terminal 30 is When inserted into the through hole 21 of the circuit board 20, it is set so as not to contact the inner wall of the through hole 21. That is, the dimension L12 between the pair of top portions of the stress dispersion portion 37 is set to be smaller than the inner diameter of the through hole 21.

Also in the present embodiment, the insertion guide portion 32, the pair of elastic contact pieces 33, the base portion 34, the stress dispersion portion 37, and the attachment portion 39 are all plate-like with the same plate thickness, and the same surface. It is arranged inside.

Also in the press-fit terminal 30 of this embodiment, the stress dispersion portion 37 is provided in a portion where a large stress is generated intensively due to the deformation at the time of insertion into the through hole 21 as in the first embodiment. Therefore, the generated stress can be dispersed over a wide range, and the stress applied per unit area can be reduced. As a result, the press-fit terminal 30 can be prevented from cracking or being damaged.

<Embodiment 3>
Next, Embodiment 3 will be described with reference to FIG. In the following description, only the configuration different from that of the first embodiment will be described. For the same configuration as that of the first embodiment, the reference numeral of 30 is added to the reference numeral assigned to each configuration.

The press-fit terminal 40 of the present embodiment is configured such that the inner stress dispersion portion 50 is provided on a press-fit terminal similar to the above-described first embodiment.

The pair of elastic contact pieces 43 of the press-fit terminal 40 of the present embodiment is set so that the width dimension in the front-rear direction of each elastic contact piece 43 is substantially equal at any position, as in the second embodiment. . That is, the inner peripheral edge portion (the side edge portion on the inner side of the elastic contact piece 43) of the opening 46 is set so as to substantially follow the outer side edge portion of the pair of elastic contact pieces 43.

The pair of elastic contact pieces 43 includes a first inclined portion 43A that gradually protrudes rearward from the distal end side, and a contact portion that extends along the axial direction (the front-rear direction and the insertion direction X) continuously to the first inclined portion 43A. 43B and a second inclined portion 43C that is continuous with the contact portion 43B and gradually decreases in diameter toward the rear. The first inclined portion 43A and the second inclined portion 43C extend in a direction intersecting with the insertion direction X of the press-fit terminal 40 into the through hole 21.

The boundary portion between the first inclined portion 43A and the contact portion 43B, that is, the rear end portion of the first inclined portion 43A, in the region where the inclination angle of the elastic contact piece 43 changes, is directed toward the inside of the opening 46. A protruding first inner stress dispersion portion 50A is provided. The first inner stress distribution portion 50A has a gentle mountain-like shape in which both ends of the first inner stress distribution portion 50A are gradually continuous from the inner peripheral edge of the opening 46 to the first inclined portion 43A and the contact portion 43B. It bulges into a shape.

Further, the boundary portion between the contact portion 43B and the second inclined portion 43C, that is, the front end portion of the second inclined portion 43C, the region where the inclination angle of the elastic contact piece 43 changes is located inside the opening 46. A second inner stress dispersion portion 50B that protrudes is provided. The second inner stress dispersion portion 50B has a gentle mountain-like shape in which both ends thereof are gradually continuous with the contact portion 43B and the second inclined portion 43C from the inner peripheral edge of the opening 46 to the inside. It bulges into a shape.

According to such a press-fit terminal 40 of this embodiment, in addition to the same stress dispersion portion 47 as that of the above-described embodiment 1, a large stress is intensively generated by being stretched by deformation at the time of insertion into the through hole 21. Inside the boundary portion (region where the inclination angle changes) between the first inclined portion 43A and the contact portion 43B, and inside the boundary portion (region where the inclination angle changes) between the contact portion 43B and the second inclination portion 43C In addition, since the inner

stress dispersion portions

50A and 50B are provided, the stress generated on the inner peripheral side of the opening 46 can be dispersed over a wide range, and the stress applied per unit area can be reduced. .

<Embodiment 4>
Next, Embodiment 4 will be described with reference to FIGS. In the following description, only the configuration different from that of the second embodiment will be described. For the same configuration as that of the second embodiment, the reference numeral of 30 is added to the reference numeral assigned to each configuration.

In the press-fit terminal 60 of the present embodiment, the press-fit terminal 30 of the second embodiment described above is provided with an elasticity applying portion 71 that applies an elastic force to the pair of elastic contact pieces 63, and the inner stress dispersion portion 70 is provided. It is the form which was provided.

Specifically, in the first inclined portion 63A of the pair of elastic contact pieces 63, the region on the distal end side is spanned by the pair of first inclined portions 63A over the entire region on the distal end side, and the two are connected. 71A of front end side elasticity provision parts which are to be performed are provided. The tip side elasticity applying portion 71A has a plate shape thinner than the plate thickness of the elastic contact piece 63, and as shown in FIG. 8, at the central portion in the plate thickness direction (height direction) of the pair of elastic contact pieces 63. It is spanned and arranged so as to have a cross-sectional H shape as a whole. Further, as shown in FIG. 7, the edge portion on the opening 66 side of the tip side elasticity applying portion 71 </ b> A is a curved surface that curves toward the outside of the opening 66, and is gently continuous with the inner peripheral edge of the opening 66. It is made into the form.

On the other hand, in the entire region of the contact portion 63B and the second inclined portion 63C of the pair of elastic contact pieces 63, the base-side elasticity applying portion 71B that spans the pair of contact portions 63B and the second inclined portion 63C and connects the whole. Is provided. The base-side elasticity applying portion 71B has a thickness equivalent to that of the tip-side elasticity applying portion 71A, that is, a plate shape thinner than the plate thickness of the elastic contact piece 63, and the thickness direction (height of the pair of elastic contact pieces 63) (See FIG. 8). The edge portion on the opening 66 side of the base-side elasticity applying portion 71B is also a curved surface that curves toward the outside of the opening 66, and is configured to be gently connected to the inner peripheral edge of the opening 66. (See FIG. 7).

In the press-fit terminal 60 of the present embodiment, the boundary portion between the distal end side elasticity applying portion 71A, the first inclined portion 63A (elastic contact piece 63), and the opening 66 bulges toward the inside of the opening 66. A first inner stress dispersion portion 70A is provided. The first inner stress dispersion portion 70A bulges in an arc shape whose both ends are gently continuous with the tip side elasticity applying portion 71A and the first inclined portion 63A (elastic contact piece 63), in other words, a gentle mountain shape. ing. 70 A of 1st inner side stress dispersion | distribution parts have thickness equivalent to 71A of front end side elasticity provision parts, and are flush with 71A of front end side elasticity provision parts in the front and back.

In addition, at the boundary between the base side elasticity applying portion 71B, the boundary between the first inclined portion 63A and the contact portion 63B (elastic contact piece 63), and the opening 66, it swells toward the inside of the opening 66. A second inner stress dispersion portion 70B is provided. The second inner stress dispersion portion 70B also bulges into an arc shape whose both ends are gently continuous with the base side elasticity applying portion 71B and the first inclined portion 63A (elastic contact piece 63), in other words, a gentle mountain shape. ing. The second inner stress dispersion portion 70B has a thickness equivalent to that of the base-side elasticity applying portion 71B, and is flush with the base-side elasticity applying portion 71B.

According to such a press-fit terminal 60 of the present embodiment, in addition to the stress dispersion portion 67 similar to that of the second embodiment, the opening portion 66 in which a large stress is intensively generated due to deformation upon insertion into the through hole 21. Since the inner stress dispersion portion 70 is provided in a specific portion on the inner peripheral side of the inner surface, the generated stress can be dispersed over a wide range, and the stress applied per unit area can be reduced.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiment described with reference to the above description and drawings, and for example, the following embodiments are also included in the technical scope.

(1) In the above embodiment, the needle eye type is used as the configuration of the examples as the press fit shape. However, the present invention is not limited to this, and various press fits such as S type, N type, H type, M type, ship type, etc. A shape may be used.

(2) In the above embodiment, the

stress dispersion portions

17, 37, 47, 67 include the boundary portions between the tip portions 12, 42 (insertion guide portions 32, 62) and the

elastic contact pieces

13, 33, 43, 63. The same stress distribution portion is provided in the region including the boundary between the

elastic contact pieces

13, 33, 43, 63 and the

base portion

14, 34, 44, 64, or both. May be.

(3) In the first, second, and fourth embodiments, the width of the

elastic contact pieces

13, 33, and 63 at the position is increased by the swelled dimension of the

stress dispersion portions

17, 37, and 67. 6, as in the third embodiment shown in FIG. 6, the inner peripheral edge portion of the opening 46 is formed along the side edge portion of the stress dispersion portion 47, and the width dimension of each elastic contact piece 43 is provided with the stress dispersion portion 47. Also, the width may be equal to that of other portions.

(4) The form of the stress distribution portion is not limited to the above embodiment, and may be any form such as a rectangular protrusion in plan view, a triangular shape, or a general arc shape.

(5) In the third embodiment, the elastic contact piece 43 includes the first inclined portion 43A, the contact portion 43B, and the second inclined portion 43C, and the boundary between the first inclined portion 43A and the contact portion 43B in the opening 46. The inner stress dispersion portion 50 is provided at the inner peripheral edge portion of the portion and the boundary portion between the contact portion 43B and the second inclined portion 43C. However, the contact portion 43B is omitted as a square-shaped elastic contact piece. It is good also as a structure which provides an inner side stress dispersion | distribution part in the boundary part (part where an inclination angle changes) of 1 inclination part and 2nd inclination part.

(6) Alternatively, the elastic contact piece may be bent three or more times, and an inner stress dispersion portion may be provided in each bent portion (a portion where the inclination angle changes).

(7) In the above-described embodiment 4, the configuration in which the elasticity applying portion 71 is arranged so as to have a cross-sectional H shape with the elastic contact piece 63 is shown, but the configuration of the elasticity applying portion is not limited to the above-described embodiment. For example, as shown in FIG. 9, it may be arranged so as to have an N-shaped cross section, or may be a piece that intermittently couples a pair of elastic contact pieces. In short, the elastic force of the elastic contact pieces is improved. Any form is acceptable.

10, 30, 40, 60: Press-

fit terminals

11, 31, 41, 61: Terminal portions 12, 42:

Tip portions

13, 33, 43, 63:

Elastic contact pieces

14, 34, 44, 64: Base portion 15:

Top portion

16, 36, 46, 66: opening

portions

17, 37, 46, 67: stress dispersion portion 18: top portion 20: circuit board 21: through hole 32, 62: insertion guide portion (tip portion)
50, 70: inner stress dispersion part 71: elasticity applying part X: insertion direction

Claims

A press-fit terminal that is inserted into a through hole provided in a circuit board and is conductively connected to the through hole in a state of elastic contact with the inner wall of the through hole,
A tip located on the tip side in the insertion direction with respect to the through hole;
A base located on the opposite side of the tip;
A pair of elastic contact pieces arranged opposite each other through the opening, positioned between the distal end portion and the base portion, connecting both and projecting outward,
Projecting in the same direction as the protruding direction of the elastic contact piece into at least one of a region including a boundary portion between the tip portion and the elastic contact piece and a region including a boundary portion between the base portion and the elastic contact piece A press-fit terminal with a stress distribution part.
The press-fit terminal according to claim 1, wherein the stress dispersion portion bulges in an arc shape toward the protruding direction.
The inner stress dispersion part which protrudes toward the inner side of the said opening part is provided in the inner peripheral part of the area | region where the inclination angle of a pair of said elastic contact piece changes among the said opening parts. Press-fit terminals as described in 1.
An elasticity applying portion is provided between the pair of elastic contact pieces to connect the pair of elastic contact pieces to give an elastic force, and a boundary portion between the elasticity applying portion, the elastic contact piece, and the opening. The press-fit terminal according to claim 1, wherein an inner stress dispersion portion that protrudes toward the inside of the opening is provided on the inner surface of the press-fit terminal.
The press-fit terminal according to claim 3 or 4, wherein the inner stress dispersion portion bulges out in an arc shape from an inner peripheral edge portion of the opening.