JP2017004731A - Press-fit terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a press-fit terminal which maintains an excellent contact state in an insertion state without causing damage when a through-hole is inserted.SOLUTION: A press-fit terminal includes: a conductive part 11 of a straight portion exceeding a hole length D of a through-hole 2; and an energization part 12 which protrudes from the conductive part 11 and abuts on a region different from the region with which the conductive part 11 of the internal surface 2s of the through-hole 2 comes into contact. The energization part 12 is deformed in a state inserted into the through-hole 2, and the rigidity of the conductive part 11 is set higher as compared with that of the energization part 12 so that the conductive part 11 is not bent.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a press-fit terminal that reaches a conductive state with an inner surface of a through hole by being inserted into the through hole.

  As a press-fit terminal, Patent Document 1 describes a technology of a terminal (a compliant pin in the literature) in which a pair of flexible beams are formed so as to bulge outward while forming a vertically long opening in the center. ing.

  In this technique, with the terminal inserted into the through hole, the bendable beam is elastically deformed to come into contact with the inner surface of the through hole, thereby creating an electrically conductive state. In particular, this technique is configured to suppress damage to the inner surface of the through hole by optimizing the beam thickness and the opening of the terminal with respect to the diameter of the through hole.

  Further, as a press-fit terminal, Patent Document 2 discloses a single introduction portion that is tapered, a pair of elastic portions that surround a punched hole at an intermediate position, and a claw portion that is formed to protrude from an outer surface portion of the elastic portion. The technology provided is shown.

  In this technique, the elastic portion is elastically deformed and contacts the inner surface of the through hole in the state in which the terminal is inserted into the through hole, similarly to Patent Document 1 described above, thereby creating an electrically conductive state. ing. In particular, the claw portion prevents movement in the direction opposite to the insertion direction with the terminal inserted into the through hole.

  In addition, as a technique similar to a press-fit terminal, Patent Document 3 discloses that a metal terminal is formed by bending a linear metal material into a U shape and inserting it into an elongated through hole. A technique for creating a conductive state by bringing a pair of linear portions constituting a surface into contact with the inner surface of a through hole is shown.

  In this technique, the pair of linear portions of the metal terminal are configured to contact the inner surface of the through hole in a state of being inserted into the through hole.

JP 2009-21238 A Japanese Patent No. 4492799 Japanese Patent Laid-Open No. 7-106005

  It is desirable that the press-fit terminal is pressure-bonded with a contact surface where the outer surface of the terminal is wide with respect to the inner surface of the through-hole while being inserted into the through-hole.

  On the other hand, in the configurations of Patent Document 1 and Patent Document 2, when the terminal is inserted into the through hole, the portion of the terminal that protrudes most outward is in contact with the inner surface of the through hole (for example, In Document 1, it is elastically deformed (to the opening side). In such a contact form, since the pressure acting between the terminal and the inner surface of the through hole is increased and the frictional force is also increased, it is considered that the inner surface of the through hole and the outer surface of the terminal are damaged. In Patent Document 1, damage is suppressed by optimizing the dimensional relationship, but damage is inevitable in principle.

  In the configuration of Patent Document 2, the outer surface of the terminal and the inner surface of the through hole come into contact with each other in a straight region after the insertion is completed, but the outer end portion of the claw portion strongly contacts the inner surface of the through hole during the insertion operation. As a result, the inner surface of the through hole was easily damaged.

  In Patent Document 3, the outer surface of the terminal and the inner surface of the through hole are in contact with each other in a linear region in the inserted state. However, since the metal material is bent in a U shape, the tip portion of the terminal is the inner surface of the through hole. There is an inconvenience that the contact pressure decreases as the position becomes farther from the tip and away from the tip.

  In addition, press-fit terminals are subject to repeated thermal expansion and contraction with changes in temperature, and external vibrations that cause minute wear between the terminals and the inner surface of the through-holes. It was also considered that it would cause inconvenience that would increase the resistance.

  That is, in such a press-fit terminal, there is a demand for a configuration that does not cause damage when inserted into a through hole and that maintains a good conductive state in the inserted state.

A feature of the present invention is that a conductive portion having a linear portion having a dimension exceeding the hole length of the through hole formed in the substrate;
A biasing portion that protrudes from the conducting portion and abuts against a region different from a region in contact with the conducting portion of the inner surface of the through hole;
The biasing portion is higher in rigidity than the conduction portion.

According to this configuration, when a press-fit terminal is inserted into the through hole, the biasing portion is in contact with the inner surface of the through hole, and the linear portion of the conductive portion is in contact with the inner surface of the through hole. Operation becomes possible. In addition, since the rigidity of the conducting part is higher than the rigidity of the biasing part, the conducting part is not bent and deformed after insertion, and the inner surface of the through hole and the conducting part can be maintained in a good contact state. .
Therefore, when inserted into the through hole, a press-fit terminal is constructed in which neither the terminal nor the through hole is damaged, and a good conduction state is maintained in the inserted state.

  In the present invention, a length along a longitudinal direction of the conducting portion of a first abutting surface that is formed in the linear portion and abuts on an inner surface of the through hole is formed in the biasing portion, and the through hole The length of the second contact surface that contacts the inner surface may be longer than the length along the longitudinal direction.

  According to this, the first contact surface contacts the inner surface of the through hole with a length corresponding to the entire length of the through hole, and the second contact surface contacts the inner surface of the through hole. The contact is made with a length shorter than the length. Therefore, the contact pressure at the second contact surface is increased to facilitate elastic deformation of the urging portion, and the contact pressure is averaged at the first contact surface to maintain a good contact state. Is possible.

In the present invention, the biasing portion connects different base end portions along the longitudinal direction of the conducting portion in the conducting portion,
Each end portion of the linear portion may extend outward from a base end portion of the urging portion corresponding to the longitudinal direction of the conducting portion.

  According to this, it becomes possible to form an urging portion in a bridge shape in a part of the linear conducting portion, and the most projecting region of the urging portion is brought into contact with the inner surface of the through hole. Can be easily elastically deformed and act on the conducting portion. In addition, since the straight portion of the conducting portion is formed outwardly with respect to the position where the base end portion of the urging portion is connected to the conducting portion, the urging force of the urging portion is reliably ensured by the conducting portion. It is transmitted to the straight line part. Any region of the linear portion of the conducting portion may come into contact with the inner peripheral surface of the through hole. Therefore, the urging force by the urging unit needs to be reliably transmitted to all the regions of the linear portion. The urging force applied to the conducting portion from the base end portion of the urging portion reaches the first contact surface while spreading along the longitudinal direction of the conducting portion. Therefore, in this configuration, the positions of both end portions of the linear portion are formed outside the two base end portions of the urging portion so that the entire region where the urging force is transmitted becomes the linear portion.

According to the present invention, the urging portion includes a plate-like portion that is formed to protrude in a predetermined region along the longitudinal direction of the conducting portion in the conducting portion, and abuts against the inner peripheral surface of the through hole. Part is provided at the peripheral edge of the plate-like part,
When the abutting portion comes into contact with the inner peripheral surface, the plate-like portion may be deformed out of plane to generate an urging force.

  By configuring the urging portion with a plate-like portion along the longitudinal direction of the conducting portion as in this configuration, an equal urging force is easily transmitted to all regions of the straight line portion. The plate-like portion inserted into the through hole bends and deforms with out-of-plane deformation, but the plate-like portion is connected to the conducting portion over the entire length. Therefore, the straight portion is urged linearly by the plate-like portion, the contact state between the straight portion and the inner peripheral surface of the through hole is homogenized, and a stable conduction state can be obtained.

It is a through hole, a press fit terminal, and sectional drawing. It is the II-II sectional view taken on the line of FIG. It is a perspective view of a press fit terminal. It is a perspective view of a board | substrate and a press fit terminal. It is a through hole of another embodiment (a), a press fit terminal, and a sectional view. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIGS. 1 to 4, a press-fit terminal 10 is configured to reach a conductive state with a printed wiring or the like of the substrate 1 by being inserted into a through hole 2 formed in a through hole shape with respect to the substrate 1. .

  The substrate 1 has a printed wiring 3 formed of a metal foil of a good conductor such as copper on the surface of an insulating plate material such as glass epoxy. The through hole 2 has an inner surface 2s plated with a metal film of a good conductor over its entire inner peripheral surface, and the metal film on the inner surface 2s is electrically connected to a predetermined printed wiring 3.

  When the press-fit terminal 10 is inserted into the through-hole 2, the press-fit terminal 10 is elastically brought into contact with the inner surface 2s of the through-hole 2 to create a conductive state. By being inserted in this way, it is possible to apply a voltage to the printed wiring 3 through the press-fit terminal 10 and to transmit a signal to the printed wiring 3 through the press-fit terminal 10.

[Specific configuration]
In the press-fit terminal 10, a linear conductive portion 11 and a biasing portion 12 projecting outward from the conductive portion 11 are integrally formed of a copper alloy. Although it is possible to use the press-fit terminal 10 without performing surface treatment, it is desirable to form a conductor film such as gold plating on the surface.

  As shown in FIG. 1, the conducting portion 11 is a rod-like shape formed linearly with a total length L exceeding the hole length D in the depth direction of the through hole 2 (the length of the hole in the depth direction). A tapered guide surface 11 a is formed at the tip of the portion 11. In this conducting portion 11, a rod-like region excluding the guide surface 11a is a straight portion. The conducting portion 11 has a circular arc cross section so as to abut against the inner surface 2 s of the through hole 2, and a first abutting surface 11 s extending in the longitudinal direction of the conducting portion 11 is formed.

  The through hole 2 is formed up to a region where the good conductor constituting the inner surface 2s slightly protrudes from the opening edge, and the hole length D is a value that matches the distance in the depth direction of the good conductor formed in the through hole 2. Which is slightly larger than the thickness of the substrate 1.

  The urging portion 12 includes an abutting portion 12A made of a beam-like member that connects two base end portions 12B different in the longitudinal direction of the conducting portion 11 in a bridge shape. That is, in the insertion state shown in FIG. 1, the base end portion 12B is connected to the conduction portion 11 at two support points P exposed to the outside from the through hole 2, and a beam-like member is formed in a bridge shape. Thus, the urging portion 12 protrudes outward from the conducting portion 11. Furthermore, the linear part of the conduction | electrical_connection part 11 is formed over the area | region extended outside both the base end parts 12B on both sides of the urging | biasing part 12. As shown in FIG.

  The base end portion 12 </ b> B can be regarded as a configuration connected to the conduction portion 11. For this reason, the support point P at the center position of the connecting surface will be described as a reference for the positional relationship of the base end portion 12B.

  As described above, the beam-shaped member constituting the urging portion 12 is formed in a bridge shape, so that a half-moon-shaped opening 13 is formed between the urging portion 12 and the conduction portion 11. . In addition, the contact portion 12A is formed with a second contact surface 12s having a circular cross section so as to contact the inner surface 2s of the through hole 2.

  In particular, in the press-fit terminal 10, as shown in FIG. 2, although the member thickness T of the conductive portion 11 and the biasing portion 12 is set equal, the conductive portion width W of the conductive portion 11 is different from that of the biasing portion 12. It is set to a value that is sufficiently larger than the width of the beam-shaped member that constitutes it. Thereby, the rigidity of the conduction part 11 is set higher than the rigidity of the biasing part 12.

  When a beam-like member is considered as the urging portion 12, the thickness of the portion of the beam-like member that protrudes outward most in the contact portion 12A is the smallest, and the portion closer to both ends is formed thicker. That is, the urging portion width X in the contact portion 12A at the center position is set to a value that is significantly smaller than the conduction portion width W. Moreover, although the width | variety of the urging | biasing part 12 becomes large as the site | part close | similar to the base end part 12B, this width | variety is also set smaller than the conduction | electrical_connection part width W. FIG.

  As described above, since the linear portion of the conductive portion 11 is formed over a region extending outside both the base end portions 12B with the biasing portion 12 interposed therebetween, the interval S between the two support points P is The distance S exceeds the hole length D of the through hole 2, and the interval S is set to a value shorter than the total length L of the conductive portion 11.

[Insert operation]
In this press-fit terminal 10, a tapered guide surface 11 a is formed at the distal end of the conducting portion 11, and the base end portion 12 </ b> B of the urging portion 12 is formed in a posture that is inclined with respect to the conducting portion 11 at a subsequent position. The

  Therefore, when the press-fit terminal 10 is inserted into the through hole 2, it is possible to insert and push the leading end portion of the conduction portion 11 into the through hole 2. By continuing this insertion operation, the base end portion 12B of the urging portion 12 abuts on the inner surface 2s of the through hole 2, and the abutting portion 12A of the urging portion 12 contacts the inner surface 2s of the through hole 2 by smooth movement. It reaches a state where it abuts and elastically deforms.

  In a state where the contact portion 12A is in contact with the inner surface 2s of the through hole 2, the first contact surface 11s of the conducting portion 11 is in contact with the opposite side of the inner surface 2s from the region where the contact portion 12A is in contact. . In particular, since the conduction portion 11 has higher rigidity than the biasing portion 12, the conduction portion 11 hardly deforms and the biasing portion 12 easily elastically deforms.

  In this configuration, the length (length along the longitudinal direction of the conductive portion 11) where the first contact surface 11 s of the conductive portion 11 contacts the inner surface 2 s of the through hole 2 coincides with the hole length D. Further, the hole length D is longer than the length (the length along the longitudinal direction of the second contact surface 12 s) where the second contact surface 12 s of the urging portion 12 contacts the inner surface 2 s of the through hole 2.

  When the insertion operation of the press-fit terminal 10 is continued, the first contact surface 11 s of the conductive portion 11 formed in a straight line moves linearly along the inner surface 2 s of the through hole 2. Since each of these moves linearly during this movement, the contact state between the inner surface 2s of the through hole 2 and the first contact surface 11s of the conducting portion 11 does not change, and the pressure increases locally. In addition, the contact pressure does not become uneven.

  Further, since the first contact surface 11s of the conduction portion 11 and the second contact surface 12s of the urging portion 12 are in contact with the inner surface 2s of the through hole 2 on a wide surface, the first contact surface 11s acts between them. The pressure is reduced, and the inner surface 2s, the first contact surface 11s, or the second contact surface 12s is not damaged.

  When the set position shown in FIG. 1 is reached by this insertion operation, the contact portion 12A of the urging portion 12 reaches the center in the direction of the hole length D of the through hole 2, and the two support points P are formed. The position reaches the through hole 2. In such a positional relationship, a uniform pressure is applied in the longitudinal direction of the conduction portion 11, and the first contact surface 11 s of the conduction portion 11 is brought into contact with the inner surface 2 s of the through hole 2 to maintain a good conduction state. It will be.

  In particular, in this configuration, the state in which the first contact surface 11s of the conduction part 11 and the inner surface 2s of the through hole 2 are in close contact with each other is maintained in a well-balanced state, so that the stress of thermal expansion acts, Even if external vibrations may act, the gas tight surface is maintained in a wide area, and a good conduction state is maintained.

[Another embodiment]
In addition to the above-described embodiment, the present invention may be configured as follows (the configuration common to the embodiment in the following other embodiments is denoted by the same reference numeral as the embodiment).

(A) As shown in FIG. 5 and FIG. 6, the urging portion 12 is brought into contact with the plate-like portion 12 </ b> C connected to the conduction portion 11 in the entire region connecting the two support points P and the inner surface 2 s of the through hole 2. It is comprised with the contact part 12A formed in the peripheral part of 12 C of plate-shaped parts so that it may contact | connect. Also in this configuration, as in the embodiment, support points P are formed at two locations exposed to the outside from the through hole 2, and a contact portion 12 </ b> A is formed at the most protruding position of the biasing portion 12. A base end portion 12B is formed at the end.

  In this configuration, the urging portion 12 is integrally formed with the conduction portion 11 so as to rise from one end in the thickness direction of the conduction portion 11 (the direction of the member thickness T). By setting the thickness of 12C to a value smaller than the member thickness T of the conducting portion 11, the out-of-plane deformation at the urging portion 12 can be easily performed.

  Even in such a configuration, the first contact surface 11s of the conductive portion 11 can be satisfactorily brought into contact with the inner surface 2s of the through hole 2 similarly to the press-fit terminal 10 described in the embodiment, and the conductive state can be maintained. .

(B) In the embodiment, as shown in FIG. 2, the member thickness T of the conducting portion 11 and the biasing portion 12 is set equal. However, instead of this configuration, the member thickness T of the biasing portion 12 is reduced. May be. By setting the thickness in this way, the rigidity of the urging portion 12 can be made smaller than that of the conducting portion 11, and the deformation of the conducting portion 11 in the bending direction can be more effectively suppressed. Moreover, you may make still thinner than the plate-shaped part 12C shown by FIG. 6, and the thickness shown to the figure.

(C) As the shape of the urging portion 12, the second abutting surface 12s of the abutting portion 12A is formed in a posture parallel to the conducting portion 11, for example, the shape of the urging portion 12 is trapezoidal in a side view. You may form in. By setting the shape of the urging portion 12 in this way, the second contact surface 12s of the contact portion 12A is in close contact with the inner surface 2s of the through hole 2 in the inserted state through a wide surface. Can be maintained stably.

  The shape of the urging portion 12 is not limited to a trapezoidal shape, and the shape of the contact portion 12A is formed in a wave shape in a side view so that a plurality of second contact surfaces 12s are formed on the contact portion 12A. You may do it.

  The present invention can be used for a press-fit terminal that reaches a conductive state by being inserted into a through hole.

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Through-hole 2s Inner surface 11 Conducting part 11a 1st contact surface 12 Energizing part 12A Contact part 12B Base end part 12C Plate-shaped part 12s 2nd contact surface D Hole length

Claims (4)

A conductive portion having a linear portion with a dimension exceeding the hole length of the through hole formed in the substrate;
A biasing portion that protrudes from the conducting portion and abuts against a region different from a region in contact with the conducting portion of the inner surface of the through hole;
A press-fit terminal in which the biasing portion has higher rigidity than the conduction portion.   A length along the longitudinal direction of the conducting portion of the first contact surface that is formed in the straight portion and contacts the inner surface of the through hole is formed in the biasing portion and contacts the inner surface of the through hole. The press-fit terminal according to claim 1, wherein the length of the second contact surface is longer than the length along the longitudinal direction. The biasing portion connects different base end portions along the longitudinal direction of the conducting portion in the conducting portion,
3. The press-fit terminal according to claim 1, wherein each end portion of the linear portion extends outward from a base end portion of the urging portion corresponding to the longitudinal direction of the conducting portion. The urging portion includes a plate-like portion that is formed to project in a predetermined region along the longitudinal direction of the conducting portion in the conducting portion, and the abutting portion that abuts on the inner peripheral surface of the through-hole. In preparation for the periphery of the
3. The press-fit terminal according to claim 1, wherein an urging force is generated when the plate-like portion is deformed out of plane when the abutting portion abuts on the inner peripheral surface.

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