JP2008282671A - Terminal for circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure connection reliability on a circuit board under a high electrical current. <P>SOLUTION: A terminal 10 is generally of an elongated form and includes a mount part 12 mounted on a connector housing 60, a board connection part 13 in contact with a contact part 83 formed in a through-hole 82 in the circuit board 80 and an exposed part 14 disposed between the board connection part 13 and the mount part 12 in exposure. The exposed part 14 is provided with an unevenness forming part 23 constituted by concave parts 25 and convex parts 24 alternately formed along the length of a side edge of the exposed part 14. The heat radiating property is increased by this unevenness forming part 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a terminal attached to a circuit board.

In Patent Document 1, an elongated shape is formed as a whole, and elastically applied to a mounting portion to be mounted on a connector housing of a board connector and a contact portion that is inserted into a through hole of a circuit board and formed on the inner periphery of the through hole. There is disclosed a circuit board terminal including a board connecting portion that comes into contact with each other and an exposed portion that is exposed and disposed between the board connecting portion and the mounting portion.
JP 2006-73237 A

  By the way, there is a case where a high current is passed through the circuit board terminal as described above. In this case, if the diameter of the terminal is too small, the spring property of the board connecting portion is reduced due to heat generation, resulting in insufficient holding power to the circuit board, and connection reliability may be impaired.

  The present invention has been completed based on the above situation, and an object thereof is to ensure connection reliability to a circuit board even under a high current.

  As means for achieving the above-mentioned object, the invention of claim 1 has an elongated shape as a whole, a mounting portion to be mounted on the connector housing, and a board connecting portion that contacts a contact portion formed on the circuit board. And an exposed portion that is exposed and arranged between the substrate connecting portion and the mounting portion, and the exposed portion is uneven along a length direction of a side edge of the exposed portion. It is characterized in that it has a configuration in which an uneven portion for repeating the above is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the exposed portion is bent halfway in the length direction, and the concave portion of the concave-convex forming portion is arranged corresponding to the bent portion. It has a characteristic where it exists.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a plurality of the connector housings arranged in the width direction of the connector housing and adjacent to each other in the width direction may It is characterized in that the phase of the irregularities is shifted so that the other convex portion is arranged corresponding to one concave portion.

  According to a fourth aspect of the present invention, in the apparatus according to any one of the first to third aspects, the mounting portion includes a protrusion that bites into an inner periphery of an attachment hole formed through the back wall of the connector housing. And has a feature in that a bending space is provided in the inside thereof to enable elastic bending in the radial direction.

<Invention of Claim 1>
Since the exposed portion is provided with a concavo-convex forming portion that repeats concavo-convex along the length direction of the side edge of the exposed portion, heat can be avoided from being accumulated in the substrate connecting portion due to heat radiation from the concavo-convex forming portion, The connection reliability of the board connecting portion to the circuit board is improved.

<Invention of Claim 2>
Since the exposed portion is bent in the middle of the length direction, and the concave portion of the concavo-convex forming portion is arranged correspondingly to the bent portion, the bending portion can be smoothly bent. In addition, since the flesh that protrudes from the side edge of the bent portion with the bending operation of the bent portion fits into the concave portion of the concave-convex forming portion, the pitch between adjacent terminals can be reduced.

<Invention of Claim 3>
In the terminals adjacent to each other in the width direction, the phases of the protrusions and recesses are shifted so that the other protrusions correspond to one of the recesses and protrusions facing each other. The convex portions of the forming portion do not interfere with each other, and the pitch between adjacent terminals can be reduced.

<Invention of Claim 4>
Since the mounting portion has a protrusion that bites into the inner periphery of the mounting hole formed through the inner wall of the connector housing, and a bending space that allows elastic bending in the radial direction is provided inside the mounting portion. The area of the mounting portion can be increased by the protrusions and the inner wall of the bending space, and the heat dissipation from the mounting portion is also improved. Further, in the process of mounting on the connector housing, the mounting portion is elastically bent into the bending space, so that it is possible to prevent the inner periphery of the mounting hole from being scraped off by the protrusion.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The circuit board terminal of the present embodiment (hereinafter simply referred to as the terminal 10) is also referred to as a press-fit terminal, is made of a conductive metal plate, and has an elongated rectangular bar shape as a whole.

  As shown in FIG. 1, the terminal 10 is mounted by press-fitting into a connector housing 60 of a board connector. The connector housing 60 is made of a synthetic resin and includes a cylindrical hood portion 61, and an attachment hole 63 of the terminal 10 is formed in the back wall 62 of the hood portion 61 so as to penetrate in the thickness direction (front-rear direction). The mounting holes 63 are arranged in a plurality of levels in the upper and lower stages 62 in the rear wall 62 of the hood portion 61 and in the width direction, and the terminals 10 can be inserted into the mounting holes 63 from the rear. Specifically, as shown in FIG. 4, the attachment hole 63 includes an insertion port 64 that is opened in a trumpet shape on the rear surface of the connector housing 60, and a press-fit path 65 that extends forward in a stepped manner at the front end of the insertion port 64. And a protrusion 19 (described later) of the terminal 10 is pressed against the inner surface of the press-fitting path 65 in a biting state. Further, positioning protrusions 66 are formed so as to protrude downward at both ends in the width direction of the rear surface of the connector housing 60, and the tip of the positioning protrusion 66 is positioned below the tip of the terminal 10, so that the terminal Prior to 10, the positioning projection 66 is inserted into the corresponding positioning hole 81 of the circuit board 80 (printed circuit board) in a positioned state.

  The terminal 10 includes a tab-shaped terminal connecting portion 11 that protrudes into the hood portion 61, and a mounting portion 12 that is connected to the rear wall 62 of the hood portion 61 by press fitting and is connected to the rear of the terminal connecting portion 11. , Located at the end opposite to the terminal connection portion 11, is press-fitted into the through hole 82 of the circuit board 80, and is in electrical contact with the contact portion 83 formed by plating or the like formed on the inner periphery of the through hole 82. And a substrate connecting portion 13 and an exposed portion 14 disposed between the substrate connecting portion 13 and the mounting portion 12 so as to be exposed to the outside air. A bent portion 15 is provided in the middle of the exposed portion 14, and the front side and the rear side with the bent portion 15 as a boundary are connected substantially at right angles, so that the terminal 10 as a whole has an L shape.

  As shown in FIG. 2, the board connecting portion 13 includes a pair of left and right elastic contact portions 17 that bulge outwardly with a through hole 16 extending in a slit shape in the vertical direction. The two elastic contact portions 17 are arranged to be opposed to each other in a cantilevered manner, and are elastically deformed so as to close inward in the radial direction in the insertion process into the through hole 82. A shoulder 18 that can be pressed by a jig or the like when inserted into the through hole 82 is formed on the board connecting portion 13 above the elastic contact portion 17 so as to protrude from the left and right.

  Further, as shown in FIG. 4, a plurality of projections 19 having a sawtooth shape along the length direction (axial direction) are provided on both side edges of the mounting portion 12. It is possible to bite into the inner surface of the press-fit path 65. The mounting portion 12 has a bending space 21 extending in a slit shape in the vertical direction, and a protrusion 19 is juxtaposed with a belt-like portion that bulges outside with the bending space 21 interposed therebetween. Further, on both side edges of the mounting portion 12, on the rear side of the protrusion 19, a jig abutting protrusion 22 that is accommodated in the insertion port 64 in the mounted state is formed to project to the left and right.

  Now, as shown in FIGS. 2 and 3, the exposed portion 14 is repeatedly uneven along the length direction of both side edges of the exposed portion 14, thereby increasing the creepage length of both side edges of the exposed portion 14. In addition, a concavo-convex forming portion 23 is provided in which the dimension in the width direction (the side-by-side direction of the terminals 10) is larger than that of the substrate connecting portion 13 and the terminal connecting portion 11. Specifically, the concavo-convex forming part 23 includes a substantially square convex part 24 projecting outward on both sides and a substantially square concave part 25 arranged between the convex parts 24 arranged in the length direction. The convex portions 24 and the concave portions 25 have the same shape and the same size, and the convex portions 24 and the concave portions 25 that face each other in the width direction are arranged at the same position in the length direction and have a bilaterally symmetric shape. The concave portion 25 is configured to have a size (length) about twice that of the convex portion 24 in the length direction, and the distance between the bottom surfaces of the concave portions 25 facing each other in the width direction is the distance between the mounting portion 12 and the substrate connecting portion 13. Greater than full width. Further, when the terminal 10 is bent, the bent portion 15 is formed by being bent at a right angle with the recess 25 as a boundary.

  By the way, as the terminal 10 in this embodiment, three types of terminals 10 are prepared for each step of the mounting hole 63, and further, as shown in FIG. Terminal 10 (first terminal 10A and second terminal 10B) are prepared. The first terminals 10 </ b> A and the second terminals 10 </ b> B are in a positional relationship adjacent to each other in the mounted state, and are arranged alternately along the width direction of the connector housing 60. The first terminal 10 </ b> A is located closer to the mounting portion 12 and is slightly wider than the terminal connection portion 11 between the convex portion 24 and the protruding piece 22 closest to the mounting portion 12, and the distance between the bottom surfaces of the concave portions 25. It has a constricted portion 26 that is narrower than (the minimum width dimension of the unevenness forming portion 23). The first terminal 10 </ b> A is provided with a recess 25 </ b> A having the same length as the other recesses 25 between the protrusion 24 and the shoulder 18 that are close to the substrate connection 13 and are closest to the substrate connection 13. And all the concave portions 25 and the convex portions 24 are set to be repeated at the same pitch. The shoulder portion 18 of the first terminal 10 </ b> A is narrower than the convex portion 24 (the projection amount is small), but can be equated with the convex portion 24.

  On the other hand, the second terminal 10B repeats irregularities at the same pitch in the length direction as the first terminal 10A, but has a constricted portion 26 having a shorter length than the first terminal 10A, and the substrate of the recess 25 is a substrate. The length of the recess 25 </ b> B closest to the connection portion 13 is set to be shorter than the lengths of the other recesses 25. In the first terminal 10A and the second terminal 10B that are adjacent to each other, the convex portion 24 of the second terminal 10B is adjacent to the concave portion 25 of the first terminal 10A, and the concave portion 25 of the second terminal 10B has a first portion. The convex portion 24 of the terminal 10A is adjacently positioned correspondingly. That is, in the mounted state, the phase of the concavo-convex portion of the concavo-convex forming portion 23 is shifted by ½ cycle between the first terminal 10A and the second terminal 10B adjacent to each other. Further, in the first terminal 10A and the second terminal 10B adjacent to each other, as shown in FIG. 2, the protruding end of the protruding portion 24 of the second terminal 10B and the protruding end of the protruding portion 24 of the first terminal 10A are in the width direction. Almost the same position.

Next, the function and effect of this embodiment will be described.
First, the terminal 10 is mounted on the connector housing 60. In the process of inserting the terminal 10 into the mounting hole 63 of the connector housing 60, the projection 19 of the mounting portion 12 is in sliding contact with the inner surface of the press-fitting path 65 of the mounting hole 63, and the entire mounting portion 12 is bent toward the space 21 (radial direction). The terminal 10 is held by the connector housing 60 so that the projection 19 of the mounting portion 12 bites into the inner surface of the press-fitting path 65 of the mounting hole 63 when the insertion is completed. 4 and FIG. When the terminals 10 are inserted into all the mounting holes 63, the first terminals 10A and the second terminals 10B are alternately positioned in the width direction while arranging the first terminals 10A at both ends in the width direction of the connector housing 60. The terminals 10 adjacent in the direction are pinched at a narrow pitch (see FIGS. 2 and 3).

  Subsequently, the connector housing 60 is mounted on the circuit board 80. When the terminal 10 is inserted into the corresponding through hole 82 of the circuit board 80 from above at a normal depth, the both elastic contact portions 17 are elastically pressed against the inner periphery of the through hole 82. As a result, the terminal 10 is held from the through hole 82 in a state in which the terminal 10 is prevented from coming off, and is electrically connected to the contact portion 83 formed on the inner periphery of the through hole 82 (see FIG. 1). In this state, when the mating female connector housing is inserted into the hood portion 61 of the connector housing 60 from the front, the terminal connecting portion 11 of the terminal 10 is fitted into the mating female terminal fitting attached to the female connector housing. Thus, electrical connection is established between the terminal 10 and the female terminal fitting.

  By the way, when the above-mentioned board connector is used in a circuit through which a high current flows, the amount of heat generated by the terminal 10 becomes relatively large. There is a concern that the contact state between the connecting portion 13 and the circuit board 80 may become unstable. However, according to the present embodiment, the exposed portion 14 is provided with the concavo-convex forming portion 23 in which the concave portion 25 and the convex portion 24 are repeatedly formed, so that the creepage length at the side edge of the exposed portion 14 is longer than the conventional one. Heat dissipation. As a result, it is possible to avoid heat from being accumulated in the board connecting portion 13 of the terminal 10, and the connection reliability of the board connecting portion 13 to the circuit board 80 is improved.

  In addition, since the concave portion 25 of the concavo-convex forming portion 23 is disposed corresponding to the bent portion 15 of the exposed portion 14, the bending operation of the bent portion 15 can be performed smoothly. At this time, the flesh that protrudes from the side edge of the bent portion 15 along with the bending operation of the bent portion 15 is accommodated in the concave portion 25, so that the width dimension of the exposed portion 14 does not increase. Can pack the pitch.

  Further, in the terminals 10 adjacent in the width direction, the convex portion 24 of the second terminal 10B corresponds to the concave portion 25 of the first terminal 10A, and the concave portion 25 of the second terminal 10B corresponds to the convex portion 24 of the first terminal 10A. As described above, since the phase of the concave and convex portions of the concave and convex portion 23 is shifted, the convex portions 24 of the concave and convex portions 23 adjacent in the width direction do not interfere with each other, and the pitch between the adjacent terminals 10 is further reduced. Can do.

Further, the mounting portion 12 has a projection 19 that bites into the inner periphery of the mounting hole 63 formed through the back wall 62 of the hood portion 61, and a deflection that enables elastic deflection in the radial direction inside thereof. Since the space 21 is provided, the surface area of the mounting portion 12 can be increased by the protrusions 19 and the inner wall of the bending space 21, and heat dissipation from the mounting portion 12 is also improved.
Furthermore, in the process of mounting to the connector housing 60, the mounting portion 12 is elastically bent radially inward toward the bending space 21, so that the inner periphery of the mounting hole 63 can be prevented from being scraped by the protrusion 19.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The terminals may be mounted in a staggered arrangement on the rear surface of the connector housing. Thereby, it can set so that it can avoid that the recessed part and convex part between the terminals which mutually adjoin in the width direction interfere.
(2) The terminal may be inserted into the through hole of the circuit board and fixed by soldering, or may be mounted on the surface of the circuit board and fixed by soldering.
(3) The terminal may be formed linearly as a whole without having a bent portion.
(4) Between the terminals adjacent to each other, the concave portion (convex portion) of the first terminal and the convex portion (concave portion) of the second terminal facing each other may be configured to have a positional relationship overlapping in the length direction.
(5) The terminal may be formed without distinction between the first terminal and the second terminal.
(6) The terminal may have a configuration in which a concavo-convex forming portion that repeats concavo-convex is provided only on one side edge.
(7) The concave portion and the convex portion are arbitrary shapes, and may be curved wave shapes, for example.

Sectional drawing which shows the state in which the terminal was assembled | attached to the connector housing and the circuit board in Embodiment 1. Rear view showing the terminal assembled in the connector housing Partially broken bottom view showing the terminal assembled to the connector housing An enlarged sectional view showing a state immediately before the terminal connection portion is inserted into the mounting hole. Enlarged sectional view showing the state where the terminal connection part is properly inserted into the mounting hole The top view which shows the state before the bending of the 1st terminal and the 2nd terminal

Explanation of symbols

10 ... Terminal (circuit board terminal)
DESCRIPTION OF SYMBOLS 10A ... 1st terminal 10B ... 2nd terminal 11 ... Terminal connection part 12 ... Mounting part 13 ... Board | substrate connection part 14 ... Exposed part 23 ... Unevenness formation part 24 ... Convex part 25 ... Concave part 60 ... Connector housing 80 ... Circuit board 82 ... Through hole

Claims (4)

It has an elongated shape as a whole,
A mounting portion to be mounted on the connector housing;
A board connecting part that contacts a contact part formed on the circuit board;
An exposed portion disposed so as to be exposed between the substrate connecting portion and the mounting portion;
The circuit board terminal according to claim 1, wherein the exposed portion is provided with an unevenness forming portion that repeats unevenness along a length direction of a side edge of the exposed portion.   2. The circuit board terminal according to claim 1, wherein the exposed portion is bent in the middle of the length direction, and the concave portion of the concave-convex forming portion is arranged corresponding to the bent portion. .   A plurality of protrusions are arranged in the width direction of the connector housing, and those adjacent to each other in the width direction are arranged so that the other convex portion is arranged corresponding to one concave portion of the concave-convex forming portions facing each other. The circuit board terminal according to claim 1, wherein the phase of the circuit board is shifted.   The mounting portion has a protrusion that bites into the inner periphery of a mounting hole formed through the back wall of the connector housing, and a bending space that enables elastic bending in the radial direction is provided inside the mounting portion. 4. The circuit board terminal according to claim 1, wherein the circuit board terminal is provided.

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