JP2016012476A - Printed board with press-fit terminals - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board with press-fit terminals having a novel structure in which the pitch in an arrangement direction of plural press-fit terminals mounted on a printed board can be set to a small value.SOLUTION: In a printed board with press-fit terminals in which plural press-fit terminals 14 are secured to a printed board, plural through-holes 22 are linearly aligned with one another on the plane of the printed board 12, and a larger number of through-holes 22 are arranged in an alignment direction than through-holes 22 arranged in a direction perpendicular to the alignment direction. A pair of protrusion portions 38, 38 which protrude outwards in the direction perpendicular to the length direction of the press-fit terminal 14 are formed to be nearer to the center in the length direction than a board press-in portion 30 in the press-fit terminal 14. The pair of protrusion portions 38, 38 protrude in the direction perpendicular to the alignment direction of the through-holes 22 under a mount state that the board press-in portion 30 is press-fitted in the through-hole 22.

Description

  The present invention relates to a printed circuit board with a press-fit terminal in which a press-fit terminal is mounted on the printed circuit board by press-fitting into a through hole formed in the printed circuit board.

  Conventionally, a printed circuit board with a press-fit terminal in which a press-fit terminal is mounted on a printed circuit board is known. Examples of printed circuit boards with press-fit terminals are disclosed in Japanese Patent Application Laid-Open No. 2007-311092 (Patent Document 1), Japanese Patent Application Laid-Open No. 2007-242558 (Patent Document 2), Japanese Patent Application Laid-Open No. 2005-322556 (Patent Document 3), and the like. As shown, the board press-fitting part provided at one end of the press-fit terminal having a longitudinal shape is press-fitted into a through hole of a printed board formed by forming a printed wiring on the insulating board, and the board press-fitting part A press-fit terminal is connected and held on a printed circuit board by elasticity. The press-fit terminal is held in an electrically connected state with respect to the printed wiring by press-fitting the board press-fit portion to the conductor on the inner peripheral surface of the through hole that is electrically connected to the printed wiring.

  By the way, a press-fit terminal has a pair of tensions protruding sideways for the purpose of applying pressure by bringing a jig into contact with the through-hole when pressing into the through-hole, or setting the amount of press-fitting into the through-hole appropriately. The protruding portion is formed on the center side in the length direction from the substrate press-fitting portion. This overhanging part protrudes on both sides in one direction orthogonal to the length direction of the press-fit terminal, and as shown in Patent Document 1, a plurality of press-fit terminals are aligned in the protruding direction of the overhanging part. Mounted on the printed circuit board.

  However, when a plurality of press-fit terminals are mounted on a printed circuit board so as to be aligned in the protruding direction of the overhanging portion, it is necessary to set a large pitch in the alignment direction of the press-fit terminals in order to prevent contact between the overhanging portions. Arise. As a result, there is a problem that it is difficult to reduce the size of a connector composed of the plurality of press-fit terminals.

JP 2007-311092 A JP 2007-242558 A JP 2005-322556 A

  The present invention has been made in the background of the above-described circumstances, and a solution to the problem is a novel that can set a small pitch in the alignment direction of a plurality of press-fit terminals mounted on a printed circuit board. The object is to provide a printed circuit board with a press-fit terminal having a structure.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, according to the first aspect of the present invention, a plurality of through holes are formed through a printed circuit board in which a printed wiring is formed on an insulating substrate, and a conductor formed on the inner peripheral surface of the through hole is the printed wiring. A board press-fit portion provided at one end of a press-fit terminal having a longitudinal shape is inserted into the through hole, and the board press-fit portion is elastically pressed against the conductor. In the printed circuit board with press-fit terminals in which the press-fit terminals are fixed to the printed circuit board, a plurality of the through holes are arranged linearly on a plane of the printed circuit board, and the through holes Are arranged in the alignment direction more than the direction orthogonal to the alignment direction, and the substrate in the press-fit terminal A pair of projecting portions projecting toward both outer sides perpendicular to the length direction of the press-fit terminal are formed on the center side in the length direction from the insertion portion, and the substrate press-fitting portion is formed in the through hole. A pair of the projecting portions protrudes in a direction orthogonal to the alignment direction of the through holes in the inserted state.

  According to the press-fit terminal-equipped printed circuit board having the structure according to the first aspect as described above, when the press-fit terminal is press-fitted into the through hole, the pressure-receiving surface pressed by the jig or the land contacting the land portion in the mounted state An overhanging part constituting a contact surface or the like protrudes in a direction perpendicular to the alignment direction of the through holes. Therefore, in the alignment direction of the through holes where more press-fit terminals are arranged, it is not necessary to secure the protruding space of the protruding portion, and a plurality of press-fit terminals are arranged at a narrow interval (pitch). Can do. Accordingly, it is possible to reduce the size of a connector composed of a plurality of press-fit terminals arranged in alignment.

  In particular, since the distance between the terminals can be set small in the direction in which more press-fit terminals are arranged, the space for arranging the press-fit terminals can be more effectively reduced by narrowing the pitch. .

  According to a second aspect of the present invention, in the printed board with a press-fit terminal described in the first aspect, the press-fit terminal is formed of a metal square wire having a plating layer on the surface.

  According to the second aspect, the plating layer is formed on the surface of the press-fit terminal without requiring a special plating step after forming the overhang portion or the substrate press-fitting portion by the plating layer formed on the surface of the metal square wire. Therefore, excellent conductivity can be obtained with a small number of manufacturing steps. In particular, in a press-fit terminal formed of a metal square wire, a fracture surface like a strip does not occur, and the plating layer is formed over substantially the entire surface. Excellent electrical conductivity is realized at the connection between the press-fit terminal and the mating part.

  According to a third aspect of the present invention, in the printed circuit board with a press-fit terminal described in the first or second aspect, a land portion where the projecting portion abuts on an opening peripheral portion of the through hole is the conductor. The land portions are integrally formed, and are shorter than the direction orthogonal to the alignment direction in the alignment direction of the through holes.

  According to the third aspect, in the alignment direction of the through holes, the length of the land portion formation region can be set small while sufficiently securing the space between the land portions to prevent short-circuiting between the land portions. The printed circuit board can be downsized.

  According to the present invention, the direction of the press-fit terminal with respect to the printed circuit board is set so that the protruding portion protrudes in a direction orthogonal to the alignment direction in which more through holes are arranged. Therefore, in the alignment direction of the through holes, there is no need for a space for allowing the protruding portion to protrude, and the interval between the press fit terminals can be set small. Miniaturization of the connector etc. which are comprised is achieved.

The perspective view which shows the printed circuit board with a press-fit terminal as 1st embodiment of this invention. The top view of the printed circuit board with a press-fit terminal shown in FIG. The perspective view which attached some press-fit terminals to the printed circuit board which comprises the printed circuit board with a press-fit terminal shown in FIG. The right view of the printed circuit board with a press fit terminal shown in FIG. The perspective view which shows the printed circuit board with a press-fit terminal as 2nd embodiment of this invention. The front view of the printed circuit board with a press fit terminal shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1 and 2 show a part of a printed circuit board with press-fit terminals (hereinafter referred to as a printed circuit board with terminals) 10 as a first embodiment of the present invention. The printed circuit board 10 with a terminal has a structure in which a plurality of press-fit terminals 14 are attached to a printed circuit board 12. In the following description, the vertical direction means the vertical direction in FIG. 1 which is the length direction of the press-fit terminal 14 in principle.

  More specifically, the printed circuit board 12 has a structure in which a printed wiring 18 is formed on an insulating substrate 16 formed of an insulating material such as a synthetic resin, and the printed wiring 18 is formed of a conductive material such as copper. As a result, a predetermined conductor pattern is formed on the surface of the insulating substrate 16. Furthermore, the surface of the printed wiring 18 is covered with a resist 20 formed of an insulating material such as synthetic resin.

  Further, as shown in FIG. 3, a plurality of through holes 22 penetrating in the thickness direction are formed in the printed circuit board 12, and the printed wiring 18 is electrically connected to the inner peripheral surface of the through hole 22. Through-hole plating 24 as a connected conductor is formed of a conductive material and exposed. The through-holes 22 penetrate the printed circuit board 12 with a substantially constant circular cross section, and a plurality of lines are arranged in a straight line in a plan view of the printed circuit board 12, and the plurality of lines are provided in parallel. ing. Further, the number of through-holes 22 forming a row in the alignment direction is larger than the number of columns provided in parallel (in other words, the number in the direction orthogonal to the alignment direction). , Each row is composed of three through holes 22a, 22b, 22c arranged in an aligned manner, and two rows in which the through holes 22a, 22b, 22c are arranged are formed. In short, the number of through-holes 22 arranged in the alignment direction (left and right direction in FIG. 2) indicated by arrows in FIG. 2 is three through holes in the direction (vertical direction in FIG. 2) perpendicular to the alignment direction. The number is larger than 22 (two).

  Further, a land portion 26 where the resist 20 is partially removed and the copper foil of the printed wiring 18 is exposed is formed at the peripheral edge of the opening of the through hole 22. The land portion 26 is formed so as to extend in a substantially oval shape in plan view of the printed circuit board 12, and the short axis direction is the alignment direction of the through holes 22 a to 22 c, and in the alignment direction of the through holes 22 a to 22 c. The length is shorter than the direction orthogonal to the alignment direction.

  On the other hand, the press-fit terminal 14 has a structure in which a substrate press-fit portion 30 is integrally formed at one end portion of a terminal body portion 28 having a longitudinal shape. The press-fit terminal 14 of the present embodiment is integrally formed as a whole, for example, by punching a plate material into a predetermined shape by pressing.

  The terminal body portion 28 has a quadrangular prism shape extending in a substantially constant rectangular cross section, and has a tapered shape in which the other end portion (upper end portion) gradually contracts toward the outside in the length direction. Further, the terminal main body 28 is made of, for example, a copper alloy such as tough pitch copper or brass, iron, or the like, and a plating layer is formed on the surface by lamination plating in which tin or the like is laminated on a base such as copper or nickel. ing.

  As shown in FIGS. 3 and 4, the substrate press-fit portion 30 includes a through hole 32 and a pair of elastic contact portions 34 and 34 formed on both sides of the through hole 32.

  The through-hole 32 is formed by punching a central portion of the press-fit terminal 14 in the width direction (left and right direction in FIG. 4) in the plate thickness direction (in FIG. 4, the direction perpendicular to the paper surface). The through-hole 32 in the present embodiment has a substantially rhombic hole cross-sectional shape, and one diagonal is longer than the other and extends on the central axis of the terminal body 28, and each apex is rounded. Is attached. However, the hole cross-sectional shape of the through hole 32 is not limited at all, and a circular shape including an ellipse, a polygonal shape including a rectangular shape, and other arbitrary shapes can be appropriately employed.

  Then, by forming the through hole 32 in the center portion in the width direction of the substrate press-fitting portion 30, the pair of elastic contact portions 34, 34 are formed by the side edges left on both sides in the width direction across the through hole 32. Is formed. The elastic contact portions 34, 34 can be bent and deformed in the width direction (left-right direction in FIG. 4) by forming the through-hole 32 in a substantially rhombus shape.

  Furthermore, a distal end insertion portion 36 is formed on the distal end side (lower side in FIG. 4) of the press-fit terminal 14 with respect to the substrate press-fit portion 30. The distal end insertion portion 36 has a tapered shape that gradually decreases toward the distal end side, and the maximum dimension in the width direction is smaller than the inner diameter dimension of the through hole 22.

  On the other hand, a pair of projecting portions 38 and 38 projecting toward both outer sides in the width direction are formed on the center side in the length direction (on the terminal main body portion 28 side) of the press-fit terminal 14 from the board press-fit portion 30. Yes. The overhanging portions 38, 38 have a substantially rectangular plate shape, and the upper surface and the lower surface (the upper surface and the lower surface in FIG. 4) extend substantially orthogonal to the length direction of the terminal main body 28. The upper surface of the overhanging portion 38 is a pressure-receiving surface 40 that is pressed by a jig when the press-fit terminal 14 to be described later is pressed into the through hole 22, and the lower surface of the overhanging portion 38 is the press-fit to be described later. The land contact surface 42 is superimposed on the land portion 26 when the terminal 14 is mounted on the printed circuit board 12.

  The press-fit terminal 14 having such a structure is attached to the printed circuit board 12. That is, the press-fit terminal 14 is inserted into the through hole 22 of the printed circuit board 12 from the tip insertion portion 36 side, and the elastic contact portions 34 and 34 of the substrate press-fitting portion 30 are inserted into the through hole 22. Since the distance between both outer surfaces in the width direction of the elastic contact portions 34, 34 is larger than the inner diameter dimension of the through hole, the elastic contact portions 34, 34 are press-fitted into the through hole 22, and the elastic contact portions 34, 34 are It is elastically bent and deformed in a direction approaching each other in the width direction. The elastic contact portions 34, 34 are pressed against the through-hole plating 24 formed on the inner peripheral surface of the through-hole 22 by the elastic restoring force in the direction of separating the elastic contact portions 34, 34 from each other. The As a result, the press-fit terminal 14 is fixed to the printed circuit board 12 in a standing state in which the board press-fit portion 30 is press-fitted into the through hole 22, and is electrically connected to the printed wiring 18 through the through hole plating 24. Has been.

  In the press-fit terminal 14, the elastic contact portions 34 and 34 are press-fitted into the through holes 22 when the pressure receiving surfaces 40 of the overhang portions 38 and 38 are pressed by a jig (not shown). Further, the press-fit terminal 14 has the elastic contact portions 34, 34 pressed against the through-hole plating 24, and the land contact surfaces 42 of the overhang portions 38, 38 are superimposed on the land portion 26 in a contact state. They are conducted to the printed wiring 18 by them.

  The press-fit terminals 14 are respectively attached to the two rows of through holes 22a to 22c, and the three press-fit terminals 14a, 14b, and 14c are arranged linearly in each row. Further, as shown in FIGS. 1 to 3, the three press-fit terminals 14 a to 14 c that are linearly aligned and mounted on the printed circuit board 12 have a pair of protruding portions 38 and 38 in the alignment direction. It is arranged in a direction protruding in a direction perpendicular to the direction.

  As described above, according to the printed circuit board 10 with terminals in which the press-fit terminals 14 are attached to the printed circuit board 12, the press-fit terminals 14 are arranged more in the alignment direction than in the direction orthogonal to the alignment direction. , 38 project in a direction perpendicular to the alignment direction. Therefore, in the alignment direction in which more press-fit terminals 14 are arranged, it is not necessary to ensure a large distance between the terminals in order to allow the protrusions 38 and 38 to protrude, and the press-fit terminals 14a to 14c are narrow. They can be arranged at intervals (pitch).

  Moreover, in the printed circuit board 12, the space | interval of the through-hole 22 can be made narrower in the alignment direction in which more through-holes 22 are formed, and size reduction of the printed circuit board 12 is achieved. Moreover, the land portion 26 that spreads around the opening peripheral edge of the through hole 22 extends in an oval shape because the land contact surfaces 42 of the overhang portions 38 and 38 are overlapped, but the short axis direction of the through hole 22 extends. The alignment direction can be set, and the interval in the alignment direction of the through holes 22 can be set small.

  FIG. 4 shows a part of a printed circuit board with press-fit terminals (hereinafter referred to as a printed circuit board with terminals) 50 as a second embodiment of the present invention. The printed circuit board 50 with a terminal has a structure in which a plurality of press-fit terminals 54 are attached to a printed circuit board 52. In FIG. 4, the printed circuit board 50 with a terminal is shown in a state before a part of the press-fit terminal 54 is attached to the printed circuit board 52. Moreover, in the following description, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  More specifically, the printed circuit board 52 has a structure in which the printed wiring 18 and the resist 20 are formed on the surface of the insulating substrate 16 as in the printed circuit board 12 of the first embodiment. Further, a plurality of through-holes 22 are formed so as to penetrate through, and a through-hole plating 24 as a conductor is formed on the inner peripheral surface. On the other hand, in the first embodiment, the land formed on the peripheral edge of the through-hole 22 is formed. The part 26 is omitted in this embodiment.

  The press-fit terminal 54 is formed with a substrate press-fit portion 30 on one end side (lower side in FIG. 5) of the terminal body portion 28 having a longitudinal shape, and between the terminal main body portion 28 and the substrate press-fit portion 30. Has a structure in which a pair of projecting portions 38, 38 projecting on both sides in the width direction are formed.

  Further, the press-fit terminal 54 of the present embodiment is formed by a metal square wire 56. That is, after the rectangular metal wire 56 extending in a substantially constant rectangular cross section is cut to a predetermined length, one end side of the terminal main body portion 28 is crushed in a direction perpendicular to the axis (left and right direction in FIG. 5) and protrudes in the width direction. The substrate press-fit portion 30 having a pair of elastic contact portions 34 and 34 is formed by partially flattening and forming the through hole 32 in the flattened portion. Furthermore, by crushing both end portions in the width direction (direction perpendicular to the paper surface in FIG. 5) between the terminal main body portion 28 and the substrate press-fitting portion 30 in the same direction perpendicular to the axis as the substrate press-fitting portion 30, and partially flattening. A pair of overhang portions 38 and 38 projecting outward in the width direction are formed. As described above, the press-fit terminal 54 according to this embodiment is formed by the metal rectangular wire 56.

  Further, a plating layer 58 is formed on the surface of the metal rectangular wire 56 forming the press-fit terminal 54 over substantially the entire surface excluding the both end surfaces in the length direction which are cut surfaces and the inner peripheral surface of the through hole 32. Has been. Particularly, the outer peripheral surface of the terminal main body 28 is covered with the plating layer 58 over the entire circumference.

  The press-fit terminal 54 is pressed against the through-hole plating 24 on the inner peripheral surface of the through-hole 22 by inserting the board press-fitting part 30 into the through-hole 22 of the printed board 52. It is mounted on the printed circuit board 52 in the connected state.

  Further, the press-fit terminal 54 protrudes in a direction perpendicular to the alignment direction of the through holes 22 (a direction perpendicular to the paper surface in FIG. 5) when the press-fit terminal 54 is attached to the printed circuit board 52. It is arranged in the direction. In the present embodiment, the pair of overhang portions 38 are separated from the surface of the printed circuit board 52 as shown in FIG.

  Also in the printed circuit board 50 with a terminal according to the present embodiment, the protruding direction of the overhanging portions 38 and 38 is relative to the alignment direction of the through holes 22 in which more press-fit terminals 54 are arranged. The directions are orthogonal. Therefore, it is possible to set the interval between the press-fit terminals 54 small, and it is possible to reduce the size of the connector including the printed circuit board 52 and the plurality of press-fit terminals 54.

  Furthermore, since the press-fit terminal 54 is formed of the metal rectangular wire 56 provided with the plating layer 58, the formation process of the plating layer 58 is not required after the overhang portions 38, 38 and the substrate press-fitting portion 30 are formed. The plating layer 58 is provided over substantially the entire outer peripheral surface of the press-fit terminal 54. Therefore, even when the mating part connected to the press-fit terminal 54 is brought into contact with the both sides in the width direction of the terminal body 28 and is conducted, the conductivity is improved by the plating layer 58 without increasing the number of manufacturing steps. Can be realized.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the specific numbers of the through holes 22 and the press-fit terminals 14 are not particularly limited as long as they are plural. Specifically, in the above-described embodiment, an example in which each row includes three through holes 22a, 22b, and 22c is shown, but the number of through holes 22 arranged in each row in the alignment direction is as follows. There may be two, or four or more. Furthermore, in the above-described embodiment, an example in which two rows of through holes 22 are provided in parallel is shown. However, one row may be provided, or three or more rows may be provided.

  Further, in the above embodiment, the number of through holes 22 in each row in the alignment direction is the same number (three), but it is not necessarily the same number. When the number of through holes 22 for each column is different from each other, it is sufficient that the number of through holes 22 in at least one column is larger than the number of columns, and the number of through holes 22 in all columns is not necessarily the number of columns. It doesn't have to be more.

  In the above embodiment, the press-fit terminal formed as a whole is illustrated as an example. However, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2013-149578, the terminal main body portion, the substrate press-fit portion, and the overhang terminal are illustrated. The press-fit terminal may be formed by forming the part separately and fixing it afterward. Further, the terminal main body portion, the substrate press-fitting portion, and the overhang portion of the press-fit terminal are not limited in specific shape or size.

10, 50: Printed board with press-fit terminal, 12, 52: Printed board, 14, 54: Press-fit terminal, 16: Insulated board, 18: Printed wiring, 22: Through hole, 26: Land part, 30: Press-fitted board Part, 38: overhang part, 56: metal square wire, 58: plating layer

Claims (3)

A plurality of through holes are formed through a printed circuit board in which a printed wiring is formed on an insulating substrate, and a conductor formed on the inner peripheral surface of the through hole is electrically connected to the printed wiring and is elongated. A board press-fit portion provided at one end of a press-fit terminal having a shape is inserted into the through hole, and the press-fit terminal is brought into contact with the conductor by elastically pressing the board press-fit portion with the conductor. In a fixed printed circuit board with press-fit terminals,
A plurality of the through holes are arranged linearly on the plane of the printed circuit board, and the through holes are arranged in an alignment direction in a direction larger than a direction orthogonal to the alignment direction;
A pair of projecting portions projecting toward both outer sides perpendicular to the length direction of the press-fit terminal are formed on the center side in the length direction from the substrate press-fitting portion in the press-fit terminal,
A printed circuit board with a press-fit terminal, wherein the pair of protruding portions protrude in a direction perpendicular to the alignment direction of the through holes in a mounted state in which the substrate press-fitting portions are inserted into the through holes.   The printed board with a press-fit terminal according to claim 1, wherein the press-fit terminal is formed of a metal square wire having a plating layer on a surface thereof.   A land portion with which the projecting portion abuts is formed integrally with the conductor at the opening peripheral edge portion of the through hole, and the land portion is shorter than the direction perpendicular to the alignment direction in the alignment direction of the through hole. The printed circuit board with a press-fit terminal according to claim 1 or 2.

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