JP4421766B2 - Socket contact terminal manufacturing method and board socket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a socket contact terminal for inserting a printed wiring board to obtain electrical connection , and a board socket .
[0002]
[Prior art]
In printed circuit board sockets such as card edge connectors, a plurality of conductively arranged external terminal pads formed on both sides of the end portion of the printed wiring board are sandwiched and placed in pressure contact with these external terminal pads. It has a pair of contact pieces.
[0003]
In such a conventional printed circuit board socket, since each contact piece is a single point contact with one external terminal pad,
・ The contact area is small and the allowable current that can be passed is limited. ・ The glass fiber dust of the printed circuit board adheres to the surface of the external terminal pad and impairs the reliability of the contact between the pad and the contact piece. It has problems such as poor performance.
[0004]
Therefore, the present applicant has applied for Japanese Patent Application No. 11-192372 (filed on Jul. 6, 1999, title of invention; clamping socket) so as to solve the above problems by the invention of this application. I have to.
[0005]
In the invention described in Japanese Patent Application No. 11-192372, as shown in FIG. 4, upper and lower two-contact type contact pieces are employed.
[0006]
The contact piece shown in FIG. 4 shows one of a pair of contact pieces arranged to face each other, and a first spring piece part having a mounting terminal part 101 penetrating the socket body and projecting downward, and an outer contact part 102. 103, a second spring piece portion 105 having an inner contact portion 104, a connecting portion 106 for connecting the first spring piece portion 103 and the second spring piece portion 105, and the like.
[0007]
In this contact piece, the outer contact portion 102 and the inner contact portion 104 that have been bent are stretched to the original flat plate state, and the first spring piece portion 103 is bent approximately 180 degrees via the connecting portion 106 ( An unfolded second spring piece 105 that has been bent (box bent) becomes the shape of a blank material obtained by punching a thin metal plate.
[0008]
That is, in this contact piece, the second spring piece part 105 is overlapped on the first spring piece part 103 by bending the second spring piece part 105 by 180 degrees via the connecting part 106. A shear surface (hereinafter referred to as a sag surface) having a sag in the press punching of a front surface (a surface that contacts the external terminal pad of the printed circuit board) of the outer contact portion 102 of the first spring piece 103. In other words, the protruding front surface of the second spring piece 105 on the inner contact portion 104 (the surface in contact with the external terminal pad of the printed circuit board) is a return in press punching. It is formed as a fracture surface (hereinafter also referred to as a burr surface) having (burrs) (see FIG. 5).
[0009]
[Problems to be solved by the invention]
As described above, in the contact terminal shown in FIG. 4, since one of the front surfaces of the two contact portions 102 and 104 is a burr surface, deburring is performed to reduce damage to the contact surface of the printed circuit board. There were problems such as the need for countermeasures and increased manufacturing costs.
[0010]
In the contact terminal shown in FIG. 4, the second spring piece 105 is overlapped with the first spring piece 103 by bending the second spring piece 105 by 180 degrees through the connecting portion 106. Therefore, there is a problem that a large number of blank materials cannot be efficiently obtained from one metal thin plate unless the developed shape is large and wide and the punching layout is not devised.
[0011]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a socket contact terminal that does not damage a printed circuit board to be inserted without taking a deburring measure and a method for manufacturing the same. To do.
[0012]
Another object of the present invention is to provide a method of manufacturing a contact terminal for a socket and a socket for a substrate that can efficiently obtain a large number of blanks from a single metal thin plate and reduce the material cost. And
[0015]
[Means for Solving the Problems]
The method for manufacturing a contact terminal for a socket according to the present invention includes two protruding first and second contact portions that are capable of contacting one external terminal of a printed circuit board and are substantially one-dimensionally distributed. In the method of manufacturing a contact terminal for a socket that is implanted in the socket so that the two contact portions are arranged in a line along the insertion direction of the printed circuit board, the socket is obtained by punching a metal flat plate material. A first step of forming a blank material in which a first spring piece portion including the first contact portion and a second spring piece portion including the second contact portion are branched from a fixing portion fixed to the first portion; And a second step of bending the first and second spring piece portions so that the second spring piece portion protrudes toward the sag surface side of the burr surface and the sag surface of the blank material with respect to the fixed portion; The first bar A third step of performing a process of relatively moving the first and second spring piece portions so that the first contact portion of the piece portion and the second contact portion of the second spring piece portion are substantially in a line; The contact surfaces of the first and second contact portions with the external terminals of the printed circuit board are both formed as flat surfaces on the sag surface side of the shearing process.
[0016]
In this invention, a contact terminal is formed using a blank material in which a first spring piece portion including a first contact portion and a second spring piece portion including the second contact portion are branched from a fixed portion fixed to a socket. Since it can be manufactured, it is not necessary to particularly secure a connecting portion for connecting the first spring piece portion and the second spring piece portion, and the area (width) of one blank material can be small. Therefore, many blank materials can be efficiently acquired from one metal thin plate, and it becomes possible to reduce the material cost of a contact terminal.
[0017]
In addition, since the contact terminals manufactured by the manufacturing method of the present invention have both contact surfaces with the external terminals of the printed circuit board at the two contact portions, both are formed as flat surfaces on the side of the shearing process, Without taking measures against deburring, the printed circuit board inserted into the socket is not damaged.
Furthermore, the socket for a board according to the present invention includes a contact terminal manufactured according to the above-described manufacturing method, a housing having a contact accommodating portion in which the contact terminal is disposed,
A recess formed in the housing and into which a substrate having a conductive pad connected to the contact portion of the contact terminal is inserted.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0019]
FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a card edge socket 10. FIG. 2 is a plan view showing one contact terminal implanted in the card edge socket 10.
[0020]
A printed wiring board (card) 1 inserted into a card edge socket 10 has a card edge portion 3 in which a plurality of conductive pads 2 are arranged on the front and back surfaces in the vicinity of the edge portion. The card 1 is inserted into the card edge socket 10 with the card edge portion 3 facing forward.
[0021]
The card edge socket 10 has a housing 11 made of resin or the like. The socket housing 11 has a rectangular long groove-shaped recess 12 opened on the upper surface side thereof. The opening side of the recess 12 is widened in a tapered shape so that the card 1 can be easily inserted. A bottom plate member 13 with which the card edge portion 3 of the inserted card 1 abuts is provided on the bottom surface of the recess 12.
[0022]
The socket housing 11 has a plurality of contact accommodating portions (holes) 14 for disposing the contact terminals 20 so as to be orthogonal to the longitudinal direction of the concave portion 12 (perpendicular to the paper surface). I have. Each contact accommodating portion 14 is defined by a partition wall 15. A press-fit groove 16 for press-fitting and fixing a fixed portion of the contact terminal 20 is formed at the bottom of each contact accommodating portion 14.
[0023]
The contact terminals 20 made of a conductive metal having elasticity are arranged in each of the contact accommodating portions 14, so that the plurality of pairs of contact terminals 20 are recessed so that the pair of contact terminals 20 are opposed to each other. 12 parallel to the longitudinal direction.
[0024]
As shown in FIGS. 1 and 2, each contact terminal 20 is formed of a metal cantilever spring piece, a terminal portion 21 that is solder-connected to a printed wiring board to which the socket 10 is attached, a socket A fixing portion 22 for press-fitting and fixing (planting) into the press-fitting groove 16 of the housing 11, and two first spring piece portions 23 and second spring piece portions 24 branched from the fixing portion 22 are provided.
[0025]
When the terminal portion 21 of each contact terminal 20 is implanted in the socket housing 11, the terminal portion 21 protrudes from the lower surface of the housing 11, and the protruding terminal portion 21 is inserted into a through hole or the like of a printed circuit board (not shown). By being soldered, it is mounted on a printed wiring board.
[0026]
One longer first spring piece portion 23 has a first contact portion 23a bent so as to protrude substantially in an arc shape, and the distal end side of the first contact portion 23a does not hinder the insertion of the card 1. So that it is bent outward. The tip end portion 23b of the first spring piece portion 23 is displaced in a regulating groove 17 formed on the opening side of each contact accommodating portion 14, thereby preventing the steady state.
[0027]
The other shorter second spring piece 24 is bent so as to be bent up so as to rise at a steep angle from the branching source of the fixing portion 22, and is bent so as to protrude in a substantially arc shape from the upright portion 24c. And a second contact portion 24a. The distal end portion of the second spring piece portion 24 is also bent outward so as not to hinder the insertion of the card 1.
[0028]
The first contact portion 23a and the second contact portion 24a are formed to be thicker than the branch source so that they can contact the conductive pad 2 of the card 1 with a larger area.
[0029]
In the contact terminal 20 of this embodiment, as shown in FIG. 2, the first contact portion 23 a of the first spring piece portion 23 and the second contact portion 24 a of the second spring piece portion 24 are one of the cards 1. The contact pads 20 are distributed one-dimensionally along the longitudinal direction of the contact terminals 20 so as to be in contact with the conductive pads 2.
[0030]
Here, the second spring piece portion 24 of the contact terminal 20 of this embodiment is not box-bent like the contact terminal shown in FIG. 4, but the second spring piece portion 24 becomes the first spring piece portion 23. The first contact portion 23a and the second contact portion 24a are arranged on the same axis line simply by bending the branching source of the second spring piece portion 24 so as to move closer to each other. The bending process of the second spring piece 24 will be described in detail later.
[0031]
In each pair of contact terminals 20 arranged to face each other, the interval between the first contact portions 23a is set to be smaller than the interval between the second contact portions 24a.
[0032]
According to this card edge socket 10, when the card 1 is inserted into the recess 12 with the card edge portion 3 of the card 1 aligned with the opening of the recess 12 of the socket housing 11, first the left and right first The spring piece portion 23 is spread and the first contact portion 23a of the first spring piece portion 23 of each contact terminal 20 and the corresponding conductive pad 2 of the card 1 are slid while being pressed against each other. Accordingly, foreign matters such as dust, dust, and oxide film adhering to the surface of the first contact portion 23a of each contact terminal 20 or the conductive pad 2 are excluded.
[0033]
When the card 1 is further inserted, the second contact portion 24a of the second spring piece portion 24 of each contact terminal 20 is also expanded to the left and right, and the second contact portion 24a is also brought into contact with the conductive pad 2 together with the first contact portion 23a. Will be. When both the contact portions 23a and 24a are in contact with the pad 2, since the foreign matter attached on the pad 2 has already been removed, the pad 2 and the second contact portion 24a are reliably electrically connected.
[0034]
Here, according to the contact terminal 20 used in this card edge socket, the second spring piece portion 24 is moved closer to the first spring piece portion 23 without inverting the front and back surfaces of the second spring piece portion 24. Thus, since the first contact portion 23a and the second contact portion 24a are one-dimensionally distributed, the front surfaces (the pads 2 and 2a) of the first contact portion 23a and the second contact portion 24a are realized. The surface on the contact side) can be formed as the sag surface side in the shearing process described above. Therefore, unlike the prior art, a deburring measure on the burr surface side becomes unnecessary, and the manufacturing cost can be reduced.
[0035]
Next, a manufacturing procedure of the contact terminal 20 described above will be described with reference to FIGS. 3 (a) to 3 (e).
[0036]
(1) By punching a metal flat plate material, the terminal portion 21, the fixing portion 22, and the first spring piece portion 23 and the second spring piece portion 24 branched from the fixing portion 22 into two are provided continuously. A blank material having a shape as shown in FIG. 3A is formed. In the formed blank material, the first spring piece portion 23 extends straight from the fixed portion 22, but the second spring piece portion 24 extends obliquely from the fixed portion 22 at a slight angle. Has been. A notch (slit) 30 for forming two divided spring pieces is formed between the first spring piece 23 and the second spring piece 24.
[0037]
In this case, a slit 30 that bites into the first spring piece portion 23 side is formed so that a substantially half portion on the proximal end side of the first spring piece portion 23 adjacent to the second spring piece portion 24 becomes narrow. Since the branching source width ta of the first spring piece part 23 and the second spring piece part 24 and the width tb of the contact part 23a of the first spring piece part 23 are substantially the same, The length by which the two spring piece portions 24 protrude from the side of the blank can be reduced. Therefore, the width (area) of the blank material can be reduced, and many blank materials can be efficiently punched from the metal flat plate material.
[0038]
(2) Next, as shown in FIG. 3 (b), the first spring piece portion 23 is raised with respect to the fixed portion 22 by bending the first spring piece portion 23 at a plurality of locations. The first contact portion 23a protruding to the bottom is formed.
[0039]
(3) Next, as shown in FIG. 3 (c), by bending the second spring piece 24 at a plurality of locations, the second spring piece 24 is raised with respect to the fixed portion 22 and is substantially arc-shaped. The second contact portion 24a protruding to the bottom is formed.
[0040]
(4) Finally, as shown in FIG. 3 (d) and FIG. 3 (e), the second spring piece portion so that the second spring piece portion 24 is moved toward (moves close to) the first spring piece portion 23. The first contact portion 23a and the second contact portion 24a are arranged on the same axis line by bending the branching source 24. In this way, the contact terminal 20 as shown in FIG.
[0041]
As described above, according to this embodiment, the contact surfaces of the two contact portions 23a and 24a with the external terminals of the printed circuit board are both formed as flat surfaces on the sag surface side of shearing (pressing). Thus, since the contact terminal 20 is formed, it is not necessary to take measures against deburring.
[0042]
Further, according to this embodiment, the blank material in which the first spring piece portion 23 including the first contact portion 23 a and the second spring piece portion 24 including the second contact portion 24 a are branched from the fixed portion 22 is used. Since the contact terminal is manufactured, there is no need to particularly secure the connecting portion 106 for connecting the first spring piece portion and the second spring piece portion as in the prior application technique shown in FIG. The area (width) of one blank material can be small. Therefore, many blank materials can be efficiently acquired from one metal thin plate, and it becomes possible to reduce the material cost of a contact terminal.
[0043]
According to the contact terminal 20 of the above embodiment, the first spring piece portion 23 extends straight from the fixed portion 22 and only the second spring piece portion 24 extends obliquely from the fixed portion 22. Both the first and second spring pieces 23 and 24 form a blank piece, for example, a Y-shape, which is obliquely branched from the fixed portion 22, and both the first and second spring pieces are moved toward each other. The contact terminals in which the first and second contact portions 23a and 24a are one-dimensionally distributed and arranged may be formed by bending in such a manner.
[0044]
In the above embodiment, the card edge connector used for the card edge board in which the contact pads are arranged on both sides of the board has been described as an example. However, the card edge in which the contact pads are arranged only on one side of the board. The present invention may be applied to a board connector.
[0045]
Moreover, the socket to which the present invention is applied can be loaded with any other printed wiring board other than the card edge board.
[0046]
【The invention's effect】
As described above, according to the present invention, both the contact surfaces of the two contact portions of the contact terminal with the external terminal of the printed circuit board are formed as flat surfaces on the sag surface side of the press work. Without taking countermeasures, the printed circuit board inserted into the socket is not damaged, and the manufacturing cost of the contact terminal can be reduced.
[0047]
Further, according to the present invention, since the contact material is manufactured by using the blank material in which the two spring pieces are branched, the two spring pieces are moved relatively close to each other. There is no need to particularly secure a connecting portion for connecting the two spring pieces, and the width and area of one blank can be reduced. Therefore, many blank materials can be efficiently acquired from one metal thin plate, and it becomes possible to reduce the material cost of a contact terminal.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a card edge socket to which the present invention is applied.
2 is a plan view showing one contact terminal implanted in the card edge socket of FIG. 2; FIG.
FIG. 3 is a process diagram showing a manufacturing process of a contact terminal.
FIG. 4 is a diagram showing a prior application technique.
FIG. 5 is a diagram for explaining a sagging surface and a burr surface in a shearing process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Card 2 Conductive pad 3 Card edge part 10 Card edge socket 11 Socket housing 12 Recess 13 Bottom plate member 14 Contact accommodating part 15 Partition 16 Press-fit groove 17 Restriction groove 20 Contact terminal 21 Terminal part 22 Fixing part 23 First spring piece part 23a First contact portion 23b Tip portion 24 Second spring piece portion 24a Second contact portion 24c Upright portion 30 Slit

Claims (2)

There are two projecting first and second contact portions that can come into contact with one external terminal of the printed circuit board and are distributed in a substantially one-dimensional manner, and the two contact portions are formed on the printed circuit board. In the method for manufacturing a contact terminal for a socket that is implanted in a socket so as to be in a line along the insertion direction,
By punching the metal flat plate material, the first spring piece portion including the first contact portion and the second spring piece portion including the second contact portion are branched from the fixed portion fixed to the socket. A first step of forming a blank material;
A second step of bending the first and second spring pieces so that the first and second spring pieces protrude from the burr surface and the sag surface of the blank material toward the sag surface with respect to the fixed part. When,
Processing is performed to relatively move the first and second spring piece portions so that the first contact portion of the first spring piece portion and the second contact portion of the second spring piece portion are substantially aligned. The third step;
With
A method of manufacturing a contact terminal for a socket, characterized in that the contact surfaces of the first and second contact portions with the external terminals of the printed circuit board are both flat surfaces on the side of a shearing sag surface . A contact terminal manufactured according to the manufacturing method of claim 1;
  A housing having a contact accommodating portion in which the contact terminal is disposed;
  A recess formed in the housing and into which a substrate having a conductive pad connected to a contact portion of the contact terminal is inserted;
  A socket for a circuit board comprising:

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