JP2011210375A - Connector pin, press-fit connector, and press-fit connector mounting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector pin, a press-fit connector, and a press-fit connector mounting method.SOLUTION: The connector pin is part of each of press-fit connectors which are press-fitted in a through-hole of a printed board from both sides of the through-hole. The connector pin includes a terminal, a press-fit portion connected to the terminal, and a front portion connected to the press-fit portion. The press-fit portion is plastically deformed by the front end of the connector pin press-fitted in the through-hole from the opposite side to the press-fit portion side, and press-fitted to the inner peripheral surface of the through-hole.

Description

  The present invention relates to a connector pin, a press fit connector, and a press fit connector mounting method.

  There is known a press-fit connector in which a connector pin is press-fitted into a through hole of a printed board and the connector is mounted without using solder. Since solder contains harmful substances such as lead, it is attracting attention because it can be mounted lead-free, and the conventional solder connection is replaced with a press-fit connection. In addition, it is possible to reduce the number of steps because it can be mounted simply by press-fitting, and since it does not require a heating process, the choice of the material of the connector housing with respect to heat resistance is also widely used.

  An example of the structure of a connector pin 10 of a conventional press fit connector is shown in FIG. 8 and includes a terminal portion 11, a press fit portion 12 and a tip portion 13. The terminal portion 11 is a portion connected to the receptacle, and the press fit portion 12 is press-fitted into the through-hole and elastically deformed, and the inner peripheral surface of the through-hole is press-contacted mechanically and electrically by a restoring force of elastic deformation. It is the part that makes the connection. The tip portion 13 serves to guide the connector pin 10 to the through hole.

  The press fit connector is a connector housing in which a plurality of the connector pins shown above are inserted into a connector housing (hereinafter referred to as a housing). The terminal portion 11 is provided inside the housing, with the press fit portion 12 and the tip portion. 13 protrudes from the housing. When mounting this press-fit connector on a printed circuit board, only the tip of the connector pin is inserted into the through-hole (referred to as temporary mounting), and the press-fit connector is used to press the press-fit connector in that state. The mounting is completed by press-fitting the portion 12 into the through hole (corresponding to the previous provisional mounting, here, this mounting is called). The press fit portion 12 press-fitted into the through hole is elastically deformed as described above, press-contacts the inner peripheral surface of the through hole, and covers the inner peripheral surface (the inner peripheral surface is formed by electrolytic plating). ).

  The above-mentioned press-fit connector is mounted by inserting the press-fit connector from one side of the printed circuit board, but both sides of the printed circuit board are used by using the same through-holes as electronic devices become smaller and circuits become more complex There is a demand to install a press-fit connector. In this case, several problems arise when trying to perform double-sided mounting using the same through-hole using a press-fit connector having a conventional structure. FIG. 9A shows the conventional mounting of the press fit connector 30, and one connector pin 10 is press-fitted into each through hole 41 of the printed circuit board 40 (FIG. 9 ( The press-fit connector 10 shown in a) shows a part of the whole, and the part of the through hole 41 is shown in cross section).

  When trying to insert the press fit connector 10 shown in FIG. 9A from both sides of the same through hole 41, the end portions 13 of the connector pins 10 interfere with each other in the through hole 41, and the press fit portion 12 cannot be press-fitted. It is. For this purpose, as shown in FIG. 9B, by using the connector pin 11 in which the tip portion 13 is made extremely short or no tip portion is provided and the length of the press fit portion 12 is shortened. Interference can be eliminated. However, a new problem arises in this case.

  FIG. 10 shows a state of temporary mounting before press-fitting the press-fit connector 31. The left figure shows a case where the connector pin 11 is normal, and the right figure shows a case where the connector pin 11 is bent. Yes. In the temporarily mounted state, the press-fit connector 31 when the connector pin 11 is bent (that is, the right figure) is a press-fit connector having a height d compared to the normal press-fit connector 31 (left figure). 31 will be in a state of floating upward. However, since this height d is a slight difference in height, it may be overlooked without being detected as a failure during temporary mounting. In such a case, the through-hole 41 is damaged at the time of actual mounting, and the printed circuit board 40 is made unusable. When the printed circuit board 40 is not detected even at the actual mounting, it is incorporated into an electronic device and becomes a loose contact state. Reliability will be impaired.

  In addition to the above problem, it is conceivable that when the length of the press fit portion 12 is shortened, the portion that presses the inner peripheral surface of the through hole is reduced, and the mechanical strength is lowered.

  Patent Document 1 discloses a technique for mounting by inserting press-fit pins from both sides of a through hole. Here, the shape of the tip of the first press-fit pin is a V-shaped recess, the shape of the tip of the second press-fit pin is a V-shaped projection, and the first and second press-fit pins Is press-fitted from the opposite side of the through hole, the convex portion is inserted into the concave portion, the concave portion is expanded, and the mechanical and electrical connection is performed by biting into the wall of the through hole.

Japanese Patent Laid-Open No. 03-272575

  As mentioned above, as electronic devices become smaller and circuits become more complex, components mounted on printed circuit boards are required to be mounted with high density, and press-fit connectors are also mounted from both sides using the same through-holes. It is requested to do. In the conventional press-fit connector, there is a problem that the connector pins interfere with each other in the through-hole and cannot be mounted.

  In the method disclosed in Patent Document 1, one press-fit pin expands the tip of the other press-fit pin, thereby leading the bite into the inner wall of the through hole to achieve connection. A press-fit pin with a concave tip has a high mechanical connection strength because the recess is pushed out and bites into the inner wall of the through-hole, but the press-fit pin with the other tip is convex. I'm worried about my strength. For this reason, there is a problem in adopting the press fit connector.

  The present invention is made in order to solve the above-mentioned problem. When a press-fit connector is mounted from both sides of the same through-hole, a connector pin and a press-fit connector that can provide sufficient mechanical and electrical connection quality. And a press-fit connector mounting method.

  In order to solve the above-described problems, the connector pin of the present invention includes a terminal portion, a press fit portion connected to the terminal portion, and a tip end portion connected to the press fit portion, and the press fit portion is opposite in the through hole. It is characterized in that plastic deformation is caused by the tip portion of the connector pin press-fitted from the side, and is press-contacted to the inner peripheral surface of the through hole.

  When the connector pins are press-fitted from both sides of the through hole, the tip of each connector pin causes plastic deformation in the other press-fit portion, and the plastically deformed portion presses the inner peripheral surface of the through hole mechanically, Electrical connection is made.

  When mounting on a printed circuit board, each of the connector pins inserted from both sides in the through-hole causes plastic deformation and press-contacts the inner peripheral surface of the through-hole, enabling reliable mechanical and electrical connection Connector pins can be provided.

  Moreover, since the length of the tip part of the connector pin can be secured, oversight of problems such as bent pins during temporary mounting can be reduced.

It is a structural example of the connector pin of this invention. It is an example of insertion into a press fit connector and a printed circuit board. It is an example of mounting a press-fit connector on a printed circuit board. It is an example of pin bending defect detection of the press fit connector of the present invention. It is an example of a mounting flow of a press-fit connector. It is the mounting example (the 1) of a press fit connector. It is a mounting example (the 2) of a press fit connector. It is a structural example of the conventional connector pin. It is an example of mounting a press-fit connector on a printed circuit board. It is an example of detecting a pin bending defect when the tip is shortened.

  A structural example of the connector pin of the present invention will be described with reference to FIG. As shown in FIG. 1, the connector pin 100 is a rod having a prism shape as a whole, and includes a terminal portion 110, a press fit portion 120, and a tip portion 130. The terminal portion 110 and the tip portion 130 constitute both end portions of the connector pin 100, and the press fit portion 120 is sandwiched between the terminal portion 110 and the tip portion 130.

  The terminal part 110 has a square pillar with a square cross section, and four surfaces constituting the terminal part 110 are extended and connected to the press fit part 120.

  The press fit portion 120 has an ellipse penetrating between surfaces sandwiched between a surface 101 (referred to here as the first surface 101) and a surface 102 (referred to as the second surface 102 here) shown in FIG. A hole 105 is formed. The thickness “t2” of the thinnest portion between the through hole 105 and the second surface 102 is made thinner than the thickness “t1” of the thinnest portion between the through hole 105 and the first surface 101. (The portion between the through hole 105 and the second surface 102 is called a beam).

  The tip portion 130 has an end portion on the side for insertion into the through hole, and has a rectangular cross section and a plate shape as a whole. The plate thickness is equal to or less than ½ of the plate thickness of the press fit portion 120 or the terminal portion 110 (that is, the plate thickness between the first surface 101 and the second surface 102). The rear surface of the tip 130 shown in FIG. 1 is a first surface 101 extending from the press fit portion 120, and the opposite surface 103 (herein referred to as the third surface 103) is the first surface 101 of the press fit portion 120. The second surface 102 and the inclined surface 104 are connected. As shown in FIG. 1, the end portion of the tip portion 130 has a chamfered tongue shape.

  In this embodiment, the connector pin 100 is made of 0.32 mm square phosphor bronze, the press hole 120 has a through hole 105 with a longitudinal diameter of 0.83 mm, a short diameter of 0.18 mm, and a t1 portion. The wall thickness is 0.08 mm, and the wall thickness of the t2 portion is 0.06 mm. Moreover, the plate | board thickness of the front-end | tip part 130 is 0.16 mm, and length is 0.56 mm. The connector pin 100 described above is for a printed board having a plate thickness of 3 mm and a through-hole diameter of 0.45 mmφ. If the plate thickness and through-hole diameter are different, these numbers will be different. .

  FIG. 2A shows a press fit connector 300 using the connector pin 100 shown above. In the press fit connector 300, the connector pin 100 is inserted into the housing 200. However, the tip portion 130 and the press fit portion 120 protrude outside the housing 200 (below the housing 200 in FIG. 2A) and are inserted. I am letting. At this time, the tip portions 130 of all the connector pins 100 inserted through the housing 200 are arranged in the same direction. In FIG. 2A, the third surface 103 of the distal end portion 130 is disposed so as to face to the left.

  FIG. 2B shows a state where the press fit connector 300 is inserted into the printed circuit board 400. When the press-fit connector 30 shown in the conventional example is inserted into the printed board, the press-fit portion 12 hits (contacts) the printed board, and only the tip portion 13 is inserted into the through-hole, but the press-fit connector 100 of the present invention has the tip end. The housing 1200 including the part 130 and the press fit part 120 is inserted until the bottom surface of the housing 1200 contacts the printed circuit board 400. The state of the connector pin 100 and the through hole 410 in the A-A ′ cross section in the left diagram of FIG. There is a slight gap between the connector pin 100 and the through hole 410. Moreover, the dotted line shown in the figure shows the through hole 105.

  Next, a state where the press-fit connector 300 of the present invention is plastically deformed and mechanically and electrically connected in the through hole 410 will be described. 3A shows a state in which the press fit connector 300 is inserted from both sides of the through-hole 410 of the printed circuit board 400 (from the top and bottom in FIG. 3A) (that is, a temporarily mounted state). At this time, the press-fit connector 300 inserted from both sides is the same press-fit connector 300, and is inserted into one press-fit connector 300 by changing the direction by 180 degrees. For this reason, the front end portions 130 of the connector pins 100 are combined in a “巴” shape. In this state, the distal end portion 130 is inserted until it contacts the press fit portion 120 of the mating connector pin 100. If the two press-fit connectors 300 are simultaneously inserted, the insertion of the two housings 200 into the through-holes 410 is stopped while the housings 200 are “k” floating from the printed circuit board 400 as shown in FIG.

  Next, when both press-fit connectors 300 are press-fitted from above and below in the state of FIG. 3A, the distal end portions 130 of the through holes 410 enter the inner peripheral surface of the through holes 410 while being guided by the inclined surfaces 104. As the tip portion 130 enters the beam, the press-fit portion 120 undergoes plastic deformation. FIG. 3B shows a state where plastic deformation is caused by press-fitting, and the tip portion 130 and the press fit portion 120 press-contact the inner peripheral surface of the through-hole 410 to obtain mechanical joining. Further, since the conductor film by plating is formed on the inner peripheral surface of the through hole 410, electrical connection can be obtained. The plastic deformation occurs when the elastic deformation exceeds the limit, but it seems that a part of the deformed press-fit portion 120 has an elastic deformation portion in addition to the plastic deformation. In addition, the arrow of FIG.3 (b) has shown the direction of press injection.

  The connector pins 100 of the press-fit connector 300 inserted from both sides enter the through holes 410 by the length of “k” shown in FIG. 3A by press-fitting to the beam portion of the press-fit portion 120. It will cause plastic deformation.

  The reason why the thin-walled beam is formed by the through hole 105 is to make it easy to cause plastic deformation by press-fitting the tip portion 130. In addition, since the inclined surface is provided on the surface following the second surface 102 of the press fit portion 120 to the third surface 103 of the tip portion 130, the tip portion 130 enters the beam along the inclined surface. This is to make it easier. Furthermore, the reason why the end portion of the tip portion 130 is chamfered into a tongue-like shape is that the tip portion 130 enters the through hole 410 and the mating connector pin 100 enters the third surface 103 to be caught. This is to make the entry smoothly.

  As shown in FIGS. 1 to 3, the tip portion 130 of the connector pin 100 of the present invention can have the same length as that of the conventional connector pin 30. Can be easily detected. FIG. 4 shows this state, and the press-fit connector 301 inserted from above is in a state where the height is “h” higher than the printed circuit board 400 due to the bending of the pin, and since the floating amount is large, the detection of the bent pin is easy. is there. The lower press fit connector 300 is normally inserted into the printed circuit board 400.

  Next, a method for mounting the press-fit connector 300 of the present invention on the printed circuit board 400 will be described using the mounting flow of FIG. Further, FIG. 6 and FIG. 7 are used supplementarily in the description of the mounting flow.

  First, the printed circuit board 400 is mounted on the mounting table with the A surface 420 facing upward. Subsequently, the first press fit connector 310 is gripped, and the first press fit connector 310 is inserted into the through hole 410 at the mounting position from above the printed circuit board 400. The first press-fit connector 310 is inserted into the through-hole 410 at the front end protruding from the bottom surface of the housing 200 and the entire press-fit portion, so that the bottom surface of the housing 200 is in contact with the printed circuit board 400 (this state Temporary mounting 1). FIG. 6A shows the state of the temporary mounting 1. In addition, the printed circuit board 400 shall be mounted on the mounting base which is not shown in figure (step S1-S3).

  From above the inserted first press-fit connector 310, the printed circuit board 400, the housing 210 of the press-fit connector 310, and the jig 500 that contacts the connector pins 140 are placed. The jig 500 is sized to cover the entire printed circuit board 400, and if other circuit components are mounted on the printed circuit board 400, the part is formed as a recess so that the electronic component and the jig 500 do not touch each other. To do. FIG. 6B shows a state in which the jig 500 is placed over the first press-fit connector 310 (step S4).

  The first press-fit connector 310 is inserted into the printed circuit board 400, and the jig 500 is placed on the printed circuit board 400. The first press-fit connector 310 is turned over and placed on a mounting table (not shown). FIG. 6C shows a state in which FIG. 6B is turned upside down. By turning over, the upper surface of the printed circuit board 400 becomes the B surface 430 (step S5).

  The second press-fit connector 320 is gripped, gripped by changing the direction of the first press-fit connector 310 by 180 degrees, and inserted in the through-hole 410 into which the first press-fit connector 310 is inserted while maintaining the direction. . By inserting 180 degrees, the tip of the connector pin 140 of the first press-fit connector 310 and the tip of the connector pin 150 of the second press-fit connector 320 are opposed to each other in the through hole 410. Are combined. This state is referred to as provisional mounting 2 and is shown in FIG. 6D (steps S6 and S7).

  Subsequently, the press-fitting head 600 is attached to the second press-fit connector 320 in the temporary mounting 2 state. The press-fitting head 600 is formed so as to abut (abut) the inner bottom portion of the housing 220 and the end portion of the terminal portion of the connector pin 150. FIG. 7E shows a state where the press-fit head 600 is attached to the second press-fit connector 320 (step S8).

  The press-fitting head 600 attached to the second press-fit connector 320 is pressed downward, and the connector pins 150 of the second press-fit connector 320 are press-fitted into the through holes 410. By pressing, the tip of the connector pin 150 enters the inclined surface of the first press-fit connector 310 and is guided to the inner peripheral surface of the through hole 410 and enters the beam to cause plastic deformation in the press-fit portion. Let In addition, the distal end portion of the connector pin 140 of the first press-fit connector 310 causes plastic deformation of the press-fit portion of the second press-fit connector 320. FIG. 7 (f) shows a state where the press-fitting has been completed and plastic deformation has occurred in the press-fit portions of the first and second press-fit connectors 310 and 320. In addition, the arrow of FIG.7 (f) has shown the press injection direction (step S9).

  Finally, the press-fitting head 600 is raised, the jig 500 is removed, and the mounting of the press fit connector is completed. FIG. 7G shows a state where the press-fitting head 600 is raised, and FIG. 7G shows a state where the jig 500 is removed. Each arrow indicates the upward direction of the press-fitting head 600 and the removal direction of the jig 500 (steps S10 and S11).

  In this processing flow, pressing is performed from above, but pressing may be performed from both upper and lower sides.

  In this processing flow, one press-fit connector was inserted and then a jig was put on and turned over, and the other press-fit connector was press-fitted, but after inserting a plurality of press-fit connectors, it was turned over. A plurality of press-fit connectors may be press-fitted at the same time.

DESCRIPTION OF SYMBOLS 10 Connector pin 11 Terminal part 12 Press fit part 13 Tip part 14 Connector pin 20 Connector housing 30 Press fit connector 31 Press fit connector 40 Printed circuit board 41 Through hole 100 Connector pin 101 1st surface 102 2nd surface 103 3rd surface Surface 104 Inclined surface 105 Through hole 110 Terminal portion 120 Press fit portion 130 Tip portion 140 Connector pin 150 Connector pin 200 Housing 210 Housing 220 Housing 300 Press fit connector 301 Press fit connector 310 Press fit connector 320 Press fit connector 400 Printed circuit board 410 Through Hole 420 A surface 430 B surface 500 Jig 600 Press-fitting head

Claims (7)

It is a connector pin of a press fit connector that is press-fitted from both sides of the through hole of the printed circuit board,
A terminal section;
A press-fit portion connected to the terminal portion;
A tip portion connected to the press fit portion;
The connector pin, wherein the press fit portion is plastically deformed by a tip portion of a connector pin press-fitted from the opposite side in the through hole, and is press-contacted to an inner peripheral surface of the through hole. The press fit portion has a rectangular cross-sectional shape and includes a first surface and a second surface opposite to the first surface, and a through hole is formed between the first surface and the second surface. The thickness of the thinnest part between the through hole and the second surface is smaller than the thickness of the thinnest part between the through hole and the first surface. Connector pin as described. The connector pin according to claim 2, wherein the shape of the through hole formed in the press fit portion is an ellipse having a major axis in the axial direction of the connector pin. The distal end portion is a plate having a rectangular cross section and includes a surface extending from the first surface, and the thickness between the first surface and the third surface opposite to the first surface is the first thickness. 4. The connector pin according to claim 2, wherein the connector pin is less than or equal to half of a thickness between the first surface and the second surface. 5. The connector pin according to claim 4, wherein an end portion of the tip portion has a chamfered tongue shape. A connector pin having a terminal portion, a press fit portion, and a tip portion, the press fit portion being plastically deformed in the through hole of the printed circuit board and being pressed against the inner peripheral surface of the through hole;
A connector housing,
A press fit connector, wherein a press fit portion and a tip end portion of the connector pin protrude from the connector housing, and each of the plurality of connector pins is arranged in the same direction. A plurality of connector pins having a terminal portion, a press-fit portion that is plastically deformed in the through-hole of the printed circuit board and press-contacted to the inner peripheral surface of the through-hole, and a tip portion are oriented in the same direction on the connector housing. A press-fit connector mounting method for mounting the press-fit connector disposed on both sides of the through hole of the printed circuit board,
A first temporary mounting procedure for inserting a first press-fit connector from one side of the through hole of the printed circuit board;
A second provisional mounting procedure for inserting a second press-fit connector whose direction with respect to the first press-fit connector is 180 degrees from the other side of the through hole of the printed circuit board;
The first press-fit connector and the second press-fit connector are pressed from both sides or one of the sides of the printed circuit board, and plastic deformation is caused in the press-fit portions where the respective tip portions abut. A press-fit connector mounting method comprising the mounting procedure.