JP4492799B2 - Press fit pin - Google Patents

Description

  The present invention relates to a press-fit pin for fixing a connection terminal to an electronic board without using solder.

  The press-fit pin is a pin that can mount an electronic component such as a connector on a board without using solder, and is used in various electronic devices such as a computer board. In many cases, a press-fit pin is mounted on a substrate by holding the press-fit pin with a robot arm or the like and press-fitting it into the substrate. Since the press-fit pin is attached to the board by press-fitting in this way, if the elastic force of the press-fit pin, that is, the frictional force between the press-fit pin and the board side through hole is insufficient, it is inserted by vibration or impact after installation. The press-fit pin comes off the substrate in the direction opposite to the direction. Therefore, in Japanese Patent Application Laid-Open No. 2003-346950 and Japanese Patent Application Laid-Open No. 2003-346951, by increasing the ground contact area inside the through hole, it is difficult to remove the press fit pin, and the fixing force in the through hole radial direction is increased. Yes.

In addition, if the elastic force of the press-fit pin is too strong, a large pressure input is required for mounting, so that the substrate and the press-fit pin are damaged at the time of press-fitting. Japanese Patent Application Laid-Open No. 07-245131 proposes a shape that prevents the press-fit pin and the through hole from being broken due to manufacturing tolerances.
JP 2003-346950 A JP 2003-346951 A JP 07-245131 A

  In the prior art, various shape devices and high component dimensional accuracy are required in consideration of the balance between the holding force for holding the press-fit pins fixed to the substrate and the damage to the substrate. For example, the pin shapes proposed in Japanese Patent Application Laid-Open Nos. 2003-346950 and 2003-346951 are complicated, and high component dimensional accuracy is required to prevent breakage of the substrate and press-fit pins. In Japanese Patent Application Laid-Open No. 07-245131, the shape of the elastic portion is devised so as not to require high component dimensional accuracy. As described above, the prior art does not prevent the removal in the direction opposite to the insertion direction.

  Accordingly, it is an object of the present invention to provide a press-fit pin having a holding force that reliably prevents at least removal in the direction opposite to the insertion in the state of being inserted on the substrate.

In order to solve the above-described problem, the press-fit pin according to claim 1 is a press-fit pin inserted into the through hole 18 provided in the substrate 17, and the press-fit pin is inserted into the through hole 18 at the head. Elasticity in a direction perpendicular to the insertion direction of the press-fit pin, located between the introduction part 16 on the end part, the connection part 12 on the end part side opposite to the introduction part 16, and the connection part 12 and the introduction part 16 And a claw portion 15 provided outside the elastic portion 13, and the claw portion 15 comes out at least in the direction opposite to the insertion direction when the press-fit pin is inserted into the substrate 17. as a stopper function to prevent the bulge from the introduction part 16 the direction toward the connecting portion 12 direction, has a difference in the connection portions 12 direction, plated on insertion into the surface of the claw portion 15 Provided with a strong hard plating 51 on the friction that can prevent les than the hard plating 51 so that the inner wall and sufficient electrical connection allows the through hole 18 on the surface of the upper elastic portion 13 from the claw portion 15 energized It is characterized by having a plating with good characteristics.

In addition to the claw portion 15, the press-fit pin according to claim 2 has a thickness of the substrate 17 with respect to the claw portion 15 with a second claw portion 41 that prevents the claw portion 15 from coming off in the insertion direction. It is characterized in that it is provided on the side of the connecting portion 12 with the above interval.

  The press-fit pin according to claim 3 extends from the connection portion 12 (first portion) connected to the connector 11 and the connection portion 12, and has an elastic force in a direction perpendicular to the extending direction. The elastic portion 13 provided in this way, the introduction portion 16 (second portion) extending from the elastic portion 13, and substantially perpendicular to the extending direction protruding outward in the vertical direction in the elastic portion 13 The connector 11 has a flat surface, and includes a claw portion 15 that is formed with a substantially continuous gradient from the leading end of the flat surface to the introduction portion 16.

  The press-fit pin according to claim 4, in addition to the claw portion 15, protrudes outward in the vertical direction from the boundary between the connection portion 12 and the elastic portion 13 to the claw portion 15 in the elastic portion 13. A second claw portion 41 having a plane on the introduction portion 16 side substantially perpendicular to the opposite direction of the extending is provided.

  The press-fit pin according to claim 5 is characterized in that at least the claw portion 15 is provided with a hard plating, and at least the elastic portion 13 is provided with a plating having better current-carrying characteristics than the hard plating.

  Hereinafter, the best mode for carrying out the present invention will be described using Examples 1 to 3.

[Example 1]
In the present embodiment, description will be made with reference to FIGS. FIG. 1 is an external view of the press-fit pin 1, and hereinafter, the upper direction of the drawing is the upper direction of the press-fit pin 1 and the lower direction of the drawing is the lower direction of the press-fit pin 1. The press-fit pin 1 includes a connection part 12, an elastic part 13, a claw part 15, and an introduction part 16. A connector 11 is connected to the upper end of the connecting portion 12. The elastic portion 13 includes a punching hole 14 and has elasticity in a direction orthogonal to the insertion direction. Further, the press-fit pin 1 is inserted into the through hole 18 of the substrate 17 from the upper side of the drawing to the lower side of the drawing with the introduction portion 16 at the top. As shown in the hatched pattern region of FIG. 1, the through hole 18 has a conductive portion 19. The connecting portion 12, the elastic portion 13, the claw portion 15, and the introducing portion 16 are formed of the same conductive material, and the elastic portion 13 is electrically connected to the through hole 18 when the press-fit pin 1 is inserted into the through hole 18. Connected to. The direction in which the press-fit pin 1 is pulled out is the direction opposite to the insertion direction, that is, the direction from the lower side of the drawing to the upper side of the drawing.

The specifications of the press-fit pin 1 will be described with reference to FIG. 2A is a front view of the press-fit pin 1, and the right view of FIG. 2A is a side view of the press-fit pin 1. 2B is a cross section taken along line AA of the elastic portion 13, FIG. 2C is a cross section taken along line BB of the elastic portion 13 and the claw portion 15, and FIG. The cross section in the C line is shown. As shown in FIG. 2A, the elastic portion 13 swells from the direction of the introduction portion 16 to the middle of the elastic portion 13 and from the direction of the connecting portion 12 to the middle of the elastic portion 13, and is a direction perpendicular to the insertion direction. The punching hole 14 is provided in the center so as to have elasticity in the horizontal direction of the drawing. A portion of the punched hole 14 that exists in the horizontal direction of the drawing is referred to as an elastic portion 13. The width of the elastic portion 13 including the punched hole 14 is larger than the diameter of the through hole 18.

  2 (a) and 2 (c), the claw portion 15 is located at the outermost diameter of the elastic portion 13 in the horizontal direction of the drawing, and swells from the introduction portion 16 direction to the connection portion 12 direction. The head of the elastic part 13 has a head in the direction of the connecting part 12. The introduction part 16 is smaller than the diameter of the through hole 18 and has a thin tip for easy insertion.

  The flow of inserting and fixing the press-fit pin 1 will be described with reference to FIG. As shown in FIG. 3A, the elastic portion 13 and the claw portion 15 are wider than the inner diameter of the through hole 18 when no external force is applied by the through hole 18 of the substrate 17. When a force is applied from the upper side to the lower side of the drawing from the state shown in FIG. 3A, the punching hole 14 is narrowed as shown in FIG. Pin 1 is inserted. When the press-fit pin 1 is inserted to the state shown in FIG. 3C, the claw portion 15 spreads along the substrate 17 and cannot be pulled out in the direction opposite to that at the time of insertion, that is, upward in the drawing.

  Thereby, the invented press-fit pin 1 includes the claw portion 15 on the outermost diameter of the elastic portion 13 so that the press-fit pin 1 can be easily inserted and the claw portion is in a state where the pin is inserted into the substrate. 15 is prevented from coming off in the direction opposite to the insertion direction. The width of the outermost diameter of the claw portion 15 is equal to or smaller than the inner diameter of the through hole 18 when an external force is applied by the through hole 18 of the substrate 17, and is equal to or larger than the inner diameter of the through hole 18 when spread along the substrate 17. It is sufficient to satisfy the part dimensions to be In order for the elastic part 13 to obtain a sufficient holding force when the elastic part 13 is electrically connected to the inner wall of the through hole 18, the elastic part 13 only needs to satisfy a component size that is equal to or larger than the inner diameter of the through hole 18 when no external force is applied. . That is, this press fit pin 1 does not require high component dimensional accuracy.

  Furthermore, since it is not necessary to fix the press-fit pin 1 to the substrate 17 only by the frictional force generated between the inner wall of the through hole 18 and the elastic part 13 due to the elastic force as in the prior art, the elastic force required for the elastic part 13 is not required. Therefore, it is sufficient to consider electrical connection as a main point, and an elastic force smaller than that of the prior art is sufficient. For this reason, damage to both the substrate 17 and the press-fit pin 1 can also be prevented.

[Example 2]
Example 2 will be described with reference to FIG. In the first embodiment, the claw portion 15 exists only on the introduction portion 16 side of the elastic portion 13. As shown in FIG. 4, in addition to the claw portion 15 of the first embodiment, in the second embodiment, claw portions are provided on the connection portion 12 side of the elastic portion 13, that is, both ends of the elastic portion 13. A claw portion on the connection portion 12 side of the elastic portion 13 is referred to as a second claw portion 41. By providing the second claw portion 41 in this manner, in addition to the operational effects obtained in the first embodiment, the press-fit pin 1 exhibits a sufficient holding force in the vertical direction of the substrate 17 after insertion. Can do. Further, it is possible to prevent excessive insertion during insertion.

Example 3
Example 3 will be described with reference to FIG. In Example 1, all the surfaces of the connection part 12, the elastic part 13, the claw part 15, and the introduction part 16 were plated with the same conductive material. In the present embodiment, plating with good current-carrying characteristics, such as tin plating or gold plating, is used for the elastic portion 13 above the claw portion 15 in the drawing direction. When the press-fit pin 1 is inserted, it rubs against the entrance and the inner wall of the through-hole 18, so that the elastic portion 13 below the claw portion 15 in the drawing direction (lattice pattern region in FIG. 5) Use nickel plating. Thereby, in addition to the effect obtained in the said Example 1, it can prevent that the nail | claw part 15 peels at the time of insertion. In addition, after insertion, the portion of the elastic portion 13 that uses plating with good current-carrying characteristics contacts the inner wall of the through hole 18, so that sufficient electrical connection is possible.

[Other Examples]
In the above-described embodiment, the punching hole is provided in the middle of the elastic portion 13. However, since the elastic portion only needs to have a shape having elasticity, for example, the elastic portion may have a cross section of an n-type or a v-type.

  In the third embodiment, hard plating is used only for the claw portion 15, but the introduction portion 16 and the connection portion 12 may be subjected to hard plating. Similarly, in addition to the elastic portion 13, the introduction portion 16 and the connecting portion 12 may be plated with good energization characteristics.

  The angle formed between the surface of the claw portion 15 in contact with the substrate 17 in FIG. 2 and FIG. 4 and the elastic portion 13 in contact with the inner wall of the through hole 18 is the state where the press-fit pin 1 is inserted into the substrate 17. As long as the nail | claw part 15 is a shape which fulfill | performs the function of a stopper, an acute angle and an obtuse angle may be sufficient.

It is a schematic diagram of a press fit pin and a substrate used in Example 1. It is the front view, side view, and sectional view of a press-fit pin used in Example 1. It is a figure showing the flow which inserts the press fit pin used in Example 1 into a board | substrate. It is a figure showing the flow which inserts the press fit pin used in Example 2 into a board | substrate. It is a figure showing the flow which inserts the press fit pin used in Example 3 into a board | substrate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press fit pin 11 Connector 12 Connection part 13 Elastic part 14 Punching hole 15 Claw part 16 Introduction part 17 Board | substrate 18 Through hole 19 Conductive part 41 2nd nail | claw part 51 Hard plating

Claims (2)

In a press-fit pin inserted into a through hole 18 provided in the substrate 17,
The press-fit pins include an introduction portion 16 on the end portion side inserted into the through hole 18 at the head, a connection portion 12 on the end portion side opposite to the introduction portion 16, the connection portion 12, and the introduction portion 16. And an elastic part 13 provided with elasticity in a direction perpendicular to the insertion direction of the press-fit pin, and a claw part 15 provided outside the elastic part 13,
The claw portion 15 swells from the introduction portion 16 direction to the connection portion 12 direction as a stopper function for preventing the claw portion 15 from coming off at least in the direction opposite to the insertion direction when the press-fit pin is inserted into the substrate 17. , Having a drop in the direction of the connecting portion 12,
With plating during insertion into the surface of the pawl portion 15 is provided with a strong hard plating 51 on the friction that can prevent peeling, the inner wall and sufficient electrical said from the pawl portion 15 on the surface of the upper portion of the elastic portion 13 through hole 18 A press-fit pin comprising a plating having better current-carrying characteristics than the hard plating 51 so that connection is possible.   In addition to the claw portion 15, a second claw portion 41 that prevents the claw portion 15 from coming off in the insertion direction when inserted into the substrate 17 is spaced from the claw portion 15 by a distance greater than the thickness of the substrate 17. The press fit pin according to claim 1, wherein the press fit pin is provided on the side of the connecting portion 12.

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