JPS6134869A - Electric contacting pin securing structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electrical contact pin, and more particularly to a structure for mechanically fixing the electrical contact pin to a through-hole portion of a printed wiring board.

[Prior art]

Conventionally, in this type of structure, as shown in Fig. 1, it is necessary to control the outer diameter of the press-fit part 2 of the press-fit terminal 3 to provide a tight fit with respect to the inner diameter of the through-hole l. The control of the outer diameter of the press-fitting part 2 is very strict, and it has a very large effect on the production of printed wiring boards and the production yield of the press-fit terminals 3. On the other hand, as shown in Fig. 2, If the press-fit terminals 3 are sub-assembled with the insulator 4, it will be easier to assemble the terminals, and the assembly can be streamlined. becomes difficult.

In addition, when soldering to ensure connection reliability after assembly, the flux used sometimes spreads above the press-fit terminal 3, and if the contact piece is above the contact piece, it may cause poor contact due to contamination. There is.

[Purpose of the invention]

An object of the present invention is to solve such problems, and to improve the manufacturing yield of printed circuit boards and press-fit terminals by increasing the amount of displacement of the press-fitting part that is press-fitted into the through-hole of a printed wiring board. An object of the present invention is to provide an electrical contact pin fixing structure capable of absorbing misalignment of the terminal and wobbling of the tip of the terminal.

[Structure of the invention]

The electrical contact pin fixing structure of the present invention includes an electrical contact pin fixing structure in which an electrical contact pin is inserted and fixed into a through hole, and the electrical contact pin is inserted into the through hole so that the electrical contact pin is inserted into the through hole. A cross section of a plane substantially perpendicular to the direction is V-shaped, a 7-shaped groove is formed on the inner wall thereof substantially parallel to the insertion direction, and one end is movable relative to both ends of the electrical contact pin. The electric contact pin is inserted into the through hole from the one end and pressed to deform the leg and press fit.

〔Example〕 Examples of the present invention will be described in detail below.

FIG. 3 is a perspective view showing an electrical contact pin according to an embodiment of the present invention, FIG. 4 is a plan view showing the electrical contact pin before insertion, and FIG. 5 shows an embodiment of the present invention with the electrical contact pin inserted. FIG.

The press-fitting part of the electrical contact pin is composed of a guide taper part 7 and a V half-section leg part 8, and a figure-7 groove 9 is provided on the inner wall of the V-half-section leg part 8, facing near the bottom of the figure-7. When the electrical contact pin having such a structure is positioned in the through hole and forcefully pressed upward, the guide taper portion 7 is pressed against the inner wall of the through hole, and due to the reaction force from the inner wall of the through hole, the V-shaped cross section leg portion 8 is While curling, it is deformed to the extent that it is press-fitted downward, and finally it is deformed as shown in Fig. 5. In order to reduce the damage caused by the press-fitted part to the inner wall of the through hole during this deformation process, stress is concentrated in the figure 7 groove 9 and the groove depth of the figure 7 groove 9 is adjusted to reduce the stiffness of the V half-section leg part 8. can be done. When press-fitting is complete, the stopper part 10 of the electrical contact pin and the top edge of the printed circuit board should be aligned.
It is also possible to limit the press-fit dimensions by allowing the through-hole land diameter portion ll to abut against each other.

〔Effect of the invention〕

As described above, the present invention provides the lower part of the leg with a tapered part to facilitate deformation of the V half-section leg by continuous repetition of curling, and also appropriately selects the plate material thickness of the contact pin. In addition, the stiffness of the legs can be adjusted by adjusting the depth and position of the 7-shaped groove, increasing the degree of freedom in designing electrical contact pins. The electrical contact pin fixing structure is achieved using a low-stiffness solder connection that is flexible and flexible even when the wire is used, ensuring long-term connection reliability without damaging the printed wiring board.

[Brief explanation of the drawing]

1 and 2 are perspective views showing a conventional example, FIG. 3 is a perspective view showing an electrical contact pin in an embodiment of the present invention, FIG. 4 is a plan view showing the electrical contact pin before insertion, and FIG. The figure is a plan view showing an embodiment of the invention with an electrical contact pin inserted. 7...Guiding taper part, 8...V half-section leg part, 9...7-shaped groove, 10...Part of stopper, 11... ...Through-hole land diameter. \2, -°, l

Claims (1)

[Claims] In an electrical contact pin fixing structure in which an electrical contact pin is inserted and fixed into a through hole, the electrical contact pin has a cross section approximately perpendicular to the insertion direction of the electrical contact pin into the through hole at approximately the center thereof. The electric contact pin has a V-shaped groove formed in its inner wall substantially parallel to the insertion direction, and has one end movable relative to both ends of the electrical contact pin and has a guiding tapered part facing inward. 1. An electric contact pin fixing structure, characterized in that the electric contact pin has a leg portion having a shape, and the electric contact pin is inserted and pressed into the through hole from the one end portion, thereby deforming the leg portion and press-fitting the electric contact pin.