JPH0615426Y2 - Fixing structure of connector on printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a connector fixing structure for a printed circuit board, which is formed by performing printed wiring on a circuit board using copper foil or the like.

[Problems to be Solved by Prior Art and Invention] Conventionally, when fixing a connector to a printed circuit board of this type, the connector was directly placed on the printed circuit board and fixed using screws or the like. However, since the printed circuit board and the connector case have different coefficients of thermal expansion, when the connector is fixed to the printed circuit board with printed wiring on both front and back sides, the friction between the printed circuit board and the connector due to thermal changes causes There is a risk that the printed wiring will be cut, and in this case, malfunction will occur and reliability will become a problem.

Therefore, it is also proposed that a spacer is interposed between the connector and the printed wiring so that the connector and the printed circuit board do not come into direct contact with each other. In this case, however, the spacer and the printed circuit board come into contact with each other. As a result, the same problem of cutting the printed wiring at the sharp edge portion of the spacer end portion occurs.

[Means for Solving the Problems] The present invention was devised with the object of providing a connector fixing structure for a printed circuit board that can eliminate these drawbacks in view of the above circumstances. When fixing the connector to a printed circuit board with printed wiring on both front and back sides, it is insulating between the printed circuit board and the connector to protect the printed wiring that faces the edge of the connector, and it is larger than the bottom surface of the connector. It is set and the peripheral edge protruding from the bottom of the connector is R
It is characterized by interposing spacers which are lifted from the printed circuit board at the edges.

According to the present invention, it is possible to reliably prevent the cut of the printed wiring due to the rubbing of the connector and the printed circuit board, and to significantly improve the reliability.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a printed circuit board, which is formed by providing printed wirings 1b made of copper foil on both front and back surfaces of a substrate 1a made of an insulating resin material.

On the other hand, 2 is a connector, and the connector 2 comprises a case 2a, a base portion 2b of the case 2a, a connector pin 2c protruding upward from the base portion 2b, a lead pin 2d protruding downward from the base portion 2b, and the like. The connector 2 is fixed to the printed circuit board 1 with the screw 3, and the lead pin 2d inserted into the insertion hole 1c of the printed circuit board 1 is soldered 4 to the printed wiring 1b. The process is performed by immersing the printed circuit board 1 to which the connector 2 is fixed in molten solder. That is, the melted solder is repelled by the substrate 1a and adheres only to the printed wiring 1b so that the required soldering 4 is performed.

Further, 5 is a spacer interposed between the connector 2 and the printed circuit board 1. The spacer 5 is an insulating member and is formed in a flat plate shape so that the vertical and horizontal dimensions are larger than the bottom surface of the connector 2, and the upper surface is formed. Is contacted with the lower end of the case 2a of the connector 2 and the lower surface thereof is contacted with the printed wiring 1b or the substrate 1a, and the peripheral portion 5a of the spacer 5 is screwed in the assembled state. By tightening 3, the lower surface is curved upward so that the lower surface becomes R-shaped. Further, 5b is an insertion hole formed in the spacer 5 corresponding to the position of the lead pin 2d of the connector 2, but the insertion hole 5b has a larger diameter than the insertion hole 1c. As the insulating member forming the spacer 5, a member that does not impair its function even when the solder melting temperature is exceeded is used.

In the embodiment of the present invention configured as described above, when the connector 2 (case 2a) and the printed circuit board 1 expand (shrink) due to temperature change, the intervening spacer 5 absorbs the expansion difference between the two. Therefore, like the conventional one in which the connector 2 is directly fixed to the printed circuit board 1, a difference in expansion between the connector 2 and the printed circuit board 1 due to temperature change causes the two to rub against each other and cut the printed wiring 1b. There is no. As a result, it is possible to reliably prevent a malfunction due to the cutting of the printed wiring 1b, and it is possible to significantly improve reliability.

Even if the provisional spacer 5 moves with respect to the printed circuit board 1 due to the difference in expansion, the peripheral edge portion 5a protruding from the bottom surface of the connector 2 is lifted with an R-shaped lower surface, and the end edge of the spacer 5 is lifted. Since it is effectively avoided that the printed wiring 1b comes into contact with the printed wiring 1b, the printed wiring 1b is not cut by the edge of the spacer 5.

Further, in this embodiment, during the soldering step,
Since the large-diameter through hole 5b functions as an air hole, the solder 4 can penetrate into the through hole 1c of the printed circuit board 1 and the connection between the lead pin 2d and the printed wiring 1b can be strengthened.

Of course, the present invention is not limited to the above-mentioned embodiment, and for example, the peripheral portion 5a of the spacer 5 is
Instead of being deformed by tightening the screws 3,
As shown in the figure, it may be formed in a curved shape in advance,
Further, in this case, only the lower surface may be formed into the R shape without forming the entire peripheral portion 5a in a curved shape.

[Effects] In summary, since the present invention is configured as described above, even if the fixed connector and the printed circuit board expand (contract) due to thermal change, the expansion difference between the two is absorbed by the intervening spacer. Therefore, unlike the conventional one, there is no problem that the directly fixed connector rubs against the printed circuit board to cut the printed wiring.

Then, the spacer comes into contact with the printed circuit board, but the peripheral edge portion protruding from the connector of the spacer is raised in an R shape so that the spacer edge does not come into direct contact with the printed circuit board. Therefore, even if the spacer moves with respect to the printed circuit board due to the difference in expansion, there is no fear that the spacer edge directly contacts the printed circuit and cuts the printed circuit. Malfunction due to disconnection of wiring can be reliably prevented, and reliability can be significantly improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a connector fixing structure for a printed circuit board according to the present invention. FIG. 1 is a plan view of a printed circuit board provided with a connector, FIG. FIG. 4 is a sectional view of a main part of the same as above, FIG. 4 is an exploded perspective view of the same as above, and FIG. 5 is a perspective view of the same as another example. In the figure, 1 is a printed circuit board, 1b is a printed wiring, 2 is a connector, 5 is a spacer, and 5a is a peripheral portion.

Claims (1)

[Scope of utility model registration request] 1. When fixing a connector to a printed circuit board having printed wiring on both front and back sides, it is insulating between the printed circuit board and the connector so as to protect the printed wiring facing the edge portion of the connector, and A fixing structure for a connector on a printed board, wherein the connector is set to be larger than the bottom surface of the connector, and a peripheral portion protruding from the bottom surface of the connector has an R shape, and an end edge is interposed with a spacer that is lifted from the printed board.