JPS5810391Y2 - Printed circuit board with lug terminals - Google Patents

Description

[Detailed description of the invention] This invention is a printed circuit board with lug terminals, particularly a lug terminal suitable for electromechanically connecting a printed circuit board printed with solder dipping and a lead support fixed to another board. Regarding the structure of

BACKGROUND ART In the assembly structure of communication equipment, etc., a plurality of wiring boards are sub-assembled and then electromechanically coupled to each other to increase the mounting density of attached parts and to reduce the size.

For example, there is a case where printed circuit boards are connected to each other as each wiring board, or a case where a chassis base and a printed circuit board are connected as in a tuner.

Such a bonding structure usually involves inserting and soldering a lead post fixed to one board into a grommet terminal on the other board, or connecting multiple printed circuit boards each with a grommet terminal. It is fixed by soldering using a lead post with a stop terminal inserted through it.

The subassembly of the printed circuit board is soldered using the solder dipping method, and the connection between the lead support and the eyelet terminal is made by hand soldering.

However, in the conventional eyelet terminal structure, when the eyelet terminal is dipped in solder, the eyelet solder may become buried, that is, the hole of the eyelet terminal may become clogged, making it impossible to insert the lead support.

Such solder filling requires a large amount of man-hours to repair, and is a serious hindrance to assembly work.

In particular, when a large number of eyelet terminals are arranged in succession to make the eyelet holes relatively small in diameter, the surface tension of the solder increases, making the holes more likely to become clogged.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved printed circuit board with lugs.

According to the present invention, a lug terminal formed by stamping a metal plate is used in place of the conventional eyelet terminal.

This lug terminal includes a base portion having a through hole formed in the center and a leg portion having a bent tip.

That is, each press piece is separated from a punched body that has been press-formed into a predetermined shape while continuing on a metal sheet plate, and then the opposing legs are bent and the tips of the legs are bent.

Such a metal plate lug terminal is inserted into a through hole of a printed circuit board by elastically deforming both legs, and its tip side is soldered to a conductive land of the printed circuit board by a solder dipping method.

Here, the base of the lug terminal is larger in shape than the through hole to facilitate insertion and attachment of the lug terminal, and to be used together with the bent ends of the legs to temporarily hold the lug terminal on the printed circuit board.

Further, by extending the conductive lands of the printed circuit board only to the portions around the through holes where the leg portions of the lug terminals are located, solder bridges between the conductive lands and clogging of the through holes due to the solder bridges can be prevented.

On the other hand, in another aspect of the present invention, a printed circuit board with lug terminals as described above is electrically and mechanically coupled to a lead support fixed to another board, for example, a feedthrough capacitor lead attached to a shield case. Ru.

The lead support is inserted into the central through hole at the base of the lug terminal and soldered to the lug terminal by hand soldering or the like.

Therefore, a printed circuit board with lug terminals capable of connecting wiring boards with lead supports without being filled with solder can be obtained with a simple structure and assembly work.

In particular, lug terminals have a structure suitable for automation and have great industrial value.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

1 to 3 show a conventional mounting structure for a printed circuit board with eyelet terminals.

In the partial cross-sectional view of FIG.
Although a structure is shown that connects via the lead strut 4
In soldering of the printed circuit board 20 prior to inserting it into the eyelet 1 and fixing it with solder 5, clogging of the eyelet hole becomes a problem.

Normally, the eyelet terminal 1 is located around the entire circumference of the through hole 7 on the conductive land 6 side of the printed circuit board 2 (see Fig. 2), so when the printed circuit board 2 is subjected to solder dipping,
As shown in FIG. 3, there is no solder for the depth in the solder tank 8 in the through hole 7, and the solder is buried therein.

Such a solder-filled eyelet terminal 1 makes it impossible to insert the lead support 4, and therefore cannot be used in the assembly shown in FIG. 1, and must be heated again to remove the solder stuck in the hole.

Additionally, in order to prevent such solder filling, non-solder fillers and solder resists have been used, but this significantly reduces workability and requires additional parts and processes, which increases manufacturing costs. was inviting.

The present invention eliminates the above defects, and its mounting structure is shown in FIGS. 4 to 8.

FIG. 4 shows that a chassis base 30 of a tuner, for example, is connected to the printed circuit board 20 on which the lug terminal 10 according to the present invention is attached, and electricity is supplied via the lead support 32 of a feedthrough capacitor 31 fixed to the chassis base 30. FIG. 3 is a partial cross-sectional view of a mechanically coupled structure.

The lug terminals 10 are attached to the printed circuit board 20 by soldering together with ordinary components mounted on the printed circuit board 20 by a solder dipping method, thereby subassembling the lug terminals 10.

As shown in FIG. 5, the lug terminal 10 consists of a metal plate having a base 12 having a through hole 11 formed in the center and legs 14 having bent tips 13 facing each other.

This lug terminal 10 is preferably made by pressing a metal sheet plate 15 into a predetermined shape as shown in FIG. .

Here, 18 is a hole that facilitates separation.

On the other hand, as shown in FIG. 7, the printed circuit board 20 has a substantially rectangular through hole 21 through which the opposing legs 14 of the lug terminals are inserted, and a conductive land 22 extending around the through hole 21. ing.

By forming the size of the through hole 21 smaller than the size of the base 12 of the lug terminal 10, the lug terminal 10 can be easily inserted into the printed circuit board.

Further, by utilizing the elasticity of the opposing leg portions 14 and the bent tip 13, the lug terminal 10 can be temporarily secured on the printed circuit board 20 until it is fixed by soldering.

Therefore, soldering by the solder dipping method can be reliably achieved.

The important features of the present invention are that the printed circuit board 20 and the lug terminals 1
0 are electromechanically coupled to each other by solder 25,
At this time, as shown in FIG.
By locating the through hole 11 at the base at a position completely unrelated to the solder dipping process, solder filling can be reliably prevented.

Therefore, the lead support 32 shown in FIG.
1 and into the through hole 11 of the lug terminal 10.

Here, the prevention of solder filling is also caused by the fact that the through holes 21 of the printed circuit board 20 can be formed relatively large.

Then, the conductive land 22 of the printed circuit board 20 is connected to the leg tip 13 of the lug terminal 10 in the peripheral portion of the through hole 21.
Extending only the portion where the through hole is located also prevents a solder bridge from being formed across the through hole, and is a particularly preferred structure.

In the mounting structure of multiple circuit boards shown in FIG.
Then, a lead support 32 fixed to another board 30 is fixed to the base of the lug terminal 10 with solder 35.

Therefore, electrical and mechanical coupling between different substrates can be distantly related.

In particular, the structure according to the present invention has the advantage that it is relatively easy to remove each board when it is disassembled for repair or replacement.

Furthermore, the structure according to the present invention greatly reduces the number of soldering steps and improves quality.In addition, it has great practical effects, such as reducing costs by facilitating the automation of mass production of lug terminals.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional view of a conventional printed circuit board with grommet terminals, Figure 2 is a partially enlarged rear view of the printed circuit board shown in Figure 1 before soldering, and Figure 3 is a printed circuit board of Figure 1. 4 is a partial sectional view of the printed circuit board with lug terminals according to the present invention, and FIG.
Figure 6 is an enlarged view of the lug terminal in Figure 5. Figure 6 is a plan view of the punched metal sheet that makes the lug terminal in Figure 5. Figure 7 is an enlarged view of the printed circuit board in Figure 4 before soldering. The rear view and FIG. 8 are cross-sectional views showing the soldering state of the printed circuit board of FIG. 4. 10...Lug terminal, 11...Through hole, 1
2... Base, 13... Leg tip, 14
... Legs, 15 ... Metal sheet plate, 1
6... Punching piece, 20... Printed circuit board, 21... Through hole, 22... Conductive land, 25... Solder, 30・・・・・・(
2nd) board, 32... Lead support, 35...
····solder.

Claims (4)

[Scope of utility model registration request] (1) A metal plate lug terminal with a base with a through hole in the center and legs with bent ends facing each other, and corresponding to the insertion through hole of the opposing legs and the position on the tip side of each leg. A printed circuit board with lug terminals, the base portion being formed larger than the through hole, and the leg portions being soldered to the conductive lands of the printed circuit board. . (2) The printed circuit board with a lug terminal according to claim 1, wherein the conductive land extends only to a peripheral portion of the through hole where the leg portion of the lug terminal is located. (3) The lug terminal is registered as a utility model in which a punched piece press-formed into a predetermined shape is cut off while connected to a metal sheet plate, the leg portions are bent and inserted into the through holes of the printed circuit board. A printed circuit board with lug terminals according to claim 1 or 2. (4) The lug terminal is electrically and mechanically connected to each other by inserting a lead post attached and fixed to another board into the through-hole at the base of the lug terminal, as claimed in any one of claims 1 to 3. Printed circuit board with lug terminals.