JPH054247Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a variable resistor of the type that is dip soldered to a printed circuit board.

[Conventional technology]

Figures 3 to 5 are explanatory diagrams of conventional examples. Figure 3 is a perspective view of a variable resistor, Figure 4 is an exploded perspective view of the same, and Figure 5 is a perspective view of a base for mounting a resistor. be.

In FIG. 3, reference numeral 1 denotes a base for mounting a resistor formed by molding, and a recess 2 is provided in the center, and horse-clamp-shaped resistors 3 and 4 are provided on the bottom surface of the recess 2. 5 and 6 are terminals at both ends of the outer resistor 3;
Reference numerals 7 and 8 denote terminals at both ends of the inner resistor 4. Each of the terminals 5, 6, 7, and 8 is buried in the base 1, and the terminals protrude outward from the lower surface 1a of the base 1. 9 is a rotating shaft; 10 is a slider receiver integrated with the shaft 9; on one surface of the slider receiver 10 is fixed a slider (not shown) that makes sliding contact with the resistors 3 and 4; 11 is a case made of a metal plate, and 12 is a recess provided on the surface 1b of the base 1 near the terminals 5, 6, 7, and 8 for storing flux. 13 is a spring plate;
A spring 13a biases the slider receiver 10 toward the resistors 3 and 4, and a stopper 13 engages with the rotation regulating convex portion 14 of the slider receiver 10 to regulate the rotation range of the shaft 9.
b is integrally formed.

As for each of the above-mentioned parts, the slider receiver 10 is housed in the recess 2 of the base 1, the spring plate 13 and the case 11 are placed over the base 1, and the ends of the legs 15 of the case are folded onto the back surface of the base 1. It is assembled by bending as shown in FIG.

[Problem that the invention attempts to solve]

However, in order to attach a variable resistor as shown in Fig. 3 to a printed circuit board, each terminal 5, 6, 7, 8
After inserting the legs 18 of the case 11 into the holes of the printed circuit board, fix the back side with dip solder.
Flux that adheres to the surface of the base 1 and tries to invade the inside of the resistor through capillary action from the contact area between the base 1 and the case 11 is supposed to accumulate in the recess 12 provided on the surface of the base 1. The disadvantage is that the flux overflows from the recess 12 and enters the resistor, causing malfunction of the variable resistor. The present invention aims to solve the above-mentioned conventional drawbacks, and an object of the present invention is to prevent flux from entering the inside of a resistor during dip soldering.

[Means to resolve the problem]

In order to achieve the above-mentioned objects, the present invention provides a recess in a base for mounting a resistor formed by molding, etc., a resistor is provided on the bottom of the recess, and a terminal connected to the resistor is connected to the base. In a variable resistor that is embedded in the lower surface of the base and has a recess for storing flux on the surface of the base near the terminal, the resistor communicates with the recess for storing flux on at least one of the left and right side surfaces of the base. The structure includes an escape groove that allows the flux to flow out of the base, and a groove that crosses the outer surface of the base that prevents the flux from rising.

[Effect]

According to the above-described embodiment of the present invention, during dip soldering of a variable resistor, the flux accumulated in the concave portion for accumulating flux flows out of the resistor through the escape groove, so that the flux does not enter the inside of the resistor. Therefore, the variable resistor will not malfunction due to flux.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention,
FIG. 1 is a perspective view of a variable resistor, and FIG. 2 is a perspective view of a base for mounting a resistor.

Note that the same parts as those of the conventional example shown in FIGS. 3 to 5 are given the same reference numerals, and redundant explanation will be omitted.

The difference between the present invention and the conventional example is that there are flux relief grooves 1 on the left and right side surfaces 1c and 1d of the base 1 for mounting the resistor, which communicate with the recess 12 for storing flux.
6, and a groove 17 that is connected to the recess 12 and the relief groove 16 and that crosses the side surfaces 1c and 1d of the base 1 is formed.

According to the present invention, the terminals 5, 6 of the variable resistor,
When dip-soldering 7 and 8, the flux is led out through the relief groove 16 before the concave part 12 is full, so the flux does not overflow from the concave part 12, and therefore the variable resistance due to the flux is reduced. It is possible to prevent malfunction of the device.

Further, grooves 17 are formed on the left and right side surfaces 1c and 1d of the base 1, which are connected to the recess 12 for storing flux and the relief groove 16, and which cross the left and right side surfaces 1c and 1d of the base 1. Therefore, the flux that creeps up by capillary action from the lower part of the side surfaces 1c and 1d of the base 1 that the case 11 comes into contact with is prevented from rising any further by the groove 17, and does not reach the inside of the resistor. Further, the flux accumulated in the groove 17 flows out of the resistor from one end of the groove 17 or the relief groove 16 described above. As described above, the flux that creeps up due to capillary action at the contact area between the base 1 and the case 11 is prevented from entering the inside of the resistor by the recess 12 and groove 17 that collect the flux, and is kept at the same place. The accumulated flux flows out through the escape groove 16, so
Even when a large amount of flux is used, the penetration of flux into the interior of the resistor is sufficiently prevented.

In the above embodiment, the escape grooves 16 were provided at both ends of the recess 12 for storing flux.
Either one may be used, or the function of the escape groove 16 may be provided at the end of the groove 17 on the side that is not connected to the recess 12 instead of the end of the recess 12 that stores the flux. In the latter case, the groove 17 must be provided further down to allow the flux accumulated in the recess 12 to flow out from the end of the groove 17 before overflowing into the resistor.

[Effect of idea]

According to the present invention, when dip-soldering the terminals of a variable resistor, the flux accumulated in the recess where flux accumulates is led out to the outside by the relief groove before it becomes full, so that the flux accumulates in the recess. It does not overflow from the recess, and therefore it is possible to prevent malfunction of the variable resistor due to flux.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Figure 1 is a perspective view of a variable resistor, Figure 2 is a perspective view of a base for mounting a resistor, Figures 3 to 5 are explanatory diagrams of conventional examples, and Figure 3 is a perspective view of the variable resistor. FIG. 4 is an exploded perspective view, and FIG. 5 is a perspective view of a base for mounting a resistor. 1... Base for mounting the resistor, 2... Recess, 3,
4...Resistor, 5, 6, 7, 8...Terminal, 12...
...Flux accumulating recess, 16... Relief groove, 1
7...Groove.

Claims (1)

[Scope of utility model registration request] A recessed portion is provided in a base for mounting a resistor formed by molding or the like, a resistor is provided on the bottom surface of the recessed portion, a terminal to be connected to the resistor is buried in the lower surface of the base, and the In a variable resistor having a recess for storing flux on the surface of the base, an escape groove on at least one of the left and right side surfaces of the base communicates with the recess for storing flux and causes the flux to flow out of the base; A variable resistor characterized in that a groove is formed across the outer surface of the base to prevent flux from rising.