JPH054249Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a variable resistor, and particularly to the structure of a terminal fixing portion of a surface-mounted variable resistor.

(Prior art) Regarding the variable resistor conventionally adopted as a surface mount type, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9 A, B, and FIG. The following description will be made with reference to a schematic perspective view of a variable resistor.

FIG. 5 is a perspective view of a conventional variable resistor, in which a shaft 12 is provided protruding from the upper surface 1a of a prismatic hexahedral case 1 made of molded plastic material. code 1
b indicates a bottom surface (see FIG. 6) opposite to the top surface 1a, and reference numeral 1c indicates a side surface.

4 and 8, an arcuate resistor 18, resistor electrode plates 17a and 17c, and an arcuate resistor 18 are placed on the surface of an insulating substrate 16 housed inside the case 1 made of molded plastic material. The central electrode plate 17b and the like located approximately at the center are formed by a thick film printing and firing process. L-shaped curved terminals 2a, 2c are connected to the resistor electrode plates 17a, 17c through through holes provided in the insulating substrate 16, respectively.
are electrically welded, and these L-shaped curved terminals 2
a, 2c are attached to the side surface 1c of the case 1 using adhesive 4.
The terminals 2a, 2c are fixed in the case 1 on the opposite side, and the ends of the terminals 2a, 2c protrude from the grooves 3a, 3c provided in the bottom surface 1b of the case 1, and the ends are pressed. In this example, a substantially U-shaped curved terminal 2b is inserted into a hole 20 (eighth hole) formed in an insulating substrate.
Bottom surface 1 to form a U-shaped curvature through
It is inserted into the groove 3b provided in the curved terminal 2b, and is caused to protrude from the case side surface 1c to the end of the curved terminal 2b. The U-shaped curved terminal 2b is fixed in the groove 3b by an adhesive 4 filled on the side surface facing the case side surface 1c. Further, a rotor 13 in which a slider 15 and an elastic body 14 are accommodated in a recess is disposed so as to be able to contact the surface of an arcuate resistor 18 formed on an insulating substrate 16, and a shaft 12 for driving the rotor 13 is provided. .

In the variable resistor described above, the terminals 2a, 2c,
There are various ways to fix 2b, but the most widely used methods are shown in Figures 5 to 7 and Figures 9A and B.
Explain with reference to. FIG. 6 is a perspective view of the variable resistor of FIG. 5 viewed from another direction. FIG. 7 is a sectional view taken along line A--A in FIG. 6.

A conventional terminal fixing method for a surface-mounted variable resistor is as follows. L-shaped curved terminals 2a, 2c
is inserted and fixed into the terminal insertion grooves 3a and 3c provided on the bottom surface 1b of the case 1 by filling the side surface facing the side surface 1c of the case 1 with adhesive. The portions of the terminal insertion grooves 3a, 3c into which the terminals 2a, 2c are inserted are angular.

On the other hand, the U-shaped curved terminal 2b connected to the central electrode plate 17b is inserted into the hole 20 of the insulating substrate 16, and inserted into the insertion groove 3b cut out in a concave shape across the bottom surface 1b and side surface 1c of the case. Case side 1c
It is fixed to the insertion groove 3b by the adhesive 4 filled on the side facing the . The end portion of the U-shaped curved terminal 2b protrudes from the side surface 1c.

(Problems to be Solved by the Invention) The conventional terminal fixing method described above has the following problems with respect to the U-shaped curved terminal 2b.

(1) The U-shaped curved terminal 2b is inserted into the insertion groove 3b using adhesive 4.
However, since there is a gap between the insertion groove 3b and the terminal 2b due to the structure, the insertion groove 3a,
L-shaped terminals 2a, each inserted and fixed into 3c,
The dimensional accuracy between the terminals with 2c cannot be set sufficiently.

(2) Also, as shown in FIG. 9A, place a piece of the U-shaped curved terminal 2b in the concave terminal insertion groove 3b using an adhesive 4.
If the terminal 2b is fixed in place, one piece of the terminal 2b tends to float and be displaced, resulting in poor workability.

(3) Adhesive 4 is used to fix the terminal, but there is a limit to its usage, and with the conventional structure, it is impossible to further improve the adhesive peel strength of the U-shaped curved terminal 2b. be.

(4) Also, if the accuracy of adhesive 4 is low, please refer to Fig. 9B.
As shown in the figure, the adhesive 4 flows out from the case 1, resulting in a poor appearance.

(Means for Solving the Problems) Therefore, the present invention was devised for the purpose of solving the above-mentioned problems, and below, means for achieving the purpose will be provided. The description will be made using the reference numerals used in the accompanying drawings used in the description of the embodiments.

Electrode plates 17 provided at both ends of the horseshoe-shaped resistor 18
L-shaped curved terminal 2 connected to a and 17c, respectively
a, 2c, a U-shaped curved terminal 2b connected to a central electrode plate 17b provided approximately at the center of the horseshoe-shaped resistor 18, a rotor 13 that can freely slide on the horseshoe-shaped resistor 18, and this rotor. 13 drive shaft 1
2, in which the terminals 2a, 2b, 2c are adhesively fixed to the case 1, the terminal insertion groove 6 provided in the center of the bottom surface 1b of the case 1 has a tapered portion 9 slightly inclined in a part of the terminal insertion groove 6. Filling section 8 consisting of
furthermore, the end insertion groove 6 and the case side surface 1c are provided.
A terminal fixing hole 7 is bored so as to communicate with the terminal inserting groove 6 and the terminal fixing hole 7, and the end of the U-shaped curved terminal 2b inserted into the terminal insertion groove 6 and the terminal fixing hole 7 protrudes from the case side surface 1c. It is a variable resistor.

(Function) According to the present invention, the terminal fixing through hole 7 (hereinafter simply referred to as the terminal fixing hole 7) is provided in the side surface 1c of the case 1, and is configured to penetrate through the terminal insertion groove 6. The fixing hole 7 is connected to the U-shaped curved terminal 2b.
Terminals 2a and 2
The dimensional accuracy between terminals 2b and 2c can be improved, and the positioning of the terminal fixing hole 7 also prevents the U-shaped curved terminal 2b from rising above the bottom surface 1b of the case 1. There is.

Further, by appropriately selecting the inner diameter of the terminal fixing hole 7 with respect to the outer diameter of the U-shaped curved terminal 2b, an effect of suppressing the outflow of the adhesive 4 to the side surface 1c can be expected.

Furthermore, by providing a built-up part 8 in a part of the terminal insertion groove 6, it works to hold the U-shaped curved terminal 2b, so it is easier to peel off the adhesive of the terminal than with the conventional method using only adhesive. Strength can be increased.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a perspective view of the terminal fixing portion seen from another direction. FIG. 3 shows a sectional view taken along line B--B in FIG. 2.

Since the same reference numerals as those already used in the description of the conventional example represent the same members, detailed explanation thereof will be omitted.

In the present invention, as shown in FIG. 2, a concave U-shaped curved terminal insertion groove 6 is provided on the bottom surface 1b of the case 1, and a built-up portion 8 is provided to partially close the groove. Further, in order to fix the U-shaped curved terminal 2b connected to the center electrode plate 17b, the side surface 1c of the case 1 has a width narrower than the terminal insertion groove 6.
A terminal fixing hole 7 having an inner diameter slightly larger than the outer diameter of the terminal 2b is configured to pass through the padded portion 8 from the terminal insertion groove 6 and open to the side surface 1c.

Further, the lower portion of the built-up portion 8 is provided with a slightly inclined taper portion 9 in order to facilitate insertion of the U-shaped curved terminal 2b.

Next, when assembling this variable resistor, the rotor 13, the rubber elastic body 14, and the slider 1 are placed inside the case 1.
5 are stored in order, and the terminals 2a, 2b,
2c is bent into an L-shape or U-shape as shown in FIG. 4, FIG. 8, and FIG. It is assembled and fixed with adhesive 4.

At the time of this assembly, connect the U-shaped curved terminal 2b to the case 1.
The L-shaped curved terminal 2a, is inserted along the terminal insertion groove 6 formed on the bottom surface 1b of the L-shaped curved terminal 2a.
2c is also inserted into the grooves 3a, 3c provided in the case bottom 1b, and is adhesively fixed in the case 1 with the adhesive 4 filled together with the U-shaped curved terminal 2b inserted into the terminal fixing hole 7 as described above.

According to the present invention, the terminal fixing hole 7 for fixing the U-shaped curved terminal 2b is provided in the side surface 1c of the case 1, and the terminal insertion groove 6 and the case side surface 1c are configured to penetrate. , since the U-shaped curved terminal 2b is positioned on the side surface 1c of the case 1 through the terminal fixing hole 7, the terminal 2b is positioned on the side surface 1c of the case 1.
The dimensional accuracy between a and the terminal 2b and between the terminal 2b and the terminal 2c can be improved.

Furthermore, as shown in FIG. 9A, the conventional U-shaped curved terminal 2b had a problem in that it rose above the bottom surface 1b of the case 1 from the terminal insertion groove 3b. Since it is regulated, it is possible to prevent the U-shaped curved terminal 2b from floating.

Further, by providing a built-up portion 8 in a part of the terminal insertion groove 6, the adhesive peel strength of the U-shaped curved terminal 2b can be improved compared to using only the conventional adhesive 4.

In addition, conventionally, as shown in FIG. 9B, the terminal insertion groove 3
Although it was not possible to prevent the adhesive 4 from flowing out to the side surface of the case 1 in b due to the gap between the U-shaped curved terminal 2b and the terminal insertion groove 3b, in the present invention, the inner diameter dimension of the terminal fixing hole 7 By appropriately selecting the outer diameter of the U-shaped curved terminal 2b, it is possible to suppress the flow of the adhesive 4 and prevent it from flowing out, as shown in FIG.

Furthermore, by providing a tapered portion 9 on the lower surface of the built-up portion 8 on the bottom surface 1b of the case 1, insertion of the U-shaped curved terminal 2b is facilitated, and workability can be improved.

(Effect of the invention) As explained above, according to the invention, a part of the padded part of the terminal insertion groove is provided on the bottom of the case, a terminal fixing hole is provided on the side surface, and the padded part and the terminal insertion groove are provided on the side surface. Since it is configured to penetrate through the groove, (1) the accuracy of the dimension between the terminals is improved;

(2) The positioning and holding action of the terminal by the terminal fixing hole can prevent the terminal from lifting up.

(3) Since the terminal is reinforced by providing the built-up part in the terminal insertion groove, the adhesive peel strength of the terminal is increased by using it in combination with an adhesive.

(4) By appropriately selecting the inner diameter of the terminal fixing hole in relation to the outer diameter of the terminal, it is possible to prevent the adhesive from flowing out to the side of the case.

It has the following advantages.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a variable resistor according to the present invention, and FIG. 2 is a perspective view of FIG. 1 viewed from another direction. FIG. 3 is a sectional view taken along line B-B in FIG. 2. FIG. 4 is a perspective view showing the internal structure of the variable resistor according to the present invention, FIG. 5 is a perspective view of a conventional variable resistor, and FIG. 6 is a perspective view of FIG. 5 viewed from another direction. Figure 7 is a cross-sectional view taken along the line A-A in Figure 6, Figure 8 is a schematic cross-sectional view of a conventional variable resistor, and Figures 9A and B.
2A and 2B are cross-sectional views illustrating the floating state of a terminal and the outflow of adhesive in a conventional example, respectively. Here, Figure 1,
Terminals 2a illustrated in FIGS. 4, 5, and 8,
The tip of terminal 2b or 2c is shown in a pressed state, and in the other drawings terminals 2a, 2b and 2c are shown in a state before being pressed, but they are the same terminal. 1...Case, 1b...Bottom of case, 1c...
Case side, 2a, 2c... L-shaped curved terminal, 2
b...U-shaped curved terminal, 3a, 3c...L-shaped curved terminal insertion groove, 4...Adhesive, 6...U-shaped curved terminal insertion groove, 7...Terminal fixing hole, 8...Meat Filled part, 9...Tapered part, 12...Shaft, 13
...Rotor, 16...Insulating substrate, 17a, 17
b, 17c... Electrode plate, 18... Resistor.

Claims (1)

[Scope of utility model registration request] L-shaped curved terminals connected to electrode plates provided at both ends of the horseshoe-shaped resistor, U-shaped curved terminals connected to a central electrode plate arranged approximately at the center of the horseshoe-shaped resistor, and the horseshoe-shaped resistor comprising a rotor slidable thereon and a drive shaft for the rotor;
In a variable resistor in which a terminal is adhesively fixed to a case, a part of the terminal insertion groove provided at the center of the bottom of the case is provided with a built-up part consisting of a slightly inclined taper part, and the terminal insertion groove and the side surface of the case are further connected. A variable resistor characterized in that a terminal fixing hole is formed to communicate with the terminal inserting groove and the terminal fixing hole, and an end of a U-shaped curved terminal inserted into the terminal insertion groove and the terminal fixing hole protrudes from a side surface of the case.