JPS603524Y2 - variable resistor - Google Patents

Description

[Detailed explanation of the invention] This invention is incorporated into a set, and the resistance value is adjusted after assembly.
Equipped with resistive film electrodes on both ends of the resistive film and sliding contacts that slide on the resistive film, which can be used for semi-fixed variable resistors that cannot be adjusted externally, and regular variable resistors that can be freely adjusted externally. This invention relates to a mounting structure for rotatably mounting a wiper and its lead wire.

Conventionally, this type of variable resistor has a lead wire formed integrally with a resistive film electrode exposed on the surface of the base, and a lead wire formed integrally with the wiper mounting electrode exposed on the central surface of the base. is buried within the base.

With this type of variable resistor, there is a risk of an electrical short circuit between the resistive film and the wiper mounting electrode, and in some cases it may be necessary to polish the resistive film electrode, but with this type of variable resistor, polishing is easy. I couldn't do it.

The purpose of the present invention is to provide a variable resistor that prevents short circuits between the resistive film and the wiper mounting electrode, and also allows the resistive film electrode to be polished, and will be explained using a semi-fixed variable resistor as an example.

As shown in FIG. 1, the resistive film lead wires are connected to both ends of the resistive film.

The wiper lead wires connected to t3 and the wiper are formed from a continuous metal band into a continuous portion a to form a large number of lead wires into a continuous shape, and the manufacturing process is continued in that state.

In the present invention, the resistive film lead wire t1. The tip of t3 is bent 1 in a stepwise manner to form the resistive film electrode 2 integrally with the lead wire or t3.

A separate wiper lead wire t2 is also integrally formed with a wiper mounting electrode 4 in the shape of an inward protruding edge with a circular hole 3 punched out at its tip.

For each lead wire t1*''39 t2, a material plated with solder is used together with the electrode in order to facilitate and ensure soldering when assembling the set.

The wiper mounting electrode 4 formed as described above and the resistive film electrodes 2, 2 are connected to each other.
The resistive film electrodes 2, 2 are exposed on the surface of the synthetic resin base 5, and the wiper mounting electrode 4 protrudes into the wiper mounting hole 6 formed in the base. The base 5 should be shaped so that a part of the lead wires tif, t3t, and t2 of each electrode are embedded and fixed inside the base 5 (Fig. 2).
Then, the solder plating of the resistive film electrodes 2, 2 exposed on the surface of the base 5 is polished off, and a truncated circular resistive film 7 is baked on the base surface between the two electrodes (FIG. 3).

Next, a wiper 11 having a contact point 10.10 formed by drilling a semicircular concentric groove 8°8 in an elastic metal plate and further recessing the center of the downwardly bent elastic contact pieces 9,9. A recess 12 is formed in the center of the
3, and the protruding portion thereof is bent downward.
is inserted into the circular hole 3 of the wiper mounting electrode 4, the recess 12 is supported by the wiper mounting electrode 4, the claw piece 14 is bent to the lower surface of the wiper mounting electrode 4, and the wiper 11 is rotatably attached to the wiper mounting electrode 4. The contact points 10 and 10 are pressed against the resistive film 7, and the continuous part a where the resistive film lead wires t1, t3 and wiper lead wire t2 are connected is cut along the cutting line in FIG. 1, and the lead wires are cut off. t□.

t3. Bend t2 in the required direction.

After the variable resistor of the above embodiment is assembled into a set,
The driver is inserted into the driver insertion hole 13, and the wiper 11 is rotated to adjust the resistance value.As is clear from the above explanation, the resistance value at both ends of the resistive film 7 is adjusted using a so-called semi-fixed variable resistor that cannot be adjusted externally. The membrane electrodes 2, 2 and the wiper mounting electrode 4 are both connected to the lead wire t1. t3. t2, the resistive film electrodes 2, 2 are exposed on the surface of the base 5, and the wiper mounting electrode 4
protrudes into the wiper mounting hole 6 at a position below the surface of the base 5 and is embedded in the base 5, and the resistive film 7 has the resistive film electrodes 2, 2 and 2 whose solder plating has been removed by polishing. Base 5
is burned onto the required surface.

Further, since the wiper 11 is fixed to the wiper mounting electrode by a claw piece 14 that is integral with the wiper 11 punched out to open the driver insertion hole 13, the number of components is reduced and the manufacturing process is simplified.

In addition, the wiper mounting electrode 4, the resistive film 7, and the resistive film electrode 2.
Since the radius length of the steps is different from that of 2, the creepage length is larger, and there is no risk of short circuit with the wiper. , Wiper mounting electrode 4 that does not require removing solder plating
are not polished at the same time.

Furthermore, the wiper 11 has a driver insertion hole 1 for driving the wiper.
Since the wiper 11 is fixed using the claw pieces 14 that are punched out for opening the wiper 11, the structure for mounting the wiper 11 is also simplified.

FIG. 7 shows another embodiment of the wiper mounting structure, in which the wiper 11 is required to be able to rotate smoothly when necessary without moving uncontrollably at all times, and when the claw pieces 14 are bent, If the pressing torque for bending the wiper 11 is not appropriate, the wiper 11 may move erratically or become difficult to rotate.

In this embodiment, the upper end of the wiper mounting hole 6 supports the inclined peripheral wall 15 of the recessed part 12 of the wiper 11, and a gap g is formed between the lower surface of the recessed part 12 and the wiper mounting electrode 4, so that the claw piece 14 is attached to the wiper. It is bent on the lower surface of the attached electrode 4. This makes it easy to position the wiper 11, and provides elasticity in the support by bending the claw piece 14, so that the pressing torque for bending the claw piece 14 can be determined. This makes it easy to rotate the wiper 11 smoothly.

Although the above embodiment describes a semi-fixed variable resistor, if the wiper 11 is rotated by a shaft that rotates together with the wiper, it can be used as a normal variable resistor that is adjusted from the outside. I can do it.

[Brief explanation of the drawing]

1 to 3 are perspective views showing the steps of manufacturing the variable resistor of the present invention. Figure 4A is a plan view of the base, Figure B is a longitudinal side view of the base,
Figure 5A is a plan view of the wiper, Figure B is a longitudinal side view of the wiper, Figure 6A is a plan view of the product, Figure B is a vertical side view, Figure C is a bottom view of Figure A, FIG. 7 is a partially longitudinal side view showing another embodiment of the wiper mounting structure. tl, t3... Resistive film lead wire, t2...
・・Wiper lead wire, 2・・・・Resistance film electrode, 4・
...Wiper mounting electrode, 5...Base, 6.
...Wiper mounting hole, 7...Resistive film, 10
...Contact, 14...Claw piece.

Claims (2)

[Scope of utility model registration request] (1) Resistive film electrodes in contact with both ends of the resistive film, their lead wires, and wiper mounting electrodes and their lead wires to which the wiper is rotatably formed, respectively, are integrally formed, and a synthetic resin base has a wiper mounting hole. The resistive film electrode is exposed on the surface, the wiper mounting electrode is made to protrude into the wiper mounting hole below the base surface, and a part of the lead wire integrated with each electrode is embedded and fixed in the base resin. A variable resistor in which a wiper is rotatably attached to a wiper mounting electrode, and the wiper has a sliding contact that elastically presses against an occluded resistance film formed on the surface of a base between the resistance film electrodes. (2) A wiper with a sliding contact that elastically presses against the occluded resistance film formed on the base surface is punched out, and a pawl piece formed is bent onto the underside of the wiper mounting electrode in the shape of an inward protrusion. The variable resistor according to claim 1, which is mounted in a rotatable semi-fixed manner.