JPH0138887Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a slider for a variable resistor.

FIG. 1 is a partially cutaway perspective view of a variable resistor.
The variable resistor 10 shown in FIG.
This is related to the issue. In Figure 1, 11 is a variable resistance adjustment knob, 12 and 13 are alumina substrate 1
A collector formed at 4, a circular arc-shaped cermet resistor, 15, 16, 17 external lead wires, 1
8 is a rotor, and 19 is a conventional slider attached to the rotor 18.

FIG. 2 is a plan view of a member 20 of a conventional slider 19, and FIG. 3 is a bottom view of the rotor 18 to which the slider 19 made of the slider member 20 is attached. This slider member 20 is made of a single metal plate 21 having good electrical conductivity. This metal plate 2
At one end of the metal plate 1, parallel to the surface of the metal plate 21 and diagonally at a predetermined angle θ with respect to the side edges 23, 23 on the other end side, fine width fingers 22 having a predetermined length are parallel to each other. is formed. Each of the fingers 22... is at least a distance d from the tip 22a.
It is turned back from the turning line 24 where it was placed and comes to the virtual position 25. In this way, the slider 19 of this conventional example is formed.

This slider 19 is attached to the bottom surface of the rotor 18 as shown in FIG. In this installation, the folded tip 2 of each finger 22...
A sliding contact portion 25 constituted by 2a is arranged on the diametrical line 24 of the rotor 18 and closer to the axis y of the rotor 18. In FIG. 3, d is the folding length of each finger 22, e is the linear distance between the folding point x of the outermost finger 22 and the axis y of the rotor 18, and f is the outermost sliding contact portion 25. sliding contact z
and the axial center y of the rotor 18, respectively. FIG. 4 is a perspective view of such a slider 19, and FIG. 5 is a side view of the slider 19. By the way, such a slider 19
Here, the length of the finger 22 is a straight part 21c of a predetermined length from one end side 21a of the metal plate 21, and a bent part 21 bent by a circular arc with a radius r from the center o.
d to the other end side 21b. Therefore, as shown in FIG. 6, which is an enlarged sectional view taken along line A-A in FIG. 4, the finger 22 is
They are arranged so as to be inclined with respect to the surface of the resistor 13 shown by the imaginary line B and to partially overlap with each other. Such overlapping of the fingers 22 may impede the free movement of the individual fingers 22, and may impair the desired sliding contact state on the resistor 13. Further, the finger 22 and the resistor 13 come into point contact, which may further impair the desired sliding contact state on the resistor 13.

The present invention ensures the free movement of each finger on the resistor, and allows each finger to slide in surface contact with the resistor to obtain a desired sliding contact state. The purpose is to

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 7 and 8.

The variable resistor to which this embodiment is applied has the same configuration as that shown in FIG. 1 except for the slider. Therefore, the seventh variable resistor shown in FIG.
The slider of the embodiment shown in the figure is applied. That is, as shown in FIG. 1, the variable resistor of this embodiment includes a variable resistance adjustment knob 11, a rotor 18, a collector 12 formed on a stator 14, an arc-shaped cermet resistor 13, and a lead Lines 15, 16,
17. A slider 30 shown in FIG. 7 is included in such a variable resistor, and includes a metal plate 31 having good electrical conductivity. The shape of this metal plate 31 before bending is such that, as shown in FIG. It is something. This slider 30 is a metal plate 3 like this.
1 by bending one end side 32 to the other end side 33. On this one end side 32, a large number of fingers 36, 36, . . . having a fine width and parallel to each other are formed. The length of each finger 36, 36... is set to be equal to or less than the length from the one end side 32 to the bent portion 37. Therefore, the fingers 36, 36, . . . are not provided in the bent portion 37. Therefore, as shown in FIG. 8, which is an enlarged sectional view taken along line C-C in FIG.
It will be placed in a state of surface contact with surface B of.

As described above, according to the present invention, a metal plate with good electrical conductivity is formed into a shape in which the side edge on one end side thereof is diagonal to the side edge on the other end side, and the one end side is A large number of fingers with a fine width and parallel to each other were formed on the one end side, and the length of the fingers was made equal to or less than the length from the one end side to the bent part, so that each finger Therefore, they do not overlap each other and can be brought into surface contact with the surface of the resistor of the stator, ensuring free movement of each other and achieving a desired sliding contact state with the resistor. Obtainable.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a variable resistor to which a conventional example and an embodiment of the present invention are applied, Figs. 2 to 6 show the conventional example, and Fig. 2 shows the members of the slider. A plan view, FIG. 3 is a bottom view of a rotor equipped with a slider made of the slider member shown in FIG. 2, FIG. 4 is a perspective view of the slider, and FIG. 5 is a side view of the slider. 6 is an enlarged sectional view taken along line A-A in FIG. 4, FIG. 7 is a perspective view of an embodiment of the present invention, and FIG. 8 is an enlarged sectional view taken along line C-C in FIG. 7. . 13...Resistor, 14...Stator, 18...
Rotor, 30... Slider, 31... Metal plate, 32
...One end side, 33, 35... Side edge, 34... Other end side, 37... Bent portion.

Claims (1)

[Scope of utility model registration request] In a variable resistor that has a rotor for variable resistance and a stator in which a resistor is formed in an arc shape around the rotor's rotation axis, a metal plate with good electrical conductivity is attached to one end of the variable resistor. The side edge is shaped diagonally with respect to the side edge of the other end, and one end is bent toward the other end, and a large number of fingers with fine width and parallel to each other are formed on the one end side, and the fingers The slider of the variable resistor has a length equal to or less than the length from the one end side to the bent portion.