JPH10189314A - Dual rotary potentiometer - Google Patents

Abstract

(57) [Problem] To provide a dual-rotation potentiometer capable of increasing the effective rotation angle of a resistor, having a small linearity error due to eccentricity, and having good output characteristics. SOLUTION: Two sliders 2 rotating in conjunction with each other
In a dual rotary potentiometer having two sets of an arc-shaped resistor and a current collector, each of which has a sliding contact with the slider on the insulating substrate 11, the slider 24 , 25, the two resistors 14 and 15 are arranged on the same circumference about the center of rotation.
Current collectors 12 and 13 are arranged on the outer peripheral sides of 4 and 15, respectively. The entire circumference can be used for arranging the resistors 14 and 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has two sliders that rotate in conjunction with each other, and a set of an arc-shaped resistor and a current collector, each of which is in sliding contact with each other, on an insulating substrate. 2
The present invention relates to a dual rotary potentiometer formed as a set.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional potentiometer of this type. An arc-shaped first current collector 12 and a second current collector 13 are formed on an insulating substrate 11 so as to face each other, and arc-shaped first current collectors 12 and 13 are formed outside (outer peripheral side) of the current collectors 12 and 13 respectively. The first resistor 14 and the second resistor 15 are formed.

[0003] The upper end 14a of the resistor 14 and the lower end 15b of the resistor 15 are connected by a connection conductor 16 passing through the outer periphery of the resistor 15 as shown in the figure.
Is led out to one side of the insulating substrate 11, and the lead-out portion serves as a ground terminal electrode 17. On the other hand, the upper end 1 of the resistor 15
5a and the lower end 14b of the resistor 14 are connected by a connecting conductor 18 passing through the inner peripheral side of the resistor 14,
Is similarly led out to one side of the insulating substrate 11, and the lead-out portion is used as the input terminal electrode 19.

The input terminal electrode 19 and the ground terminal electrode 17
A first output terminal electrode 21 and a second output terminal electrode 22 respectively derived from the current collectors 12 and 13 are arranged between them. Resistive substrate 23 configured as above
A rotatable body (not shown) to which a pair of sliders 24 and 25 is attached is rotatably engaged to form a dual rotary potentiometer. In the drawings, the sliders 24 and 25 are schematically shown.

In the potentiometer shown in FIG. 5, an input voltage is applied between the input terminal electrode 19 and the ground terminal electrode 17, and the sliders 24 and 25 are rotated in the directions indicated by the arrows, respectively. 12 and resistor 15, current collector 1
By contact sliding on 3, as shown in FIG. 6, almost the same output characteristics are obtained from the first output terminal electrode 21 and the second output terminal electrode 22, that is, from the two potentiometers. I have.

On the other hand, FIG. 7 shows an example of a dual rotary potentiometer in which two potentiometers are considered to have conflicting output characteristics. This embodiment differs from the potentiometer of FIG. 5 in the way the two conductors 14 and 15 are connected by the connection conductors 16 and 18, that is, the upper end 14 a of the resistor 14 is connected to the connection conductor 16 led to the ground terminal electrode 17. The lower end 14 b of the resistor 14 and the lower end 15 of the resistor 15 are connected to the upper end 15 a of the resistor 15 by a connection conductor 18 led out to the input terminal electrode 19.
b is connected.

With such a connection, the sliders 24, 25
Is rotated in the direction of the arrow, the output characteristic obtained from the first output terminal electrode 21 rises from the minimum output voltage to the maximum output voltage, as shown in FIG. 8, while the second output terminal electrode 2
2, the output characteristics decrease from the maximum output voltage to the minimum output voltage, and contradictory output characteristics are obtained.

FIGS. 9A to 9C and FIGS. 10A to 10C show other examples of conventionally proposed configurations in which the same output characteristics and the opposite output characteristics can be obtained from two potentiometers. The wiring method of the connection conductors 16 and 18 and the terminal electrodes 17, 19,
The arrangement order of 21 and 22 is different.

[0009]

By the way, in a rotary potentiometer, if there is a deviation between the center of the circular arc and the rotation center of the slider, as shown in FIG. The actual output characteristic 27 deviates from the ideal output characteristic 26 indicated by a straight line, and this deviation is called a linearity error.

The linearity error due to the eccentricity of the center of rotation of the slider is represented by the ratio of the error angle to the effective rotation angle of the resistor. Now, as shown in FIG. 12, when the rotation center of the slider is O, the center of the resistor is O ', the displacement is e, and the rotation radius of the slider is R, the error angle (maximum) φ Is expressed as φ = tan ⁻¹ (e / R), and assuming that the effective rotation angle of the resistor is θ, the linearity error is: linearity error = φ / θ × 100 [%] = 100 tan ⁻¹ ( e / R) / θ [%].

As is apparent from the above equation, the larger the effective rotation angle θ of the resistor, the smaller the linear error due to eccentricity. However, in the conventional dual rotary potentiometers shown in FIGS. 5, 7, 9 and 10, all of them correspond to the inner peripheral sides of the arc-shaped resistors 14 and 15 arranged opposite to each other. Since the two current collectors 12 and 13 are disposed, the terminal electrodes 21 and
Each lead-out portion to 22 traverses the circumference where the resistors 14 and 15 are located, that is, the arrangement angle of the resistors 14 and 15 is limited by the lead-out portion, and the effective rotation angle is narrowed. .

Further, in FIGS. 9 and 10, the connecting conductor 16 or 18 for connecting the resistors 14 and 15 also crosses the circumference where the resistors 14 and 15 are located. The effective rotation angles of 14, 15 were narrowed. SUMMARY OF THE INVENTION An object of the present invention is to provide a dual rotary potentiometer capable of increasing the effective rotation angle of a resistor as compared with the related art in view of the above-described problems.

[0013]

According to the first aspect of the present invention, there is provided an arc-shaped resistor having two sliders which rotate in conjunction with each other, and each of which slides on the insulating substrate. In the dual rotary potentiometer in which two sets of the current collector and the current collector are formed, the above two resistors are arranged on the same circumference about the center of rotation of the slider. The current collectors are arranged on the outer peripheral side.

According to the second aspect of the present invention, there are provided two sliders which rotate in conjunction with each other, and each of the arc-shaped resistor and the current collector which are in sliding contact with each other on the insulating substrate. In a dual-type rotary potentiometer in which two sets are formed, the two resistors are arranged on the same circumference about the center of rotation of the slider, and one of the two current collectors is connected to the resistor. The current collector is arranged on one inner peripheral side of the body, and the other of the current collectors is arranged on the other outer peripheral side of the resistor.

According to a third aspect of the present invention, in any one of the first and second aspects of the present invention, the ends of the two resistors facing each other in the circumferential direction are connected by connection conductors. According to a fourth aspect of the present invention, in any one of the first and second aspects of the present invention, when the slider is rotated, an end on the side of the resistor where the corresponding slider separates is a first end, When the approaching end is defined as the second end, the first end and the second end are connected by the connection conductor.

[0016]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of the first aspect of the present invention. Parts corresponding to those in FIG. 7 are denoted by the same reference numerals. Also, a pair of sliders 2
4 and 25 are schematically shown.

In this example, the arc-shaped first resistor 14 and the second resistor 15 are arranged on the same circumference about the center of rotation of the sliders 24 and 25, and these resistors 14 ,
Arc-shaped current collectors 12 and 13 are respectively arranged on the outer peripheral side of 15. The ends of the resistors 14 and 15 facing each other in the circumferential direction, that is, the upper end 14a of the resistor 14 and the resistor 15
, The lower end 14b of the resistor 14 and the lower end 15b of the resistor 15 are connected by connection conductors 16 and 18, respectively.

The connecting conductor 16 passes through the outer peripheral side of the current collector 12 and is led out to one end of the insulating substrate 11, and the lead-out portion serves as a ground terminal electrode 17. The first output terminal electrode 2 derived from the current collector 12 adjacent to the ground terminal electrode 17
1. An input terminal electrode 19 derived from the connection conductor 18 and a second output terminal electrode 22 derived from the current collector 13 are sequentially provided. In this example, a hole 31 is formed in the insulating substrate 11 through which a mating rotary shaft to which a rotating body (not shown) holding the sliders 24 and 25 is attached is inserted.

In the dual rotary potentiometer shown in FIG. 1, the two potentiometers have opposite output characteristics as shown in FIG. 8, and a manufacturing method will be briefly described below. For example, current collectors 12 and 13, connection conductors 16 and 18, and terminal electrodes 17 and 1 are formed on an insulating substrate 11 made of a synthetic resin material or ceramic using silver paste.
9, 21 and 22 are printed and fired. Next, the resistors 14 and 15 are formed by printing using a resistor paste, and then fired.

Then, except for the terminal electrode portions, the surface of the portion formed of the silver paste is covered with the resistive paste. This resistance paste prevents oxidation of silver,
25 to prevent abrasion due to sliding of the resistor 14,
A material having a resistivity much lower than that of the resistive paste used in No. 15 is used. A rotating body on which a pair of sliders 24 and 25 are mounted is rotatably engaged with the resistance substrate 23 formed as described above, thereby forming a dual rotary potentiometer. The slider 24 has a structure that slides on the resistor 14 and the current collector 12, and the slider 25 has a structure that slides on the resistor 15 and the current collector 13.

According to the above-mentioned dual rotary potentiometer, there is nothing that crosses the circumference where the resistors 14 and 15 are located, that is, the entire circumference can be effectively used for arranging the resistors 14 and 15. , The effective rotation angles of the resistors 14 and 15 can be maximized. FIG. 2 shows another embodiment of the present invention. This example is 2
The two potentiometers have almost the same output characteristics as shown in FIG.

In this example, when the sliders 24 and 25 are rotated, the corresponding sliders 2
The ends on the side where the wires 4 and 25 are separated from each other and the ends on the side where the wires 4 and 25 approach each other are connected, that is, the upper end 14 a of the resistor 14 is
5 is connected to the lower end 15b of the resistor 14 by a connection conductor 16 passing through the inner peripheral side of the resistor 15.
And the upper end 15 a of the resistor 15 are connected to the resistor 15 and the current collector 13.
Are connected by a connection conductor 18 passing between the two. The arrangement of the terminal electrodes is the same as that in FIG. 1, and the connection conductor 16 is led to the ground terminal electrode 17 through the outer peripheral side of the current collector 12.

In the potentiometer shown in FIG. 2, none of the potentiometers cross the circumference where the resistors 14 and 15 are located, and the effective rotation angle of the resistors 14 and 15 can be increased. Next, an embodiment of the invention of claim 2 will be described with reference to FIG.
This will be described with reference to FIG. In this example, one current collector 13 is disposed on the inner peripheral side of the corresponding resistor 15 and the other current collector 1
2 is arranged on the outer peripheral side of the corresponding resistor 14. In this example, two potentiometers have opposite output characteristics. The upper ends 14a and 15a of the resistors 14 and 15 are connected by a connection conductor 16, and the lower ends 14b and 15b are connected by a connection conductor 18.

The upper ends 14a, 15a of the resistors 14, 15
The connection conductor 16 disposed therebetween passes through the outer peripheral side of the resistor 15 and is led out to one end of the insulating substrate 11, and the lead-out portion serves as a ground terminal electrode 17. On the other hand, the connection conductor 18 passes from the lower end 15b of the resistor 15 to the lower end 14b of the resistor 14 through the space between the resistor 15 and the current collector 13 and the inner peripheral side of the resistor 14.
, And is led out to the input terminal electrode 19 therefrom. A second output terminal electrode 22 derived from the current collector 13 is located between the terminal electrodes 17 and 19,
On the other hand, the first output terminal electrode 21 is located outside the input terminal electrode 19.

In the potentiometer shown in FIG.
Only one lead-out portion of the current collector 13 crosses the circumference where the resistors 14 and 15 are located. Fifteen
Can take a large effective rotation angle. FIG.
3, only one of the current collectors 13 is a resistor 14,
15 and the connecting conductors 16 and 18
Are arranged as shown in the figure, whereby two potentiometers are configured to have the same output characteristics. Also in this example, the resistors 14, 15
Only the lead-out portion of the current collector 13 crosses the circumference where is located.

[0026]

As described above, according to the present invention, in a dual rotary potentiometer in which two arc-shaped resistors are arranged opposite to each other on the same circumference, the effective rotation angles of the two resistors are determined. As compared with the prior art, it is possible to obtain a dual rotary potentiometer having good output characteristics and a small linearity error due to the eccentricity of the rotation center of the slider.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of the invention of claim 1;

FIG. 2 is a plan view showing another embodiment of the invention of claim 1;

FIG. 3 is a plan view showing an embodiment of the invention of claim 2;

FIG. 4 is a plan view showing another embodiment of the invention of claim 2;

FIG. 5 is a plan view showing an example of a conventional dual rotary potentiometer.

FIG. 6 is an output characteristic diagram of FIG. 5;

FIG. 7 is a plan view showing another example of a conventional dual rotary potentiometer.

8 is an output characteristic diagram of FIG.

9A to 9C are plan views showing other examples of the dual rotary potentiometer having the output characteristics of FIG.

10A to 10C are plan views showing other examples of the dual rotary potentiometer having the output characteristics of FIG.

FIG. 11 is an output characteristic diagram for explaining a linearity error.

FIG. 12 is a diagram for explaining an error angle due to eccentricity.

Claims (4)

[Claims] 1. An insulating substrate comprising two sets of a pair of an arc-shaped resistor and a current collector, each of which is in sliding contact with each other. In the dual rotary potentiometer, the two resistors are arranged on the same circumference about the center of rotation of the slider, and the current collectors are arranged on the outer periphery of the resistors. A dual rotary potentiometer. 2. An insulating substrate comprising two sets of a pair of an arc-shaped resistor and a current collector, each of which is in sliding contact with each other, is formed on an insulating substrate. In the dual rotary potentiometer, the two resistors are arranged on the same circumference about the center of rotation of the slider, and one of the two current collectors is one of the resistors. A dual rotary potentiometer, which is disposed on a peripheral side, and wherein the other of the current collectors is disposed on an outer peripheral side of the other of the resistors. 3. The dual rotary potentiometer according to claim 1, wherein ends of the two resistors facing each other in the circumferential direction are connected by a connection conductor. Characteristic dual rotary potentiometer. 4. The dual rotary potentiometer according to claim 1, wherein when the slider is rotated, an end of the resistor on the side from which the corresponding slider separates is formed. When the first end and the approaching end are respectively defined as the second end, the first ends and the second ends are connected by connection conductors. Dual rotary potentiometer.