JPH0249405A - Variable resistance device - Google Patents

Abstract

PURPOSE:To unnecessitate a deceleration device and to perform an accurate setting of resistance by a method wherein a resistor and/or a sliding element is driven by the force of an ultrasonic motor. CONSTITUTION:A sliding element 2 is pressure-bonded on a stator 3 which performs ultrasonic ellistic vibrations, the sliding element 2 (the rotor of an ultrasonic motor) receives turning torque by the ultrasonic elliptic vibrations of the stator 3 through the intermediary of friction force, and it is driven at a low speed. As the sliding element 2 moves when the stator 3 starts ultrasonic elliptic vibrations by receiving the ultrasonic vibrations from an ultrasonic vibrator, the resistance of a variable resistance device can be changed. As a result, the deceleration device, which was necessary in the electromagnetic motor heretofore in use, is unnecessitated, and the accurate setting of resistance can be made possible.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a variable resistance device.

[Background of the invention]

A variable resistor generally has a structure in which the resistance of the variable resistor is changed by driving a slider inside the shell with an electromagnetic motor. By the way, in order to drive the slider of a variable resistor with an electromagnetic motor, especially when sliding the slider along a linear resistor, the rack teeth must be moved along the linear resistor. The rotary motion of the electromagnetic mower must be converted into linear motion by moving the rack teeth or moving the slider along the rack teeth, resulting in a complex structure. There is. Furthermore, since the output rotation speed of the electromagnetic motor must be transmitted at a slower speed, a speed reduction device using gears or the like must be used. In other words, in an electromagnetic motor, the rotor and stator interact with each other through space and operate without contact, and although this allows high speed rotation, the number + r, p, m, etc. It is not good at low-speed rotation, and therefore requires a reduction device such as a gear to be used in a variable resistance device. However, if a reduction gear is used, the variable resistance device becomes larger and heavier, and the cost also increases.Furthermore, the efficiency decreases significantly due to deceleration, and moreover, it is difficult to perform precise control, especially when using a normal reduction gear. However, since mechanical backlash is involved, application to precision positioning mechanisms such as variable resistance devices is problematic. Furthermore, since the rotor and stator of the electromagnetic motor are configured without contact, the stopping force is zero, so after setting the resistance of the variable resistance device to a predetermined value, it is impossible to set it to this predetermined value. In order to do so, a special variable stop mechanism must be provided, which further increases the complexity and cost. Another problem is that nearby electronic circuits pick up electromagnetic noise generated by the electromagnetic motor, causing disturbances in the electronic circuits. In addition, in a variable resistor in which a slider is slid along a resistor by an electromagnetic motor, for example, when rotating and sliding, the axis of rotation of the slider of the variable resistor and the rotation axis of the electromagnetic motor must be aligned. It has a complicated structure because it is coaxial.

[Disclosure of the invention]

In view of the above-mentioned problems, the inventor of the present invention, while proceeding with research and development, in other words, while considering motors other than electromagnetic motors, discovered that the rotor, which is crimped to the stator that makes ultrasonic elliptical vibration, We have come to the realization that if we apply an ultrasonic motor that utilizes one-turn torque received through force to a variable resistance device, we can create a variable resistance device that is close to the ideal. That is, unlike an electromagnetic motor, such an ultrasonic motor has maximum efficiency at a speed of, for example, 1 revolution per second, has large torque, high output density, simple structure, and has low stopping power. Because of its large size and ease of precise control, the adoption of ultrasonic motors not only solves the major drawbacks of electromagnetic motors, but also allows for significant improvements. It was assumed that there would be no drawbacks. The present invention was achieved through the above-mentioned research process,
The present invention provides a variable resistance device including a resistor and a slider, the resistor and/or the slider being configured to be driven by the force of an ultrasonic motor. Incidentally, if the slider and/or the resistor are configured as a rotor of an ultrasonic motor, the overall configuration of the variable resistance device becomes extremely simple. Furthermore, the rotor of the ultrasonic motor that serves as the slider and/or resistor of the variable resistance device may be driven by ultrasonic elliptical vibration, and the rotor movement may be limited to rotational movement or lateral movement. good.

【Example】

FIG. 1 is a principle diagram showing a first embodiment of a variable resistance device according to the present invention. In the figure, 1 is a resistor of a variable resistor, and 2 is a slider of the variable resistor. Reference numeral 3 denotes a stator that generates ultrasonic elliptical vibration, and the slider 2 is crimped onto this stator 3. The ultrasonic elliptical vibration of the stator 3 causes the slider 2 (this slider 2 The rotor) receives rotational torque through frictional force, and is driven at a low speed. Therefore, when the stator 3 undergoes ultrasonic elliptical vibration in response to ultrasonic vibration from the ultrasonic vibrator, this causes the slider 2 to
moves, so you can change the resistance of the variable resistance device.
Become. FIG. 2 is a principle diagram showing a second embodiment of the variable resistance device according to the present invention. In the figure, 5 is a resistor of a variable resistor, and 6 is a slider of the variable resistor. Reference numeral 7 denotes a stator that generates ultrasonic elliptical vibration, and the above-mentioned resistor 5 is crimped onto this stator 7. The ultrasonic elliptical vibration of the stator 7 causes the resistor 5 (this resistor 5 becomes the rotor of the ultrasonic motor). ) receives rotational torque through frictional force and is driven at low speed. In this embodiment, although the slider 6 is fixed, the resistor 5 is variable, so from the perspective of the resistor 5, the slider 6 slides, so it is not fixed or sliding. It is called Doko. Therefore, when the stator 7 undergoes ultrasonic elliptical vibration in response to ultrasonic vibration from the ultrasonic vibrator, this causes the resistor 5 to
moves, so the resistance of the variable resistance device can be changed. Although not specifically mentioned in the above embodiment, insulation is provided between the stator 3 and the slider 12 and between the stator 7 and the resistor 5.

【effect】

A variable resistance device according to the present invention is a variable resistance device including a resistor and a slider, and configured such that the resistor and/or the slider are driven by the force of an ultrasonic motor. Therefore, there is no need for a speed reduction device as in the case of using an electromagnetic motor, and there is no need to align the rotational axis of the slider of the variable resistance device with the rotational axis of the motor, thus increasing the size of the variable resistance device. Moreover, it has a simple structure without using a mold plate, and it is easy to perform precise control, that is, accurate setting of the resistor, and the resistor and slider can be removed after setting the resistance value to a predetermined value. It can be held in that position even without a special holding mechanism to hold it in that position relative to the It has the advantage of not causing noise in nearby electronic circuits unlike when using a motor.

[Brief explanation of the drawing]

FIGS. 1 and 2 show a first diagram of a variable resistance device according to the present invention.
and a principle diagram of a second embodiment. 1.5...Resistor, 2,6...Slider, 3,7...
- Stator (stator of ultrasonic motor).

Claims (3)

[Claims] (1) A variable resistance device comprising a resistor and a slider, characterized in that the resistor and/or the slider are driven by the force of an ultrasonic motor. . (2) In the variable resistance device according to claim 1, the slider is configured as a rotor of an ultrasonic motor. (3) In the variable resistance device according to claim 1, the resistor is configured as a rotor of an ultrasonic motor.