JPS6362003B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manually or motor-driven variable resistor signal conditioning device.

In a signal conditioning device that uses a variable resistor to attenuate and output an input signal, the slider of the variable resistor is moved manually or by a motor. The sliding knob is normally connected to the rotor shaft when driven by a motor, and when moved manually, it is connected to the motor's rotor shaft via a transmission means. However, the operation required force and had the drawback that it was difficult to make adjustments when making minute changes manually.

It is an object of the present invention to provide a signal conditioning device that eliminates the above-mentioned drawbacks.

Hereinafter, one embodiment of the present invention will be described with reference to block diagrams of the drawings.

1 is a variable resistor that attenuates the input signal and outputs it, 1-1 is the variable resistor main body of variable resistor 1, 1-2 is a slider, and 1-3 is an operation for moving the slider. It is a knob, 1-4 is a signal line for outputting that the operation knob has been touched, and 1-5 is a variable resistor for detecting the position of the operation knob 1-4. It is written as a potentiometer.

The outputs of the potentiometers 1-5 are output to the memory (not shown) of a microcomputer, for example, and the moving speed of the slider 1-2 is stored in the memory, and the slider is moved by the motor 2 under control from the memory. 1-2, drive operation knob 1-4.

Reference numeral 3 designates a servo amplifier that receives the target value outputted from the memory described above and the outputs of the potentiometers 1-5 and generates an output corresponding to the difference between them. , is applied to the motor 2 via the overcurrent detector 6.

The overcurrent detection output of the overcurrent detector 6 is output from the switching circuit 4.
Switch. The output of a differentiating circuit 7 for differentiating the outputs of the potentiometers 1-5 is applied as the other input of the switching circuit 4.

On the other hand, reference numeral 8 denotes a touch detection circuit that detects a signal when the operation knob 1-3 is touched and switches the contact of the switching circuit 4 to the differential circuit 7 side.

In this embodiment configured as described above, when the operating knob 1-3 is touched and manually moved, the variable resistor main body 1-1 changes its resistance value and inputs a signal. Attenuate and output. In this case, the switching circuit 4 is switched to the differential circuit 7 side by touching the operation knob 1-3, and the output of the potentiometer 1-5 is changed to the differential circuit by manually moving the operation knob 1-3. 7, is amplified by an amplifier 5, and drives the motor 2 via an overcurrent detector 6. Therefore, the operating knob 1-3 is driven by the motor 2 in the direction of movement of the operating knob 1-3. The direction of this drive is the direction in which the operating knobs 1-3 are manually moved.
Therefore, manual operation of the operating knobs 1-3 is extremely light, and fine adjustments can be easily made.

Next, the operation of storing the amount of movement of the operating knobs 1-3 in the memory will be explained. Operation knob 1-3
When the slider that slides the second potentiometer 1-5 sends out an analog signal corresponding to the amount of movement, this analog signal is picked up by a clock pulse, and then the slider (not shown) is operated.
It is converted into a digital signal by a D converter and stored in memory. That is, potentiometers 1-5
The resistance value of is stored in memory corresponding to the frequency of the clock pulse.

Next, a case will be described in which the motor 2 is controlled by the output from the memory.

As mentioned above, the resistance value corresponding to the position of the slider at the frequency of the clock pulse is stored in the memory as a digital signal, so the digital signal from the memory is converted into an analog signal by a D/A converter (not shown). and input it to the servo amplifier 3. On the other hand, since the output from the potentiometers 1-5 is also input to the servo amplifier 3, the output of the servo amplifier 3 drives the motor 2 via the switching circuit 4, the amplifier 5, and the overcurrent detector 6. Motor 2 causes the outputs of potentiometers 1-5 to match the target value output from memory.
The positions of the operation knobs 1-3 are regulated. Note that while the motor 2 is being driven by the signal from the memory to move the operation knobs 1-3, if the signal from the memory goes out of control for some reason, the operation knobs 1-3 should be moved. Even after moving to the end, the signal from the memory will be input. In such a case, an overcurrent flows to the motor 2, so the overcurrent detector 6 detects this current, sends an output to the switching circuit 4, switches the movable contact to the differentiating circuit 7 side, and transfers the current from the servo amplifier 3 to the switching circuit 4. The output of the motor 2 is cut to prevent burnout of the motor 2 and failure of the mechanical part.

Also, when controlling using the output from the memory, if you touch the operation knobs 1-3,
The switching circuit 4 is switched to the differential circuit 7 side by the output of the touch detection circuit 8, the output of the servo amplifier 3 is cut off, and the movement of the operating knobs 1-3 is stopped. If you manually move operation knobs 1-3 in this state,
Potentiometer 1 by moving operation knobs 1-3
The output voltage of -5 is differentiated by the differentiating circuit 7,
This differential output drives the motor 2 in the same manner as described above to reduce the force required to manually move the operating knob 1-3, making it easier to move the operating knob 1-3.

As explained above, according to the present invention, a differentiating circuit for differentiating the output of the potentiometer is provided, and the motor is driven by the output of the differentiating circuit when the operating knob of the variable resistor is manually operated. The knob is light and easy to operate, allowing for fine adjustments.

[Brief explanation of drawings]

The figure shows a block diagram for use in a signal conditioning device according to the invention. 1... Variable resistor, 1-2... Slider, 1-3
...Operation knob, 1-5...Potentiometer, 2
... Motor, 3 ... Servo amplifier, 4 ... Switching circuit, 5 ... Amplifier, 6 ... Overcurrent detector, 8 ...
Touch signal detection circuit.

Claims (1)

[Claims] 1. An operation knob having three sliders, a first variable resistor that attenuates and outputs an input signal by moving the operation knob, and detects when the operation knob is touched. a variable resistor having a signal line made of a conductor, and a second variable resistor for detecting the position of the operating knob; a differentiating circuit connected to a slider of the second variable resistor; A switching circuit in which the output of the servo amplifier, which will be described later, is input to one of the fixed contacts, and the output from a servo amplifier, which will be described later, is input in addition to the fixed contact, and the switching circuit is connected to a movable contact of the switching circuit via an amplifier, and rotates. a motor that moves the operating knob to move the three sliders; a touch detection circuit that switches the movable contact of the switching circuit to the differential circuit side when a signal touching the operating knob is detected via a signal line; A signal conditioning device comprising: a servo amplifier to which an output from a memory storing the position of the slider in the second variable resistor is input.