Capacitor induction type touch press-key and measuring method for touch press-key capacitor

A capacitive sensing and button technology, which is applied in the measurement of capacitive-sensing touch buttons and the capacitance of touch buttons, and in the field of electronic product control, can solve the problems of large output signal value error, easy wear of mechanical buttons, misoperation or immobility, etc., to achieve Improve reliability, low cost, and realize the effect of precise positioning

Inactive Publication Date: 2009-08-05
LIERDA SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, traditional mechanical buttons have the disadvantages of easy wear, complicated installation, and large changes due to environmental factors such as temperature, humidity, and dust; and piezoelectric t

Method used

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  • Capacitor induction type touch press-key and measuring method for touch press-key capacitor
  • Capacitor induction type touch press-key and measuring method for touch press-key capacitor
  • Capacitor induction type touch press-key and measuring method for touch press-key capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: with reference to attached figure 1 with 2 . Capacitive sensing touch button, the shape of the touch button can be square, round, or bar. The touch buttons are distributed on the PCB printed circuit and are respectively connected to the negative signal input terminal of the comparator, the resistor R C (Resistance R C means R C1 ~R Cn ) connected at one end, R C The other end of R is respectively connected to the output end of the comparator, the signal end of the timing counting module and one end of the resistor R, and the other end of R is connected to the positive signal input end of the comparator. That is to say, 1 to n touch buttons are distributed on the PCB printed circuit and are respectively connected to the signal input terminals of the multi-channel analog switch by wires and connected to the resistor R respectively. C1 ~R Cn connected at one end, R C1 ~R Cn The other end is connected to R in the resistor ladder network 1 One end of...

Embodiment 2

[0014] Embodiment 2: with reference to attached image 3 with 4 . On the basis of Embodiment 1, capacitive sensing type touch keys, the touch keys are distributed on the PCB printed circuit and are respectively connected to the signal input terminal of the MCU, the resistor R C connected at one end, R C The other end of the MCU is connected to the signal end of the MCU and R in the resistor ladder network 1 connected at one end, R 1 The other end of the resistor ladder network R 2 and R 3 One end and the signal end of the MCU, R 2 The other end is connected to the signal end of the MCU, R 3 The other end of the ground. 1~n touch buttons are distributed on the PCB printed circuit and use wires to connect with resistor R respectively. C1 ~R Cn connected at one end, R C1 ~R Cn The other end is connected to R in the resistor ladder network 1 One end of the MCU signal end, R 1 The other end of the MCU is connected to the signal end and R 2 , R 3 one end of the R 2 ...

Embodiment 3

[0015] Embodiment 3: On the basis of embodiment 1 or 2, the measuring method of capacitive sensing type touch key capacitance, comparator and PCB capacitive touch key form an oscillating circuit, the frequency of this oscillating circuit changes with the change of touch key capacitance, When the system is initialized, when no button is pressed, each touch button has its corresponding basic capacitance. The timing counting module or MCU records the oscillation frequency corresponding to the basic capacitance value of each touch button. When the finger is pressed on the touch button , the capacitance value of the touch button becomes larger, the frequency of the oscillating circuit becomes smaller, and the timing counting unit detects that the frequency of the oscillating circuit becomes smaller, confirming that the capacitive touch button has been pressed, that is, the PCB touch button and the comparator are connected as shown in the figure , using the capacitance of the PCB tou...

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Abstract

The invention relates to a capacitive sensitive type touch key based on MCU and a measuring method for the capacitance of the touch key. The touch keys are distributed on a PCB printed circuit and are respectively connected with a negative signal input end of a comparator and one end of a resistor RC; the other end of the RC is respectively connected with an output end of the comparator, a signal end of a timing counting module and one end of a R1 in a resistor ladder network; and the other end of the R1 is connected with a positive signal input end of the comparator. The invention has the advantages that (1) the capacitance touch sensitive technology is adopted to design the touch keys, the cost is low and the special sensor is not needed; (2) the power consumption is lower; (3) the sensitive type light touch can realize the output of the signals; (4) the realizing mode can be diverse and can realize positioning of precision; (5) the touch key can replace various mechanical keys, switches and proximity detectors; (6) the structure is simple and the wear resistance is good; and (7) as the traditional key is not used, the touch sensitive key can adopt a whole seamless panel, the dust prevention effect is excellent and the reliability of the product is improved.

Description

technical field [0001] The invention relates to a capacitance-sensing touch button and a method for measuring the capacitance of the touch button, which are mainly used for electronic product control and belong to the field of touch button manufacturing. Background technique [0002] At present, traditional mechanical buttons have the disadvantages of easy wear, complicated installation, and large changes due to environmental factors such as temperature, humidity, and dust; and piezoelectric thin-grind touch buttons are not only expensive, but also easy to damage, and are affected by temperature and humidity. , the value error of its output signal is large, which is easy to cause misoperation or immobility. Contents of the invention [0003] Design purpose: In order to avoid the deficiencies in the background technology, design a sensitive and accurate capacitive-sensing touch key and a method for measuring the capacitance of the touch key that uses a PCB printed circuit a...

Claims

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Application Information

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IPC IPC(8): H03K17/96G01R27/26
Inventor 何佳王鲁克梁源贾灵张其华祝继华张冲赵振东
Owner LIERDA SCI & TECH GRP
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