Method for improving precision and accuracy of capacitive touch key

Abstract

The invention provides a method for improving the precision and the accuracy of a capacitive touch key. The method comprises the following specific steps of: step 1), a resistor is added to the transmission path of the touch key, thus the various noise signals are attenuated to amplitudes which cannot be identified after passing through the resistor, so as to improve the identification precision, a resistor with a resistance of 1k to 3k is added to the transmission path at the rear end of the touch key, and because the amplitude of an interference signal is low, the amplitude is greatly attenuated and cannot be wrongly identified after passing through the resistor; step 2) in order to solve the problem of nonadjustable sensitivity or too high sensitivity of the touch key, a capacitor is connected aside the key in parallel, after the capacitor is added, a total capacitance of the touch area of the touch key to the ground is equivalently increased, when the key is touched by a finger, the generated capacitance change is certain, and if the total capacitance is increased, that is, a change ratio is reduced, the problem of too high sensitivity of key touch identification is solved, and when a certain distance exists between the finger and the key or the finger incidentally slides through the surface of the key, the operations of the key cannot be triggered.

Description

technical field [0001] The invention relates to the design of capacitive touch keys for notebook computers, desktop computers and tablet computers. The invention proposes a method for improving the touch recognition precision and accuracy of touch keys, improving the anti-interference ability and avoiding misoperation of keys, specifically a method for improving the precision and accuracy of capacitive touch keys. Background technique [0002] Touch keys are widely used in electronic products including computers because of their good waterproof and moisture resistance, relatively simple structural design, and no limit on the number of times of use of mechanical keys. However, due to the low reliability of touch buttons and the instability of general solutions, it is rarely used in special fields such as special computers. The present invention is proposed for the fields that require the application of touch buttons and at the same time pay attention to the precision and acc...

AI Technical Summary

Problems solved by technology

[0006] Step 2) In order to solve the problem that the sensitivity of the touch key is not adjustable or the sensitivity is too high, a capacitor is connected in parallel next to the key. After adding this capacitor, it is equivalent to increasing the total capacitance from the touch area of ​​the touch key to the ground. When the finger touches the key, a The capacitance change is constant, but the total capacitance increases, that is, the change ratio decreases, which solves the problem of high sensitivity of button touch recognition. When the finger is still a certain distance away from the button or the finger is not When the time slides across the surface of the button, the button operation will not be triggered;

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