Method for achieving touch key under electrified metal shielding net

Abstract

The invention discloses a method for achieving a touch key under an electrified metal shielding net. An actual device structure for implementing the method comprises an a * b matrix key, an electrified metal wiring layer, an insulating layer, an FPC (Flexible Printed Circuit) matrix wiring collector layer, an induction device, an MCU (Microprogrammed Control Unit) data processing module, an output module and a PC (Personal Computer) analysis module;the MCU data processing module comprises a capacitance data collector; the beneficial effects of the invention are that the positive and negative electrode metal wires are parallel and are arranged according to a certain rule, and the positive and negative electrode circulation changes are carried out, thereby achieving the shielding of illegal approaching financial chip data reading, whether the shielding net is normally powered on or not is monitored through the collection of the capacitance value of the power-on metal net region, and when the power-on network is damaged, the financial IC can be instantly locked due to the fact that the chip cannot collect positive and negative energized capacitors, recognition of finger touch and insulation object touch is achieved through double-thread sampling, and the positioning position of touch is accurately obtained according to changes of capacitance values of different key areas.

Description

technical field [0001] The invention relates to the technical field of touch buttons, in particular to a method for realizing a touch button under an electrified metal shielding net. Background technique [0002] The traditional touch detection method is capacitive, that is, to detect the capacitance generated by the combination of the human body and the motor sensor. Therefore, the covering medium is required to be an insulator, and the capacitive sensing touch button can penetrate more than 8mm of the insulating material shell, which is accurate It detects the effective touch of the finger, and ensures that the sensitivity, stability, reliability, etc. of the product will not change due to changes in environmental conditions or long-term use, and it has waterproof, strong anti-interference ability, super protection and super Strongly adapt to the temperature range, when the cover is metal and energized, the capacitive signal will be absorbed and shielded, and the touch of ...

AI Technical Summary

Problems solved by technology

[0002] The traditional touch detection method is capacitive, that is, to detect the capacitance generated by the combination of the human body and the motor sensor. Therefore, the covering medium is required to be an insulator, and the capacitive sensing touch button can penetrate more than 8mm of the insulating material shell, which is accurate It detects the effective touch of the finger, and ensures that the sensitivity, stability, reliability, etc. of the product will not change due to changes in environmental conditions or long-term use, and it has waterproof, strong anti-interference ability, super protection and super Strong adaptability to the temperature range, when the cover is metal and energized, the capacitive signal will be absorbed and shielded, and the touch of the finger cannot be detected, so the touch detection under the energized metal shielding network cannot be realized

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