Pressing key detection system, device, method, and storage medium

An electronic device, comprising a key pressing detection system, wherein the key pressing detection system comprises at least one key, a driving circuit, a detection circuit, and a processing unit;

• each of the at least one key comprising a base and a movement assembly, the movement assembly extending through a top surface of the base and configured to reciprocate in a first direction perpendicular to the top surface, and the movement assembly comprising a core shaft and two conductor plates opposite to the core shaft and fixed relative to the core shaft;
• the base comprising a casing, a main electrode plate, and a secondary electrode plate both fixed relative to the casing, the two conductor plates being arranged opposite to the main electrode plate and to the secondary electrode plate, the secondary electrode plate, the two conductor plates, and the main electrode plate forming a target capacitor configured to generate capacitance signals that change in response to the core shaft reciprocating;
• wherein the driving circuit is connected to the secondary electrode plate and configured to drive the secondary electrode plate, and the detection circuit is connected to the main electrode plate and configured to detect the capacitance signals of the target capacitor;
• wherein the processing unit is connected to the detection circuit and configured to determine a displacement of the at least one key according to the capacitance signals of the target capacitor;
• wherein each of the two conductor plates is arranged on a respective outer side wall of the core shaft, and the two conductor plates are connected to each other by wires;
• wherein each of the secondary electrode plate and the main electrode plate is arranged on a respective inner side wall of the casing, the secondary electrode plate is arranged opposite to one of the two conductor plates, and the main electrode plate is arranged opposite to the other one of the two conductor plates;
• wherein the main electrode plate comprises at least one first electrode plate and a second electrode plate, the secondary electrode plate, the two conductor plates, and the at least one first electrode plate form a first capacitor, and the secondary electrode plate, the two conductor plates, and the second electrode plate form a second capacitor;
• the detection circuit is connected to the at least one first electrode plate and the second electrode plate of the main electrode plate, and the detection circuit is configured to detect a capacitance signal of the first capacitor and a capacitance signal of the second capacitor;
• the capacitance signal of the first capacitor and the capacitance signal of the second capacitor are changed when the core shaft reciprocates;
• and
• the at least one first electrode plate comprises two first electrode plates symmetrically arranged on both sides of the second electrode plate, one of the two first electrode plates is separated from the second electrode plate by a first gap, the other one of the two first electrode plates is separated from the second electrode plate by a second gap, and each of the first gap and the second gap extends in a second direction that is different from the first direction.

A key pressing detection method, applicable to a key pressing detection system, wherein the key pressing detection system comprises at least one key, a driving circuit, a detection circuit, and a processing unit;

• each of the at least one key comprising a base and a movement assembly, the movement assembly extending through a top surface of the base and configured to reciprocate in a first direction perpendicular to the top surface, and the movement assembly comprising a core shaft, and two conductor plates opposite to the core shaft and fixed relative to the core shaft;
• the base comprising a casing, a main electrode plate, and a secondary electrode plate both fixed relative to the casing, the two conductor plates being arranged opposite to the main electrode plate and to the secondary electrode plate, the secondary electrode plate, the two conductor plates, and the main electrode plate forming a target capacitor configured to generate capacitance signals that change in response to the core shaft reciprocating;
• wherein the driving circuit is connected to the secondary electrode plate and configured to drive the secondary electrode plate, and the detection circuit is connected to the main electrode plate and configured to detect the capacitance signals of the target capacitor;
• wherein the processing unit is connected to the detection circuit and configured to determine a displacement of the at least one key according to the capacitance signals of the target capacitor;
• wherein each of the two conductor plates is arranged on a respective outer side wall of the core shaft, and the two conductor plates are connected to each other by wires;
• wherein each of the secondary electrode plate and the main electrode plate is arranged on a respective inner side wall of the casing, the secondary electrode plate is arranged opposite to one of the two conductor plates, and the main electrode plate is arranged opposite to the other one of the two conductor plates;
• wherein the main electrode plate comprises at least one first electrode plate and a second electrode plate, the secondary electrode plate, the two conductor plates, and the at least one first electrode plate form a first capacitor, and the secondary electrode plate, the two conductor plates, and the second electrode plate form a second capacitor;
• the detection circuit is connected to the at least one first electrode plate and the second electrode plate of the main electrode plate, and the detection circuit is configured to detect a capacitance signal of the first capacitor and a capacitance signal of the second capacitor;
• the capacitance signal of the first capacitor and the capacitance signal of the second capacitor are changed when the core shaft reciprocates;
• the at least one first electrode plate comprises two first electrode plates symmetrically arranged on both sides of the second electrode plate, one of the two first electrode plates is separated from the second electrode plate by a first gap, and the other one of the two first electrode plates is separated from the second electrode plate by a second gap, and each of the first gap and the second gap extends in a second direction that is different from the first direction;
• and
• wherein the key pressing detection method comprises:
• detecting, by the detection circuit, the capacitance signals generated by the target capacitor;
• and
• determining, by the processing unit, a pressing status of the at least one key based on the changes in the capacitance signals.