A non-contact key device and working method thereof

Abstract

The present invention discloses a non-contact key device and a working method thereof. The non-contact key device comprises a key action detection module, a control module, a key panel module, an execution module, and a touch generation module. When a user operates a non-contact key, the present invention provides airflow feedback to the user's finger similar to the touch of a physical key, so that the user feels that the key has been pressed, which conforms to the characteristics of ergonomics; and when the user's finger travels too far, the user is given a strong pressure airflow to prevent the user from expanding the travel and avoiding contact with the physical key mark, thereby truly realizing "non-contact" and avoiding cross contamination of the physical key.

Description

Technical Field

[0001] The present invention relates to the field of electrical control technology, and in particular to a non-contact key device and a working method thereof. Background Art

[0002] Due to its easy operation, safety and hygiene, non-contact buttons have shown a trend of replacing physical buttons in many occasions, such as the infrared switch of China Patent CN210201806U "A miniaturized infrared switch module" and the elevator button of China Patent CN109319612A "A non-contact intelligent elevator button". In the existing technical solutions, although various non-contact sensors can detect the user's pressing action, they do not give the user the tactile feeling given by the physical button. The lack of tactile feeling makes it impossible for the user to directly feel whether the button has been pressed. The user can only wait for signals such as sound, light or actuator action. For example, China Patent CN110176921A "An infrared switch circuit with state feedback" only gives indicator light feedback. During this waiting process, the user may have directly pressed the physical button, which loses the meaning of "non-contact" of the non-contact button, and the purpose of avoiding cross contamination cannot be achieved. Summary of the invention

[0003] In order to overcome the defects of the prior art, the present invention provides a non-contact key device and a working method thereof, which provide the user with tactile feedback similar to that of using a physical key when the user uses the non-contact key to meet the user's usage habits.

[0004] The technical solution of the present invention is:

[0005] A contactless key device provided by the present invention comprises a key action detection module, a control module, a key panel module, an execution module and a touch generating module; the key action detection module is connected to the control module as the input of the control module; the key panel module is connected to the control module as the output of the control module; the control module is the control center of the device; the touch generating module is connected to the control module as the output of the control module; the execution module is connected to the control module as the output of the control module.

[0006] The key action detection module is used to detect the user's key action, and includes a sensor unit, a signal processing circuit unit and a sensor driving circuit unit. The sensor unit includes an infrared pair of tubes composed of an infrared transmitting tube and an infrared receiving tube, which is installed on the sensor bracket. When the user does not press a key, the infrared signal emitted by the infrared transmitting tube driven by the sensor driving circuit unit is received by the infrared receiving tube; when the user presses a key, the infrared signal emitted by the infrared transmitting tube is blocked, and the infrared receiving tube cannot receive the infrared signal. In this way, the infrared pair of tubes converts the user's key action into an electrical signal, which is amplified and processed by the signal processing circuit unit and then sent to the control module.

[0007] Preferably, the sensor unit can also be composed of a pair of infrared tubes consisting of a first infrared emitting tube and a first infrared receiving tube, and a pair of infrared tubes consisting of a second infrared emitting tube and a second infrared receiving tube, which are installed on the sensor bracket, wherein the infrared tube consisting of the first infrared emitting tube and the first infrared receiving tube is located above the infrared tube consisting of the second infrared emitting tube and the second infrared receiving tube. The infrared tube consisting of the first infrared emitting tube and the first infrared receiving tube is used to detect the user's finger pressing or approaching signal, that is, the pressing stroke start line; the infrared tube consisting of the second infrared emitting tube and the second infrared receiving tube is used to detect whether the user's finger pressing stroke reaches the lower limit, that is, the pressing stroke end line. The space between the pressing stroke start line and the pressing stroke end line constitutes the detection area of ​​the finger action.

[0008] Preferably, the sensor unit may be a proximity sensor such as a photoelectric, capacitive, Hall, ultrasonic, microwave, etc., or a sensor such as a distance sensor, a pyroelectric sensor, a thermopile sensor, etc. that can detect key actions.

[0009] The control module is used to receive input information from the key action detection module, start or shut down the touch generation module, instruct the key panel module to display user key information, communicate with the host computer, and instruct the execution module to complete a specified action.

[0010] The control module includes an interface unit, a control unit, a storage unit, a communication unit, and a driving unit.

[0011] The interface unit is connected to the control unit and serves as an input of the control unit to receive input information of the key action detection module;

[0012] The storage unit is connected to the control unit and stores data for the control unit;

[0013] The communication unit is connected to the control unit, receives instructions from the control unit, and realizes communication with the host computer;

[0014] The driving unit is connected to the control unit, and as the output of the control unit, starts or shuts down the touch generating module, instructs the key panel module to display the user key information, and instructs the execution module to complete the specified action;

[0015] The control unit is the control center of the control module.

[0016] The key panel module is used to indicate key functions and key positions, and display key-related information. For example, when a valid key action is detected, it gives the user a sound or light prompt, and feeds back to the user that the key is successfully pressed. The key panel module includes a key identification unit and an information prompt unit.

[0017] The button identification unit is installed on the button and is used to identify the name or function of the button.

[0018] The information prompt unit is installed around the button, connected to the control module, and receives and displays user prompt information.

[0019] One or more air holes are provided on the key identification unit, serving as air outlets of the touch generating module.

[0020] The execution module receives the instruction from the control module to execute a specified action, such as lighting or turning off a lamp, driving a motor, etc.

[0021] The touch generating module is used to receive the signal from the control module, thereby opening or closing the air path of the compressed air, and the air flow is ejected from the air holes located in the key identification unit, giving the user's fingers a touch feeling similar to that of pressing a physical key.

[0022] The touch-sensing module comprises an electric air pump, an electric air pump driving circuit, an air pipe and a nozzle.

[0023] The electric air pump is electrically connected to the electric air pump driving circuit, and generates compressed air under the drive of the electric air pump driving circuit to provide an air source for the touch generating module.

[0024] The electric air pump driving circuit starts or shuts down the electric air pump according to the signal received from the control module, and controls the air flow and pressure at the air outlet of the electric air pump, thereby controlling whether the nozzle sprays compressed air and the pressure of the sprayed compressed air.

[0025] The air inlet of the electric air pump is directly connected to the atmosphere, and the air outlet is connected to the nozzle through an air pipe.

[0026] The nozzle is installed on the key identification unit, and the nozzle opening is located at the air hole on the key identification unit.

[0027] The touch sensation generating module may also include an external compressed air source, a solenoid valve, a solenoid valve driving circuit, an air pipe and a nozzle.

[0028] The external compressed air source provides compressed air to provide an air source for the touch generating module.

[0029] One end of the solenoid valve is connected to an external compressed air source through an air pipe, and the other end is connected to a nozzle through an air pipe and is electrically connected to a solenoid valve drive circuit.

[0030] The nozzle is installed on the key identification unit, and the nozzle opening is located at the air hole on the key identification unit.

[0031] The solenoid valve driving circuit receives the control signal from the control module, opens and closes the solenoid valve, thereby controlling the opening and closing of the compressed air passage to control whether the nozzle has compressed air ejected.

[0032] Preferably, the solenoid valve is a proportional solenoid valve, which can control the opening and closing degree of the solenoid valve according to the signal received from the control module, thereby controlling the flow rate and pressure of the compressed air sprayed from the nozzle.

[0033] The present invention provides a working method of a non-contact key device, which comprises the following steps:

[0034] S1, detect finger pressing action;

[0035] The key action detection module periodically detects whether there is a pressing action or approaching action of a user's finger, and once a pressing action or approaching action of a user's finger is detected, a signal is sent to the control module.

[0036] S2, driving the touch generating module to eject air flow;

[0037] After the control module receives the user's finger pressing or approaching action information reported by the key action detection module, it immediately drives the touch generating module to open the solenoid valve, and compressed air is ejected from the nozzle at the opening position on the key identification unit. The user's fingers will feel the blowing of the airflow, forming a tactile sensation, and the user will know that the key has been pressed and there is no need to continue the pressing stroke.

[0038] S3, determining the effective pressing action;

[0039] The key action detection module detects that the user's finger presses or approaches the signal for T time, and the control module confirms it as a valid pressing signal. The control module instructs the key panel module to give the user sound, light and other prompts to tell the user that the key is successfully pressed and the user can retract the finger action.

[0040] The time T is determined according to the detection method.

[0041] It should be noted that the tactile sensation generating module continues to emit airflow before the user retracts the finger action, so as to maintain the tactile sensation for the user.

[0042] S4, drive the execution module or report to the host computer.

[0043] After confirming the effective pressing signal, the control module transmits the effective pressing signal to the host computer through the communication unit or directly instructs the execution module to execute a specified action according to the application scenario.

[0044] Furthermore, if the key action detection module detects that the user continues to press the button after the air flow is ejected from the nozzle, the control module drives the tactile sensation generating module to provide an air flow with a higher pressure from the nozzle to further remind the user that the button has been pressed and there is no need to continue pressing the button.

[0045] The beneficial effects of the technology of the present invention are as follows: when a user operates a non-contact key, the present invention provides the user's finger with airflow feedback similar to the touch of a physical key, so that the user feels that the key has been pressed, which conforms to the characteristics of ergonomics. When the user's finger travels too far, the present invention provides the user with airflow with strong pressure to prevent the user from extending the travel and avoiding contact with the physical key mark, thereby truly achieving "non-contact" and avoiding cross contamination of the physical key. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic block diagram of the principle structure of an embodiment of a non-contact key device provided by the present invention;

[0047] Figure 2 It is a schematic block diagram of the principle structure of another embodiment of a non-contact key device provided by the present invention;

[0048] Figure 3 It is a structural side view of an embodiment of a non-contact key device provided by the present invention;

[0049] Figure 4 It is a top view of the structure of a non-contact key device embodiment provided by the present invention;

[0050] Figure 5 The present invention provides a flow chart of a working method of a non-contact key device.

[0051] In the figure:

[0052] 1-Key action detection module;

[0053] 11-sensor unit; 12-signal processing circuit unit; 13-sensor driving circuit unit;

[0054] 111-first infrared transmitting tube; 112-second infrared transmitting tube; 113-sensor bracket; 114-first infrared receiving tube; 115-second infrared receiving tube;

[0055] 2- Control module;

[0056] 21-interface unit; 22-storage unit; 23-control unit; 24-communication unit; 25-drive unit;

[0057] 3- Button panel module;

[0058] 31-button identification unit; 32-information prompt unit;

[0059] 4-Execution module;

[0060] 5-tactile sensation generating module;

[0061] 51-electric air pump; 52-air pipe; 53-solenoid valve; 54-nozzle; 55-solenoid valve drive circuit; 56-electric air pump drive circuit; 311-air hole. DETAILED DESCRIPTION

[0062] The technical solution of the present application is described clearly and completely below in conjunction with the accompanying drawings and embodiments.

[0063] like Figures 1 to 4 As shown, a non-contact key device provided by the present invention includes a key action detection module 1, a control module 2, a key panel module 3, an execution module 4, and a touch generating module 5; the key action detection module 1 is connected to the control module 2 as the input of the control module 2; the key panel module 3 is connected to the control module 2 as the output of the control module 2; the control module 2 is the control center of the device; the touch generating module 5 is connected to the control module 2 as the output of the control module 2; the execution module 4 is connected to the control module 2 as the output of the control module 2.

[0064] The key action detection module 1 is used to detect the key action of the user, and includes a sensor unit 11, a signal processing circuit unit 12 and a sensor driving circuit unit 13. The sensor unit 11 includes a pair of infrared tubes consisting of a first infrared emitting tube 111 and a first infrared receiving tube 114 and a pair of infrared tubes consisting of a second infrared emitting tube 112 and a second infrared receiving tube 115, and is installed on a sensor bracket 113, wherein the infrared tubes consisting of the first infrared emitting tube 111 and the first infrared receiving tube 114 are above the infrared tubes consisting of the second infrared emitting tube 112 and the second infrared receiving tube 115. The sensor driving circuit unit 13 drives the first infrared emitting tube 111 and the second infrared emitting tube 112 to emit infrared light signals. When the user does not press a key, the first infrared receiving tube 114 receives the infrared light signal emitted by the first infrared emitting tube 111, and the second infrared receiving tube 115 receives the infrared light signal emitted by the second infrared emitting tube 112. When the user presses a key, the finger blocks the infrared signal emitted by the first infrared emitting tube 111 or the second infrared emitting tube 112, and the first infrared receiving tube 114 or the second infrared receiving tube 115 cannot receive the infrared signal. In this way, the infrared tubes convert the user's key action into an electrical signal, which is amplified and processed by the signal processing circuit unit 12 and then sent to the control module 2.

[0065] Furthermore, the infrared pair consisting of the first infrared emitting tube 111 and the first infrared receiving tube 114 is used to detect the user's finger pressing or approaching signal, that is, the pressing stroke start line; the infrared pair consisting of the second infrared emitting tube 112 and the second infrared receiving tube 115 is used to detect whether the user's finger pressing stroke reaches the lower limit, that is, the pressing stroke end line. The space between the pressing stroke start line and the pressing stroke end line constitutes the detection area of ​​the finger action.

[0066] The control module 2 is used to receive input information from the key motion detection module 1, start or shut down the touch generation module 5, instruct the key panel module 3 to feedback key information to the user, communicate with the host computer, and instruct the execution module 4 to complete the specified action. The control module 2 includes an interface unit 21, a storage unit 22, a control unit 23, a communication unit 24, and a drive unit 25.

[0067] The interface unit 21 is connected to the control unit 23 and serves as an input of the control unit 23 to receive input information of the key action detection module 1;

[0068] The storage unit 22 is connected to the control unit 23 and stores data for the control unit 23;

[0069] The communication unit 24 is connected to the control unit 23, receives instructions from the control unit 23, and realizes communication with the host computer;

[0070] The driving unit 25 is connected to the control unit 23, and as the output of the control unit 23, starts or shuts down the touch generating module 5, instructs the key panel module 3 to display the user key information, and instructs the execution module 4 to complete the specified action;

[0071] The control unit 23 is the control center of the control module 2 .

[0072] The key panel module 3 is used to indicate key functions and key positions, and to display key-related information. For example, when a valid key action is detected, the module gives the user a sound or light prompt, and gives feedback to the user that the key is successfully pressed. The key panel module 3 includes a key identification unit 31 and an information prompt unit 32.

[0073] The key identification unit 31 is installed on the key and is used to identify the name or function of the key.

[0074] The information prompt unit 32 is installed around the button, connected to the control module 2, and receives and displays user prompt information.

[0075] The button identification unit 31 is provided with an air hole 311 which serves as an outlet for the compressed air of the touch generating module 5 .

[0076] The key identification unit 31 is lower than the installation height of the second infrared emitting tube 112 and the second infrared receiving tube 115 .

[0077] The execution module 4 receives the instruction from the control module 2 to execute a specified action, such as lighting or turning off a lamp, driving a motor, etc.

[0078] The touch generating module 5 is used to receive the signal from the control module 2, thereby opening or closing the air path of the compressed air, and the air flow is ejected from the air hole 311 located in the key identification unit 31, giving the user's finger a touch feeling similar to that of pressing a physical key.

[0079] like Figure 1 As shown, the touch sensation generating module 5 includes an electric air pump 51 , an air pipe 52 , an electric air pump driving circuit 56 , and a nozzle 54 .

[0080] The electric air pump 51 is electrically connected to the electric air pump driving circuit 56 , and generates compressed air under the drive of the electric air pump driving circuit 56 to provide an air source for the touch generating module 5 .

[0081] The electric air pump driving circuit 56 starts or shuts down the electric air pump 51 according to the signal received from the control module 2, and controls the air flow and pressure at the air outlet of the electric air pump 51, thereby controlling whether the nozzle 54 ejects compressed air and the pressure of the ejected compressed air.

[0082] The air inlet of the electric air pump 51 is directly connected to the atmosphere, and the air outlet is connected to the nozzle 54 through the air pipe 52.

[0083] The nozzle 54 is mounted on the key identification unit 31 , and the opening of the nozzle 54 is located at the air hole 311 on the key identification unit 31 .

[0084] like Figure 2 As shown, the touch generating module 5 includes an external compressed air source, a solenoid valve 53 , a solenoid valve driving circuit 55 , an air pipe 52 and a nozzle 54 .

[0085] The external compressed air source provides compressed air to provide an air source for the touch generating module 5. One end of the solenoid valve 53 is connected to the external compressed air source through an air pipe 52, and the other end is connected to the nozzle 54 through the air pipe 52, and is electrically connected to the solenoid valve driving circuit 55.

[0086] The nozzle 54 is mounted on the key identification unit 31 , and the opening of the nozzle 54 is located at the air hole 311 on the key identification unit 31 .

[0087] Preferably, the solenoid valve 53 is a proportional pressure solenoid valve or a proportional flow solenoid valve, which can not only control the opening and closing of the compressed air passage, but also control the pressure and flow of the compressed air sprayed out by the nozzle 54 .

[0088] like Figure 5 As shown, the working method of a non-contact key device provided by the present invention has the following working process:

[0089] S1, detect finger pressing action;

[0090] The key action detection module 1 periodically detects whether there is a user's finger pressing action or approaching action. When the infrared ray emitted by the first infrared emitting tube 111 is blocked by the user's finger, the first infrared receiving tube 114 cannot detect the infrared ray emitted by the first infrared emitting tube 111, and the key action detection module 1 sends a signal to the control module 2.

[0091] In this embodiment, the infrared wavelength is 940nm or 850nm.

[0092] S2, driving the touch generating module 5 to eject air flow;

[0093] After receiving the user's finger pressing or approaching action information reported by the key action detection module 1, the control module 2 immediately drives the touch generating module 5, opens the solenoid valve 53, and compressed air is ejected from the nozzle 54 at the air hole 311 on the key identification unit 31. The user's fingers will feel the blowing of the airflow, forming a tactile sensation, and the user will know that the key has been pressed and there is no need to continue the pressing stroke.

[0094] S3, determining the effective pressing action;

[0095] The key action detection module 1 detects that the user's finger presses or approaches the signal for T time, and the control module 2 confirms it as a valid pressing signal. The control module 2 instructs the key panel module 3 to give the user sound, light and other prompts to tell the user that the key is successfully pressed and the user can retract the finger action.

[0096] The length of the time T is determined according to the detection method, and is determined to be 100-200 ms in this embodiment, starting from when the first infrared receiving tube 114 cannot detect the infrared signal emitted by the first infrared emitting tube 111 .

[0097] It should be noted that the tactile sensation generating module 5 continues to emit airflow before the user retracts the finger, so as to maintain the tactile sensation for the user.

[0098] S4, drive execution module 4 or report to the upper computer.

[0099] After confirming the effective pressing signal, the control module 2 transmits the effective pressing signal to the host computer through the communication unit 24 or directly instructs the execution module 4 to execute a specified action according to the application scenario.

[0100] Furthermore, if the infrared light emitted by the second infrared emitting tube 112 is blocked by the user's finger and the second infrared receiving tube 115 cannot receive the infrared light signal emitted by the second infrared emitting tube 112, and the user's pressing stroke reaches the end line of the stroke, the control module 2 drives the touch generating module 5 to provide an air flow with a higher pressure from the nozzle 54 to further remind the user that the button has been pressed and there is no need to continue pressing the stroke.

[0101] The non-contact key device provided by the present invention provides airflow feedback to the user's finger when the user operates the non-contact key, which is similar to the touch of a physical key, so that the user feels that the key has been pressed, which meets the characteristics of ergonomics. When the user's finger travels too far, the user is given a strong airflow to prevent the user from extending the travel and avoiding contact with the physical key mark, thereby truly achieving "non-contact" and preventing cross contamination of the physical key.

[0102] The above embodiments describe the present invention in conjunction with the accompanying drawings, but this should not be understood as limiting the patent scope of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A non-contact key device, characterized in that: It includes a key action detection module, a control module, a key panel module, an execution module, and a touch generation module; the key action detection module is connected to the control module as the input of the control module; the key panel module is connected to the control module as the output of the control module; the control module is the control center of the device; the touch generation module is connected to the control module as the output of the control module; the execution module is connected to the control module as the output of the control module; The key panel module is used to indicate the key function and key position, and display key-related information. For example, when an effective key action of the user is detected, a sound or light prompt is given to the user, and feedback is given to the user that the key is successfully pressed; the key panel module includes a key identification unit and an information prompt unit; the key identification unit is installed on the key and is used to identify the name or function of the key; the information prompt unit is installed around the key, connected to the control module, and receives and displays user prompt information; one or more air holes are opened on the key identification unit as the air outlet of the touch generating module; the touch generating module is used to receive the signal of the control module, thereby opening or closing the air path of compressed air, and the air flow is ejected from the air holes located in the key identification unit, giving the user's fingers a tactile sensation similar to that when a physical key is pressed; The touch generating module includes an electric air pump, an electric air pump driving circuit, an air pipe and a nozzle; the electric air pump is electrically connected to the electric air pump driving circuit, and generates compressed air under the drive of the electric air pump driving circuit to provide an air source for the touch generating module; the electric air pump driving circuit starts or shuts down the electric air pump according to the signal received from the control module, and controls the air flow and pressure of the air outlet of the electric air pump, so as to control whether the nozzle has compressed air ejected and the pressure of the ejected compressed air; the air inlet of the electric air pump is directly connected to the atmosphere, and the air outlet is connected to the nozzle through an air pipe; the nozzle is installed on the key identification unit, and the nozzle opening is located at the air hole on the key identification unit; Or the touch-sensing module includes an external compressed air source, a solenoid valve, a solenoid valve driving circuit, an air pipe and a nozzle; the external compressed air source provides compressed air to provide an air source for the touch-sensing module; one end of the solenoid valve is connected to the external compressed air source through an air pipe, and the other end is connected to the nozzle through the air pipe, and is electrically connected to the solenoid valve driving circuit; the nozzle is installed on the key identification unit, and the nozzle opening is located at the opening on the key identification unit; The solenoid valve driving circuit receives the control signal from the control module, opens and closes the solenoid valve, thereby controlling the opening and closing of the compressed air passage to control whether the nozzle has compressed air ejected; The execution module receives the instruction from the control module and executes a specified action.

2. The non-contact key device according to claim 1, characterized in that: The key action detection module is used to detect the user's key action; the key action detection module includes a sensor unit, a signal processing circuit unit and a sensor driving circuit unit; the sensor unit includes an infrared pair of tubes composed of an infrared transmitting tube and an infrared receiving tube, which is installed on the sensor bracket; when the user does not press the key, the sensor driving circuit unit drives the infrared transmitting tube to emit an infrared signal which is received by the infrared receiving tube; when the user presses the key, the infrared signal emitted by the infrared transmitting tube is blocked, and the infrared receiving tube cannot receive the infrared signal; thus, the infrared pair of tubes converts the user's key action into an electrical signal, which is amplified and processed by the signal processing circuit unit and then sent to the control module.

3. The non-contact key device according to claim 2, characterized in that: The sensor unit includes a pair of infrared tubes consisting of a first infrared emitting tube and a first infrared receiving tube and a pair of infrared tubes consisting of a second infrared emitting tube and a second infrared receiving tube, which are installed on a sensor bracket, wherein the infrared tubes consisting of the first infrared emitting tube and the first infrared receiving tube are located above the infrared tubes consisting of the second infrared emitting tube and the second infrared receiving tube; the infrared tubes consisting of the first infrared emitting tube and the first infrared receiving tube are used to detect the user's finger pressing or approaching signal, that is, the pressing stroke start line; the infrared tubes consisting of the second infrared emitting tube and the second infrared receiving tube are used to detect whether the user's finger pressing stroke reaches the lower limit, that is, the pressing stroke end line; the space between the pressing stroke start line and the pressing stroke end line constitutes the detection area of ​​the finger movement.

4. The non-contact key device according to claim 1, characterized in that: The control module is used to receive the input information of the key action detection module, start or shut down the tactile generation module, instruct the key panel module to display user key information, communicate with the host computer, and instruct the execution module to complete the specified action; the control module includes an interface unit, a control unit, a storage unit, a communication unit, and a drive unit; the interface unit is connected to the control unit as an input of the control unit and is used to receive the input information of the key action detection module; the storage unit is connected to the control unit and stores data for the control unit; the communication unit is connected to the control unit and receives the instructions of the control unit to realize communication with the host computer; the drive unit is connected to the control unit as an output of the control unit, starts or shuts down the tactile generation module, instructs the key panel module to display user key information, and instructs the execution module to complete the specified action; the control unit is the control center of the control module.

5. A working method of the non-contact key device according to any one of claims 1 to 4, characterized in that: It includes the following steps: S1, detect finger pressing action; The key action detection module periodically detects whether there is a user's finger pressing action or approaching action, and once a user's finger pressing action or approaching action is detected, a signal is sent to the control module; S2, driving the touch generating module to eject air flow; After receiving the user's finger pressing or approaching action information reported by the key action detection module, the control module immediately drives the touch generating module to open the solenoid valve, and the compressed air is ejected from the opening position of the nozzle on the key identification unit. The user's finger will feel the blowing of the airflow, forming a feeling similar to touch, and the user will know that the key has been pressed and there is no need to continue the pressing stroke; S3, determining the effective pressing action; The key action detection module detects that the user's finger presses or approaches the signal for a period of T, and the control module confirms it as a valid press signal. The control module instructs the key panel module to give the user an audio and visual prompt to tell the user that the key is successfully pressed, and the user retracts the finger action; S4, drive the execution module or report to the upper computer; After confirming the effective pressing signal, the control module transmits the effective pressing signal to the host computer through the communication unit or directly instructs the execution module to execute a specified action according to the application scenario.

6. The working method of the non-contact key device according to claim 5, characterized in that: When the key action detection module detects that the user continues to press the key after the airflow is ejected from the nozzle, the control module drives the tactile sensation generating module to provide an air flow with a higher pressure from the nozzle to further remind the user that the key has been pressed and there is no need to continue pressing the key.

7. The working method of the non-contact key device according to claim 5, characterized in that: The tactile sensation generating module continues to emit airflow before the user retracts the finger action, so as to maintain the tactile sensation for the user.

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