CN113445259A

CN113445259A - Key structure, key structure control method and washing machine

Info

Publication number: CN113445259A
Application number: CN202110754883.5A
Authority: CN
Inventors: 唐吉林; 刘娟娟; 周智博; 孙延芬; 张璇; 惠浩然
Original assignee: Hisense Shandong Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-28
Anticipated expiration: 2041-06-29
Also published as: CN113445259B

Abstract

The application belongs to the technical field of household appliances and provides a key structure, a key structure control method and a washing machine. The key structure comprises a printed circuit board, a signal induction part and a conductive part, wherein the signal induction part comprises a conductive disc and an inductance coil which are arranged at intervals; the conductive part and the signal sensing part are arranged oppositely in a first direction, and the conductive part can move towards the direction close to the signal sensing part; the method comprises the following steps that in the process that a conductive part moves towards the direction close to a signal induction part, a first signal is generated between an inductance coil and the conductive part, and the first signal changes along with the change of the distance between the inductance coil and the conductive part; when the conductive member moves to a position where it is simultaneously in contact with the inductive coil and the conductive pad, the conductive pad and the inductive coil conduct to generate a second signal. The signal dual-induction detection is realized through the change conditions of the first signal and the second signal, so that the reliability of key control and user experience are improved.

Description

Key structure, key structure control method and washing machine

Technical Field

The application belongs to the technical field of household appliances, and particularly relates to a key structure, a key structure control method and a washing machine.

Background

Nowadays, more and more household appliances and lower stability of power grid voltage are provided, and higher requirements are provided for the anti-interference performance of the household appliances. The household appliances take a washing machine as an example, and along with the intelligent development of the washing machine, the washing machine is generally provided with a main control board, keys are arranged on the main control board, and a user controls the washing machine to start or select corresponding functions and washing parameters through the keys when using the washing machine.

In the existing key structure, a capacitive key is widely used, and a user touches the capacitive key, so that an electric appliance responds to touch and controls a load indicated by the key to act. Under high temperature or high humidity environment, due to the influence of the environment on the electric charge, when the user does not touch the key, the electric appliance sometimes misjudges that the key is touched and misresponds, so that the electric appliance miscontrols the load to act automatically when the user does not touch the key, and bad use experience is caused to the user.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.

Disclosure of Invention

The application aims to provide a key structure, a control method and a washing machine, which can improve the touch response accuracy of the key structure.

Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.

According to an aspect of an embodiment of the present application, there is provided a key structure including:

a printed wiring board;

the signal induction part comprises a conductive disc and an inductance coil, the conductive disc and the inductance coil are electrically connected on the printed circuit board, and the conductive disc and the inductance coil are arranged at intervals;

the conductive part is arranged opposite to the signal sensing part in a first direction, is positioned on one side of the signal sensing part far away from the printed circuit board and can move towards the direction close to the signal sensing part; wherein,

generating a first signal between the inductance coil and the conductive member during the movement of the conductive member to a direction close to the signal induction member, wherein the first signal varies with a change in a distance between the inductance coil and the conductive member;

when the conductive member moves to a position where it simultaneously contacts the inductive coil and the conductive pad, the conductive pad and the inductive coil conduct to generate a second signal.

In an exemplary embodiment of the disclosure, the key structure further includes an elastic member mounted on the printed circuit board, the elastic member includes a main body portion, a hollow area is formed inside the main body portion, the hollow area includes a first hollow area and a second hollow area, the second hollow area is located on a side of the first hollow area close to the printed circuit board, the conductive member is located in the first hollow area and attached to an inner surface of the elastic member, and the inductance coil and the conductive pad are located in the second hollow area.

In an exemplary embodiment of the present disclosure, in an orthographic projection taken in the first direction, an outline of the first hollow region is located inside an outline of the second hollow region.

In an exemplary embodiment of the present disclosure, a length of the conductive member is equal to a length of the first hollow region in a second direction, wherein the second direction is perpendicular to the first direction.

In an exemplary embodiment of the present disclosure, in an orthographic projection obtained in the first direction, an outline of the first hollow region is located between an inner circle of the inductance coil and an outer circle of the inductance coil.

In an exemplary embodiment of the present disclosure, an outer side wall of the main body portion is a stepped surface, and sizes of the main body portion in a second direction are sequentially reduced from the second hollow region to the first hollow region, and the second direction is perpendicular to the first direction.

In an exemplary embodiment of the present disclosure, the elastic member further includes a fixing portion integrally connected to the main body portion, and the fixing portion is fitted on the printed circuit board and fixed to the printed circuit board by a fixing member.

In an exemplary embodiment of the disclosure, the key structure further includes a control circuit and a panel, the panel is covered on the printed circuit board, the signal induction component and the conductive component are disposed in an accommodating cavity of the panel, and the control circuit is electrically connected to the inductance coil and the conductive pad, and is configured to receive the first signal and the second signal to control the key structure to indicate a load.

According to an aspect of an embodiment of the present application, there is provided a washing machine including the key structure as described above.

According to an aspect of the embodiments of the present application, there is provided a key structure control method, applied to the key structure described above, including:

receiving a first signal generated between an inductor coil and a conductive member, the first signal varying as a distance between the inductor coil and the conductive member varies;

receiving a second signal generated when the conductive member moves to a position where the conductive member simultaneously contacts the inductive coil and the conductive pad, the conductive pad and the inductive coil being conducted;

and controlling the key structure to indicate a load according to the first signal and the second signal.

In the technical solution provided by the embodiment of the present application, the key structure includes a signal sensing component and a conductive component, when a panel is not pressed, the signal sensing component and the conductive component are arranged oppositely, a first signal is generated between the conductive component and an inductance coil of the signal sensing component, when the panel is pressed, the conductive component can move towards a direction close to the signal sensing component, the generated first signal changes along with the change of the distance between the conductive component and the signal sensing component, when the conductive component contacts the signal sensing component, the conductive plate and the inductance coil are connected to generate a second signal, and whether the key is pressed or not is determined by combining the change conditions of the first signal and the second signal, so that the problem of mistaken touch such as space touch can be avoided, and the situation that a user does not touch the panel is prevented, the condition that the key is touched and therefore the false response occurs is judged by mistake, and the reliability of key control and the user experience are improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 schematically illustrates a connection diagram of a whole washing machine to which a key structure provided by an embodiment of the present disclosure belongs.

Fig. 2 schematically illustrates an assembly cross-sectional view of a key structure according to an embodiment of the present disclosure.

Fig. 3 schematically illustrates a top view schematic diagram of a display panel of a washing machine according to an embodiment of the present disclosure.

Fig. 4 schematically illustrates a schematic diagram of an inductor coil according to an embodiment of the present disclosure.

Fig. 5 schematically illustrates a schematic diagram of an inductor coil according to another embodiment of the present disclosure.

Fig. 6 schematically illustrates an inductor coil schematic of yet another embodiment of the present disclosure.

Fig. 7 schematically shows a flowchart of a key structure control method according to an embodiment of the present disclosure.

Fig. 8 schematically illustrates a hardware detection circuit diagram of an embodiment of the present disclosure.

Fig. 9 schematically shows a detailed processing flowchart of a key structure control method according to an embodiment of the present disclosure.

Description of reference numerals: 1-screen printing a coating on a panel; 2-plastic organic glass; 3-shielding the ink; 4-an insulating interlayer; 5-pressing part; 6-connecting strips; 7-an elastic member; 71-a main body portion; 721-a first hollow area; 722-a second hollow region; 73-a fixed part; 8-a conductive member; 10-an inductor coil; 11-a conductive pad; 12-a printed wiring board; 13-fixing a blocking rib; 14-resistance; 15-capacitance; 16-preprocessing the chip; 17-a master chip; 31-a display screen; 32-knob.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.

The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

The existing key structure commonly used comprises a touch key and a single mechanical key, and the capacitive touch application is wide, the touch key takes a capacitive touch key as an example, and the capacitive touch key identifies whether the touch key is pressed or not according to the change of a single capacitance value so as to adjust the display and the load action of the whole machine. To single mechanical button, single mechanical button uses more, and it is according to pressing to realize switching on and shutting down, and general structure is mostly the stereoplasm structure. The capacitive touch key and single mechanical key structure basically realize signal triggering through the contact or pressing of a plastic panel (acrylic and the like) and a signal detection module.

The existing key structure has the following problems: for a touch key, in a high-temperature or humid area, the mainstream touch machine type is easy to generate misoperation and error display, and part of the machine types can reach 20 percent, so that the use of a user is influenced. In addition, when the power grid is unstable or a plurality of electric appliances work simultaneously, current interference may cause the touch machine type to have a key misoperation problem, so that an interface is displayed by mistake or an invalid buzzer is generated. The touch key is also exemplified by a capacitive touch key, and therefore, it can be known that the capacitive touch mode is relatively greatly influenced by environmental factors such as temperature, humidity and the like, and a problem of false triggering can occur.

For a single mechanical key structure, the problems of structure clamping stagnation, no triggering and the like can occur after the single mechanical key is used for a long time; in addition, when the whole machine parts are used and assembled, the effective touch distances of the parts at different positions cannot be completely consistent, so that the touch effect between machines is greatly different.

To the above situation, the application provides a solution idea for judging whether the key is pressed down by using dual-signal induction detection. Compared with the scheme of a capacitive touch key and a single mechanical key structure, the touch error problem such as air touch is avoided, and the reliability of key control and user experience are improved.

Referring to fig. 1, fig. 1 schematically illustrates a connection diagram of a whole washing machine to which a key structure provided by an embodiment of the present disclosure belongs.

The washing machine includes various component circuits including: the device comprises a heating wire driving and detecting circuit connected with the heating wire, a door lock driving and detecting circuit connected with a door lock, a motor driving and detecting circuit connected with a motor, a valve pump driving circuit connected with a water valve and a drainage pump, a power module circuit externally connected with a filter, a drying module circuit connected with a drying system, a water level and temperature detecting circuit connected with a temperature detector and a water level sensor, and other load driving circuits connected with modules such as a down lamp, an ultraviolet lamp and an automatic throwing module. The various component circuits are controlled by the main control circuit of the washing machine (the main control circuit is also used as a control unit of the keys).

The washing machine also comprises a structural panel, a signal detection circuit, a touch chip processing circuit and a main chip processing circuit, and the washing machine can work normally through the cooperation of all the modules. It should be noted that the structural panel of the washing machine includes the key structure provided by the present application, the key structure can move up and down, when no finger is pressed, the position of the key structure remains unchanged, and when the finger is pressed, the structural key is pressed down. The signal detection circuit, the touch chip processing circuit and the main chip processing circuit may be part of a key structure, or may be integrated with other structures of the washing machine, which is not limited herein.

A detailed description of a key structure provided in the present application is provided below with reference to specific embodiments.

Referring to fig. 2, fig. 2 schematically illustrates an assembled cross-sectional view of a key structure according to an embodiment of the present disclosure.

The application provides a button structure, button structure includes: a printed wiring board 12, a signal sensing part and a conductive part 8, the printed wiring board 12 being for providing electrical connection of the key structure; the signal sensing part is arranged on the printed circuit board 12, the conductive part 8 and the signal sensing part are arranged oppositely in the first direction Z and are positioned on one side of the signal sensing part far away from the printed circuit board, and the conductive part 8 can move towards the direction close to the signal sensing part.

The signal induction part comprises a conductive disc 11 and an inductance coil 10, the conductive disc 11 and the inductance coil 10 are electrically connected on a printed circuit board 12, and the conductive disc 11 and the inductance coil 10 are arranged at intervals.

In the technical scheme provided by the embodiment of the application, the conductive part 8 is arranged inside the panel, and the conductive part 8 can move along with the downward pressing of the panel. When the panel is not pressed, the conductive part 8 does not move, the signal induction part and the conductive part 8 are oppositely arranged, the inductance value is generated by the inductance coil 10, and a first signal is generated between the conductive part 8 and the inductance coil 10 of the signal induction part; after the panel is pressed, the conductive component 8 can move towards the direction close to the signal induction component to generate a first signal, and the first signal changes along with the change of the distance between the conductive component 8 and the inductance coil 10, and a self-generated magnetic field is generated along with the movement of the conductive component 8, so that the primary magnetic field of the inductance coil 10 is changed, and the inductance of the inductance coil 10 changes, namely the first signal changes; when the conductive part 8 is in contact with the signal sensing part, the conductive disc 11 is connected with the inductance coil 10 to generate a second signal, and whether the key is pressed or not is judged by combining the change conditions of the first signal and the second signal, so that the problem of mistaken touch such as spaced touch can be avoided, the condition that the key is touched and mistaken response is avoided when a user does not touch the panel is avoided, and the reliability of key control and the user experience are improved.

In one embodiment, the panel is made of a material (plastic organic glass, etc.) without containing conductive components or electric charges, wherein the panel is a contact interface of the key structure. Specifically, the panel includes pressing portion 5 and a supporting portion, the supporting portion is disposed on both sides of pressing portion 5, pressing portion 5 is disposed above conductive member 8, the supporting portion and pressing portion 5 are connected by connecting bar 6, pressing portion 5 can be pressed down by force.

Explain with the supporting part of one side, the supporting part is including the panel silk screen printing picture layer 1, the plastic organic glass 2 that stack gradually the setting, shelters from printing ink 3, insulating interlayer 4, and wherein, plastic organic glass 2 is the smooth panel of complete insulation, and plastic organic glass 2's thickness is thickest for the thickness of other three-layers, shelters from oil reservoir 3 and is provided with printing ink, and the degree of depth of printing ink can shelter from inside device, and makes inside device not expose. In addition, the supporting part also comprises a fixed blocking rib 13, and the fixed blocking rib 13 is arranged between the insulating interlayer 4 and the printed circuit board 12 to ensure the distance between the insulating interlayer 4 and the printed circuit board and the key stroke.

With regard to the arrangement of the conductive member 8, the material of the conductive member 8 may be a metal material, or other conductive materials, and the material of the conductive member 8 is not limited herein as long as the connection between the conductive pad 11 and the inductance coil 10 can be achieved. Further, the shape of the conductive member 8 may be circular, square, or other shapes, and it is sufficient that the connection between the conductive plate 11 and the inductance coil 10 can be achieved, and is not limited thereto.

For the arrangement of the Printed Circuit Board 12, specifically, the Printed Circuit Board (PCB) 12 is used as the carrier for electrical connection, the inductor 10 and the conductive plate 11 are both arranged on the Printed Circuit Board, there is a gap between the inductor 10 and the conductive plate 11, and the inductor 10 and the conductive plate 11 are not conductive.

In order to facilitate understanding of the key structure, the working principle is further elaborated, and the working principle is as follows: when the panel is pressed without external force, the conductive part 8 does not move, a preset distance is reserved between the conductive part 8 and the signal induction part, a first signal is generated between the conductive part 8 and the inductance coil 10, and the magnetic field and the inductance value generated by the inductance coil 10 are unchanged, namely the inductance value and the magnetic field of the inductance coil 10 are stable when the panel is not operated; when an external force presses the panel, the panel deforms, so that the conductive part 8 moves towards the direction close to the signal induction part, the conductive part 8 generates a self-generated magnetic field when moving downwards, the primary magnetic field of the inductance coil is further changed, the change of the electric field and the equivalent inductance value of the inductance coil is caused, the first signal changes along with the change, when the conductive part 8 moves to be in contact with the printed circuit board 12, the inductance coil 10 is connected with the conductive disc 11, and the second signal is generated, therefore, when the first signal and the second signal both change, the fact that the key structure is pressed down is confirmed. When only the first signal changes or only the second signal changes, the key structure is not pressed, and the load cannot be triggered to work.

In the scheme of this application, press the panel when external force, the panel produces deformation, transmits the semaphore rapidly, and through the response mode of perception and mechanical button like this, must point to press the panel and produce deformation and just can confirm the button structure and be pressed when changing the magnetic field feel value, can avoid the problem of separating the touch like this, improve user experience. In addition, it should be noted that, for the key structure of the present application, because the temperature and humidity have little influence on the sensitivity and the mechanical structure, the key structure of the present application can enable the whole machine to normally operate even in a high-temperature and high-humidity environment.

To facilitate understanding of the specific location of the key structure of the present application in the washing machine, referring to fig. 3, fig. 3 schematically illustrates a schematic top view of a display panel of the washing machine according to an embodiment of the present disclosure. Washing machine's display panel part includes display screen 31, button structure and knob 32, and display screen 31 is used for showing present washing machine's operating condition, and knob 32 is used for adjusting the washing gear, and wherein the button corresponds the button structure of this application, and the button structure through this application control washing machine starts or selects corresponding function, washing parameter.

In one embodiment, the key structure further comprises a resilient member 7, the resilient member 7 being mounted on the printed circuit board 12. The elastic member 7 includes a main body portion 71, a hollow region is formed inside the main body portion 71, the hollow region 72 includes a first hollow region 721 and a second hollow region 722, the second hollow region 722 is located on a side of the first hollow region 721 close to the printed wiring board 12, the conductive member 8 is located in the first hollow region 721 and attached to an inner surface of the elastic member 7, and the inductance coil 10 and the conductive pad 11 are located in the second hollow region.

Wherein, elastic component 7 is flexible rubber, has certain elasticity, and elastic component 7's shape sets up to the shape that can buckle, and the elastic component of being convenient for takes place deformation and recovery like this, can move down when having external force promptly, can kick-back when having no external force.

Wherein the first hollow region 721 and the second hollow region 722 are communicated with each other, and the cross-sectional shapes of the first hollow region 721 and the second hollow region 722 are both rectangular. The thickness of the first hollow region 721 is greater than that of the second hollow region 722 in the first direction Z, and the length of the first hollow region 721 is less than that of the second hollow region 722 in the second direction X, which is perpendicular to the first direction Z.

The conductive member 8 is exemplified by a metal disk, an upper surface of the metal disk is in contact with an inner surface of the elastic member 7, the conductive member 8 is fixed to the inner surface of the elastic member 7, and when the elastic member 7 is automatically restored to be deformed, the conductive member 8 moves in the first hollow area 721 and the second hollow area 722 along with the movement.

In this way, by arranging the conductive part 8 in the elastic part 7, when the elastic part is pressed down without external force and automatically recovers deformation, the conductive part 8 moves along with the elastic part 7 in the direction away from the inductance coil 10, so that the situation of misjudgment caused by untimely resetting of the conductive part 8 is prevented, the sensitivity of the key structure is improved, and the sensitivity is high. Of course, it is also possible to configure the conductive member 8 itself to have elasticity so as to be automatically restored when it is pressed without an external force, without attaching to an additional elastic member.

In an embodiment, in an orthographic projection taken in the first direction Z, the contour line of the first hollow region 721 is located inside the contour line of the second hollow region 722.

Thus, when the conductive member 8 moves in a direction approaching the inductor 10, the moving path of the conductive member 8 is defined in a relatively fixed space, facilitating conductive connection between the conductive plate 11 and the inductor 10. The conducting part 8 is prevented from generating large deviation in the moving process path, so that the conducting disc 11 and the inductance coil 10 cannot be connected and conducted, a second signal cannot be generated, the detection result is deviated, and the misjudgment of the detection result is caused.

In an embodiment, in the second direction X, the length of the conductive component 8 is equal to the length of the first hollow area 721, that is, the conductive component 8 fills the first hollow area 721 in the second direction X, since the first hollow area 721 is located in the orthographic projection of the second hollow area 722, the conductive component 8 makes it easier to connect and conduct the inductance coil 10 and the conductive pad 11, thereby avoiding the occurrence of the situation that the panel is pressed down and deformed without generating the second signal, and improving the accuracy of the key structure.

In an embodiment, in an orthographic projection taken in the first direction Z, the contour line of the first hollow region 721 is located between the inner circle of the inductor 10 and the outer circle of the inductor 10. Thus, even if the conductive member is partially displaced, the inductance coil and the conductive pad can be electrically connected, and the possibility of erroneous judgment can be prevented.

In an embodiment, the outer sidewall of the main body portion 71 is a stepped surface, and the size of the main body portion 71 in the second direction X is sequentially reduced in a direction from the second hollow region 722 to the first hollow region 721, and the second direction X is perpendicular to the first direction Z.

In this way, the elastic member is formed in a stepped structure, and the elastic member is arranged vertically, so that the conductive member can be prevented from being deviated when moving in a direction close to the inductor coil, and the second signal cannot be generated even if the conductive member is pressed downward, and the load execution action cannot be triggered.

In one embodiment, the elastic component 7 further includes a fixing portion 73, the fixing portion 73 is integrally connected to the main body portion 71, and the fixing portion 73 is embedded in the printed circuit board 12 and fixed to the printed circuit board 12 by a fixing member.

Since the elastic component 7 has a certain elasticity, in order to ensure the stability of the elastic component 7, the fixing part 73 of the elastic component 7 is embedded on the printed circuit board 12 and is fixed by the fixing part, so that the key structure is prevented from being in poor contact due to the looseness of the elastic component after being pressed for multiple times. The fixing piece can be fixed by additionally arranging a structure, and can also be fixed on the printed circuit board by welding or bonding.

Regarding the arrangement of the conductive disc 11 and the inductance coil 10, referring to fig. 4, fig. 4 schematically shows a schematic diagram of an inductance coil according to an embodiment of the present disclosure. In an embodiment, the conductive pad 11 is arranged in the center of the inductor 10, and the length of the conductive part 8 in the second direction X is larger than the distance between the conductive pad 11 and the inductor 10.

The shape of the inductor 10 is configured as shown in fig. 4 to 6, for example, a circle, a square or a polygon, for generating resonance, which generates the first signal. The position arrangement of the inductance coil 10 and the conductive disc 11 can be set to different shapes according to actual needs.

The conductive pad 11 may be a solid copper foil, and is disposed in the center of the inductance coil 10, which is not shown in the figure, and the conductive pad 11 may be soldered on the printed circuit board 12 by a soldering method, or may be fixed on the printed circuit board 12 by other methods, which is not limited herein. The conductive plate 11 is spaced from the inductor 10 by a distance smaller than the inner diameter as shown in the drawing, and in one inductor 10, the distance between adjacent coils is a line distance, and the width of each coil becomes a line width.

In this way, by disposing the conductive pad 11 at the center of the inductor 10, the length of the conductive member 8 in the second direction X is greater than the distance between the conductive pad 11 and the inductor 10, so that even if the conductive member 8 is partially displaced, the inductor 10 and the conductive pad 11 can be connected and conducted.

In an embodiment, the key structure further includes a control circuit, the panel is covered on the printed circuit board, the signal sensing part and the conductive part 8 are disposed in the accommodating cavity of the panel, and the control circuit is electrically connected to the inductance coil 10 and the conductive pad 11, and is configured to receive the first signal and the second signal to control the key structure to indicate the load.

Specifically, the control circuit includes a preprocessing chip 16 and a main chip 17, and the preprocessing chip 16 is used for detecting the first and second signals to perform preprocessing identification, and uploading the signals to the main chip 17, so as to drive the relevant load to act.

In this way, by providing the control circuit, only when the first signal and the second signal are detected to be changed, the key structure is confirmed to be touched to adjust the processing flow of the load. When the user does not touch the key, even if the first signal changes due to environmental reasons, the second signal cannot be generated because the user does not touch the key, so that the control circuit cannot mistakenly confirm the key structure as being touched, and cannot mistakenly respond, and the touch response accuracy of the key structure is improved.

Optionally, the key structure further includes an SMT (Surface Mount Technology) resistor 14 and an SMT capacitor 15, where the SMT resistor is used for signal transmission and current limiting, and the SMT capacitor is used for filtering and resonating with the inductor 10. Wherein the selection of parameters for the SMT resistors 14 and the SMT capacitors 15 requires the selection of parameters matching the pre-processed chips 16 and the main chip 17.

The present application provides an embodiment, and fig. 7 shows a flowchart of a key structure control method provided by the present disclosure, where the key structure control method is applied to the key structure as described above, and includes:

step S100, receiving a first signal generated between an inductance coil and a conductive part, wherein the first signal changes along with the change of the distance between the inductance coil and the conductive part;

step S200, receiving a second signal generated by conducting the conductive plate and the inductance coil when the conductive part moves to a position where the conductive part is simultaneously contacted with the inductance coil and the conductive plate;

and step S300, controlling a key structure to indicate a load according to the first signal and the second signal.

In the technical scheme provided by the embodiment of the application, when the panel is pressed down without an external force, the conductive part 8 does not move, a first signal is generated between the conductive part 8 and the inductance coil 10, and the magnetic field and the inductance value generated by the inductance coil 10 are unchanged, namely the inductance value of the inductance coil and the surrounding magnetic field are stable when the key structure is not operated; when an external force presses the panel, the panel deforms, so that the conductive part 8 moves towards the direction close to the signal induction part, the conductive part 8 generates a self-generated magnetic field when moving downwards, the primary magnetic field of the inductance coil is further changed, the change of the electric field and the equivalent inductance value of the inductance coil is caused, then the first signal changes along with the change, when the conductive part 8 moves to be in contact with the printed circuit board 12, the inductance coil 10 is connected with the conductive disc 11, a second signal is generated, when the change of the first signal and the change of the second signal are detected simultaneously, the fact that the key structure is pressed is confirmed, and the load is indicated to work normally. Through the first signal and the second signal that detect the production, realize that dual signal responds to and detects to can avoid separating mistake such as empty touch and touch the problem, improve button control's reliability and user experience.

Referring to fig. 8, fig. 8 schematically illustrates a hardware detection circuit diagram of an embodiment of the present disclosure. The hardware detection circuit comprises a signal detection circuit, a touch chip processing module and a main chip processing module. The signal detection circuit is used for detecting and transmitting the signal quantity, two independent signal detections are arranged in each key area, the key structure is not deformed when no finger is operated, and the position of the conductive part is fixed, so that the magnetic field and the inductance value generated by the inductance coil are not changed. When a finger presses down, the key structure is pressed down, the position of the conductive part moves downwards until the conductive part is contacted with the PCB, a self-generated magnetic field is generated when the conductive part moves downwards, so that the primary magnetic field of the inductance coil is changed, the change of the electric field of the inductance coil and the change of the equivalent inductance value of the coil are caused, and the first signal is changed; when the conductive part moves to be in contact with the PCB, the inductance coil is connected with the conductive disc and conducted to generate a second signal. And after the signal detection circuit detects the first signal and the second signal, the double signals are converted and transmitted to the touch chip processing circuit. The touch chip processing circuit is used for comparing a frequency value corresponding to the first signal and a voltage signal corresponding to the second signal detected by the signal detection circuit with a set threshold value through internal program conversion to identify whether a key is pressed down or not, and then transmitting a processing result to the main chip processing module. And finally, the main chip processing circuit is used for controlling the display of the whole machine and the drive detection of each load, receiving the transmitted communication content and realizing the key function display and the parameter flow adjustment.

Corresponding to the circuit diagram, the signal detection circuit corresponds to three key structures of SW1, SW2 and SW3, taking one key structure SW1 as an example, three ports of TP1-1, TP1-2 and TP1-3 of SW1 correspond to pins of TP1-1, TP1-2 and TP1-3 of the touch chip processing module respectively, other key structures are correspondingly connected to other corresponding ports, and pins of SDA and SCL of the touch chip processing module correspond to pins of SDA and SCL of the main chip processing module respectively.

A washing machine comprises a plurality of key structures, for example, one key structure SW1 is taken as an example, a first signal (signal 1 for short) is generated by the principle that a preprocessing chip IC1 sends a detection signal (resonant frequency and certain amplitude) to a signal detection module inductance coil L1 through a pin 43TP1-1, the L1 and a capacitor C1 generate oscillation through a capacitor C2 and a resistor R1, and a feedback port TP1-2 detects a frequency value to identify, namely the first signal is the frequency value of the inductance coil; the second signal (signal 2 for short) is identified by pressing the button structure SW1 to contact the PCB, connecting the inductor coil with the central pad, and detecting the amplitude value of the feedback port TP1-3, i.e. the second signal is the amplitude value of the inductor coil.

When no finger is pressed: the magnetic field and inductance around the signal 1-L1 are not changed, the oscillation frequency of the feedback port TP1-2 is consistent with the set reference value X1 and is sent to the IC1, and the semaphore 1 is judged to be unchanged at the moment; signal 2-structure button does not push down, and inductance coils and center pad are not connected, and no signal gives IC1, and the judgement is that semaphore 2 does not change this moment, and IC1 uploads signal 1 and 2 to main chip IC2 after the preliminary treatment.

When the finger presses down, the structure button is pressed down: the signal 1-the metal disc moves in the magnetic field and can produce the self-generated magnetic field, and then change the magnetic field around the original inductance coil, cause L1 peripheral electric field and equivalent coil inductance value to change, make L1 and C1 oscillating frequency point offset amplitude reduce, feedback port TP1-2 detects the oscillating frequency and changes and gives IC1, the inside of IC1 turns the signal into the digital quantity to discern, compare with threshold signal quantity X1 presumed, upload to the main chip IC2 in the communication mode after meeting the decision logic; when the signal 2-metal disc moves downwards to the PCB, the inductance coil is connected with the central bonding pad, the feedback port TP1-3 recognizes the oscillation amplitude voltage to be transmitted to the IC1, the oscillation amplitude voltage is compared with the set voltage threshold signal quantity Y1, and the oscillation amplitude voltage meets the judgment logic and then is transmitted to the preprocessing main chip IC2 in a communication mode; only when the signal 1 and the signal 2 are triggered simultaneously, the main chip IC2 judges that a finger presses down to execute a corresponding function, and other conditions (the signal 1 has a signal, the signal 2 does not have or the signal 1 does not have a signal, and the signal 2 does not have) judge that no key is pressed down, so that the false touch probability can be greatly reduced.

Fig. 9 shows a detailed processing flowchart of a key structure control method according to an embodiment of the present disclosure. In this embodiment, the signal 1 refers to a frequency value of an inductance coil of the key structure, and the signal 2 refers to a voltage value of the inductance coil; x1 denotes a first reference value of the first signal X, and Y1 denotes a second reference value of the second signal Y. The key structure control method specifically comprises the following steps:

s111, initializing a preprocessing chip through enabling interruption;

s112, initializing a main chip;

s113, starting to scan a first key;

s114, collecting the signal 1 for multiple times, and filtering, calculating and converting;

s115, converting and identifying the frequency signal into a first semaphore X;

s116, judging whether X is larger than X1;

s117, collecting the signal 2 for multiple times, and filtering, calculating and converting;

s118, converting and identifying the voltage signal into a second semaphore Y;

s119, judging whether Y is larger than Y1,

s220, when X is larger than X1 and Y is larger than Y1, determining and responding to the touch of the key, and adjusting the processing flow of the load indicated by the load;

s221, otherwise, the process flow of the load indicated by the key is continuously maintained.

And after the first key scanning is finished, scanning other keys, determining whether the other keys are touched in the same method, and processing the keys correspondingly.

It should be noted that this embodiment is only an exemplary illustration of the detailed processing flow of the touch response, and should not limit the function and the scope of the disclosure.

It should be noted that although the various steps of the methods in this application are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the shown steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A key structure, comprising:

a printed wiring board;

2. The key structure according to claim 1, further comprising an elastic member mounted on the printed wiring board, the elastic member including a main body portion having a hollow area formed therein,

the hollow area comprises a first hollow area and a second hollow area, the second hollow area is positioned at one side of the first hollow area close to the printed circuit board, the conductive part is positioned in the first hollow area and attached to the inner surface of the elastic part, and the inductance coil and the conductive disc are positioned in the second hollow area.

3. The key structure according to claim 2, wherein an outline of the first hollow region is located inside an outline of the second hollow region in an orthographic projection taken in the first direction.

4. The key structure of claim 3, wherein the length of the conductive member is equal to the length of the first hollow region in a second direction, wherein the second direction is perpendicular to the first direction.

5. The key structure according to claim 4, wherein an outline of the first hollow region is located between an inner circle of the inductor and an outer circle of the inductor in an orthographic projection taken in the first direction.

6. The key structure according to claim 2, wherein an outer side wall of the main body portion is a stepped surface, and sizes of the main body portion in a second direction decrease in sequence from the second hollow region to the first hollow region, the second direction being perpendicular to the first direction.

7. The key structure according to claim 2, wherein said elastic member further comprises a fixing portion integrally connected to said main body portion, said fixing portion being fitted to said printed wiring board and fixed to said printed wiring board by a fixing member.

8. The key structure according to any one of claims 1-7, further comprising a control circuit and a panel, wherein the panel is covered on the printed circuit board, the signal induction component and the conductive component are disposed in the accommodating cavity of the panel, and the control circuit is electrically connected to the inductance coil and the conductive pad, and is configured to receive the first signal and the second signal to control the key structure to indicate a load.

9. A washing machine, characterized in that it comprises a key structure according to any one of claims 1-8.

10. A key structure control method applied to the key structure according to any one of claims 1 to 8, comprising:

receiving a second signal generated by conduction of the conductive plate and the inductance coil when the conductive part moves to a position where the conductive part is simultaneously contacted with the inductance coil and the conductive plate;