CN100447718C - Input keyboard of a digital device - Google Patents

Abstract

The invention discloses a keyboard, which includes a planar keyboard surface and a processing unit; the keyboard surface can sense information such as whether its surface is pressed and the pressing position, and output the sensing information; the processing unit receives ten Fingers press the information on the keyboard surface at the same time, use the information of ten fingers as the information of the original position, and when pressed later, determine the input key value according to the relative position of the pressed position and the original position and output it. Preferably, the keyboard surface is made of flexible and foldable material. The present invention also provides a keyboard input method, including: 181) receiving the pressing information of ten fingers on the key surface at the same time; 182) taking the pressing position information of the ten fingers simultaneously pressing the keyboard surface as the original position information, using Determine the distribution of keys on the keyboard surface and the key values corresponding to each key; 183) receive the pressing information of the finger pressing the keyboard surface; the information includes pressing position information; 184) determine the keys and key values according to the pressing position information; 185) output determination The ASCII code or other encoding of the key value.

Description

Input keyboard of a digital device

technical field

The invention relates to an input device of a digital device, in particular to a keyboard. The invention also provides an input method using the keyboard.

Background technique

Keyboard is the main input device of digital equipment such as computer at present, and keyboard has various forms at present.

The keyboard of the traditional desktop computer has the advantages of large number of keys, reasonable space distance of keys, convenient and quick input, etc., and has been widely used. However, this keyboard also has the disadvantages of being bulky and inconvenient to carry, and cannot be configured in small digital devices.

In the prior art, various other types of keyboards have also appeared to adapt to the trend of miniaturization and portability of digital devices. For example, the keyboard of a notebook computer adopts the method of key multiplexing, which reduces the number of keys compared with that of a desktop computer keyboard. In personal digital assistants and mobile phone input keyboards, the number of keys is less, and more key multiplexing measures are adopted. For example, the mobile phone keyboard adopts the mode that multiple letters share one key to adapt to the volume of the mobile phone. However, the method of multiplexing the keys increases the input time, cannot realize fast input, and also does not conform to the user's usage habits.

Contents of the invention

In view of the above-mentioned defects, the technical problem to be solved by the present invention is to provide an input keyboard of a digital device, which can be used in the traditional way of a desktop computer keyboard, and at the same time has portability, so that users can enjoy the input comfort of a desktop computer at any time . The invention also provides a method for using the numeric keyboard.

The keyboard provided by the present invention includes a planar keyboard surface and a processing unit; the keyboard surface can sense information such as whether its surface is pressed and the pressing position, and output sensing information; the processing unit receives ten fingers simultaneously Press the information on the keyboard surface, use the information of ten fingers as the information of the original position, and when it is pressed later, determine the input key value according to the relative position between the pressed position and the original position and output it; the keyboard surface includes: setting The first circuit layer at the bottom, the second circuit layer at the top, and the isolation layer between the first circuit layer and the second circuit layer; each of the above layers is made of foldable and bendable flexible material, and The layers are tightly bonded together; the first circuit layer and the second circuit layer are arranged with electrical components; in the free state, the electrical components of the first circuit layer and the electrical components of the second circuit layer are electrically connected by the isolation layer Isolation: When a certain position on the surface of the keyboard is pressed, the electrical components of the first circuit layer and the second circuit layer at this position will change the electromagnetic state due to the close distance, and the change of the electromagnetic state is the sensing information.

Preferably, the keyboard surface is made of flexible and foldable material.

Preferably, the electrical components of the first circuit layer are used to determine the pressed longitudinal position of the keyboard surface, and the electrical components of the second circuit layer are used to determine the pressed horizontal position of the keyboard surface; or the The electrical components of the first circuit layer are used to determine the pressed lateral position of the keyboard surface, and the electrical components of the second circuit layer are used to determine the pressed longitudinal position of the keyboard surface.

Preferably, the electrical components are densely distributed wires; the wires of the first circuit layer are arranged in parallel in the transverse direction, and the wires of the second circuit layer are arranged in parallel in the longitudinal direction; or the wires of the first circuit layer are arranged in parallel in the longitudinal direction, and the wires of the second circuit layer The conductive wires are horizontally arranged in parallel; the above-mentioned conductive wires are all connected to the processing unit; there are a number of uniformly distributed nodes on the conductive wires, and the nodes of the first circuit layer and the nodes of the second circuit layer are opposite to each other in spatial position; The isolation layer has a number of regularly arranged through holes, and the positions of the through holes correspond to the positions of the nodes; the change of the electromagnetic state is that the wires of the first circuit layer and the wires of the second circuit layer change from non-conduction to conduction.

Preferably, after the processing unit receives the sensing information, it determines the longitudinal coordinates and horizontal coordinates of the pressing position respectively according to the wires of the first circuit layer and the wires of the second circuit layer where the electromagnetic state changes, or determines the pressing position respectively. The horizontal coordinates and vertical coordinates of the position; the above coordinates are the pressing position information.

Preferably, the electrical component is an electrode plate; when the keyboard surface is pressed, the electrode plate of the first circuit layer is close to the electrode plate of the second circuit layer so that the capacitance value of the pressed position changes, and the electromagnetic state The change of is the change of the capacitance value.

Preferably, the processing unit includes a scanning unit, a detection unit, a signal integration unit, and a decoding unit; the scanning unit provides scanning signals to the first circuit layer and/or the second circuit layer of the keyboard surface, and sends the The scanning state information is output to the signal integration unit; the detection unit is used to receive the sensing information generated by the scanning signal on the keyboard surface and transmit it to the signal integration unit; the signal integration unit integrates the scanning The status information and the sensing information determine whether a pressing signal and the position information contained in the pressing signal appear, and determine the key according to the position information; the decoding unit is used to receive the key information output by the signal integration unit, and It is converted into the corresponding key value, and forms the key value code output.

Preferably, the scanning unit includes a horizontal scanning unit and a vertical scanning unit, which are respectively used to provide scanning signals to electrical components arranged horizontally and vertically; meanwhile, the detection unit is divided into a horizontal detection unit and a vertical detection unit, which are respectively used for Sensing signals generated by electrical components arranged horizontally and vertically are received.

Preferably, the position of each key is marked on the keyboard, and the user needs to input a certain key value by pressing the position marked with the key value.

Preferably, there is a control key area on the keyboard, and the keys in the control key area have fixed meanings, and the user can switch the working state of the keyboard or complete specific keyboard functions by controlling the keys in the key area.

The working state of the keyboard refers to the keyboard input state or the keyboard position initialization state; when in the keyboard position initialization state, the processing unit receives the sensing information of ten fingers as key positioning information; when in the keyboard input state, Then the keyboard input is received normally.

Preferably, the position distribution of the keys may be the same as that of the standard keys, or any key arrangement customized by the user may be adopted.

Preferably, the processing unit is integrated with the keyboard surface; or the processing unit is separated from the keyboard surface and connected through a cable.

Preferably, there is a protective layer on the outside of the keyboard.

Preferably, the processing unit outputs the key value in ASCII code form or other encoding form.

Preferably, when the pressed information on the keyboard surface received by the processing unit indicates that the pressed position includes several keys, the processing unit selects the key value corresponding to the key in the middle node of the pressed position to output.

The present invention simultaneously provides a kind of keyboard input method, comprises steps:

181) receiving the pressing information of ten fingers on the key surface at the same time;

182) According to the pressing position information of the ten fingers pressing the keyboard surface at the same time as the original position information, to determine the key distribution on the keyboard surface and the key value corresponding to each key;

183) receiving the pressing information of the finger pressing the keyboard surface; the information includes the information of the pressing position;

184) Determine the button and the button value according to the information of the pressed position;

185) Output the ASCII code or other codes of the determined key value.

Preferably, when determining the distribution of keys on the surface of the keyboard in the step 182), the natural bending of the user's fingers and the thickness of the fingers are taken into consideration.

The keyboard provided by the invention is made of flexible materials, and because of its light and thin volume, and the ability to be rolled and folded conveniently, the keyboard has good portability. At the same time, the keyboard has the same area as the desktop computer, which makes the layout of the keyboard more convenient without changing the user's input habits.

The preferred embodiment of the present invention can also enable the user to determine the corresponding relationship between the pressed position on the keyboard surface and the key value according to his own intention, which provides greater convenience for the user.

At the same time, the present invention also proposes an input method, which is characterized by first determining the original position of the user's hand, and then determining the distribution position of the keys on this basis, so that the use of the keyboard is more flexible.

Description of drawings

Fig. 1 is the exterior view of the first embodiment of the present invention;

Fig. 2 is an example of the position of the surface of the keyboard surface and the corresponding method of the keys according to the first embodiment of the present invention;

Fig. 3 is a schematic diagram of the folded state of the first embodiment of the present invention;

Fig. 4 is the composition structure of the keyboard surface of the first embodiment of the present invention;

5 is a schematic diagram of wire distribution on the first circuit layer of the keyboard surface according to the first embodiment of the present invention;

Fig. 6 is a schematic diagram of wire distribution on the second circuit layer of the keyboard surface according to the first embodiment of the present invention;

Fig. 7 is an internal block diagram of the processing unit of the first embodiment of the present invention;

Fig. 8 is the working flowchart of the first embodiment of the present invention;

Fig. 9 is a block diagram of a second embodiment of the present invention.

Detailed ways

Please refer to FIG. 1 , which is an appearance diagram of the first embodiment of the present invention.

The keyboard provided in this embodiment includes a planar keyboard surface and a processing unit.

As shown in FIG. 1 , the keyboard surface is a plane, and no keys are arranged on the surface. Electrical components are distributed on the keyboard surface, which can be used to sense information such as whether the keyboard surface is pressed and the pressed position, and output the above sensing information. The figure shows that ten fingers of the operator press the keyboard surface simultaneously.

The processing unit (not shown in the figure) can be integrated with the keyboard surface, for example, located on one side or in the plane of the keyboard surface, or can be separated from the keyboard surface and only connected by a cable. The processing unit receives the sensing information of the keyboard surface, and determines and outputs the key value according to the pressing position information therein.

FIG. 2 illustrates an example of how the pressed position on the keyboard surface corresponds to the key value. Fig. 2 is corresponding to Fig. 1, shows in the figure that the keyboard surface senses ten fingers in Fig. 1 and presses the information of the keyboard surface and the pressing position at the same time, and determines the above position as the initial key position "ASDFJKL;" and the space bar; Other key positions can be further determined according to the initial key position determined above and according to the key distribution of the common keyboard. It can be seen from the figure that, unlike the normal keyboard key distribution, the key distribution of this keyboard can determine the position of the key according to the natural bending degree of the finger, which is more in line with the requirements of ergonomics.

Please refer to FIG. 3 , which is a schematic diagram of the folded state of the keyboard. The keyboard described in the figure is folded in three. This is because the keyboard surface of the keyboard is flat and made of thin, flexible and foldable materials. The flexible material can be folded and rolled for easy portability. Therefore, this kind of keyboard has the incomparable convenience of ordinary keyboards.

Fig. 4 shows the composition structure of the keyboard surface of the keyboard.

The figure shows that the keyboard surface of the keyboard includes three layers, which are respectively from bottom to top: a first circuit layer 1 , an isolation layer 2 , and a second circuit layer 3 . The above three layers are tightly bonded together.

Please refer to FIG. 5 , which shows a schematic diagram of wire distribution of the first circuit layer 1 . The figure also shows the processing unit 4 located at one end of the keyboard surface. The figure shows that the surface of the first circuit layer 1 is densely distributed with wires distributed in parallel in the transverse direction. In order to achieve a better sensing effect, several nodes 5 with relatively large areas are regularly arranged at a certain distance on the wires. The transversely parallel distributed wires can be used to detect the longitudinal position of the pressed point.

Please refer to FIG. 6 , which shows that the surface of the second circuit layer is densely distributed with longitudinally parallel wires. In order to achieve a better sensing effect, several nodes 6 with larger areas are regularly arranged on the wires. The number of the nodes 6 is the same as that of the nodes 5 of the first circuit layer, and the spatial positions overlap one by one. The above wires are all connected to the processing unit 4 . The longitudinally distributed wires can detect the lateral position of the pressed point.

The arrangement of the wires in the above-mentioned first circuit layer 1 and the second circuit layer 3 can also be that the first circuit layer 1 arranges the wires distributed in parallel in the longitudinal direction, and at the same time, the second circuit layer 3 arranges the wires distributed in parallel in the transverse direction. At this time, the first circuit layer The meanings of the position information obtained by detecting the layer 1 and the second circuit layer 3 are also opposite.

Please continue to refer to Figure 4. As shown in the figure, there is an isolation layer 2 between the first circuit layer 1 and the second circuit layer 3 . The isolation layer 2 is an insulating film, and has through holes at positions corresponding to the nodes 5 and 6 on the first circuit layer 1 and the second circuit layer 2 .

The first circuit layer 1, the isolation layer 2 and the second circuit layer 3 are all made of light and thin flexible materials, and the three layers are tightly bonded.

When the keyboard surface is in a free state, due to the effect of the isolation layer 2, the wires on the first circuit layer 1 and the second circuit layer 2 are insulated from each other.

When the keyboard surface is pressed, since the isolation layer 2 has a through hole, under the action of pressure, the node 5 of the first circuit layer 1 at this position and the node 6 of the corresponding second circuit layer 3 pass through the isolation layer 2 The vias at this location make contact and conduct. By detecting the above-mentioned changes in the electrical state, the information of the pressed keyboard surface and the pressed position can be obtained.

In the following, in conjunction with the introduction of the processing unit 4 , it will be described how the above-mentioned keyboard surface is pressed and the information of the pressed position is detected.

Please refer to FIG. 7 , which shows a block diagram of the processing unit.

The processing unit 4 has a scanning unit 41 , a detection unit 42 , a signal synthesis unit 43 , and a decoding unit 44 .

The scanning unit 41 of the processing unit 4 generates a +12V voltage as a scanning signal, and supplies the +12V voltage to the conductive wires distributed in parallel in the first circuit layer 1 in sequence. The scanning unit 41 simultaneously provides scanning state information to the signal integration unit 43, the scanning state information including the wire number information of the wire being scanned.

The detection unit 42 detects whether the wires distributed in parallel in the longitudinal direction of the second circuit layer 3 have a +12V detection signal voltage output while the scanning unit 41 is scanning. If it is detected that a certain wire has a +12V voltage output, then It can be judged that the keyboard surface is pressed. The detection unit 42 obtains the wire number of the output +12V voltage and outputs it.

The signal integration unit 43 receives the scanning wire number information provided by the scanning unit 41, and the wire number information provided by the detection unit 42 that detects the +12V voltage output, synthesizes the above information to determine the current pressing position, and then A specific key is determined according to the pressed position.

For example, when the scanning unit 41 scans that the fifth wire of the first circuit layer 1 is supplied with +12V voltage, at the same time, the detection unit 42 detects that the ninth wire of the second circuit layer 3 has a +12V voltage output, It indicates that the common node position of the 5th wire of the first circuit layer 1 and the 9th wire of the second circuit layer 3 is pressed. According to the above information, the signal integration unit 43 determines that the pressing position is at the intersection of the fifth wire of the first circuit layer 1 and the ninth wire of the second circuit layer 3, therefore, the pressing position is determined, and according to The pressed position further determines the corresponding key. Since the position of a key is not in one-to-one correspondence with the crossing nodes of the wires, but each key has multiple crossing nodes, it is necessary to further determine the corresponding key according to the pressed position determined by the wire nodes. The determined key is only a certain key in the physical sense, and does not represent any input information.

The decoding unit 44 receives the key determined by the signal integration unit 43, and converts the key into an ASCII code of the corresponding key value or outputs a code value in other forms. The information represented by each key of the keyboard, that is, the key value can be set by the user through software according to his own needs, and the decoding unit 44 determines the key value according to the determined key, and then converts the key value into a corresponding ASCII code output , so that the digital device can receive it. Of course, the key value can also be output in coded form other than ASCII code.

Since the above-mentioned parallel wires are very densely arranged, the position accuracy that can be detected is much higher than the need to determine the position of a certain key. For example, there may be 8 nodes distributed in the position of key "A", as long as any one of them is detected The pressed state can determine the pressed key, and then determine the key value "A" according to the key. When it is detected that several adjacent nodes are pressed at the same time, the pressed key is determined according to the node in the middle position. When the keyboard surface pressed information received by the processing unit indicates that the pressed position is at the junction of several keys, it is processed as a meaningless signal.

Through the above process, the processing unit 4 obtains the determined ASCII code value according to the pressing information on the key surface, and outputs it to the host computer of the digital device through an output cable or in a wireless manner.

The above-mentioned method of detecting the continuity of the wire is only a solution to realize the detection of the pressing position on the keyboard surface. Other methods can also be used to realize the detection of the pressing position of the keyboard surface. For example, a capacitance detection method is used. At this time, electrode plates are densely distributed in the first circuit layer 1 and the second circuit layer 3 , and the isolation layer 2 is a paper medium or other suitable capacitor medium. The pressing position is detected by using the effect on the capacitance change before and after pressing.

In addition to the above detection methods, other detection methods can also be used to detect the pressing position, and various detection methods can obtain inspiration from the prior art.

Both the front and back sides of the keyboard surface in the present invention can be used to realize input.

In order to protect the above-mentioned circuit layer and isolation layer, a special protective layer can be provided outside the keyboard surface.

Various methods may be used to determine each key on the keyboard and the corresponding key value. For example, the position of each key and its key value can be represented in a drawing on the keyboard surface.

However, in order to maximize the convenience of use, taking the arrangement of keys on a general-purpose keyboard as an example, the following methods may be used to determine the keys on the keyboard and their values. When the user presses ten fingers on the surface of the keyboard as shown in FIG. 1 , the processing unit obtains the position of each finger, and initializes the keyboard position according to the position. For example, determine the positions of the ten fingers as corresponding to "ASDFJKL:" and the space, and then calculate the relative positions of other keys according to the key distribution of the ordinary keyboard combined with the number of nodes occupied by the area pressed by the fingers, and finally determine the position of each key. The key corresponding to the position, and the key value of each key is determined according to the key arrangement mode of the ordinary keyboard. This solution enables the user to maintain the habit of using an ordinary keyboard when using the keyboard, and at the same time has considerable convenience. Compared with ordinary buttons, since the initial button position can be determined according to the natural bending of the human hand, and the area of each button can be determined according to the natural conditions such as the thickness of the human finger, it is more comfortable to use.

If the above method is not used, a special switch can also be set, through which the user can switch between the keyboard input state and the keyboard position initialization state; when in the keyboard position initialization state, the processing unit receives the sensing information of ten fingers, As key positioning information; when in the keyboard input state, the keyboard input is normally accepted.

Please refer to FIG. 8 , which shows the input method steps of the keyboard when the above-mentioned ten-finger pressing is used to initialize the key position.

Step S81 , detecting the information of the pressing and the pressing position.

Step S82, judging whether the keyboard surface is pressed, and the pressing time reaches the set time T. If yes, go to step S83; if not, go back to step S81.

The setting time T is to determine that the pressing is a conscious input rather than an unconscious touch.

Step S83, judging whether ten fingers are pressing simultaneously. If yes, go to step S84; if not, go to step S85.

The judging whether ten fingers are pressing at the same time is specifically detecting whether there are ten mutually separated pressing positions at the same time, and whether the above positions conform to the characteristics of natural placement of ten fingers.

Step S84, perform initialization. The initialization includes: using the above ten positions as positioning keys respectively, and determining the key values of the positioning keys according to the user's customization; distribution position, and according to the user's customization, determine the key value of these keys. After the initialization is completed, return to step S81.

The customization by the user means that the user determines the key value of each key according to the user's needs, that is, the input signal represented by each key. In this embodiment, the user can define the information represented by each key on the keyboard through software, that is, determine the value of the key.

Step S85, the processing unit looks up a table according to the pressing position. The key corresponding to the pressed position and the key value are recorded in the truth table of the processing unit, and the processing unit determines the value of the corresponding key by querying the truth table.

Step S86, judging whether the pressed position corresponds to a valid key. If yes, go to step S87; if not, go back to step S81.

Since not all positions correspond to certain keys, and some pressed positions and combinations of pressed positions are not recorded in the truth table, the key value cannot be obtained by querying the truth table at this time, and such pressed information should be regarded as meaningless information, will not be processed.

Step S87, outputting the ASCII code of the key value obtained from the query to complete a keyboard input. Then return to step S81.

Please refer to FIG. 9, which shows a structural diagram of the second embodiment of the present invention.

The second embodiment is similar to the first embodiment in structure and function, and only the different parts will be described below.

FIG. 9 shows that the keyboard includes a keyboard surface 91 and a processing unit 92 . The structure of the keyboard surface 91 is basically the same as that of the keyboard surface of the first embodiment. The difference is that there is a control button area 911 in the lower right corner of the keyboard surface 91, and several fixed keys are defined in this area, and these keys cannot be customized by the user. By using these keys, the keyboard can be switched between the initialization state or the input state, and other specific keyboard function switching or other specific keyboard functions can be completed.

The processing unit 92 is not integrated with the keyboard surface 91 , but is separated from the keyboard surface and connected to the keyboard surface through cables 93 and 94 . The processing unit 92 can be integrated in the host computer of the digital device, which can further reduce the volume and weight of the keyboard.

As shown in FIG. 9 , the processing unit 92 is connected to the keyboard surface 91 through a cable 93 and a cable 94 . The cable 93 is used to connect the horizontal input and output wires of the keyboard, and the cable 94 is used to connect the vertical input and output wires of the keyboard.

Corresponding to the above connection method, the keyboard adopts the following method to realize the detection of the pressed position. Referring to FIG. 10 , the processing unit 92 performs horizontal position scanning and detection signal reception through the horizontal scanning detection unit 921 through the cable 93, and performs vertical position scanning and detection signal reception through the vertical scanning detection unit 922 through the cable 94. information, the detection signals obtained by the above-mentioned horizontal scanning detection unit 921 and the vertical scanning detection unit 922 are transmitted to the signal synthesis unit 923, and the pressing position can be judged from the above two signals comprehensively, and then the button can be judged; the button information is sent to the decoding unit 924. Generate corresponding key values and output corresponding ASCII codes.

In this embodiment, the specifically determined keys of the control key area 911 are used to switch between the key input state and the initialization state, and judge the meaning of the input press information according to the state and perform corresponding processing.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (16)

1. A keyboard, characterized in that it comprises a planar keyboard surface and a processing unit; the keyboard surface can sense whether its surface is pressed and press position information, and output sensing information; the processing unit receives ten The information on the keyboard surface is pressed by four fingers at the same time, and the information on the ten fingers is used as the original position information, and when pressed later, the input key value is determined and output according to the relative position between the pressed position and the original position; Wherein, the keyboard surface includes: The first circuit layer placed at the bottom; placed on the uppermost second circuit layer; an isolation layer placed between the first circuit layer and the second circuit layer; The arrangement of the first circuit layer and the second circuit layer also includes an electrical component; in the free state, the electrical component of the first circuit layer and the electrical component of the second circuit layer are electrically isolated by the isolation layer; when the keyboard surface When a certain position is pressed, the electrical components of the first circuit layer and the second circuit layer at this position will change their electromagnetic state due to the close distance, and the change of electromagnetic state is the sensing information. 2. The keyboard according to claim 1, characterized in that, the keyboard surface and the above-mentioned layers can be made of flexible and foldable materials. 3. The keyboard according to claim 1, wherein the electrical components of the first circuit layer are used to determine the longitudinal position where the keyboard surface is pressed, and the electrical components of the second circuit layer are used to determine the The lateral position of the keyboard surface being pressed; or the electrical components of the first circuit layer are used to determine the lateral position of the keyboard surface being pressed, and the electrical components of the second circuit layer are used to determine the pressed position of the keyboard surface portrait position. 4. The keyboard according to claim 3, wherein the electrical components are densely distributed wires; the wires of the first circuit layer are arranged in parallel horizontally, and the wires of the second circuit layer are arranged in parallel vertically; or the first circuit layer The wires of the second circuit layer are arranged in parallel vertically, and the wires of the second circuit layer are arranged in parallel horizontally; the above-mentioned wires are all connected to the processing unit; there are a number of uniformly distributed nodes on the wires, and the nodes of the first circuit layer are connected to the second circuit layer. The nodes of the circuit layer are relatively one by one in spatial position; the isolation layer has a number of regularly arranged through holes, and the positions of the through holes correspond to the positions of the nodes; the change of the electromagnetic state is that the wires of the first circuit layer and the The wires of the second circuit layer change from non-conduction to conduction. 5. The keyboard according to claim 4, characterized in that, after receiving the sensing information, the processing unit determines the pressing force according to the wires of the first circuit layer and the wires of the second circuit layer where the electromagnetic state changes occur. The vertical coordinates and the horizontal coordinates of the position, or the horizontal coordinates and the vertical coordinates of the pressing position are respectively determined; the above coordinates are the pressing position information. 6. The keyboard according to claim 1, wherein the electrical element is an electrode plate; when the keyboard surface is pressed, the electrode plate of the first circuit layer is close to the electrode plate of the second circuit layer to make the electrode plate The capacitance value of the pressed position changes, and the change of the electromagnetic state is the change of the capacitance value. 7. The keyboard according to claims 1 to 6, wherein the processing unit includes a scanning unit, a detection unit, a signal synthesis unit, and a decoding unit; And/or the second circuit layer provides the scan signal, and outputs the scan status information to the signal integration unit; the detection unit is used to receive the sensing information generated by the scan signal on the keyboard surface and transmit it to the The signal integration unit; the signal integration unit integrates the scanning state information and the sensing information, determines whether there is a pressing signal and the position information contained in the pressing signal, and determines the button according to the position information; the decoding unit It is used to receive the key information output by the signal integration unit, convert it into corresponding key value, and form the key value code for output. 8. The keyboard according to claim 7, wherein the scanning unit comprises a horizontal scanning unit and a vertical scanning unit, which are respectively used to provide scanning signals to electrical components arranged horizontally and vertically; meanwhile, the detection unit is divided into The horizontal detection unit and the vertical detection unit are respectively used for receiving sensing signals generated by electrical components arranged horizontally and vertically. 9. The keyboard according to any one of claims 1 to 6, characterized in that the positions of the keys are marked on the surface of the keyboard, and the user needs to input a certain key value by pressing the position marked with the key value. 10. The keyboard according to any one of claims 1 to 6, characterized in that there is a control key area on the keyboard surface, the keys in the control key area have fixed meanings, and the user can switch the keyboard by controlling the keys in the key area working status or complete specific keyboard functions. 11. The keyboard according to claim 10, wherein the working state of the keyboard refers to the keyboard input state or the keyboard position initialization state; when it is in the keyboard position initialization state, the processing unit receives the sensing information of ten fingers , as key positioning information; when in the keyboard input state, the keyboard input is normally received. 12. The keyboard according to any one of claims 1 to 6, wherein the position distribution of the keys can be the same as the standard key position, or any key arrangement customized by the user can be adopted. 13. The keyboard according to any one of claims 1 to 6, wherein the processing unit is integrated with the keyboard surface; or the processing unit is separated from the keyboard surface and connected by a cable. 14. The keyboard according to any one of claims 1 to 6, characterized in that there is a protective layer on the outside of the keyboard. 15. The keyboard according to claim 1, wherein the processing unit outputs the key value in ASCII code form or other encoding form. 16. The keyboard according to claim 1, characterized in that, when the pressed information on the keyboard surface received by the processing unit indicates that the pressed position includes several keys, then select the key corresponding to the middle node at the pressed position. Key value output.

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