Electromagnetic handwriting antenna system, electromagnetic capacitive handwriting antenna system and handwriting equipment

Abstract

The utility model provides an electromagnetic handwriting antenna system, an electromagnetic capacitance handwriting antenna system and a handwriting device. The electromagnetic handwriting antenna system includes an induction unit, and the induction unit includes a antenna, b electromagnetic analog channels and at least a*b first analog switches. The a antennas are arranged in a queue, and each antenna includes a first end and a second end relative to each other, and the second end is connected to a common end. Each first end is electrically connected to b electromagnetic analog channels through the first analog switch, and the electromagnetic analog channels are used to transmit electromagnetic signals, wherein a≥2, b≥2, and a and b are integers. The electromagnetic handwriting antenna system of the utility model sets the electromagnetic analog channel and the first analog switch to cooperate. By selecting the first analog switch, the two antennas can form a closed loop antenna, so that the antenna can use a single antenna, and the single antenna has simple wiring, simple manufacturing, and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of handwriting devices, in particular to an electromagnetic handwriting antenna system, an electromagnetic capacitance handwriting antenna system and a handwriting device. Background Art

[0002] Electromagnetic sensing technology has the characteristics of high resolution and not being easily affected by the outside world. It is currently being used more and more widely, and is widely used in various fields such as drawing boards, drawing screens, and embedded products.

[0003] In the existing electromagnetic handwriting device, when an electromagnetic pen with a resonant circuit is moved on the antenna board of the electromagnetic board, the electromagnetic wave sent from the transmitting coil of the antenna board excites the resonant circuit of the electromagnetic pen, so that the electromagnetic pen returns an electromagnetic signal to the antenna board. The antenna board uses a ring coil as an antenna to send or receive electromagnetic signals. The ring antennas of the existing electromagnetic handwriting device are nested and arranged with a predetermined width, such as Figure 1 As shown, the wiring is complicated and the manufacturing is inconvenient. Utility Model Content

[0004] In order to solve the technical problems of complex antenna wiring and inconvenient manufacturing of the electromagnetic handwriting device, the utility model provides an electromagnetic handwriting antenna system, an electromagnetic capacitance handwriting antenna system and a handwriting device.

[0005] An electromagnetic handwriting antenna system comprises an induction unit, wherein the induction unit comprises a antennas, b electromagnetic simulation channels and at least a*b first simulation switches, wherein the a antennas are arranged in a queue, each of the antennas comprises a first end and a second end opposite to each other, the second end is connected to a common end, each of the first ends is electrically connected to b electromagnetic simulation channels respectively through the first analog switch, and the electromagnetic simulation channels are used to transmit electromagnetic signals, wherein a≥2, b≥2, and a and b are integers.

[0006] Preferably, the sensing unit comprises a first sensing unit and a second sensing unit, the antenna of the first sensing unit is arranged along a first direction, the antenna of the second sensing unit is arranged along a second direction, and an angle between the first direction and the second direction is non-zero.

[0007] Preferably, the antenna is in a strip shape, and among the b electromagnetic simulation channels, at least one electromagnetic simulation channel is used for grounding, and at least one electromagnetic simulation channel is used for connecting to a signal receiving module.

[0008] An electromagnetic handwriting device comprises a shell, a handwriting antenna board and an electromagnetic handwriting control module, wherein the handwriting antenna board and the electromagnetic handwriting control module are accommodated in the shell, the handwriting antenna board comprises an electromagnetic handwriting antenna system, the electromagnetic handwriting antenna system is electrically connected to the electromagnetic handwriting control module, the electromagnetic handwriting antenna system comprises an induction unit, the induction unit comprises a antennas, b electromagnetic simulation channels and at least a*b first simulation switches, the a antennas are arranged in a queue, each of the antennas comprises a first end and a second end opposite to each other, the second end is connected to a common end, each of the first ends is electrically connected to b electromagnetic simulation channels respectively through the first analog switch, and the electromagnetic simulation channels are used to transmit electromagnetic signals, wherein a≥2, b≥2, and a and b are integers.

[0009] An electromagnetic capacitance handwriting antenna system comprises a sensing unit, wherein the sensing unit comprises a antennas, b electromagnetic simulation channels, at least a*b first electromagnetic simulation switches, c capacitance simulation channels and at least a*c second simulation switches, wherein the a antennas are arranged in a queue, each of the antennas comprises a first end and a second end opposite to each other, each of the first ends is electrically connected to b electromagnetic simulation channels respectively through the first analog switch, and the electromagnetic simulation channels are used to transmit electromagnetic signals, each of the second ends is electrically connected to c capacitance simulation channels respectively through the second analog switch, and the capacitance simulation channels are used to transmit capacitance signals, wherein a≥2, b≥2, c≥1, and a, b, and c are integers.

[0010] Preferably, the number of the antennas a≥4, the number of the electromagnetic simulation channels b≥4, and the number of the capacitive simulation channels c≥2.

[0011] Preferably, it further comprises a first main switch, and each of the electromagnetic simulation channels is connected to the first analog switch via the first main switch.

[0012] Preferably, it also includes a second main switch, each of the capacitance simulation channels is electrically connected to the second analog switch through the second main switch, and the second main switch is used to disconnect the second main switch connected to the target capacitance channel when the electromagnetic capacitance handwriting antenna system is in the electromagnetic handwriting mode, the first end of the target antenna is connected to the target electromagnetic channel, and the second end of the target antenna connected to the target capacitance channel is connected to each other, wherein the target antenna is any two antennas among the antennas, the target electromagnetic channel is two electromagnetic simulation channels among the electromagnetic simulation channels, one is grounded, and the other is connected to the signal receiving module, and the target capacitance channel is any one of the capacitance simulation channels.

[0013] Preferably, the number of the sensing units is two, namely a first sensing unit and a second sensing unit, the antenna of the first sensing unit is arranged along a first direction, the antenna of the second sensing unit is arranged along a second direction, and the angle between the first direction and the second direction is non-zero.

[0014] Preferably, the antenna is in a strip shape, and among the b electromagnetic simulation channels, at least one electromagnetic simulation channel is used for grounding, and at least one electromagnetic simulation channel is used for connecting to a signal receiving module.

[0015] An electromagnetic capacitance handwriting device comprises a shell, a handwriting antenna board, an electromagnetic handwriting control module and a capacitive handwriting control module, wherein the handwriting antenna board, the electromagnetic handwriting control module and the capacitive handwriting control module are accommodated in the shell, characterized in that the handwriting antenna board comprises an electromagnetic capacitance handwriting antenna system, the electromagnetic capacitance handwriting antenna system is electrically connected to the electromagnetic handwriting control module and the capacitive handwriting control module, the electromagnetic capacitance handwriting antenna system comprises a sensing unit, the sensing unit comprises a antenna, b electromagnetic simulation channels, at least a*b first electromagnetic simulation switches, c capacitance simulation channels and at least a*c second simulation switches, the a antennas are arranged in a queue, each of the antennas comprises a first end and a second end opposite to each other, each of the first ends is electrically connected to b electromagnetic simulation channels respectively through the first analog switch, the electromagnetic simulation channel is used to transmit electromagnetic signals, each of the second ends is electrically connected to c capacitance simulation channels respectively through the second analog switch, the capacitance simulation channel is used to transmit capacitance signals, wherein a≥2, b≥2, c≥1, and a, b, c are integers.

[0016] Compared with the prior art, the electromagnetic handwriting antenna system provided by the utility model sets the electromagnetic analog channel and the first analog switch to cooperate, so that the antenna can adopt a single antenna, the second end of the antenna is connected to the common end, and the first end is electrically connected to the electromagnetic analog channel through the first analog switch. By selecting the first analog switch, the two antennas can form a closed loop antenna to realize the function of transmitting and receiving signals. The single antenna has simple wiring, simple manufacturing and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the arrangement of a loop antenna of an existing electromagnetic handwriting device in the prior art;

[0018] Figure 2 A schematic diagram of the connection of the induction unit of the electromagnetic handwriting antenna system provided in the first embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the connection between the antenna shown in Figure 2 and the first analog switch;

[0020] Figure 4 This is a schematic diagram of the connection of the induction unit of the electromagnetic capacitance handwriting antenna system provided in the second embodiment of the utility model. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the present invention, "at least one" means one or more, and "more" means two or more. The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0023] First embodiment

[0024] See also Figure 2 and Figure 3 ,in, Figure 2 This is a schematic diagram of the connection of the induction unit of the electromagnetic handwriting antenna system provided in the first embodiment of the utility model. Figure 3 2 is a schematic diagram of the connection between the antenna and the first analog switch. The first embodiment of the utility model provides an electromagnetic handwriting device, which can be an electromagnetic handwriting board or an electromagnetic handwriting screen, including a housing, a handwriting antenna board, an electromagnetic handwriting control module and a handwriting pen. The handwriting antenna board and the electromagnetic handwriting control module are accommodated in the housing, and the handwriting pen is used to write on the handwriting antenna board. The handwriting antenna board includes an electromagnetic handwriting antenna system 20, and the electromagnetic handwriting antenna system 20 is electrically connected to the electromagnetic handwriting control module.

[0025] The electromagnetic handwriting antenna system 20 includes a sensing unit. When the stylus writes on the handwriting antenna board, the sensing unit senses the writing signal of the stylus to confirm the writing coordinates of the stylus. The sensing unit includes an antenna 21, an electromagnetic simulation channel 23 and a first analog switch 25. The antennas 21 are strip-shaped, the number is a, and they are arranged in a queue, a≥2, and a is an integer. Each of the antennas 21 includes a first end 211 and a second end 212 opposite to each other, and the second end 212 is connected to a common end. The number of the electromagnetic simulation channels 23 is b, and they are arranged in a queue, b≥2, and b is an integer. The number of the first analog switches 25 is at least a*b, and each of the first ends 211 is electrically connected to b electromagnetic simulation channels 23 through the first analog switch 25, and the electromagnetic simulation channel 23 is used to transmit electromagnetic signals.

[0026] In this embodiment, for every two adjacent electromagnetic simulation channels 23, one electromagnetic simulation channel 23 is used for grounding, and the other electromagnetic simulation channel 23 is used for connecting to a signal receiving module. The signal receiving module may specifically include a signal amplifier and a filter. In other embodiments, only at least one of the electromagnetic simulation channels a needs to be grounded, and at least one needs to be connected to a signal amplifier, so as to form a closed loop antenna with the two antennas.

[0027] The sensing unit includes a first sensing unit and a second sensing unit. The antenna 21 of the first sensing unit is arranged along a first direction, and the antenna 21 of the second sensing unit is arranged along a second direction. The angle between the first direction and the second direction is non-zero. The first sensing unit senses the coordinates of the stylus in the first direction, and the second sensing unit senses the coordinates of the stylus in the second direction, thereby confirming the two-dimensional coordinates of the stylus. Preferably, the first direction and the second direction are perpendicular to each other.

[0028] It can be understood that the number of antennas and the number of electromagnetic simulation channels of the first sensing unit and the second sensing unit can be the same or different, and those skilled in the art can set them according to actual needs.

[0029] When the sensing unit is working, by turning on the first analog switch 25 to connect the first end 211 of the target antenna to the target electromagnetic channel, a closed loop antenna can be formed to sense the coordinates of the stylus, wherein the target antenna is any two antennas in the antenna 21, and the target electromagnetic channel is two electromagnetic analog channels in the electromagnetic analog channel 23, one of which is grounded and the other is connected to a signal receiving module.

[0030] Here, the working principle of the electromagnetic handwriting antenna system 20 is explained by taking the first sensing unit as an example. Figure 2, set a=10, the first ends 211 of the 10 antennas 21 are antenna ends T0~T9 respectively, b=8, the 8 electromagnetic simulation channels 23 are electromagnetic simulation channels A0~A7 respectively, electromagnetic simulation channels A0, A2, A4 and A6 are grounded, electromagnetic simulation channels A1, A3, A5 and A7 are used to transmit electromagnetic signals to the electromagnetic control module, and the number of the first analog switches 25 is 10*8. If it is necessary to form a T0-T1 antenna loop, the first analog switch A1T0 can be selected to connect the antenna end T0 and the electromagnetic simulation channel A1, and the first analog switch A0T1 can be selected to connect the antenna end T1 and the electromagnetic simulation channel A0, and the two antennas 21 can form a closed loop antenna, transmit and receive electromagnetic signals, and sense the stylus writing on the T0-T1 antenna.

[0031] It is understandable that the antenna end T0 and the antenna end T1 can also select other electromagnetic simulation channels 23 to be turned on to form an antenna loop. Of course, it is also possible to select spaced antennas to form an antenna loop, such as a T3-T6 antenna loop, a T4-T7 antenna loop, and a T5-T8 antenna loop. It can be seen that because b=8, up to four antenna loops can be formed at the same time to improve the induction efficiency, and the T0-T3 antenna loop, the T1-T4 antenna loop, the T2-T5 antenna loop, and the T6-T9 antenna loop are used as examples:

[0032] The T0-T3 antenna loop selects the first analog switch A7T0 to connect the antenna terminal T0 with the electromagnetic analog channel A7; selects the first analog switch A4T3 to connect the antenna terminal T3 with the electromagnetic analog channel A4.

[0033] The T1-T4 antenna loop selects the first analog switch A6T1 to connect the antenna terminal T1 with the electromagnetic analog channel A6; selects the first analog switch A3T4 to connect the antenna terminal T4 with the electromagnetic analog channel A3,

[0034] The T2-T5 antenna loop selects the first analog switch A5T2 to connect the antenna terminal T2 with the electromagnetic analog channel A5; selects the first analog switch A2T5 to connect the antenna terminal T5 with the electromagnetic analog channel A2,

[0035] The T6-T9 antenna loop selects the first analog switch A1T6 to connect the antenna terminal T6 with the electromagnetic analog channel A1; and selects the first analog switch A0T9 to connect the antenna terminal T9 with the electromagnetic analog channel A0.

[0036] Compared with the prior art, the electromagnetic handwriting antenna system 20 provided by the utility model sets the electromagnetic analog channel 23 and the first electromagnetic analog switch 25 to cooperate, so that the antenna 21 can adopt a single antenna, the second end 212 is connected to the common end, and the first end 211 is electrically connected to the electromagnetic analog channel 23 through the first analog switch 25. By selecting the first analog switch, the two antennas 31 can form a closed loop antenna to realize the function of transmitting and receiving signals. The single antenna has simple wiring, simple manufacturing and low cost.

[0037] Embodiment 2

[0038] See also Figure 4 , which is a connection diagram of the induction unit of the electromagnetic capacitance handwriting antenna system provided in the second embodiment of the utility model. The second embodiment of the utility model provides an electromagnetic capacitance handwriting device, which can be an electromagnetic capacitance handwriting board or an electromagnetic capacitance handwriting screen, including a shell, a handwriting antenna board, an electromagnetic handwriting control module, a capacitive handwriting control module and a handwriting pen. The handwriting antenna board, the electromagnetic handwriting control module and the capacitive handwriting control module are accommodated in the shell, and the handwriting pen is used to write on the handwriting antenna board. The handwriting antenna board includes an electromagnetic capacitance handwriting antenna system 30, and the electromagnetic capacitance handwriting antenna system 30 is electrically connected to the electromagnetic handwriting control module and the capacitive handwriting control module.

[0039] The electromagnetic capacitance handwriting antenna system 30 includes a sensing unit. When the stylus writes on the handwriting antenna board, the sensing unit senses the writing signal of the stylus to confirm the writing coordinates of the stylus. The sensing unit includes an antenna 31, a first main switch 32, an electromagnetic simulation channel 33, a first analog switch 35, a second main switch 36, a capacitance simulation channel 37 and a second analog switch 39. The antenna 31 is in a strip shape, the number is a, and the queue is arranged, a≥2, and a is an integer. Each of the antennas 31 includes a first end 311 and a second end 312 opposite to each other. The number of the electromagnetic simulation channels 33 is b, and the queue is arranged, b≥2, and b is an integer. The number of the first analog switches 35 is at least a*b, and each of the first ends 311 is electrically connected to b electromagnetic simulation channels 33 through the first analog switch 35, and the electromagnetic simulation channel 33 is used to transmit electromagnetic signals. Each of the electromagnetic simulation channels 33 is connected to the first analog switch 35 through the first main switch 32.

[0040] In this embodiment, for every two adjacent electromagnetic simulation channels 23, one electromagnetic simulation channel 23 is used for grounding, and the other electromagnetic simulation channel 23 is used for connecting to a signal receiving module. In other embodiments, only at least one of the electromagnetic simulation channels needs to be grounded, and at least one needs to be connected to a signal amplifier, so as to form a closed loop antenna with the two antennas.

[0041] The number of the capacitance simulation channels 37 is c, c ≥ 1, and c is an integer. The number of the second analog switches 39 is at least a*c, and each of the second ends 312 is electrically connected to c capacitance simulation channels 37, and the capacitance simulation channels 37 are used to transmit capacitance signals. Each of the capacitance simulation channels 37 is electrically connected to the second analog switch 39 through the second main switch 36.

[0042] The sensing unit includes a first sensing unit and a second sensing unit, the antenna 31 of the first sensing unit is arranged along a first direction, the antenna 31 of the second sensing unit is arranged along a second direction, and the angle between the first direction and the second direction is non-zero. When the electromagnetic capacitive handwriting device is in an electromagnetic handwriting mode, the first sensing unit senses the coordinates of the stylus in the first direction, and the second sensing unit senses the coordinates of the stylus in the second direction, thereby confirming the two-dimensional coordinates of the stylus. When the electromagnetic capacitive handwriting device is in a capacitive handwriting mode, the antennas 31 in the first direction and the second direction are cross-coupled, and the two-dimensional coordinates of the stylus are confirmed by identifying the capacitance change at the coupling point. Preferably, the first direction and the second direction are perpendicular to each other.

[0043] It can be understood that the number of antennas and the number of electromagnetic simulation channels of the first sensing unit and the second sensing unit can be the same or different, and those skilled in the art can set them according to actual needs.

[0044] The sensing unit can work in an electromagnetic handwriting mode and a capacitive handwriting mode. When the sensing unit is in the electromagnetic handwriting mode, the first end 311 of the target antenna is connected to the target electromagnetic channel by selecting the first analog switch 35, and the second end 312 of the target antenna connected to the target capacitive channel is connected to each other by selecting the second analog switch 39, and the second main switch 36 connected to the target capacitive channel is disconnected at the same time, so that a closed loop antenna can be formed to sense the coordinates of the stylus, wherein the target antenna is any two antennas in the antenna 31, the target electromagnetic channel is two electromagnetic analog channels in the electromagnetic analog channel 33, and one is used for grounding and the other is used for connecting a signal receiving module, and the target capacitive channel is any capacitive analog channel in the capacitive analog channel 37.

[0045] It can be understood that the number of the antennas 31, the electromagnetic simulation channels 33 and the capacitance simulation channels 37 restricts the number of antenna loops that can be formed at the same time, and two antennas 31, two electromagnetic simulation channels 33 and one capacitance simulation channel 37 constitute an antenna loop. For example, if the number of the antennas 31 a≥2c, the number of the electromagnetic simulation channels 33 b≥2c, then c antenna loops can be formed at the same time, that is, when the number of the capacitance simulation channels 37 c=1, only one antenna loop can be formed at the same time, and when the number of the capacitance simulation channels 37 c≥2, two or more antenna loops can be formed at the same time. For another example, if the number of the electromagnetic simulation channels 33 b≥a, the number of the capacitance simulation channels 37 c≥a / 2, then [a / 2] antenna loops can be formed at the same time, that is, when the number of the antennas 31 a=2 or 3, only one antenna loop can be formed at the same time, and when the number of the antennas 31 a≥4, two or more antenna loops can be formed at the same time. For another example, if the number a≥b of the antennas 31 and the number c≥b / 2 of the capacitance simulation channels 37, [b / 2] antenna loops can be formed at the same time, that is, when the number b=2 or 3 of the electromagnetic simulation channels 33, only one antenna loop can be formed at the same time, and when the number b≥4 of the electromagnetic simulation channels 33, two or more antenna loops can be formed at the same time.

[0046] When the sensing unit is in the capacitive handwriting mode, the first end 311 is disconnected from the electromagnetic analog channel 33 to form a high impedance. By turning on the second analog switch 39 to connect the second end 312 and the capacitive analog channel 37, the capacitance change of the coupling point of the antenna 31 can be detected.

[0047] Here, the working principle of the electromagnetic capacitance handwriting antenna system 30 is explained by taking the first sensing unit as an example. Figure 4, set a=10, the first ends 311 of the 10 antennas 31 are antenna ends T0~T9 respectively, and the second ends 312 are antenna ends S0-S9 respectively, b=8, the 8 electromagnetic simulation channels 33 are electromagnetic simulation channels A0~A7 respectively, electromagnetic simulation channels A0, A2, A4 and A6 are grounded, electromagnetic simulation channels A1, A3, A5 and A7 are used to connect to the signal receiving module, the number of the second analog switches 35 is 10*8, and the 8 capacitive simulation channels are capacitive simulation channels B0-B7 respectively. In the electromagnetic handwriting mode, if it is necessary to form a T0-T1 antenna loop, the first analog switch A1T0 can be enabled to connect the antenna end T0 with the electromagnetic analog channel A1, the first analog switch A0T1 can be enabled to connect the antenna end T1 with the electromagnetic analog channel A0, and the second analog switches B7S0 and B7S1 can be enabled at the same time, and the second main switch 36 connected to the capacitive analog channel B7 can be disconnected to form a closed antenna loop between the antenna T0-T1; in the capacitive handwriting mode, the first main switch 32 and / or the first analog switch 35 are disconnected to form a high resistance, and the antenna 31 to be detected is enabled. If the antenna T0S0 needs to be detected, the second analog switch B7S0 can be enabled to detect the capacitance change. When multiple of the second analog switches are enabled at the same time to connect multiple antennas 31 with the corresponding multiple capacitive analog channels 37, multiple antennas 31 can be scanned at the same time to improve the scanning efficiency.

[0048] The above descriptions are only some embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the utility model specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An electromagnetic handwriting antenna system, characterized in that: The invention comprises a sensing unit, wherein the sensing unit comprises: a antennas are arranged in a row, each of the antennas comprises a first end and a second end opposite to each other, the second end is connected to a common end; b electromagnetic analog channels and at least a*b first analog switches, each of the first ends is electrically connected to b electromagnetic analog channels through the first analog switch, and the electromagnetic analog channels are used to transmit electromagnetic signals, Wherein, a≥2, b≥2, and a and b are integers.

2. The electromagnetic handwriting antenna system according to claim 1, characterized in that: The sensing unit includes a first sensing unit and a second sensing unit, the antenna of the first sensing unit is arranged along a first direction, the antenna of the second sensing unit is arranged along a second direction, and the angle between the first direction and the second direction is non-zero.

3. The electromagnetic handwriting antenna system according to claim 1, characterized in that: The antenna is in a strip shape. Among the b electromagnetic simulation channels, at least one electromagnetic simulation channel is used for grounding, and at least one electromagnetic simulation channel is used for connecting a signal receiving module.

4. An electromagnetic handwriting device, comprising a housing, a handwriting antenna board and an electromagnetic handwriting control module, wherein the handwriting antenna board and the electromagnetic handwriting control module are accommodated in the housing, characterized in that: The handwriting antenna board includes an electromagnetic handwriting antenna system, and the electromagnetic handwriting antenna system is electrically connected to the electromagnetic handwriting control module. The electromagnetic handwriting antenna system is the electromagnetic handwriting antenna system as described in any one of claims 1-3.

5. An electromagnetic capacitance handwriting antenna system, characterized in that: The invention comprises a sensing unit, wherein the sensing unit comprises: a antennas arranged in a row, each of the antennas comprising a first end and a second end opposite to each other; b electromagnetic analog channels and at least a*b first analog switches, each of the first ends is electrically connected to b electromagnetic analog channels through the first analog switch, and the electromagnetic analog channels are used to transmit electromagnetic signals; c capacitance simulation channels and at least a*c second analog switches, each of the second ends is electrically connected to c capacitance simulation channels through the second analog switch, and the capacitance simulation channels are used to transmit capacitance signals, Among them, a≥2, b≥2, c≥1, and a, b, c are integers.

6. The electromagnetic capacitance handwriting antenna system according to claim 5, characterized in that: The number of the antennas a≥4, the number of the electromagnetic simulation channels b≥4, and the number of the capacitance simulation channels c≥2.

7. The electromagnetic capacitance handwriting antenna system according to claim 5, characterized in that: It also includes a first main switch, and each of the electromagnetic simulation channels is connected to the first analog switch through the first main switch.

8. The electromagnetic capacitance handwriting antenna system according to claim 5, characterized in that: It also includes a second main switch, each of the capacitance simulation channels is electrically connected to the second analog switch through the second main switch, and the second main switch is used to disconnect the second main switch connected to the target capacitance channel when the electromagnetic capacitance handwriting antenna system is in the electromagnetic handwriting mode, the first end of the target antenna is connected to the target electromagnetic channel, and the second end of the target antenna connected to the target capacitance channel is connected to each other, wherein the target antenna is any two antennas among the antennas, the target electromagnetic channel is two electromagnetic simulation channels among the electromagnetic simulation channels, one of which is grounded and the other is connected to a signal receiving module, and the target capacitance channel is any one of the capacitance simulation channels.

9. The electromagnetic capacitance handwriting antenna system according to claim 5, characterized in that: The number of the sensing units is two, namely a first sensing unit and a second sensing unit. The antenna of the first sensing unit is arranged along a first direction, and the antenna of the second sensing unit is arranged along a second direction. The angle between the first direction and the second direction is non-zero.

10. The electromagnetic capacitance handwriting antenna system according to claim 5, characterized in that: The antenna is in a strip shape. Among the b electromagnetic simulation channels, at least one electromagnetic simulation channel is used for grounding, and at least one electromagnetic simulation channel is used for connecting a signal receiving module.

11. An electromagnetic capacitive handwriting device, comprising a housing, a handwriting antenna board, an electromagnetic handwriting control module and a capacitive handwriting control module, wherein the handwriting antenna board, the electromagnetic handwriting control module and the capacitive handwriting control module are accommodated in the housing, characterized in that: The handwriting antenna board includes an electromagnetic capacitance handwriting antenna system, which is electrically connected to the electromagnetic handwriting control module and the capacitive handwriting control module. The electromagnetic capacitance handwriting antenna system is the electromagnetic capacitance handwriting antenna system as described in any one of claims 5-10.

Images