CN217113243U - Handwriting device with electromagnetic coding switch - Google Patents
Handwriting device with electromagnetic coding switch Download PDFInfo
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- CN217113243U CN217113243U CN202220387881.7U CN202220387881U CN217113243U CN 217113243 U CN217113243 U CN 217113243U CN 202220387881 U CN202220387881 U CN 202220387881U CN 217113243 U CN217113243 U CN 217113243U
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Abstract
The utility model provides a handwriting device with electromagnetic type coding switch, the flexible noiselessness of operation, handwriting device includes: electromagnetic type code switch, electromagnetic type code switch module includes runner assembly and transceiver unit, wherein, the runner assembly includes: a first LC resonance circuit; the first LC resonance circuit is arranged on the rotating wheel; the transceiver unit includes: the first antenna is arranged below the rotating wheel and used for transmitting magnetic waves with preset frequency in a transmitting period so that the first LC resonant circuit receives energy in the transmitting period; an antenna selection switch connected to the antenna; a handwriting module, so the handwriting module comprises: a second LC resonance circuit; a second antenna for transmitting and receiving energy to and from the second LC resonant circuit; the electromagnetic coding switch module and the handwriting module share the transceiver unit.
Description
Technical Field
The utility model relates to an electronic sensor technical field especially relates to a handwriting device with electromagnetic type coding switch.
Background
The handwriting board, also known as a digital board, a drawing board, a hand drawing board and the like, is one of input devices of computers, tablet computers, embedded systems and the like, generally consists of a handwriting board and a pressure-sensitive handwriting pen, is mainly used for design-class office workers as the aspect of drawing creation, and mainly faces design and art-related professionals, advertising companies, design studios, Flash vector animation production and the like. The handwriting board hardware adopts the electromagnetic induction principle, and the cursor positioning and moving process is completely completed through electromagnetic induction. With the continuous progress of the technology, the handwriting board develops towards the direction of more and more convenient use and maintenance, and the passive wireless handwriting board becomes the new main technical development direction, wherein the passive mode means that no battery exists in the handwriting pen, and the wireless mode means that the handwriting board is connected with the host machine through wireless communication without a common connecting wire.
The coding switch for the handwriting board comprises a mechanical type, a photoelectric type, a Hall switch type and the like, the rotation information of a rotating wheel (or a rotating disc) is stirred by a handle is transmitted to the single chip microcomputer, the rotation direction is judged by the single chip microcomputer, and a series of operations are completed according to the rotation direction, so that the coding switch is similar to the Hall switch type coding switch. However, in the prior art, the coding switches all have the problems of rotation noise or high cost, so how to provide a coding switch in the handwriting board with low noise and low cost is a problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
In view of the deficiencies of the prior art, the utility model provides a handwriting device with electromagnetic type encoder switch, handwriting device includes: electromagnetic type code switch, electromagnetic type code switch module includes runner assembly and transceiver unit, wherein, the runner assembly includes: a first LC resonance circuit; the first LC resonance circuit is arranged on the rotating wheel; the transceiver unit includes: the first antenna is arranged below the rotating wheel and used for transmitting magnetic waves with preset frequency in a transmitting period so that the first LC resonant circuit receives energy in the transmitting period; an antenna selection switch connected to the antenna; a handwriting module, so the handwriting module comprises: a second LC resonance circuit; a second antenna for transmitting and receiving energy to and from the second LC resonant circuit; the electromagnetic coding switch module and the handwriting module share the transceiver unit.
Optionally, the wheel assembly further includes a bearing, and the wheel is fixed above the antenna through the bearing.
Optionally, the transceiver unit further includes: the antenna comprises a first amplifier, a second amplifier, a comparator, an MCU processor, a wireless module, a detector, a sampling retainer and an antenna emission signal driver, wherein the first amplifier and the second amplifier are sequentially connected with the antenna selection switch in series, the detector and the sampling retainer are connected between the second amplifier and the MCU processor in series, and the antenna emission signal driver is connected between the antenna selection switch and the MCU processor in series.
Optionally, the electromagnetic coding switch further includes: the MCU processor is connected with a USB interface and a power management and rechargeable battery which are sequentially connected with the USB interface in series.
Optionally, the first antenna is formed by annular copper foil traces distributed in the X and Y directions.
Optionally, the electromagnetic encoding switch includes 3 groups of LC resonant circuits, the 3 groups of LC resonant circuits are arranged on the PCB of the rotating wheel at equal intervals, magnetic cores of inductors L of the LC resonant circuits are all arranged in a cylindrical shape, axes of the magnetic cores are perpendicular to the antenna, and resonant frequencies of the 3 groups of LC resonant circuits are different from each other.
Optionally, the inductor L1 is obliquely placed on the PCB board of the wheel.
Optionally, the inductance L1 of the first LC resonant circuit includes a shaped magnetic core, and two ends of the cross section of the shaped magnetic core are different in size.
Optionally, the first LC resonant circuit includes an inductor L1 and a capacitor C1 connected to the inductor L1, the inductor L1 has a magnetic core, and the inductor L1 is configured to receive and transmit electromagnetic waves.
Optionally, the antenna selection switch is an one-out-of-eight analog switch.
In an embodiment of the present application, the handwriting apparatus includes: electromagnetic type code switch, electromagnetic type code switch module includes runner assembly and transceiver unit, wherein, the runner assembly includes: a first LC resonance circuit; the first LC resonance circuit is arranged on the rotating wheel; the transceiver unit includes: the first antenna is arranged below the rotating wheel and used for transmitting magnetic waves with preset frequency in a transmitting period so that the first LC resonant circuit receives energy in the transmitting period; an antenna selection switch connected to the antenna; a handwriting module, so the handwriting module comprises: a second LC resonance circuit; a second antenna for transmitting and receiving energy to and from the second LC resonant circuit; the electromagnetic coding switch module and the handwriting module share the transceiving unit. In the embodiment of the application, the electromagnetic coding switch generates free oscillation with gradually attenuated amplitude at the natural resonant frequency through the first LC resonant circuit, and the free oscillation is processed by the antenna, so that the electromagnetic coding switch is low in noise and low in cost in the operation process.
Drawings
Fig. 1 is a schematic view of a handwriting apparatus according to an embodiment of the present application;
FIG. 2 is a system block diagram of a handwriting device with an electromagnetic encoder switch according to an embodiment of the present application;
fig. 3a is a signal amplitude diagram of an electromagnetic encoding switch provided in an embodiment of the present application;
FIG. 3b is a signal amplitude diagram of another electromagnetic encoding switch provided by an embodiment of the present application;
FIG. 3c is a diagram of a core shape of an electromagnetic code switch provided in an embodiment of the present application;
fig. 3d is a schematic diagram of a possible magnetic core according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, in order to provide a handwriting device according to an embodiment of the present application, the handwriting device 1 includes a handwriting board 10 and a handwriting pen 20, when the handwriting device works, the handwriting pen 20 emits electromagnetic waves, and after a sensor arranged on the handwriting board 10 senses the electromagnetic waves, a position of the handwriting pen 20 is calculated and reported to a computer, and then the computer performs a cursor movement or other corresponding actions.
For better understanding of the present invention, please refer to fig. 2, and fig. 2 is a system block diagram of a handwriting device 20 with an electromagnetic coding switch according to an embodiment of the present application, where the handwriting device 20 includes a handwriting board 21 and a handwriting module 22.
The writing pad 21 includes the electromagnetic coding switch 210, the electromagnetic coding switch 210 includes a wheel assembly 211, and the wheel assembly 211 includes: a first LC resonant circuit 2111, wherein the first LC resonant circuit 2111 includes an inductor L1 and a capacitor C1 connected to the inductor L1, the inductor L1 has a magnetic core, and the inductor L1 is used for receiving and transmitting electromagnetic waves; a runner 2112, the first LC resonance circuit 2111 being provided on the runner 2112; a transceiver unit 212, wherein the transceiver unit 212 comprises: a first antenna 2121 disposed below the runner 2112 and configured to emit an electromagnetic wave with a preset frequency during a transmission period, so that the first LC resonant circuit 2111 receives energy during the transmission period; and an antenna selection switch 2122 connected to the first antenna.
It should be noted that the rotating wheel assembly 211 may further include a coil assembly, where the coil assembly is used for receiving electromagnetic waves and generating electric energy, and may also be used for transmitting a pressure-sensitive signal, and of course, the coil assembly 10 may have only one coil, and the functions of generating electric energy and transmitting a pressure-sensitive signal are implemented by using one coil, and may also include two coils, one coil is used for generating electric energy, and one coil is used for transmitting a pressure-sensitive signal.
In the rotating wheel assembly 211, the magnetic core inductor L and the capacitor C are soldered on the PCB board in the rotating wheel, and 1 to 3 groups of LC resonant circuits may be provided.
In practical application, the rotating wheel 2112 is fixed above the antenna through a bearing, so that the rotation is more stable and flexible.
The first LC resonance circuit 2111 includes an inductance L1 and a capacitance C1 connected to the inductance L1. A ferrite core is disposed in the inductor L1, and the inductance of the inductor L1 is changed by the position of the ferrite core in the inductor L1, so that the resonant frequency of the first LC resonant circuit 2111 is changed.
The transceiver unit 212 includes a first antenna 2121 coupled to the inductor L1, an antenna selection switch 2122 connected to the antenna 2121, a first amplifier 2123, a second amplifier 2124, a comparator 2125, an MCU processor 2126 connected in series to the antenna selection switch 2122, a detector 2128 and a sample holder 2129 connected in series between the second amplifier 2124 and the MCU processor 2126, an antenna transmit signal driver 2130 connected in series between the antenna selection switch 2122 and the MCU processor 2126, a USB interface (not shown) connected to the MCU processor 2126, and a power management (not shown) and a rechargeable battery (not shown) connected in series to the USB interface (not shown).
In practical applications, the first antenna 2121 is formed by a circular copper foil trace, and the width and shape of the copper foil determine the electrical performance of the first antenna 2121. The copper foil may be distributed in X and Y directions, and the first antenna 2121 may have the same shape in both directions, and may have a square shape. One end of the first antenna 2121 is connected to the input end of the first amplifier 2123 through the antenna selection switch 2122, and the other end of the first antenna 2121 is grounded or directly grounded through the antenna selection switch 2122.
In an alternative embodiment of the present invention, the antenna selection switch 2122 is an eight-out-of-one analog switch, and the number of the eight-out-of-one analog switches is generally 5 to 8 according to the number of the antennas 2121. The first amplifier 2123 and the second amplifier 2124 are integrated operational amplifiers with a low noise gain-bandwidth product greater than 10 MHz. The MCU processor 2126 has ADC, USB, and SPI interfaces, and its operating clock frequency is 40 MHz. The detector 2128 is a diode detector circuit. The antenna transmit signal driver 2130 is a fire follower circuit. The wireless communication module is a Bluetooth module with an SPI interface. The sample holder 2129 is constituted by an RC integrating circuit.
It should be noted that the amplification and MCU control part can be integrated into a single chip, and then communicate with the product main control MCU by using a serial port.
Optionally, in the utility model, electromagnetic type coding switch 210 can include 3 LC resonant circuit of group, 3 LC resonant circuit of group equidistant range are in on the PCB board of runner, the magnetic core that inductance L of each LC resonant circuit has is the cylinder, the axis perpendicular to of magnetic core the antenna, 3 LC resonant circuit's of group resonant frequency is mutually different, utilizes frequency identification direction promptly, and 3 LC resonant circuit of group equidistant range are on the PCB in the runner, and the inductance magnetic core is cylinder or "worker" font, the perpendicular loop antenna of magnetic core axis. The resonant frequencies of the 3 groups of LC resonant circuits are different, if the resonant frequencies are A, B, C respectively, the clockwise rotation MCU processor detects the ABCCABC combined sequence, and the counterclockwise rotation MCU processor detects the ACBACBACB combined sequence, so that the frequency and amplitude of the free oscillation signal can be obtained, and the rotation information of the runner can be further determined.
Optionally, the inductor may be obliquely placed on a PCB of the wheel, and the direction may be identified by the amplitude of the induction signal. The inductor is placed obliquely on the PCB inside the wheel as shown in fig. 3 a. Because the magnetic core is inclined, the strength of the magnetic line passing through the magnetic core can be changed along with the distance from the magnetic core to the antenna, and the amplitude of the induction signal when the induction signal enters the antenna can be as shown in fig. 3b or 3c, so that the rotating direction of the rotating wheel can be judged according to the change condition of the signal amplitude.
The inductance L of the LC resonant circuit includes a special-shaped magnetic core, and the two ends of the cross section of the special-shaped magnetic core have different sizes, please refer to fig. 3d, which is a schematic diagram of a possible magnetic core provided in the embodiments of the present application. I.e. the direction is identified by the sensing signal amplitude. The inductance adopts the special-shaped magnetic core, one end of the cross section of the magnetic core is larger, the other end of the cross section of the magnetic core is smaller, the magnetic force line penetrating through the magnetic core can change along with the area of the magnetic core, the amplitude of an induction signal when the induction signal enters the transmitting antenna can be shown in figure 3b or figure 3c, and therefore the rotating direction of the rotating wheel can be judged according to the change condition of the signal amplitude.
In addition, the handwriting module 22 in the handwriting apparatus 20 includes a second LC resonant tank 221 and a second antenna 222, and the second antenna 222 is configured to transmit and receive energy to and from the second LC resonant tank 221.
In the embodiment of the present application, the electromagnetic encoding switch 210 and the handwriting module 22 share the transceiver 212.
To sum up, in this application embodiment, adopt the electromagnetic induction technique, be equipped with LC resonance circuit on the runner to inductance L has the ferrite core, and the electromagnetic wave can be received and launched to the magnetic core inductance. An annular antenna formed by winding a printed board copper foil is arranged below the wave wheel, and the annular antenna emits electromagnetic waves at the frequency of hundreds of kHz during working so as to ensure that an LC resonance circuit rotating to the upper part of the annular antenna can sense signals. The transmission is stopped after a certain time and then converted into a receiving signal. The LC tank receives energy during the transmit phase and after the transmit stops, L exchanges energy with C to produce free oscillations with gradually decaying amplitudes at the natural resonant frequency. The loop antenna turns to receive and then receives the free-running signal with gradually decaying amplitude. The signal is amplified and sent to a singlechip for processing. The frequency and amplitude of the signal are obtained, and the rotating direction of the rotating wheel can be judged according to the information. Therefore, the electromagnetic coding switch of the handwriting device provided by the embodiment of the application is flexible to operate and free from noise; the cost is lower than that of the traditional coding switch.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A handwriting device having an electromagnetic encoder switch, said handwriting device comprising:
the electromagnetic coding switch module comprises a rotating wheel assembly and a receiving and transmitting unit, wherein,
the runner assembly includes:
a first LC resonance circuit;
the first LC resonance circuit is arranged on the rotating wheel;
the transceiver unit includes:
the first antenna is arranged below the rotating wheel and used for transmitting magnetic waves with preset frequency in a transmitting period so that the first LC resonant circuit receives energy in the transmitting period;
an antenna selection switch connected to the antenna;
a handwriting module, so the handwriting module comprises:
a second LC resonance circuit;
a second antenna for transmitting and receiving energy to and from the second LC resonant circuit;
the electromagnetic coding switch and the handwriting module share the transceiver unit.
2. The handwriting apparatus according to claim 1, said wheel assembly further comprising a bearing,
the rotating wheel is fixed above the antenna through the bearing.
3. The handwriting device according to claim 1, characterized in that said transceiving unit further comprises:
the antenna selection switch comprises a first amplifier, a second amplifier, a comparator, an MCU processor, a wireless module, a detector, a sampling retainer and an antenna emission signal driver, wherein the first amplifier and the second amplifier are sequentially connected with the antenna selection switch in series, the detector and the sampling retainer are connected between the second amplifier and the MCU processor in series, and the antenna emission signal driver is connected between the antenna selection switch and the MCU processor in series.
4. The handwriting apparatus according to claim 3, characterized in that said electromagnetic coding switch further comprises:
the MCU processor is connected with a USB interface and a power management and rechargeable battery which are sequentially connected with the USB interface in series.
5. The handwriting device according to claim 1, characterized in that said first antenna is constituted by a circular copper foil trace distributed in X and Y directions.
6. The handwriting device according to claim 1, wherein said electromagnetic code switch includes 3 groups of LC resonant circuits, said 3 groups of LC resonant circuits are arranged on the PCB board of said wheel at equal intervals, the inductance L of each LC resonant circuit has a magnetic core arranged in a cylindrical shape, the axis of said magnetic core is perpendicular to said antenna, and the resonant frequencies of said 3 groups of LC resonant circuits are different from each other.
7. The handwriting device according to claim 1, characterized in that inductance L1 of said first LC resonance circuit is placed obliquely on the PCB board of said wheel.
8. The handwriting device according to claim 1, characterized in that inductance L1 of said first LC resonance circuit comprises a shaped magnetic core, the two ends of the cross section of said shaped magnetic core being different in size.
9. The handwriting device according to claim 1, characterized in that said first LC resonance circuit comprises an inductance L1 and a capacitance C1 connected to said inductance L1, said inductance L1 being provided with a magnetic core, said inductance L1 being used for receiving and transmitting electromagnetic waves.
10. The handwriting device according to claim 1, wherein said antenna selection switch is an one-out-of-eight analog switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220387881.7U CN217113243U (en) | 2022-02-23 | 2022-02-23 | Handwriting device with electromagnetic coding switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220387881.7U CN217113243U (en) | 2022-02-23 | 2022-02-23 | Handwriting device with electromagnetic coding switch |
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| Publication Number | Publication Date |
|---|---|
| CN217113243U true CN217113243U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220387881.7U Active CN217113243U (en) | 2022-02-23 | 2022-02-23 | Handwriting device with electromagnetic coding switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023072066A1 (en) * | 2021-11-01 | 2023-05-04 | 深圳绘王趋势科技股份有限公司 | Electromagnetic encoding switch and method and apparatus for calculating rotation information of runner |
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2022
- 2022-02-23 CN CN202220387881.7U patent/CN217113243U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023072066A1 (en) * | 2021-11-01 | 2023-05-04 | 深圳绘王趋势科技股份有限公司 | Electromagnetic encoding switch and method and apparatus for calculating rotation information of runner |
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Address after: 518108 1st Floor, Building 1, Huiwang Science and Technology Park, Shiyan Street, Tangtou Community, Shiyan Street, Baoan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Huewang Trend Technology Co.,Ltd. Address before: 518103 building 28, area 4, Huaide Cuigang Industrial Park, Fuyong street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN HUION ANIMATION TECHNOLOGY Co.,Ltd. |