CN115097955A - Controller and electromagnetic handwriting equipment - Google Patents
Controller and electromagnetic handwriting equipment Download PDFInfo
- Publication number
- CN115097955A CN115097955A CN202210745362.8A CN202210745362A CN115097955A CN 115097955 A CN115097955 A CN 115097955A CN 202210745362 A CN202210745362 A CN 202210745362A CN 115097955 A CN115097955 A CN 115097955A
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- Prior art keywords
- handwriting
- rotating wheel
- controller
- electromagnetic
- receiving
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
Abstract
The invention provides a controller and an electromagnetic handwriting device. The controller includes: the rotating wheel assembly and the receiving and transmitting unit. The runner assembly includes a runner. The receiving and transmitting unit comprises an LC resonance circuit and is contained in the rotating wheel assembly, so that the rotating wheel drives the receiving and transmitting unit to rotate.
Description
Technical Field
The invention relates to the technical field of electronic sensors, in particular to a controller and electromagnetic handwriting equipment.
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.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides a controller and an electromagnetic handwriting apparatus.
A first aspect of the present invention provides a controller applied to an electromagnetic handwriting apparatus, the controller comprising: runner assembly and transceiver unit, the runner assembly includes: a rotating wheel. The transceiver unit includes: an LC resonance circuit. The receiving and sending unit is contained in the rotating wheel assembly, so that the rotating wheel drives the receiving and sending unit to rotate.
Optionally, the LC resonant circuit includes a capacitor C1 and an inductor L1, and the transceiver unit further includes: and the micro switch is electrically connected with the capacitor C1 in series and is used for changing the resonant frequency of the LC resonant circuit.
Optionally, the wheel assembly further includes a control module board, and the control module board is disposed in the wheel.
Optionally, the number of the LC resonant circuits disposed on the control module board is 1 or more.
Optionally, when the number of the LC resonant circuits is 1, the number of the micro switches is set to 1, and the micro switches are disposed at the center of the rotating wheel.
Optionally, when the number of the LC resonant circuits is 1, the number of the micro switches is N, the micro switches are arranged at the edge of the rotating wheel at intervals at a preset angle of a °, and the N micro switches correspond to N directions respectively.
Optionally, when the number of the LC resonant circuits is two, the number of the micro switches is set to 1, wherein one of the LC resonant circuits has an inductor disposed on the rotation axis of the rotation wheel, and the other LC resonant circuit has an inductor disposed at an edge position of the rotation wheel, and the resonant frequencies of the two LC resonant circuits are respectively higher and lower than the operating frequency of the stylus pen, which is included in the electromagnetic handwriting device.
Optionally, the controller further includes an upper shell and a base, and the upper shell drives the wheel assembly to rotate or press relative to the base.
The second aspect of the present invention also provides a controller applied to an electromagnetic handwriting apparatus, the controller including: runner assembly, transceiver unit and control circuit, the runner assembly includes: a rotating wheel; the transceiver unit includes: the LC resonance circuit is used for receiving electromagnetic energy sent by the electromagnetic handwriting equipment and sending an oscillation signal to the electromagnetic handwriting equipment; the control circuit is used for controlling the state of the LC resonance circuit according to the rotation direction information of the rotating wheel or transmitting the rotation direction information of the rotating wheel; the receiving and sending unit is accommodated in the rotating wheel assembly, so that the rotating wheel drives the receiving and sending unit to rotate.
The present invention also provides an electromagnetic handwriting apparatus, characterized in that the electromagnetic handwriting apparatus comprises: the handwriting module comprises a handwriting pen and a handwriting board corresponding to the handwriting pen, the handwriting board is provided with a transmitting and receiving unit, and the controller and the handwriting module share the transmitting and receiving unit.
Optionally, the handwriting module includes a handwriting pen and a handwriting pad corresponding to the handwriting pen, the handwriting pen and the controller have different operating frequencies, and the controller is placed in the handwriting area of the handwriting pad in an operating state.
Optionally, the transmitting and receiving unit includes: the antenna is arranged below the rotating wheel and used for transmitting electromagnetic waves with preset frequency in a transmission period so that the first LC resonant circuit receives energy in the transmission period; the rotating wheel assembly further comprises a bearing, and the rotating wheel is fixed above the antenna through the bearing.
In an embodiment of the present application, the controller includes: the rotating wheel assembly and the receiving and transmitting unit. The runner assembly includes a control module plate and a runner. The control module board is arranged in the rotating wheel. The transceiver unit comprises a first LC resonance circuit, wherein the first LC resonance circuit comprises a first inductance L1 and a first capacitance C1. The first inductance L1 is provided with a ferrite core.
The receiving and sending unit is accommodated in the rotating wheel assembly, so that the rotating wheel assembly drives the receiving and sending unit to rotate. In the embodiment of the application, the controller rotating wheel rotates, so that the position coordinate of the controller changes, the rotating direction of the controller rotating wheel can be determined through the changing track, and certain adjusting work can be completed according to the rotating direction. The controller is a coding switch, has flexible structural design, can be suitable for various equipment, has flexible operation and no noise, and has lower cost than the traditional coding switch.
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 possible electromagnetic handwriting device provided by an embodiment of the present application;
fig. 3 is a block diagram of a possible LC resonant tank according to an embodiment of the present disclosure;
fig. 4 is a cross-sectional view of a possible electromagnetic handwriting apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the electromagnetic handwriting apparatus 1 includes a handwriting pad 10 and a handwriting pen 20, where the handwriting pen 20 emits electromagnetic waves when the electromagnetic handwriting apparatus 1 works, and after the electromagnetic waves are sensed by sensors arranged on the handwriting pad 10, the position of the handwriting pen 20 is calculated and reported to a computer, and then the computer moves a cursor or performs other corresponding actions.
For better understanding of the present solution, please refer to fig. 2, and fig. 2 is a system block diagram of an electromagnetic handwriting device 20 with a controller according to an embodiment of the present application, where the electromagnetic handwriting device includes a controller 210, and the controller operates on the same principle as an electromagnetic handwriting pen, and operates in a handwriting area of a handwriting board simultaneously with the electromagnetic handwriting pen by using a different operating frequency than the electromagnetic handwriting pen. Specifically referring to fig. 2, the controller 210 includes a wheel assembly 211 and a transceiver unit 212, where the wheel assembly 211 includes a wheel 2112, and in practical applications, the wheel assembly may further include a control module board, that is, the wheel 2112 may or may not have a control module board. For convenience of description, in the embodiment of the present application, the wheel assembly 211 includes the control module board, and the control module board is a PCB (printed circuit board) for example, and in practical application, the control module board may also be a FPC (flexible printed circuit board), which is not limited specifically. The PCB is arranged in the rotating wheel; the transceiver unit 212 includes an LC resonant circuit 2120, the LC resonant circuit 2120 includes a first inductor L1 and a first capacitor C1 connected to the first inductor L1, the first inductor L1 has a ferrite core, and the first inductor L1 is used for receiving and transmitting electromagnetic waves, as shown in fig. 3, which is a block diagram of a possible LC resonant tank provided in the embodiments of the present application. Optionally, the transceiver unit 212 may further include a micro switch R1 electrically connected in series with the first capacitor C1, and the pressing of the micro switch changes the resonant frequency of the first LC resonant circuit 2120.
The transceiver unit 212 includes: 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 LC resonant circuit 2120 receives energy during the transmission period; and an antenna selection switch 2120 connected to the first antenna 2121.
It should be noted that the rotating wheel assembly 211 may further include a coil assembly, where the coil assembly is configured to receive electromagnetic waves and generate electric energy, and may also be configured to transmit a pressure-sensitive signal, and of course, the coil assembly may include 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 configured to generate electric energy, and one coil is configured to transmit a pressure-sensitive signal.
In practical applications, the turning wheel 2112 is fixed above the antenna through a bearing, so that the rotation is more stable and flexible.
The LC resonant circuit 2120 includes a first inductor L1 and a first capacitor C1 connected to the first inductor L1. A ferrite core is disposed in the first 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 LC resonant circuit 2120 is changed.
Optionally, the transceiver unit 212 includes a first antenna 2121, 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, a detector 2128 and a sample holder 2129 serially connected to the antenna selection switch 2122 and the MCU processor 2126, an antenna transmission signal driver 2130 serially connected to 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) serially connected 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 characteristics 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-to-one analog switch, and the number of the eight-to-one analog switches is generally 5 to 8, which is selected 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.
In addition, the controller comprises a logic circuit or an MCU (microprogrammed control Unit), and can control the state of the LC resonance circuit according to the rotating direction of the rotating wheel or transmit the rotating direction information of the rotating wheel through radio frequency. Optionally, in this embodiment of the application, the number of the LC resonant circuits of the magenta paper on the PCB board is 1 or more.
When a group of LC resonance circuits 2120 is arranged on the PCB, the number of the micro switches is set to be 1, wherein the micro switches are arranged in the center of the rotating wheel, and selection confirmation is indicated by pressing down the switches.
Optionally, when a set of first LC resonant circuits may be further disposed on the PCB, N micro switches may be disposed, where the micro switches are respectively spaced at preset angles a ° to be arranged at edge positions of the rotating wheel, and the N micro switches respectively correspond to N directions, where a is greater than N is equal to 360. For example, when N is 4, it indicates that 4 micro switches are disposed on the PCB, and the 4 micro switches are disposed at intervals 360/4 of 90 ° and arranged at edge positions of the wheel, and the 4 micro switches correspond to 4 directions, respectively.
Optionally, the PCB may further be provided with two sets of the LC resonant circuits and one micro switch, and a resonant frequency of the LC resonant circuit is different from that of the stylus pen, wherein a first inductor of one set of the LC resonant circuits is disposed on a rotation shaft of the rotating wheel, and is used to position the controller on the antenna of the tablet; and the first inductor of the other group of LC resonant circuits is arranged at the edge position of the rotating wheel and used for detecting the rotation of the rotating wheel. It should be noted that the resonant frequencies of the two sets of LC resonant circuits should be higher and lower than the operating frequency of the stylus pen, respectively, that is, the resonant frequency of one set of LC resonant circuit is higher than the operating frequency of the stylus pen, and the resonant frequency of the other set of LC resonant circuit is lower than the operating frequency of the stylus pen, so as to prevent mutual interference on the same antenna, and identify the state of the key by the signal amplitude.
The resonant frequencies of the two groups of LC resonant circuits are respectively higher and lower than the working frequency of a stylus pen contained in the electromagnetic handwriting device.
For easy understanding, please refer to fig. 4, which is a cross-sectional view of a structure of a possible electromagnetic handwriting device provided in an embodiment of the present application, where the electromagnetic handwriting device 400 is a dual magnetic core, and includes a first magnetic core 401 and a second magnetic core 402, where the first magnetic core 401 is located at an axis of a rotating wheel 403, the rotating wheel 403 is fixed on a base 408 through a bearing 404, it should be noted that the bearing 404 may be replaced by a ball or directly omitted, and there is a spring or an elastic sheet to ensure that the rotating wheel performs a fine motion when not pressed, the micro switch 405 is in an off state, and the micro switch 405 is turned on when the rotating wheel 403 is pressed. The PCB 407 is fixed at the top end inside the runner 403, and in practical applications, the fixing manner may be a snap fixing, a screw fixing, or an adhesive fixing, and is not limited herein. When there is only one set of LC resonant circuits, the micro switch 405 can be placed in the center of the PCB board 406, i.e. the axial center of the wheel 403. If the controller is a single core, the first core is not provided in the case of the single core.
In addition, the electromagnetic handwriting device 20 further includes a handwriting module, the handwriting module includes a handwriting pad and a handwriting pen 22, wherein the handwriting pen 22 includes a second LC resonant circuit 221 and a second antenna 222, and the second antenna 222 is configured to perform energy transceiving with the second LC resonant circuit 221.
Optionally, the controller 210 further includes a base and an upper shell, and the upper shell can drive the wheel assembly to rotate or press relative to the base. In practical applications, the first inductor L1 on the PCB board may be disposed near the base and at the edge.
In this embodiment, the controller 210 and the handwriting module 22 share the transmitting and receiving unit 212.
It should be noted that the controller 210 is structurally independent, but the controller must be placed in the handwriting area of the handwriting board in an operating state so as to be perceived by the handwriting board. And the controller 210 and the stylus pen have different operating frequencies so that the handwriting pad can be accurately recognized.
It should be noted that in the embodiment of the present application, the number of the transceiver units 212 may be set to 1, or may be set to 3, for example, when the number of the transceiver units 212 is set to 3, 1 group of LC resonant circuits is disposed on the PCB board of the wheel. In summary, in the embodiment of the present application, an electromagnetic induction technology is adopted, a first LC resonant circuit is disposed on the PCB in the controller 210, and the first inductor L1 is provided with a ferrite core, and the core inductor can receive and transmit electromagnetic waves. 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 resonant circuit receives energy during the transmit phase, and after transmission ceases, L exchanges energy with C to produce free-running 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.
In another possible embodiment, the controller further includes a control circuit in addition to the wheel assembly and the transceiver unit, that is, the wheel assembly includes: a rotating wheel. The transceiver unit includes: and the LC resonance circuit is used for receiving the electromagnetic energy sent by the electromagnetic handwriting equipment and sending an oscillation signal to the electromagnetic handwriting equipment, and the receiving and transmitting unit is accommodated in the rotating wheel assembly so that the rotating wheel drives the receiving and transmitting unit to rotate. And the control circuit is used for controlling the state of the LC resonance circuit according to the rotation direction information of the rotating wheel or transmitting the rotation direction information of the rotating wheel. I.e. the control circuit controls the state of the LC tank with the rotation direction information of the wheel as a digital coded signal like 101010.
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 (11)
1. A controller for use with an electromagnetic handwriting device, the controller comprising: a rotating wheel assembly and a receiving and transmitting unit,
the runner assembly includes: a rotating wheel;
the transceiver unit includes: an LC resonance circuit;
the receiving and sending unit is contained in the rotating wheel assembly, so that the rotating wheel drives the receiving and sending unit to rotate.
2. The controller of claim 1, wherein the LC resonant circuit comprises a capacitor C1 and an inductor L1, and wherein the transceiver unit further comprises:
and the micro switch is electrically connected with the capacitor C1 in series and is used for changing the resonant frequency of the LC resonant circuit.
3. The controller of claim 2, wherein the wheel assembly further comprises a control module board, the control module board being disposed within the wheel.
4. The controller according to claim 3, wherein the number of the LC resonance circuits provided on the control module board is 1 or more.
5. The controller according to claim 4, wherein when the number of said LC resonance circuits is 1, the number of said micro switch is set to 1, said micro switch being disposed at a central position of said wheel.
6. The controller according to claim 4, wherein when the number of the LC resonant circuits is 1, the number of the micro switches is N, the micro switches are arranged at the edge of the wheel at intervals of a predetermined angle a °, and the N micro switches correspond to N directions.
7. The controller according to claim 4, wherein when the number of the LC resonant circuits is two, the number of the micro switches is set to 1, wherein the inductance of one of the LC resonant circuits is provided on the rotation axis of the rotation wheel, the inductance of the other LC resonant circuit is provided at an edge position of the rotation wheel, the resonant frequencies of the two LC resonant circuits are respectively higher and lower than the operating frequency of a stylus pen included in the electromagnetic writing apparatus.
8. A controller applied to an electromagnetic handwriting device, characterized by comprising: a rotating wheel assembly, a receiving and transmitting unit and a control circuit,
the runner assembly includes: a rotating wheel;
the transceiver unit includes:
the LC resonance circuit is used for receiving electromagnetic energy sent by the electromagnetic handwriting equipment and sending an oscillation signal to the electromagnetic handwriting equipment;
the control circuit is used for controlling the state of the LC resonance circuit according to the rotation direction information of the rotating wheel or transmitting the rotation direction information of the rotating wheel;
the receiving and sending unit is accommodated in the rotating wheel assembly, so that the rotating wheel drives the receiving and sending unit to rotate.
9. An electromagnetic handwriting device, characterized in that it comprises: the handwriting module and the controller of any one of claims 1-8, the handwriting module comprising a handwriting pen and a handwriting pad corresponding to the handwriting pen, the handwriting pad being provided with a transmitting and receiving unit, the controller and the handwriting module sharing the transmitting and receiving unit.
10. The electromagnetic handwriting device of claim 9, wherein said stylus and said controller are operated at different frequencies, wherein said controller is positioned in a handwriting area of said tablet when in an operational state.
11. The electromagnetic handwriting device of claim 10, wherein said transmit-receive unit comprises:
the antenna is arranged below the rotating wheel and used for transmitting electromagnetic waves with preset frequency in a transmitting period so that the first LC resonant circuit receives energy in the transmitting period;
the rotating wheel assembly further comprises a bearing, and the rotating wheel is fixed above the antenna through the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745362.8A CN115097955A (en) | 2022-06-27 | 2022-06-27 | Controller and electromagnetic handwriting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745362.8A CN115097955A (en) | 2022-06-27 | 2022-06-27 | Controller and electromagnetic handwriting equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115097955A true CN115097955A (en) | 2022-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210745362.8A Pending CN115097955A (en) | 2022-06-27 | 2022-06-27 | Controller and electromagnetic handwriting equipment |
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| Country | Link |
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| CN (1) | CN115097955A (en) |
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 |
-
2022
- 2022-06-27 CN CN202210745362.8A patent/CN115097955A/en active Pending
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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