WO2022260290A1 - 자기장 데이터를 보정하는 장치 및 방법 - Google Patents
자기장 데이터를 보정하는 장치 및 방법 Download PDFInfo
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Definitions
- One or more embodiments of the disclosure below relate to an apparatus and method for calibrating magnetic field data.
- An electronic device such as a smart watch having a bezel may include a Hall sensor that measures magnetic force.
- a hall sensor may be disposed below the bezel to detect rotation of the bezel. By measuring a change in magnetic force caused by the movement of a magnet, disposed on the bezel, corresponding to the rotation of the bezel, the angle of rotation can be recognized.
- the Hall sensor used to measure the aforementioned magnetic force may sense a magnetic field using a Hall effect.
- 'Hall effect' means that when a magnetic field is applied to a conductor through which current flows, a force (e.g., Lorentz force) is generated in a certain direction, and the flow of current is changed by this force, and two effects caused by this change in flow of current are generated. It refers to the occurrence of a voltage difference (hereinafter referred to as 'Hall voltage') at the detection end.
- magnets are disposed on the bezel to use the aforementioned Hall effect, and magnetic force in the electronic device changes whenever the bezel rotates, magnetic field disturbance may occur. Due to magnetic field disturbance, a fluctuating offset caused by a rotation variation of a bezel may occur in a geomagnetic sensing value. When an azimuth is calculated using geomagnetic data for which an offset is not compensated for, the calculated azimuth may contain an error.
- An electronic device includes a rotating body rotatably coupled to a bezel part of the electronic device about a rotation axis and including a plurality of magnets; a pair of Hall sensors disposed in the bezel part and sensing a magnetic field generated by the plurality of magnets; a magnetic sensor disposed in an inner space within the circumference of the rotating body; Second magnetic field data that is electrically connected to the pair of Hall sensors and the magnetic sensor and generated through sensing of the magnetic sensor based on first magnetic field data generated through sensing of the pair of Hall sensors a processor to calibrate; and a memory electrically connected to the processor.
- a method performed by an electronic device includes sensing a pair of hall sensors disposed on a bezel part of the electronic device to a rotating body rotatably coupled with respect to a rotating shaft with respect to the bezel part. generating first magnetic field data about a magnetic field induced by a plurality of included magnets; generating second magnetic field data through a magnetic sensor disposed in an inner space within the circumference of the rotating body; calculating a compensated offset value based on the angular position of the rotating body and the first magnetic field data; and correcting the second magnetic field data using the compensated offset value.
- FIG. 1 is a block diagram illustrating the configuration of an electronic device in a network environment according to an embodiment.
- FIGS. 2A and 2B are perspective views of an electronic device according to an exemplary embodiment.
- FIG 3 is an exploded perspective view of an electronic device according to an exemplary embodiment.
- 4A to 4C are diagrams illustrating arrangement of a pair of Hall sensors and a magnetic sensor in an electronic device according to an exemplary embodiment.
- FIG. 5 is a flowchart illustrating a method of correcting magnetic field data according to an exemplary embodiment.
- FIG. 6 is a diagram illustrating an example of first magnetic field data collected by a pair of Hall sensors according to an exemplary embodiment.
- FIG. 7 is a diagram illustrating acquisition of second magnetic field data collected by a magnetic sensor according to an exemplary embodiment.
- FIG. 8 is a flowchart illustrating an offset compensation operation for correcting second magnetic field data according to an exemplary embodiment.
- FIG. 9 is a diagram illustrating magnetic force deviations of a plurality of magnets according to an exemplary embodiment.
- FIG. 10 is a diagram illustrating a change in magnetic force caused by movement of a magnet due to rotation of a rotating body in an electronic device according to an exemplary embodiment.
- FIG. 11 is a diagram illustrating an operation of correcting second magnetic field data by an electronic device according to an exemplary embodiment.
- FIG. 1 is a block diagram of an electronic device 101 within a network environment 100, according to various embodiments.
- 2A and 2B are perspective views of an electronic device according to an exemplary embodiment.
- 3 is an exploded perspective view of an electronic device according to an exemplary embodiment.
- an electronic device 101 communicates with an electronic device 102 through a first network 198 (eg, a short-range wireless communication network) or through a second network 199. It may communicate with at least one of the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network). According to one embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108 .
- the electronic device 101 includes a processor 120, a memory 130, an input module 150, an audio output module 155, a display module 160, an audio module 170, a sensor module ( 176), interface 177, connection terminal 178, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196 , or the antenna module 197 may be included.
- at least one of these components eg, the connection terminal 178) may be omitted or one or more other components may be added.
- some of these components eg, sensor module 176, camera module 180, or antenna module 197) are integrated into a single component (eg, display module 160). It can be.
- the processor 120 for example, executes software (eg, the program 140) to cause at least one other component (eg, hardware or software component) of the electronic device 101 connected to the processor 120. It can control and perform various data processing or calculations. According to one embodiment, as at least part of data processing or operation, the processor 120 transfers instructions or data received from other components (e.g., sensor module 176 or communication module 190) to volatile memory 132. , processing commands or data stored in the volatile memory 132 , and storing resultant data in the non-volatile memory 134 .
- software eg, the program 140
- the processor 120 transfers instructions or data received from other components (e.g., sensor module 176 or communication module 190) to volatile memory 132. , processing commands or data stored in the volatile memory 132 , and storing resultant data in the non-volatile memory 134 .
- the processor 120 may include a main processor 121 (eg, a central processing unit or an application processor) or a secondary processor 123 (eg, a graphic processing unit, a neural network processing unit ( NPU: neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor).
- a main processor 121 eg, a central processing unit or an application processor
- a secondary processor 123 eg, a graphic processing unit, a neural network processing unit ( NPU: neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor.
- NPU neural network processing unit
- the secondary processor 123 may be implemented separately from or as part of the main processor 121 .
- the secondary processor 123 may, for example, take the place of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 is active (eg, running an application). ) state, together with the main processor 121, at least one of the components of the electronic device 101 (eg, the display module 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the related functions or states.
- the auxiliary processor 123 eg, image signal processor or communication processor
- may be implemented as part of other functionally related components eg, camera module 180 or communication module 190). have.
- the auxiliary processor 123 may include a hardware structure specialized for processing an artificial intelligence model.
- AI models can be created through machine learning. Such learning may be performed, for example, in the electronic device 101 itself where the artificial intelligence model is performed, or may be performed through a separate server (eg, the server 108).
- the learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning or reinforcement learning, but in the above example Not limited.
- the artificial intelligence model may include a plurality of artificial neural network layers.
- Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the foregoing, but is not limited to the foregoing examples.
- the artificial intelligence model may include, in addition or alternatively, software structures in addition to hardware structures.
- the memory 130 may store various data used by at least one component (eg, the processor 120 or the sensor module 176) of the electronic device 101 .
- the data may include, for example, input data or output data for software (eg, program 140) and commands related thereto.
- the memory 130 may include volatile memory 132 or non-volatile memory 134 .
- the program 140 may be stored as software in the memory 130 and may include, for example, an operating system 142 , middleware 144 , or an application 146 .
- the input module 150 may receive a command or data to be used by a component (eg, the processor 120) of the electronic device 101 from the outside of the electronic device 101 (eg, a user).
- the input module 150 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).
- the sound output module 155 may output sound signals to the outside of the electronic device 101 .
- the sound output module 155 may include, for example, a speaker or a receiver.
- the speaker can be used for general purposes such as multimedia playback or recording playback.
- a receiver may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.
- the display module 160 may visually provide information to the outside of the electronic device 101 (eg, a user).
- the display module 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device.
- the display module 160 may include a touch sensor set to detect a touch or a pressure sensor set to measure the intensity of force generated by the touch.
- the audio module 170 may convert sound into an electrical signal or vice versa. According to one embodiment, the audio module 170 acquires sound through the input module 150, the sound output module 155, or an external electronic device connected directly or wirelessly to the electronic device 101 (eg: Sound may be output through the electronic device 102 (eg, a speaker or a headphone).
- the audio module 170 acquires sound through the input module 150, the sound output module 155, or an external electronic device connected directly or wirelessly to the electronic device 101 (eg: Sound may be output through the electronic device 102 (eg, a speaker or a headphone).
- the sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101 or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the detected state. can do.
- the sensor module 176 may include, for example, an optical sensor, a motion sensor, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared sensor) ) sensor, biosensor, temperature sensor, humidity sensor, or light sensor.
- the sensor module 176 may include a pair of Hall sensors and a magnetic sensor. A pair of Hall sensors may sense magnetic force according to a position change of a magnet described later in FIGS. 4A to 4C , and the magnetic sensor may sense external magnetic force (eg, geomagnetism).
- the interface 177 may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device 101 to an external electronic device (eg, the electronic device 102).
- the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.
- HDMI high definition multimedia interface
- USB universal serial bus
- SD card interface Secure Digital Card interface
- audio interface audio interface
- connection terminal 178 may include a connector through which the electronic device 101 may be physically connected to an external electronic device (eg, the electronic device 102).
- the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).
- the haptic module 179 may convert electrical signals into mechanical stimuli (eg, vibration or motion) or electrical stimuli that a user may perceive through tactile or kinesthetic senses.
- the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.
- the camera module 180 may capture still images and moving images. According to one embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.
- the power management module 188 may manage power supplied to the electronic device 101 .
- the power management module 188 may be implemented as at least part of a power management integrated circuit (PMIC), for example.
- PMIC power management integrated circuit
- the battery 189 may supply power to at least one component of the electronic device 101 .
- the battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.
- the communication module 190 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, the electronic device 102, the electronic device 104, or the server 108). Establishment and communication through the established communication channel may be supported.
- the communication module 190 may include one or more communication processors that operate independently of the processor 120 (eg, an application processor) and support direct (eg, wired) communication or wireless communication.
- the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg, : a local area network (LAN) communication module or a power line communication module).
- a wireless communication module 192 eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module
- GNSS global navigation satellite system
- wired communication module 194 eg, : a local area network (LAN) communication module or a power line communication module.
- a corresponding communication module is a first network 198 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 199 (eg, legacy It may communicate with the external electronic device 104 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a telecommunications network such as a computer network (eg, a LAN or a WAN).
- a telecommunications network such as a computer network (eg, a LAN or a WAN).
- These various types of communication modules may be integrated as one component (eg, a single chip) or implemented as a plurality of separate components (eg, multiple chips).
- the wireless communication module 192 uses subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199.
- subscriber information eg, International Mobile Subscriber Identifier (IMSI)
- IMSI International Mobile Subscriber Identifier
- the electronic device 101 may be identified or authenticated.
- the wireless communication module 192 may support a 5G network after a 4G network and a next-generation communication technology, for example, NR access technology (new radio access technology).
- NR access technologies include high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and access of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low latency (URLLC)).
- eMBB enhanced mobile broadband
- mMTC massive machine type communications
- URLLC ultra-reliable and low latency
- -latency communications can be supported.
- the wireless communication module 192 may support a high frequency band (eg, mmWave band) to achieve a high data rate, for example.
- the wireless communication module 192 uses various technologies for securing performance in a high frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), and full-dimensional multiplexing. Technologies such as input/output (FD-MIMO: full dimensional MIMO), array antenna, analog beam-forming, or large scale antenna may be supported.
- the wireless communication module 192 may support various requirements defined for the electronic device 101, an external electronic device (eg, the electronic device 104), or a network system (eg, the second network 199).
- the wireless communication module 192 is a peak data rate for eMBB realization (eg, 20 Gbps or more), a loss coverage for mMTC realization (eg, 164 dB or less), or a U-plane latency for URLLC realization (eg, Example: downlink (DL) and uplink (UL) each of 0.5 ms or less, or round trip 1 ms or less) may be supported.
- eMBB peak data rate for eMBB realization
- a loss coverage for mMTC realization eg, 164 dB or less
- U-plane latency for URLLC realization eg, Example: downlink (DL) and uplink (UL) each of 0.5 ms or less, or round trip 1 ms or less
- the antenna module 197 may transmit or receive signals or power to the outside (eg, an external electronic device).
- the antenna module 197 may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (eg, PCB).
- the antenna module 197 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is selected from the plurality of antennas by the communication module 190, for example. can be chosen A signal or power may be transmitted or received between the communication module 190 and an external electronic device through the selected at least one antenna.
- other components eg, a radio frequency integrated circuit (RFIC) may be additionally formed as a part of the antenna module 197 in addition to the radiator.
- RFIC radio frequency integrated circuit
- the antenna module 197 may form a mmWave antenna module.
- the mmWave antenna module includes a printed circuit board, an RFIC disposed on or adjacent to a first surface (eg, a lower surface) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, array antennas) disposed on or adjacent to a second surface (eg, a top surface or a side surface) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.
- peripheral devices eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)
- signal e.g. commands or data
- commands or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199 .
- Each of the external electronic devices 102 or 104 may be the same as or different from the electronic device 101 .
- all or part of operations executed in the electronic device 101 may be executed in one or more external electronic devices among the external electronic devices 102 , 104 , or 108 .
- the electronic device 101 when the electronic device 101 needs to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device 101 instead of executing the function or service by itself.
- one or more external electronic devices may be requested to perform the function or at least part of the service.
- One or more external electronic devices receiving the request may execute at least a part of the requested function or service or an additional function or service related to the request, and deliver the execution result to the electronic device 101 .
- the electronic device 101 may provide the result as at least part of a response to the request as it is or additionally processed.
- cloud computing distributed computing, mobile edge computing (MEC), or client-server computing technology may be used.
- the electronic device 101 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing.
- the external electronic device 104 may include an internet of things (IoT) device.
- Server 108 may be an intelligent server using machine learning and/or neural networks. According to one embodiment, the external electronic device 104 or server 108 may be included in the second network 199 .
- the electronic device 101 may be applied to intelligent services (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.
- an electronic device 200 (eg, the electronic device 101 of FIG. 1 ) according to an embodiment has a first side (or front side) 210A and a second side (or back side). 210B, and a housing 210 including a side surface 210C surrounding a space between the first surface 210A and the second surface 210B, and connected to at least a part of the housing 210, and the electronic
- the apparatus 200 may include attachment members 250 and 260 configured to detachably attach the device 200 to a part of the user's body (eg, a wrist or an ankle).
- the housing may refer to a structure including some of the first face 210A, the second face 210B, and the side face 210C of FIGS. 2A and 2B.
- the first surface 210A may be formed by a front plate 201 (eg, a glass plate or a polymer plate including various coating layers) that is substantially transparent at least in part.
- the second face 210B may be formed by the substantially opaque back plate 207 .
- the rear plate 207 is formed, for example, of coated or tinted glass, ceramic, polymer, metal (eg, aluminum, stainless steel (STS), or magnesium), or a combination of at least two of the foregoing. It can be.
- the side surface 210C is coupled to the front plate 201 and the rear plate 207 and is formed by a side bezel structure (or “side member” or “bezel part”) 206 including metal and/or polymer. can be formed
- the back plate 207 and the side bezel structure 206 may be integrally formed and include the same material (eg, a metal material such as aluminum).
- the binding members 250 and 260 may be formed of various materials and shapes.
- the binding members 250 and 260 may be made of woven material, leather, rubber, urethane, metal, ceramic, or a combination of at least two of the above materials, and a plurality of unit links formed to flow with each other Alternatively, it may be implemented integrally.
- the electronic device 200 includes a display 220 (see FIG. 3), audio modules 205 and 208, sensor modules 211, key input devices 202, 203 and 204, and connector holes ( 209) may include at least one or more. In some embodiments, the electronic device 200 omits at least one of the components (eg, the key input devices 202, 203, 204, the connector hole 209, or the sensor module 211) or has other components. Additional elements may be included.
- the display 220 may be visually exposed, for example, through a substantial portion of the front plate 201 .
- the shape of the display 220 may be a shape corresponding to the shape of the front plate 201, and may have various shapes such as a circular shape, an oval shape, or a polygonal shape.
- the display 220 may be coupled to or disposed adjacent to a touch sensing circuit, a pressure sensor capable of measuring the intensity (pressure) of a touch from a user, and/or a fingerprint sensor.
- the audio modules 205 and 208 may include a microphone hole 205 and a speaker hole 208 .
- a microphone for acquiring external sound may be disposed inside the microphone hole 205, and in some embodiments, a plurality of microphones may be disposed to detect the directionality of sound.
- the speaker hole 208 can be used as an external speaker and a receiver for a call.
- the speaker hole 208 and the microphone hole 205 may be implemented as one hole, or a speaker may be included in the electronic device 200 without the speaker hole 208 (eg, a piezo speaker).
- the sensor module 211 may generate an electrical signal or data value corresponding to an internal operating state of the electronic device 200 or an external environmental state.
- the sensor module 211 may include, for example, a biometric sensor module 211 (eg, an HRM sensor) disposed on the second surface 210B of the housing 210 .
- the electronic device 200 includes a sensor module not shown, for example, an optical sensor, a motion sensor (eg, a gyro sensor, an acceleration sensor, a speed sensor, etc.), a gesture sensor, an air pressure sensor, a magnetic sensor, a grip sensor, At least one of a color sensor, an infrared (IR) sensor, a biosensor, a temperature sensor, a humidity sensor, or an illuminance sensor may be further included.
- IR infrared
- the sensor module 211 may include electrode regions 213 and 214 forming a part of the surface of the electronic device 200 and a biosignal detection circuit (not shown) electrically connected to the electrode regions 213 and 214. have.
- the electrode regions 213 and 214 may include a first electrode region 213 and a second electrode region 214 disposed on the second surface 210B of the housing 210 .
- the sensor module 211 may be configured such that the electrode areas 213 and 214 obtain an electrical signal from a part of the user's body, and the biosignal detection circuit detects the user's biometric information based on the electrical signal.
- the key input devices 202, 203, and 204 include a wheel key 202 disposed on a first surface 210A of the housing 210 and rotatable in at least one direction, and/or a side surface 210C of the housing 210. ) may include side key buttons 203 and 204 disposed on.
- the shape of the wheel key 202 may correspond to the shape of the front plate 201 .
- the electronic device 200 may not include some or all of the above-mentioned key input devices 202, 203, and 204, and the key input devices 202, 203, and 204 that are not included may display 220 may be implemented in other forms such as soft keys.
- the connector hole 209 may accommodate a connector (eg, a USB connector) for transmitting and receiving power and/or data to and from an external electronic device and a connector for transmitting and receiving an audio signal to and from an external electronic device.
- a connector eg, a USB connector
- Other connector holes may be included.
- the electronic device 200 may further include, for example, a connector cover (not shown) that covers at least a portion of the connector hole 209 and blocks external foreign substances from entering the connector hole.
- the binding members 250 and 260 may be detachably attached to at least a partial region of the housing 210 using the locking members 251 and 261 .
- the fastening members 250 and 260 may include one or more of a fixing member 252 , a fixing member fastening hole 253 , a band guide member 254 , and a band fixing ring 255 .
- the fixing member 252 may be configured to fix the housing 210 and the fastening members 250 and 260 to a part of the user's body (eg, wrist, ankle, etc.).
- the fixing member fastening hole 253 corresponds to the fixing member 252 to fix the housing 210 and the fastening members 250 and 260 to a part of the user's body.
- the band guide member 254 is configured to limit the movement range of the fixing member 252 when the fixing member 252 is fastened to the fixing member fastening hole 253, so that the fastening members 250 and 260 are attached to a part of the user's body. It can be tightly bonded.
- the band fixing ring 255 may limit the movement range of the fastening members 250 and 260 in a state in which the fixing member 252 and the fixing member fastening hole 253 are fastened.
- an electronic device 300 (eg, the electronic device 101 of FIG. 1 or the electronic device 200 of FIG. 2 ) includes a side bezel structure (or “bezel part”) 310, a wheel key ( “or rotating body”) 320, front plate 201, display 220, first antenna 350, second antenna 355, support member 360 (eg bracket), A battery 370 , a printed circuit board 380 , a sealing member 390 , a back plate 393 , and coupling members 395 and 397 may be included. At least one of the components of the electronic device 300 may be the same as or similar to at least one of the components of the electronic device 101 of FIG. 1 or the electronic device 200 of FIG. 2 , and overlapping descriptions may be made.
- the support member 360 may be disposed inside the electronic device 300 and connected to the side bezel structure 310 or integrally formed with the side bezel structure 310 .
- the support member 360 may be formed of, for example, a metal material and/or a non-metal (eg, polymer) material.
- the support member 360 may have the display 220 coupled to one surface and the printed circuit board 380 coupled to the other surface.
- a processor, memory, and/or interface may be mounted on the printed circuit board 380 .
- a processor is a microprocessor, or one or more general-purpose processors (eg, ARM-based processors), digital signal processors (DSPs), programmable logic devices (PLDs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), It may include any suitable type of processing circuitry, such as a graphical processing unit (GPU), video card controller, and the like.
- general purpose computer accesses code for implementing the processing described herein, execution of the code may be perceived as transforming the general purpose computer into a special purpose computer for executing the processing described herein.
- Certain functions and steps presented in the figures may be implemented in hardware, software, or a combination of both and may be performed wholly or in part within the programmed instructions of a computer. No claim element herein is to be construed as a functional claim unless explicitly recited using the phrase "means for”. Additionally, those skilled in the art can understand and appreciate that a "processor” or “microprocessor” may be hardware in the claimed disclosure
- Memory may include, for example, volatile memory or non-volatile memory.
- the interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, and/or an audio interface.
- HDMI high definition multimedia interface
- USB universal serial bus
- the interface may electrically or physically connect the electronic device 300 to an external electronic device, and may include a USB connector, an SD card/MMC connector, or an audio connector.
- the battery 370 is a device for supplying power to at least one component of the electronic device 300, and may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. have. At least a portion of the battery 370 may be disposed on substantially the same plane as the printed circuit board 380 , for example.
- the battery 370 may be integrally disposed inside the electronic device 200 or may be disposed detachably from the electronic device 200 .
- the first antenna 350 may be disposed between the display 220 and the support member 360 .
- the first antenna 350 may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna.
- the first antenna 350 may, for example, perform short-range communication with an external device, wirelessly transmit/receive power required for charging, and transmit a short-range communication signal or a magnetic-based signal including payment data.
- the antenna structure of the first antenna 350 may be implemented by a part of the side bezel structure 310 and/or the support member 360 or a combination thereof.
- the second antenna 355 may be disposed between the printed circuit board 380 and the rear plate 393 .
- the second antenna 355 may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna.
- the second antenna 355 may, for example, perform short-range communication with an external device, wirelessly transmit/receive power required for charging, and transmit a short-range communication signal or a magnetic-based signal including payment data.
- the antenna structure of the second antenna 355 may be implemented by a part of the side bezel structure 310 and/or the back plate 393 or a combination thereof.
- the sealing member 390 may be positioned between the side bezel structure 310 and the rear plate 393 .
- the sealing member 390 may be configured to block moisture and foreign substances from entering into the inner space of the electronic device 300 surrounded by the side bezel structure 310 and the back plate 393 from the outside.
- Electronic devices may be devices of various types.
- the electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance.
- a portable communication device eg, a smart phone
- a computer device e.g., a smart phone
- a portable multimedia device e.g., a portable medical device
- a camera e.g., a portable medical device
- a camera e.g., a portable medical device
- a camera e.g., a portable medical device
- a camera e.g., a camera
- a wearable device e.g., a smart bracelet
- first, second, or first or secondary may simply be used to distinguish a given component from other corresponding components, and may be used to refer to a given component in another aspect (eg, importance or order) is not limited.
- a (e.g., first) component is said to be “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.”
- the certain component may be connected to the other component directly (eg by wire), wirelessly, or through a third component.
- module used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logical blocks, parts, or circuits.
- a module may be an integrally constructed component or a minimal unit of components or a portion thereof that performs one or more functions.
- the module may be implemented in the form of an application-specific integrated circuit (ASIC).
- ASIC application-specific integrated circuit
- a storage medium eg, internal memory 136 or external memory 138
- a machine eg, electronic device 101
- a processor eg, the processor 120
- a device eg, the electronic device 101
- the one or more instructions may include code generated by a compiler or code executable by an interpreter.
- the device-readable storage medium may be provided in the form of a non-transitory storage medium.
- the storage medium is a tangible device and does not contain a signal (e.g. electromagnetic wave), and this term refers to the case where data is stored semi-permanently in the storage medium. It does not discriminate when it is temporarily stored.
- a signal e.g. electromagnetic wave
- the method according to various embodiments disclosed in this document may be included and provided in a computer program product.
- Computer program products may be traded between sellers and buyers as commodities.
- a computer program product is distributed in the form of a device-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or through an application store (e.g. Play StoreTM) or on two user devices (e.g. It can be distributed (eg downloaded or uploaded) online, directly between smart phones.
- a device-readable storage medium e.g. compact disc read only memory (CD-ROM)
- an application store e.g. Play StoreTM
- two user devices e.g. It can be distributed (eg downloaded or uploaded) online, directly between smart phones.
- at least part of the computer program product may be temporarily stored or temporarily created in a device-readable storage medium such as a manufacturer's server, an application store server, or a relay server's memory.
- each component (eg, module or program) of the above-described components may include a single object or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. have.
- one or more components or operations among the aforementioned corresponding components may be omitted, or one or more other components or operations may be added.
- a plurality of components eg modules or programs
- the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by a corresponding component of the plurality of components prior to the integration. .
- the actions performed by a module, program, or other component are executed sequentially, in parallel, iteratively, or heuristically, or one or more of the actions are executed in a different order, or omitted. or one or more other actions may be added.
- 4A to 4C are diagrams illustrating arrangement of a pair of Hall sensors and a magnetic sensor in an electronic device according to an exemplary embodiment.
- FIG. 4A is a top view 400a of an electronic device (eg, the electronic device 101 of FIG. 1 , the electronic device 200 of FIG. 2 , and the electronic device 300 of FIG. 3 ), and FIG. 4B is a side view.
- a side view 400b, FIG. 4C shows a perspective view 400c.
- a bezel part 450 , a rotating body 410 , a pair of Hall sensors 431 and 432 , and a magnetic sensor 440 among components of the electronic device will be mainly described.
- At least one of the components of the electronic device may be the same as or similar to at least one of the components of the electronic device 101 of FIG. 1 , the electronic device 200 of FIG. 2 , or the electronic device 300 and , overlapping descriptions are omitted below.
- the rotating body 410 (eg, the wheel key 320 of FIG. 3 ) may be rotatably coupled to the bezel part 450 of the electronic device with respect to the rotating shaft 490 .
- the rotating body 410 may be rotatable in a clockwise or counterclockwise direction with respect to the rotating shaft 490 .
- the axis of rotation 490 is shown as the z-axis.
- the rotating body 410 may have a ring shape following a circumference based on the rotating shaft 490 .
- a display (eg, the display 220 of FIG. 3 ) may be disposed and exposed through an area within the circumference of the ring-shaped rotating body 410 .
- the rotating body 410 may include a plurality of magnets 420 .
- the plurality of magnets 420 may be disposed along the ring shape of the rotating body 410 .
- the plurality of magnets 420 may be spaced apart from each other by the same distance along a circumference corresponding to the ring shape of the rotating body 410 .
- a plurality of magnets 420 may be disposed along the circumference with an axis of rotation 490 coinciding with the center of the circumference.
- an example of eight magnets 420 is mainly described.
- the number of the plurality of magnets 420 is not limited to the above description.
- the number of magnets 420 is n, and n may be an integer of 2 or greater.
- the number of the plurality of magnets 420 may be eight.
- An angle formed between the magnets 420 adjacent to each other with respect to the rotation axis 490 may be 45 degrees.
- an angle between straight lines 482 from two magnets 420 adjacent to each other among the plurality of magnets 420 toward the rotation axis 490 may be 45 degrees.
- an angle formed between magnets 420 adjacent to each other with respect to the rotating shaft 490 may be 360/n degrees.
- the angle formed between the two components based on the axis of rotation 490 is one plane that includes the axis of rotation 490 and one component and the other plane that includes the axis of rotation 490 and another component. It can represent the angle formed between them.
- the angle formed between the first component and the second component based on the rotation axis 490 is an imaginary first straight line (eg, the rotation axis 490) from the rotation axis 490 toward the first component. It may be an angle between a vertical line) and an imaginary second straight line (eg, a vertical line perpendicular to the rotation axis 490) toward the second component from the rotation axis 490 .
- the angle formed between the two components based on the axis of rotation 490 is, when viewed in a direction perpendicular to the plane corresponding to the axis of rotation 410, from the axis of rotation 490 to the components in that plane. It may be an angle between straight lines facing each other.
- a plurality of magnets 420 may be accommodated in the rotating body 410 . However, it is not limited thereto, and for example, the plurality of magnets 420 are attached to one surface (eg, the surface facing the bezel part 450 or the opposite surface) of the rotating body 410 and/or may also be fitted.
- the pair of Hall sensors 431 and 432 may sense a magnetic field generated by the plurality of magnets 420 .
- the pair of Hall sensors 431 and 432 may generate a signal (eg, a voltage signal) corresponding to a changing magnetic field according to a Hall effect. This signal can be referred to as magnetic field data.
- the pair of hall sensors 431 and 432 may sense a change in magnetic field strength caused by movement of the plurality of magnets 420 when the rotating body 410 is rotated.
- magnetic field data indicating a magnetic field sensed by each of the pair of Hall sensors 431 and 432 may be referred to as first magnetic field data.
- the pair of hall sensors 431 and 432 may be disposed within the bezel part 450 and sense a magnetic field generated by the magnetic force of the plurality of magnets 420 .
- the processor of the electronic device may generate first magnetic field data indicating the magnetic field strength value sensed by each Hall sensor based on the magnetic field sensing of each of the pair of Hall sensors 431 and 432 .
- the first magnetic field data may mainly consider or include magnetic field components (eg, internal magnetic field components) that are data generated by magnets (eg, the plurality of magnets 420) disposed in the electronic device.
- the first magnetic field data may include a magnetic field component (eg, an external magnetic field component) that is data caused by an external factor (eg, geomagnetism) in addition to a magnetic field component generated by a magnet disposed in the electronic device.
- the first magnetic field data includes a composite value of the above-described internal magnetic field component and external magnetic field component, and in the first magnetic field data, the magnetic field component due to the magnet disposed in the electronic device is greater than the magnetic field component caused by the external factor ( magnitude).
- an angle formed between the hall sensors 431 and 432 based on the axis of rotation 490 is formed between two magnets 420 adjacent to each other among the plurality of magnets 420 based on the axis of rotation 490.
- angle may be smaller than
- an angle between two imaginary vertical lines 483 directed from the axis of rotation 490 to each hall sensor is directed from the axis of rotation 490 to two magnets 420 adjacent to each other among the plurality of magnets 420.
- a pair of Hall sensors 431 and 432 may be disposed at a smaller angle than the angle between the vertical lines 482 of .
- the axis of rotation 490 When viewed in a direction perpendicular to the plane corresponding to the rotating body 410 (for example, the rotation axis 490), the axis of rotation 490 from points corresponding to the pair of Hall sensors 431 and 432 in the plane.
- the angle (for example, 22.5 degrees) between the imaginary straight lines 483 directed toward each other is the angle (eg, 45 degrees) between the two imaginary straight lines 482 directed toward the rotational axis 490 from the two magnets 420 adjacent to each other.
- a processor may estimate a rotation change amount (eg, a rotation angle) of the rotating body 410 based on a magnetic force change pattern described later in FIG. 6 .
- the magnetic sensor 440 may sense a magnetic field.
- the magnetic sensor 440 may be disposed in an inner space 470 defined within the circumference of the rotating body 410 .
- the magnetic sensor 440 may be disposed in the space 471 between the pair of Hall sensors 431 and 432 and the rotation shaft 490 among the internal spaces.
- the magnetic sensor 440 is disposed in a region 472 different from the region where the internal magnet 460 is disposed in the space 471 defined between the pair of Hall sensors 431 and 432 and the rotating shaft 490. It can be.
- the inner magnet 460 is shown to be disposed in a central region including the rotation shaft 490 (eg, a region surrounded by the circumference of the rotation body 410 ).
- Internal magnet 460 is illustratively centered between a back plate (eg, back plate 393 in FIG. 3 ) and a printed circuit board (eg, printed circuit board 380 in FIG. 3 ) corresponding to axis of rotation 490 . It may be placed in the area, but is not limited thereto. Since the magnetic sensor 440 is disposed in the region 472 outside the region where the internal magnet 460 is located, the influence of the internal magnet 460 on the magnetic sensor 440 can be reduced.
- the processor of the electronic device may generate second magnetic field data indicating the magnetic field strength value sensed by the magnetic sensor 440 through magnetic field sensing of the magnetic sensor 440 .
- the second magnetic field data may include a magnetic field component (eg, an external magnetic field component) caused by an external magnetic field (eg, geomagnetism).
- the second magnetic field data includes values in which the above-mentioned internal magnetic field component and external magnetic field component are mixed. The magnetic field component due to can be more emphasized.
- the second magnetic field data may include magnetic field strength values for other axes.
- the second magnetic field data may include geomagnetism values indicating geomagnetism strength sensed along three axes (eg, an x-axis, a y-axis, and a z-axis).
- the processor generates magnets 420 (eg, a plurality of magnets 420 and an internal magnet 460) included in the electronic device from raw data generated by sensing of the magnetic sensor 440. )), it is possible to generate the second magnetic field data by performing a correction to remove the influence by.
- the magnetic sensor 440 may be disposed on a printed circuit board.
- the distance of each of the pair of Hall sensors 431 and 432 from the magnetic sensor 440 may be the same.
- an imaginary straight line 484 from the magnetic sensor 440 toward the rotating shaft 490 is the rotating shaft ( 490) may bisect an angle between imaginary straight lines 483.
- the location of the magnetic sensor 440 is not limited thereto.
- the magnetic sensor 440 may be disposed spaced apart from the plane 419 on which the plurality of magnets 420 are disposed in the rotating body 410 . As shown in FIGS. 4A to 4C , the magnetic sensor 440 may be disposed under a plane 419 on which the plurality of magnets 420 are disposed among the bezel part 450 .
- the pair of hall sensors 431 and 432 and the magnetic sensor 440 may be sensors that measure a magnetic field.
- the measurement resolution of the pair of Hall sensors 431 and 432 may be smaller than that of the magnetic sensor 440 .
- the higher the measurement resolution the more precise measurement capability can be exhibited.
- the measurable magnetic force range of the pair of Hall sensors 431 and 432 may be wider than the measurable magnetic force range of the magnetic sensor 440 .
- the pair of Hall sensors 431 and 432 can coarsely sense a wide range with low resolution, and the magnetic sensor 440 can precisely sense a narrow range with high resolution.
- a processor (eg, the processor 120 of FIG. 1 ) may be electrically connected to the pair of Hall sensors 431 and 432 and the magnetic sensor 440 .
- the processor may correct the second magnetic field data generated through the sensing of the magnetic sensor 440 based on the first magnetic field data.
- the operation of the processor will be described in detail with reference to FIGS. 5 to 11 below.
- a memory (eg, the memory 130 of FIG. 1 ) may be electrically connected to the aforementioned processor.
- the processor and memory may be disposed on a printed circuit board coupled to and/or connected to the bezel part 450 (eg, the side bezel structure 310 of FIG. 3 ).
- FIG. 5 is a flowchart illustrating a method of correcting magnetic field data according to an exemplary embodiment.
- the electronic device (eg, the electronic device 101 of FIG. 1 , the electronic device 200 of FIG. 2 , and the electronic device 300 of FIG. 3 ) generates first magnetic field data through sensing of a Hall sensor. can do.
- a magnetic field is sensed by a pair of Hall sensors (eg, a pair of Hall sensors 431 and 432 of FIGS. 4A to 4C) disposed on a bezel part of an electronic device, and the electronic device is connected to a bezel.
- a plurality of magnets (eg, magnets 420 of FIGS. 4A to 4C) included in a rotating body (eg, the rotating body 410 of FIGS. 4A to 4C) rotatably coupled to the part about a rotational axis ), it is possible to generate the first magnetic field data caused by.
- the electronic device may determine whether the rotating body has rotated. According to an embodiment, the electronic device may perform a correction operation to be described later whenever rotation of the rotating body occurs. For example, the electronic device may determine whether or not the rotating body rotates based on the position of the rotating body at a point in time at which a previous correction operation was performed (eg, a previous correction point). While monitoring the first magnetic field data according to operation 510, the electronic device may detect a change in the internal magnetic field caused by rotation of the rotating body. The electronic device may determine that the rotating body has rotated in response to a change in the first magnetic field data based on the sensing of the pair of Hall sensors.
- the electronic device may refrain from correcting sensing data of a magnetic sensor (eg, the magnetic sensor 440 of FIGS. 4A to 4C ) until rotation of the rotating body is detected.
- the electronic device may initiate correction of the second magnetic field data of the magnetic sensor in response to detecting rotation of the rotating body.
- the electronic device may generate second magnetic field data through sensing of the magnetic sensor.
- the electronic device may generate the second magnetic field data through sensing of a magnetic sensor disposed in an inner space defined by an inner circumference of the rotating body.
- the processor of the electronic device may generate second magnetic field data by applying a correction coefficient described later in FIG. 7 to raw data generated through the magnetic sensor.
- the electronic device may estimate the amount of change in rotation of the rotating body.
- the electronic device determines the target angular position (e.g., the current viewpoint) from the previous angular position at the previous calibration time point based on the magnetic change pattern in the first magnetic field data caused by the rotation of the rotating body.
- a rotation angular displacement changed to a target angular position may be estimated as a rotation change amount.
- the processor of the electronic device may generate magnetic field difference data that is a difference between the first magnetic field data collected from the pair of Hall sensors, and may estimate a rotation variation based on the magnetic field difference data and the magnetic change pattern. Estimation of the amount of change in rotation is described in FIG. 6 below.
- the electronic device may calculate a compensated offset value based on the amount of rotation change of the rotating body and the first magnetic field data.
- the magnetic field offset value may indicate an offset value for removing a component other than a geomagnetic component from the second magnetic field data.
- the compensated offset value is an offset value generated by compensating for the magnetic field offset value, and may be more accurate than the magnetic field offset value. Calculation of the offset value is described in FIGS. 8 and 9 below.
- the electronic device may correct the second magnetic field data using the compensated offset value. For example, the electronic device may calculate the corrected second magnetic field data by applying (eg, adding or subtracting) a compensated offset value to the second magnetic field data. The electronic device may determine an azimuth (eg, magnetic north azimuth) using the corrected second magnetic field data. For example, the electronic device may output the determined azimuth to a display (eg, the display module 160 of FIG. 1 ).
- a display eg, the display module 160 of FIG. 1 .
- FIG. 6 is a diagram illustrating an example of first magnetic field data collected by a pair of Hall sensors according to an exemplary embodiment.
- An electronic device may estimate the amount of change in rotation of the rotating body as described above in operation 540 of FIG. 5 .
- the electronic device may be configured as a rotating body (eg, a pair of Hall sensors 431 and 432 of FIGS. 4A to 4C ) based on a magnetic difference pattern 600 collected from a pair of Hall sensors. : It is possible to determine the amount of change in rotation of the rotating body 410 of FIGS. 4A to 4C.
- a pair of Hall sensors eg, a first Hall sensor and a second Hall sensor
- the rotating body rotates through the entire rotation range (eg, 0 degree to 360 degrees).
- a curve of difference values of the first magnetic field data generated through sensing of the sensor may be shown.
- the difference value of the first magnetic field data is the difference between the first magnetic field data generated through sensing of the first Hall sensor and the first magnetic field data generated through sensing of the second Hall sensor, and may also be referred to as magnetic field difference data.
- the magnetic force difference pattern 600 may include curves 631 , 632 , and 633 of magnetic field difference values sensed on each axis (eg, an x-axis, a y-axis, and a z-axis).
- the entire rotation range (eg, 360 degrees) of the rotating body may be divided according to the number of a plurality of magnets (eg, the magnets 420 of FIGS. 4A to 4C).
- the rotation interval may represent an angular interval obtained by dividing the entire rotation range by the number of magnets.
- the magnets of the plurality of magnets are equally spaced on the circumference of the rotating body, the rotation intervals are equal to each other, and the total rotation range is obtained by equally dividing the total rotation range by the number of the plurality of magnets. It can be.
- the entire rotating range can be divided into 8 rotating sections.
- the entire rotation range may be divided into a first rotation section to an eighth rotation section.
- the first rotation section is an angular section from 0 degrees to 45 degrees based on the reference angular position
- the second rotation section is an angular section from 45 degrees to 90 degrees
- the third rotation section is from 90 degrees based on the reference angular position
- the fourth rotation section is an angle section from 135 degrees to 180 degrees
- the fifth rotation section is an angle section from 180 degrees to 225 degrees
- the sixth rotation section is an angle section from 225 degrees to 270 degrees
- the section, the seventh rotation section may indicate an angular section from 270 degrees to 315 degrees
- the eighth rotation section may indicate an angular section from 315 degrees to 360 degrees.
- the angular range corresponding to one rotation section may be an angle formed between two magnets adjacent to each other.
- magnetic field strength values obtained from each of the pair of Hall sensors may change.
- the difference between the magnetic field strength values may also change according to the rotation of the rotating body.
- the difference data representing the difference between magnetic field strength values may repeatedly indicate the same or similar pattern whenever the rotating body rotates by an angular range (eg, 45 degrees) corresponding to one rotation section. For example, in FIGS.
- the number of the plurality of magnets is 8, and the distance between two adjacent magnets is 45 degrees, so the magnetic field difference in each axis (eg, x-axis, y-axis, z-axis)
- the pattern of changing the value can be repeated every time the rotating body rotates 45 degrees.
- Peaks of the curve 633 of difference values may appear at angular positions identical to or similar to angular positions at which peaks appear in other rotation sections.
- the angular position of the peak has been described as an example of a pattern for each rotation section of the magnetic field difference data, the pattern is not limited thereto.
- the electronic device may determine an angular displacement relative to a previous correction point based on the magnetic force difference pattern 600 .
- the electronic device may determine the angular displacement compared to the previous correction point by using the magnetic force difference pattern 600 for a partial rotation period (eg, one rotation period from 0 degree to 45 degrees). For example, the electronic device rotates from the previous calibration time point to the target time point based on the angular position recorded at the previous calibration time point (eg, the previous angular position), the magnetic force difference pattern 600, and the magnetic field difference data generated at the target time point.
- the electronic device may refer to the magnetic force difference pattern 600 to convert the magnetic field difference data into a rotational angular displacement in which the rotating body is rotated relative to a previous correction point.
- the electronic device may determine the final angular position based on the previous angular position and the converted rotational angular displacement. For example, the electronic device may accumulate the converted rotational angular displacement at the previous angular position by referring to the magnetic force difference pattern 600 from the magnetic field difference data detected after the previous calibration point. The electronic device may determine the final angular position by adding the accumulated rotational angular displacement to the transfer angular position. Also, the electronic device may accumulate angle changes up to an angle range corresponding to one rotation section. The electronic device may initialize the accumulation of angular displacements when the sum of the angular position at the time of previous calibration and the angular displacement accumulated from the time of previous calibration to the target time is out of the angular range corresponding to the rotation section.
- the electronic device may accumulate and add (or subtract) the angular displacement again based on the angular range of the adjacent rotation section. For example, when the rotating body rotates from 30 degrees at the time of previous correction to 60 degrees at the time of target correction, the electronic device accumulates and calculates the amount of rotation change from 30 degrees to 45 degrees belonging to the first rotation section, and It can be ignored by resetting the previously accumulated rotation change amount from the point at which .
- the electronic device may calculate the final angular position of 60 degrees by adding the rotational displacement from 45 degrees to 60 degrees to 45 degrees, which is the boundary value of the second rotation section, from the point at which 45 degrees belonging to the second rotation section is reached. Since the magnetic force difference pattern 600 appearing in each rotation section is the same as or similar to the magnetic force difference pattern 600 in other rotation sections, the electronic device may reset rotational displacement accumulation in units of rotation sections as described above.
- the magnetic force difference pattern 600 shown in FIG. 6 is a pattern in which there is a deviation between the magnetic forces of a plurality of magnets, and the peak value appears slightly different due to the magnetic force deviation of the individual magnets in the pattern repeated every 45 degrees. can Assuming that the magnetic deviation of each magnet is zero, a pattern of exactly the same shape and size can be repeated every 45 degrees.
- FIG. 7 is a diagram illustrating acquisition of second magnetic field data collected by a magnetic sensor according to an exemplary embodiment.
- a magnetic sensor (eg, magnetic sensor 440 of FIGS. 4A to 4C ) of an electronic device may measure external magnetic force.
- the magnetic sensor may, for example, measure the geomagnetism in three axes (eg, x-axis, y-axis, z-axis) and output a geomagnetism value corresponding to each of the three axes, and the electronic device may measure the geomagnetism measured by the magnetic sensor
- the values can be used to determine the direction of magnetic north on a map.
- a trajectory of an azimuth eg, magnetic north azimuth
- Distortion may occur in the magnetic field sensed by the magnetic sensor depending on the internal arrangement structure of the electronic device (eg, the position of the magnets of the center magnet and rotating body).
- An error may occur when calculating an azimuth (eg, magnetic north azimuth) due to distortion included in a geomagnetic value sensed and output through a magnetic sensor.
- an azimuthal trajectory 710 calculated based on raw data 742 of the magnetic sensor and having the above-described error may appear as an ellipse as shown.
- the raw data 742 are magnetic values for three axes generated through a magnetic sensor, and may include data before correction.
- a processor (for example, the processor 120) of the electronic device obtains the second magnetic field data 741 by applying a correction coefficient to raw data 742 generated through the magnetic sensor.
- the correction coefficient may be expressed as a 3 ⁇ 3 vector 790 as shown in FIG. 7 .
- the electronic device may obtain the second magnetic field data 741 by multiplying the raw data 742 by a correction coefficient.
- An azimuthal trajectory 720 calculated based on the second magnetic field data 741 may appear circular as shown.
- the circular azimuth trajectory 720 represents a decrease in distortion in the second magnetic field data 741, and the electronic device can calculate the azimuth with a reduced error using the second magnetic field data 741.
- FIG. 8 is a flowchart illustrating an offset compensation operation for correcting second magnetic field data according to an exemplary embodiment.
- the electronic device may determine an offset corresponding to the angular position of the target viewpoint by using reference tables.
- the angular position of the target viewpoint may be a position obtained by adding (or subtracting) an angular displacement accumulated from the angular position of a previous viewpoint in response to a rotational change amount of the rotating body.
- the reference tables may be prepared for only one angular range unit due to the characteristic that the magnetic force difference pattern is repeated for each angular range unit of each rotation section.
- the reference table may be generated in advance through simulation assuming typical values 910 of a plurality of magnets disposed on the rotating body. Errors due to magnetic force deviations of the arranged magnets are not considered in the reference table, and this error can be compensated for through an operation described later.
- the electronic device calculates a magnetic force error according to a magnetic force deviation 900 from a Hall reference value and magnetic field difference data extracted corresponding to an angular position (or a rotation change amount) from a Hall sensor reference table.
- the electronic device may extract a Hall reference value corresponding to the angular position of the rotating body from the Hall sensor reference table.
- the Hall sensor reference table may indicate values generated through Hall sensors by a magnet having a magnetic force deviation 900 of 0% at an angular position determined with respect to a target viewpoint, and may be exemplarily generated as shown in Table 1 below. have.
- the data format of the hall sensor reference table is not limited to Table 1 below.
- Table 1 above is an arbitrary angular position within the angular range corresponding to one rotation section unit.
- the hall reference values corresponding to the hall reference value for the x-axis , the Hall reference value for the y-axis , the Hall reference value for the z-axis can include angular position 0 degrees to 45 degrees are shown as an example of , but the angle is not limited to an integer, and may be a real number depending on the implementation method of the reference table.
- the unit of the magnetic force difference value of the Hall sensor reference table is (micro tesla). In addition, the unit may be substituted with radians instead of degrees.
- the electronic device may generate magnetic field difference data as shown in Equation 1 below, based on the first magnetic field data generated in operation 510 described above.
- the magnetic field difference data may indicate a difference between the first magnetic field data generated through the first Hall sensor and the second Hall sensor.
- hall_X1, hall_Y1, and hall_Z1 are magnetic values for the x-axis, y-axis, and z-axis generated through the first Hall sensor, and hall_X2, hall_Y2, and hall_Z2 are generated through the second Hall sensor. It may be magnetic values for the x-axis, y-axis, and z-axis.
- hall_DiffX, hall_DiffY, and hall_DiffZ may represent magnetic force difference values for the x-axis, y-axis, and z-axis.
- the electronic device may calculate a magnetic force error according to the magnetic force deviation 900 of the magnets disposed on the rotating body from the extracted Hall reference value and the magnetic field difference data. For example, the electronic device may apply the above-described magnetic field difference data to the extracted Hall reference value as shown in Equation 2 below.
- ErrX, ErrY, and ErrZ may represent magnetic error according to magnetic deviation 900 in the x-axis, y-axis, and z-axis, respectively.
- FIG. 9 is a diagram illustrating magnetic force deviation 900 of a plurality of magnets according to an exemplary embodiment.
- the distribution of magnetic force according to process errors during mass production of magnets may be a normal distribution within a range of ⁇ 25%.
- An electronic device eg, the electronic device 300 of FIG. 3
- the error according to Equation 2 may be 0.
- the magnetic deviation 900 sensed by the Hall sensors can be used to determine the offset of the magnetic sensor.
- the electronic device may compensate for a magnetic force error with a magnetic field offset value extracted corresponding to an angular position (or a rotation change amount) from an offset reference table. For example, the electronic device may extract a magnetic field offset value corresponding to the angular position of the rotating body from the offset reference table.
- the offset reference table may include offset values for compensating the remaining components in addition to the geomagnetic component in a situation where the magnetic force of a magnet having a magnetic force deviation 900 of 0% affects the Hall sensor and the magnetic sensor, for example , offset values can compensate for geomagnetic distortion caused by magnets disposed in the electronic device.
- Table 2 below describes an example of an offset reference table. The magnetic error due to the magnetic deviation 900 was not reflected in the offset values of Table 2 below.
- Table 2 above is an arbitrary angular position within the angular range corresponding to one rotation section unit.
- the magnetic field offset values corresponding to can include
- the electronic device may compensate magnetic field offset values through the aforementioned magnetic force error in order to obtain a more accurate offset value in which distortion due to the magnetic deviation 900 is reflected.
- the electronic device may calculate the compensated offset value by compensating the magnetic error calculated based on the extracted magnetic field offset value and the magnetic field difference data as shown in Equation 3 below.
- cal_refX, cal_refY, and cal_refZ may represent compensated offset values for the x-axis, y-axis, and z-axis, respectively. Accordingly, the electronic device may calculate a more accurate offset by compensating for an error due to the magnetic deviation 900 at a corresponding angular position based on magnetic force difference data generated through a pair of Hall sensors.
- FIG. 10 is a diagram illustrating a change in magnetic force caused by movement of a magnet due to rotation of a rotating body in an electronic device according to an exemplary embodiment.
- the electronic device may correct the second magnetic field data generated through the magnetic sensor using the compensated offset value. For example, the electronic device applies (eg, adds or subtracts) the compensated offset value corresponding to each axis among the three axes to the external magnetic field intensity value (eg, geomagnetic value) corresponding to the corresponding axis as shown in Equation 4 below. )can do.
- the external magnetic field intensity value eg, geomagnetic value
- extX, extY, and extZ may respectively represent the magnetic field intensity value along the x-axis, the magnetic field intensity value along the y-axis, and the magnetic field intensity value along the z-axis of the second magnetic field data.
- cal_extX, cal_extY, and cal_extZ may respectively indicate a magnetic field intensity value along the x-axis, a magnetic field intensity value along the y-axis, and a magnetic field intensity value along the z-axis of the corrected second magnetic field data.
- the compensated offset values cal_refX, cal_refY, and cal_refZ are offset values that reflect not only the arrangement of the arranged magnets but also the magnetic force deviation of the magnets, the second magnetic field data can be more accurately corrected.
- the compensated offset value it is possible to reduce the difference between the ideal geomagnetic value to be sensed in each axis of the magnetic sensor and the actual measured geomagnetism value.
- the angular position of the rotating body changes over time from the previous calibration point 1010
- distortion may occur in the magnetic force sensed by the magnetic sensor during the position movement time 1020 of the magnet disposed on the rotating body.
- 10 may show a difference (1000) between an ideal value and an actual value to be sensed in each axis of the magnetic sensor at each point in time when the position of the magnet moves according to the rotation of the rotating body over time.
- an azimuth error is created when calculating the azimuth angle, and it may have an error of about 1 degree per 1 uT.
- the electronic device may remove the difference 1000 shown in FIG. 10 by correcting the compensated offset value calculated as described above with reference to FIGS. 1 to 9 to the second magnetic field data.
- FIG. 11 is a diagram illustrating an operation of correcting second magnetic field data by an electronic device according to an exemplary embodiment.
- an azimuth eg, magnetic north azimuth
- an electronic device eg, the electronic device 300 of FIG. 3
- the electronic device may locate the center point of the trajectory of the magnetic north azimuth at the origin through an operation 1110 of correcting the offset value compensated for the second magnetic field data.
- the electronic device may determine an accurate azimuth using the corrected second magnetic field data and output the determined azimuth. For example, the electronic device may determine the direction and intensity of the geomagnetism applied to the electronic device from the corrected geomagnetism values of each axis of the corrected second magnetic field data. The electronic device may determine an azimuth (eg, magnetic north azimuth) toward which a reference axis of the electronic device is directed from the determined geomagnetic values.
- an azimuth eg, magnetic north azimuth
- the methods described herein may be rendered via such software stored on a recording medium using a general-purpose computer, or a special processor or programmable or dedicated hardware such as an ASIC or FPGA.
- computer code that may be stored in hardware, in firmware, or on a recording medium such as CD ROM, DVD (Digital Versatile Disc), magnetic tape, RAM, floppy disk, hard disk, or magneto-optical disk, or remote recording It can be implemented through execution of computer code or software originally stored on a medium or non-transitory machine readable medium and downloaded over a network to a local recording medium.
- a computer, processor, microprocessor controller or programmable hardware generates computer code or software that, when executed and accessed by the computer, processor, or hardware, implements the processing methods described herein. It may contain memory components (eg, RAM, ROM, flash, etc.) capable of receiving or storing.
- memory components eg, RAM, ROM, flash, etc.
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Abstract
Description
Claims (15)
- 전자 장치에 있어서,상기 전자 장치의 베젤 파트에 대해 회전축을 기준으로 회전 가능하게 결합되고, 복수의 자석들을 포함하는 회전체(rotating body);상기 베젤 파트 내에 배치되고, 상기 복수의 자석들에 의해 생성되는 자기장을 센싱하는 한 쌍의 홀 센서들;상기 회전체의 원주 내의 내부 공간에 배치되는 자기 센서;상기 한 쌍의 홀 센서들 및 상기 자기 센서와 전기적으로 연결되고, 상기 한 쌍의 홀 센서들의 센싱을 통해 생성된 제1 자기장 데이터에 기초하여 상기 자기 센서의 센싱을 통해 생성된 제2 자기장 데이터를 보정하는 프로세서; 및상기 프로세서와 전기적으로 연결된 메모리를 포함하는 전자 장치.
- 제1항에 있어서,상기 회전축을 기준으로 홀 센서들 간에 형성되는 각도가 상기 회전축을 기준으로 상기 복수의 자석들 중 서로 인접한 두 자석들 간에 형성되는 각도보다 작은,전자 장치.
- 제1항에 있어서,상기 회전체에 대응하는 평면에 수직한 방향으로 볼 때, 상기 평면에서 상기 한 쌍의 홀 센서들에 대응하는 지점들로부터 상기 회전축을 향하는 가상의 직선들 간의 각도는, 상기 서로 인접한 두 자석들로부터 상기 회전축을 향하는 가상의 직선들 간의 각도의 절반인,전자 장치.
- 제1항에 있어서,상기 자기 센서는,상기 회전체에 대응하는 평면에 수직하는 방향으로 볼 때, 상기 한 쌍의 홀 센서들 및 상기 회전축 사이의 공간 내에 배치되는,전자 장치.
- 제4항에 있어서,상기 자기 센서는,상기 한 쌍의 홀 센서들 및 상기 회전축 사이로 정의되는 내부 공간 중, 내부 자석이 배치된 영역의 바깥 영역에서, 상기 회전체에서 상기 복수의 자석들이 배치된 평면으로부터 이격되어 배치되는,전자 장치.
- 제1항에 있어서,상기 자기 센서로는 상기 한 쌍의 홀 센서들의 각각에 대해 동일한 거리(equidistant)인,전자 장치.
- 제1항에 있어서,상기 회전체에 대응하는 평면에 수직한 방향으로 볼 때, 상기 자기 센서로부터 상기 회전축을 향하는 가상의 직선은 상기 한 쌍의 홀 센서들로부터 상기 회전축을 향하는 가상의 직선들 간의 각도를 이등분(bisect)하는,전자 장치.
- 제1항에 있어서,상기 프로세서는,상기 한 쌍의 홀 센서들로부터 수집된 자력 차이 패턴에 기초하여 상기 회전체의 회전 변화량을 결정하는,전자 장치.
- 제1항에 있어서,상기 프로세서는,상기 자기 센서의 센싱을 통해 생성된 원시 데이터(raw data)에 보정 계수를 적용하는,전자 장치.
- 제1항에 있어서,상기 프로세서는,상기 한 쌍의 홀 센서들로부터 수집된 제1 자기장 데이터의 차이인 자기장 차이 데이터를 생성하는,전자 장치.
- 제10항에 있어서,상기 프로세서는,홀 센서 기준 테이블로부터 상기 회전체의 각도 위치에 대응하는 홀 기준 값을 추출하고,상기 추출된 홀 기준 값 및 상기 자기장 차이 데이터로부터, 상기 회전체에 배치된 자석들의 자력 편차에 따른 자력 오차를 산출하는,전자 장치.
- 제11항에 있어서,상기 프로세서는,오프셋 기준 테이블로부터 상기 회전체의 각도 위치에 대응하는 자기장 오프셋 값을 추출하고,상기 추출된 자기장 오프셋 값에 상기 자기장 차이 데이터에 기초하여 산출된 자력 오차를 보상함으로써 보상된 오프셋 값을 산출하는,전자 장치.
- 제12항에 있어서,상기 프로세서는,상기 보상된 오프셋 값을 이용하여 상기 자기 센서의 센싱을 통해 생성된 상기 제2 자기장 데이터를 보정하는,전자 장치.
- 제1항에 있어서,상기 프로세서는,상기 회전체의 회전을 검출하는 경우에 응답하여, 상기 자기 센서의 제2 자기장 데이터에 대한 보정을 개시하는,전자 장치.
- 전자 장치에 의해 수행되는 방법에 있어서,상기 전자 장치의 베젤 파트에 배치된 한 쌍의 홀 센서들의 센싱을 통해, 상기 베젤 파트에 대해 회전축을 기준으로 회전 가능하게 결합된 회전체에 포함된 복수의 자석들에 의해 유발되는 자기장에 관한 제1 자기장 데이터를 생성하는 동작;상기 회전체의 원주 내의 내부 공간에 배치된 자기 센서를 통해, 제2 자기장 데이터를 생성하는 동작;상기 회전체의 각도 위치 및 상기 제1 자기장 데이터에 기초하여 보상된 오프셋 값을 산출하는 동작; 및상기 보상된 오프셋 값을 이용하여 상기 제2 자기장 데이터를 보정하는 동작을 포함하는 방법.
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KR102206457B1 (ko) * | 2014-03-17 | 2021-01-21 | 엘지전자 주식회사 | 이동 단말기 |
KR20160104950A (ko) * | 2015-02-27 | 2016-09-06 | 삼성전자주식회사 | 입력 장치, 이를 구비한 전자 장치 및 그 제어 방법 |
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