KR20230001479A - Electronic device and operation method of electronic device for calibrating geomagnetic sensor - Google Patents

Abstract

The present invention provides an electronic device capable of correcting distortion of magnetic field by magnet rotation of a bezel to calibrate data of a geomagnetic sensor and display accurate azimuth angles to a user. According to various embodiments of the present invention, the electronic device comprises: a housing; one or more magnets arranged on a wheel rotation part of the housing to be separated at regular intervals; one or more Hall sensors arranged on the lower surface of the wheel rotation part of the housing at regular intervals to measure magnetic force changes of the magnets and position changes of the wheel rotation part; a geomagnetic sensor arranged on the lower surface of the housing to measure earth magnetic field; a memory storing a table in which magnetic force change values of the geomagnetic sensor in accordance with the rotating angle of the wheel rotation part and/or average values of the magnetic force change values of the geomagnetic sensor are written; and a processor operatively connected to the Hall sensors, the geomagnetic sensor, and the memory. The processor can control to sense the rotating status and rotating angle of the wheel rotation part by using the Hall sensors, check the average value of a magnetic force change value corresponding to the rotating angle of the wheel rotation part in the table, and calibrate measurement data values of the geomagnetic sensor based on the checked average value of the magnetic force change value.

Description

Electronic device and method of operating the electronic device for calibrating a geomagnetic sensor

Various embodiments disclosed in this document relate to an electronic device and a method of operating the electronic device for calibrating a geomagnetic sensor, and specifically, an electronic device capable of correcting distortion of geomagnetism due to external interference that may occur due to rotation of a bezel. and a method of operating an electronic device.

Recently, various technologies are being developed using sensors embedded in mobile devices. For example, a technology for estimating location, step length, azimuth, etc. using a mobile device is being developed for indoor location tracking. As an example of a sensor embedded in a mobile device, there is a geomagnetic sensor capable of measuring the earth's magnetic field in order to measure an azimuth.

A geomagnetic sensor is a sensor that detects geomagnetism by measuring a voltage value induced by geomagnetism using a flux-gate or the like. The geomagnetic sensor may be implemented as a 2-axis or 3-axis. In this case, since the geomagnetic output value calculated from each axis geomagnetic sensor varies according to the size of the surrounding magnetic field, it is common to perform normalization to map the geomagnetic output value within a preset range.

A geomagnetic sensor has characteristics that are very vulnerable to external interference. The geomagnetic sensor is affected by distortion depending on the surrounding structures and geomagnetism distribution conditions. The main causes include the influence of surrounding metal structures and the inclination of the geomagnetic sensor. Since the tilt or rotation of the geomagnetic sensor affects the strength of the magnetic field received by the geomagnetic sensor, values measured by the sensor may change.

In the normal state of the geomagnetic sensor, when the Z-axis of the electronic device is placed perpendicular to the earth's surface and the bezel rotates along the X-Y plane along the Z-axis, the data measured by the geomagnetic sensor is centered on (0,0) of the X-Y plane. appears in the form of a circle. However, in a geomagnetic sensor having distortion due to the rotation of the bezel, when the bezel rotates in the Z axis, it may be displayed in the form of an ellipse or a distorted circle instead of a circle.

Therefore, the geomagnetic sensor may measure a magnetic field different from the actual magnetic field if this distortion is not removed. In this case, it may be difficult for the electronic device to provide accurate azimuth information.

An electronic device according to various embodiments includes a housing, at least one magnet disposed at regular intervals on a wheel rotating portion of the housing, and a magnetic force change of the magnets and a position of the wheel rotating portion disposed on a lower surface of the wheel rotating portion of the housing at regular intervals. At least one hall sensor for measuring change, a magnetic sensor disposed on the lower surface of the housing to measure the Earth's magnetic field, a magnetic force change value of the geomagnetic sensor according to the rotation angle of the wheel rotating part, and/or geomagnetism It may include a memory, a hall sensor, a geomagnetic sensor, and a processor operatively connected to the memory for storing a table in which average values of magnetic force change values of the sensor are described. The processor detects whether or not the rotational angle of the wheel rotating part is rotated using a Hall sensor, checks the average value of magnetic force change values corresponding to the rotational angle of the wheel rotating part in the table, and based on the average value of the checked magnetic force change value, the geomagnetic sensor It can be controlled to correct the measured data value of

A method for calibrating a geomagnetic sensor of an electronic device according to various embodiments includes an operation of detecting rotation of a wheel rotation unit and a rotation angle using a Hall sensor, and checking an average value of magnetic force change values of the geomagnetic sensor corresponding to the rotation angle of the wheel rotation unit. and an operation of correcting distortion of geomagnetic sensor data generated when the electronic device rotates based on an average value of the checked magnetic force change values.

According to various embodiments, data of a geomagnetic sensor may be corrected by correcting distortion of a magnetic field due to rotation of a magnet of a bezel, and an accurate azimuth may be displayed to a user.

1 is a block diagram of an electronic device in a network environment, according to various embodiments.
2A is a front perspective view of an electronic device according to various embodiments, and FIG. 2B is a rear perspective view of an electronic device according to various embodiments.
FIG. 3 is an exploded perspective view of the main body 210 of the electronic device 200 of FIG. 2A according to an embodiment.
4 is a block diagram illustrating a configuration of an electronic device according to various embodiments.
5 illustrates a cross-section of an electronic device according to various embodiments.
6 illustrates sensor data of a geomagnetic sensor according to various embodiments.
7 illustrates a structure of an electronic device according to various embodiments.
8A illustrates geomagnetic sensor data and a calibration process thereof according to various embodiments.
8B illustrates a magnetic force distribution of a magnet according to various embodiments.
9 illustrates a magnetism measurement initialization process of an electronic device according to various embodiments.
10A and 10B show data for obtaining an average value of a measured data value of a geomagnetic sensor and a variation amount of geomagnetic sensor data according to various embodiments.
11 is a flowchart of a method for calibrating a geomagnetic sensor of an electronic device according to various embodiments.

1 is a block diagram of an electronic device 101 within a network environment 100, according to various embodiments. Referring to FIG. 1 , in a network environment 100, 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 . According to an embodiment, 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. In some embodiments, in the electronic device 101, at least one of these components (eg, the connection terminal 178) may be omitted or one or more other components may be added. In some embodiments, 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 . According to one embodiment, 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). For example, when the electronic device 101 includes the main processor 121 and the auxiliary processor 123, the auxiliary processor 123 may use less power than the main processor 121 or be set to be specialized for a designated function. can 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. According to one embodiment, 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). there is. According to an embodiment, the auxiliary processor 123 (eg, a neural network processing device) 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. According to one embodiment, 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 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. According to one embodiment, the sensor module 176 may include, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a bio sensor, It may include a temperature sensor, humidity sensor, or light sensor.

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). According to one embodiment, 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.

The 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). According to one embodiment, 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. According to one embodiment, 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 . According to one embodiment, the power management module 188 may be implemented as at least part of a power management integrated circuit (PMIC), for example.

The battery 189 may supply power to at least one component of the electronic device 101 . According to one embodiment, 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. According to one embodiment, 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). Among these communication modules, 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). 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. 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)). -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). According to one embodiment, 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.

The antenna module 197 may transmit or receive signals or power to the outside (eg, an external electronic device). According to one embodiment, 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). According to one embodiment, 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. According to some embodiments, 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.

According to various embodiments, the antenna module 197 may form a mmWave antenna module. According to one embodiment, 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.

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and signal ( e.g. commands or data) can be exchanged with each other.

According to an embodiment, 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 . According to an embodiment, 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 . For example, 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. Alternatively or additionally, 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. To this end, for example, 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. In another embodiment, 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.

Electronic devices according to various embodiments disclosed in this document 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. An electronic device according to an embodiment of the present document is not limited to the aforementioned devices.

Various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, like reference numbers may be used for like or related elements. The singular form of a noun corresponding to an item may include one item or a plurality of items, unless the relevant context clearly dictates otherwise. In this document, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A Each of the phrases such as "at least one of , B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "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." When mentioned, it means that the certain component may be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term "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. can be used as A module may be an integrally constructed component or a minimal unit of components or a portion thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of this document provide one or more instructions stored in a storage medium (eg, internal memory 136 or external memory 138) readable by a machine (eg, electronic device 101). It may be implemented as software (eg, the program 140) including them. For example, a processor (eg, the processor 120 ) of a device (eg, the electronic device 101 ) may call at least one command among one or more instructions stored from a storage medium and execute it. This enables the device to be operated to perform at least one function according to the at least one command invoked. 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. Here, 'non-temporary' only means that 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.

According to one embodiment, 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 Store™) or on two user devices (e.g. It can be distributed (eg downloaded or uploaded) online, directly between smart phones. In the case of online distribution, 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.

According to various embodiments, 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. there is. According to various embodiments, 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. Alternatively or additionally, a plurality of components (eg modules or programs) may be integrated into a single component. In this case, 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. . According to various embodiments, 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.

2A is a front perspective view of an electronic device according to various embodiments, and FIG. 2B is a rear perspective view of an electronic device according to various embodiments.

Referring to FIGS. 2A and 2B , an electronic device 200 (eg, the electronic device 101 of FIG. 1 ) according to various embodiments 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 an electronic device connected to at least a part of the housing 210 ( 200) may include coupling members 250 and 260 that enable detachability of the user's body (eg, a wrist, an ankle, etc.). In another embodiment (not shown), the housing may refer to a structure forming some of the first face 210A, the second face 210B, and the side face 210C of FIG. 2 .

According to one embodiment, 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 . Back plate 207 may be 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. can The side surface 210C is coupled to the front plate 201 and the back plate 207 and may be formed by a side bezel structure (or "side member") 206 including metal and/or polymer. In some embodiments, the back plate 207 and the side bezel structure 206 may be integrally formed and may 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. Integral and plurality of unit links may be formed to flow with each other by woven material, leather, rubber, urethane, metal, ceramic, or a combination of at least two of the above materials.

According to various embodiments, the electronic device 200 includes a display 220 (eg, the display module 160 of FIG. 1 ), audio modules 205 and 208 (eg, the audio module 170 of FIG. 1 ), At least one of the sensor module 211 (eg, the sensor module 176 of FIG. 1), the key input devices 202, 203, and 204 (eg, the input module 150 of FIG. 1) and the connector hole 209. can include 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 exposed through a substantial portion of the front plate 201 , for example. 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 circle, an ellipse, or a polygon. The display 220 may be coupled to or disposed adjacent to a touch sensing circuit, a pressure sensor capable of measuring the strength (pressure) of a touch, 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 direction of sound. The speaker hole 208 can be used as an external speaker and a receiver for a call.

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, a heart rate monitoring (HRM) sensor) disposed on the second surface 210B of the housing 210 . The electronic device 200 includes a sensor module (not shown), for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an IR (infrared) sensor, a bio sensor, a temperature sensor, At least one of a humidity sensor and an illuminance sensor may be further included.

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 202 and 203 disposed on. The wheel key may have a shape corresponding to the shape of the front plate 202 . In another embodiment, the electronic device 200 may not include some or all of the key input devices 202 , 203 , and 204 , and the key input devices 202 , 203 , and 204 that are not included may be displayed on the display 220 . It may be implemented in other forms such as soft keys on the screen. 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. Other connector holes (not shown) 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.

FIG. 3 is an exploded perspective view of the main body 210 of the electronic device 200 of FIG. 2A according to an embodiment.

Referring to FIG. 3 , the body 210 of the electronic device 200 includes a front cover 241, a rear cover 242, a side member 243, a support member (eg, a bracket) 310, a display 320 , a printed circuit board 330 , a battery 340 , or a plurality of conductive patterns 351 , 352 , 353 , and 354 . At least one of the components of the main body 210 may be the same as or similar to at least one of the components included in the main body 210 of FIG. 2A or 2B, and overlapping descriptions will be omitted below.

According to one embodiment, the support member 310 may be disposed between the front cover 241 and the rear cover 242 . The display 320 may be disposed on one surface 311 of the support member 310 facing the front cover 241 . The printed circuit board 330 may be disposed on the other surface (not shown) of the support member 310 facing the rear cover 242 . The display 320 and the printed circuit board 330 may be supported by the support member 310 to ensure rigidity. The support member 310 may be formed of, for example, a metal material and/or a non-metal material (eg, polymer).

According to one embodiment, the display 320 may be disposed between the front cover 241 and the support member 310 . The display 320 may be implemented based on various light emitting devices such as organic light-emitting diodes (OLEDs). According to various embodiments (not shown), the display 320 may include a touch sensing circuit (eg, a touch sensor). The touch sensing circuit may be implemented with a transparent conductive layer (or film) based on various conductive materials such as indium tin oxide (ITO). According to an embodiment, the touch sensing circuit may be disposed between the front cover 241 and a polarization layer (not shown) (eg, an add-on type). According to another embodiment, the touch sensing circuit may be disposed between a polarization layer and a light emitting layer (eg, a layer including a plurality of pixels implemented as a light emitting device such as OLED) (eg, an on-cell type). According to another embodiment, the light emitting layer may include a touch sensing circuit or a touch sensing function (eg, in-cell type). According to various embodiments (not shown), the display 320 may further include a pressure sensor capable of measuring the intensity (pressure) of a touch.

According to an embodiment, the display 320 may include an electrical path such as a flexible printed circuit (FPCB) 321 for electrical connection with the printed circuit board 330 . For example, the FPCB 321 may be disposed in a bent form to be electrically connected to the printed circuit board 330 through a gap between the side 313 and the side member 243 of the support member 310 . A processor, memory, and/or interface may be mounted on the printed circuit board 330 . The processor may include, for example, one or more of a central processing unit, an application processor, a graphics processing unit, an image signal processor, a sensor hub processor, or a communication processor. 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. The interface may electrically or physically connect the main body 210 to an external electronic device, and may include a USB connector, an SD card/MMC connector, or an audio connector. For example, a connector hole for electrical connection with an external electronic device may be formed in the side member 243 or the rear cover 242 .

4 is a block diagram illustrating a configuration of an electronic device according to various embodiments.

According to various embodiments, the electronic device 400 may include a Hall sensor 410, a magnet 420, a geomagnetic sensor 430, a processor 440, and a memory 450. The electronic device 400 may further include at least some of the configurations and/or functions of the electronic device 101 of FIG. 1 . At least some of the components of the illustrated (or not illustrated) electronic device 400 may be operatively, functionally, and/or electrically connected.

According to various embodiments, the electronic device 400 may include a Hall sensor 410 capable of recognizing a magnetic field. The Hall sensor 410 may be disposed at the lower end of the magnet 420 included in the wheel rotating part (or bezel). The Hall sensor 410 may be disposed on the side or rear surface of the electronic device 400 to recognize a magnetic field generated from at least one magnet 420 .

According to various embodiments, the hall sensor 410 may include a plurality of hall elements to recognize a magnetic field generated by the magnet 420 . Information about the magnetic field recognized by the Hall elements can be used to determine the motion of the wheel rotation unit (eg, rotation distance or rotation angle). A hall element may refer to an element that recognizes the direction and magnitude of a magnetic field using a hall effect. The Hall effect is an effect in which a voltage is generated in a direction perpendicular to a current and a magnetic field when a magnetic field is applied to a conductor, and the voltage generated by the Hall effect may be proportional to the strength of the applied current and magnetic field. A charge moving in a magnetic field experiences a force perpendicular to the direction of the magnetic field and the direction in which the charge moves. This force is called the Lorentz force. Due to the Lorentz force, the charge is pulled in one direction in the magnetic field, and the charge density is changed by the pull, and a potential difference is formed. The Hall effect may refer to a potential difference formed by charge drift due to the Lorentz force.

According to various embodiments, the hall sensor 410 may refer to a sensor that converts a magnetic field into an electrical signal using a hall effect. The Hall sensor 410 may sense a magnetic field and measure a potential difference formed by the Hall effect. At this time, as the strength of the magnetic field increases, a greater potential difference may be formed. For example, the strength of the magnetic field may be proportional to the potential difference due to the Hall effect. The Hall sensor 410 measures current by the Hall effect, so it can sense the strength of a magnetic field.

The hall sensor 410 may detect the strength of a magnetic field formed by the magnet 420 . The hall sensor 410 can detect the magnitude of magnetic flux, which is a physical quantity proportional to the strength of the magnetic field. The relative positions of the Hall sensor 410 and the magnet 420 may be matched one-to-one with the value of the magnetic flux detected by the Hall sensor 410 .

While at least one or more magnets 420 move along the wheel rotation part (or bezel) and the relative position of the Hall sensor 410 and the magnet 420 is changed, the value of the magnetic flux detected by the Hall sensor 410 is linear. can change to Since the relative positions of the Hall sensor 410 and the magnet 420 and the magnetic flux detected at the relative position are matched one-to-one, the relative positions of the electronic device 400 and the rotating part of the wheel where the magnet 420 are located can be measured according to the designated magnetic flux. can For example, by storing the value of magnetic flux according to the relative position of the electronic device 400 and the wheel rotating part in the form of a table or graph and checking the magnetic flux detected by the Hall sensor 410 in the stored table, the electronic device 400 ) and the relative position of the wheel rotating part can be measured. That is, the electronic device 400 may measure the amount of angular change corresponding to the magnetic flux value of the Hall sensor 410 .

According to various embodiments, the wheel rotation unit (or bezel) may be integrally connected to the electronic device 400 and implemented. When the electronic device 400 and the wheel rotation unit are integrally implemented, the electronic device 400 may form a first body and the wheel rotation unit may form a second body. For example, in the case of a watch, the electronic device 400 may correspond to a first body including a display, and a rotation wheel may correspond to a second body attached to a housing.

According to various embodiments, the wheel rotation unit (or bezel) may include at least one magnet 420 generating a magnetic field. At least one or more magnets 420 are spaced apart from each other at a predetermined first interval on the wheel rotation unit and may move together in response to the movement of the wheel rotation unit, thereby generating a magnetic field. The magnet 420 may be disposed adjacent to the Hall sensor 410 within a range in which a magnetic field can be recognized by the Hall element. In addition, the magnet 420 may be implemented in various forms depending on the position on the rotating wheel, the area occupied, the polarity of the surface adjacent to the Hall sensor 410, or the arrangement (for example, horizontal/vertical arrangement).

According to various embodiments, the Hall sensor 410 may recognize a magnetic field generated from the magnet 420 . The hall sensor 410 may recognize different magnetic field strengths according to a distance from the magnet 420 . The Hall sensor 410 may provide the processor 520 with recognition information such as the strength or direction of the measured magnetic field. The provided recognition information may be used to determine the motion of the wheel rotation unit (eg, position, rotation angle or rotation distance, etc.).

According to an embodiment, the hall sensor 410 is disposed spaced apart from at least one magnet 420 along the z-axis to sense the movement of at least one magnet according to the movement of the wheel rotation unit.

According to various embodiments, the Hall sensor 410 may include at least one Hall element, an amplifier, and a converter (ADC). The amplifier may amplify recognition information (eg, output voltage or current of the Hall element) of the Hall element. The amplification unit may be implemented as a programmable gain amplifier (PGA), but is not limited thereto. The conversion unit may convert or process an output signal of the Hall element or the amplification unit and provide the converted signal to the processor 440 .

According to various embodiments, the geomagnetic sensor 430 is a sensor that detects geomagnetism and may detect a direction (eg, azimuth) of geomagnetism. The electronic device 400 may display an azimuth using the geomagnetic sensor 430 or provide directions of east, west, south, and north like a compass. Since the geomagnetic sensor 430 is affected by magnets, it may malfunction when there are magnets around. The geomagnetic sensor 430 may be disposed at a lower portion of the electronic device 400 that may be relatively less affected by the magnet 420 . According to one embodiment, the geomagnetic sensor 430 may be used for displaying an azimuth. The processor 440 may use the data of the geomagnetic sensor 430 to more accurately display the direction and/or angle of movement of the user during navigation or map use.

When the electronic device 400 is formed to be worn on a user's wrist, the rear surface of the housing (not shown) may refer to an area directly contacting the user's wrist. The magnet 420 may be arranged to have a certain distance from the geomagnetic sensor 430 in consideration of the effect of magnetic force on the geomagnetic sensor 430 .

According to an embodiment, in order to reduce the effect of magnetic force on the geomagnetic sensor 430, the magnet 420 generates less magnetic force in a specific direction (eg, a center direction, a vertical direction) in which the geomagnetic sensor 430 is disposed ( or suppressed). The magnets 420 may be disposed horizontally, vertically, or diagonally between the N pole and the S pole of at least two magnets. The magnet 420 may have a characteristic of reducing magnetic force generation in a vertical direction by using a plurality of divided magnets. For example, the magnet 420 may have a feature in which the strength of magnetic force is reduced in a specific direction by combining a structure in which the N pole and the S pole of at least two magnets are horizontally or vertically arranged.

According to various embodiments, since one or more magnets 420 are disposed on the wheel rotation unit (or bezel), when the wheel rotation unit is operated, the geomagnetic sensor 430 responds to a change in the magnetic field generated by the one or more magnets 420. may malfunction. In order to prevent such a malfunction, the geomagnetic sensor 430 may be disposed at a lower portion of the housing that can be relatively less affected by the rotation of the wheel.

According to an embodiment, the geomagnetic sensor 430 is a sensor for measuring the magnetic force (geomagnetism) of the earth, and is a three-axis geomagnetic sensor capable of measuring the geomagnetism (M_x, M_y, M_z) of the x-axis, y-axis, and z-axis, respectively. can include According to an embodiment, the geomagnetic sensor 430 may include various types of sensors such as a hall sensor, a magneto resistance (MR) sensor, and a magneto impedance (MI) sensor.

According to various embodiments, the processor 440 may perform a function of controlling each component of the electronic device 400 (eg, the Hall sensor 410, the geomagnetic sensor 430, and the memory 450). To this end, the processor 440 may be electrically and/or functionally connected to each component of the electronic device 400 . Operation and data processing functions that the processor 440 can implement in the electronic device 400 will not be limited, but in various embodiments disclosed in this document, a table for geomagnetic change values stored in the memory 450 is used A function of correcting the data of the sensor 430 and measuring an accurate azimuth will be described.

According to various embodiments, the processor 440 may determine the detected movement type of the wheel rotation unit. The processor 440 turns on or turns off the display of the electronic device 10 based on the movement of the wheel rotation unit, or performs a designated function (eg, execution of a designated UX or execution of a designated application). etc.) can be executed.

According to various embodiments, the processor 440 may be electrically connected to the memory 450 . The electronic device 400 may include one or more memories 450, and the memory 450 may include, for example, a main memory and/or storage. The main memory may include volatile memory such as dynamic random access memory (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM). The storage may include, for example, at least one of one time programmable ROM (OTPROM), PROM, EPROM, EEPROM, mask ROM, flash ROM, flash memory, hard drive, or solid state drive (SSD). . The memory 450 may store information related to motion recognition of the wheel rotating unit. For example, the memory 450 stores a reference table for signals output from the hall sensor 410 according to whether or not a magnet is detected in the rotational part of the wheel, the polarity (N pole or S pole) of the detected magnet, and the strength of the magnet. can be saved As another example, the memory 450 may include information about the polarity and position of the magnet 420 or the strength of the magnetic field.

According to various embodiments, the processor 440 may perform a series of operations for calibrating the geomagnetic sensor 430 as the geomagnetic sensor 430 needs to be calibrated. The processor 440 may calibrate the geomagnetic sensor 430 based on at least some of the data collected by the geomagnetic sensor 430 . When the geomagnetic sensor 430 collects data, the processor 440 may select data to be used for calibration of the geomagnetic sensor 430 according to attitude information of the electronic device 400 .

According to various embodiments, the processor 440 may filter geomagnetic data acquired through the geomagnetic sensor 430 . According to an embodiment, the processor 440 may process data by applying a filter (eg, a Kalman filter, a low pass filter, and/or a moving average) to geomagnetic data obtained through the geomagnetic sensor 430 .

According to an embodiment, the reference data is data representing characteristics of a designated area, and may include various pieces of information related to a signal that can be measured in the designated area. For example, the reference data is the strength of a specified signal (e.g. cellular signal reception strength, wifi signal reception strength, Bluetooth signal reception strength), specified signal ID (e.g. Wifi signal AP ID, Bluetooth ID) , a specified altitude, and a specified barometric pressure. According to an embodiment, the reference data may be classified for each designated area and stored in the memory 450 .

According to an embodiment, the processor 440 may store data of a signal measured in a designated area in the memory 450 as reference data. For example, when the wheel rotating part of the electronic device 400 is located in a designated area, signal information related to a measurable position may be added to reference data of the designated area.

According to various embodiments, the electronic device 400 includes a housing, at least one magnet 420 disposed at regular intervals on the wheel rotating portion of the housing, and disposed at regular intervals on the lower surface of the wheel rotating portion of the housing to generate magnets. At least one hall sensor 410 for measuring a change in magnetic force and a position change of the wheel rotation part, a geomagnetic sensor 430 disposed on the lower surface of the housing to measure the earth's magnetic field, and a rotation angle of the wheel rotation part A processor 440 operatively connected to the memory 420 and the Hall sensor 410, the geomagnetic sensor 430, and the memory 450 for storing a table in which the magnetic change value of the geomagnetic sensor 430 and the average value thereof are stored according to ) may be included. At this time, the processor 440 uses the Hall sensor 410 to detect whether or not the rotation of the wheel rotation unit and the rotation angle are detected, check the average value of magnetic force change values corresponding to the rotation angle of the wheel rotation unit in the table, and check the confirmed change in magnetic force. Based on the average value of the values, the measured data value of the geomagnetic sensor 430 may be controlled to be corrected.

According to an embodiment, the processor 440 may correct for distortion of data of the geomagnetic sensor 430 that occurs when the rotating wheel rotates, based on data measured by the hall sensor 410 .

According to an embodiment, the memory 450 may store data recorded on a magnetic force change value of the geomagnetic sensor 430 according to a rotation angle of the wheel rotation unit and/or a magnetic force change value of the geomagnetic sensor 430 according to a rotation angle change of the wheel rotation unit. It may include data recording the average value of .

According to an embodiment, the processor 440 may correct a data value of the geomagnetic sensor 430 based on data recorded as an average value of change values of magnetic force of the geomagnetic sensor 430 .

According to an embodiment, the processor 440 may control the measurement value of the geomagnetic sensor 430 to be corrected with a preset default value when rotation is not detected in the wheel rotating unit.

According to an embodiment, a magnetic force change value of the geomagnetic sensor 430 and/or an average value of the magnetic force change values of the geomagnetic sensor 430 may be determined corresponding to a rotation angle of the wheel rotation unit.

According to an embodiment, the processor 440 corrects the data value of the geomagnetic sensor 430 by multiplying the data value of the geomagnetic sensor 430 by a correction coefficient, and the correction coefficient is an average value of magnetic force change values of the geomagnetic sensor 430. It can be determined based on the recorded data.

According to an embodiment, the processor 440 may calculate the azimuth of the electronic device 400 based on the calibrated data value of the geomagnetic sensor 430 .

According to an embodiment, the electronic device 400 may further include a display (not shown), and the processor 440 outputs the calculated azimuth on the display based on the calibrated data value of the geomagnetic sensor 430. You can control it.

5 illustrates a cross-section of an electronic device according to various embodiments.

According to various embodiments, the electronic device 400 may include a Hall sensor 410 , a magnet 420 and a geomagnetic sensor 430 .

As mentioned above with reference to FIG. 4 , the geomagnetic sensor 430 may be affected by magnetic force due to a positional change of the magnet 420 while the electronic device 400 in the form of a watch rotates, and it may be difficult to display an accurate azimuth angle. The electronic device 400 according to this document fixes the positions of the Hall sensor 410 and the geomagnetic sensor 430 and measures the change in magnetic force of the magnet 420 to sense the rotation of the wheel rotation unit.

According to FIG. 5 , one or more magnets 420 may be spaced apart from the wheel rotation part (or bezel) of the electronic device 400 . According to one embodiment, the wheel rotation unit (or bezel) may be configured to be rotatable in at least one direction along the outer circumferential surface of the housing. For example, the wheel rotation unit may be rotatable clockwise or counterclockwise. At least one or more magnets 420 may be disposed to operate the wheel rotating unit. For example, when the housing is circular, one or more magnets 420 may be disposed at 45° intervals along the outer circumferential surface of the wheel rotating portion. For example, one or more magnets 420 are clockwise, with a first magnet at 0° (eg, 12 o'clock), a second magnet at 45° (eg, between 12 and 3 o'clock (intermediate)), 90 3rd magnet at ° (e.g. 3 o'clock), 4th magnet at 135° (e.g. between 3 o'clock and 6 o'clock), 5th magnet at 180° (e.g. 6 o'clock), 225° (e.g. A sixth magnet may be disposed at 6 o'clock to 9 o'clock direction), a seventh magnet at 270° (eg, 9 o'clock direction), and an eighth magnet at 315° (eg, 9 o'clock to 12 o'clock direction). Hereinafter, description will be made on the assumption that magnets are disposed at 45° intervals along the outer circumferential surface of the wheel rotation unit, but the position and number of magnets that can be disposed are not limited thereto.

The electronic device 400 may include at least one hall sensor 410 . At least one hall sensor 410 may be spaced apart from the lower end of the wheel rotation unit. At least one hall sensor 410 may detect a change in magnetic force of the magnet 420 according to the rotation of the wheel rotation unit. Whenever the wheel rotating part rotates, the hall sensor 410 may detect a change in magnetic force of the magnet 420 formed in a certain pattern. This constant pattern can be repeated every 45°.

6 illustrates sensor data of a geomagnetic sensor according to various embodiments. According to the graph of FIG. 6 , it can be seen that a certain pattern is formed according to the rotation of the wheel rotation unit. A processor (eg, the processor 440 of FIG. 4 ) may use the Hall sensor 410 to calculate a change in magnetic force of the magnet 420 and a rotation angle of the wheel rotation unit. The processor 440 may calculate a final rotation angle by accumulating rotation angles of the wheel rotation unit, and the user experience may be improved by using the rotation angle as a UX. The UX that the processor 440 can utilize may include, for example, displaying a message application when rotated 45°, displaying a phone application when rotated 90°, and displaying a photo application when rotated 45° after rotating 45° and back again. can

According to various embodiments, the electronic device 400 may include a geomagnetic sensor 430 . A geomagnetic sensor may be used to find magnetic north on a map by measuring the earth's magnetic field in x, y, and z axes. The geomagnetic sensor may output magnetic force measured in x, y, and z axes.

According to the comparative example, the movement of the internal magnet 420 may cause distortion of the magnetic field according to the mounting structure of the geomagnetic sensor 430 in the electronic device 400 . The geomagnetic sensor 430 may generate an azimuth error due to the distortion of the magnetic field.

The electronic device 400 according to this document may reduce an azimuth error by fixing the positions of the geomagnetic sensor 430 and the Hall sensor 410 within the electronic device and applying a correction coefficient. The correction coefficient may include a vector value in the form of 3x3, and the value may vary according to the positions of the geomagnetic sensor 430 and the hall sensor 410.

According to an embodiment, the geomagnetic sensor 430 may be disposed at a location where the influence of the magnet 420 is relatively less. According to FIG. 5 , the geomagnetic sensor 430 may be disposed at a lower portion of a housing that can be relatively less affected by a magnet.

According to FIG. 6, as mentioned above, it can be confirmed that a constant magnetic field pattern is formed according to the rotation of the wheel rotation unit. In the graph of FIG. 6 , the X-axis represents the rotation angle of the wheel rotation unit, and the Y-axis may mean magnetic force based on the geomagnetic sensor. Based on 0, + and - may mean the direction of magnetic force, and the magnitude of the value may mean the strength of magnetic force. The magnetic force difference pattern shown in the graph 600 shown in FIG. 6 is a magnetic field generated using a pair of Hall sensors 410 while the wheel rotation unit rotates in the entire rotation range (eg, 0 degree to 360 degrees). It shows the difference value of the data as a graph. The vertical axis of the graph 600 shown in FIG. 6 is the size of the difference value, and the unit is milli Tesla (mT), and the horizontal axis is the rotation angle of the wheel rotation unit from the reference angular position (eg, the angular position set at 0 degrees), and the unit is may be degrees. The magnetic force difference pattern 600 may include curves 610 , 620 , and 630 of magnetic field difference values sensed on each axis (eg, an x-axis, a y-axis, and a z-axis).

The entire rotation range of the wheel rotating unit may be divided according to the number of magnets. The rotation interval may represent an angular interval obtained by dividing the entire rotation range by the number of magnets. Since two magnets adjacent to each other among the plurality of magnets form the same angle with respect to the rotation axis, the individual rotation section may refer to an angular section in which the entire rotation range is equally divided by the number of the plurality of magnets. For example, when 8 magnets are disposed on the rotating body, the entire rotating range may be divided into 8 rotating sections. In this case, 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, and the third rotation section is from 90 degrees based on the reference angular position The angular section up to 135 degrees, 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, and the sixth rotation section is an angle section from 225 degrees to 270 degrees The section, the seventh rotation section may mean an angular section from 270 degrees to 315 degrees, and the eighth rotation section may mean an angular section from 315 degrees to 360 degrees. The angle range corresponding to one rotation section may refer to an angle formed between two magnets adjacent to each other.

Each of the three waveforms on the chart may mean a graph of magnetic force measured by two hall sensors 410 disposed at the lower end of the wheel rotation part and a geomagnetic sensor 430 disposed at the lower end of the housing. For example, waveform 1 610 may refer to a magnetic force graph measured by a geomagnetic sensor 430 disposed at a lower portion of the housing. Waveform 2 (620) and Waveform 3 (630) may refer to magnetic force graphs measured by two Hall sensors 410 disposed at the lower end of the wheel rotation unit. According to waveform 1 (610) to waveform 3 (630), it can be confirmed that a constant waveform (magnetic field pattern) is repeated at intervals of about 45 degrees. In FIG. 6 , a case in which two Hall sensors 410 are disposed has been described as an example, but the number of Hall sensors 410 that can be disposed is not limited thereto.

The difference data representing the difference between the magnetic field strength values may repeatedly indicate the same or a similar pattern whenever the wheel rotation unit rotates by an angular range (eg, 45 degrees) corresponding to one rotation section. For example, it may be assumed in FIG. 6 that the number of magnets is 8 and the distance between two adjacent magnets is 45 degrees. In this case, the pattern of changing the magnetic field difference value in each axis (eg, x-axis, y-axis, z-axis) may be repeated every time the wheel rotation unit rotates 45 degrees. The electronic device 400 may determine the final angular position based on the previous angular position and the converted rotational angular displacement. For example, the electronic device 400 may accumulate the converted rotational angular displacement at the previous angular position by referring to the graph 600 of FIG. 6 from magnetic field difference data detected after the previous calibration point. The electronic device 400 may determine the final angular position by adding the accumulated rotational angular displacement to the transfer angular position. Also, the electronic device 400 may accumulate angle changes up to an angle range corresponding to one rotation section.

7 illustrates a structure of an electronic device according to various embodiments.

Referring to FIG. 7 , the rotating wheel of the electronic device may include magnets 420 at positions 1 to 8. The wheel rotating portion may rotate clockwise or counterclockwise. The magnet 420 disposed on the wheel rotation unit may rotate along with the rotation of the wheel rotation unit. Unlike the magnet 420, at least one Hall sensor (eg, the Hall sensor 410 of FIG. 4) disposed at the lower end of the wheel rotating unit may be fixed without rotating. The Hall sensor 410 may detect a change in magnetic force due to the moving magnet 420 while being fixed to the lower end of the wheel rotation unit. A processor (eg, the processor 440 of FIG. 4 ) detects a change in magnetic force due to the magnet 420 and motion information (eg, rotation, rotation distance, rotation angle) of the wheel rotation unit using the Hall sensor 410. can

8A illustrates geomagnetic sensor data and a calibration process thereof according to various embodiments.

Tables 810 and 830 show graphs of magnetic force output from a geomagnetic sensor (eg, the geomagnetic sensor 430 of FIG. 4 ) in an electronic device (eg, the electronic device 400 of FIG. 4 ). According to Table 810, it can be confirmed that the output data of the geomagnetic sensor 430 is displayed as a distorted graph rather than a circle due to the influence of the magnet inside the electronic device 400 (eg, the magnet 420 of FIG. 4). .

Table 820 shows correction coefficients for correcting the aforementioned distorted graphs and data. The correction coefficient may be applied to compensate for distortion of data of the geomagnetic sensor 430 by other magnetic materials of the electronic device 400 when the geomagnetic sensor 430 is mounted on the electronic device 400 . A processor (eg, the processor 440 of FIG. 4 ) may apply a constant magnetic force to the geomagnetic sensor 430 while the electronic device 400 is operating. At this time, the processor 440 may apply magnetic force to the geomagnetic sensor 430 in three dimensions and control the magnetic force to be in the form of a sphere. Thereafter, the processor 440 may determine how distorted the data is by using the data of the geomagnetic sensor 430 . For example, if a magnetic force of 100uT is applied to the geomagnetic sensor 430 and an output of 50uT is output at a specific part measured on the geomagnetic sensor 430, the processor 440 multiplies the specific part by a correction factor of 2 to output the output. It can be calibrated so that this 100uT comes out. According to an embodiment, the correction coefficient may be determined based on a rotation angle of the wheel rotation unit or an average value of magnetic force change values of the geomagnetic sensor. Through this process, the geomagnetic sensor 430 can recognize the value of the earth's magnetic field without being distorted by the magnetic material included in the electronic device 400 .

The geomagnetic sensor 430 may include a three-axis sensor having x, y, and z axes. In this case, the correction coefficient may include a 3x3 vector form, and the value of the correction coefficient may be determined differently depending on the positions of the geomagnetic sensor 430 and the hall sensor 410 . Also, the geomagnetic sensor 430 may include a 2-axis sensor having x and y axes, and in this case, the correction coefficient may include a 2x2 vector form. The correction coefficient may be multiplied by the measured data value of the geomagnetic sensor 430, and the graph of Table 830 may be obtained by multiplying the graph of Table 810 by the correction coefficient of Table 820.

According to Table 830, the processor 440 may display a graph of a garden that is not distorted by multiplying the measurement data value of the geomagnetic sensor 430 by a correction coefficient.

8B illustrates a magnetic force distribution of a magnet according to various embodiments. The magnetic force of the magnet 420 may be determined at the time of development of the electronic device 400 . According to Table 840, the x-axis shows the degree of magnetic force based on a specific set value. For example, in the case of the Typ+25% point, it may mean a magnet whose magnetic force is measured stronger by about 25% based on the set value. In the case of a magnet located at the Typ-25% point, it may mean a magnet whose magnetic force is measured less by 25% based on the set value. The y-axis represents the number of magnets that can be included at that point. The graph 842 may mean an ideal normal distribution curve formed based on the set value (Typ). According to the graph 842, the number of magnets having the set value (Typ) is the highest, and the magnets may be distributed based on the set value (Typ). Graph 841 shows the distribution of actual magnetic force, and it can be seen that the number of magnets having magnetic force corresponding to the reference value (Typ) is the highest, and the graph is formed close to normal distribution within 25%. That is, according to the graph 841, the basic magnetic force distribution can be adjusted to around 25%.

According to the comparative embodiment, even if an error occurs in the data of the geomagnetic sensor due to the influence of a moving magnet, it may be difficult for the processor 440 to correct the error to a constant value due to the deviation of the magnetic force distribution. According to various embodiments of the present document, the hall sensor 410 and the geomagnetic sensor 430 are regularly disposed in the electronic device 400, and the processor 440 determines the magnetic force value of the geomagnetic sensor according to the rotation angle of the wheel rotation unit. It can be created as a table and stored in a memory (eg, the memory 450 of FIG. 4). Based on these data and correction coefficients, the processor 440 may correct the data of the geomagnetic sensor 430 according to the condition for the angle change even though there is a deviation in magnetic force as shown in Table 840. Hereinafter, a table for data correction and a correction process will be described.

9 illustrates a magnetism measurement initialization process of an electronic device according to various embodiments.

According to Figure 910, an electronic device (eg, the electronic device 400 of FIG. 4) may perform calibration for measuring magnetism of a geomagnetic sensor (eg, the geomagnetic sensor 430 of FIG. 4). Calibration may be basically set during the production process of the electronic device 400, and may be performed by a user while using the electronic device 400. A producer or user can touch the Magnetic cal menu to perform calibration for magnetic force measurement.

Subsequently, according to Figures 920 and 930, a processor (eg, the processor 440 of FIG. 4) may receive a user's touch input for calibration and perform calibration. As shown in Figure 930, the change in magnetic force can be measured for each angle while rotating the wheel rotating part 360 degrees. The processor 440 may output the measured angle on a display by displaying it in a different color.

10A and 10B show data for obtaining an average value of a measured data value of a geomagnetic sensor and a variation amount of geomagnetic sensor data according to various embodiments.

Referring to FIG. 10A , a memory (eg, the memory 450 of FIG. 4 ) is a magnetic force value of a geomagnetic sensor (eg, the geomagnetic sensor 430 of FIG. 4 ) according to each rotation angle of a wheel rotation unit through a calibration process. can be saved. Since the wheel rotating unit moves by one square every 15 degrees, 24 pieces of data up to 360 degrees at 15-degree intervals can be stored in the table 1010 of FIG. 10A. Each data may be classified into data of a Hall sensor (eg, the Hall sensor 410 of FIG. 4 ) and a geomagnetic sensor 430 . In addition, each data may be divided into x, y, and z axes for each sensor. When the number of Hall sensors 410 is not one, but plural, tables 1010 of FIG. 10A may be formed as many as the number, but the angle change may be calculated based on only one table among them.

Part 1011 indicates geomagnetic data measured by the Hall sensor 410 for each axis. The geomagnetic data may refer to a value obtained by processing a magnetic force value and expressing it as a numerical value or converting it into an angle. The magnetic force value may refer to a physical magnetic force value or a change value of magnetic force that affects the sensor by a magnet. The unit of the magnetic force value may mean mT or uT, and in this table 1010, it may mean uT. Part 1013 indicates geomagnetic data measured by the geomagnetic sensor 430 for each axis. The vertical axis of Table 1010 represents the angle change value, and the horizontal axis represents the value of geomagnetic data according to the angle change of the vertical axis. The angle change of the vertical axis may be recorded in units of 15 degrees, but is not limited thereto.

The table 1010 may include rotation angles, magnetic force values output for each axis of the Hall sensor 410 and the geomagnetic sensor 430 . However, the change amount of the magnetic force value may be different for each deviation of the magnet (eg, the magnet 420 of FIG. 4 ). The deviation of the magnet 420 is the same as that of FIG. 8B, and the processor 440 may have difficulty in applying a constant compensation value due to the variation in magnetic force due to the deviation.

Table 1020 of FIG. 10B shows average values of magnetic force change values measured by the geomagnetic sensor according to angle change conditions in order to accurately compensate for the magnetic force value measured by the geomagnetic sensor. For example, when the wheel rotation part rotates 45 degrees, the magnetic force change value when the rotation angle reaches 45 degrees from 0 degrees may be different from the change value of magnetic force when the rotation angle reaches 90 degrees to 135 degrees. The Hall sensor 410 may measure the rotation angle according to the movement of the magnet 420, but even if the change amount of the rotation angle is the same as 45 degrees, as mentioned above, the change value of the magnetic force may be different. Because of this, it may be difficult for the processor 440 to accurately compensate even if the same compensation value is applied to the measured magnetic force value.

In order to improve this, the processor 440 may compensate with an average value according to conditions for angle change. The processor 440 may obtain all magnetic force change values of angles at which the same change occurs, obtain an average value thereof, and compensate the magnetic force value. For example, if the rotation angle of the wheel rotating part is 45 degrees, the processor 440 calculates (0 degrees, 45 degrees, 90 degrees??) (1021) / (15 degrees, 60 degrees, 105 degrees??) (1023) / ( 30 degrees, 75 degrees, 120 degrees??) (1025) obtains the magnetic force change value and calculates the average value, which can be defined as the magnetic force change value for the rotation angle of 45 degrees. The processor 440 may store the average value of the calculated magnetic force change values in the memory 450 .

11 is a flowchart of a method for calibrating a geomagnetic sensor of an electronic device according to various embodiments.

The illustrated method 1100 may be executed by the electronic device (eg, the electronic device 400 of FIG. 4 ) previously described with reference to FIGS. 1 to 10 , and technical features described above will be omitted below.

In operation 1110, the processor (processor 440 of FIG. 4 ) measures the change value of magnetic force using a geomagnetic sensor (eg, geomagnetic sensor 430 of FIG. 4 ) and stores a table recording the value in a memory (eg, memory of FIG. 4 ). (450)). The magnetic force change value may be determined according to the rotation angle of the wheel rotation unit. At least one magnet (eg, the magnet 420 of FIG. 4 ) on the wheel rotation unit may move according to the rotation of the wheel rotation unit and may change a magnetic force value measured by the geomagnetic sensor 430 .

In operation 1115, the processor 440 may measure an average value of the magnetic force change value according to the rotation angle of the wheel rotation unit according to the angle change condition and store a table in which the average value is recorded in the memory 450. Since the magnetic force change value may be different for each deviation of the magnet 420, it may be difficult to accurately compensate for magnetic field distortion at each change value. For example, when rotating from 0 degrees to 45 degrees and when rotating from 30 degrees to 75 degrees, the rotation angle is the same as 45 degrees, but each magnetic force change value may be different. In this case, the processor 440 may calculate an average value of the former and latter magnetic force change values and perform magnetic field distortion compensation based on the average value. This average value calculation has been previously described in Table 1020 of FIG. 10B.

Operations 1110 and 1115 may be performed during the production process of the electronic device 400, and a user may calibrate the magnetic force value. In operation 1110, the table 1010 of FIG. 10A stored in the memory 450 may be created, and in operation 1115, the table 1020 of FIG. 10B stored in the memory 450 may be created. The creation process of each table 1010 to 1020 has been described above with reference to FIGS. 9 to 10B. The processor 440 may then use the tables 1010 to 1020 stored in the memory 450 to check the angle of the rotational wheel and compensate the geomagnetic data value of the geomagnetic sensor 430 .

In operation 1120, the processor 440 may detect whether the wheel rotation unit rotates. The processor 440 may detect the movement of the magnet 420 on the rotating part of the wheel using at least one Hall sensor (eg, the Hall sensor 410 of FIG. 4 ). When it is determined that the wheel rotation unit does not rotate, the processor 440 may control the geomagnetic sensor 430 to output data in operation 1125 . When the wheel rotating part does not rotate, the movement of the magnet 420 may not affect the geomagnetic sensor 430, so that the geomagnetic sensor 430 can accurately measure the magnetic field and display the azimuth angle.

When it is determined that the wheel rotation unit rotates, the processor 440 may check the rotation angle of the wheel rotation unit using a Hall sensor in operation 1130 . As described above with reference to FIG. 5 , the electronic device 400 may include at least one magnet 420 spaced apart from the wheel rotation unit at equal intervals and at least one hall sensor 410 disposed at the lower end of the wheel rotation unit. can The hall sensor 410 can detect the movement of the magnet 420 according to the rotation of the wheel rotation unit, and can calculate the rotation angle of the wheel rotation unit using this. The rotation angle of the wheel rotation unit can be achieved through the Hall sensor 410, and the Hall sensor 410 can calculate or measure the rotation angle according to a form (eg, algorithm) determined from the manufacturing process of the electronic device 400. . The processor 440 may check the rotation angle of the wheel rotating unit using the Hall sensor 410 . The processor 440 checks the angle change of the wheel rotation unit using the Hall sensor 410 and calculates the magnetic field change value using the table 1010 in which data of the magnetic field change according to the wheel rotation angle stored in the memory 450 is stored. You can check.

The processor 440 may check the rotation angle of the wheel and, in operation 1140, may load the table 1020 in which data of average values of changes in the magnetic field according to the rotation angle of the wheel stored in the memory 450 are stored. In operation 1150, the processor 440 may compensate by adding or subtracting the called data value to the data value of the geomagnetic sensor 430. For example, when the rotation of the wheel rotator is clockwise or counterclockwise so that the magnet 420 approaches the geomagnetic sensor 430, the magnetic force value measured by the geomagnetic sensor 430 may increase. In this case, the processor 440 may compensate by subtracting the called data value from the data value of the geomagnetic sensor 430 . Conversely, when the magnet 420 moves away from the geomagnetic sensor 430 as the wheel rotation unit rotates, the processor 440 may compensate by adding the called data value to the data value of the geomagnetic sensor 430. The geomagnetic sensor 430 may display inaccurate data (eg, a magnetic force value measured by the geomagnetic sensor 430) and an azimuth due to the influence of the rotating magnet 420, and the processor 440 performs this compensation process. Through this, accurate data and azimuth can be acquired. Then, in operation 1155, the processor 440 may control to output compensated data using the geomagnetic sensor.

According to various embodiments, a method for calibrating the geomagnetic sensor 430 of the electronic device 400 includes an operation of detecting rotation of a wheel rotation unit and a rotation angle using the Hall sensor 410, and a method corresponding to the rotation angle of the wheel rotation unit. An operation of checking the average value of the change in magnetic force of the geomagnetic sensor 430 and an operation of correcting for distortion of the data of the geomagnetic sensor 430 that occurs when the electronic device 400 rotates based on the average value of the change value of the checked magnetic force. can include

According to an embodiment, the operation of checking the average value of magnetic force change values of the geomagnetic sensor 430 corresponding to the rotation angle of the wheel rotation unit is the magnetic force of the geomagnetic sensor 430 according to the rotation angle of the wheel rotation unit stored in the memory 450. An operation of checking the data recorded with the change value and the data recorded with the average value of the change value of the magnetic force of the geomagnetic sensor 430 according to the change in the rotational angle of the wheel rotating unit may be further included.

According to an embodiment, an operation of correcting distortion of data of the geomagnetic sensor 430 generated when the electronic device 400 rotates based on an average value of the checked magnetic force change values is corrected to the data value of the geomagnetic sensor 430. An operation of correcting the data value of the geomagnetic sensor 430 by multiplying the coefficient is included, and the correction coefficient may be determined based on an average value of change values of the magnetic force of the geomagnetic sensor 430 .

According to an embodiment, the method of calibrating the geomagnetic sensor 430 of the electronic device 400 may further include an operation of calculating an azimuth of the electronic device 400 based on the calibrated data value of the geomagnetic sensor 430. .

According to an embodiment, the method of calibrating the geomagnetic sensor 430 of the electronic device 400 may further include an operation of outputting the calculated azimuth on a display (not shown) based on the calibrated data value of the geomagnetic sensor 430. can

According to an embodiment, an operation of correcting for distortion of geomagnetic sensor data generated when the electronic device 9400 rotates based on the average value of the checked magnetic force change values is set to a preset default value when rotation is not detected in the wheel rotation unit. An operation of correcting the measurement value of the geomagnetic sensor 430 may be included.

According to one embodiment, the correction coefficient may be determined corresponding to a rotation angle of the wheel rotating unit.

Claims (20)

In electronic devices,
housing;
at least one or more magnets spaced apart from each other at regular intervals on the wheel rotation part of the housing;
at least one hall sensor disposed on the lower surface of the wheel rotation unit of the housing at regular intervals to measure a change in magnetic force of the magnet and a position change of the wheel rotation unit;
a geomagnetic sensor disposed on a lower surface of the housing to measure the earth's magnetic field;
a memory for storing a table in which magnetic force change values of the geomagnetic sensor and/or average values of magnetic force change values of the geomagnetic sensor according to rotation angles of the wheel rotation unit are described;
a processor operatively connected with the Hall sensor, the geomagnetic sensor, and the memory;
The processor
Detect whether or not the wheel rotation part rotates and the rotation angle using the Hall sensor;
Check the average value of the magnetic force change value corresponding to the rotation angle of the wheel rotation unit in the table,
An electronic device controlling to correct the measured data value of the geomagnetic sensor based on the average value of the checked magnetic force change value.
According to claim 1,
The processor
An electronic device that corrects distortion of the geomagnetic sensor data generated when the wheel rotating unit rotates based on the data measured by the Hall sensor.
According to claim 1,
the memory is
Data recording the magnetic force change value of the geomagnetic sensor according to the rotation angle of the wheel rotation unit; and
The electronic device comprising data recording an average value of magnetic force change values of the geomagnetic sensor according to a change in rotation angle of the wheel rotation unit.
According to claim 3,
The processor
An electronic device that corrects a data value of the geomagnetic sensor based on data recorded as an average value of change values of magnetic force of the geomagnetic sensor.
According to claim 4,
The processor
Correcting the data value of the geomagnetic sensor by multiplying the data value of the geomagnetic sensor by a correction coefficient;
The correction factor is
An electronic device determined based on data recorded with an average value of magnetic force change values of the geomagnetic sensor.
According to claim 4,
The processor
An electronic device that calculates an azimuth angle of the electronic device based on the calibrated data value of the geomagnetic sensor.
According to claim 4,
Including more displays,
The processor
An electronic device that controls to output a data value of the geomagnetic sensor corrected based on data recorded as an average value of change values of magnetic force of the geomagnetic sensor to the display.
According to claim 6,
Including more displays,
The electronic device of claim 1 , wherein the processor controls the display to output the calculated azimuth angle based on the calibrated data value of the geomagnetic sensor.
According to claim 1,
The at least one magnet is
It is disposed at a predetermined first interval in the wheel rotation part of the housing and can move together in response to the movement of the wheel rotation part,
The hall sensor
An electronic device configured to be spaced apart from the at least one magnet on a z-axis to detect a movement of the at least one magnet according to a movement of the wheel rotation unit.
According to claim 1,
The electronic device of claim 1 , wherein positions of the at least one magnet, the at least one hall sensor, and the geomagnetic sensor are uniformly formed on the electronic device.
According to claim 1,
The processor
An electronic device configured to correct a measurement value of the geomagnetic sensor with a preset default value when rotation is not detected by the wheel rotation unit.
According to claim 1,
The magnetic force change value of the geomagnetic sensor and/or the average value of the magnetic force change value of the geomagnetic sensor is
An electronic device determined in response to a rotation angle of the wheel rotation unit.
A method for calibrating a geomagnetic sensor of an electronic device,
An operation of detecting rotation of the wheel rotation unit and rotation angle using a hall sensor;
An operation of checking an average value of magnetic force change values of a geomagnetic sensor corresponding to a rotation angle of the wheel rotating unit; and
and compensating for distortion of the geomagnetic sensor data generated when the electronic device rotates based on the checked average value of magnetic force change values.
According to claim 13,
The operation of checking the average value of the magnetic force change value of the geomagnetic sensor corresponding to the rotation angle of the wheel rotation unit is
An operation of checking the data recorded in the memory storing the change in magnetic force of the geomagnetic sensor according to the rotation angle of the wheel rotation unit and/or the average value of the change in magnetic force in the geomagnetic sensor according to the change in rotation angle of the wheel rotation unit. How to include more.
According to claim 13,
The operation of correcting distortion of the geomagnetic sensor data generated when the electronic device rotates based on the average value of the checked magnetic force change value
and correcting the data value of the geomagnetic sensor by multiplying the data value of the geomagnetic sensor by a correction coefficient.
According to claim 15,
The correction coefficient is determined based on an average value of magnetic force change values of the geomagnetic sensor.
According to claim 15,
The correction coefficient is determined corresponding to the rotation angle of the wheel rotation unit.
According to claim 13,
The operation of correcting distortion of the geomagnetic sensor data generated when the electronic device rotates based on the average value of the checked magnetic force change value
and correcting a measurement value of the geomagnetic sensor with a preset default value when rotation is not detected by the wheel rotation unit.
According to claim 13,
The method further includes calculating an azimuth angle of the electronic device based on the calibrated data value of the geomagnetic sensor.
According to claim 19,
The method further includes outputting the calculated azimuth to a display based on the calibrated data value of the geomagnetic sensor.

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