# US 12,769,261 B2 · Detection device and rotation detecting method for the crown of smart watch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,769,261 B2 - Document ID: US12769261B2 - Status: Granted - Kind: B2 - Application number: 18/428,602 - Filed: 2024-01-31 - Published: 2024-10-10 - Granted: 2026-10-20 - Earliest claimed: 2023-04-10 - Assignees: Maxic Technology Corporation - Applicants: Maxic Technology Incorporated - Inventors: Zhixun Yang - Web page: https://patentgrep.com/patent/US12769261B2 ## CPC - G04G 21/02: Detectors of external physical values, e.g. temperature - G01B 11/26: for measuring angles or tapers; for testing the alignment of axes - G04G 17/06: Electric connectors, e.g. conductive elastomers - G04G: ELECTRONIC TIME-PIECES - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS ## Abstract A detection device and a rotation detecting method for the crown of a smart watch are provided. Operations on the crown include a pressing action and a rotation action. The method includes: detecting the rotation angle of the crown within a set period of time when the pressing action is identified to obtain a measured rotation angle; and eliminating a misrotation angle from the measured rotation angle, to obtain a true rotation angle corresponding to the rotation action, and taking the true rotation angle as a detection result. ## Claims ### Claim 1 A rotation detecting method for a crown, wherein operations on the crown comprise a pressing action and a rotation action, and the method comprises: detecting, within a set period of time when the pressing action is identified, a rotation angle of the crown to obtain a measured rotation angle; and eliminating a misrotation angle from the measured rotation angle to obtain a true rotation angle corresponding to the rotation action, and taking the true rotation angle as a detection result, wherein the misrotation angle is a first rotation angle detected within a set period of time after a pressing operation; and the true rotation angle is a second rotation angle not including the first rotation angle to determine the detection result. ### Claim 2 (depends on 1) The method according to claim 1, wherein the step of eliminating a misrotation angle from the measured rotation angle to obtain a true rotation angle corresponding to the rotation action comprises: identifying the true rotation angle as 0, if an absolute value of the ratio of the measured rotation angle to a misrotation threshold detected each time within the set period of time is less than 1. ### Claim 3 (depends on 1) The method according to claim 1, wherein the step of eliminating a misrotation angle from the measured rotation angle to obtain a true rotation angle corresponding to the rotation action comprises: identifying the true rotation angle as N×TH, if the ratio of the measured rotation angle to a misrotation threshold TH detected each time within certain time in the set period of time is greater than N-1 and less than N+1, wherein N is a positive integer greater than 0. ### Claim 4 (depends on 1) The method according to claim 1, further comprises: reading the measured rotation angle n times continuously beyond the set period of time, wherein n is a positive integer greater than 1; and performing polynomial fitting on n measured rotation angles to obtain an optimal rotation angle value, and taking the optimal rotation angle value as the detection result. ### Claim 5 A detection device for the crown of a smart watch, wherein operations on the crown comprise a pressing action and a rotation action, and the detection device comprises: an angle measuring module, configured to detect a rotation angle of the crown to obtain a measured rotation angle; a pressing detection module, configured to detect a pressing action on the crown; and a rotation detection module, connected to the angle measuring module and the pressing detection module, and configured to eliminate, within a set period of time when the pressing action is identified, a misrotation angle from the measured rotation angle to obtain a true rotation angle corresponding to the rotation action, which is taken as a detection result, wherein the misrotation angle is a first rotation angle detected within a set period of time after a pressing operation; and the true rotation angle is a second rotation angle not including the first rotation angle to determine the detection result. ### Claim 6 (depends on 5) The device according to claim 5, wherein the angle measuring module comprises: a light emission unit, configured to emit detection light to a side surface of a shaft of the crown; and a light reception unit, configured to receive the detection light reflected by the side surface of the shaft, and obtain the measured rotation angle according to change in light characteristics of the received detection light, wherein the light characteristics of the detection light reflected by the side surface of the shaft are associated with a rotation position of the shaft. ### Claim 7 (depends on 6) The device according to claim 6, wherein the angle measuring module further comprises a packaging shell and a PCB substrate; the packaging shell and the PCB substrate form a first cavity and a second cavity; and the first cavity accommodates the light emission unit, and the second cavity accommodates the light reception unit. ### Claim 8 (depends on 7) The device according to claim 7, wherein the first cavity is formed with a first aperture, and the second cavity is formed with a second aperture; and the light emission unit emits the detection light to the side surface of the shaft through the first aperture, and the light reception unit receives the detection light reflected by the side surface of the shaft through the second aperture. ### Claim 9 (depends on 8) The device according to claim 8, wherein the packaging shell comprises an opaque material surrounding the packaging shell. ### Claim 10 (depends on 8) The device according to claim 8, wherein the angle measuring module further comprises: a first filter unit, disposed between the light emission unit and the first aperture, and configured to shield external light, and enable the detection light emitted by the light emission unit to pass through. ### Claim 11 (depends on 10) The device according to claim 10, wherein the angle measuring module further comprises: a second filter unit, disposed between the light reception unit and the second aperture, and configured to shield external light, and enable the detection light emitted by the light emission unit and reflected by the side surface of the shaft to pass through. ### Claim 12 (depends on 11) The device according to claim 11, wherein the first filter unit is glass with a filter coating or a lens; and/or the second filter unit is glass with a filter coating or a lens. ### Claim 13 (depends on 5) The device according to claim 5, further comprises a pressing detection circuit for detecting a key state of the crown, wherein the pressing detection circuit is configured to output signals of different levels when a key is pressed or not. ### Claim 14 (depends on 13) The device according to claim 13, wherein the light reception unit comprises an opto-sensing circuit and a rotation detecting circuit; and the opto-sensing circuit is connected to the rotation detecting circuit; the opto-sensing circuit is configured to receive the detection light reflected by the side surface of the shaft, and sense light characteristics; and the rotation detecting circuit is configured to obtain the rotation angle of the shaft according to change in the light characteristics. ### Claim 15 (depends on 14) The device according to claim 14, further comprising: a bus control circuit, connected to the opto-sensing circuit, the rotation detecting circuit, and the pressing detection circuit, respectively, wherein the bus control circuit is configured to receive a control signal of a main controller, and send a detection result signal of the rotation detecting circuit and/or the pressing detection circuit to the main controller. ### Claim 16 (depends on 15) The device according to claim 15, wherein the bus control circuit is further configured to be connected to the main controller via an I2C or SPI bus. ### Claim 17 (depends on 5) The device according to claim 5, wherein the rotation detection module is further configured to: identify the true rotation angle as 0, if an absolute value of a ratio of the measured rotation angle to a misrotation threshold detected each time within the set period of time is less than 1. ### Claim 18 (depends on 5) The device according to claim 5, wherein the rotation detection module is further configured to: identify the true rotation angle as N×TH, if a ratio of the measured rotation angle to a misrotation threshold TH detected each time within certain time in the set period of time is greater than N-1 and less than N+1, wherein N is a positive integer greater than 0. ### Claim 19 (depends on 5) The device according to claim 5, wherein the rotation detection module is further configured to: read the measured rotation angle n times continuously beyond the set period of time, wherein n is a positive integer greater than 1; and perform polynomial fitting on n measured rotation angles to obtain an optimal rotation angle value, and take the optimal rotation angle value as the detection result. ### Claim 20 (depends on 5) The device according to claim 5, further comprises: a bus control module, connected to the angle measuring module and the pressing detection module, and configured to receive a control signal of a main controller, and send the detection result of the rotation action and/or the pressing action to the main controller.