# US 11,907,785 B2 · Electronic card with electronic function circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,907,785 B2 - Document ID: US11907785B2 - Status: Granted - Kind: B2 - Application number: 18/061,265 - Filed: 2022-12-02 - Published: 2023-03-30 - Granted: 2024-02-20 - Earliest claimed: 2020-06-05 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Tatsuya Hosotani - Web page: https://patentgrep.com/patent/US11907785B2 ## CPC - G06K 19/0718: {the sensor being of the biometric kind, e.g. fingerprint sensors (fingerprint sensors in general G06V40/13; biometric access-control systems in general, see G07C9/00)} - G06K 19/07354: {by biometrically sensitive means, e.g. fingerprint sensitive (fingerprint sensors in general G06V40/12; biometrically activated access control G07C9/25)} - B42D 25/305: Associated digital information (record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00) - G06K 19/0709: {the source being an interrogation field} - G06K 19/0712: {the arrangement being capable of triggering distinct operating modes or functions dependent on the strength of an energy or interrogation field in the proximity of the record carrier (active means for hindering electromagnetic reading or writing G06K19/07336)} - G06K 19/07705: {the visual interface being a single light or small number of lights capable of being switched on or off, e.g. a series of LEDs} - H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries - H02J 7/865: {Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence)} - H02J 50/12: of the resonant type - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract An electronic card with electronic function circuit includes a communication antenna for short-range wireless communication, a wireless communication IC electrically coupled to the communication antenna, a receiving coil, a resonant capacitor forming a receiving resonant circuit together with the receiving coil, a rectifying and smoothing circuit coupled to the receiving resonant circuit, receiving display elements, a power control unit that controls power from the receiving resonant circuit, and an electronic function circuit that operates by using the power from the receiving resonant circuit. In response to the receiving coil receiving the power, the power control circuit indicates a power receiving state to a user by driving the receiving display elements. ## Claims ### Claim 1 An electronic card with electronic function circuit comprising: a communication antenna for short-range wireless communication; a wireless communication IC electrically coupled to the communication antenna and configured to perform short-range wireless communication; a receiving coil configured to receive power from a magnetic field at a frequency for the short-range wireless communication; a resonant capacitor configuring a receiving resonant circuit together with the receiving coil; a rectifying and smoothing circuit coupled to the receiving resonant circuit; a receiving display element; a power control circuit configured to control power from the receiving resonant circuit; and an electronic function circuit configured to operate by using the power from the receiving resonant circuit, wherein the communication antenna and the receiving coil are configured to share electromagnetic field energy that resonates at the frequency for the short-range wireless communication, and in response to the receiving coil receiving the power from the resonating electromagnetic field energy, the power control circuit is configured to indicate a power receiving state to a user by driving the receiving display element. ### Claim 2 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the receiving display element is configured to indicate strength of power receiving performed by the receiving coil. ### Claim 3 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the power control circuit has a learning function for the power receiving performed by the receiving coil and is configured to control operation timing of the electronic function circuit in cooperation with the wireless communication IC. ### Claim 4 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the electronic function circuit is configured as a biometric authentication circuit and a biometric sensor. ### Claim 5 (depends on 4) The electronic card with electronic function circuit according to claim 4, wherein the biometric authentication circuit is configured as a fingerprint authentication circuit. ### Claim 6 (depends on 4) The electronic card with electronic function circuit according to claim 4, wherein the receiving display element is at a position away from the biometric sensor and is configured to allowing the receiving display element to be recognized in operation of the electronic function circuit. ### Claim 7 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the communication antenna and the receiving coil are on a same plane. ### Claim 8 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the frequency for the short-range wireless communication is a frequency in an industrial science and medical (ISM) band. ### Claim 9 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the frequency for the short-range wireless communication is a frequency in a 6.78 MHz band or a 13.56 MHz band. ### Claim 10 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein the communication antenna is magnetically coupled with the receiving coil. ### Claim 11 (depends on 10) The electronic card with electronic function circuit according to claim 10, wherein a coupling coefficient of magnetic coupling between the receiving coil and the communication antenna is defined based on arrangement and a structure of the communication antenna and the receiving coil and is set within a range from 0.001 to 0.3. ### Claim 12 (depends on 1) The electronic card with electronic function circuit according to claim 1, wherein after the wireless communication IC is activated, the power control circuit is configured to cause the electronic function circuit to operate by using the power received by the receiving coil. ### Claim 13 (depends on 1) The electronic card with electronic function circuit according to claim 1, further comprising: an electric storage device configured to store the power received by the receiving coil. ### Claim 14 (depends on 13) The electronic card with electronic function circuit according to claim 13, wherein after the wireless communication IC is activated, the power control circuit is configured to cause the electronic function circuit to operate by using the power from the electric storage device. ### Claim 15 (depends on 13) The electronic card with electronic function circuit according to claim 13, wherein after end of operation of the electronic function circuit, the power control circuit is configured to store the power received by the receiving coil in the electric storage device. ### Claim 16 (depends on 13) The electronic card with electronic function circuit according to claim 13, further comprising: a charge and discharge control circuit configured to control charging and discharging of the electric storage device; and a charging display element configured to display a charging state of the electric storage device, wherein the charge and discharge control circuit is configured to control charging of the electric storage device and drive the charging display element. ### Claim 17 (depends on 2) The electronic card with electronic function circuit according to claim 2, wherein the power control circuit has a learning function for the power receiving performed by the receiving coil and is configured to control operation timing of the electronic function circuit in cooperation with the wireless communication IC. ### Claim 18 (depends on 2) The electronic card with electronic function circuit according to claim 2, wherein the electronic function circuit is configured as a biometric authentication circuit and a biometric sensor. ### Claim 19 (depends on 5) The electronic card with electronic function circuit according to claim 5, wherein the receiving display element is at a position away from the biometric sensor and is configured to allowing the receiving display element to be recognized in operation of the electronic function circuit. ### Claim 20 (depends on 2) The electronic card with electronic function circuit according to claim 2, wherein the communication antenna and the receiving coil are on a same plane.