# US 12,008,176 B2 · Active stylus with wireless charging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,008,176 B2 - Document ID: US12008176B2 - Status: Granted - Kind: B2 - Application number: 18/002,192 - Filed: 2020-08-31 - Published: 2023-07-13 - Granted: 2024-06-11 - Earliest claimed: 2020-08-31 - Assignees: Google Inc. - Applicants: Google LLC - Inventors: Liang Jia; Srikanth Lakshmikanthan; Liyu Yang - Web page: https://patentgrep.com/patent/US12008176B2 ## CPC - G06F 3/03545: {Pens or stylus} - G06F 1/1632: {External expansion units, e.g. docking stations} - G06F 1/266: {Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips} - H02J 7/731: {specially adapted for holding portable devices containing batteries (H02J7/751 takes precedence)} - H02J 50/00: Circuit arrangements or systems for wireless supply or distribution of electric power - H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices} - H02J 50/90: involving detection or optimisation of position, e.g. alignment - H04B 5/79: for data transfer in combination with power transfer - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04B: TRANSMISSION ## Abstract An example active stylus includes a core comprising: a main cylinder having a first end, a second end; a first supplemental cylinder disposed at the first end of the main cylinder and having a diameter that is larger than a diameter of the main cylinder; a second supplemental cylinder disposed between the first supplemental cylinder and the second end of the main cylinder and having a diameter that is larger than the diameter of the main cylinder; and a wireless charging receive coil configured to transduce flux of a magnetic field generated by a wireless charging transmit coil into electrical current, wherein the wireless charging receive coil is positioned around a longitudinal axis of the main cylinder of the core and between the first supplemental cylinder and the second supplemental cylinder. ## Claims ### Claim 1 An active stylus comprising: a power storage device; one or more components configured to operate using electrical energy provided by the power storage device; a core comprising: a main cylinder having a first end, a second end; a first supplemental cylinder disposed at the first end of the main cylinder and having a diameter that is larger than a diameter of the main cylinder; a second supplemental cylinder disposed between the first supplemental cylinder and the second end of the main cylinder and having a diameter that is larger than the diameter of the main cylinder; and a wireless charging receive coil configured to provide received power to the power storage device, wherein the wireless charging receive coil is positioned around a longitudinal axis of the main cylinder of the core and between the first supplemental cylinder and the second supplemental cylinder. ### Claim 2 (depends on 1) The active stylus of claim 1, wherein a height of the first supplemental cylinder is equal to a height of the second supplemental cylinder. ### Claim 3 (depends on 1) The active stylus of claim 1, wherein a height of the first supplemental cylinder is different than a height of the second supplemental cylinder. ### Claim 4 (depends on 3) The active stylus of claim 3, wherein the height of the first supplemental cylinder is greater than the height of the second supplemental cylinder. ### Claim 5 (depends on 1) The active stylus of claim 1, wherein the longitudinal axis of the main cylinder of the core is parallel to a longitudinal axis of the active stylus. ### Claim 6 (depends on 1) The active stylus of claim 1, wherein the longitudinal axis of the main cylinder of the core is perpendicular to a longitudinal axis of the active stylus. ### Claim 7 (depends on 2) The active stylus of claim 2, further comprising an alignment aid configured to align the active stylus such that, during charging, the first end of the cylinder is closer to a wireless charging transmit coil than the second end of the cylinder. ### Claim 8 A system comprising: a charger comprising a wireless charging transmit coil; and an active stylus comprising: a core comprising: a main cylinder having a first end, a second end; a first supplemental cylinder disposed at the first end of the main cylinder and having a diameter that is larger than a diameter of the main cylinder; a second supplemental cylinder disposed between the first supplemental cylinder and the second end of the main cylinder and having a diameter that is larger than the diameter of the main cylinder; and a wireless charging receive coil configured to transduce flux of a magnetic field generated by the wireless charging transmit coil into electrical current, wherein the wireless charging receive coil is positioned around a longitudinal axis of the main cylinder of the core and between the first supplemental cylinder and the second supplemental cylinder. ### Claim 9 (depends on 8) The active stylus of claim 8, wherein a height of the first supplemental cylinder is equal to a height of the second supplemental cylinder. ### Claim 10 (depends on 8) The active stylus of claim 8, wherein a height of the first supplemental cylinder is different than a height of the second supplemental cylinder. ### Claim 11 (depends on 10) The active stylus of claim 10, wherein the height of the first supplemental cylinder is greater than the height of the second supplemental cylinder. ### Claim 12 (depends on 8) The active stylus of claim 8, wherein the longitudinal axis of the main cylinder of the core is parallel to a longitudinal axis of the active stylus. ### Claim 13 (depends on 8) The active stylus of claim 8, wherein the longitudinal axis of the main cylinder of the core is perpendicular to a longitudinal axis of the active stylus. ### Claim 14 (depends on 9) The active stylus of claim 9, further comprising an alignment aid configured to align the active stylus such that, during charging, the first end of the cylinder is closer to a wireless charging transmit coil than the second end of the cylinder.