# US 2018/0024657 A1 · Electronic pen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024657 A1 - Document ID: US20180024657A1 - Status: Published application - Kind: A1 - Application number: 15/654,356 - Filed: 2017-07-19 - Published: 2018-01-25 - Earliest claimed: 2016-07-25 - Assignees: Wacom Co., Ltd. - Applicants: Wacom Co., Ltd. - Inventors: Kenichi Ninomiya; Takayuki Arai; Kohei Tanaka - Web page: https://patentgrep.com/patent/US20180024657A1 ## CPC - G06F 3/03545: {Pens or stylus} - G06F 3/0414: {using force sensing means to determine a position} - G06F 3/048: Interaction techniques based on graphical user interfaces [GUI] - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract An electronic pen includes: a tubular casing; a rod-shaped core body that projects outside of the casing through an opening of the casing, the opening being formed on one side in axial direction of the casing; a pen pressure detector disposed within a hollow portion of the casing, wherein the pen pressure detector, in operation detects a pen pressure applied to the core body; a core body insertion member disposed between the pen pressure detector and the opening of the casing within the hollow portion of the casing, the core body insertion member housing the core body movably in the axial direction of the casing and having a hollow space closed on a side of the pen pressure detector by a barrier; and a first sealing member that separates the hollow space of the core body insertion member from the hollow portion of the casing. ## Claims ### Claim 1 An electronic pen comprising: a tubular casing; a rod-shaped core body that projects outside of the casing through an opening of the casing, the opening being formed on one side in an axial direction of the casing; a pen pressure detector disposed within a hollow portion of the casing, wherein the pen pressure detector, in operation, detects a pen pressure applied to the core body; a core body insertion member disposed between the pen pressure detector and the opening of the casing within the hollow portion of the casing, the core body insertion member housing the core body movably in the axial direction of the casing and having a hollow space closed on a side of the pen pressure detector by a barrier that is elastically displaceable in the axial direction of the casing; and a first sealing member that separates the hollow space of the core body insertion member from the hollow portion of the casing, wherein, in operation, a pen pressure applied to the core body is transmitted to the pen pressure detector by elastic displacement of the barrier of the core body insertion member based on movement of the core body in the axial direction of the casing within the hollow space of the core body insertion member according to the pen pressure. ### Claim 2 (depends on 1) The electronic pen according to claim 1, wherein the barrier is formed by an elastic member. ### Claim 3 (depends on 1) The electronic pen according to claim 1, wherein the pen pressure detector is coupled to a side of the core body insertion member opposite to the pen pressure detector and the elastic displacement of the barrier according to the pen pressure applied to the core body is transmitted to the pen pressure detector. ### Claim 4 (depends on 1) The electronic pen according to claim 1, wherein the first sealing member is disposed on a side of a core body insertion opening of the core body insertion member. ### Claim 5 (depends on 1) The electronic pen according to claim 1, wherein the first sealing member is a cap-shaped elastic member disposed on an end portion of the core body insertion member on a side of a core body insertion opening of the core body insertion member without closing the core body insertion opening. ### Claim 6 (depends on 1) The electronic pen according to claim 1, wherein a pressing member is fitted on a side of the core body opposite to a side of the core body that projects outside of the casing, and the core body presses the barrier of the core body insertion member via the pressing member according to the applied pen pressure. ### Claim 7 (depends on 1) The electronic pen according to claim 1, wherein the core body insertion member includes a plurality of parts that fit together and are arranged in the axial direction of the casing. ### Claim 8 (depends on 7) The electronic pen according to claim 7, wherein the core body insertion member includes a pen pressure transmission member having a hollow space closed by the barrier, and a pressing member that presses the barrier according to the pen pressure applied to the core body is disposed in the hollow space of the pen pressure transmission member. ### Claim 9 (depends on 8) The electronic pen according to claim 8, wherein the pen pressure transmission member includes an engaging portion engaged with the pen pressure detector. ### Claim 10 (depends on 9) The electronic pen according to claim 9, wherein, when the pen pressure transmission member is engaged with the pen pressure detector, a pressure sensor of the pen pressure detector is retained, and the pen pressure is transmitted to the pressure sensor via the barrier. ### Claim 11 (depends on 7) The electronic pen according to claim 7, wherein: the core body insertion member includes a magnetic core around which a coil is wound and having a hole through which the core body is inserted, a pen pressure transmission member having the barrier, and a holder fitted with the magnetic core, and the holder fitted with the magnetic core is fitted to the pen pressure transmission member. ### Claim 12 (depends on 11) The electronic pen according to claim 11, wherein: a circuit board is disposed on a side of the pen pressure detector that is opposite to the core body insertion member within the hollow portion of the casing, and a coupling portion that couples the circuit board to the pen pressure detector is provided with a second sealing member that closes a gap between the coupling portion and an inner wall of the casing, and an end portion of the coil wound around the magnetic core is connected to a terminal of the pen pressure detector, and a connecting portion that connects the coil to the terminal is disposed in a part sealed by the first sealing member and the second sealing member. ### Claim 13 (depends on 12) The electronic pen according to claim 12, wherein the circuit board is disposed in a board holder and the board holder has a fitting portion fitted to the pen pressure detector, and the second sealing member is formed on the fitting portion of the board holder, the fitting portion being fitted to the pen pressure detector. ### Claim 14 (depends on 13) The electronic pen according to claim 13, wherein the terminal of the pen pressure detector is connected to the circuit board retained in the board holder through the fitting portion of the board holder, and a capacitor connected in parallel with the coil constituting a resonance circuit is disposed on the circuit board. ### Claim 15 (depends on 1) The electronic pen according to claim 1, wherein: a circuit board on which a switch which, in operation, is depressed by a pressing member projects outside of the casing through another opening in the casing that is disposed adjacent to a side of the pen pressure detector that is opposite to the core body insertion member within the hollow portion of the casing, and a coupling portion that couples the circuit board to the pen pressure detector is provided with a second sealing member that closes a gap between the coupling portion and an inner wall of the casing. ### Claim 16 (depends on 15) The electronic pen according to claim 15, wherein: the switch is mounted on an electronic part mounting surface of the circuit board, and the electronic part mounting surface of the circuit board, except for the switch, is covered by a molded member. ### Claim 17 (depends on 1) The electronic pen according to claim 1, wherein a tubular body portion and the barrier are formed by two-color molding, the tubular body portion being included in the core body insertion member. ### Claim 18 (depends on 1) The electronic pen according to claim 1, wherein the pen pressure detector, in operation, detects a capacitance that changes according to the pen pressure. ### Claim 19 (depends on 1) The electronic pen according to claim 1, wherein: a circuit board is disposed on a side of the pen pressure detector that is opposite to the core body insertion member within the hollow portion of the casing, and a coupling portion that couples the circuit board to the pen pressure detector is provided with a second sealing member that closes a gap between the coupling portion and an inner wall of the casing, and a space between the first sealing member and the second sealing member is sealed within the hollow portion of the casing. ### Claim 20 (depends on 1) The electronic pen according to claim 1, wherein a circuit board is disposed on a side of the pen pressure detector that is opposite to the core body insertion member within the hollow portion of the casing, and an electronic part mounting surface of the circuit board is covered by a molded member. ### Claim 21 (depends on 20) The electronic pen according to claim 20, wherein: the core body is conductive, and a signal from a transmission circuit disposed on the circuit board is sent out to the outside through the core body. ### Claim 22 (depends on 1) The electronic pen according to claim 1, wherein the tubular casing is housed within an external casing of the electronic pen.