# US 9,519,359 B2 · Touch input apparatus including annular open or closed loop ground plate, with or without slits, positioned around a magnetic core, for decreasing eddy loss > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,359 B2 - Document ID: US9519359B2 - Status: Granted - Kind: B2 - Application number: 14/481,465 - Filed: 2014-09-09 - Published: 2015-04-09 - Granted: 2016-12-13 - Earliest claimed: 2013-10-08 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: IlDoo Jeong; HaZoong Kim - Web page: https://patentgrep.com/patent/US9519359B2 ## CPC - G06F 3/03545: {Pens or stylus} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 3/033: Pointing devices displaced or positioned by the user {, e.g. mice, trackballs, pens or joysticks}; Accessories therefor (digitisers characterised by the transducing means G06F3/041) - G06F 3/0383: {Signal control means within the pointing device} - G06F 3/046: by electromagnetic means - G06F 3/04883: for inputting data by handwriting, e.g. gesture or text - G08C 21/00: Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G08C: TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmitting systems F15B; mechanical means for transferring the output of a sensing member into a different variable G01D5/00; mechanical control systems G05G) ## Abstract The present invention provides an input apparatus which can include a conductivity tip, a coil electrically connected to the tip, and a ground plate electrically connected to the coil and forming an open loop in a circumference direction of the coil. ## Claims ### Claim 1 An input apparatus comprising: a conductivity tip; a coil electrically connected to the conductivity tip; and a ground plate electrically connected to the coil, and forming an open loop in a circumference direction of the coil, wherein the open loop includes an open portion that extends from one side of the ground plate to another side of the ground plate, wherein the ground plate further includes at least one slit that extends into a side of the ground plate, and wherein the open portion of the ground plate is different than the at least one slit in the ground plate, wherein the conductivity tip contacts with a surface of a touch panel outputting an alternating current (AC) power with at least one electrode, a capacitor is formed between the conductivity tip and the at least one electrode by the contact, and the AC power is transferred through the capacitor to the coil, and wherein the coil transmits an electromagnetic signal to an antenna of the touch panel according to an electromagnetic induction. ### Claim 2 (depends on 1) The input apparatus of claim 1, further comprising: a non-conductivity pail having a pen shape surrounding the coil, wherein the ground plate is located on a portion of an outer surface of the pail. ### Claim 3 (depends on 1) The input apparatus of claim 1, further comprising: a magnetic core formed in an axis direction of the coil, and an axis direction length of the ground plate is equal to or shorter than an axis direction length of the magnetic core. ### Claim 4 (depends on 3) The input apparatus of claim 3, wherein the ground plate is located between both ends of the magnetic core. ### Claim 5 (depends on 1) The input apparatus of claim 1, further comprising: a resonance circuit including a resonance coil magnetically combined with the coil via magnetic inductance between the coil and the resonance coil, and a resonance capacitor connected to the resonance coil in series. ### Claim 6 (depends on 1) The input apparatus of claim 1, wherein the ground plate includes a plurality of slits. ### Claim 7 (depends on 1) The input apparatus of claim 1, wherein the ground plate includes a plurality of parts separated by the slits, and wherein the parts are integrally connected to one another. ### Claim 8 An input apparatus comprising: a conductivity tip; a coil electrically connected to the conductivity tip; and a ground plate electrically connected to the coil and including at least one slit, wherein the at least one slit extends into a side of the ground plate, wherein the conductivity tip contacts with a surface of a touch panel outputting an alternating current (AC) power with at least one electrode, a capacitor is formed between the conductivity tip and the at least one electrode by the contact, and the AC power is transferred through the capacitor to the coil, and wherein the coil transmits an electromagnetic signal to an antenna of the touch panel according to an electromagnetic induction. ### Claim 9 (depends on 8) The input apparatus of claim 8, wherein the at least one slit in the ground plate has a length equal to or shorter than 20 mm. ### Claim 10 (depends on 8) The input apparatus of claim 8, wherein the at least one slit in the ground plate forms a certain angle with respect to an axis direction of the ground plate. ### Claim 11 (depends on 8) The input apparatus of claim 8, wherein the ground plate includes a plurality of slits. ### Claim 12 (depends on 8) The input apparatus of claim 8, wherein the ground plate includes a plurality of parts separated by the slits, and wherein the parts are integrally connected to one another.