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Touch input apparatus including annular open or closed loop ground plate, with or without slits, positioned around a magnetic core, for decreasing eddy loss

  • US 9,519,359 B2
  • Filed: 09/09/2014
  • Issued: 12/13/2016
  • Est. Priority Date: 10/08/2013
  • Status: Active Grant
First Claim
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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, andwherein 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, andwherein the coil transmits an electromagnetic signal to an antenna of the touch panel according to an electromagnetic induction.

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