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

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, HaZoong, Jeong, IlDoo
• Primary Examiner(s): Giesy, Adam R
• Assistant Examiner(s): KIYABU, KARIN A
• Application Number:
  US14/481,465
• Publication Number:
  US 20150097806A1
• Time in Patent Office: 826 Days
• US Class Current: 1/1
• CPC Class Codes: 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
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0383 Signal control means within the pointing device
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: G06F 3/04883 for inputting data by handwriting, e.g. gesture or text
• CPC Class Codes: G08C 21/00 Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system

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

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.

2. 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.

3. 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.

4. The input apparatus of claim 3, wherein the ground plate is located between both ends of the magnetic core.

5. 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.

6. The input apparatus of claim 1, wherein the ground plate includes a plurality of slits.

7. 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.

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.

9. 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.

10. 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.

11. The input apparatus of claim 8, wherein the ground plate includes a plurality of slits.

12. 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.