Electromagnetic Stylus for Operating a Capacitive Touch Panel

• US 20100053113A1
• Filed: 12/04/2008
• Published: 03/04/2010
• Est. Priority Date: 09/01/2008
• Status: Abandoned Application

• Current Assignee: Eturbotouch Technology Inc.
• Original Assignee: Eturbotouch Technology Inc.
• Inventors: Wu, Ming-Tsung, Wu, Cheng-Ko
• Application Number:
  US12/327,813
• Publication Number:
  US 20100053113A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0441 using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
• CPC Class Codes: G06F 3/0442 using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser

Abstract

When a user moves an electromagnetic stylus to a capacitive touch panel, a transceiving winding will detect the frequency of the capacitive touch panel. A synchronizing winding will oscillate to generate a signal having a frequency similar to that of the capacitive touch panel. An oscillator will amplify the signal generated by the synchronizing winding. A circuit board will process the signal amplified by the oscillator. Finally the transceiving winding will emit a wireless signal with a frequency similar to that of the capacitive touch panel to interfere with the electric (magnetic) field of the capacitive touch panel so as to detect a triggered coordinate of the capacitive touch panel.

Claims

1. An electromagnetic stylus for controlling a capacitive touch panel comprising:

a housing;

a signal transducer for accessing a frequency signal of the capacitive touch panel;

a transceiving winding encircling the signal transducer for receiving and transmitting wireless signals having a frequency similar to a frequency of the capacitive touch panel;

a synchronizing winding encircling the signal transducer for generating a frequency signal having a frequency similar to the frequency of the capacitive touch panel through oscillation;

an oscillator for amplifying the frequency signal generated by the synchronizing winding; and

a circuit board installed inside the housing and connected to the signal transducer for processing the frequency signal amplified by the oscillator.

2. The electromagnetic stylus of claim 1 wherein the oscillator is installed on the circuit board.

3. The electromagnetic stylus of claim 1 further comprising a battery installed inside the housing for providing power to the electromagnetic stylus.

4. An electromagnetic stylus for controlling a capacitive touch panel comprising:

a housing;

a signal transducer for accessing a frequency signal of the capacitive touch panel;

a transceiving winding encircling the signal transducer for receiving and transmitting wireless signals having a frequency similar to a frequency of the capacitive touch panel;

a synchronizing winding encircling the signal transducer for generating a frequency signal having a frequency similar to the frequency of the capacitive touch panel through oscillation;

a controller for amplifying the frequency signal generated by the synchronizing winding; and

a circuit board installed inside the housing and connected to the signal transducer for processing the frequency signal amplified by the controller.

5. The electromagnetic stylus of claim 4 wherein the controller is installed on the circuit board.

6. The electromagnetic stylus of claim 4 wherein the controller comprises an amplifier for amplifying the frequency signal generated by the synchronizing winding.

7. The electromagnetic stylus of claim 4 further comprising a battery installed inside the housing for providing power to the electromagnetic stylus.

8. An electromagnetic stylus for controlling a capacitive touch panel comprising:

a housing;

a signal transducer for accessing a frequency signal of the capacitive touch panel;

a transceiving winding encircling the signal transducer for receiving and transmitting wireless signals having a frequency similar to a frequency of the capacitive touch panel;

a controller for generating a frequency signal having a frequency similar to the frequency of the capacitive touch panel according to the wireless signals received by the transceiving winding; and

a circuit board installed inside the housing and connected to the signal transducer for processing the frequency signal generated by the controller.

9. The electromagnetic stylus of claim 8 wherein the controller is installed on the circuit board.

10. The electromagnetic stylus of claim 8 wherein the controller comprises an amplifier for amplifying the frequency signal generated by the controller.

11. The electromagnetic stylus of claim 8 further comprising a battery installed inside the housing for providing power to the electromagnetic stylus.