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Hand writing input device for cellular phone

  • US 20030117381A1
  • Filed: 01/25/2002
  • Published: 06/26/2003
  • Est. Priority Date: 12/20/2001
  • Status: Active Grant
First Claim
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1. A hand writing input device for cellular phone comprising:

  • a digital pen containing at least an electromagnetic signal emitting circuit;

    a digital tablet containing a signal selector, a signal amplifier, an analog/digital converter, a micro controller, and a transmission interface, and a wire grid formed of two perpendicular sets of parallel conducting wires being provided on the surface of said digital tablet;

    by using said digital pen to input on said digital tablet, the electromagnetic signal emitted from said digital pen is received by said wire grid on said digital tablet so that current signals are induced in said wire grid whereat said digital pen and said digital tablet contacts each other, said selected current signal is amplified by said signal amplifier after passing through said signal selector, then said amplified current signal is converted to a digital signal by said analog/digital converter, and is treated in said micro controller to form data of the coordinate for the position and relative information, these data then are transmitted to said cellular phone through said transmission interface of said digital tablet and received by transmission interface of said cellular phone, these data are then treated by said cellular phone and are converted into hand written form, graphic data, or computer recognized characters through a handwriting recognition software thereby forming an e-mail, or a brief message, or a document, these data can be sent to any desired destination or stored in the cellular phone through a transmission/storage module.

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