Electronic Board Eraser and Controlling Method Thereof

Abstract

An electronic board eraser, including: a case, a wiping surface connecting to the case; at least three eraser electrodes; a driving circuit connecting to the at least three eraser electrodes; a sensing electrode; a sensing circuit connecting to the sensing electrode; and a processor connecting to the driving circuit and the sensing circuit, wherein the processor is configured to execute a program module for realizing the following steps: having the sensing circuit sense a beacon signal emitted from a touch panel; and having the driving circuit provide electrical signals to the at least three eraser electrodes after a time period since the beacon signal is emitted.

What is claimed is: 
     
         1 . An electronic board eraser, comprising:
 a case;   a wiping surface connecting to the case;   at least three eraser electrodes;   a driving circuit connecting to the at least three eraser electrodes;   a sensing electrode;   a sensing circuit connecting to the sensing electrode; and   a processor connecting to the driving circuit and the sensing circuit, wherein the processor is configured to execute a program module for realizing the following steps:
 having the sensing circuit sense a beacon signal emitted from a touch panel; and 
 having the driving circuit provide electrical signals to the at least three eraser electrodes after a time period since the beacon signal is emitted. 
   
     
     
         2 . The electronic board eraser according to  claim 1 , wherein the case and the wiping surface are constituted by waterproof material, and make the processor, the sensing circuit and the driving circuit be inside an inner space of the case and the wiping surface. 
     
     
         3 . The electronic board eraser according to  claim 1 , further comprising at least one input device connecting to the processor, wherein after a state of the input device changes, the electrical signals also change correspondingly. 
     
     
         4 . The electronic board eraser according to  claim 3 , wherein the processor enters a power-saving mode from a working mode when the input device detects the electronic board eraser being in still for a period, the processor retrieves the working mode from the power-saving mode when the input device detects the electronic board eraser being moved, a frequency of the sensing circuit sensing the beacon signal in the power-saving mode is slower than that of the sensing circuit sensing the beacon signal in the working mode. 
     
     
         5 . The electronic board eraser according to  claim 1 , wherein the at least three eraser electrodes or the sensing electrode are/is elastic conductive material and a part of the wiping surface. 
     
     
         6 . The electronic board eraser according to  claim 1 , wherein the at least three eraser electrodes comprise force sensors individually, the electrical signals correspond to each force sensors' pressure. 
     
     
         7 . The electronic board eraser according to  claim 1 , wherein the electronic board eraser comprises three eraser electrodes, three distances among the three eraser electrodes are different. 
     
     
         8 . The electronic board eraser according to  claim 1 , wherein the electronic board eraser comprises four eraser electrodes being respectively in four corners of the wiping surface. 
     
     
         9 . The electronic board eraser according to  claim 1 , wherein a modulation method for the electrical signals comprises one of the following:
 emitting a same frequency set of electrical signals via the at least three eraser electrodes sequentially in time-sharing manner;   emitting status messages via one of or multiple the eraser electrodes simultaneously;   emitting different frequency sets of electrical signals via at least two of the eraser electrodes simultaneously; and   emitting two different frequency sets of electrical signals via the at least three eraser electrodes sequentially in time-sharing manner.   
     
     
         10 . The electronic board eraser to  claim 1 , further comprising:
 a battery used to supply electric power to the processor, the sensing electrode and the driving electrode; and   a wireless charging module coupled to the battery, used to receive a wireless signal emitted from the touch panel to charge the battery.   
     
     
         11 . A controlling method for electronic board eraser, comprising:
 having a sensing circuit of an electronic board eraser sense a beacon signal emitted from a touch panel via a sensing electrode of the electronic board eraser; and   having a driving circuit of the electronic board eraser provide electrical signals to at least three eraser electrodes of the electronic board eraser after a time period since the beacon signal is emitted.   
     
     
         12 . The controlling method according to  claim 11 , further comprising: after a state of an input device of the electronic board eraser changes, the electrical signals also change correspondingly. 
     
     
         13 . The controlling method according to  claim 12 , further comprising: entering a power-saving mode from a working mode when the input device detects the electronic board eraser being in still for a period, retrieving the working mode from the power-saving mode when the input device detects the electronic board eraser being moved, a frequency of the sensing circuit sensing the beacon signal in the power-saving mode is slower than that of the sensing circuit sensing the beacon signal in the working mode. 
     
     
         14 . The controlling method according to  claim 11 , wherein the at least three eraser electrodes comprise force sensors individually, the electrical signals correspond to each force sensors' pressure. 
     
     
         15 . The controlling method according to  claim 11 , wherein a modulation method for the electrical signals comprises one of the following:
 emitting a same frequency set of electrical signals via the at least three eraser electrodes sequentially in time-sharing manner;   emitting status messages via one of or multiple the eraser electrodes simultaneously;   emitting different frequency sets of electrical signals via at least two of the eraser electrodes simultaneously; and   emitting two different frequency sets of electrical signals via the at least three eraser electrodes sequentially in time-sharing manner.   
     
     
         16 . The controlling method according to  claim 11 , wherein the electronic board eraser further comprises: a battery used to supply electric power to the processor, the sensing electrode and the driving electrode; and a wireless charging module coupled to the battery, the controlling method further comprises: using the wireless charging module to receive a wireless signal emitted from the touch panel to charge the battery.