Electromagnetic Pointer and Control Method Thereof
AssigneeWaltop International Corporation
InventorsA-Li Wong, CHIH-JEN LI, CHIA-JUI YEH
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Abstract
An electromagnetic pressure-sensitive pointer is disclosed. The electromagnetic pointer comprises a pen core and an oscillating circuit. The pointer core has a pointer tip. The oscillating circuit comprises a plurality of conductive terminals and a conductor. A capacitance of the oscillating circuit is increased through the contact between the conductive terminals and the conductor as a force is applied upon the pointer tip. When pointer's tip is been pressed, the pointer's frequency will have an obvious transition while its pressure-sensitivity is maintained.
Claims22
A control method for an electromagnetic pointer, comprising:
- providing an electromagnetic pointer and an input apparatus, the electromagnetic pointer comprising:
- a core;
- and
- an oscillation circuit comprising a plurality of conductive terminals and a conductive device, a capacitance of the oscillation circuit being increased through the core pushing the conductive device to connect the conductive terminals;
- and
- applying a tip of the core against the input apparatus to push the conductive device to connect the conductive terminals and to increase the capacitance of the oscillation circuit so as to suddenly change a frequency of the oscillation circuit.
An electromagnetic pointer, comprising:
- a core having a tip;
- and
- an oscillation circuit comprising a plurality of conductive terminals and a conductive device, a capacitance of the oscillation circuit being increased through the core pushing the conductive device to connect the conductive terminals so as to suddenly change a frequency of the oscillation circuit.
A method for determining a frequency variation mode of an electromagnetic pointer, comprising:
- detecting a frequency fn of an electromagnetic pointer;
- judging whether the frequency fn is smaller than a tip-on threshold frequency fon which a writing trace starts to appear;
- judging whether the frequency fn is smaller than an upper limit frequency fUB which is designated as the frequency when a first stage of a switch of the electromagnetic pointer is turned on;
- and
- judging whether the frequency fn is smaller than the lower limit frequency fLB which is designated as the frequency when a second stage of a switch of the electromagnetic pointer is turned on.
A method for dynamically adjusting tip pressure-sensitive levels of an electromagnetic pointer, comprising:
- comparing a frequency fn and a minimum pressure-sensitive level frequency f1 of the electromagnetic pointer;
- judging whether the frequency fn is larger than the minimum pressure-sensitive level frequency f1;
- judging whether the frequency fn is larger than a maximum pressure-sensitive level frequency f2;
- refreshing the maximum pressure-sensitive level frequency f2 so that the frequency fn is a new maximum pressure-sensitive level frequency if the frequency fn is larger than the maximum pressure-sensitive level frequency f2;
- and
- calculating tip pressure-sensitive levels of the electromagnetic pointer according to the new maximum pressure-sensitive level frequency and the minimum pressure-sensitive level frequency f1.
Dependencies are inferred from the claim text.