Patent ID: 9182856
Filing Date: 2015-11-10
Classification: G06F

Abstract:
1. A method comprising: detecting movement of a spring structure of a force sensor coupled to a center shaft of an active stylus, the spring structure being formed from at least a portion of a printed circuit board (PCB) of the active stylus such that the at least a portion of the PCB forms at least a portion of the spring structure, the spring structure comprising a plurality of cuts in the PCB of the active stylus such that the at least a portion of the PCB from which the spring structure is formed comprises a continuous portion of the PCB; measuring a change of capacitance between a plurality of electrodes of the force sensor, the electrodes comprising a moving electrode and a stationary electrode, the moving electrode and the stationary electrode formed from the continuous portion of the PCB; and determining an amount of force applied to the center shaft based on the change of capacitance.