Patent ID: 6892588

Claim:
A torque sensor comprising: a first shaft; a second shaft capable of rotating elastically with respect to said first shaft; a first alternating signal output means for outputting a first alternating signal of which phase changes according to changes in the rotation angle of said first shaft; a second alternating signal output means for outputting a second alternating signal of which phase changes according to changes in the rotation angle of said second shaft; an output signal processing unit for outputting a phase difference correspondence signal of which waveform changes according to changes in a phase difference between said first alternating signal and second alternating signal wherein; said output signal processing unit having a first logic signal conversion circuit for converting said first alternating signal into a first logic signal, a second logic signal conversion circuit for converting said second alternating signal into a second logic signal such that a phase difference between said first alternating signal and said second alternating signal is equal to a phase difference between said first logic signal and said second logic signal; said output signal processing unit processing said first logic signal and said second logic signal to produce said phase difference correspondence signal from which a value corresponding to a torque transmitted by the first and second shafts is found.