Patent ID: 6232595
Filing Date: 2001-05-15
Classification: G01D

Abstract:
A position detecting apparatus comprising:signal generating means for generating sinusoidal and cosinusoidal signals in response to movement of a position detection object;A/D converting means for converting the sinusoidal and cosinusoidal signals which are generated by said signal generating means, into digital data on the basis of reception of a request signal from an external apparatus; andcalculating means for assuming an amount of a phase shift between a digital data of the sinusoidal signal and a digital data of the cosinusoidal signal, the phase shift being produced by movement of the position detection object during A/D conversion performed by said A/D converting means, on the basis of a movement velocity at a last time which is calculated from a difference between position data in request receptions at a twice preceding time and a once preceding time, for correcting a phase of one of the digital data of the sinusoidal signal and the digital data of the cosinusoidal signal, and for calculating a position data at a present time on the basis of the digital data the phase of one of which is corrected.