Displacement transducer which simultaneously extracts signals via sequential switching

摘要

A displacement transducer comprising a code disk on which a plurality of light permeable slits arranged with a fixed pitch are formed, a light source which emits light to the code disk, and an image sensor which receives the light from the light source through the light permeable slits. High resolution and fast response performance are realized by measuring a displacement of the code disk from the amount of the phase shift of a fundamental wave component contained in the output obtained from the image sensor. There is a further advantage of suppressing zero point return operation to a minimum as well as improving linearity of an image sensor.