Abstract: System for processing fine position signals pulse-width modulates signals from two magnetic sensors for producing sinusoidal wave signals different from each other in phase by a quarter cycle in correspondence with the scale pitches, then switches the phase so as to bring the pair of pulse-modulated signals in phase with each other, then calculates the weight constants for the pair of pulse-width modulated signals in phase in order that of said pair of pulse-width modulated signals in phase, any one having a higher linearity will be treated at a handsome rate, and then subjects said pulse-width modulated signals to weighted mean by the use of the resultant weight constants, with the result that the pair of pulse-width modulated signals will become free from disorder at the switching point, thereby producing signals of a high accuracy representing fine positions corresponding to the scale pitch divided at regular intervals.

Abstract: A method for easy and accurate positioning of a magnetic sensor in a fluid-power cylinder facing a magnetic scale on the lateral surface of a piston rod, wherein the sensor is supported by a hole in the cylinder, a piece of friction-resistant, non-magnetic material attached to the sensor projects from its detection surface towards the piston rod, and the non-magnetic material is made to keep in touch with the lateral surface of the moving piston rod by a pressure-applying bias. The friction-resistant, non-magnetic material is either fitted to the magnetic detection surface, or is formed into a tubular shape and fitted to the outer circumference of the sensor.