Position detector utilizing two magnetic field sensors and a scale

A position transducer comprising:

• magnetic field developing means for developing a magnetic field whose strength and direction change in response to a position of the magnetic field developing means;
• magnetic field detecting means moved relatively to the magnetic field developing means for detecting a magnetic field developed by the magnetic field developing means and for providing an electrical signal corresponding to the detected magnetic field;
• and
• relative position detecting means for detecting a relative position of the magnetic field detecting means relative to the magnetic field developing means in response to the electrical signal provided from the magnetic field detecting means, wherein
• the magnetic field detecting means consists of two sensor units each formed from a sensor coil wound on a high permeability core and driven in phase with each other with a high frequency, the two sensor units being disposed in different positions in a direction perpendicular to a moving direction of the magnetic field detecting means relative to the magnetic field developing means, and
• the relative position detecting means detects the relative position of the magnetic field detecting means relative to the magnetic field developing means by determining a difference between outputs of the two sensor units.