Position-detecting sensor for detecting position of a moving object utilizing magnetism

A magnetic position-detecting sensor for detecting a position of a moving object utilizing magnetism comprising:

• a magnetic recording medium carried on the moving object and having first and second signal tracks;
• a magnetic sensor having first and second magnetic resistance elements disposed in opposition to said magnetic recording medium with a spacing therebetween;
• said first magnetic resistance element being disposed nearly said magnetic recording medium and varying its internal resistance by sensing the magnetism of said magnetic recording medium;
• said second magnetic resistance element being disposed nearby said first magnetic resistance element and varying its internal resistance by sensing the magnetism of said magnetic recording medium;
• said first signal track having recorded thereon a first magnetic signal, said first magnetic resistance element detecting said first magnetic signal and providing a first output indicative of a position of the moving object;
• said second signal track having recorded thereon a second magnetic signal, said second magnetic resistance element detecting said second magnetic signal and providing a second output indicative of changes in the spacing between said magnetic recording medium and said magnetic sensor;
• wherein said second output of said second magnetic resistance element enables correction of variations in said first output of said first magnetic resistance element due to said changes in the spacing between said magnetic recording medium and said magnetic sensor.