Probes for measuring apparatus

摘要

A contact sensitive probe, especially for coordinate measuring apparatus, comprising a housing having seatings defining a stable rest position for a stylus member projecting from the housing to terminate at a sensing tip, together with a spring for urging the stylus member toward the stable rest position to effect relocation thereof after displacement due to contact of the tip with the test surface, wherein displacement of the stylus member is detected by a capacitative transducer having one plate carried by the housing and one plate carried by the stylus member, said transducer being connected to a circuit means adapted to produce an output signal indicative of a change in capacitance.