VERNIER CALIPER HAVING DISPLACEMENT SENSOR FOR SHOWING MEASURING FORCE

摘要

PROBLEM TO BE SOLVED: To provide a configuration for indicating the level of pressure applied to a vernier caliper in an environment where the vernier caliper is used.SOLUTION: A vernier caliper 100 includes a scale member 102, a slider 130, a slider displacement sensor 158 and pressure detection mechanism. The pressure detection mechanism supplies a signal indicating a measuring force and has a plurality of elements made on the same circuit board as the slide displacement sensor 158. The pressure detection mechanism includes a drive coil made on one or more metal layers of the circuit board, and a detection coil. With a signal modulation element attached to a pressure actuator, the pressure actuator moves in accordance with the level of the applied measuring force. The pressure actuator moves relative to a plurality of coils displaced on a straight line, and the attached signal modulation element influences inductive coupling generated among the plurality of coils. Signals obtained from the plurality of coils are used to measure location of the signal modulation element and the corresponding measuring force.