Rotations counter devices having a magnetic bubble micro-circuit.

摘要

The device makes it possible to count the number of rotations of a rotary member comprising a magnet. It comprises a microcircuit having a substrate carrying counting loops (14a, 14b, 14c) with circulation of magnetic bubbles, placed with respect to the magnet in such a way that the rotating field (Ht) of the magnet makes the bubbles pass from one pattern of loops to the following pattern with each rotation of the field. It moreover comprises an electronic compass responsive to the rotating magnetic field of reading means with which the memory is equipped. <IMAGE>