Magneto-optical reader for multitrack magnetic tapes, comprises magneto-optical head, rotatable parallel face plate in the incident beam and second similar plate in the response beam from the head

摘要

A multi-track magnetic tape (101,102) passes through a magnetic head (104) which receives an incident laser beam (105) and signals a sensor bar (107,108). When wear takes place the active part of the head is displaced (z). Error signals are generated and used to control piezoelectric micromotors which rotate an incident beam parallel face plate (112) and an output signal parallel face plate (109) to compensate for the wear.