Rotary recording medium

Abstract

A rotary recording medium has an information signal along a spiral main track comprising a multiplicity of successively adjacent track turns of respective track turn numbers, first and second reference signals of different frequencies are recorded alternately in the radial direction of the recording medium and along reference signal tracks disposed centrally between the centerlines of mutually adjacent track turns, and a third reference signal is recorded at points where the track turn numbers change at every revolution of the recording medium. The rotary recording medium comprises, over a plurality of track turns in a specific part of the main track, displacement part for displacement of a reproducing tracing element in which displacement parts only either one of the first and second reference signals has been recorded along reference signal tracks on both sides of each of said plurality of track turns. The reproducing tracing element is displaced in the radial direction of the disc by a tracking control means operating in response to the reference signal reproduced by the reproducing tracing element upon tracing the displacement parts to quickly locate recorded information.