DEVICE FOR COMPENSATING THE LACK OF BALANCE OF A DEVIATING MIRROR BELONGING TO AN OPTICAL SYSTEM

摘要

DEVICE FOR COMPENSATING THE LACK OF BALANCE OF A DEVIATING MIRROR BELONGING TO AN OPTICAL SYSTEM FOR ILLUMINATING A DATA MEDIUM The present invention relates to a device making it possible to eliminate the lack of balance of the deviating mirror of an optical system for illuminating a data medium or support, when said mirror is subject to a rapid displacement. The lack of balance is cancelled out by means of photodetector means receiving the light reflected by a reflecting element positioned around the objective of the optical system for illuminating medium. Control means then make it possible to control the position of the mirror.