Electro-optical apparatus.

摘要

An electro-optical apparatus comprises an objective which scans an optical disc (3) having a transparent protective layer (5) by means of a radiation beam (10) which, through the transparent layer, is focussed on a reflecting recording surface (4), the objective moving along the optical axis (19) for focussing the radiation beam on the recording layer and moreover performing limited pivotal movements. The angular position of the optical axis of the objective is corrected for obliquity of the surface of the optical disc, correction means (22A, B) being provided to tilt the objective through a correction angle, so that the angle between the optical axis and the normal to the disc surface is reduced.