having a coil axis 12a and two tracking coils 14a 14b the movable section 6 is connected to a stationary section 16 of the scanning device 104 by means of two supports 22a and 22b which stationary section is secured to the slide 104 and comprises a magnetic circuit with a permanent magnet 18 adjoining a gap 20 the scanning device is so positioned relative to the slide 107 that its longitudinal axis 1 is oriented transversely of a plane defined by the axis of rotation 102a and the optical axis 2a thus enabling the objective 2 to be moved both in the focusing direction f and the tracking direction t the gap 20 extends in a tangential direction relative to the turntable 102 in operation the slide 104 is moved along a radial path indicated by the arrow t relative to the axis of rotation 102a of the turntable 102 in order to achieve coarse tracking of an information track situated in an information plane of the rotating disc since the track may be slightly off centered on the optical disc clamped on the turntable and since the turntable may also exhibit small radial deviations allowance is to be made for small radial excursions of the information track during rotation the deviations which in operation may arise between the position of the scanning spot projected onto the disc by the objective and the position of the track portion to be scanned are reduced by means of a radial tracking system forming part of the scanning device 114 in that the lens 2 performs small high frequency tracking movements as indicated by the arrow t it is to be noted that the invention is.