Abstract: Apparatus to record image information, presented in the form of electrical input signals, as complete half-tone images in a spiral centered about the center of a plate-shaped image record and to make sound recordings, from electrical input signals, presented as an optical sound track aligned with and adjacent to the line of half-tone complete images, and to record optical control tracks for controlling playback of the record adjacent to and aligned with the spiral of the half-tone complete images.

Abstract: The specification describes an audio-visual reproduction device for transmitted light recordings of picture, audio and control signals, in a spiral on a disc-shaped information vehicle. Adjacent to the information vehicle there is an arrangement, including on one side an illuminating device and on the other side an optical sensing device for the signals. Furthermore means are provided by which the signals from the information vehicle are converted into pulses processed by a TV receiver. Displacements of the vehicle in the direction perpendicular to its plane are compensated for on the basis of optical signals. Picture, audio and control signals of the information track are continuously projected on to a single line photodiode array by an objective, which is caused automatically to follow the vertical displacements of the information vehicle, that is to say such displacements as occur perpendicularly to its plane. The information track has a strip-like control track for compensating for vertical displacements.