System for recording optical discs for use with optical disc playback

Abstract

An optical disc recording system can record data on a writable type optical disc and reproduce the recorded data by utilizing a playback device adapted exclusively for playing back a standardized unwritable optical disc such as a Compact Disc. The optical disc recording system comprises a recording medium and a recording device. The recording medium consists of an optical disc having its recording surface made of a material which is writable with a semiconductor laser and has a relatively high rate of laser beam reflection, having a mechanical size like or compatible with the standard size of an optical disc for playback only and having a pregroove of a relatively small depth. The recording device comprises a data signal outputting circuit for outputting an input signal to be recorded at a predetermined transfer speed as a data signal of a mark length recording system compatible with a standard format of the optical disc for playback only, a drive control circuit for driving the recording medium at a standard speed of the optical disc for playback only and controlling positions of the recording medium and the semiconductor laser so as to be compatible with a standard track pitch of the optical disc for playback only, and a laser control circuit for controlling the irradiation state of the semiconductor laser in accordance with the output of the data signal outputting circuit. The recording medium recorded by the recording device is played back by utilizing a playback device for the optical disc for playback only.