RECORD CARRIER WITH SECTOR ADDRESS SECTIONS

摘要

PHN.9062 12.5.78 It is described how a user can optically record information in a round disc-shaped record carrier body, and can read the recorded information with one comparatively simple apparatus. The record carrier body which is used is provided with a servo track, which preferably exhibits a phase structure and which contains a multitude of sector addresses per revolution. The apparatus employs only one radiation beam. Before the information is recorded the desired address is Located first. Simultaneously, the radial position and the tangential speed of the radiation spot and the focussing of the radiation beam are checked. While the information is being recorded between the sector addresses it is possible to check whether this information is recorded correctly. During reading of the recorded information the servo track may be used for positioning the radiation spot on the information track.