Write-once Hi-Vision video disc recorder was developed, based on a dual channel recording and playback technology. It introduces two new technologies, an optical pickup employing newly developed monolithic two-channel laser diode and secondly CLV servo technique with wobbled groove. A 20MHz bandwidth luminance (Y) signal and 6MHZ bandwidth chrominance (C) signals are recorded without bandwidth compression. Recording/playback time is 6 minutes (CAV) and 20 minutes (CLV) with both sides ofthe 30cm alloy mode write-once disc, and S/N of 42dB is obtained.
