An LD-compatible, write-once type video disk called LD-WO has been developed. An organic dye film was spin-coated on a 2P glass substrate. Subsequently, the Au reflective layer was formed by sputtering on the organic dye layer. Then spin-coating was again used to form the UV hardening resin layer. We achieved a long recording time (about 50 minutes per side) by using the constant linear velocity (CLV) mode (11.4 m/s). A carrier to noise ratio (CNR) of 62.5 dB at 8.1 MHz, was obtained for a duty-controlled (46%) recording when the groove width was 0.70μm.
The signal to noise ratio (SNR) for a NTSC direct FM signal recording was more than 43 dB.
