Optical recording disc adapted to storing data using an ultra-violet laser source

摘要

Optical record carrier ( 20 ) adapted to storing data using a recording/reading device. The recording/reading device comprises an ultra-violet laser source emitting electromagnetic radiation ( 29 ) having a wavelength X in the range of 230 nm to 270 nm. The recording/reading device further comprises an objective lens ( 21 ) for focussing the electromagnetic radiation ( 29 ) on the optical recording carrier NA is the numerical aperture of the objective lens. The optical record carrier comprises a spiral track ( 22 ), which has a track pitch TP between 0.55* lambda/NA and 0.75* lambda/NA.