APPARATUS FOR RECORDING AND READING INFORMATION TRACKS IN AN OPTICAL RECORD CARRIER

摘要

"Apparatus for writing and reading information tracks in an optical record carrier". An apparatus is described for writing and reading information tracks in an information surface of a record carrier by means of optical radiation. The apparatus comprises two diode lasers, one of which produces the write beam and the other a read beam. By means of polarisation means the write spot and the read spot formed on the information layer are projected at a very small and stable distance from each other and the beams reflected by the information layer are spatially separated. The separated beams are routed to separate detectors, residual crosstalk between the beams being eliminated by means of wavelength-selective filters.