Apparatus for recording and reading information tracks in an...

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G - Physics

11

B

352/32.1

G11B 7/135 (2006.01) G11B 7/08 (2006.01) G11B 7/12 (2006.01) G11B 7/16 (2006.01)

Patent

CA 1193721

-24- ABSTRACT: "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 com- prises 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 infor- mation 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 cross- talk between the beams being eliminated by means of wavelength-selective filters.

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