Apparatus for recording and reading information tracks on an opt

Details Apparatus for recording and reading information tracks on an opt Apparatus for recording and reading information tracks on an opt

1981-07-10

1985-10-08

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369122, G11B 700

Patent

active

045464634

ABSTRACT:
An apparatus is described for writing and reading information tracks in an information surface of a record carrier by optical radiation. The apparatus comprises two diode lasers, one of which produces the write beam and the other a read beam. By means of polarization sensitive device 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 with residual cross-talk between the beams being eliminated by wavelength-selective filters.

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