Optical data retrieval system using multi-spectral light sources

Details Optical data retrieval system using multi-spectral light sources Optical data retrieval system using multi-spectral light sources

1983-04-11

1986-02-11

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, 369 58, 250578, 365120, G11B 700

Patent

active

045702527

ABSTRACT:
An optical data retrieval system featuring probe beams of different wavelengths directed onto an optically reflective recording medium having different spectral responses to the probe beams. A first probe beam is directed onto the reflective medium in a manner such that the amount of light reflected from the medium may be detected while a second probe beam is directed through the medium in a manner such that the amount of light passing through the medium may be measured. Different amounts for both beams are detected at pits in the medium and in the reflective field surrounding the pits. The redundancy provided by two probe beams eliciting different spectral responses from the medium reduces errors due to dirt and media defects.

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