Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-03-15
1995-10-31
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369110, 369112, G11B 7135
Patent
active
054636086
ABSTRACT:
An reproducing apparatus reproduces an optical record medium by irradiating the optical record medium with a reading light. The apparatus is provided with: a light irradiation device for irradiating the optical record medium with the reading light; a separation device for separating the reading light reflected by the optical record medium into a first light component which has a first polarization condition and a second light component which has a second polarization condition; a first receiving device for receiving the separated first light component, and outputting a first readout signal indicating the first light component; a second receiving device for receiving the separated second light component, and outputting a second readout signal indicating the second light component; a reproduction device for reproducing information recorded in the optical record medium in response to the readout signals; a first differential signal output device for outputting a first differential signal representing a difference between the first and second readout signals; a double refraction eliminating device for eliminating an effect of double refraction from the first differential signal, and outputting a second differential signal; and a control device for controlling a power of the reading light from the light irradiation device in response to the second differential signal.
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Ben Loha
Pioneer Electronic Corporation
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