Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-03-08
1998-09-22
Tran, Thang V.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4437, G11B 700
Patent
active
058125159
ABSTRACT:
A 0-th order diffracted beam and a plus order diffracted beam generated by passing a single beam emitted from a semiconductor laser through a diffraction grating are focused on a recorded mark on an optical track. Signals of reflected light of the two beams from the recorded mark are detected by a two-element sensor. A difference between the signals is calculated by a differential amplifier. The difference signal is differentiated by a differentiator and the differentiated signal input into a zero cross detector which detects a zero cross point of the differentiated signal. Information represented by the recorded mark is played back according to the zero cross point detected by the zero cross detector.
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NEC Corporation
Tran Thang V.
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