Method and apparatus for optical detection of information

Details Method and apparatus for optical detection of information Method and apparatus for optical detection of information

1986-02-12

1988-05-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

369124, 369 44, G06K 710

Patent

active

047437740

ABSTRACT:
Method and apparatus for optically detecting information from a recording medium in which pits are formed by thermal energy of a light spot to record the information. A reproduction spot is irradiated onto the recording medium to produce a detection signal. From a differential signal of the detection signal, a signal indicative of zero points of the differential signal and a signal indicative of the presence of the pits are detected, and both the signals are used to detect positions of the pits. For stable and accurate detection of the pit position, the relation between pit size W and reproduction spot size W.sub.s is prescribed and the pit size and reproduction spot size are so set as to satisfy 0.45.ltoreq.W/W.sub.s .ltoreq.0.75.

REFERENCES:
patent: 4525822 (1985-06-01), Nishimura

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