Inspection apparatus for inspecting a defect of an optical disc

Details Inspection apparatus for inspecting a defect of an optical disc Inspection apparatus for inspecting a defect of an optical disc

1997-03-25

1999-06-22

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055939, 356430, G01N 2186

Patent

active

059144955

ABSTRACT:
A disc defect inspection apparatus which can detect a defect of a disc, such as an optical disc, with high accuracy. A disc defect inspection apparatus includes a rotating portion for rotating a disc, laser radiating optical portion for radiating laser lights on the disc rotated by the rotating portion under predetermined scanning conditions, sensors for detecting reflected laser lights from the disc, and a memory in which output signals of the sensors are stored together with address data generated in unison with the scanning of laser lights. Sensor outputs indicative of address positions of the disc are stored in the memory and sensor outputs near the address positions are read out and a defect of the disc is detected on the basis of a spatial difference among the nearby sensor outputs and the sensor output of the center address position.

REFERENCES:
patent: 5471066 (1995-11-01), Hagiwara

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