Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1995-08-18
1997-07-08
Le, Que
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055939, 356430, G01N 2186
Patent
active
056464150
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: 4508450 (1985-04-01), Ohshima et al.
patent: 4794265 (1988-12-01), Quackenbos et al.
patent: 4950911 (1990-08-01), Williams et al.
Le Que
Maioli Jay H.
Sony Disc Technology Inc.
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