Inspection apparatus

Details Inspection apparatus Inspection apparatus

1987-04-13

1988-04-12

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356237, G01N 2188

Patent

active

047376503

ABSTRACT:
A beam of radiation is scanned across a sheet 13 and is either reflected therefrom or transmitted therethrough. Faults in the sheet 13 deflect, scatter or alternate the beam which is then passed to a retroreflector screen 24 where it forms an image 15. Analysis of the image 15 is carried out via the scanning means 22 to determine the faults in the sheet 13.

REFERENCES:
patent: 4522497 (1985-06-01), Ikin
patent: 4629319 (1986-12-01), Clarke et al.

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