Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1984-10-24
1987-01-06
Rosenberger, R. A.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
250563, 356239, G01N 2189, G01N 2186
Patent
active
046342818
ABSTRACT:
The inspection for surface deformation of flat glass is carried out by the flying-spot method wherein the beam of light is thrown by a rotating mirror 13 onto a folding mirror 6 which reflects the light onto the continuous sheet of glass 2 to be inspected. The reflected light beam 4 strikes a light-diffusing plate 1 disposed ahead of the receiver 11. The area of the light-diffusing plate 1 on which the beam of light impinges when the sheet of glass 2 is free of defects is opaque. On this opaque area there are disposed in a spaced relationship two photodiodes 7 between which a light bar formed by the scanning light beam extends. When the thickness of the flat glass 2 varies gradually, light will strike one of the photodiodes 7. The pulse so triggered controls a tracking mechanism 50 which adjusts the folding mirror 6 so that the light bar again extends between the photodiodes 7.
REFERENCES:
patent: 3609380 (1971-09-01), Shaw
patent: 4306808 (1981-12-01), Vander Neut
Feldmuehle Aktiengesellschaft
Rosenberger R. A.
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