Film thickness detector

Details Film thickness detector Film thickness detector

G - Physics

01

R

340/123.5

G01R 11/06 (2006.01) G01B 11/06 (2006.01) G01D 5/34 (2006.01)

Patent

CA 1098987

ABSTRACT A film thickness detector system has first and second thickness detector positions. The first position includes a light source for projecting a light beam to a light detector. A guide roller positions a film strip such that the light beam is tangent to a portion of the film strip supported by the guide roller. The film strip lies between the light source and light detector and the light beam is intercepted by a portion of the film strip at an angle with respect to the longitudinal axis of the film strip. As the thickness of the film strip intercepting a portion of the light beam varies, the output from the light detector varies in a corres- ponding manner. The output is amplified and may be used for stopping motion of the film. The second thickness detector position also has a light source and at least one light de- tector positioned to receive a light beam from the light source. A sensing member is positioned to ride on a surface of the film strip and an opaque member connected to the sensing member is provided having an edge portion which inter- cepts a portion of the light beam such that variations in film thickness correspond to variations in the light detector output Such variations are then amplified and may be em- ployed to stop the film.

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