Light responsive detector

Details Light responsive detector Light responsive detector

G - Physics

01

N

340/123.2

G01N 21/00 (2006.01) G01N 21/89 (2006.01)

Patent

CA 1061432

ABSTRACT A film inspection apparatus is provided for detecting changes in surface profile of film, e.g. edge breaks sprocket hole tears, poor splices, etc. The film inspection apparatus includes a device mounted above a sapphire film support and having a pair of cantilever jewel carrying members for feeling the surface profile adjacent each edge of a traveling web of film. Each cantilever includes a thin vane which extends into and modulates a respective light beam which is incident upon a respective photocell. Each photocell is connected to a separate channel of a braking circuit to operate a brake for the film driving mechanism when a surface profile is encountered which is to be considered as an unacceptable flaw.

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