Light responsive detector

Details Light responsive detector Light responsive detector

1974-09-11

1976-01-27

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250562, 356237, 73157, G01N 2130

Patent

active

039354687

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.

REFERENCES:
patent: 3105152 (1963-09-01), Nash
patent: 3334239 (1967-08-01), Nash
patent: 3406568 (1968-10-01), Sadowski
patent: 3501760 (1970-03-01), Menary
patent: 3613444 (1971-10-01), Grunwald et al.
patent: 3783274 (1974-01-01), Towne et al.

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