Method of detecting a film with optical detecting means in...

Details Method of detecting a film with optical detecting means in... Method of detecting a film with optical detecting means in...

G - Physics

01

B

G01B 11/00 (2006.01) G01N 21/59 (2006.01) G03B 27/46 (2006.01) G03B 27/62 (2006.01) G03D 13/00 (2006.01)

Patent

CA 2142319

In a photographic processing machine, a method for detecting the presence of a film without the need for a reference film. A light receiver has an output with a reference level. A higher reference level is temporarily set, and a light emitter is then increased in illumination until the higher reference level is reached in the light emitter. The light emitter is then preset. As a result, the light emitter has a margin of illumination over the reference level.

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