Apparatus for inspecting negatives

Details Apparatus for inspecting negatives Apparatus for inspecting negatives

1983-03-17

1987-06-02

Willis, Davis L.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

356 73, 356239, G01N 2188

Patent

active

046698850

ABSTRACT:
Disclosed is an apparatus for inspecting negatives which is provided with a laser beam generating source, a scanner for scanning the laser beam, a holding device for holding a negative having a pattern formed in a reflective area on a first surface of a transparent plate and transferring the negative in a direction perpendicular to the scanning direction of the laser beam, a first converging lens for converging the laser beam on said first surface, a second converging lens for converging on a first photocell the beam transmitted through the negative, a third converging lens for converging on a second photocell the beam reflected by the first surface of the negative, and a comparator for comparing a first signal stream put out from the first photocell and a second signal stream put out from the second photocell and detecting an undesirable adhering matter.

REFERENCES:
patent: 3632226 (1972-01-01), Filby
patent: 3693021 (1972-09-01), Lake et al.
patent: 3734624 (1973-05-01), Cornelius
patent: 3746869 (1973-07-01), Lindstept et al.
patent: 3843890 (1974-10-01), Anthony et al.
patent: 3877821 (1975-04-01), Price et al.
patent: 3989385 (1976-11-01), Dill et al.
patent: 4173441 (1979-11-01), Wolf
patent: 4284357 (1981-08-01), Kudo
patent: 4468120 (1984-08-01), Tanimoto et al.

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