Measurement device of photographic density of film

Details Measurement device of photographic density of film Measurement device of photographic density of film

1983-11-16

1986-03-11

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

250559, 250571, 356429, G01N 2159

Patent

active

045752516

ABSTRACT:
In a measurement device of photographic density of a film wherein a light source is provided on one side over a film carrier route and a plurality of light receiving elements for converting transmitted light of a film emitted from the said light source to an electrical signal are provided on the counter side of the light source forming a line, a device for measuring photographic density of the film comprising a means for obtaining a rate of change in the form of a ratio between a reference signal decided beforehand for each of the light receiving elements and an output signal of the light receiving elements when the film is carried, and a means for obtaining photographic density of the film in accordance with the obtained ratio.

REFERENCES:
patent: 3709613 (1973-01-01), Zahn et al.
patent: 3787689 (1974-01-01), Fidelman
patent: 3995959 (1976-12-01), Shaber
patent: 4061428 (1977-12-01), Amano et al.
patent: 4345831 (1982-08-01), Kachelries
patent: 4370558 (1983-01-01), Kinoshita et al.

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