Film-width and transmittance scanner system

Details Film-width and transmittance scanner system Film-width and transmittance scanner system

1984-04-02

1985-03-26

Perkey, William B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250560, 356385, 364563, G03D 1300, G01B 1104

Patent

active

045069697

ABSTRACT:
A graphic arts film processor includes a scanner which measures the transmittance of light through the film along a line or a set of parallel lines positioned at a skew angle A with respect to the direction of film travel. A film switch is located at the upstream end of the scanner. The film width is determined based upon the skew angle A, the film transport speed and time intervals between changes in the signals from the scanner and the film switch which correspond to the leading and trailing ends of the film. The film length is determined based upon the transport speed and a time interval between changes in the signal from the film switch corresponding to the leading and trailing ends. Developer replenishment is controlled based upon an integrated transmittance complement measured by the scanner, and fix replenishment is controlled as a function of the film length, the film width, and the integrated transmittance complement.

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patent: 4128325 (1978-12-01), Melander et al.
patent: 4134663 (1979-01-01), Laar et al.
patent: 4174169 (1979-11-01), Melander et al.

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