Method and apparatus for controlling activity of developing solu

Details Method and apparatus for controlling activity of developing solu Method and apparatus for controlling activity of developing solu

1982-07-06

1985-07-09

Mathews, A. A.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354324, 356443, 430 30, G03D 1300, G01N 2159

Patent

active

045278784

ABSTRACT:
A method and apparatus for controlling the activity of a developing solution against oxidation by using a test piece for use in an automatic developer. Differences N.sub.4 -N.sub.4 ' and N.sub.5 -N.sub.5 ' between first and second standard densities N.sub.4 and N.sub.5 measured at first and second points of a first test piece developed in a standard developing solution and first and second densities N.sub.4 ' and N.sub.5 ' measured at the same points of a second test piece of the same type as the first one as the same points of the first test piece, developed in a developing solution to be controlled, are obtained. An operating time T of constant-flow supplementing means is calculated according to a formula T=K.sub.1 [K.sub.3 (N.sub.4 -N.sub.4 ')-(N.sub.5 -N.sub.5 ')]+K.sub.2 wherein K.sub.1, K.sub.2 and K.sub.3 are first, second and third predetermined oxidation factors, and then the constant-flow supplementing means is actuated for the obtained operating time T, thereby supplementing a supplementary solution to the developing solution to be controlled in order to restore its activity. A permissible density range may be determined, in which no activity control is performed.

REFERENCES:
patent: 1895760 (1933-01-01), Hunt
patent: 3636851 (1972-01-01), Furst
patent: 3995959 (1976-12-01), Shaber
patent: 4293211 (1981-10-01), Kaufmann
patent: 4365895 (1982-12-01), Shaber

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