Method and apparatus for controlling the rate of replenishment o

Radiation imagery chemistry: process – composition – or product th – Including control feature responsive to a test or measurement

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430398, 430399, 430400, 354297, 354298, 354324, 355 27, G03C 500, G03C 300, G03D 1300, G03D 302

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055188451

ABSTRACT:
A method and apparatus for controlling the rate of replenishment of chemical solutions in a photographic processing apparatus used for copying a photographic negative having a transmittance onto photographic material includes a number of steps and an apparatus for carrying out those steps. First, light is exposed onto the photographic negative to form a latent image of the photographic negative on the photographic material. Next, the latent image formed on the photographic material is developed by placing the photographic material in chemical solutions. The photographic material reacts with the chemical solutions to form an amount of dyes on the developed photographic material. The exposure given to the photographic material is measured and then the amount of dyes on the developed photographic material is obtained from the measured exposure. A signal related to the measured exposure given to the photographic material is generated and the signal is used to control the replenishment rate of the chemical solutions, wherein the generated signal which establishes the replenishment rate is directly related to the amount of dyes on the developed photographic material.

REFERENCES:
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patent: 3787689 (1974-01-01), Fidelman
patent: 3905698 (1975-09-01), Schroter et al.
patent: 4081280 (1978-03-01), Corluy et al.
patent: 4642276 (1987-02-01), Burtin
patent: 4881095 (1989-11-01), Shidara
English translation of Japanese Patent 61-275757 Published Dec. 5, 1986.
Jones et al., "Control of Photographic Printing by Measured Characteristics of a Negative", 32 J. of Optical Soc. of Am. 558, 558-619, (1942).
Patent & Trademark Office English Language Translation of German Patent 1,522,884 (Pub. Oct. 16, 1969).

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