Developing apparatus

Details Developing apparatus Developing apparatus

1989-08-04

1990-05-29

Mathews, A. A.

354320, 354324, G03D 302

Patent

active

049299743

ABSTRACT:
A developing apparatus provided with a circulation apparatus comprising an apparatus for discharging a processing solution for photosensitive material contained in a developing tank, and an apparatus for supplying the discharged processing solution to inside the developing tank. The supply apparatus is made up of a first processing solution supply apparatus that supplies a part of the discharged processing solution to the developing tank through a first apparatus for adjusting a supply amount of the processing solution, and a second processing solution supply apparatus with a processing solution guiding apparatus that flushes a part of the discharged processing solution onto the surface of the photosensitive material while being conveyed inside the developing tank, through a second valve apparatus for adjusting a supply amount of the processing solution.
The first and second valve apparatus are controlled so that immediately after changing all the processing solution in the developing tank, and after supplying of a predetermined amount of replenishment solution, the ratio of the circulation amount of the first processing solution supply apparatus to the second processing solution supply apparatus is changed.
As a result the operating conditions such as processing speed etc. can be constant and the degree of progress of development of the photosensitive material is controlled. Consequently a stabilized contrast of the photosensitive material can be obtained from immediately after replacing the processing solution with new processing solution.

REFERENCES:
patent: 3311039 (1967-03-01), Lucas
patent: 4104668 (1978-08-01), Laar
patent: 4512645 (1985-04-01), Engelhardt et al.
patent: 4758858 (1988-07-01), Blackman

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