Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Patent
1988-09-21
1990-07-03
Michl, Paul R.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
430503, 430506, 430567, 430574, G03C 146
Patent
active
049390783
ABSTRACT:
A direct positive type silver halide photographic material and developing method therefor are disclosed. The photographic material have blue-, green- and red-sensitive emulsion layers and each of these emulsion layer contains at least two kinds of silver halide emulsion being different from each other in average grain size. The average grain diameter S of the emulsion having the smallest average grain size and the average grain diameter of the emulsion having the largest average grain size in each emulsion layer have a proportional relation of 1.6.ltoreq.L/S. The emulsion having the smallest average grain size is contained in a ratio of from 2 to 50% in the blue-sensitive layer and 2 to 40% in green- and red-sensitive emulsion layer.
REFERENCES:
patent: 4306017 (1981-12-01), Baralle et al.
patent: 4749644 (1988-06-01), Tosaka et al.
patent: 4801520 (1989-01-01), Inoue et al.
Kuramoto Kazuya
Tosaka Yasuo
Ueda Bunzo
Bierman Jordan B.
Konica Corporation
Le Hoa Van
Michl Paul R.
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