Photodevelopable silver halide photosensitive material
AssigneeOriental Photo Industrial Co., Ltd.
InventorsMasahiro Kato, Shoichiro Sumi, Shoji Iwata
Life of this patent
Estimating the term…
Abstract
A photodevelopable silver halide photosensitive material wherein a visible image is formed by a latent image-forming step in which high illumination exposure is effected for a short time and a subsequent light development step in which low illumination exposure is effected, which comprises at least one compound of the formula: ##STR1## wherein R.sub.1 is hydrogen, lower alkyl or a substituted or unsubstituted aryl group and salts thereof.
Claims19
In a photodevelopable silver halide photosensitive material wherein a visible image is formed by a latent image-forming step in which high intensity light exposure is effected for a short time and then a subsequent light development step is effected using low intensity light exposure, the improvement which comprises:
- said photosensitive material contains, as a halogen acceptor, from 0.3 to 2.0 molar %, based on the silver halide, of one or a mixture of two or more compounds of the formula ##STR7## wherein R.sub.1 is hydrogen, lower alkyl, unsubstituted aryl or substituted aryl, and salts thereof.
A photodevelopable silver halide photosensitive material wherein a visible image is formed by a latent image-forming step wherein high intensity light exposure is effected for a short time and then a subsequent light development step is effected using low intensity light exposure, the improvement which comprises:
- an element of said photosensitive material contains, as a halogen acceptor, from 0.3 to 2.0 molar %, based on the silver halide, of one or a mixture of two or more compounds having the formula ##STR8## wherein R.sub.1 is hydrogen, lower alkyl, unsubstituted aryl or substituted aryl, and also contains one or a mixture of two or more sensitizing dyes having the formula ##STR9## wherein ##STR10## is a non-metal atomic group that completes a five-membered or six-membered heterocyclic ring, Z.sub.2 is sulfur or >NR.sub.5, wherein R.sub.5 is hydrogen, substituted alkyl, unsubstituted alkyl, unsubstituted aryl or substituted aryl, R.sub.2 is substituted alkyl or unsubstituted alkyl, R.sub.3 is substituted alkyl, unsubstituted alkyl, unsubstituted aryl, substituted aryl, alkenyl or hydrogen, R.sub.4 is hydrogen, alkyl, unsubstituted aryl or substituted aryl, and n is a number of 0, 1 or 2.
Dependencies are inferred from the claim text.