发明授权
US4994364A Direct positive image forming method 失效
直接正成像法

Direct positive image forming method
摘要:
A direct positive image forming method comprising development processing an imagewise exposed direct positive photographic light-sensitive material which comprises a support having thereon at least one layer containing internal latent image type silver halide grains not having been previously fogged after fogging treatment or while fogging treatment, wherein the fogging treatment is conducted in the presence of a compound represented by the following general formula (I): ##STR1## wherein A.sub.1 and A.sub.2 both represent a hydrogen atom or one of A.sub.1 and A.sub.2 represents a hydrogen atom and the other represents a sulfonyl group or an acyl group; G.sub.1 represents a carbonyl group, a sulfonyl group, a sulfoxy group, ##STR2## or an iminomethylene group; L.sub.1 represents a divalent linkage group; X.sub.1 represents --O-- or ##STR3## wherein R.sub.4 represents a hydrogen atom, an alkyl group or an aryl group); Y.sub.1 represents ##STR4## R.sub.1 and R.sub.2 each represents an aliphatic group, an aromatic group, a heterocyclic group, --OR.sub.5 or --NR.sub.5 R.sub.6 (wherein R.sub.5 represents an aliphatic group, an aromatic group or a heterocyclic group; and R.sub.6 represents a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group); and R.sub.3 represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aralkyl group, an aryloxy group or an amino group.In accordance with the method of the present invention direct positive images having a high maximum image density and a low minimum image density and being stable even when preserved under high temperature and high humidity conditions.
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