Fuji Photo Film Company, Limited

Shingo Nishiyama

Yoshihiro Takagi

Nobuaki Inoue

Satoru Sawada

Morio Yagihara

Kazunobu Katoh

Takanori Hioki

Hisashi Okada

Noriyuki Inoue

Yasuo Mukunoki

Masakazu Yoneyama

Toyohisa Oya

Kiyoshi Kawai

Tetunori Matushita

Naomi Saeki

Kazunori Hayashi

Isao Oyagi

A direct-positive silver halide light-sensitive material comprising a support having thereon at least one pre-fogged light-sensitive silver halide emulsion layer, wherein the light-sensitive material comprises a specific onium salt compound in the emulsion layer or a hydrophilic protective colloid layer adjacent thereto. Also disclosed is a method of preparing a pre-fogged light-sensitive silver halide emulsion for use in the light-sensitive material.

Pre-fogged direct-positive silver halide photographic light-sensitive

A direct positive type silver halide photographic material is described, which contains at least one compound represented by the following formula (I) and at least one cyanine dye having a pyrazolo[5,1-b]quinazolone nucleus and a cyanine heterocycle nucleus, wherein a carbon atom at 3-position of the pyrazolo[5,1-b]quinazolone nucleus is bonded through a four-methine chain to an atom at the 2-position or 4-position of the cyanine heterocycle nucleus, provided that the 4-position is possible only when the cyanine heterocycle nucleus is a quinoline or pyridine nucleus: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents an alkyl group, an aryl group or a heterocyclic group, which may be substituted; V.sub.1, V.sub.2, V.sub.3, V.sub.4, V.sub.5, V.sub.6, V.sub.7 and V.sub.8 each represents a hydrogen atom or a monovalent substituent; L.sub.1, L.sub.2 and L.sub.3 each represents a substituted or unsubstituted methine group; M.sub.1 represents a charge-neutralizing counter ion; and m.sub.1 is a number of 0 or larger necessary for intramolecular charge neutralization.

Direct positive type silver halide photographic material comprising a

A silver halide photosensitive material comprising a support having thereon a photosensitive layer comprising at least one silver halide emulsion layer and with a total silver coating amount of silver halide of 2.5 g/m.sup.2 or less, and wherein at least one of the layers of the photosensitive material contains a surfactant containing a (poly)glycerol group.

Silver halide photosensitive material

A silver halide photographic material comprising one or more silver halide emulsion layers and hydrophilic colloid layers, wherein at least one of the layers contains an acylhydrazine compound as described below. The instant photographic materials have high contrast negative-gradation or positive-gradation characteristics, high maximum image density, excellent reversal characteristics and long-term storage stability.

Silver halide photographic materials

A silver halide photographic material for reversal processing is disclosed, which comprises a support having provided thereon at least one hydrophilic colloidal layer, the hydrophilic colloidal layer being a light-sensitive silver halide emulsion layer, silver halide grains of the silver halide emulsion being of a core/shell structure comprising a core portion substantially composed of silver bromide and said shell portion substantially composed of silver bromoiodide.

Silver halide photographic material for reversal processing

A method of forming a direct positive image comprising: (a) imagewise exposing a direct positive silver halide photographic material composed of a support having thereon at least one light-sensitive silver halide emulsion layer containing non-prefogged internal latent image silver halide grains, at least one hydrophilic colloidal layer of the material containing a nucleating agent, and at least one sensitizing dye represented by formulae (I), (Ia), (Ia'), or (Ib): ##STR1## wherein Z and Z.sub.1 each represents a non-metallic atomic group necessary for forming a 5-membered or 6-membered nitrogen-containing heterocyclic ring; R and R.sub.1 each represents a substituted or unsubstituted alkyl group or an aryl group; Q and Q.sub.1 represent a non-metallic atomic group necessary for forming together a 4-thiazolidinone group, a 5-thiazolidinone group or a 4-imidazolidinone group; L, L.sub.1 and L.sub.2 each represents a methine group or a substituted methine group; n.sub.1 and n.sub.2 each is 0 or 1; X represents an anion; and m is 0 or 1; ##STR2## wherein R.sub.21 and R.sub.22 each represents a substituted or unsubstituted alkyl group; R.sub.20 represents hydrogen, a methyl group, a methoxy group or an ethoxy group; R.sub.23 and R.sub.24 each represents hydrogen, a lower alkyl group, a phenyl group or a benzyl group; R.sub.25 represents hydrogen, a lower alkyl group, a lower alkoxy group, a phenyl group, a benzyl group or ##STR3## wherein W.sub.1 and W.sub.2 each represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group, and W.sub.1 and W.sub.2 may be linked to form a 5-membered or 6-membered nitrogen-containing heterocyclic ring; D.sub.20 represents a substituted or unsubstituted group containing at least one ethylene bond; D.sub.21 and D.sub.22 each represents hydrogen or a group containing an ethylene bond, when D.sub.21 and D.sub.22 are linked to form a ring; Z.sub.20 and Z.sub.21 each represents a non-metallic atomic group necessary for forming a 5- membered or 6-membered nitrogen-containing heterocyclic ring; X' represents an acid anion; and n' is 1 or 2; ##STR4## wherein R.sub.36 and R.sub.37 each has the same definition as R.sub.21 ; R.sub.38 has the same definition as R.sub.23 ; V represents hydrogen, a lower alkyl group, an alkoxy group, a halogen atom, or a substituted alkyl group; Z.sub.32 has the same definition as R.sub.20 ; X.sub.1 has the same definition as X; and m.sub.1, n.sub.1 and p is each 1 or 2 and (b) developing said exposed material in the presence of a nucleation accelerator to form a positive image.

Method for forming a direct positive image

An ultra-high contrast silver halide photographic material which is suitable for daylight use and which has at least one silver halide emulsion layer on a support, wherein the emulsion layer contains cubic silver halide grains having a mean grain size of 0.15 .mu.m or less and containing silver chloride in an amount of 99 mol % or more. The material can contain a rhodium salt or an organic desensitizer for lowering the sensitivity while maintaining the high contrast photographic property thereof.

An ultra-high contrast silver halide photographic material which is suitable for daylight use and which has at least one silver halide emission layer on a support, wherein the emulsion layer contains cubic silver halide grains having a mean grain size of 0.15 .mu.m or less and containing silver chloride in an amount of 99 mol % or more. The material can contain a rhodium salt or an organic desensitizer for lowering the sensitivity while maintaining the high contrast photographic property thereof.

A heat developable color photographic material is disclosed. The color photographic material is comprised of a support having thereon a light-sensitive mixed crystal silver haloiodide having a silver iodide content of 4 to 40 mole %, a binder and a dye-providing substance capable of providing a mobile dye, when the silver haloiodide is reduced to silver by heating, in chemical relation to the reaction. The color photographic material is capable of producing an image by quick development in a substantially water free state. Even when the color photographic material is used in combination with an organic silver salt it is capable of providing excellent color sensitivity.

Heat developable color photographic materials

A silver halide photographic material in which a silver iodobromide emulsion having an iodide content of 2 mole % or more and an organometallic salt functioning as a development inhibitor are employed in combination, whereby an improvements in graininess and sharpness of a developed image are achieved and high photographic speed is retained. A process for producing silver images using the silver halide photographic material is also disclosed.

High speed silver halide photographic materials

A silver halide photographic emulsion containing silver halide grains, the surface of which is a (110) crystal plane substantially composed of silver bromide or silver iodobromide is disclosed. A process for producing a silver halide photographic emulsion containing silver halide grains the surface of which is substantially composed of silver bromide or silver iodobromide, which comprises performing growth of the silver halide grains in an aqueous medium in the presence of a hydrophilic protective colloid and a compound accelerating the development of a (110) crystal plane is also disclosed.

Growing community of inventors

Kanagawa, Japan

Shingo Nishiyama