Fuji Photo Film Company, Limited

Fujifilm Corporation

Takeshi Suzumoto

Takanori Hioki

Katsumi Kobayashi

Hiroshi Kawakami

Ryo Suzuki

Tadashi Ikeda

Kohzaburoh Yamada

Tadashi Inaba

Naoto Ohshima

Mikio Ihama

Shigeharu Urabe

Katsuhiro Yamashita

Shinichi Ichikawa

Yasutomo Kawanishi

Takeshi Funakubo

Yasushi Tanabe

A silver halide emulsion comprising silver halide grains covered with two dye layers in combination. The two dye layers comprises an inner dye layer adjoining to the silver halide grain, and containing at least one sensitizing dye capable of spectrally sensitizing silver halide, and an outer dye layer adjoining to the inner dye layer, and containing at least two dyes. The light absorption energy of the outer dye layer is equal to or higher than that of the inner dye layer, an energy-releasing wavelength of the outer dye layer overlaps with an energy-absorbing wavelength of the inner dye layer, the sensitizing dyes constituting the inner dye layer include an anion and/or betaine dyes, the dyes constituting the outer dye layer include an anion and cation dyes, and the anion dye is more than the cation dye in terms of an addition amount and/or an adsorption amount.

Silver halide emulsion, method of preparing the same and silver halide photosensitive material using the same

A high-sensitivity silver halide photographic light-sensitive material is provided, which is a silver halide photographic light-sensitive material, in which a dye chromophore is adsorbed in multiple layers on the surface of a silver halide grain and at least one of the dye chromophore-containing compounds satisfies: a specific condition relating to the aggregation property, hydrophilicity/hydrophobicity or J-aggregation property; or a specific structure.

Silver halide photographic light-sensitive material

The present invention provides a black and white photothermographic material having, on at least one side of a support, an image forming layer containing at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for silver ions, and a binder, as well as an image forming method. The black and white photothermographic material is characterized in that 1) the non-photosensitive organic silver salt includes at least one compound selected from the group consisting of a silver salt of an azole compound and a silver salt of a mercapto compound, and 2) the photosensitive silver halide has a spectral sensitizing dye in the form of a multilayer adsorbed on its surface. According to the invention, an improved black and white photothermographic material and image forming method realizing high sensitivity, favorable gradation, and less dependence on developing process conditions are provided.

Black and white photothermographic material and image forming method

A silver halide emulsion containing water, dispersion medium comprising modified gelatin whose amino group is chemically modified, and silver halide grains comprising spectrally sensitized silver halide grains each having a multilayer adsorption of dye chromophores on the surface thereof. A method of preparing the silver halide emulsion. A silver halide photosensitive material contains the silver halide emulsion in a light-sensitive silver halide emulsion layer thereof.

Silver halide emulsion and method of preparing the same

A process for producing a spectrally sensitized silver halide photographic emulsion having high sensitivity. A process for producing a silver halide photographic emulsion comprising as a sensitizing dye at least one connection dye having two or more chromophores connected through a covalent bond, the process comprising adding said connection dye to a silver halide photographic emulsion and allowing at least one chromophore out of a plurality of chromophores in the molecule of the connection dye to change in the adsorption strength to a silver halide grain; and a process for producing a silver halide photographic emulsion comprising a silver halide grain having adsorbed on the surface thereof a sensitizing dye in multiple layers, the process comprising adding one or a plural of sensitizing dye(s) to said silver halide emulsion and allowing at least one sensitizing dye out of added sensitizing dyes to change in the adsorption strength to a silver halide grain.

Production process of silver halide photographic emulsion and silver halide photographic light-sensitive material

Disclosed is a silver halide photographic material having at least one silver halide emulsion layer containing a silver halide photographic emulsion, wherein the silver halide photographic emulsion comprises spectrally sensitized tabular silver halide grains having an average aspect ratio of from 8 to 100, and having light absorption strength by a sensitizing dye per unit surface area of the grain surface of 100 or more.

Silver halide photographic material

A silver halide photographic light-sensitive material is disclosed containing at least one methine compound represented by formula (I) or (III). Further disclosed is the methine compound represented by formula (I).

Methine compound and silver halide photographic light-sensitive material

A silver halide photographic material having provided on a support, at least one red sensitive emulsion layer comprising a silver halide emulsion having a silver chloride content of from 90 to 100 mol % and spectrally sensitized by a red sensitizing dye having a reduction potential at a value of -1.27 (V vs SCE) or more negative and a nitrogen-containing heterocyclic compound, exhibits reduced fluctuation in photographic sensitivity depending on the change in the printing temperature and reduced fluctuation in photographic sensitivity due to long term storage under the normal condition.

Growing community of inventors

Kanagawa, Japan

Takeshi Suzumoto