Konica Corporation

Kazuyoshi Ichikawa

Haruhiko Masutomi

Shinichi Suzuki

Chikao Mamiya

Yumiko Nimura

Hideaki Kimura

Sanae Oyama

Satoshi Ito

Hiroshi Kashiwagi

Hirofumi Ohtani

Hiroaki Ando

Naoko Furusawa

Yusuke Kawahara

Naoko Uchida

Tetsuya Yoshida

Chikao Mimiya

Masako Kuramoto

A silver halide grain is disclosed, having one or more chemical sensitization clusters, and a largest size of the clusters being not less than 1.2 nm and less than 4.0 nm in diameter. A silver halide emulsion containing silver halide grains, as above-described and a preparation method are also disclosed.

Silver halide grain, silver halide emulsion and preparation method

A light spectrum measuring apparatus comprises a sensor case on which a window with a glass is provided; a light emitting member and a light receiving member both provided in the case so that light emitted from the light emitting member passes through the glass, is reflected from solution, returns in the case, and is received by the light receiving member, wherein the glass, the light emitting member and the light receiving member are arranged in such a positional relation that positive reflected light which is emitted from the light emitting member and directly reflected by the glass without proceeding in the solution, is not received by the light receiving member.

Measuring sensor, diffuse reflectance spectrum measuring method using

A method for chemically sensitizing a silver halide photographic emulsion with a selenium compound is disclosed. The sensitizing method comprises the steps of

Method for chemically sensitizing silver halide photographic emulsion

Disclosed is a method of producing a silver halide photographic emulsion comprising steps of:

Method of producing a silver halide photographic emulsion

A desalting method of a silver halide emulsion is disclosed, comprising removing soluble salts from the silver halide emulsion by electrodialysis, wherein said electrodialysis is carried out at a pH within a range of .+-.0.5 of an isoelectric point of a gelatin contained in the silver halide emulsion. Furthermore, by adding a salt during the course of the electrodialysis, the concentration of the emulsion is accomplished concurrently with desalting thereof.

Method for desalting silver halide emulsion and silver halide emulsion

A method for manufacturing an ultrafine gold and/or silver chalcogenide being used for the sensitivity speck seeding sensitization method is disclosed. The gold and/or silver compound, and a water-soluble chalcogenide are mixed into a protective colloid solution under prescribed condition. The light-sensitive photographic material obtained by this method has a high sensitivity and low fog property.

Ultrafine gold and/or silver chalcogenide and production thereof

A method for making a photographic composition gel ready for use in production from a good preservative frozen state, causing no change in photographic properties, wherein a photographic composition gel is melted to a sol by placing a light shielding dielectric preservative container holding lumps of a photographic composition gel in a dielectric heating apparatus which generates high frequencies capable of penetrating to a depth corresponding to the size of the above photographic composition gel lumps, and melting the photographic composition gel to a sol by irradiating the lumps of gel with the above high frequencies from the outside of the container.

Method for melting a photographic composition gel to a sol using

A method of preparing silver halide grains for a photographic emulsion which has a constant mass production qualities and a controlled crystalization technique is disclosed. The first reaction of halides and silver is performed in a mixer with a blades of high speed then the fine crystals of silver halide are kept in an adjusting vessel where monitoring and control devices are provided and the fine crystals are supplied to a parent tank for ripening the crystals prepared in the parent tank.

Method of preparing silver halide grains for photographic emulsion and

An organic solvent having a boiling point lower than that of water is removed from liquid containig water and the organic solvent contained in a tank by exhausting air in the tank, wherein an air pressure in the tank is kept about vapor pressure level of the liquid.

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Hino, Japan

Kazuyoshi Ichikawa