Silver halide emulsion, method of manufacturing the emulsion, silver halide photosensitive material containing the emulsion, and method of developing the material
US6306569A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Mar 3, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/035
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide emulsion containing chemically sensitized silver halide grains, wherein the silver halide grains are prepared by ripening the grains by the addition of (1) fine silver halide grains smaller than the silver halide grains to be digested, (2) a solution containing silver ions, (3) a solution containing halide ions and a solution containing silver ions, or (4) a fine silver halide grain emulsion and a solution containing silver ions, wherein the amount of the addition in terms of silver ion is 0.05 to 8 mol % per mol of silver in the silver halide grains, and the addition is performed after 40% or more of the reaction of chalcogen sensitizer that is added during the chemical sensitization step is completed and before the silver halide grains are optimally ripened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.