Abstract: A photo sensitive emulsion disclosed, comprising an organic silver salt, a photosensitive silver halide and a dispersing medium, wherein the organic silver salt is comprised of at least a first organic silver salt grains and a second organic silver salt grains which are different in average grain size from each other. A photothermographic material containing is also disclosed.

Abstract: A silver salt photothermographic dry imaging material wherein said material has photographic speeds (1) and (2) determined based on the predetermined conditions and the photographic speed (2) is not more than {fraction (1/10)} of the photographic speed (1), and the coefficient of determination value R2 of the linear regression line is 0.998-1.000, which is obtained from the predetermined density points having a* and b* arranged in two-dimensional coordinates in which a* is used as the abscissa and b* is used as the coordinate of the CIE 1076 (L*a*b*) color space, b* of the intersection point of the linear regression line with the ordinate is ?5-5, and gradient (a*/b*) is 0.7-2.5.

Abstract: The present invention relates to an optical element for an optical pickup device, wherein the optical element is produced by molding a resin material, in which inorganic particles having a diameter of not more than 30 nm are dispersed in a plastic resin, an optical pickup device using the optical element, and a producing method of the optical element.

Abstract: A photo sensitive emulsion disclosed, comprising an organic silver salt, a photosensitive silver halide and a dispersing medium, wherein the organic silver salt is comprised of at least a first organic silver salt grains and a second organic silver salt grains which are different in average grain size from each other. A photothermographic material containing is also disclosed.

Abstract: A silver halide photographic emulsion, wherein silver halide grains are prepared by adding a compound capable of forming cross-linkage with gelatin to said silver halide grains in any of processes before the completion of chemical sensitization after the formation of the silver halide grains.

Abstract: A method for preparing a silver halide emulsion comprising silver halide grains is disclosed, comprising: reacting a silver salt solution and a halide salt solution to perform silver halide grain nucleation, followed by silver halide grain growth to form the silver halide grains, wherein the silver halide grains are formed in the presence of an iodide ion releasing agent; and subjecting a reaction mixture solution to ultrafiltration during grain growth.

Abstract: A silver halide photographic emulsion is provided, wherein the silver halide emulsion contains silver halide grains having an average iodide content of less than 3 mol %, the silver halide grains comprising monodispersed core/shell type silver halide grains containing internally high iodide, the core/shell grains having two parallel twin planes and a substantially roundish hexahedral or tetradecahedral form.