# US 5,702,878 A · Silver halide photographic emulsion and photographic material using the same

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- Number: US 5,702,878 A
- Document ID: US5702878A
- Status: Granted
- Kind: A
- Application number: 08/516,552
- Filed: 1995-08-18
- Granted: 1997-12-30
- Earliest claimed: 1994-08-22
- Assignees: Fuji Photo Film Co., Ltd.
- Inventors: Yoichi Maruyama
- Web page: https://patentgrep.com/patent/US5702878A

## CPC

- G03C 1/0051: {Tabular grain emulsions}
- G03C 2001/0056: {Disclocations}
- G03C 2001/0357: {Monodisperse emulsion}
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

A silver halide photographic emulsion is disclosed, comprising silver halide tabular grains having integrated therein dislocation lines and having an aspect ratio of 1.5 or more and a circle-corresponding diameter of 0.6 .mu.m or less, wherein the grains having integrated therein dislocation lines from the site determined by the following expression (I) occupy 50% or more of the total projected area: D=(1.4S.sup.1.5).times.100.+-.15 (I) wherein D represents a ratio (%) of silver amount consumed until the integration of the dislocation lines to the total amount of silver used and S represents a sphere-corresponding diameter (.mu.m) of a final grain, provided that D is 5 or more.

## Claims

### Claim 1

A silver halide photographic emulsion comprising silver halide tabular grains having integrated therein dislocation lines and having an aspect ratio of 1.5 or more and a circle-corresponding diameter of 0.6 .mu.m or less, wherein said tabular grains occupy 50% or more of the total projected area and said dislocation lines begin at a site, D, based on the amount of silver, such that D satisfies the following expression (I):
D=(1.4S.sup.1.5).times.100.+-.15 (I)
wherein D represents a ratio (%) of silver amount consumed prior to the integration of the dislocation lines to the total amount of silver used and S represents a sphere-corresponding diameter (.mu.m) of a final grain, and D is at least 5.

### Claim 2 (depends on 1)

The silver halide photographic emulsion as claimed in claim 1, wherein at some time during the formation of said silver halide tabular grains, iodide ions were abruptly produced.

### Claim 3 (depends on 1)

The silver halide photographic emulsion as claimed in claim 1, wherein said dislocation lines begin at a site such that D satisfies the relationship:
D=(1.4S.sup.1.5).times.100.+-.10.

### Claim 4 (depends on 1)

The silver halide photographic emulsion as claimed in claim 1, wherein said dislocation lines begin at a site such that D satisfies the relationship:
D=(1.4S.sup.1.5).times.100.+-.5.

### Claim 5

A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, wherein said silver halide emulsion layer comprises a silver halide photographic emulsion which comprises silver halide tabular grains having integrated therein dislocation lines and having an aspect ratio of 1.5 or more and a circle-corresponding diameter of 0.6 .mu.m or less, wherein said tabular grains occupy 50% or more of the total projected area and said dislocation lines begin at a site, D, based on the amount of silver, such that D satisfies the following expression (I):
D=(1.4S.sup.1.5).times.100.+-.15 (I)
wherein D represents a ratio (%) of silver amount consumed prior to the integration of the dislocation lines to the total amount of silver used and S represents a sphere-corresponding diameter (.mu.m) of a final grain, and D is at least 5.

### Claim 6 (depends on 5)

The silver halide photographic material as claimed in claim 5, wherein at some time during the formation of said silver halide tabular grains, iodide ions were abruptly produced.

### Claim 7 (depends on 5)

The silver halide photographic material as claimed in claim 5, wherein said dislocation lines begin at a site such that D satisfies the relationship:
D=(1.4S.sup.1.5).times.100.+-.10.

### Claim 8 (depends on 5)

The silver halide photographic material as claimed in claim 5, wherein said dislocation lines begin at a site such that D satisfies the relationship:
D=(1.4S.sup.1.5).times.100.+-.5.