| (19) |
 |
|
(11) |
EP 0 515 106 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
17.02.1993 Bulletin 1993/07 |
| (43) |
Date of publication A2: |
|
25.11.1992 Bulletin 1992/48 |
| (22) |
Date of filing: 15.05.1992 |
|
| (51) |
International Patent Classification (IPC)5: G03C 1/035 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB NL |
| (30) |
Priority: |
20.05.1991 JP 143895/91
|
| (71) |
Applicant: KONICA CORPORATION |
|
Tokyo 163 (JP) |
|
| (72) |
Inventors: |
|
- Matsuzaka, Shoji,
c/o Konica Corporation
Hino-shi,
Tokyo (JP)
- Ishikawa, Sadayasu,
c/o Konica Corporation
Hino-shi,
Tokyo (JP)
- Honta, Yasuo,
c/o Konica Corporation
Hino-shi,
Tokyo (JP)
|
| (74) |
Representative: Simpson, Alison Elizabeth Fraser et al |
|
Urquhart-Dykes & Lord,
91 Wimpole Street
London W1M 8AH
London W1M 8AH (GB) |
|
| |
|
| (54) |
Silver halide emulsion and silver halide photographic light sensitive material |
(57) Disclosed is a silver halide emulsion comprising a dispersion medium and silver halide
grain which contain;
(a) tabular-shaped silver halide grains having an aspect ratio within the range of
3.0 to 7.0, occupy at least 50 % of the whole projective area of the silver halide
grains in the emulsion; and
(b) hexagonal tabular-shaped silver halide grains each bearing even number of the
twinned crystal faces parallel to a principal face having a maximum adjacent side
ratio within the range of 2.0 to 1.0, occupy at least 70 % of the whole projective
area of the silver halide grains wherein said tabular-shaped silver halide grains
have a grain-size variation coefficient within the range of 21 to 29 % and a thickness
variation coefficient of not more than 20 %. A silver halide photographic light sensitive
material according to this invention is improved both in image-sharpness and pressure
characteristics.