Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2001-03-29
2003-11-04
Baxter, Janet (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S503000, C430S504000, C430S506000, C430S544000
Reexamination Certificate
active
06641987
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-091212, filed Mar. 29, 2000, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a color photographic light-sensitive material and, more particularly, to a color photographic light-sensitive material having high color saturation in a wide exposure region.
Recently, the development of zoom compact cameras is being sought, and zoom cameras having high magnifications, e.g., three-fold zooming and four-fold zooming are most often used. These zoom cameras are useful to lightheartedly enjoy photographing, but the fact is that they are not always satisfactory in image quality. For example, some cameras have lens F values exceeding 10 at the telephoto end and often cause underexposure. Also, since the range of an electronic flash is short, the light cannot reach an object to cause underexposure in many instances.
Advanced Photo System (to be abbreviated as APS hereinafter) having a frame size smaller than that of the conventional 135 format was put on the market in 1996, and the miniaturization of cameras is progressing by using this small format. With this miniaturization of cameras, electronic flashes of some cameras are also downsized. Accordingly, the ratio of photographic failures caused by the inability of an electronic flash to reach an object are increasing in APS.
In recent years, high-speed light-sensitive materials have been put on the market one after another with the progress of photographic light-sensitive material technologies. Since high-speed-films can “photograph in dark places”, they are used in dark rooms more frequently. In Japan, fluorescent lamps are often used as room lamps, so portions illuminated by fluorescent lamps are printed in greenish colors. The higher the sensitivity of a film, the more strongly the film is influenced by a background light source. Hence, the frequency of appearance of greenish prints caused by fluorescent lamps is increased more by an ISO 400 film than an ISO 100 film, and by an ISO 800 film than an ISO 400 film. Fuji Photo Film Co., Ltd. has developed the “SUPER 400” color negative film having color reproduction faithful to human eyes, and thereby has improved the light source suitability of an ISO 400 film. In this film, faithful color reproduction is implemented by the fourth color-sensitive layer and by shortening the wavelength of the spectral sensitivity of a red-sensitive layer. It is readily possible to predict that the light source suitability of an ISO 800 film can be improved by applying these technologies to the film. However, introducing the fourth color-sensitive layer and shortening the wavelength of spectral sensitivity are disadvantageous from a sensitivity viewpoint. If this insufficient sensitivity is compensated for by increasing the grain size, the graininess deteriorates. Therefore, introducing these technologies to an ISO 800 film has been difficult.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a silver halide color photographic light-sensitive material by which photographs having high color saturation over a wide exposure region can be obtained even by a compact camera or a throwaway camera.
The present inventors made extensive studies and have found that the object of the present invention is achieved by the following means.
(1) A silver halide color photographic light-sensitive material comprising, on a support, a red-sensitive layer unit including at least one red-sensitive silver halide emulsion layer, a green-sensitive layer unit including at least one green-sensitive silver halide emulsion layer, and a blue-sensitive layer unit including at least one blue-sensitive silver halide emulsion layer, the light-sensitive material having an ISO sensitivity of not less than 640, wherein the material exhibits a color saturation evaluation value &eegr;, represented by equation (I) below, of not less than −15 dB:
&eegr;=10
log
(1/
V
T
)
[
V
T
=(⅙)×((62−
Y
1
)
2
+(62−
Y
2
)
2
+(62−
Y
3
)
2
+(62−
Y
4
)
2
+(62−
Y
5
)
2
+(62−
Y
6
)
2
)] (I)
where each of Y1 to Y6 is a value obtained by exposing 12 colors of a Macbeth color chart with six exposure amounts, from −1 under to +4 over, measuring the saturation of each resultant color, and averaging the data (chroma values) for a corresponding exposure amount.
(2) The silver halide color photographic light-sensitive material described in (1), wherein a weight-average wavelength &lgr;
R
, represented by equation (II) below, of the red-sensitive silver halide emulsion layer is not more than 625 nm:
λ
R
=
∫
550
700
λ
S
R
(
λ
)
ⅆ
λ
∫
550
700
S
R
(
λ
)
ⅆ
λ
(
II
)
where S
R
(&lgr;) is the spectral sensitivity distribution curve of the red-sensitive silver halide emulsion layer, and SR at a specific wavelength &lgr; is represented by the reciprocal of an exposure amount by which a cyan density is fog +0.5 when exposed to the specific wavelength.
(3) The silver halide color photographic light-sensitive material described in (2), wherein the weight-average wavelength &lgr;
R
of the red-sensitive silver halide emulsion layer is 600 to 620 nm.
(4) The silver halide color photographic light-sensitive material described in (1), wherein 50% or more of the total projected area of silver halide grains contained in at least one of highest-sensitivity emulsion layer in the unit red-sensitive layer, highest-sensitivity emulsion layer in the unit green-sensitive layer and highest-sensitivity emulsion layer in the unit blue-sensitive layer are tabular silver halide grains having an average aspect ratio of 8 or more.
(5) The silver halide color photographic light-sensitive material described in (4), wherein the tabular silver halide grains have 10 or more dislocation lines per grain in average.
(6) The silver halide color photographic light-sensitive material described in (1), wherein the silver halide emulsion contained in at least one of the silver halide emulsion layers is subjected to selenium sensitization.
(7) The silver halide color photographic light-sensitive material described in (6), wherein the selenium sensitization is subjected by using at least one selected from compounds represented by formulas (A) and (B):
where each of Z
1
and Z
2
independently represents an alkyl group, an alkenyl group, an aralkyl group, an aryl group, a heterocyclic group, —NR
1
(R
2
), —OR
3
, or —SR
4
, each of R
1
, R
2
, R
3
, and R
4
independently represents a hydrogen atom, an alkyl group, an aralkyl group, an aryl group, a heterocyclic group, or an acyl group.
where each of Z
3
, Z
4
, and Z
5
independently represents an alkyl group, an alkenyl group, an alkinyl group, an aralkyl group, an aryl group, a heterocyclic group, —OR
7
, —NR
8
(R
9
), —SR
10
, —SeR
11
, X, or a hydrogen atom, each of R
7
, R
10
, and R
11
independently represents an alkyl group, an alkenyl group, an alkinyl group, an aralkyl group, an aryl group, a heterocyclic group, a hydrogen atom, or a cation, each of R
8
and R
9
independently represents an alkyl group, an alkenyl group, an alkinyl group, an aralkyl group, an aryl group, a heterocyclic group, or a hydrogen atom, and X represents a halogen atom.
(8) The silver halide color photographic light-sensitive material described in (1), wherein a weight-average sensitivity wavelength &lgr;
G
, represented by equation (III) below, of the spectral sensitivity distribution of the green-sensitive silver halide emulsion layer is 520 nm<&lgr;
G
≦580 nm, a weight-average wavelength (&lgr;
−R
) of the spectral sensitivity distribution of the interlayer effect, which the red-sensitive silver halide emulsion layer is given from other si
Ikoma Hideto
Okamoto Jun
Suga Yoichi
Baxter Janet
Fuji Photo Film Co. , Ltd.
Walke Amanda C.
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