Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2002-01-31
2003-11-04
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S543000, C430S556000, C430S557000, C430S552000, C430S553000, C430S558000, C430S546000, C430S510000, C430S512000, C430S931000
Reexamination Certificate
active
06641988
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a photographic element and a silver halide photographic light sensitive material (hereinafter, also denoted simply as a photographic material) and in particular to a photographic element and a silver halide photographic material exhibiting improved color reproducibility, specifically, expanded color gamut of obtained dye images and enhanced suitability for a light source used for visual appreciation of dye images.
BACKGROUND OF THE INVENTION
Recently, various color imaging systems have become popular, including a silver halide photographic system, electrophotography, ink-jet printing and thermal transfer recording. Consumers demands for image qualities of silver halide photographic materials superior in productivity to other imaging systems have increased from year to year. Demand for high image quality include improvements in color reproduction, tone reproduction and sharpness. Specifically, with regard to color reproduction, there have been studies on improvements in spectral absorption characteristics of yellow, magenta and cyan dyes.
In the conventional design of spectral absorption characteristic of dyes, it was common to allow yellow dyes to have an absorption maximum in the vicinity of 450 nm, magenta dyes to have an absorption maximum in the vicinity of 550 nm and cyan dyes to have an absorption maximum in the vicinity of 650 nm. Thus, it was a general practice to maintain the difference in &lgr;max between respective dyes to be an extent of 100 nm. Thereby, preferable yellow, magenta and cyan colors were maintained and shifting this balance to a larger extent was shown to cause failure in color. Recently, however, it was also proved that only such design philosophy was insufficient to achieve satisfactory color reproduction and there have been attempted various designs.
JP-A No. 63-153546 (hereinafter, the term, JP-A refers to an unexamined, published Japanese Patent Application) proposed a technique for controlling wavelengths of absorption maximums (&lgr;max) of yellow, magenta and cyan dyes to expand the color gamut of obtained dye images and to minimize dependency on light sources used for visual appreciation of dye images. Thus, it was described in this disclosure that the spectral absorption band of the magenta dye was narrowed and the wavelength of the absorption maximum of the dye was fixed within an intended region. However, it was proved that when using a pyrazoloazole type magenta coupler satisfying the spectral absorption maximum taught in this disclosure, appearance of gray images were markedly varied under different light sources, i.e., dependence on a light source for visual appreciation was increased.
It is generally known that narrowing the spectral absorption band of an individual dye is advantageous to expand the color gamut but it also disadvantageously results in an increase of dependency on light sources for visual appreciation. It has therefore been considered to satisfy both criteria.
JP-A No. 10-83046 proposed a technique, in which narrowing an absorption band of a cyan dye was achieved by the use of a specified cyan coupler, thereby leading to expanded color gamut. However, it was proved that a balance of spectral absorptions of yellow, magenta and cyan dyes was not taken into account so that this technique was insufficient to achieve desired improvements.
SUMMARY OF THE INVENTION
In view of the foregoing, accordingly, it is an object of the present invention to provide a photographic element and a silver halide photographic material, which are superior in color reproduction, specifically in color gamut and suitability for a light source used in visual appreciation.
The foregoing object of the invention can be accomplished by the following photographic element and silver halide photographic material:
(1) A photographic element comprising a yellow dye forming coupler, a magenta dye forming coupler and a cyan dye forming coupler, wherein spectral reflection absorption characteristics of a yellow dye, a magenta dye and a cyan dye which are formed of the yellow dye forming coupler, the magenta dye forming coupler and the cyan dye forming coupler, respectively, meet the following requirements:
110≧&lgr;max(
M
)−&lgr;max(
Y
)≧95,
80≧&lgr;max(
C
)−&lgr;max(
M
)≧70,
0.43
≧Abs
600
(
M
)≧0.38,
and
0.48
≧Abs
550
(
C
)≧0.35,
wherein &lgr;max(Y) is a wavelength at an absorption maximum of the formed yellow dye, &lgr;max(M) is a wavelength at an absorption maximum of the formed magenta dye and &lgr;max(C) is a wavelength at an absorption maximum of the formed cyan dye; Abs
600
(M) is an absorbance at a wavelength of 600 nm of the magenta dye having 1.0 of an absorbance at the absorption maximum and Abs
550
(C) is an absorbance at a wavelength of 550 nm of the cyan dye having 1.0 of an absorbance at the absorption maximum;
(2) A photographic element comprising a yellow dye forming coupler, a magenta dye forming coupler and a cyan dye forming coupler, wherein spectral reflection absorption characteristics of a yellow dye, a magenta dye and a cyan dye which are formed of the yellow dye forming coupler, the magenta dye forming coupler and the cyan dye forming coupler, respectively, meet the following requirements:
108≧&lgr;max(
M
)−&lgr;max(
Y
)≧100,
80≧&lgr;max(
C
)−&lgr;max(
M
)≧70,
0.42
≧Abs
600
(
M
)≧0.40,
and
0.46
≧Abs
550
(
C
)≧0.35,
wherein &lgr;max(Y) is a wavelength at an absorption maximum of the formed yellow dye, &lgr;max(M) is a wavelength at an absorption maximum of the formed magenta dye and &lgr;max(C) is a wavelength at an absorption maximum of the formed cyan dye; Abs
600
(M) is an absorbance at a wavelength of 600 nm of the magenta dye having 1.0 of an absorbance at the absorption maximum and Abs
550
(C) is an absorbance at a wavelength of 550 nm of the cyan dye having 1.0 of an absorbance at the absorption maximum;
(3) A reflection-type or transmission-type silver halide photographic light sensitive material comprising on a refection or transmission support a blue-sensitive silver halide emulsion layer containing a yellow dye forming coupler, a green-sensitive silver halide emulsion layer containing a magenta dye forming coupler and a red-sensitive silver halide emulsion layer containing a cyan dye forming coupler, wherein spectral reflection absorption characteristics of a yellow dye, a magenta dye and a cyan dye which are formed of the yellow dye forming coupler, the magenta dye forming coupler and the cyan dye forming coupler, respectively, meet the following requirements:
110≧&lgr;max(
M
)−&lgr;max(
Y
)≧95,
80≧&lgr;max(
C
)−&lgr;max(
M
)≧70,
0.43
≧Abs
600
(
M
)≧0.38,
and
0.48
≧Abs
550
(
C
)≧0.35,
wherein &lgr;max(Y) is a wavelength at an absorption maximum of the formed yellow dye, &lgr;max(M) is a wavelength at an absorption maximum of the formed magenta dye and &lgr;max(C) is a wavelength at an absorption maximum of the formed cyan dye; Abs
600
(M) is an absorbance at a wavelength of 600 nm of the magenta dye having 1.0 of an absorbance at the absorption maximum and Abs
550
(C) is an absorbance at a wavelength of 550 nm of the cyan dye having 1.0 of an absorbance at the absorption maximum;
(4) A reflection-type or transmission-type silver halide photographic light sensitive material comprising on a refection or transmission support a blue-sensitive silver halide emulsion layer containing a yellow dye forming coupler, a green-sensitive silver halide emulsion layer containing a magenta dye forming coupler and a red-sensitive silver halide emulsion layer containing a cyan dye forming coupler, wherein spectral reflection absorption characteristics of a yellow dye, a magenta dye and a cyan dye which are formed of the yellow dye forming coupler, the magenta dye forming coupler and the cyan dye forming coupler, respectively, meet the following requirements:
108≧&lgr;max(
M
)−&lgr;max(
Y
)≧100,
80≧&lgr;max(
C
)−&lgr;max(
M
)≧70,
0.42
≧A
Konica Corporation
Letscher Geraldine
Muserlian Lucas and Mercanti
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