Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2000-09-06
2002-10-08
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S567000, C430S570000, C430S572000, C430S581000, C430S583000, C430S599000, C430S603000, C430S604000, C430S605000
Reexamination Certificate
active
06461803
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 11-251428, filed Sep. 6, 1999, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a silver halide color photographic lightsensitive material. More particularly, the present invention relates to a color photographic lightsensitive material which is highly sensitive and has an excellent light source adaptability.
In recent years, highly sensitive lightsensitive materials have been placed on market in succession in accordance with the progress of the technology of photographic lightsensitive materials. Highly sensitive films are “usable for photographing in dark scenes”, so that the frequency of use thereof in dark indoor places is increasing. On the other hand, especially in Japan, fluorescent lamps are very often used as indoor illuminants, and scenes illuminated by fluorescent lamps are printed greenish. The higher the sensitivity of the film, the greater the influence of the background light source on the film. Accordingly, the occurrence of greenish printing attributed to fluorescent lamps is greater with ISO-400 films than with ISO-100 films and greater with ISO-800 films than with ISO-400 films. A means for improving the fluorescent lamp adaptability of such a highly sensitive film was reported at the 1999 annual general meeting of the Society of Photographic Science and Technology of Japan. However, the means relates to improvement in a mixed light from a three band fluorescent lamp and a strobe and is not satisfactory with respect to the photographing under a white fluorescent lamp or at indoor exposure without the use of any strobe.
On the other hand, Fuji Photo Film Co., Ltd. have developed color negative film “SUPER-400” realizing a color reproduction that is faithful to human sight and have improved the light source adaptability of ISO-400 film. This faithful color reproduction has been realized by the fourth color-sensitive layer and the regulation of the spectral sensitivity of the red-sensitive layer to a shorter wave. Although it can be easily anticipated to apply this technology to the ISO-800 film to thereby improve the light source adaptability thereof, the introduction of the fourth color-sensitive layer and the regulation of the spectral sensitivity to a shorter wave are disadvantageous from the viewpoint of sensitivity. Compensating for such a sensitivity insufficiency by increasing the grain size is detrimental to the graininess. Therefore, the introduction of the above technology in the ISO-800 film has not been easy.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a silver halide color photographic lightsensitive material which is highly sensitive and which realizes a faithful color reproduction, attaining minimization of, especially, greenishness attributed to fluorescent lamps.
The inventors have found, as a result of extensive and intensive efforts, that the object of the present invention can be attained by the following silver halide color photographic lightsensitive material.
EMBODIMENT 1
A silver halide color photographic lightsensitive material comprising at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one blue-sensitive silver halide emulsion layer on a support, wherein the lightsensitive material has an ISO speed of 640 or more and a variation, in terms of SN
GR
ratio, of magenta and cyan colors of 0 dB or more when the lightsensitive material was subjected to (1) white exposure, (2) white fluorescent lamp exposure and (3) three band fluorescent lamp exposure.
EMBODIMENT 2
The lightsensitive material defined in Embodiment 1, wherein the lightsensitive material has a variation, in terms of SN
BGR
ratio, of yellow, magenta and cyan colors of −4 dB or more when the lightsensitive material is subjected to (1) white exposure, (2) white fluorescent lamp exposure and (3) three band fluorescent lamp exposure.
EMBODIMENT 3
The lightsensitive material defined in Embodiment 2, wherein the blue-sensitive silver halide emulsion layer contains a sensitizing dye selected from a group consisting of sensitizing dyes represented by general formula (I) and general formula (II), and a sensitizing dye represented by general formula (III):
wherein each of R
3
and R
4
independently represents an alkyl group, an aryl group or a heterocyclic group; L
6
represents a methine group; M
2
represents a charge balancing counter ion; m
2
represents the number required for neutralizing a molecular charge; Q
1
represents an aromatic ring; each of V
1
and V
2
independently represents a monovalent substituent; n
1
represents 0, 1 or 2; and n
2
represents 0, 1, 2, 3 or 4;
wherein each of R
5
and R
6
independently represents an alkyl group, an aryl group or a heterocyclic group; L
7
represents a methine group; M
3
represents a charge balancing counter ion; m
3
represents the number required for neutralizing a molecular charge; each of V
3
and V
4
independently represents a monovalent substituent, provided that when M
3
is two or more, two of V
3
substituents do not bond with each other to thereby form an aromatic ring and when M
4
is two or more, two of V
4
substituents do not bond with each other to thereby form an aromatic ring; and each of n
3
and n
4
independently represents 0, 1, 2, 3 or 4; and
wherein each of R
7
and R
8
independently represents an alkyl group, an aryl group or a heterocyclic group; L
8
represents a methine group; M
4
represents a charge balancing counter ion; m
4
represents the number required for neutralizing a molecular charge; each of V
5
and V
6
independently represents a monovalent substituent; each of n
5
and n
6
independently represents 0, 1, 2, 3 or 4; and Z
3
represents an oxygen atom or a sulfur atom.
EMBODIMENT 4
The lightsensitive material defined in Embodiment 2, wherein the blue-sensitive silver halide emulsion layer contains at least one sensitizing dye represented by the above general formula (I), at least one sensitizing dye represented by the above general formula (II) and at least one sensitizing dye represented by the above general formula (III).
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below.
The fluorescent lamps can generally be classified into two types, white light fluorescent lamps and three band fluorescent lamps, and the energy distributions thereof vary from each other, depending on the manufacturer. Evaluating the film adaptability to fluorescent lamps on an individual basis wastes enormous labor and time, which is disadvantageous from the viewpoint of reducing the period for merchandise development.
There is few user of color negative film who employs different films according to the type of fluorescent lamp, so that the evaluation of individual. fluorescent lamp adaptability is meaningless to the users. Therefore, a method of collectively evaluating the fluorescent lamp adaptability (evaluation on the basis of SN ratio wherein the type of light source is regarded as noise) has been introduced for the purpose of reducing the period for merchandise research and effecting a development of lightsensitive materials meaningful to the users.
The SN
GR
ratio for evaluating the light source adaptability in the present invention can be calculated in the following manner.
The method of determining the evaluation value in the case where the data as given in Table 1 have been obtained from the characteristic curves regarding the densities of G (green) and R (red) obtained when exposures have been effected with the use of each of three types of light sources will be described below.
TABLE 1
G
R
N1
N2
N3
N1
N2
N3
Total
M1
Y11
Y12
Y13
Y14
Y15
Y16
X1
M2
Y21
Y22
Y23
Y24
Y25
Y26
X2
M3
Y31
Y32
Y33
Y34
Y35
Y36
X3
M4
Y41
Y42
Y43
Y44
Y45
Y46
X4
M5
Y51
Y52
Y53
Y54
Y55
Y56
X5
M6
Y61
Y62
Y63
Y64
Y65
Y66
X6
M7
Y71
Y72
Y73
Y74
Hioki Takanori
Okamoto Jun
Suga Yoichi
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Letscher Geraldine
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