Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2000-07-21
2002-02-12
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S506000, C430S507000, C430S502000, C430S503000, C430S379000
Reexamination Certificate
active
06346368
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to silver halide light sensitive color reversal photographic materials improved in image quality, specifically suitable for nature photography, and in particular to silver halide color reversal photographic materials which are improved in graininess, sharpness, color reproduction and camera speed so as to be suitable for capturing images of nature.
BACKGROUND OF THE INVENTION
Recently, silver halide color photographic materials have made marked enhancement in image quality. Barring troubles in photographing, such as camera-shake, sufficiently satisfactory quality pictures for enjoyment by amateurs in daily life can be provided at a low price.
Along with advancement of age in the opulation constitution, advanced amateurs using high quality color negative films or silver halide color reversal photographic light sensitive materials (hereinafter, also denoted simply as color reversal photographic materials or color reversal films), which have been said to need to know how to use them, have increased opportunities for participating in a photography course, photography club or photography competition as a lifelong hobby. Accordingly, improved silver salt photographic materials with higher quality are continuously sought.
Similarly to professional photographers, such amateurs are often very critical in checking the quality of their finished images and are very insistent in their desire for creating their own works.
Such user's liking depends strongly on their individual insistence, so that photography goods satisfying the general public are needed, whereas providing a film characterized of specific performance is recognized as a commercial value. Accordingly, development of technical means for providing goods having such a high quality feature and practical use thereof are increasingly desired. Specifically, color reversal film is not only a recording medium for photographing but also has a display function, characterized in that various values can be easily added.
In cases when performing various characterization (value added) in color reversal films, from what view point designation is made is important, as well as improvements in graininess, sharpness and color reproduction as an imaging element. Studio photographs, for example, in which an object is relatively stable with respect to light amount and light quality are different in design concept from photographs taken at the seashore under the broiling sun.
Techniques for improving graininess, sharpness and color reproduction have been proposed, based on the concept of high added value being equal to high image quality. However, there is no proposal with respect to the potential is designed and in practice, a value added which meets concrete user's needs was not indicated.
As a technique for improving graininess, for example, is generally known a technique of making silver halide grains smaller, based on a technique for enhancing sensitivity of the grains. The use of tabular silver halide grains as a technique for enhancing sensitivity is described in U.S. Pat. Nos. 4,434,226, 4,439,520, 4,414,310, 4,433,048, 4,414,306 and 4,459,353; JP-A 58-111935, 58-111936, 58-111937, 580113927 and 59-99433 (herein, the term, JP-A means an unexamined and published Japanese Patent Application). Further, JP-A 63-220238 and Japanese Patent Application No. 10-009604 disclose a technique of introducing dislocation lines into the interior of silver halide grains.
However, nothing is described in these disclosures with respect to the concrete usage of the merit of enhanced graininess. With regard to sharpness, techniques of specifying the form or amount of silver halide grains contained in a photographic material or layer thickness of the photographic material, for example, including the use of tabular silver halide grains as described in the foregoing disclosures. Further, a large number of dyes have been proposed to enhance color reproduction and sharpness, for example, including azo dyes, oxonol dyes described in British Pat. No. 506,385 and JP-B 39-22069 (herein, the term, JP-B means a published Japanese Patent), merocyanine dyes described in U.S. Pat. No. 2,493,747 and styryl dyes described in U.S. Pat. No. 1,845,404.
There are also known diffusion-proof dyes used to dye a specific layer to enhance color reproducibility, including oil-soluble disperse dyes described in U.S. Pat. Nos. 2,538,008, 2,538,009, 4,420,555, 4,940,654; JP-A 61-204630, 61-205934, 62-32460, 62-56958, 62-92949, 62-222248, 63-40143, 63-184749, 63-316852, 1-179042, 3-75632, 3-109535, 3-144438, 3-179441, 4-362634, 5-53241, 5-86056, 5-209133, 5-289239, and 5-296848.
Methods for render a dye non-diffusible by using solid particles of a water-insoluble dye are also disclosed in WO88/4,794; U.S. Pat. Nos. 4,904,565 and 4,923,788; JP-A 63-197943, 64-40827, 1-155341, 1-172828, 2-1839, 2-110453, 3-23341, 3-206443, 3-216644, 3-216645, 3-216646, 3-217838, 3-231241, 4-37740, 4-37841, 4-44033, 4-116548, 4-296848, 5-197079 and 6-110155.
Recently, nature photography is becoming more and more popular in the increasing advanced-amateur class. Accordingly, design for color reversal film suitable for nature photography is becoming increasingly important. In regard to graininess, for example, although smoothness of flesh skin tone is desired, photographing opportunities of sky are markedly large so that it is expected that the desire for enhancing quality of the latter is potentially higher. It is further expected that potential demands for sharpness and color reproducibility suitable for nature photography are also high.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a silver halide color reversal photographic material suitable for nature photography.
It is an object of the invention to provide a color reversal photographic material improved in portrayal of the sky or greenish plant leaves as an important object of nature photography and perception of depth, e.g., that of overlapping leaves
The above objects can be accomplished by the following constitution:
1. A silver halide color reversal photographic material comprising a support having thereon 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 the granularity (expressed in a RMS value) at a density of 0.8 of the red-sensitive layer is within a range of 20 to 90% of the granularity (expressed in a RMS value) at a density of 0.8 of the green-sensitive layer;
2. A silver halide color reversal photographic material comprising a support having thereon 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 at least one of the light-sensitive layers exhibits the RMS value at a density of 0.8 within a range of 10 to 50% of the RMS value at a density of 1.6;
3. A silver halide color reversal photographic material comprising a support having thereon 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 the sharpness at a spatial frequency of 20 lines/mm in a low density region of the red-sensitive layer is within a range of 80 to 150% of the sharpness at a spatial frequency of 20 lines/mm in a low density region of the green-sensitive layer;
4. A silver halide color reversal photographic material comprising a support having thereon 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-sen
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Corporation
Letscher Geraldine
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