Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2001-09-17
2003-08-26
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S564000, C430S612000, C430S613000, C430S614000
Reexamination Certificate
active
06610467
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide emulsion having such characteristic as high sensitivity and high contrast, which are suitable for use for shooting. The present invention also relates to a silver halide color photographic light-sensitive material using the emulsion. Further, the present invention relates to a simple and rapid method for forming a color image by using the light-sensitive material.
Further, the present invention relates to a silver halide emulsion having high sensitivity and excellent characteristics exhibiting little change of gradation upon exposure to high-intensity illumination. The present invention also relates to a silver halide color photographic light-sensitive material using the emulsion. Further, the present invention relates to a simple and rapid color-image-forming process using the light-sensitive material.
BACKGROUND OF THE INVENTION
Owing to remarkable development of photographic light-sensitive materials utilizing silver halides, high-quality color images are now easily available. For example, ordinarily, according to so-called color photography, color prints are obtained by taking a photograph utilizing a color negative film, processing the film, and optically printing the image information that is recorded in the processed color negative film onto color printing paper. In recent years, this process has made remarkable progress, and large-scale, centralized color laboratories, in which a large quantity of color prints are produced high-efficiently, and the so-called mini labs, which are installed in shops and are designed to use compact and simple printer-processors, have spread widely. Therefore, anyone can enjoy color photography easily.
In addition, recently, a new-concept APS system, which uses a color negative film capable of recording various information as magnetic records by utilizing a support coated with a magnetic material, has been introduced into the market. This system proposes simplicity in handling films and photographic pleasure, such as capability to change the print size by recording information at the time photographs are taken. In addition, this system proposes a tool for compiling or processing images by reading out image information from a processed negative film by means of a simple scanner. Such methods enable high-quality image information of silver salt photographs to be digitized easily, and they are making the use of the image information commonplace beyond the traditional scope of enjoyment as photographs.
The color photography, now in common use, reproduces color by the subtractive color process. Generally, a color negative film comprises a transparent support and light-sensitive layers formed thereon utilizing silver halide emulsions as light-sensitive elements rendered sensitive to blue, green or red regions, respectively, and containing so-called color couplers capable of producing a yellow, magenta or cyan dye having a complementary hue in each light-sensitive layer. A color negative film image-wise exposed during photographing is processed in a color developing solution containing an aromatic primary amine developing agent. At this time, the developing agent develops, i.e., reduces, the exposed silver halide grains, and the oxidized product of the developing agent, which is formed concurrently with the foregoing reduction, undergoes a coupling reaction with the color coupler to form dyes. The metal silver (developed silver) generated by the development, and the unreacted silver halides, are removed through a bleaching process and a fixing process, respectively. As a result, a dye image is obtained. Subsequently, color photographic printing paper, which is a color light-sensitive material comprising a reflective support and light-sensitive layers coated thereon having a combination of light-sensitive wavelength regions and hues to be produced in each layer similar to that of the color negative film, is optically exposed to light through the processed color negative film. Then, the resultant paper is subjected to the color developing, bleaching and fixing processes, as in the case of the negative film, to obtain a color print having a color image composed of dye images, so that an original scene is reproduced.
In contrast with these classic image forming processes, recently it has been made possible to convert the image information recorded in a color negative to digital information, using a scanner, and to subject the digital information to various image treatments, so that the image quality of prints to be obtained is upgraded. Actually, a mini lab system having this technology has been made public.
Under this situation, as to the image forming process of color negatives, there is a growing demand for a simpler system.
On the other hand, so-called digital still cameras utilizing a CCD as an imaging element are making rapid progress. Cameras for amateurs which are mounted with a CCD element having millions or more of pixels have been put on the market for the past several years to obtain image qualities close to those of photographs. These digital still cameras save a step of developing the film taken, in contrast to usual color photographic systems, and they can produce directly digitized image information. Therefore, it can be made easy to confirm the image directly on a liquid crystal monitor when taking a photograph and to make use of the resulting digital information variously. The image information can be transferred to a printer to make a print readily, it can be variously processed using a personal computer, and it makes image transfer through an internet easy. Along with recent progresses in high density CCDs and in the abilities of equipment treating massive digital data, high quality images worth being appreciated as a photograph have come to be available. Discussion has been made on the possibilities of these digital still cameras being substituted for general photographing means.
In this situation, it is desired to further investigate the high sensitivity and high latitude possessed by silver halide light-sensitive materials with the view of further developing a silver salt photographic system in opposition to a digital still camera system. Although the performance of CCDs used as imaging elements of a digital still camera have been improved remarkably, there is a limitation on the provision of high sensitivity while increasing pixels in elements having a limited size. Also, it is basically difficult to impart high latitude under the restrictions imposed on an inexpensive and simple camera system. Hence, if silver halide light-sensitive materials with high sensitivity and latitude are attained and mounted on inexpensive and readily handlable products, e.g., films with a lens, a system attractive to customers will be provided.
In the meanwhile, it is an urgent problem to make it possible to carry out the developing step, which is a weak point of the silver halide light-sensitive material, more easily and rapidly. The strength of the digital still camera lies, after all, in the point that liquid development processing is not required. On the contrary, the development processing of the silver halide light-sensitive material needs private treating equipment and careful control and is hence utilized only in limited bases at present. This reason is as follows. The first reason for this is that expertise and skilled operation are necessary due to the requirement of strict control of the composition and the temperature of the solutions in processing baths for the above-mentioned procedure of color development, bleaching and fixation. The second reason is that equipment to be used exclusively for the developing process is often required, due to substances, contained in the processing solutions, such as color-developing agents and bleaching agents comprising an iron chelate compound and others the discharge of which is regulated from the standpoint of environmental protection. The third reason is that the currently available systems do not satisfactorily fulfill the r
Asami Masahiro
Kikuchi Makoto
Sato Tadanobu
LandOfFree
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